Merge branch 'phaser' into phaser2

* phaser: (127 commits)
  phaser: use misoc cordic
  phaser: fix DDS dummy cfg
  runtime: disable the Nagle algorithm entirely.
  runtime: buffer RPC send packets.
  runtime: don't print debug messages to the UART.
  runtime: print microsecond timestamps in debug messages.
  artiq_devtool: abort if build failed.
  conda: bump llvmlite-artiq dep.
  conda: bump llvmlite-artiq dep.
  llvm_ir_generator: use !{→unconditionally.}invariant.load metadata.
  artiq_devtool: more robust port forwarding.
  setup: remove paramiko dependency (optional and developer-only)
  artiq_devtool: implement.
  artiq_compile: actually disable attribute writeback.
  conda: use pythonparser 1.0.
  conda: tighten pythonparser dependency (fixes #600).
  doc: clarify kernel_invariant doc (fixes #609).
  compiler: Emit all-kernel_invariant objects as LLVM constants
  conda: update for LLVM 3.9.
  add has_dds, use config flags
  ...

MANIFEST.in

@@ -1,4 +1,5 @@
 graft artiq/runtime
+graft artiq/runtime.rs
 graft artiq/examples
 include artiq/gui/logo*.svg
 include versioneer.py

RELEASE_NOTES.rst

@@ -13,6 +13,9 @@ Release notes
 * Dynamic __getattr__'s returning RPC target methods are not supported anymore.
   Controller driver classes must define all their methods intended for RPC as
   members.
+* Datasets requested by experiments are by default archived into their HDF5
+  output. If this behavior is undesirable, turn it off by passing
+  ``archive=False`` to ``get_dataset``.
 
 
 2.0

artiq/browser/files.py

@@ -187,8 +187,16 @@ class FilesDock(QtWidgets.QDockWidget):
             except:
                 logger.warning("unable to read metadata from %s",
                                info.filePath(), exc_info=True)
+            rd = dict()
+            if "archive" in f:
+                rd = {k: (True, v.value) for k, v in f["archive"].items()}
             if "datasets" in f:
-                rd = {k: (True, v.value) for k, v in f["datasets"].items()}
+                for k, v in f["datasets"].items():
+                    if k in rd:
+                        logger.warning("dataset '%s' is both in archive and "
+                                       "outputs", k)
+                    rd[k] = (True, v.value)
+            if rd:
                 self.datasets.init(rd)
         self.dataset_changed.emit(info.filePath())
 

artiq/compiler/embedding.py

@@ -994,8 +994,24 @@ class Stitcher:
         else:
             assert False
 
+        is_async = False
+        if hasattr(host_function, "artiq_embedded") and \
+                "async" in host_function.artiq_embedded.flags:
+            is_async = True
+
+        if not builtins.is_none(ret_type) and is_async:
+            note = diagnostic.Diagnostic("note",
+                "function called here", {},
+                loc)
+            diag = diagnostic.Diagnostic("fatal",
+                "functions that return a value cannot be defined as async RPCs", {},
+                self._function_loc(host_function.artiq_embedded.function),
+                notes=[note])
+            self.engine.process(diag)
+
         function_type = types.TRPC(ret_type,
-                                   service=self.embedding_map.store_object(host_function))
+                                   service=self.embedding_map.store_object(host_function),
+                                   async=is_async)
         self.functions[function] = function_type
         return function_type
 
@@ -1007,7 +1023,11 @@ class Stitcher:
 
         if function in self.functions:
             pass
-        elif not hasattr(host_function, "artiq_embedded"):
+        elif not hasattr(host_function, "artiq_embedded") or \
+                (host_function.artiq_embedded.core_name is None and
+                 host_function.artiq_embedded.portable is False and
+                 host_function.artiq_embedded.syscall is None and
+                 host_function.artiq_embedded.forbidden is False):
             self._quote_rpc(function, loc)
         elif host_function.artiq_embedded.function is not None:
             if host_function.__name__ == "<lambda>":

artiq/compiler/module.py

@@ -40,7 +40,8 @@ class Source:
             return cls(source.Buffer(f.read(), filename, 1), engine=engine)
 
 class Module:
-    def __init__(self, src, ref_period=1e-6):
+    def __init__(self, src, ref_period=1e-6, attribute_writeback=True):
+        self.attribute_writeback = attribute_writeback
         self.engine = src.engine
         self.embedding_map = src.embedding_map
         self.name = src.name
@@ -79,14 +80,8 @@ class Module:
         llvm_ir_generator = transforms.LLVMIRGenerator(
             engine=self.engine, module_name=self.name, target=target,
             embedding_map=self.embedding_map)
-        return llvm_ir_generator.process(self.artiq_ir, attribute_writeback=True)
-
-    def entry_point(self):
-        """Return the name of the function that is the entry point of this module."""
-        if self.name != "":
-            return self.name + ".__modinit__"
-        else:
-            return "__modinit__"
+        return llvm_ir_generator.process(self.artiq_ir,
+            attribute_writeback=self.attribute_writeback)
 
     def __repr__(self):
         printer = types.TypePrinter()

artiq/compiler/prelude.py

@@ -31,6 +31,7 @@ def globals():
         # ARTIQ decorators
         "kernel":               builtins.fn_kernel(),
         "portable":             builtins.fn_kernel(),
+        "rpc":                  builtins.fn_kernel(),
 
         # ARTIQ context managers
         "parallel":             builtins.obj_parallel(),

artiq/compiler/targets.py

@@ -86,14 +86,11 @@ class Target:
         llmachine = lltarget.create_target_machine(
                         features=",".join(["+{}".format(f) for f in self.features]),
                         reloc="pic", codemodel="default")
-        llmachine.set_verbose(True)
+        llmachine.set_asm_verbosity(True)
         return llmachine
 
     def optimize(self, llmodule):
-        llmachine = self.target_machine()
         llpassmgr = llvm.create_module_pass_manager()
-        llmachine.target_data.add_pass(llpassmgr)
-        llmachine.add_analysis_passes(llpassmgr)
 
         # Register our alias analysis passes.
         llpassmgr.add_basic_alias_analysis_pass()
@@ -161,9 +158,9 @@ class Target:
 
         return llmachine.emit_object(llmodule)
 
-    def link(self, objects, init_fn):
+    def link(self, objects):
         """Link the relocatable objects into a shared library for this target."""
-        with RunTool([self.triple + "-ld", "-shared", "--eh-frame-hdr", "-init", init_fn] +
+        with RunTool([self.triple + "-ld", "-shared", "--eh-frame-hdr"] +
                      ["{{obj{}}}".format(index) for index in range(len(objects))] +
                      ["-o", "{output}"],
                      output=b"",
@@ -177,8 +174,7 @@ class Target:
             return library
 
     def compile_and_link(self, modules):
-        return self.link([self.assemble(self.compile(module)) for module in modules],
-                         init_fn=modules[0].entry_point())
+        return self.link([self.assemble(self.compile(module)) for module in modules])
 
     def strip(self, library):
         with RunTool([self.triple + "-strip", "--strip-debug", "{library}", "-o", "{output}"],

artiq/compiler/testbench/perf_embedding.py

@@ -47,7 +47,7 @@ def main():
     target = OR1KTarget()
     llvm_ir = target.compile(module)
     elf_obj = target.assemble(llvm_ir)
-    elf_shlib = target.link([elf_obj], init_fn=module.entry_point())
+    elf_shlib = target.link([elf_obj])
 
     benchmark(lambda: embed(),
               "ARTIQ embedding")
@@ -61,7 +61,7 @@ def main():
     benchmark(lambda: target.assemble(llvm_ir),
               "LLVM machine code emission")
 
-    benchmark(lambda: target.link([elf_obj], init_fn=module.entry_point()),
+    benchmark(lambda: target.link([elf_obj]),
               "Linking")
 
     benchmark(lambda: target.strip(elf_shlib),

artiq/compiler/transforms/artiq_ir_generator.py

@@ -452,6 +452,9 @@ class ARTIQIRGenerator(algorithm.Visitor):
             self.current_block = body
             self.visit(node.body)
             post_body = self.current_block
+        finally:
+            self.break_target = old_break
+            self.continue_target = old_continue
 
         if any(node.orelse):
             else_tail = self.add_block("while.else")
@@ -472,9 +475,6 @@ class ARTIQIRGenerator(algorithm.Visitor):
         if not post_body.is_terminated():
             post_body.append(ir.Branch(head))
         break_block.append(ir.Branch(tail))
-        finally:
-            self.break_target = old_break
-            self.continue_target = old_continue
 
     def iterable_len(self, value, typ=_size_type):
         if builtins.is_listish(value.type):
@@ -541,6 +541,9 @@ class ARTIQIRGenerator(algorithm.Visitor):
                 self.current_assign = None
             self.visit(node.body)
             post_body = self.current_block
+        finally:
+            self.break_target = old_break
+            self.continue_target = old_continue
 
         if any(node.orelse):
             else_tail = self.add_block("for.else")
@@ -564,9 +567,6 @@ class ARTIQIRGenerator(algorithm.Visitor):
         if not post_body.is_terminated():
             post_body.append(ir.Branch(continue_block))
         break_block.append(ir.Branch(tail))
-        finally:
-            self.break_target = old_break
-            self.continue_target = old_continue
 
     def visit_Break(self, node):
         self.append(ir.Branch(self.break_target))
@@ -821,7 +821,7 @@ class ARTIQIRGenerator(algorithm.Visitor):
                 timeout        = self.visit(context_expr_node.args[0])
                 timeout_ms     = self.append(ir.Arith(ast.Mult(loc=None), timeout,
                                                       ir.Constant(1000, builtins.TFloat())))
-                timeout_ms_int = self.append(ir.Coerce(timeout_ms, builtins.TInt32()))
+                timeout_ms_int = self.append(ir.Coerce(timeout_ms, builtins.TInt64()))
 
                 watchdog_id = self.append(ir.Builtin("watchdog_set", [timeout_ms_int],
                                                      builtins.TInt32()))

artiq/compiler/transforms/asttyped_rewriter.py

@@ -509,7 +509,7 @@ class ASTTypedRewriter(algorithm.Transformer):
     visit_DictComp = visit_unsupported
     visit_Ellipsis = visit_unsupported
     visit_GeneratorExp = visit_unsupported
-    visit_Set = visit_unsupported
+    # visit_Set = visit_unsupported
     visit_SetComp = visit_unsupported
     visit_Starred = visit_unsupported
     visit_Yield = visit_unsupported

artiq/compiler/transforms/llvm_ir_generator.py

@@ -19,6 +19,7 @@ lli32      = ll.IntType(32)
 lli64      = ll.IntType(64)
 lldouble   = ll.DoubleType()
 llptr      = ll.IntType(8).as_pointer()
+llptrptr   = ll.IntType(8).as_pointer().as_pointer()
 llmetadata = ll.MetaData()
 
 
@@ -36,9 +37,16 @@ def memoize(generator):
 class DebugInfoEmitter:
     def __init__(self, llmodule):
         self.llmodule = llmodule
-        self.llsubprograms = []
+        self.llcompileunit = None
         self.cache = {}
 
+        llident = self.llmodule.add_named_metadata('llvm.ident')
+        llident.add(self.emit_metadata(["ARTIQ"]))
+
+        llflags = self.llmodule.add_named_metadata('llvm.module.flags')
+        llflags.add(self.emit_metadata([2, "Debug Info Version", 3]))
+        llflags.add(self.emit_metadata([2, "Dwarf Version", 4]))
+
     def emit_metadata(self, operands):
         def map_operand(operand):
             if operand is None:
@@ -66,14 +74,13 @@ class DebugInfoEmitter:
         })
 
     @memoize
-    def emit_compile_unit(self, source_buffer, llsubprograms):
+    def emit_compile_unit(self, source_buffer):
         return self.emit_debug_info("DICompileUnit", {
             "language":        ll.DIToken("DW_LANG_Python"),
             "file":            self.emit_file(source_buffer),
             "producer":        "ARTIQ",
             "runtimeVersion":  0,
             "emissionKind":    2, # full=1, lines only=2
-            "subprograms":     self.emit_metadata(llsubprograms)
         }, is_distinct=True)
 
     @memoize
@@ -85,21 +92,26 @@ class DebugInfoEmitter:
     @memoize
     def emit_subprogram(self, func, llfunc):
         source_buffer = func.loc.source_buffer
+
+        if self.llcompileunit is None:
+            self.llcompileunit = self.emit_compile_unit(source_buffer)
+            llcompileunits = self.llmodule.add_named_metadata('llvm.dbg.cu')
+            llcompileunits.add(self.llcompileunit)
+
         display_name = "{}{}".format(func.name, types.TypePrinter().name(func.type))
-        llsubprogram = self.emit_debug_info("DISubprogram", {
+        return self.emit_debug_info("DISubprogram", {
             "name":            func.name,
             "linkageName":     llfunc.name,
             "type":            self.emit_subroutine_type(func.type),
             "file":            self.emit_file(source_buffer),
             "line":            func.loc.line(),
+            "unit":            self.llcompileunit,
             "scope":           self.emit_file(source_buffer),
             "scopeLine":       func.loc.line(),
             "isLocal":         func.is_internal,
             "isDefinition":    True,
             "variables":       self.emit_metadata([])
         }, is_distinct=True)
-        self.llsubprograms.append(llsubprogram)
-        return llsubprogram
 
     @memoize
     def emit_loc(self, loc, scope):
@@ -109,18 +121,6 @@ class DebugInfoEmitter:
             "scope":           scope
         })
 
-    def finalize(self, source_buffer):
-        llident = self.llmodule.add_named_metadata('llvm.ident')
-        llident.add(self.emit_metadata(["ARTIQ"]))
-
-        llflags = self.llmodule.add_named_metadata('llvm.module.flags')
-        llflags.add(self.emit_metadata([2, "Debug Info Version", 3]))
-        llflags.add(self.emit_metadata([2, "Dwarf Version", 4]))
-
-        llcompile_units = self.llmodule.add_named_metadata('llvm.dbg.cu')
-        llcompile_units.add(self.emit_compile_unit(source_buffer, tuple(self.llsubprograms)))
-
-
 class LLVMIRGenerator:
     def __init__(self, engine, module_name, target, embedding_map):
         self.engine = engine
@@ -349,14 +349,15 @@ class LLVMIRGenerator:
         elif name == "strcmp":
             llty = ll.FunctionType(lli32, [llptr, llptr])
         elif name == "send_rpc":
-            llty = ll.FunctionType(llvoid, [lli32, llptr],
-                                   var_arg=True)
+            llty = ll.FunctionType(llvoid, [lli32, llptr, llptrptr])
+        elif name == "send_async_rpc":
+            llty = ll.FunctionType(llvoid, [lli32, llptr, llptrptr])
         elif name == "recv_rpc":
             llty = ll.FunctionType(lli32, [llptr])
         elif name == "now":
             llty = lli64
         elif name == "watchdog_set":
-            llty = ll.FunctionType(lli32, [lli32])
+            llty = ll.FunctionType(lli32, [lli64])
         elif name == "watchdog_clear":
             llty = ll.FunctionType(llvoid, [lli32])
         else:
@@ -366,7 +367,8 @@ class LLVMIRGenerator:
             llglobal = ll.Function(self.llmodule, llty, name)
             if name in ("__artiq_raise", "__artiq_reraise", "llvm.trap"):
                 llglobal.attributes.add("noreturn")
-            if name in ("rtio_log", "send_rpc", "watchdog_set", "watchdog_clear",
+            if name in ("rtio_log", "send_rpc", "send_async_rpc",
+                        "watchdog_set", "watchdog_clear",
                         self.target.print_function):
                 llglobal.attributes.add("nounwind")
         else:
@@ -407,9 +409,6 @@ class LLVMIRGenerator:
         for func in functions:
             self.process_function(func)
 
-        if any(functions):
-            self.debug_info_emitter.finalize(functions[0].loc.source_buffer)
-
         if attribute_writeback and self.embedding_map is not None:
             self.emit_attribute_writeback()
 
@@ -652,7 +651,7 @@ class LLVMIRGenerator:
             llptr = self.llbuilder.gep(llenv, [self.llindex(0), self.llindex(outer_index)],
                                        inbounds=True)
             llouterenv = self.llbuilder.load(llptr)
-            llouterenv.set_metadata('invariant.load', self.empty_metadata)
+            llouterenv.set_metadata('unconditionally.invariant.load', self.empty_metadata)
             llouterenv.set_metadata('nonnull', self.empty_metadata)
             return self.llptr_to_var(llouterenv, env_ty.params["$outer"], var_name)
 
@@ -796,7 +795,7 @@ class LLVMIRGenerator:
                                            inbounds=True, name="ptr.{}".format(insn.name))
                 llvalue = self.llbuilder.load(llptr, name="val.{}".format(insn.name))
                 if types.is_instance(typ) and attr in typ.constant_attributes:
-                    llvalue.set_metadata('invariant.load', self.empty_metadata)
+                    llvalue.set_metadata('unconditionally.invariant.load', self.empty_metadata)
                 if isinstance(llvalue.type, ll.PointerType):
                     self.mark_dereferenceable(llvalue)
                 return llvalue
@@ -1051,7 +1050,7 @@ class LLVMIRGenerator:
                     llptr = self.llbuilder.gep(llenv, [self.llindex(0), self.llindex(outer_index)],
                                                inbounds=True)
                     llouterenv = self.llbuilder.load(llptr)
-                    llouterenv.set_metadata('invariant.load', self.empty_metadata)
+                    llouterenv.set_metadata('unconditionally.invariant.load', self.empty_metadata)
                     llouterenv.set_metadata('nonnull', self.empty_metadata)
                     return self.llptr_to_var(llouterenv, env_ty.params["$outer"], var_name)
                 else:
@@ -1233,7 +1232,8 @@ class LLVMIRGenerator:
         llstackptr = self.llbuilder.call(self.llbuiltin("llvm.stacksave"), [],
                                          name="rpc.stack")
 
-        llargs = []
+        llargs = self.llbuilder.alloca(llptr, ll.Constant(lli32, len(args)),
+                                       name="rpc.args")
         for index, arg in enumerate(args):
             if builtins.is_none(arg.type):
                 llargslot = self.llbuilder.alloca(ll.LiteralStructType([]),
@@ -1243,19 +1243,31 @@ class LLVMIRGenerator:
                 llargslot = self.llbuilder.alloca(llarg.type,
                                                   name="rpc.arg{}".format(index))
                 self.llbuilder.store(llarg, llargslot)
-            llargs.append(llargslot)
+            llargslot = self.llbuilder.bitcast(llargslot, llptr)
 
+            llargptr = self.llbuilder.gep(llargs, [ll.Constant(lli32, index)])
+            self.llbuilder.store(llargslot, llargptr)
+
+        if fun_type.async:
+            self.llbuilder.call(self.llbuiltin("send_async_rpc"),
+                                [llservice, lltag, llargs])
+        else:
             self.llbuilder.call(self.llbuiltin("send_rpc"),
-                            [llservice, lltag] + llargs)
+                                [llservice, lltag, llargs])
 
         # Don't waste stack space on saved arguments.
         self.llbuilder.call(self.llbuiltin("llvm.stackrestore"), [llstackptr])
 
+        if fun_type.async:
+            return ll.Undefined
+
         # T result = {
-        #   void *ptr = NULL;
-        #   loop: int size = rpc_recv("tag", ptr);
+        #   void *ret_ptr = alloca(sizeof(T));
+        #   void *ptr = ret_ptr;
+        #   loop: int size = recv_rpc(ptr);
+        #   // Non-zero: Provide `size` bytes of extra storage for variable-length data.
         #   if(size) { ptr = alloca(size); goto loop; }
-        #   else *(T*)ptr
+        #   else *(T*)ret_ptr
         # }
         llprehead   = self.llbuilder.basic_block
         llhead      = self.llbuilder.append_basic_block(name="rpc.head")
@@ -1270,7 +1282,7 @@ class LLVMIRGenerator:
         self.llbuilder.branch(llhead)
 
         self.llbuilder.position_at_end(llhead)
-        llphi = self.llbuilder.phi(llslotgen.type, name="rpc.size")
+        llphi = self.llbuilder.phi(llslotgen.type, name="rpc.ptr")
         llphi.add_incoming(llslotgen, llprehead)
         if llunwindblock:
             llsize = self.llbuilder.invoke(self.llbuiltin("recv_rpc"), [llphi],
@@ -1286,6 +1298,7 @@ class LLVMIRGenerator:
 
         self.llbuilder.position_at_end(llalloc)
         llalloca = self.llbuilder.alloca(lli8, llsize, name="rpc.alloc")
+        llalloca.align = 4 # maximum alignment required by OR1K ABI
         llphi.add_incoming(llalloca, llalloc)
         self.llbuilder.branch(llhead)
 
@@ -1371,6 +1384,7 @@ class LLVMIRGenerator:
         def _quote_attributes():
             llglobal = None
             llfields = []
+            emit_as_constant = True
             for attr in typ.attributes:
                 if attr == "__objectid__":
                     objectid = self.embedding_map.store_object(value)
@@ -1391,6 +1405,8 @@ class LLVMIRGenerator:
                                          not types.is_c_function(typ.attributes[attr]))
                     if is_class_function:
                         attrvalue = self.embedding_map.specialize_function(typ.instance, attrvalue)
+                    if not (types.is_instance(typ) and attr in typ.constant_attributes):
+                        emit_as_constant = False
                     llattrvalue = self._quote(attrvalue, typ.attributes[attr],
                                               lambda: path() + [attr])
                     llfields.append(llattrvalue)
@@ -1398,6 +1414,7 @@ class LLVMIRGenerator:
                         llclosureptr = self.get_global_closure_ptr(typ, attr)
                         llclosureptr.initializer = llattrvalue
 
+            llglobal.global_constant = emit_as_constant
             llglobal.initializer = ll.Constant(llty.pointee, llfields)
             llglobal.linkage = "private"
             return llglobal

artiq/compiler/types.py

@@ -308,20 +308,22 @@ class TRPC(Type):
     :ivar ret: (:class:`Type`)
         return type
     :ivar service: (int) RPC service number
+    :ivar async: (bool) whether the RPC blocks until return
     """
 
     attributes = OrderedDict()
 
-    def __init__(self, ret, service):
+    def __init__(self, ret, service, async=False):
         assert isinstance(ret, Type)
-        self.ret, self.service = ret, service
+        self.ret, self.service, self.async = ret, service, async
 
     def find(self):
         return self
 
     def unify(self, other):
         if isinstance(other, TRPC) and \
-                self.service == other.service:
+                self.service == other.service and \
+                self.async == other.async:
             self.ret.unify(other.ret)
         elif isinstance(other, TVar):
             other.unify(self)
@@ -337,7 +339,8 @@ class TRPC(Type):
 
     def __eq__(self, other):
         return isinstance(other, TRPC) and \
-                self.service == other.service
+                self.service == other.service and \
+                self.async == other.async
 
     def __ne__(self, other):
         return not (self == other)
@@ -727,7 +730,9 @@ class TypePrinter(object):
             elif isinstance(typ, TFunction):
                 return signature
         elif isinstance(typ, TRPC):
-            return "[rpc #{}](...)->{}".format(typ.service, self.name(typ.ret, depth + 1))
+            return "[rpc{} #{}](...)->{}".format(typ.service,
+                                                 " async" if typ.async else "",
+                                                 self.name(typ.ret, depth + 1))
         elif isinstance(typ, TBuiltinFunction):
             return "<function {}>".format(typ.name)
         elif isinstance(typ, (TConstructor, TExceptionConstructor)):

artiq/coredevice/comm_generic.py

@@ -20,7 +20,7 @@ class _H2DMsgType(Enum):
     IDENT_REQUEST = 3
     SWITCH_CLOCK = 4
 
-    LOAD_LIBRARY = 5
+    LOAD_KERNEL = 5
     RUN_KERNEL = 6
 
     RPC_REPLY = 7
@@ -68,9 +68,7 @@ RPCKeyword = namedtuple('RPCKeyword', ['name', 'value'])
 
 class CommGeneric:
     def __init__(self):
-        self._read_type = self._write_type = None
-        self._read_length = 0
-        self._write_buffer = []
+        self._read_type = None
 
     def open(self):
         """Opens the communication channel.
@@ -99,10 +97,6 @@ class CommGeneric:
     def _read_header(self):
         self.open()
 
-        if self._read_length > 0:
-            raise IOError("Read underrun ({} bytes remaining)".
-                          format(self._read_length))
-
         # Wait for a synchronization sequence, 5a 5a 5a 5a.
         sync_count = 0
         while sync_count < 4:
@@ -113,20 +107,11 @@ class CommGeneric:
                 sync_count = 0
 
         # Read message header.
-        (self._read_length, ) = struct.unpack(">l", self.read(4))
-        if not self._read_length:  # inband connection close
-            raise OSError("Connection closed")
-
         (raw_type, ) = struct.unpack("B", self.read(1))
         self._read_type = _D2HMsgType(raw_type)
 
-        if self._read_length < 9:
-            raise IOError("Read overrun in message header ({} remaining)".
-                          format(self._read_length))
-        self._read_length -= 9
-
-        logger.debug("receiving message: type=%r length=%d",
-                     self._read_type, self._read_length)
+        logger.debug("receiving message: type=%r",
+                     self._read_type)
 
     def _read_expect(self, ty):
         if self._read_type != ty:
@@ -138,12 +123,6 @@ class CommGeneric:
         self._read_expect(ty)
 
     def _read_chunk(self, length):
-        if self._read_length < length:
-            raise IOError("Read overrun while trying to read {} bytes ({} remaining)"
-                          " in packet {}".
-                          format(length, self._read_length, self._read_type))
-
-        self._read_length -= length
         return self.read(length)
 
     def _read_int8(self):
@@ -162,11 +141,14 @@ class CommGeneric:
         (value, ) = struct.unpack(">d", self._read_chunk(8))
         return value
 
+    def _read_bool(self):
+        return True if self._read_int8() else False
+
     def _read_bytes(self):
         return self._read_chunk(self._read_int32())
 
     def _read_string(self):
-        return self._read_bytes()[:-1].decode("utf-8")
+        return self._read_bytes().decode("utf-8")
 
     #
     # Writer interface
@@ -175,46 +157,38 @@ class CommGeneric:
     def _write_header(self, ty):
         self.open()
 
-        logger.debug("preparing to send message: type=%r", ty)
-        self._write_type   = ty
-        self._write_buffer = []
+        logger.debug("sending message: type=%r", ty)
 
-    def _write_flush(self):
-        # Calculate message size.
-        length = sum([len(chunk) for chunk in self._write_buffer])
-        logger.debug("sending message: type=%r length=%d", self._write_type, length)
-
-        # Write synchronization sequence, header and body.
-        self.write(struct.pack(">llB", 0x5a5a5a5a,
-                                       9 + length, self._write_type.value))
-        for chunk in self._write_buffer:
-            self.write(chunk)
+        # Write synchronization sequence and header.
+        self.write(struct.pack(">lB", 0x5a5a5a5a, ty.value))
 
     def _write_empty(self, ty):
         self._write_header(ty)
-        self._write_flush()
 
     def _write_chunk(self, chunk):
-        self._write_buffer.append(chunk)
+        self.write(chunk)
 
     def _write_int8(self, value):
-        self._write_buffer.append(struct.pack("B", value))
+        self.write(struct.pack("B", value))
 
     def _write_int32(self, value):
-        self._write_buffer.append(struct.pack(">l", value))
+        self.write(struct.pack(">l", value))
 
     def _write_int64(self, value):
-        self._write_buffer.append(struct.pack(">q", value))
+        self.write(struct.pack(">q", value))
 
     def _write_float64(self, value):
-        self._write_buffer.append(struct.pack(">d", value))
+        self.write(struct.pack(">d", value))
+
+    def _write_bool(self, value):
+        self.write(struct.pack("B", value))
 
     def _write_bytes(self, value):
         self._write_int32(len(value))
-        self._write_buffer.append(value)
+        self.write(value)
 
     def _write_string(self, value):
-        self._write_bytes(value.encode("utf-8") + b"\0")
+        self._write_bytes(value.encode("utf-8"))
 
     #
     # Exported APIs
@@ -232,7 +206,7 @@ class CommGeneric:
         if runtime_id != b"AROR":
             raise UnsupportedDevice("Unsupported runtime ID: {}"
                                     .format(runtime_id))
-        gateware_version = self._read_chunk(self._read_length).decode("utf-8")
+        gateware_version = self._read_string()
         if gateware_version != software_version and \
                 gateware_version + ".dirty" != software_version:
             logger.warning("Mismatch between gateware (%s) "
@@ -242,7 +216,6 @@ class CommGeneric:
     def switch_clock(self, external):
         self._write_header(_H2DMsgType.SWITCH_CLOCK)
         self._write_int8(external)
-        self._write_flush()
 
         self._read_empty(_D2HMsgType.CLOCK_SWITCH_COMPLETED)
 
@@ -251,7 +224,7 @@ class CommGeneric:
 
         self._read_header()
         self._read_expect(_D2HMsgType.LOG_REPLY)
-        return self._read_chunk(self._read_length).decode("utf-8", "replace")
+        return self._read_string()
 
     def clear_log(self):
         self._write_empty(_H2DMsgType.LOG_CLEAR)
@@ -261,17 +234,15 @@ class CommGeneric:
     def flash_storage_read(self, key):
         self._write_header(_H2DMsgType.FLASH_READ_REQUEST)
         self._write_string(key)
-        self._write_flush()
 
         self._read_header()
         self._read_expect(_D2HMsgType.FLASH_READ_REPLY)
-        return self._read_chunk(self._read_length)
+        return self._read_string()
 
     def flash_storage_write(self, key, value):
         self._write_header(_H2DMsgType.FLASH_WRITE_REQUEST)
         self._write_string(key)
         self._write_bytes(value)
-        self._write_flush()
 
         self._read_header()
         if self._read_type == _D2HMsgType.FLASH_ERROR_REPLY:
@@ -287,14 +258,12 @@ class CommGeneric:
     def flash_storage_remove(self, key):
         self._write_header(_H2DMsgType.FLASH_REMOVE_REQUEST)
         self._write_string(key)
-        self._write_flush()
 
         self._read_empty(_D2HMsgType.FLASH_OK_REPLY)
 
     def load(self, kernel_library):
-        self._write_header(_H2DMsgType.LOAD_LIBRARY)
-        self._write_chunk(kernel_library)
-        self._write_flush()
+        self._write_header(_H2DMsgType.LOAD_KERNEL)
+        self._write_bytes(kernel_library)
 
         self._read_empty(_D2HMsgType.LOAD_COMPLETED)
 
@@ -442,25 +411,29 @@ class CommGeneric:
             raise IOError("Unknown RPC value tag: {}".format(repr(tag)))
 
     def _serve_rpc(self, embedding_map):
+        async        = self._read_bool()
         service_id   = self._read_int32()
-        if service_id == 0:
+        args, kwargs = self._receive_rpc_args(embedding_map)
+        return_tags  = self._read_bytes()
+
+        if service_id is 0:
             service  = lambda obj, attr, value: setattr(obj, attr, value)
         else:
             service  = embedding_map.retrieve_object(service_id)
+        logger.debug("rpc service: [%d]%r%s %r %r -> %s", service_id, service,
+                     (" (async)" if async else ""), args, kwargs, return_tags)
 
-        args, kwargs = self._receive_rpc_args(embedding_map)
-        return_tags  = self._read_bytes()
-        logger.debug("rpc service: [%d]%r %r %r -> %s", service_id, service, args, kwargs, return_tags)
+        if async:
+            service(*args, **kwargs)
+            return
 
         try:
             result = service(*args, **kwargs)
-            logger.debug("rpc service: %d %r %r == %r", service_id, args, kwargs, result)
+            logger.debug("rpc service: %d %r %r = %r", service_id, args, kwargs, result)
 
-            if service_id != 0:
             self._write_header(_H2DMsgType.RPC_REPLY)
             self._write_bytes(return_tags)
             self._send_rpc_value(bytearray(return_tags), result, result, service)
-                self._write_flush()
         except Exception as exn:
             logger.debug("rpc service: %d %r %r ! %r", service_id, args, kwargs, exn)
 
@@ -503,8 +476,6 @@ class CommGeneric:
                 self._write_int32(-1) # column not known
                 self._write_string(function)
 
-            self._write_flush()
-
     def _serve_exception(self, embedding_map, symbolizer, demangler):
         name      = self._read_string()
         message   = self._read_string()

artiq/coredevice/comm_tcp.py

@@ -29,7 +29,6 @@ def initialize_connection(host, port):
     sock.settimeout(None)
     set_keepalive(sock, 3, 2, 3)
     logger.debug("connected to host %s on port %d", host, port)
-    sock.sendall(b"ARTIQ coredev\n")
     return sock
 
 
@@ -44,6 +43,7 @@ class Comm(CommGeneric):
         if hasattr(self, "socket"):
             return
         self.socket = initialize_connection(self.host, self.port)
+        self.socket.sendall(b"ARTIQ coredev\n")
 
     def close(self):
         if not hasattr(self, "socket"):

artiq/coredevice/core.py

@@ -81,7 +81,7 @@ class Core:
         self.core = self
         self.comm.core = self
 
-    def compile(self, function, args, kwargs, set_result=None, with_attr_writeback=True):
+    def compile(self, function, args, kwargs, set_result=None, attribute_writeback=True):
         try:
             engine = _DiagnosticEngine(all_errors_are_fatal=True)
 
@@ -89,7 +89,9 @@ class Core:
             stitcher.stitch_call(function, args, kwargs, set_result)
             stitcher.finalize()
 
-            module = Module(stitcher, ref_period=self.ref_period)
+            module = Module(stitcher,
+                ref_period=self.ref_period,
+                attribute_writeback=attribute_writeback)
             target = OR1KTarget()
 
             library = target.compile_and_link([module])
@@ -103,6 +105,7 @@ class Core:
 
     def run(self, function, args, kwargs):
         result = None
+        @rpc(flags={"async"})
         def set_result(new_result):
             nonlocal result
             result = new_result

artiq/dashboard/datasets.py

@@ -7,6 +7,7 @@ from PyQt5 import QtCore, QtWidgets
 from artiq.tools import short_format
 from artiq.gui.tools import LayoutWidget, QRecursiveFilterProxyModel
 from artiq.gui.models import DictSyncTreeSepModel
+from artiq.gui.scientific_spinbox import ScientificSpinBox
 
 
 logger = logging.getLogger(__name__)
@@ -50,10 +51,10 @@ class Editor(QtWidgets.QDialog):
 
 class NumberEditor(Editor):
     def get_edit_widget(self, initial_value):
-        self.edit_widget = QtWidgets.QDoubleSpinBox()
-        self.edit_widget.setMinimum(float("-inf"))
-        self.edit_widget.setMaximum(float("+inf"))
-        self.edit_widget.setDecimals(8)
+        self.edit_widget = ScientificSpinBox()
+        self.edit_widget.setDecimals(13)
+        self.edit_widget.setPrecision()
+        self.edit_widget.setRelativeStep()
         self.edit_widget.setValue(float(initial_value))
         return self.edit_widget
 

artiq/dashboard/moninj.py

@@ -23,35 +23,26 @@ _mode_enc = {
 }
 
 
-class _MoninjWidget(QtWidgets.QFrame):
-    def __init__(self):
-        QtWidgets.QFrame.__init__(self)
-        qfm = QtGui.QFontMetrics(self.font())
-        self._size = QtCore.QSize(
-            18*qfm.averageCharWidth(),
-            6*qfm.lineSpacing())
-        self.setSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
-
-        self.setFrameShape(QtWidgets.QFrame.Box)
-        self.setFrameShadow(QtWidgets.QFrame.Raised)
-
-    def sizeHint(self):
-        return self._size
-
-
-class _TTLWidget(_MoninjWidget):
+class _TTLWidget(QtWidgets.QFrame):
     def __init__(self, channel, send_to_device, force_out, title):
+        QtWidgets.QFrame.__init__(self)
+
         self.channel = channel
         self.send_to_device = send_to_device
         self.force_out = force_out
 
-        _MoninjWidget.__init__(self)
+        self.setFrameShape(QtWidgets.QFrame.Box)
+        self.setFrameShadow(QtWidgets.QFrame.Raised)
 
         grid = QtWidgets.QGridLayout()
+        grid.setContentsMargins(0, 0, 0, 0)
+        grid.setHorizontalSpacing(0)
+        grid.setVerticalSpacing(0)
         self.setLayout(grid)
         label = QtWidgets.QLabel(title)
         label.setAlignment(QtCore.Qt.AlignCenter)
-        label.setWordWrap(True)
+        label.setSizePolicy(QtWidgets.QSizePolicy.Ignored,
+                            QtWidgets.QSizePolicy.Preferred)
         grid.addWidget(label, 1, 1)
 
         self.stack = QtWidgets.QStackedWidget()
@@ -62,9 +53,18 @@ class _TTLWidget(_MoninjWidget):
         self.stack.addWidget(self.direction)
 
         grid_cb = LayoutWidget()
-        self.override = QtWidgets.QCheckBox("Override")
+        grid_cb.layout.setContentsMargins(0, 0, 0, 0)
+        grid_cb.layout.setHorizontalSpacing(0)
+        grid_cb.layout.setVerticalSpacing(0)
+        self.override = QtWidgets.QToolButton()
+        self.override.setText("OVR")
+        self.override.setCheckable(True)
+        self.override.setToolTip("Override")
         grid_cb.addWidget(self.override, 3, 1)
-        self.level = QtWidgets.QCheckBox("Level")
+        self.level = QtWidgets.QToolButton()
+        self.level.setText("LVL")
+        self.level.setCheckable(True)
+        self.level.setToolTip("Level")
         grid_cb.addWidget(self.level, 3, 2)
         self.stack.addWidget(grid_cb)
 
@@ -78,19 +78,19 @@ class _TTLWidget(_MoninjWidget):
         grid.setRowStretch(4, 1)
 
         self.programmatic_change = False
-        self.override.stateChanged.connect(self.override_toggled)
-        self.level.stateChanged.connect(self.level_toggled)
+        self.override.clicked.connect(self.override_toggled)
+        self.level.clicked.connect(self.level_toggled)
 
         self.set_value(0, False, False)
 
     def enterEvent(self, event):
         self.stack.setCurrentIndex(1)
-        _MoninjWidget.enterEvent(self, event)
+        QtWidgets.QFrame.enterEvent(self, event)
 
     def leaveEvent(self, event):
         if not self.override.isChecked():
             self.stack.setCurrentIndex(0)
-        _MoninjWidget.leaveEvent(self, event)
+        QtWidgets.QFrame.leaveEvent(self, event)
 
     def override_toggled(self, override):
         if self.programmatic_change:
@@ -125,11 +125,11 @@ class _TTLWidget(_MoninjWidget):
             color = " color=\"red\""
         else:
             color = ""
-        self.value.setText("<font size=\"9\"{}>{}</font>".format(
+        self.value.setText("<font size=\"5\"{}>{}</font>".format(
                             color, value_s))
         oe = oe or self.force_out
         direction = "OUT" if oe else "IN"
-        self.direction.setText("<font size=\"1\">" + direction + "</font>")
+        self.direction.setText("<font size=\"2\">" + direction + "</font>")
 
         self.programmatic_change = True
         try:
@@ -144,24 +144,30 @@ class _TTLWidget(_MoninjWidget):
         return self.channel
 
 
-class _DDSWidget(_MoninjWidget):
+class _DDSWidget(QtWidgets.QFrame):
     def __init__(self, bus_channel, channel, sysclk, title):
+        QtWidgets.QFrame.__init__(self)
+
         self.bus_channel = bus_channel
         self.channel = channel
         self.sysclk = sysclk
 
-        _MoninjWidget.__init__(self)
+        self.setFrameShape(QtWidgets.QFrame.Box)
+        self.setFrameShadow(QtWidgets.QFrame.Raised)
 
         grid = QtWidgets.QGridLayout()
+        grid.setContentsMargins(0, 0, 0, 0)
+        grid.setHorizontalSpacing(0)
+        grid.setVerticalSpacing(0)
         self.setLayout(grid)
         label = QtWidgets.QLabel(title)
         label.setAlignment(QtCore.Qt.AlignCenter)
-        label.setWordWrap(True)
+        label.setSizePolicy(QtWidgets.QSizePolicy.Ignored,
+                    QtWidgets.QSizePolicy.Preferred)
         grid.addWidget(label, 1, 1)
 
         self.value = QtWidgets.QLabel()
         self.value.setAlignment(QtCore.Qt.AlignCenter)
-        self.value.setWordWrap(True)
         grid.addWidget(self.value, 2, 1, 6, 1)
 
         grid.setRowStretch(1, 1)
@@ -172,7 +178,7 @@ class _DDSWidget(_MoninjWidget):
 
     def set_value(self, ftw):
         frequency = ftw*self.sysclk()/2**32
-        self.value.setText("<font size=\"5\">{:.7f} MHz</font>"
+        self.value.setText("<font size=\"4\">{:.7f}</font><font size=\"2\"> MHz</font>"
                            .format(frequency/1e6))
 
     def sort_key(self):

artiq/devices/pdq2/driver.py

@@ -13,6 +13,17 @@ logger = logging.getLogger(__name__)
 
 
 class Segment:
+    """Serialize the lines for a single Segment.
+
+    Attributes:
+        max_time (int): Maximum duration of a line.
+        max_val (int): Maximum absolute value (scale) of the DAC output.
+        max_out (float): Output voltage at :attr:`max_val`. In Volt.
+        out_scale (float): Steps per Volt.
+        cordic_gain (float): CORDIC amplitude gain.
+        addr (int): Address assigned to this segment.
+        data (bytes): Serialized segment data.
+    """
     max_time = 1 << 16  # uint16 timer
     max_val = 1 << 15  # int16 DAC
     max_out = 10.  # Volt
@@ -27,6 +38,24 @@ class Segment:
 
     def line(self, typ, duration, data, trigger=False, silence=False,
              aux=False, shift=0, jump=False, clear=False, wait=False):
+        """Append a line to this segment.
+
+        Args:
+            typ (int): Output module to target with this line.
+            duration (int): Duration of the line in units of
+                ``clock_period*2**shift``.
+            data (bytes): Opaque data for the output module.
+            trigger (bool): Wait for trigger assertion before executing
+                this line.
+            silence (bool): Disable DAC clocks for the duration of this line.
+            aux (bool): Assert the AUX (F5 TTL) output during this line.
+            shift (int): Duration and spline evolution exponent.
+            jump (bool): Return to the frame address table after this line.
+            clear (bool): Clear the DDS phase accumulator when starting to
+                exectute this line.
+            wait (bool): Wait for trigger assertion before executing the next
+                line.
+        """
         assert len(data) % 2 == 0, data
         assert len(data)//2 <= 14
         # assert dt*(1 << shift) > 1 + len(data)//2
@@ -39,6 +68,15 @@ class Segment:
 
     @staticmethod
     def pack(widths, values):
+        """Pack spline data.
+
+        Args:
+            widths (list[int]): Widths of values in multiples of 16 bits.
+            values (list[int]): Values to pack.
+
+        Returns:
+            data (bytes): Packed data.
+        """
         fmt = "<"
         ud = []
         for width, value in zip(widths, values):
@@ -60,7 +98,11 @@ class Segment:
     def bias(self, amplitude=[], **kwargs):
         """Append a bias line to this segment.
 
-        Amplitude in volts
+        Args:
+            amplitude (list[float]): Amplitude coefficients in in Volts and
+                increasing powers of ``1/(2**shift*clock_period)``.
+                Discrete time compensation will be applied.
+            **kwargs: Passed to :meth:`line`.
         """
         coef = [self.out_scale*a for a in amplitude]
         discrete_compensate(coef)
@@ -68,12 +110,18 @@ class Segment:
         self.line(typ=0, data=data, **kwargs)
 
     def dds(self, amplitude=[], phase=[], **kwargs):
-        """Append a dds line to this segment.
+        """Append a DDS line to this segment.
 
-        Amplitude in volts,
-        phase[0] in turns,
-        phase[1] in turns*sample_rate,
-        phase[2] in turns*(sample_rate/2**shift)**2
+        Args:
+            amplitude (list[float]): Amplitude coefficients in in Volts and
+                increasing powers of ``1/(2**shift*clock_period)``.
+                Discrete time compensation and CORDIC gain compensation
+                will be applied by this method.
+            phase (list[float]): Phase/frequency/chirp coefficients.
+                ``phase[0]`` in ``turns``,
+                ``phase[1]`` in ``turns/clock_period``,
+                ``phase[2]`` in ``turns/(clock_period**2*2**shift)``.
+            **kwargs: Passed to :meth:`line`.
         """
         scale = self.out_scale/self.cordic_gain
         coef = [scale*a for a in amplitude]
@@ -86,6 +134,13 @@ class Segment:
 
 
 class Channel:
+    """PDQ2 Channel.
+
+    Attributes:
+        num_frames (int): Number of frames supported.
+        max_data (int): Number of 16 bit data words per channel.
+        segments (list[Segment]): Segments added to this channel.
+    """
     num_frames = 8
     max_data = 4*(1 << 10)  # 8kx16 8kx16 4kx16
 
@@ -93,14 +148,27 @@ class Channel:
         self.segments = []
 
     def clear(self):
+        """Remove all segments."""
         self.segments.clear()
 
     def new_segment(self):
+        """Create and attach a new :class:`Segment` to this channel.
+
+        Returns:
+            :class:`Segment`
+        """
         segment = Segment()
         self.segments.append(segment)
         return segment
 
     def place(self):
+        """Place segments contiguously.
+
+        Assign segment start addresses and determine length of data.
+
+        Returns:
+            addr (int): Amount of memory in use on this channel.
+        """
         addr = self.num_frames
         for segment in self.segments:
             segment.addr = addr
@@ -109,6 +177,23 @@ class Channel:
         return addr
 
     def table(self, entry=None):
+        """Generate the frame address table.
+
+        Unused frame indices are assigned the zero address in the frame address
+        table.
+        This will cause the memory parser to remain in the frame address table
+        until another frame is selected.
+
+        The frame entry segments can be any segments in the channel.
+
+        Args:
+            entry (list[Segment]): List of initial segments for each frame.
+                If not specified, the first :attr:`num_frames` segments are
+                used as frame entry points.
+
+        Returns:
+            table (bytes): Frame address table.
+        """
         table = [0] * self.num_frames
         if entry is None:
             entry = self.segments
@@ -118,6 +203,18 @@ class Channel:
         return struct.pack("<" + "H"*self.num_frames, *table)
 
     def serialize(self, entry=None):
+        """Serialize the memory for this channel.
+
+        Places the segments contiguously in memory after the frame table.
+        Allocates and assigns segment and frame table addresses.
+        Serializes segment data and prepends frame address table.
+
+        Args:
+            entry (list[Segment]): See :meth:`table`.
+
+        Returns:
+            data (bytes): Channel memory data.
+        """
         self.place()
         data = b"".join([segment.data for segment in self.segments])
         return self.table(entry) + data
@@ -125,7 +222,22 @@ class Channel:
 
 class Pdq2:
     """
-    PDQ DAC (a.k.a. QC_Waveform)
+    PDQ stack.
+
+    Args:
+        url (str): Pyserial device URL. Can be ``hwgrep://`` style
+            (search for serial number, bus topology, USB VID:PID combination),
+            ``COM15`` for a Windows COM port number,
+            ``/dev/ttyUSB0`` for a Linux serial port.
+        dev (file-like): File handle to use as device. If passed, ``url`` is
+            ignored.
+        num_boards (int): Number of boards in this stack.
+
+    Attributes:
+        num_dacs (int): Number of DAC outputs per board.
+        num_channels (int): Number of channels in this stack.
+        num_boards (int): Number of boards in this stack.
+        channels (list[Channel]): List of :class:`Channel` in this stack.
     """
     num_dacs = 3
     freq = 50e6
@@ -154,42 +266,58 @@ class Pdq2:
         self.freq = float(freq)
 
     def close(self):
+        """Close the USB device handle."""
         self.dev.close()
         del self.dev
 
     def write(self, data):
+        """Write data to the PDQ2 board.
+
+        Args:
+            data (bytes): Data to write.
+        """
         logger.debug("> %r", data)
         written = self.dev.write(data)
         if isinstance(written, int):
             assert written == len(data)
 
     def cmd(self, cmd, enable):
+        """Execute a command.
+
+        Args:
+            cmd (str): Command to execute. One of (``RESET``, ``TRIGGER``,
+                ``ARM``, ``DCM``, ``START``).
+            enable (bool): Enable (``True``) or disable (``False``) the
+                feature.
+        """
         cmd = self._commands.index(cmd) << 1
         if not enable:
             cmd |= 1
         self.write(struct.pack("cb", self._escape, cmd))
 
     def write_mem(self, channel, data, start_addr=0):
+        """Write to channel memory.
+
+        Args:
+            channel (int): Channel index to write to. Assumes every board in
+                the stack has :attr:`num_dacs` DAC outputs.
+            data (bytes): Data to write to memory.
+            start_addr (int): Start address to write data to.
+        """
         board, dac = divmod(channel, self.num_dacs)
         data = struct.pack("<HHH", (board << 4) | dac, start_addr,
                            start_addr + len(data)//2 - 1) + data
         data = data.replace(self._escape, self._escape + self._escape)
         self.write(data)
 
-    def flush(self):
-        self.dev.flush()
-
-    def park(self):
-        self.cmd("START", False)
-        self.cmd("TRIGGER", True)
-        self.flush()
-
-    def unpark(self):
-        self.cmd("TRIGGER", False)
-        self.cmd("START", True)
-        self.flush()
-
     def program_segments(self, segments, data):
+        """Append the wavesynth lines to the given segments.
+
+        Args:
+            segments (list[Segment]): List of :class:`Segment` to append the
+                lines to.
+            data (list): List of wavesynth lines.
+        """
         for i, line in enumerate(data):
             dac_divider = line.get("dac_divider", 1)
             shift = int(log(dac_divider, 2))
@@ -208,6 +336,25 @@ class Pdq2:
                         silence=silence, **target_data)
 
     def program(self, program, channels=None):
+        """Serialize a wavesynth program and write it to the channels
+        in the stack.
+
+        The :class:`Channel` targeted are cleared and each frame in the
+        wavesynth program is appended to a fresh set of :class:`Segment`
+        of the channels. All segments are allocated, the frame address tale
+        is generated, the channels are serialized and their memories are
+        written.
+
+        Short single-cycle lines are prepended and appended to each frame to
+        allow proper write interlocking and to assure that the memory reader
+        can be reliably parked in the frame address table.
+        The first line of each frame is mandatorily triggered.
+
+        Args:
+            program (list): Wavesynth program to serialize.
+            channels (list[int]): Channel indices to use. If unspecified, all
+                channels are used.
+        """
         if channels is None:
             channels = range(self.num_channels)
         chs = [self.channels[i] for i in channels]
@@ -225,5 +372,18 @@ class Pdq2:
         for channel, ch in zip(channels, chs):
             self.write_mem(channel, ch.serialize())
 
+    def flush(self):
+        self.dev.flush()
+
+    def park(self):
+        self.cmd("START", False)
+        self.cmd("TRIGGER", True)
+        self.flush()
+
+    def unpark(self):
+        self.cmd("TRIGGER", False)
+        self.cmd("START", True)
+        self.flush()
+
     def ping(self):
         return True

artiq/examples/master/repository/flopping_f_simulation.py

@@ -52,14 +52,13 @@ class FloppingF(EnvExperiment):
             self.mutate_dataset("flopping_f_frequency", i, f)
             self.mutate_dataset("flopping_f_brightness", i, m_brightness)
             time.sleep(0.1)
-        self.scheduler.submit(self.scheduler.pipeline_name, self.scheduler.expid,
-                              self.scheduler.priority, time.time() + 20, False)
+        self.scheduler.submit(due_date=time.time() + 20)
 
     def analyze(self):
         # Use get_dataset so that analyze can be run stand-alone.
         brightness = self.get_dataset("flopping_f_brightness")
         try:
-            frequency = self.get_dataset("flopping_f_frequency")
+            frequency = self.get_dataset("flopping_f_frequency", archive=False)
         except KeyError:
             # Since flopping_f_frequency is not saved, it is missing if
             # analyze() is run on HDF5 data. But assuming that the arguments
@@ -69,7 +68,8 @@ class FloppingF(EnvExperiment):
             self.set_dataset("flopping_f_frequency", frequency,
                              broadcast=True, save=False)
         popt, pcov = curve_fit(model, frequency, brightness,
-                               p0=[self.get_dataset("flopping_freq", 1500.0)])
+                               p0=[self.get_dataset("flopping_freq", 1500.0,
+                                                    archive=False)])
         perr = np.sqrt(np.diag(pcov))
         if perr < 0.1:
             F0 = float(popt)

artiq/frontend/artiq_compile.py

@@ -55,7 +55,7 @@ def main():
 
         object_map, kernel_library, _, _ = \
             core.compile(exp.run, [exp_inst], {},
-                         with_attr_writeback=False)
+                         attribute_writeback=False)
     except CompileError as error:
         return
     finally:

artiq/frontend/artiq_devtool.py

@@ -0,0 +1,154 @@
+#!/usr/bin/env python3.5
+
+# This script makes the following assumptions:
+#  * miniconda is installed remotely at ~/miniconda
+#  * misoc and artiq are installed remotely via conda
+
+import sys
+import argparse
+import subprocess
+import socket
+import select
+import threading
+import paramiko
+
+from artiq.tools import verbosity_args, init_logger, logger
+from random import Random
+
+
+def get_argparser():
+    parser = argparse.ArgumentParser(description="ARTIQ core device "
+                                                 "development tool")
+
+    verbosity_args(parser)
+
+    parser.add_argument("--host", nargs=1, metavar="HOST",
+                        type=str, default="lab.m-labs.hk",
+                        help="SSH host where the development board is located")
+    parser.add_argument("--serial", nargs=1, metavar="SERIAL",
+                        type=str, default="/dev/ttyUSB0",
+                        help="TTY device corresponding to the development board")
+    parser.add_argument("--ip", nargs=1, metavar="IP",
+                        type=str, default="kc705.lab.m-labs.hk",
+                        help="IP address corresponding to the development board")
+
+    parser.add_argument("actions", metavar="ACTION",
+                        type=str, default=[], nargs="+",
+                        help="actions to perform (sequence of: build boot connect)")
+
+    return parser
+
+
+def main():
+    args = get_argparser().parse_args()
+    init_logger(args)
+
+    ssh = None
+    def get_ssh():
+        nonlocal ssh
+        if ssh is not None:
+            return ssh
+        ssh = paramiko.SSHClient()
+        ssh.load_system_host_keys()
+        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
+        ssh.connect(args.host)
+        return ssh
+
+    sftp = None
+    def get_sftp():
+        nonlocal sftp
+        if sftp is not None:
+            return sftp
+        sftp = get_ssh().open_sftp()
+        return sftp
+
+    rng = Random()
+    tmp = "artiq" + "".join([rng.choice("ABCDEFGHIJKLMNOPQRSTUVWXYZ") for _ in range(6)])
+    env = "bash -c 'export PATH=$HOME/miniconda/bin:$PATH; exec $0 $*' "
+
+    def run_command(cmd):
+        logger.info("Executing {}".format(cmd))
+        chan = get_ssh().get_transport().open_session()
+        chan.set_combine_stderr(True)
+        chan.exec_command(cmd.format(tmp=tmp, env=env, serial=args.serial, ip=args.ip))
+        return chan.makefile()
+
+    def drain(chan):
+        while True:
+            char = chan.read(1)
+            if char == b"":
+                break
+            sys.stderr.write(char.decode("utf-8"))
+
+    for action in args.actions:
+        if action == "build":
+            logger.info("Building runtime")
+            try:
+                subprocess.check_call(["python3", "-m", "artiq.gateware.targets.kc705",
+                                            "-H", "nist_clock",
+                                            "--no-compile-gateware",
+                                            "--output-dir", "/tmp/kc705"])
+            except subprocess.CalledProcessError:
+                logger.error("Build failed")
+                sys.exit(1)
+
+        elif action == "boot":
+            logger.info("Uploading runtime")
+            get_sftp().mkdir("/tmp/{tmp}".format(tmp=tmp))
+            get_sftp().put("/tmp/kc705/software/runtime/runtime.bin",
+                           "/tmp/{tmp}/runtime.bin".format(tmp=tmp))
+
+            logger.info("Booting runtime")
+            flterm = run_command(
+                "{env} python3 flterm.py {serial} " +
+                "--kernel /tmp/{tmp}/runtime.bin --upload-only")
+            artiq_flash = run_command(
+                "{env} artiq_flash start")
+            drain(flterm)
+
+        elif action == "connect":
+            def forwarder(port):
+                listener = socket.socket()
+                listener.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+                listener.bind(('localhost', port))
+                listener.listen(1)
+                while True:
+                    local_stream, peer_addr = listener.accept()
+                    logger.info("Accepting %s:%s and opening SSH channel to %s:%s",
+                                *peer_addr, args.ip, port)
+                    remote_stream = get_ssh().get_transport() \
+                        .open_channel('direct-tcpip', (args.ip, port), peer_addr)
+                    while True:
+                        try:
+                            r, w, x = select.select([local_stream, remote_stream], [], [])
+                            if local_stream in r:
+                                data = local_stream.recv(1024)
+                                if data == b"":
+                                    break
+                                remote_stream.send(data)
+                            if remote_stream in r:
+                                data = remote_stream.recv(1024)
+                                if data == b"":
+                                    break
+                                local_stream.send(data)
+                        except Exception as e:
+                            logger.exception("Forward error on port %s", port)
+                    local_stream.close()
+                    remote_stream.close()
+
+            for port in (1381, 1382):
+                thread = threading.Thread(target=forwarder, args=(port,),
+                                          name="port-{}".format(port), daemon=True)
+                thread.start()
+
+            logger.info("Connecting to device")
+            flterm = run_command(
+                "{env} python3 flterm.py {serial} --output-only")
+            drain(flterm)
+
+        else:
+            logger.error("Unknown action {}".format(action))
+            sys.exit(1)
+
+if __name__ == "__main__":
+    main()

artiq/frontend/artiq_run.py

@@ -73,8 +73,7 @@ class LLVMIRRunner(FileRunner):
         with open(self.file, "r") as f:
             llmodule = llvm.parse_assembly(f.read())
         llmodule.verify()
-        return self.target.link([self.target.assemble(llmodule)],
-                                init_fn="__modinit__")
+        return self.target.link([self.target.assemble(llmodule)])
 
 
 class LLVMBitcodeRunner(FileRunner):
@@ -82,8 +81,7 @@ class LLVMBitcodeRunner(FileRunner):
         with open(self.file, "rb") as f:
             llmodule = llvm.parse_bitcode(f.read())
         llmodule.verify()
-        return self.target.link([self.target.assemble(llmodule)],
-                                init_fn="__modinit__")
+        return self.target.link([self.target.assemble(llmodule)])
 
 
 class DummyScheduler:
@@ -95,7 +93,7 @@ class DummyScheduler:
 
         self._next_rid = 1
 
-    def submit(self, pipeline_name, expid, priority, due_date, flush):
+    def submit(self, pipeline_name=None, expid=None, priority=None, due_date=None, flush=False):
         rid = self._next_rid
         self._next_rid += 1
         logger.info("Submitting: %s, RID=%s", expid, rid)

artiq/gateware/amp/kernel_cpu.py

@@ -7,7 +7,7 @@ from misoc.integration.soc_core import mem_decoder
 
 class KernelCPU(Module):
     def __init__(self, platform,
-                 exec_address=0x42000000,
+                 exec_address=0x40800000,
                  main_mem_origin=0x40000000,
                  l2_size=8192):
         self._reset = CSRStorage(reset=1)

artiq/gateware/amp/mailbox.py

@@ -3,19 +3,19 @@ from misoc.interconnect import wishbone
 
 
 class Mailbox(Module):
-    def __init__(self):
+    def __init__(self, size=1):
         self.i1 = wishbone.Interface()
         self.i2 = wishbone.Interface()
 
         # # #
 
-        value = Signal(32)
+        values = Array([Signal(32) for _ in range(size)])
         for i in self.i1, self.i2:
             self.sync += [
-                i.dat_r.eq(value),
+                i.dat_r.eq(values[i.adr[:bits_for(size-1)]]),
                 i.ack.eq(0),
                 If(i.cyc & i.stb & ~i.ack,
                     i.ack.eq(1),
-                    If(i.we, value.eq(i.dat_w))
+                    If(i.we, values[i.adr[:bits_for(size-1)]].eq(i.dat_w))
                 )
             ]

artiq/gateware/dsp/sawg.py

@@ -1,7 +1,7 @@
 from migen import *
 from misoc.interconnect.stream import Endpoint
-
 from misoc.cores.cordic import Cordic
+
 from .accu import PhasedAccu, Accu
 from .tools import eqh, Delay
 from .spline import Spline

artiq/gateware/phaser.py

@@ -13,10 +13,10 @@ fmc_adapter_io = [
         Subsignal("mosi", Pins("HPC:LA03_N")),
         Subsignal("miso", Pins("HPC:LA04_P")),
         Subsignal("en", Pins("HPC:LA05_N")),
-        IOStandard("LVTTL"),
+        IOStandard("LVCMOS25"),
     ),
-    ("ad9154_txen", 0, Pins("HPC:LA07_P"), IOStandard("LVTTL")),
-    ("ad9154_txen", 1, Pins("HPC:LA07_N"), IOStandard("LVTTL")),
+    ("ad9154_txen", 0, Pins("HPC:LA07_P"), IOStandard("LVCMOS25")),
+    ("ad9154_txen", 1, Pins("HPC:LA07_N"), IOStandard("LVCMOS25")),
     ("ad9154_refclk", 0,
         Subsignal("p", Pins("HPC:GBTCLK0_M2C_P")),
         Subsignal("n", Pins("HPC:GBTCLK0_M2C_N")),
@@ -25,16 +25,19 @@ fmc_adapter_io = [
         Subsignal("p", Pins("HPC:LA00_CC_P")),
         Subsignal("n", Pins("HPC:LA00_CC_N")),
         IOStandard("LVDS_25"),
+        Misc("DIFF_TERM=TRUE"),
     ),
     ("ad9154_sync", 0,
         Subsignal("p", Pins("HPC:LA01_CC_P")),
         Subsignal("n", Pins("HPC:LA01_CC_N")),
         IOStandard("LVDS_25"),
+        Misc("DIFF_TERM=TRUE"),
     ),
     ("ad9154_sync", 1,
         Subsignal("p", Pins("HPC:LA02_P")),
         Subsignal("n", Pins("HPC:LA02_N")),
         IOStandard("LVDS_25"),
+        Misc("DIFF_TERM=TRUE"),
     ),
     ("ad9154_jesd", 0, # AD9154's SERIND7
         Subsignal("txp", Pins("HPC:DP0_C2M_P")),

artiq/gateware/rtio/core.py

@@ -24,10 +24,8 @@ class _GrayCodeTransfer(Module):
         self.sync.rtio += value_gray_rtio.eq(self.i ^ self.i[1:])
         # transfer to system clock domain
         value_gray_sys = Signal(width)
-        self.specials += [
-            NoRetiming(value_gray_rtio),
-            MultiReg(value_gray_rtio, value_gray_sys)
-        ]
+        value_gray_rtio.attr.add("no_retiming")
+        self.specials += MultiReg(value_gray_rtio, value_gray_sys)
         # convert back to binary
         value_sys = Signal(width)
         self.comb += value_sys[-1].eq(value_gray_sys[-1])

artiq/gateware/soc.py

@@ -28,7 +28,7 @@ class AMPSoC:
         self.add_cpulevel_sdram_if(self.kernel_cpu.wb_sdram)
         self.csr_devices.append("kernel_cpu")
 
-        self.submodules.mailbox = amp.Mailbox()
+        self.submodules.mailbox = amp.Mailbox(size=3)
         self.add_wb_slave(mem_decoder(self.mem_map["mailbox"]),
                           self.mailbox.i1)
         self.kernel_cpu.add_wb_slave(mem_decoder(self.mem_map["mailbox"]),

artiq/gateware/targets/kc705.py

@@ -8,7 +8,6 @@ from migen.genlib.cdc import MultiReg
 from migen.build.generic_platform import *
 from migen.build.xilinx.vivado import XilinxVivadoToolchain
 from migen.build.xilinx.ise import XilinxISEToolchain
-from migen.fhdl.specials import Keep
 from migen.genlib.io import DifferentialInput
 
 from jesd204b.common import (JESD204BTransportSettings,
@@ -149,10 +148,10 @@ class _NIST_Ions(MiniSoC, AMPSoC):
         self.register_kernel_cpu_csrdevice("i2c")
         self.config["I2C_BUS_COUNT"] = 1
 
-    def add_rtio(self, rtio_channels, rtio_crg=None):
-        if rtio_crg is None:
-            rtio_crg = _RTIOCRG(self.platform, self.crg.cd_sys.clk)
-        self.submodules.rtio_crg = rtio_crg
+        self.config["HAS_DDS"] = None
+
+    def add_rtio(self, rtio_channels):
+        self.submodules.rtio_crg = _RTIOCRG(self.platform, self.crg.cd_sys.clk)
         self.csr_devices.append("rtio_crg")
         self.submodules.rtio = rtio.RTIO(rtio_channels)
         self.register_kernel_cpu_csrdevice("rtio")
@@ -160,22 +159,11 @@ class _NIST_Ions(MiniSoC, AMPSoC):
         self.submodules.rtio_moninj = rtio.MonInj(rtio_channels)
         self.csr_devices.append("rtio_moninj")
 
-        self.specials += [
-            Keep(self.rtio.cd_rsys.clk),
-            Keep(self.rtio_crg.cd_rtio.clk),
-            Keep(self.ethphy.crg.cd_eth_rx.clk),
-            Keep(self.ethphy.crg.cd_eth_tx.clk),
-        ]
-
-        self.platform.add_period_constraint(self.rtio.cd_rsys.clk, 8.)
+        self.rtio_crg.cd_rtio.clk.attr.add("keep")
         self.platform.add_period_constraint(self.rtio_crg.cd_rtio.clk, 8.)
-        self.platform.add_period_constraint(self.ethphy.crg.cd_eth_rx.clk, 8.)
-        self.platform.add_period_constraint(self.ethphy.crg.cd_eth_tx.clk, 8.)
         self.platform.add_false_path_constraints(
-            self.rtio.cd_rsys.clk,
-            self.rtio_crg.cd_rtio.clk,
-            self.ethphy.crg.cd_eth_rx.clk,
-            self.ethphy.crg.cd_eth_tx.clk)
+            self.crg.cd_sys.clk,
+            self.rtio_crg.cd_rtio.clk)
 
         self.submodules.rtio_analyzer = rtio.Analyzer(self.rtio,
             self.get_native_sdram_if())
@@ -223,7 +211,7 @@ class NIST_QC1(_NIST_Ions):
         self.config["RTIO_FIRST_DDS_CHANNEL"] = len(rtio_channels)
         self.config["RTIO_DDS_COUNT"] = 1
         self.config["DDS_CHANNELS_PER_BUS"] = 8
-        self.config["DDS_AD9858"] = True
+        self.config["DDS_AD9858"] = None
         phy = dds.AD9858(platform.request("dds"), 8)
         self.submodules += phy
         rtio_channels.append(rtio.Channel.from_phy(phy,
@@ -297,8 +285,8 @@ class NIST_CLOCK(_NIST_Ions):
         self.config["RTIO_FIRST_DDS_CHANNEL"] = len(rtio_channels)
         self.config["RTIO_DDS_COUNT"] = 1
         self.config["DDS_CHANNELS_PER_BUS"] = 11
-        self.config["DDS_AD9914"] = True
-        self.config["DDS_ONEHOT_SEL"] = True
+        self.config["DDS_AD9914"] = None
+        self.config["DDS_ONEHOT_SEL"] = None
         phy = dds.AD9914(platform.request("dds"), 11, onehot=True)
         self.submodules += phy
         rtio_channels.append(rtio.Channel.from_phy(phy,
@@ -375,8 +363,8 @@ class NIST_QC2(_NIST_Ions):
         self.config["RTIO_FIRST_DDS_CHANNEL"] = len(rtio_channels)
         self.config["RTIO_DDS_COUNT"] = 2
         self.config["DDS_CHANNELS_PER_BUS"] = 12
-        self.config["DDS_AD9914"] = True
-        self.config["DDS_ONEHOT_SEL"] = True
+        self.config["DDS_AD9914"] = None
+        self.config["DDS_ONEHOT_SEL"] = None
         for backplane_offset in range(2):
             phy = dds.AD9914(
                 platform.request("dds", backplane_offset), 12, onehot=True)
@@ -394,11 +382,10 @@ class NIST_QC2(_NIST_Ions):
 
 
 class _PhaserCRG(Module, AutoCSR):
-    def __init__(self, platform, rtio_internal_clk):
+    def __init__(self, platform, refclk):
         self._clock_sel = CSRStorage()
         self._pll_reset = CSRStorage(reset=1)
         self._pll_locked = CSRStatus()
-        self.refclk = Signal()
         self.clock_domains.cd_rtio = ClockDomain()
         self.clock_domains.cd_rtiox4 = ClockDomain(reset_less=True)
 
@@ -411,11 +398,11 @@ class _PhaserCRG(Module, AutoCSR):
 
                      p_REF_JITTER1=0.01, p_REF_JITTER2=0.01,
                      p_CLKIN1_PERIOD=4.0, p_CLKIN2_PERIOD=4.0,
-                     i_CLKIN1=0, i_CLKIN2=self.refclk,
+                     i_CLKIN1=0, i_CLKIN2=refclk,
                      # Warning: CLKINSEL=0 means CLKIN2 is selected
                      i_CLKINSEL=~self._clock_sel.storage,
 
-                     # VCO @ 1GHz when using 125MHz input
+                     # VCO @ 1GHz when using 250MHz input
                      p_CLKFBOUT_MULT=8, p_DIVCLK_DIVIDE=2,
                      i_CLKFBIN=self.cd_rtio.clk,
                      i_RST=self._pll_reset.storage,
@@ -431,6 +418,8 @@ class _PhaserCRG(Module, AutoCSR):
             MultiReg(pll_locked | ~self._clock_sel.storage,
                      self._pll_locked.status)
         ]
+        self.cd_rtio.clk.attr.add("keep")
+        platform.add_period_constraint(self.cd_rtio.clk, 8.)
 
 
 class AD9154JESD(Module, AutoCSR):
@@ -444,28 +433,29 @@ class AD9154JESD(Module, AutoCSR):
 
         sync_pads = platform.request("ad9154_sync")
         self.jsync = Signal()
-        self.refclk = Signal()
         self.specials += DifferentialInput(
             sync_pads.p, sync_pads.n, self.jsync)
 
+        refclk = Signal()
         self.clock_domains.cd_jesd = ClockDomain()
         refclk_pads = platform.request("ad9154_refclk")
-        platform.add_period_constraint(refclk_pads.p, 1e9/refclk_freq)
 
         self.specials += [
             Instance("IBUFDS_GTE2", i_CEB=0,
-                     i_I=refclk_pads.p, i_IB=refclk_pads.n, o_O=self.refclk),
-            Instance("BUFG", i_I=self.refclk, o_O=self.cd_jesd.clk),
+                     i_I=refclk_pads.p, i_IB=refclk_pads.n, o_O=refclk),
+            Instance("BUFG", i_I=refclk, o_O=self.cd_jesd.clk),
             AsyncResetSynchronizer(self.cd_jesd, ResetSignal("rio_phy")),
         ]
+        self.cd_jesd.clk.attr.add("keep")
         platform.add_period_constraint(self.cd_jesd.clk, 1e9/refclk_freq)
 
-        qpll = GTXQuadPLL(self.refclk, refclk_freq, linerate)
+        qpll = GTXQuadPLL(refclk, refclk_freq, linerate)
         self.submodules += qpll
         phys = []
         for i in range(4):
             phy = JESD204BPhyTX(
                 qpll, platform.request("ad9154_jesd", i), fabric_freq)
+            phy.gtx.cd_tx.clk.attr.add("keep")
             platform.add_period_constraint(phy.gtx.cd_tx.clk, 40*1e9/linerate)
             platform.add_false_path_constraints(self.cd_jesd.clk,
                                                 phy.gtx.cd_tx.clk)
@@ -484,16 +474,15 @@ class AD9154JESD(Module, AutoCSR):
 
         # blinking leds for transceiver reset status
         for i in range(4):
-            led = platform.request("user_led", 4 + i)
-            counter = Signal(max=fabric_freq//2 + 1)
+            counter = Signal(max=fabric_freq)
+            self.comb += platform.request("user_led", 4 + i).eq(counter[-1])
             sync = getattr(self.sync, "phy{}_tx".format(i))
-            sync += \
+            sync += [
+                counter.eq(counter - 1),
                 If(counter == 0,
-                    led.eq(~led),
-                    counter.eq(fabric_freq//2)
-                ).Else(
-                    counter.eq(counter - 1)
+                    counter.eq(fabric_freq - 1)
                 )
+            ]
 
 
 class AD9154(Module, AutoCSR):
@@ -517,18 +506,43 @@ class AD9154(Module, AutoCSR):
             self.sync.jesd += conv.eq(Mux(z, Cat(ch.o[:2]), Cat(ch.o[2:])))
 
 
-class Phaser(_NIST_Ions):
+class Phaser(MiniSoC, AMPSoC):
     mem_map = {
+        "timer_kernel":  0x10000000, # (shadow @0x90000000)
+        "rtio":          0x20000000, # (shadow @0xa0000000)
+        "i2c":           0x30000000, # (shadow @0xb0000000)
+        "mailbox":       0x70000000, # (shadow @0xf0000000)
         "ad9154":        0x50000000,
     }
-    mem_map.update(_NIST_Ions.mem_map)
+    mem_map.update(MiniSoC.mem_map)
 
     def __init__(self, cpu_type="or1k", **kwargs):
-        _NIST_Ions.__init__(self, cpu_type, **kwargs)
+        MiniSoC.__init__(self,
+                         cpu_type=cpu_type,
+                         sdram_controller_type="minicon",
+                         l2_size=128*1024,
+                         with_timer=False,
+                         ident=artiq_version,
+                         **kwargs)
+        AMPSoC.__init__(self)
+        self.platform.toolchain.bitstream_commands.extend([
+            "set_property BITSTREAM.GENERAL.COMPRESS True [current_design]",
+        ])
 
         platform = self.platform
+        platform.add_extension(_ams101_dac)
         platform.add_extension(phaser.fmc_adapter_io)
 
+        self.submodules.leds = gpio.GPIOOut(Cat(
+            platform.request("user_led", 0),
+            platform.request("user_led", 1)))
+        self.csr_devices.append("leds")
+
+        i2c = platform.request("i2c")
+        self.submodules.i2c = gpio.GPIOTristate([i2c.scl, i2c.sda])
+        self.register_kernel_cpu_csrdevice("i2c")
+        self.config["I2C_BUS_COUNT"] = 1
+
         self.submodules.ad9154 = AD9154(platform)
         self.register_kernel_cpu_csrdevice("ad9154")
         self.config["AD9154_DAC_CS"] = 1 << 0
@@ -537,7 +551,7 @@ class Phaser(_NIST_Ions):
         rtio_channels = []
 
         phy = ttl_serdes_7series.Inout_8X(
-            platform.request("user_sma_gpio_n_33"))
+            platform.request("user_sma_gpio_n"))
         self.submodules += phy
         rtio_channels.append(rtio.Channel.from_phy(phy, ififo_depth=128))
 
@@ -565,9 +579,29 @@ class Phaser(_NIST_Ions):
 
         self.config["RTIO_LOG_CHANNEL"] = len(rtio_channels)
         rtio_channels.append(rtio.LogChannel())
-        self.add_rtio(rtio_channels, _PhaserCRG(platform, self.crg.cd_sys.clk))
 
-        self.comb += self.rtio_crg.refclk.eq(self.ad9154.jesd.cd_jesd.clk)
+        self.config["RTIO_FIRST_DDS_CHANNEL"] = len(rtio_channels)
+        self.config["RTIO_DDS_COUNT"] = 1
+        self.config["DDS_CHANNELS_PER_BUS"] = 1
+        self.config["DDS_AD9914"] = None
+        self.config["DDS_ONEHOT_SEL"] = None
+        self.config["DDS_RTIO_CLK_RATIO"] = 8
+
+        self.submodules.rtio_crg = _PhaserCRG(
+            platform, self.ad9154.jesd.cd_jesd.clk)
+        self.csr_devices.append("rtio_crg")
+        self.submodules.rtio = rtio.RTIO(rtio_channels)
+        self.register_kernel_cpu_csrdevice("rtio")
+        self.submodules.rtio_moninj = rtio.MonInj(rtio_channels)
+        self.csr_devices.append("rtio_moninj")
+        self.submodules.rtio_analyzer = rtio.Analyzer(
+            self.rtio, self.get_native_sdram_if())
+        self.csr_devices.append("rtio_analyzer")
+
+        self.config["RTIO_FINE_TS_WIDTH"] = self.rtio.fine_ts_width
+        platform.add_false_path_constraints(
+            self.crg.cd_sys.clk,
+            self.rtio_crg.cd_rtio.clk)
 
 
 def main():

artiq/gateware/targets/pipistrello.py

@@ -206,10 +206,11 @@ trce -v 12 -fastpaths -tsi {build_name}.tsi -o {build_name}.twr {build_name}.ncd
         rtio_channels.append(rtio.Channel.from_phy(
             phy, ofifo_depth=64, ififo_depth=64))
 
+        self.config["HAS_DDS"] = None
         self.config["RTIO_FIRST_DDS_CHANNEL"] = len(rtio_channels)
         self.config["RTIO_DDS_COUNT"] = 1
         self.config["DDS_CHANNELS_PER_BUS"] = 8
-        self.config["DDS_AD9858"] = True
+        self.config["DDS_AD9858"] = None
         dds_pins = platform.request("dds")
         self.comb += dds_pins.p.eq(0)
         phy = dds.AD9858(dds_pins, 8)

artiq/language/core.py

@@ -7,7 +7,7 @@ from functools import wraps
 import numpy
 
 
-__all__ = ["kernel", "portable", "syscall", "host_only",
+__all__ = ["kernel", "portable", "rpc", "syscall", "host_only",
            "set_time_manager", "set_watchdog_factory",
            "TerminationRequested"]
 
@@ -22,7 +22,7 @@ __all__.extend(kernel_globals)
 
 
 _ARTIQEmbeddedInfo = namedtuple("_ARTIQEmbeddedInfo",
-                                "core_name function syscall forbidden flags")
+                                "core_name portable function syscall forbidden flags")
 
 def kernel(arg=None, flags={}):
     """
@@ -53,7 +53,7 @@ def kernel(arg=None, flags={}):
             def run_on_core(self, *k_args, **k_kwargs):
                 return getattr(self, arg).run(run_on_core, ((self,) + k_args), k_kwargs)
             run_on_core.artiq_embedded = _ARTIQEmbeddedInfo(
-                core_name=arg, function=function, syscall=None,
+                core_name=arg, portable=False, function=function, syscall=None,
                 forbidden=False, flags=set(flags))
             return run_on_core
         return inner_decorator
@@ -83,7 +83,23 @@ def portable(arg=None, flags={}):
         return inner_decorator
     else:
         arg.artiq_embedded = \
-            _ARTIQEmbeddedInfo(core_name=None, function=arg, syscall=None,
+            _ARTIQEmbeddedInfo(core_name=None, portable=True, function=arg, syscall=None,
+                               forbidden=False, flags=set(flags))
+        return arg
+
+def rpc(arg=None, flags={}):
+    """
+    This decorator marks a function for execution on the host interpreter.
+    This is also the default behavior of ARTIQ; however, this decorator allows
+    specifying additional flags.
+    """
+    if arg is None:
+        def inner_decorator(function):
+            return rpc(function, flags)
+        return inner_decorator
+    else:
+        arg.artiq_embedded = \
+            _ARTIQEmbeddedInfo(core_name=None, portable=False, function=arg, syscall=None,
                                forbidden=False, flags=set(flags))
         return arg
 
@@ -101,7 +117,7 @@ def syscall(arg=None, flags={}):
     if isinstance(arg, str):
         def inner_decorator(function):
             function.artiq_embedded = \
-                _ARTIQEmbeddedInfo(core_name=None, function=None,
+                _ARTIQEmbeddedInfo(core_name=None, portable=False, function=None,
                                    syscall=function.__name__, forbidden=False,
                                    flags=set(flags))
             return function
@@ -119,7 +135,7 @@ def host_only(function):
     in the host Python interpreter.
     """
     function.artiq_embedded = \
-        _ARTIQEmbeddedInfo(core_name=None, function=None, syscall=None,
+        _ARTIQEmbeddedInfo(core_name=None, portable=False, function=None, syscall=None,
                            forbidden=True, flags={})
     return function
 

artiq/language/environment.py

@@ -3,6 +3,7 @@ from inspect import isclass
 
 from artiq.protocols import pyon
 from artiq.language import units
+from artiq.language.core import rpc
 
 
 __all__ = ["NoDefault",
@@ -274,6 +275,7 @@ class HasEnvironment:
         kernel_invariants = getattr(self, "kernel_invariants", set())
         self.kernel_invariants = kernel_invariants | {key}
 
+    @rpc(flags={"async"})
     def set_dataset(self, key, value,
                     broadcast=False, persist=False, save=True):
         """Sets the contents and handling modes of a dataset.
@@ -290,6 +292,7 @@ class HasEnvironment:
         """
         self.__dataset_mgr.set(key, value, broadcast, persist, save)
 
+    @rpc(flags={"async"})
     def mutate_dataset(self, key, index, value):
         """Mutate an existing dataset at the given index (e.g. set a value at
         a given position in a NumPy array)
@@ -303,7 +306,7 @@ class HasEnvironment:
         as ``slice(*sub_tuple)`` (multi-dimensional slicing)."""
         self.__dataset_mgr.mutate(key, index, value)
 
-    def get_dataset(self, key, default=NoDefault):
+    def get_dataset(self, key, default=NoDefault, archive=True):
         """Returns the contents of a dataset.
 
         The local storage is searched first, followed by the master storage
@@ -312,19 +315,25 @@ class HasEnvironment:
 
         If the dataset does not exist, returns the default value. If no default
         is provided, raises ``KeyError``.
+
+        By default, datasets obtained by this method are archived into the output
+        HDF5 file of the experiment. If an archived dataset is requested more
+        than one time (and therefore its value has potentially changed) or is
+        modified, a warning is emitted. Archival can be turned off by setting
+        the ``archive`` argument to ``False``.
         """
         try:
-            return self.__dataset_mgr.get(key)
+            return self.__dataset_mgr.get(key, archive)
         except KeyError:
             if default is NoDefault:
                 raise
             else:
                 return default
 
-    def setattr_dataset(self, key, default=NoDefault):
+    def setattr_dataset(self, key, default=NoDefault, archive=True):
         """Sets the contents of a dataset as attribute. The names of the
         dataset and of the attribute are the same."""
-        setattr(self, key, self.get_dataset(key, default))
+        setattr(self, key, self.get_dataset(key, default, archive))
 
 
 class Experiment:

artiq/language/types.py

@@ -6,7 +6,7 @@ annotations.
 from artiq.compiler import types, builtins
 
 __all__ = ["TNone", "TBool", "TInt32", "TInt64", "TFloat",
-           "TStr", "TList", "TRange32", "TRange64", "TVar"]
+           "TStr", "TTuple", "TList", "TRange32", "TRange64", "TVar"]
 
 TNone      = builtins.TNone()
 TBool      = builtins.TBool()
@@ -14,6 +14,7 @@ TInt32     = builtins.TInt(types.TValue(32))
 TInt64     = builtins.TInt(types.TValue(64))
 TFloat     = builtins.TFloat()
 TStr       = builtins.TStr()
+TTuple     = types.TTuple
 TList      = builtins.TList
 TRange32   = builtins.TRange(builtins.TInt(types.TValue(32)))
 TRange64   = builtins.TRange(builtins.TInt(types.TValue(64)))

artiq/language/units.py

@@ -18,3 +18,4 @@ _register_unit("s", "pnum_")
 _register_unit("Hz", "_kMG")
 _register_unit("dB", "_")
 _register_unit("V", "um_k")
+_register_unit("A", "um_")

artiq/master/scheduler.py

@@ -402,8 +402,12 @@ class Scheduler:
         if self._pipelines:
             logger.warning("some pipelines were not garbage-collected")
 
-    def submit(self, pipeline_name, expid, priority, due_date, flush):
-        """Submits a new run."""
+    def submit(self, pipeline_name, expid, priority=0, due_date=None, flush=False):
+        """Submits a new run.
+
+        When called through an experiment, the default values of
+        ``pipeline_name``, ``expid`` and ``priority`` correspond to those of
+        the current run."""
         # mutates expid to insert head repository revision if None
         if self._terminated:
             return
@@ -446,6 +450,9 @@ class Scheduler:
         whether returning control to the host and pausing would have an effect,
         in order to avoid the cost of switching kernels in the common case
         where ``pause`` does nothing.
+
+        This function does not have side effects, and does not have to be
+        followed by a call to ``pause``.
         """
         for pipeline in self._pipelines.values():
             if rid in pipeline.pool.runs:

artiq/master/worker_db.py

@@ -181,23 +181,35 @@ class DatasetManager:
     def __init__(self, ddb):
         self.broadcast = Notifier(dict())
         self.local = dict()
+        self.archive = dict()
 
         self.ddb = ddb
         self.broadcast.publish = ddb.update
 
     def set(self, key, value, broadcast=False, persist=False, save=True):
+        if key in self.archive:
+            logger.warning("Modifying dataset '%s' which is in archive, "
+                           "archive will remain untouched",
+                           key, stack_info=True)
+
         if persist:
             broadcast = True
         if broadcast:
             self.broadcast[key] = persist, value
+        elif key in self.broadcast.read:
+            del self.broadcast[key]
         if save:
             self.local[key] = value
+        elif key in self.local:
+            del self.local[key]
 
     def mutate(self, key, index, value):
         target = None
         if key in self.local:
             target = self.local[key]
         if key in self.broadcast.read:
+            if target is not None:
+                assert target is self.broadcast.read[key][1]
             target = self.broadcast[key][1]
         if target is None:
             raise KeyError("Cannot mutate non-existing dataset")
@@ -209,12 +221,22 @@ class DatasetManager:
                 index = slice(*index)
         setitem(target, index, value)
 
-    def get(self, key):
+    def get(self, key, archive=False):
         if key in self.local:
             return self.local[key]
         else:
-            return self.ddb.get(key)
+            data = self.ddb.get(key)
+            if archive:
+                if key in self.archive:
+                    logger.warning("Dataset '%s' is already in archive, "
+                                   "overwriting", key, stack_info=True)
+                self.archive[key] = data
+            return data
 
     def write_hdf5(self, f):
+        datasets_group = f.create_group("datasets")
         for k, v in self.local.items():
-            f[k] = v
+            datasets_group[k] = v
+        archive_group = f.create_group("archive")
+        for k, v in self.archive.items():
+            archive_group[k] = v

artiq/master/worker_impl.py

@@ -79,32 +79,39 @@ set_watchdog_factory(Watchdog)
 
 
 class Scheduler:
-    pause_noexc = staticmethod(make_parent_action("pause"))
-
-    @host_only
-    def pause(self):
-        if self.pause_noexc():
-            raise TerminationRequested
-
-    submit = staticmethod(make_parent_action("scheduler_submit"))
-    delete = staticmethod(make_parent_action("scheduler_delete"))
-    request_termination = staticmethod(
-        make_parent_action("scheduler_request_termination"))
-    get_status = staticmethod(make_parent_action("scheduler_get_status"))
-
     def set_run_info(self, rid, pipeline_name, expid, priority):
         self.rid = rid
         self.pipeline_name = pipeline_name
         self.expid = expid
         self.priority = priority
 
-    _check_pause = staticmethod(make_parent_action("scheduler_check_pause"))
+    pause_noexc = staticmethod(make_parent_action("pause"))
+    @host_only
+    def pause(self):
+        if self.pause_noexc():
+            raise TerminationRequested
 
+    _check_pause = staticmethod(make_parent_action("scheduler_check_pause"))
     def check_pause(self, rid=None) -> TBool:
         if rid is None:
             rid = self.rid
         return self._check_pause(rid)
 
+    _submit = staticmethod(make_parent_action("scheduler_submit"))
+    def submit(self, pipeline_name=None, expid=None, priority=None, due_date=None, flush=False):
+        if pipeline_name is None:
+            pipeline_name = self.pipeline_name
+        if expid is None:
+            expid = self.expid
+        if priority is None:
+            priority = self.priority
+        return self._submit(pipeline_name, expid, priority, due_date, flush)
+
+    delete = staticmethod(make_parent_action("scheduler_delete"))
+    request_termination = staticmethod(
+        make_parent_action("scheduler_request_termination"))
+    get_status = staticmethod(make_parent_action("scheduler_get_status"))
+
 
 class CCB:
     issue = staticmethod(make_parent_action("ccb_issue"))
@@ -238,7 +245,7 @@ def main():
             elif action == "write_results":
                 filename = "{:09}-{}.h5".format(rid, exp.__name__)
                 with h5py.File(filename, "w") as f:
-                    dataset_mgr.write_hdf5(f.create_group("datasets"))
+                    dataset_mgr.write_hdf5(f)
                     f["artiq_version"] = artiq_version
                     f["rid"] = rid
                     f["start_time"] = int(time.mktime(start_time))

artiq/runtime.rs/Cargo.lock

@@ -2,15 +2,24 @@
 name = "runtime"
 version = "0.0.0"
 dependencies = [
+ "byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fringe 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log_buffer 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lwip 0.0.0",
  "std_artiq 0.0.0",
+ "walkdir 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "alloc_artiq"
 version = "0.0.0"
 
+[[package]]
+name = "byteorder"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fringe"
 version = "1.1.0"
@@ -19,11 +28,30 @@ dependencies = [
  "libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "kernel32-sys"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "log"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "log_buffer"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "lwip"
 version = "0.0.0"
@@ -43,6 +71,32 @@ dependencies = [
  "alloc_artiq 0.0.0",
 ]
 
+[[package]]
+name = "walkdir"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "winapi"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "winapi-build"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [metadata]
+"checksum byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0fc10e8cc6b2580fda3f36eb6dc5316657f812a3df879a44a66fc9f0fdbc4855"
 "checksum fringe 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "987689dcfad85eee8d76b477865641ec483e63fb86d52966bfc350c4a647d78a"
+"checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
 "checksum libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)" = "23e3757828fa702a20072c37ff47938e9dd331b92fac6e223d26d4b7a55f7ee2"
+"checksum log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "ab83497bf8bf4ed2a74259c1c802351fcd67a65baa86394b6ba73c36f4838054"
+"checksum log_buffer 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ec57723b84bbe7bdf76aa93169c9b59e67473317c6de3a83cb2a0f8ccb2aa493"
+"checksum walkdir 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "c66c0b9792f0a765345452775f3adbd28dde9d33f30d13e5dcc5ae17cf6f3780"
+"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
+"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"

artiq/runtime.rs/Cargo.toml

@@ -2,16 +2,23 @@
 authors = ["The ARTIQ Project Developers"]
 name = "runtime"
 version = "0.0.0"
+build = "build.rs"
+
+[build-dependencies]
+walkdir = "0.1"
 
 [lib]
-name = "artiq_rust"
+name = "runtime"
 crate-type = ["staticlib"]
 path = "src/lib.rs"
 
 [dependencies]
-std_artiq = { path = "libstd_artiq" }
+std_artiq = { path = "libstd_artiq", features = ["alloc"] }
+lwip = { path = "liblwip", default-features = false }
 fringe = { version = "= 1.1.0", default-features = false, features = ["alloc"] }
-lwip = { path = "liblwip" }
+log = { version = "0.3", default-features = false, features = ["max_level_debug"] }
+log_buffer = { version = "1.0" }
+byteorder = { version = "0.5", default-features = false }
 
 [profile.dev]
 panic = 'abort'

artiq/runtime.rs/build.rs

@@ -0,0 +1,42 @@
+extern crate walkdir;
+
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::Path;
+use std::process::Command;
+
+use walkdir::WalkDir;
+
+fn main() {
+    let out_dir = env::var("OUT_DIR").unwrap();
+    let dest_path = Path::new(&out_dir).join("git_info.rs");
+    let mut f = File::create(&dest_path).unwrap();
+
+    writeln!(f, "const GIT_COMMIT: &'static str = {:?};",
+                git_describe().unwrap()).unwrap();
+
+    println!("cargo:rerun-if-changed=../../.git/HEAD");
+    for entry in WalkDir::new("../../.git/refs") {
+        let entry = entry.unwrap();
+        println!("cargo:rerun-if-changed={}", entry.path().display());
+    }
+}
+
+// Returns `None` if git is not available.
+fn git_describe() -> Option<String> {
+    Command::new("git")
+        .arg("describe")
+        .arg("--tags")
+        .arg("--dirty")
+        .arg("--always")
+        .arg("--long")
+        .output()
+        .ok()
+        .and_then(|o| String::from_utf8(o.stdout).ok())
+        .map(|mut s| {
+            let len = s.trim_right().len();
+            s.truncate(len);
+            s
+        })
+}

artiq/runtime.rs/libksupport/Cargo.lock

@@ -0,0 +1,26 @@
+[root]
+name = "ksupport"
+version = "0.0.0"
+dependencies = [
+ "byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "std_artiq 0.0.0",
+]
+
+[[package]]
+name = "alloc_artiq"
+version = "0.0.0"
+
+[[package]]
+name = "byteorder"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "std_artiq"
+version = "0.0.0"
+dependencies = [
+ "alloc_artiq 0.0.0",
+]
+
+[metadata]
+"checksum byteorder 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0fc10e8cc6b2580fda3f36eb6dc5316657f812a3df879a44a66fc9f0fdbc4855"

artiq/runtime.rs/libksupport/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+authors = ["The ARTIQ Project Developers"]
+name = "ksupport"
+version = "0.0.0"
+
+[lib]
+name = "ksupport"
+path = "lib.rs"
+crate-type = ["staticlib"]
+
+[dependencies]
+std_artiq = { path = "../libstd_artiq" }
+byteorder = { version = "0.5", default-features = false }
+
+[profile.dev]
+panic = 'unwind'
+opt-level = 2

artiq/runtime.rs/libksupport/api.rs

@@ -0,0 +1,138 @@
+use libc::{c_void, c_char, size_t};
+
+macro_rules! api {
+    ($i:ident) => ({
+        extern { static $i: c_void; }
+        api!($i = &$i as *const _)
+    });
+    ($i:ident, $d:item) => ({
+        $d
+        api!($i = $i)
+    });
+    ($i:ident = $e:expr) => {
+        (stringify!($i), unsafe { $e as *const () })
+    }
+}
+
+pub fn resolve(required: &str) -> usize {
+    unsafe {
+        API.iter()
+           .find(|&&(exported, _)| exported == required)
+           .map(|&(_, ptr)| ptr as usize)
+           .unwrap_or(0)
+    }
+}
+
+#[allow(unused_unsafe)]
+static mut API: &'static [(&'static str, *const ())] = &[
+    api!(__divsi3),
+    api!(__modsi3),
+    api!(__ledf2),
+    api!(__gedf2),
+    api!(__unorddf2),
+    api!(__eqdf2),
+    api!(__ltdf2),
+    api!(__nedf2),
+    api!(__gtdf2),
+    api!(__negsf2),
+    api!(__negdf2),
+    api!(__addsf3),
+    api!(__subsf3),
+    api!(__mulsf3),
+    api!(__divsf3),
+    api!(__lshrdi3),
+    api!(__muldi3),
+    api!(__divdi3),
+    api!(__ashldi3),
+    api!(__ashrdi3),
+    api!(__udivmoddi4),
+    api!(__floatsisf),
+    api!(__floatunsisf),
+    api!(__fixsfsi),
+    api!(__fixunssfsi),
+    api!(__adddf3),
+    api!(__subdf3),
+    api!(__muldf3),
+    api!(__divdf3),
+    api!(__floatsidf),
+    api!(__floatunsidf),
+    api!(__floatdidf),
+    api!(__fixdfsi),
+    api!(__fixdfdi),
+    api!(__fixunsdfsi),
+    api!(__clzsi2),
+    api!(__ctzsi2),
+    api!(__udivdi3),
+    api!(__umoddi3),
+    api!(__moddi3),
+    api!(__powidf2),
+
+    /* libc */
+    api!(strcmp),
+    api!(strlen, extern { fn strlen(s: *const c_char) -> size_t; }),
+    api!(abort = ::abort),
+
+    /* libm */
+    api!(sqrt),
+    api!(round),
+
+    /* exceptions */
+    api!(_Unwind_Resume),
+    api!(__artiq_personality),
+    api!(__artiq_raise),
+    api!(__artiq_reraise),
+
+    /* proxified syscalls */
+    api!(core_log),
+
+    api!(now = &::NOW as *const _),
+
+    api!(watchdog_set = ::watchdog_set),
+    api!(watchdog_clear = ::watchdog_clear),
+
+    api!(send_rpc = ::send_rpc),
+    api!(send_async_rpc = ::send_async_rpc),
+    api!(recv_rpc = ::recv_rpc),
+
+    api!(cache_get = ::cache_get),
+    api!(cache_put = ::cache_put),
+
+    /* direct syscalls */
+    api!(rtio_init),
+    api!(rtio_get_counter),
+    api!(rtio_log),
+    api!(rtio_output),
+    api!(rtio_input_timestamp),
+    api!(rtio_input_data),
+
+    #[cfg(has_dds)]
+    api!(dds_init),
+    #[cfg(has_dds)]
+    api!(dds_init_sync),
+    #[cfg(has_dds)]
+    api!(dds_batch_enter),
+    #[cfg(has_dds)]
+    api!(dds_batch_exit),
+    #[cfg(has_dds)]
+    api!(dds_set),
+
+    api!(i2c_init),
+    api!(i2c_start),
+    api!(i2c_stop),
+    api!(i2c_write),
+    api!(i2c_read),
+
+// #if (defined CONFIG_AD9154_CS)
+    api!(ad9154_init),
+    api!(ad9154_write),
+    api!(ad9154_read),
+
+    api!(ad9516_write),
+    api!(ad9516_read),
+
+    api!(ad9154_jesd_enable),
+    api!(ad9154_jesd_ready),
+    api!(ad9154_jesd_prbs),
+    api!(ad9154_jesd_stpl),
+// #endif
+];

artiq/runtime.rs/libksupport/dyld.rs

@@ -0,0 +1,56 @@
+use core::{ptr, slice, str};
+use libc::{c_void, c_char, c_int, size_t};
+
+#[allow(non_camel_case_types)]
+#[repr(C)]
+#[derive(Default)]
+struct dyld_info {
+    __opaque: [usize; 7]
+}
+
+extern {
+    fn dyld_load(shlib: *const c_void, base: usize,
+                 resolve: extern fn(*mut c_void, *const c_char) -> usize,
+                 resolve_data: *mut c_void,
+                 info: *mut dyld_info, error_out: *mut *const c_char) -> c_int;
+    fn dyld_lookup(symbol: *const c_char, info: *const dyld_info) -> *const c_void;
+
+    fn strlen(ptr: *const c_char) -> size_t;
+}
+
+pub struct Library {
+    lower: dyld_info
+}
+
+impl Library {
+    pub unsafe fn load<F>(shlib: &[u8], base: usize, mut resolve: F)
+                -> Result<Library, &'static str>
+            where F: Fn(&str) -> usize {
+        extern fn wrapper<F>(data: *mut c_void, name: *const c_char) -> usize
+                where F: Fn(&str) -> usize {
+            unsafe {
+                let f = data as *mut F;
+                let name = slice::from_raw_parts(name as *const u8, strlen(name));
+                (*f)(str::from_utf8_unchecked(name))
+            }
+        }
+
+        let mut library = Library { lower: dyld_info::default() };
+        let mut error: *const c_char = ptr::null();
+        if dyld_load(shlib.as_ptr() as *const _, base,
+                     wrapper::<F>, &mut resolve as *mut _ as *mut _,
+                     &mut library.lower, &mut error) == 0 {
+            let error = slice::from_raw_parts(error as *const u8, strlen(error));
+            Err(str::from_utf8_unchecked(error))
+        } else {
+            Ok(library)
+        }
+    }
+
+    pub unsafe fn lookup(&self, symbol: &str) -> usize {
+        assert!(symbol.len() < 32);
+        let mut buf = [0u8; 32];
+        buf[0..symbol.as_bytes().len()].copy_from_slice(symbol.as_bytes());
+        dyld_lookup(&buf as *const _ as *const c_char, &self.lower) as usize
+    }
+}

artiq/runtime.rs/libksupport/lib.rs

@@ -0,0 +1,308 @@
+#![feature(lang_items, needs_panic_runtime, asm, libc, stmt_expr_attributes)]
+
+#![no_std]
+#![needs_panic_runtime]
+
+#[macro_use]
+extern crate std_artiq as std;
+extern crate libc;
+extern crate byteorder;
+
+#[path = "../src/board.rs"]
+mod board;
+#[path = "../src/mailbox.rs"]
+mod mailbox;
+
+#[path = "../src/proto.rs"]
+mod proto;
+#[path = "../src/kernel_proto.rs"]
+mod kernel_proto;
+#[path = "../src/rpc_proto.rs"]
+mod rpc_proto;
+
+mod dyld;
+mod api;
+
+use core::{mem, ptr, slice, str};
+use std::io::Cursor;
+use libc::{c_char, size_t};
+use kernel_proto::*;
+use dyld::Library;
+
+#[no_mangle]
+pub extern "C" fn malloc(_size: usize) -> *mut libc::c_void {
+    unimplemented!()
+}
+
+#[no_mangle]
+pub extern "C" fn realloc(_ptr: *mut libc::c_void, _size: usize) -> *mut libc::c_void {
+    unimplemented!()
+}
+
+#[no_mangle]
+pub extern "C" fn free(_ptr: *mut libc::c_void) {
+    unimplemented!()
+}
+
+fn send(request: &Message) {
+    unsafe { mailbox::send(request as *const _ as usize) }
+    while !mailbox::acknowledged() {}
+}
+
+fn recv<R, F: FnOnce(&Message) -> R>(f: F) -> R {
+    while mailbox::receive() == 0 {}
+    let result = f(unsafe { mem::transmute::<usize, &Message>(mailbox::receive()) });
+    mailbox::acknowledge();
+    result
+}
+
+macro_rules! recv {
+    ($p:pat => $e:expr) => {
+        recv(|request| {
+            if let $p = request {
+                $e
+            } else {
+                send(&Log(format_args!("unexpected reply: {:?}", request)));
+                loop {}
+            }
+        })
+    }
+}
+
+macro_rules! print {
+    ($($arg:tt)*) => ($crate::send(&$crate::kernel_proto::Log(format_args!($($arg)*))));
+}
+
+macro_rules! println {
+    ($fmt:expr) => (print!(concat!($fmt, "\n")));
+    ($fmt:expr, $($arg:tt)*) => (print!(concat!($fmt, "\n"), $($arg)*));
+}
+
+#[path = "../src/rpc_queue.rs"]
+mod rpc_queue;
+
+#[lang = "panic_fmt"]
+extern fn panic_fmt(args: core::fmt::Arguments, file: &'static str, line: u32) -> ! {
+    println!("panic at {}:{}: {}", file, line, args);
+    send(&RunAborted);
+    loop {}
+}
+
+static mut NOW: u64 = 0;
+
+#[no_mangle]
+pub extern fn send_to_log(ptr: *const u8, len: usize) {
+    send(&LogSlice(unsafe {
+        str::from_utf8_unchecked(slice::from_raw_parts(ptr, len))
+    }))
+}
+
+extern fn abort() -> ! {
+    println!("kernel called abort()");
+    send(&RunAborted);
+    loop {}
+}
+
+extern fn send_rpc(service: u32, tag: *const u8, data: *const *const ()) {
+    extern { fn strlen(s: *const c_char) -> size_t; }
+    let tag = unsafe { slice::from_raw_parts(tag, strlen(tag as *const c_char)) };
+
+    while !rpc_queue::empty() {}
+    send(&RpcSend {
+        async:   false,
+        service: service,
+        tag:     tag,
+        data:    data
+    })
+}
+
+extern fn send_async_rpc(service: u32, tag: *const u8, data: *const *const ()) {
+    extern { fn strlen(s: *const c_char) -> size_t; }
+    let tag = unsafe { slice::from_raw_parts(tag, strlen(tag as *const c_char)) };
+
+    while rpc_queue::full() {}
+    rpc_queue::enqueue(|mut slice| {
+        let length = {
+            let mut writer = Cursor::new(&mut slice[4..]);
+            try!(rpc_proto::send_args(&mut writer, service, tag, data));
+            writer.position()
+        };
+        proto::write_u32(&mut slice, length as u32)
+    }).unwrap_or_else(|err| {
+        assert!(err.kind() == std::io::ErrorKind::WriteZero);
+
+        while !rpc_queue::empty() {}
+        send(&RpcSend {
+            async:   true,
+            service: service,
+            tag:     tag,
+            data:    data
+        })
+    })
+}
+
+extern fn recv_rpc(slot: *mut ()) -> usize {
+    send(&RpcRecvRequest(slot));
+    recv!(&RpcRecvReply(ref result) => {
+        match result {
+            &Ok(alloc_size) => alloc_size,
+            &Err(ref exception) => unsafe { __artiq_raise(exception as *const _) }
+        }
+    })
+}
+
+#[allow(improper_ctypes)]
+extern {
+    fn __artiq_raise(exn: *const ::kernel_proto::Exception) -> !;
+}
+
+macro_rules! artiq_raise {
+    ($name:expr, $message:expr) => ({
+        let exn = Exception {
+            name:     concat!("0:artiq.coredevice.exceptions.", $name, "\0").as_bytes().as_ptr(),
+            file:     concat!(file!(), "\0").as_bytes().as_ptr(),
+            line:     line!(),
+            column:   column!(),
+            // https://github.com/rust-lang/rfcs/pull/1719
+            function: "(Rust function)\0".as_bytes().as_ptr(),
+            message:  concat!($message, "\0").as_bytes().as_ptr(),
+            param:    [0; 3],
+            phantom:  ::core::marker::PhantomData
+        };
+        unsafe { __artiq_raise(&exn as *const _) }
+    })
+}
+
+#[no_mangle]
+pub extern fn __artiq_terminate(exception: *const kernel_proto::Exception,
+                            backtrace_data: *mut usize,
+                            backtrace_size: usize) -> ! {
+    let backtrace = unsafe { slice::from_raw_parts_mut(backtrace_data, backtrace_size) };
+    let mut cursor = 0;
+    for index in 0..backtrace.len() {
+        if backtrace[index] > kernel_proto::KERNELCPU_PAYLOAD_ADDRESS {
+            backtrace[cursor] = backtrace[index] - kernel_proto::KERNELCPU_PAYLOAD_ADDRESS;
+            cursor += 1;
+        }
+    }
+    let backtrace = &mut backtrace[0..cursor];
+
+    send(&NowSave(unsafe { NOW }));
+    send(&RunException {
+        exception: unsafe { (*exception).clone() },
+        backtrace: backtrace
+    });
+    loop {}
+}
+
+extern fn watchdog_set(ms: i64) -> usize {
+    if ms < 0 {
+        artiq_raise!("ValueError", "cannot set a watchdog with a negative timeout")
+    }
+
+    send(&WatchdogSetRequest { ms: ms as u64 });
+    recv!(&WatchdogSetReply { id } => id)
+}
+
+extern fn watchdog_clear(id: usize) {
+    send(&WatchdogClear { id: id })
+}
+
+extern fn cache_get(key: *const u8) -> (usize, *const u32) {
+    extern { fn strlen(s: *const c_char) -> size_t; }
+    let key = unsafe { slice::from_raw_parts(key, strlen(key as *const c_char)) };
+    let key = unsafe { str::from_utf8_unchecked(key) };
+
+    send(&CacheGetRequest { key: key });
+    recv!(&CacheGetReply { value } => (value.len(), value.as_ptr()))
+}
+
+extern fn cache_put(key: *const u8, &(len, ptr): &(usize, *const u32)) {
+    extern { fn strlen(s: *const c_char) -> size_t; }
+    let key = unsafe { slice::from_raw_parts(key, strlen(key as *const c_char)) };
+    let key = unsafe { str::from_utf8_unchecked(key) };
+
+    let value = unsafe { slice::from_raw_parts(ptr, len) };
+    send(&CachePutRequest { key: key, value: value });
+    recv!(&CachePutReply { succeeded } => {
+        if !succeeded {
+            artiq_raise!("CacheError", "cannot put into a busy cache row")
+        }
+    })
+}
+
+unsafe fn attribute_writeback(typeinfo: *const ()) {
+    struct Attr {
+        offset: usize,
+        tag:    *const u8,
+        name:   *const u8
+    }
+
+    struct Type {
+        attributes: *const *const Attr,
+        objects:    *const *const ()
+    }
+
+    let mut tys = typeinfo as *const *const Type;
+    while !(*tys).is_null() {
+        let ty = *tys;
+        tys = tys.offset(1);
+
+        let mut objects = (*ty).objects;
+        while !(*objects).is_null() {
+            let object = *objects;
+            objects = objects.offset(1);
+
+            let mut attributes = (*ty).attributes;
+            while !(*attributes).is_null() {
+                let attribute = *attributes;
+                attributes = attributes.offset(1);
+
+                if !(*attribute).tag.is_null() {
+                    send_async_rpc(0, (*attribute).tag, [
+                        &object as *const _ as *const (),
+                        &(*attribute).name as *const _ as *const (),
+                        (object as usize + (*attribute).offset) as *const ()
+                    ].as_ptr());
+                }
+            }
+        }
+    }
+}
+
+#[no_mangle]
+pub unsafe fn main() {
+    let library = recv!(&LoadRequest(library) => {
+        match Library::load(library, kernel_proto::KERNELCPU_PAYLOAD_ADDRESS, api::resolve) {
+            Err(error) => {
+                send(&LoadReply(Err(error)));
+                loop {}
+            },
+            Ok(library) => {
+                send(&LoadReply(Ok(())));
+                library
+            }
+        }
+    });
+
+    let __bss_start = library.lookup("__bss_start");
+    let _end = library.lookup("_end");
+    ptr::write_bytes(__bss_start as *mut u8, 0, _end - __bss_start);
+
+    send(&NowInitRequest);
+    recv!(&NowInitReply(now) => NOW = now);
+    (mem::transmute::<usize, fn()>(library.lookup("__modinit__")))();
+    send(&NowSave(NOW));
+
+    attribute_writeback(library.lookup("typeinfo") as *const ());
+
+    send(&RunFinished);
+
+    loop {}
+}
+
+#[no_mangle]
+pub fn exception_handler(vect: u32, _regs: *const u32, pc: u32, ea: u32) {
+    println!("exception {:?} at PC 0x{:x}, EA 0x{:x}", vect, pc, ea);
+    send(&RunAborted)
+}

artiq/runtime.rs/liblwip-sys/lib.rs

@@ -103,6 +103,10 @@ pub struct udp_pcb {
 pub const TCP_WRITE_FLAG_COPY: u8 = 0x01;
 pub const TCP_WRITE_FLAG_MORE: u8 = 0x02;
 
+pub const SOF_REUSEADDR: u8 = 0x04;
+pub const SOF_KEEPALIVE: u8 = 0x08;
+pub const SOF_BROADCAST: u8 = 0x20;
+
 extern {
     pub fn pbuf_alloc(l: pbuf_layer, length: u16, type_: pbuf_type) -> *mut pbuf;
     pub fn pbuf_realloc(p: *mut pbuf, length: u16);
@@ -122,28 +126,30 @@ extern {
     pub fn tcp_bind(pcb: *mut tcp_pcb, ipaddr: *mut ip_addr, port: u16) -> err;
     pub fn tcp_listen_with_backlog(pcb: *mut tcp_pcb, backlog: u8) -> *mut tcp_pcb;
     pub fn tcp_accept(pcb: *mut tcp_pcb,
-                      accept: extern fn(arg: *mut c_void, newpcb: *mut tcp_pcb,
-                                        err: err) -> err);
+                      accept: Option<extern fn(arg: *mut c_void, newpcb: *mut tcp_pcb,
+                                               err: err) -> err>);
     pub fn tcp_connect(pcb: *mut tcp_pcb, ipaddr: *mut ip_addr, port: u16,
                        connected: extern fn(arg: *mut c_void, tcb: *mut tcp_pcb, err: err)) -> err;
     pub fn tcp_write(pcb: *mut tcp_pcb, dataptr: *const c_void, len: u16, apiflags: u8) -> err;
     pub fn tcp_sent(pcb: *mut tcp_pcb,
-                    sent: extern fn(arg: *mut c_void, tcb: *mut tcp_pcb, len: u16) -> err);
+                    sent: Option<extern fn(arg: *mut c_void, tcb: *mut tcp_pcb, len: u16) -> err>);
     pub fn tcp_recv(pcb: *mut tcp_pcb,
-                    recv: extern fn(arg: *mut c_void, tcb: *mut tcp_pcb, p: *mut pbuf,
-                                    err: err) -> err);
+                    recv: Option<extern fn(arg: *mut c_void, tcb: *mut tcp_pcb, p: *mut pbuf,
+                                           err: err) -> err>);
     pub fn tcp_recved(pcb: *mut tcp_pcb, len: u16);
     pub fn tcp_poll(pcb: *mut tcp_pcb,
-                    poll: extern fn(arg: *mut c_void, tcb: *mut tcp_pcb),
+                    poll: Option<extern fn(arg: *mut c_void, tcb: *mut tcp_pcb)>,
                     interval: u8);
     pub fn tcp_shutdown(pcb: *mut tcp_pcb, shut_rx: c_int, shut_tx: c_int) -> err;
     pub fn tcp_close(pcb: *mut tcp_pcb) -> err;
     pub fn tcp_abort(pcb: *mut tcp_pcb);
     pub fn tcp_err(pcb: *mut tcp_pcb,
-                   err: extern fn(arg: *mut c_void, err: err));
+                   err: Option<extern fn(arg: *mut c_void, err: err)>);
 
     // nonstandard
     pub fn tcp_sndbuf_(pcb: *mut tcp_pcb) -> u16;
+    pub fn tcp_so_options_(pcb: *mut tcp_pcb) -> *mut u8;
+    pub fn tcp_nagle_disable_(pcb: *mut tcp_pcb);
 
     pub fn udp_new() -> *mut udp_pcb;
     pub fn udp_new_ip_type(type_: ip_addr_type) -> *mut udp_pcb;
@@ -154,7 +160,7 @@ extern {
     pub fn udp_send(pcb: *mut udp_pcb, p: *mut pbuf) -> err;
     pub fn udp_sendto(pcb: *mut udp_pcb, p: *mut pbuf, ipaddr: *mut ip_addr, port: u16) -> err;
     pub fn udp_recv(pcb: *mut udp_pcb,
-                    recv: extern fn(arg: *mut c_void, upcb: *mut udp_pcb, p: *mut pbuf,
-                                    addr: *mut ip_addr, port: u16),
+                    recv: Option<extern fn(arg: *mut c_void, upcb: *mut udp_pcb, p: *mut pbuf,
+                                           addr: *mut ip_addr, port: u16)>,
                     recv_arg: *mut c_void);
 }

artiq/runtime.rs/liblwip/Cargo.toml

@@ -9,4 +9,8 @@ path = "lib.rs"
 
 [dependencies]
 lwip-sys = { path = "../liblwip-sys" }
-std_artiq = { path = "../libstd_artiq" }
+std_artiq = { path = "../libstd_artiq", features = ["alloc"] }
+
+[features]
+default = ["preemption"]
+preemption = []

artiq/runtime.rs/liblwip/lib.rs

@@ -8,7 +8,9 @@ extern crate lwip_sys;
 extern crate std_artiq as std;
 
 use core::marker::PhantomData;
+use core::ptr;
 use core::cell::RefCell;
+use core::fmt;
 use alloc::boxed::Box;
 use collections::LinkedList;
 use libc::c_void;
@@ -32,6 +34,8 @@ pub enum Error {
     ConnectionReset,
     ConnectionClosed,
     IllegalArgument,
+    // Not used by lwip; added for building blocking interfaces.
+    Interrupted
 }
 
 impl Error {
@@ -53,6 +57,7 @@ impl Error {
             Error::ConnectionReset => "connection reset",
             Error::ConnectionClosed => "connection closed",
             Error::IllegalArgument => "illegal argument",
+            Error::Interrupted => "interrupted"
         }
     }
 }
@@ -71,7 +76,12 @@ impl error::Error for Error {
 
 impl From<Error> for std::io::Error {
     fn from(lower: Error) -> std::io::Error {
-        std::io::Error::new(std::io::ErrorKind::Other, lower)
+        use std::io;
+
+        match lower {
+            Error::Interrupted => io::Error::new(io::ErrorKind::Interrupted, "interrupted"),
+            err => io::Error::new(io::ErrorKind::Other, err)
+        }
     }
 }
 
@@ -102,19 +112,54 @@ fn result_from<T, F>(err: lwip_sys::err, f: F) -> Result<T>
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
 pub enum IpAddr {
-    Ip4([u8;  4]),
-    Ip6([u16; 8]),
-    IpAny
+    V4([u8;  4]),
+    V6([u16; 8]),
+    Any
 }
 
-pub const IP4_ANY: IpAddr = IpAddr::Ip4([0, 0, 0, 0]);
-pub const IP6_ANY: IpAddr = IpAddr::Ip6([0, 0, 0, 0, 0, 0, 0, 0]);
-pub const IP_ANY: IpAddr = IpAddr::IpAny;
+pub const IP4_ANY: IpAddr = IpAddr::V4([0, 0, 0, 0]);
+pub const IP6_ANY: IpAddr = IpAddr::V6([0, 0, 0, 0, 0, 0, 0, 0]);
+pub const IP_ANY: IpAddr = IpAddr::Any;
+
+impl fmt::Display for IpAddr {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            IpAddr::V4(ref octets) =>
+                write!(f, "{}.{}.{}.{}", octets[0], octets[1], octets[2], octets[3]),
+
+            IpAddr::V6(ref segments) => {
+                #[derive(Clone, Copy, PartialEq, Eq)]
+                enum State { Head, Skip, Tail };
+
+                let mut state = State::Head;
+                for (idx, &segment) in segments.iter().enumerate() {
+                    match state {
+                        State::Head | State::Skip if segment == 0 =>
+                            state = State::Skip,
+                        State::Skip if segment != 0 => {
+                            state = State::Tail;
+                            try!(write!(f, ":{:x}", segment))
+                        }
+                        _ => try!(write!(f, "{:x}", segment))
+                    }
+
+                    if state != State::Skip && idx != 15 {
+                        try!(write!(f, ":"))
+                    }
+                }
+                Ok(())
+            },
+
+            IpAddr::Any =>
+                write!(f, "*")
+        }
+    }
+}
 
 impl IpAddr {
     fn into_raw(self) -> lwip_sys::ip_addr {
         match self {
-            IpAddr::Ip4(ref octets) =>
+            IpAddr::V4(octets) =>
                 lwip_sys::ip_addr {
                     data:  [(octets[0] as u32) << 24 |
                             (octets[1] as u32) << 16 |
@@ -123,7 +168,7 @@ impl IpAddr {
                             0, 0, 0],
                     type_: lwip_sys::IPADDR_TYPE_V4
                 },
-            IpAddr::Ip6(ref segments) =>
+            IpAddr::V6(segments) =>
                 lwip_sys::ip_addr {
                     data:  [(segments[0] as u32) << 16 | (segments[1] as u32),
                             (segments[2] as u32) << 16 | (segments[3] as u32),
@@ -131,7 +176,7 @@ impl IpAddr {
                             (segments[6] as u32) << 16 | (segments[7] as u32)],
                     type_: lwip_sys::IPADDR_TYPE_V6
                 },
-            IpAddr::IpAny =>
+            IpAddr::Any =>
                 lwip_sys::ip_addr {
                     data:  [0; 4],
                     type_: lwip_sys::IPADDR_TYPE_ANY
@@ -142,17 +187,17 @@ impl IpAddr {
     unsafe fn from_raw(raw: *mut lwip_sys::ip_addr) -> IpAddr {
         match *raw {
             lwip_sys::ip_addr { type_: lwip_sys::IPADDR_TYPE_V4, data } =>
-                IpAddr::Ip4([(data[0] >> 24) as u8,
+                IpAddr::V4([(data[0] >> 24) as u8,
                              (data[0] >> 16) as u8,
                              (data[0] >>  8) as u8,
                              (data[0] >>  0) as u8]),
             lwip_sys::ip_addr { type_: lwip_sys::IPADDR_TYPE_V6, data } =>
-                IpAddr::Ip6([(data[0] >> 16) as u16, data[0] as u16,
+                IpAddr::V6([(data[0] >> 16) as u16, data[0] as u16,
                              (data[1] >> 16) as u16, data[1] as u16,
                              (data[2] >> 16) as u16, data[2] as u16,
                              (data[3] >> 16) as u16, data[3] as u16]),
             lwip_sys::ip_addr { type_: lwip_sys::IPADDR_TYPE_ANY, .. } =>
-                IpAddr::IpAny
+                IpAddr::Any
         }
     }
 }
@@ -163,6 +208,12 @@ pub struct SocketAddr {
     pub port: u16
 }
 
+impl fmt::Display for SocketAddr {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}:{}", self.ip, self.port)
+    }
+}
+
 impl SocketAddr {
     pub fn new(ip: IpAddr, port: u16) -> SocketAddr {
         SocketAddr { ip: ip, port: port }
@@ -175,6 +226,9 @@ pub struct Pbuf<'payload> {
     phantom: PhantomData<&'payload [u8]>
 }
 
+#[cfg(not(feature = "preemption"))]
+unsafe impl<'payload> Send for Pbuf<'payload> {}
+
 impl<'payload> Pbuf<'payload> {
     unsafe fn from_raw(raw: *mut lwip_sys::pbuf) -> Pbuf<'payload> {
         Pbuf { raw: raw, phantom: PhantomData }
@@ -259,6 +313,9 @@ pub struct UdpSocket {
     state: Box<RefCell<UdpSocketState>>
 }
 
+#[cfg(not(feature = "preemption"))]
+unsafe impl Send for UdpSocket {}
+
 impl UdpSocket {
     pub fn new() -> Result<UdpSocket> {
         extern fn recv(arg: *mut c_void, _pcb: *mut lwip_sys::udp_pcb,
@@ -279,12 +336,12 @@ impl UdpSocket {
                 recv_buffer: LinkedList::new()
             }));
             let arg = &mut *state as *mut RefCell<UdpSocketState> as *mut _;
-            lwip_sys::udp_recv(raw, recv, arg);
+            lwip_sys::udp_recv(raw, Some(recv), arg);
             Ok(UdpSocket { raw: raw, state: state })
         }
     }
 
-    pub fn state(&self) -> *const RefCell<UdpSocketState> {
+    pub fn state(&self) -> &RefCell<UdpSocketState> {
         &*self.state
     }
 
@@ -347,6 +404,9 @@ pub struct TcpListener {
     state: Box<RefCell<TcpListenerState>>
 }
 
+#[cfg(not(feature = "preemption"))]
+unsafe impl Send for TcpListener {}
+
 impl TcpListener {
     pub fn bind(addr: SocketAddr) -> Result<TcpListener> {
         extern fn accept(arg: *mut c_void, newpcb: *mut lwip_sys::tcp_pcb,
@@ -376,18 +436,30 @@ impl TcpListener {
             }));
             let arg = &mut *state as *mut RefCell<TcpListenerState> as *mut _;
             lwip_sys::tcp_arg(raw2, arg);
-            lwip_sys::tcp_accept(raw2, accept);
+            lwip_sys::tcp_accept(raw2, Some(accept));
             Ok(TcpListener { raw: raw2, state: state })
         }
     }
 
-    pub fn state(&self) -> *const RefCell<TcpListenerState> {
+    pub fn state(&self) -> &RefCell<TcpListenerState> {
         &*self.state
     }
 
     pub fn try_accept(&self) -> Option<TcpStream> {
         self.state.borrow_mut().backlog.pop_front()
     }
+
+    pub fn keepalive(&self) -> bool {
+        unsafe { *lwip_sys::tcp_so_options_(self.raw) & lwip_sys::SOF_KEEPALIVE != 0 }
+    }
+
+    pub fn set_keepalive(&self, keepalive: bool) {
+        if keepalive {
+            unsafe { *lwip_sys::tcp_so_options_(self.raw) |= lwip_sys::SOF_KEEPALIVE }
+        } else {
+            unsafe { *lwip_sys::tcp_so_options_(self.raw) &= !lwip_sys::SOF_KEEPALIVE }
+        }
+    }
 }
 
 impl Drop for TcpListener {
@@ -409,7 +481,8 @@ pub enum Shutdown {
 #[derive(Debug)]
 pub struct TcpStreamState {
     recv_buffer: LinkedList<Result<Pbuf<'static>>>,
-    send_avail:  usize
+    send_avail:  usize,
+    total_sent:  usize
 }
 
 impl TcpStreamState {
@@ -428,6 +501,9 @@ pub struct TcpStream {
     state: Box<RefCell<TcpStreamState>>
 }
 
+#[cfg(not(feature = "preemption"))]
+unsafe impl Send for TcpStream {}
+
 impl TcpStream {
     fn from_raw(raw: *mut lwip_sys::tcp_pcb) -> TcpStream {
         extern fn recv(arg: *mut c_void, _raw: *mut lwip_sys::tcp_pcb,
@@ -445,10 +521,12 @@ impl TcpStream {
         }
 
         extern fn sent(arg: *mut c_void, raw: *mut lwip_sys::tcp_pcb,
-                       _len: u16) -> lwip_sys::err {
+                       len: u16) -> lwip_sys::err {
             unsafe {
                 let state = arg as *mut RefCell<TcpStreamState>;
-                (*state).borrow_mut().send_avail = lwip_sys::tcp_sndbuf_(raw) as usize;
+                let mut state = (*state).borrow_mut();
+                state.send_avail = lwip_sys::tcp_sndbuf_(raw) as usize;
+                state.total_sent = state.total_sent.wrapping_add(len as usize);
             }
             lwip_sys::ERR_OK
         }
@@ -463,37 +541,56 @@ impl TcpStream {
         unsafe {
             let mut state = Box::new(RefCell::new(TcpStreamState {
                 recv_buffer: LinkedList::new(),
-                send_avail:  lwip_sys::tcp_sndbuf_(raw) as usize
+                send_avail: lwip_sys::tcp_sndbuf_(raw) as usize,
+                total_sent: 0
             }));
             let arg = &mut *state as *mut RefCell<TcpStreamState> as *mut _;
             lwip_sys::tcp_arg(raw, arg);
-            lwip_sys::tcp_recv(raw, recv);
-            lwip_sys::tcp_sent(raw, sent);
-            lwip_sys::tcp_err(raw, err);
+            lwip_sys::tcp_recv(raw, Some(recv));
+            lwip_sys::tcp_sent(raw, Some(sent));
+            lwip_sys::tcp_err(raw, Some(err));
+            lwip_sys::tcp_nagle_disable_(raw);
             TcpStream { raw: raw, state: state }
         }
     }
 
-    pub fn state(&self) -> *const RefCell<TcpStreamState> {
+    pub fn state(&self) -> &RefCell<TcpStreamState> {
         &*self.state
     }
 
-    pub fn write(&self, data: &[u8]) -> Result<usize> {
-        let sndbuf = unsafe { lwip_sys::tcp_sndbuf_(self.raw) } as usize;
+    unsafe fn write_common(&self, data: &[u8], copy: bool) -> Result<usize> {
+        let sndbuf = lwip_sys::tcp_sndbuf_(self.raw) as usize;
         let len = if data.len() < sndbuf { data.len() } else { sndbuf };
-        let result = result_from(unsafe {
+        let result = result_from({
             lwip_sys::tcp_write(self.raw, data as *const [u8] as *const _, len as u16,
-                                lwip_sys::TCP_WRITE_FLAG_COPY |
-                                lwip_sys::TCP_WRITE_FLAG_MORE)
+                                lwip_sys::TCP_WRITE_FLAG_MORE |
+                                if copy { lwip_sys::TCP_WRITE_FLAG_COPY } else { 0 })
         }, || len);
-        self.state.borrow_mut().send_avail = unsafe { lwip_sys::tcp_sndbuf_(self.raw) } as usize;
+        self.state.borrow_mut().send_avail = lwip_sys::tcp_sndbuf_(self.raw) as usize;
         result
     }
 
+    pub fn write(&self, data: &[u8]) -> Result<usize> {
+        unsafe { self.write_common(data, true) }
+    }
+
+    pub fn write_in_place<F>(&self, data: &[u8], mut relinquish: F) -> Result<usize>
+            where F: FnMut() -> Result<()> {
+        let cursor = self.state.borrow().total_sent;
+        let written = try!(unsafe { self.write_common(data, false) });
+        loop {
+            let cursor_now = self.state.borrow().total_sent;
+            if cursor_now >= cursor.wrapping_add(written) {
+                return Ok(written)
+            } else {
+                try!(relinquish())
+            }
+        }
+    }
+
     pub fn flush(&self) -> Result<()> {
-        const EMPTY_DATA: [u8; 0] = [];
         result_from(unsafe {
-            lwip_sys::tcp_write(self.raw, &EMPTY_DATA as *const [u8] as *const _, 0, 0)
+            lwip_sys::tcp_write(self.raw, ptr::null(), 0, 0)
         }, || ())
     }
 
@@ -505,7 +602,10 @@ impl TcpStream {
             Some(_) => ()
         }
         match state.recv_buffer.pop_front() {
-            Some(Ok(pbuf)) => return Ok(Some(pbuf)),
+            Some(Ok(pbuf)) => {
+                unsafe { lwip_sys::tcp_recved(self.raw, pbuf.len() as u16) }
+                return Ok(Some(pbuf))
+            },
             _ => unreachable!()
         }
     }
@@ -533,6 +633,11 @@ impl TcpStream {
 impl Drop for TcpStream {
     fn drop(&mut self) {
         unsafe {
+            // lwip *will* try to call back after tcp_close
+            lwip_sys::tcp_recv(self.raw, None);
+            lwip_sys::tcp_sent(self.raw, None);
+            lwip_sys::tcp_err(self.raw, None);
+
             // tcp_close can fail here, but in drop() we don't care
             let _ = lwip_sys::tcp_close(self.raw);
         }

artiq/runtime.rs/libstd_artiq/Cargo.toml

@@ -9,3 +9,6 @@ path = "lib.rs"
 
 [dependencies]
 alloc_artiq = { path = "../liballoc_artiq" }
+
+[features]
+alloc = []

artiq/runtime.rs/libstd_artiq/io/buffered.rs

@@ -17,6 +17,8 @@ use core::cmp;
 use core::fmt;
 use io::{self, DEFAULT_BUF_SIZE, Error, ErrorKind, SeekFrom};
 use io::memchr;
+use alloc::boxed::Box;
+use collections::vec::Vec;
 
 /// The `BufReader` struct adds buffering to any reader.
 ///

artiq/runtime.rs/libstd_artiq/io/cursor.rs

@@ -13,6 +13,8 @@ use io::prelude::*;
 
 use core::cmp;
 use io::{self, SeekFrom, Error, ErrorKind};
+use alloc::boxed::Box;
+use collections::vec::Vec;
 
 /// A `Cursor` wraps another type and provides it with a
 /// [`Seek`](trait.Seek.html) implementation.

artiq/runtime.rs/libstd_artiq/io/error.rs

@@ -8,7 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
- use alloc::boxed::Box;
+#[cfg(feature="alloc")] use alloc::boxed::Box;
+#[cfg(not(feature="alloc"))] use ::FakeBox as Box;
 use core::convert::Into;
 use core::fmt;
 use core::marker::{Send, Sync};
@@ -62,13 +63,19 @@ pub struct Error {
 enum Repr {
     Os(i32),
 
+    #[cfg(feature="alloc")]
     Custom(Box<Custom>),
+    #[cfg(not(feature="alloc"))]
+    Custom(Custom),
 }
 
 #[derive(Debug)]
 struct Custom {
     kind: ErrorKind,
+    #[cfg(feature="alloc")]
     error: Box<error::Error+Send+Sync>,
+    #[cfg(not(feature="alloc"))]
+    error: &'static str
 }
 
 /// A list specifying general categories of I/O error.
@@ -162,12 +169,21 @@ impl Error {
     /// // errors can also be created from other errors
     /// let custom_error2 = Error::new(ErrorKind::Interrupted, custom_error);
     /// ```
+    #[cfg(feature="alloc")]
     pub fn new<E>(kind: ErrorKind, error: E) -> Error
         where E: Into<Box<error::Error+Send+Sync>>
     {
         Self::_new(kind, error.into())
     }
 
+    #[cfg(not(feature="alloc"))]
+    pub fn new<E>(kind: ErrorKind, error: E) -> Error
+        where E: Into<&'static str>
+    {
+        Self::_new(kind, error.into())
+    }
+
+    #[cfg(feature="alloc")]
     fn _new(kind: ErrorKind, error: Box<error::Error+Send+Sync>) -> Error {
         Error {
             repr: Repr::Custom(Box::new(Custom {
@@ -177,6 +193,16 @@ impl Error {
         }
     }
 
+    #[cfg(not(feature="alloc"))]
+    fn _new(kind: ErrorKind, error: &'static str) -> Error {
+        Error {
+            repr: Repr::Custom(Box::new(Custom {
+                kind: kind,
+                error: error,
+            }))
+        }
+    }
+
     /// Creates a new instance of an `Error` from a particular OS error code.
     pub fn from_raw_os_error(code: i32) -> Error {
         Error { repr: Repr::Os(code) }
@@ -198,6 +224,7 @@ impl Error {
     ///
     /// If this `Error` was constructed via `new` then this function will
     /// return `Some`, otherwise it will return `None`.
+    #[cfg(feature="alloc")]
     pub fn get_ref(&self) -> Option<&(error::Error+Send+Sync+'static)> {
         match self.repr {
             Repr::Os(..) => None,
@@ -210,6 +237,7 @@ impl Error {
     ///
     /// If this `Error` was constructed via `new` then this function will
     /// return `Some`, otherwise it will return `None`.
+    #[cfg(feature="alloc")]
     pub fn get_mut(&mut self) -> Option<&mut (error::Error+Send+Sync+'static)> {
         match self.repr {
             Repr::Os(..) => None,
@@ -221,6 +249,7 @@ impl Error {
     ///
     /// If this `Error` was constructed via `new` then this function will
     /// return `Some`, otherwise it will return `None`.
+    #[cfg(feature="alloc")]
     pub fn into_inner(self) -> Option<Box<error::Error+Send+Sync>> {
         match self.repr {
             Repr::Os(..) => None,
@@ -282,14 +311,24 @@ impl error::Error for Error {
                 ErrorKind::UnexpectedEof => "unexpected end of file",
                 ErrorKind::__Nonexhaustive => unreachable!()
             },
-            Repr::Custom(ref c) => c.error.description(),
+            Repr::Custom(ref c) => {
+                #[cfg(feature="alloc")]
+                { c.error.description() }
+                #[cfg(not(feature="alloc"))]
+                { c.error }
+            },
         }
     }
 
     fn cause(&self) -> Option<&error::Error> {
         match self.repr {
             Repr::Os(..) => None,
-            Repr::Custom(ref c) => c.error.cause(),
+            Repr::Custom(ref _c) => {
+                #[cfg(feature="alloc")]
+                { _c.error.cause() }
+                #[cfg(not(feature="alloc"))]
+                { None }
+            }
         }
     }
 }

artiq/runtime.rs/libstd_artiq/io/prelude.rs

@@ -20,6 +20,3 @@
 
 pub use super::{Read, Write, Seek};
  pub use super::BufRead;
-
- pub use alloc::boxed::Box;
- pub use collections::vec::Vec;

artiq/runtime.rs/libstd_artiq/lib.rs

@@ -1,6 +1,7 @@
 #![feature(lang_items, asm, alloc, collections, libc, needs_panic_runtime,
            question_mark, unicode, reflect_marker, raw, int_error_internals,
-           try_from, try_borrow)]
+           try_from, try_borrow, macro_reexport, allow_internal_unstable,
+           stmt_expr_attributes)]
 #![no_std]
 #![needs_panic_runtime]
 
@@ -8,6 +9,7 @@ extern crate rustc_unicode;
 extern crate alloc_artiq;
 extern crate alloc;
 #[macro_use]
+#[macro_reexport(vec, format)]
 extern crate collections;
 extern crate libc;
 
@@ -21,62 +23,22 @@ pub use collections::{binary_heap, borrow, boxed, btree_map, btree_set, fmt, lin
 pub mod prelude {
     pub mod v1 {
         pub use core::prelude::v1::*;
-        pub use collections::*;
-        pub use io::{Read, Write, Seek};
-        pub use io::BufRead;
+        pub use collections::boxed::Box;
+        pub use collections::borrow::ToOwned;
+        pub use collections::string::{String, ToString};
+        pub use collections::vec::Vec;
     }
 }
 
-pub mod time;
 pub mod error;
 pub mod io;
 
-use core::fmt::Write;
-
-#[macro_export]
-macro_rules! print {
-    ($($arg:tt)*) => ($crate::print_fmt(format_args!($($arg)*)));
-}
-
-#[macro_export]
-macro_rules! println {
-    ($fmt:expr) => (print!(concat!($fmt, "\n")));
-    ($fmt:expr, $($arg:tt)*) => (print!(concat!($fmt, "\n"), $($arg)*));
-}
-
-extern {
-    fn putchar(c: libc::c_int) -> libc::c_int;
-    fn readchar() -> libc::c_char;
-}
-
-pub struct Console;
-
-impl core::fmt::Write for Console {
-    fn write_str(&mut self, s: &str) -> Result<(), core::fmt::Error> {
-        for c in s.bytes() { unsafe { putchar(c as i32); } }
-        Ok(())
+// Provide Box::new wrapper
+#[cfg(not(feature="alloc"))]
+struct FakeBox<T>(core::marker::PhantomData<T>);
+#[cfg(not(feature="alloc"))]
+impl<T> FakeBox<T> {
+    fn new(val: T) -> T {
+        val
     }
 }
-
-pub fn print_fmt(args: self::core::fmt::Arguments) {
-    let _ = Console.write_fmt(args);
-}
-
-#[lang = "panic_fmt"]
-extern fn panic_fmt(args: self::core::fmt::Arguments, file: &'static str, line: u32) -> ! {
-    let _ = write!(Console, "panic at {}:{}: ", file, line);
-    let _ = Console.write_fmt(args);
-    let _ = write!(Console, "\nwaiting for debugger...\n");
-    unsafe {
-        let _ = readchar();
-        loop { asm!("l.trap 0") }
-    }
-}
-
-// Allow linking with crates that are built as -Cpanic=unwind even when the root crate
-// is built with -Cpanic=abort.
-#[allow(non_snake_case)]
-#[no_mangle]
-pub extern "C" fn _Unwind_Resume() -> ! {
-    loop {}
-}

artiq/runtime.rs/libstd_artiq/time/duration.rs

@@ -1,117 +0,0 @@
-use core::ops::{Add, Sub, Mul, Div};
-
-const MILLIS_PER_SEC: u64 = 1_000;
-const NANOS_PER_MILLI: u32 = 1_000_000;
-
-/// A duration type to represent a span of time, typically used for system
-/// timeouts.
-///
-/// Each duration is composed of a number of seconds and nanosecond precision.
-/// APIs binding a system timeout will typically round up the nanosecond
-/// precision if the underlying system does not support that level of precision.
-///
-/// Durations implement many common traits, including `Add`, `Sub`, and other
-/// ops traits. Currently a duration may only be inspected for its number of
-/// seconds and its nanosecond precision.
-///
-/// # Examples
-///
-/// ```
-/// use std::time::Duration;
-///
-/// let five_seconds = Duration::new(5, 0);
-/// let five_seconds_and_five_nanos = five_seconds + Duration::new(0, 5);
-///
-/// assert_eq!(five_seconds_and_five_nanos.as_secs(), 5);
-/// assert_eq!(five_seconds_and_five_nanos.subsec_nanos(), 5);
-///
-/// let ten_millis = Duration::from_millis(10);
-/// ```
-#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
-pub struct Duration {
-    millis: u64
-}
-
-impl Duration {
-    /// Creates a new `Duration` from the specified number of seconds and
-    /// additional nanosecond precision.
-    ///
-    /// If the nanoseconds is greater than 1 billion (the number of nanoseconds
-    /// in a second), then it will carry over into the seconds provided.
-    pub fn new(secs: u64, nanos: u32) -> Duration {
-        Duration { millis: secs * MILLIS_PER_SEC + (nanos / NANOS_PER_MILLI) as u64 }
-    }
-
-    /// Creates a new `Duration` from the specified number of seconds.
-    pub fn from_secs(secs: u64) -> Duration {
-        Duration { millis: secs * MILLIS_PER_SEC }
-    }
-
-    /// Creates a new `Duration` from the specified number of milliseconds.
-    pub fn from_millis(millis: u64) -> Duration {
-        Duration { millis: millis }
-    }
-
-    /// Returns the number of whole milliseconds represented by this duration.
-    pub fn as_millis(&self) -> u64 { self.millis }
-
-    /// Returns the number of whole seconds represented by this duration.
-    ///
-    /// The extra precision represented by this duration is ignored (e.g. extra
-    /// nanoseconds are not represented in the returned value).
-    pub fn as_secs(&self) -> u64 {
-        self.millis / MILLIS_PER_SEC
-    }
-
-    /// Returns the nanosecond precision represented by this duration.
-    ///
-    /// This method does **not** return the length of the duration when
-    /// represented by nanoseconds. The returned number always represents a
-    /// fractional portion of a second (e.g. it is less than one billion).
-    pub fn subsec_nanos(&self) -> u32 {
-        (self.millis % MILLIS_PER_SEC) as u32 * NANOS_PER_MILLI
-    }
-}
-
-impl Add for Duration {
-    type Output = Duration;
-
-    fn add(self, rhs: Duration) -> Duration {
-        Duration {
-            millis: self.millis.checked_add(rhs.millis)
-                               .expect("overflow when adding durations")
-        }
-    }
-}
-
-impl Sub for Duration {
-    type Output = Duration;
-
-    fn sub(self, rhs: Duration) -> Duration {
-        Duration {
-            millis: self.millis.checked_sub(rhs.millis)
-                               .expect("overflow when subtracting durations")
-        }
-    }
-}
-
-impl Mul<u32> for Duration {
-    type Output = Duration;
-
-    fn mul(self, rhs: u32) -> Duration {
-        Duration {
-            millis: self.millis.checked_mul(rhs as u64)
-                               .expect("overflow when multiplying duration")
-        }
-    }
-}
-
-impl Div<u32> for Duration {
-    type Output = Duration;
-
-    fn div(self, rhs: u32) -> Duration {
-        Duration {
-            millis: self.millis / (rhs as u64)
-        }
-    }
-}

artiq/runtime.rs/libstd_artiq/time/instant.rs

@@ -1,81 +0,0 @@
-use core::ops::{Add, Sub};
-use time::duration::Duration;
-
-/// A measurement of a monotonically increasing clock.
-///
-/// Instants are always guaranteed to be greater than any previously measured
-/// instant when created, and are often useful for tasks such as measuring
-/// benchmarks or timing how long an operation takes.
-///
-/// Note, however, that instants are not guaranteed to be **steady**.  In other
-/// words, each tick of the underlying clock may not be the same length (e.g.
-/// some seconds may be longer than others). An instant may jump forwards or
-/// experience time dilation (slow down or speed up), but it will never go
-/// backwards.
-///
-/// Instants are opaque types that can only be compared to one another. There is
-/// no method to get "the number of seconds" from an instant. Instead, it only
-/// allows measuring the duration between two instants (or comparing two
-/// instants).
-#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
-pub struct Instant {
-    millis: u64
-}
-
-impl Instant {
-    /// Returns an instant corresponding to "now".
-    pub fn now() -> Instant {
-        extern {
-            fn clock_get_ms() -> i64;
-        }
-
-        Instant { millis: unsafe { clock_get_ms() as u64 } }
-    }
-
-    /// Returns the amount of time elapsed from another instant to this one.
-    ///
-    /// # Panics
-    ///
-    /// This function will panic if `earlier` is later than `self`, which should
-    /// only be possible if `earlier` was created after `self`. Because
-    /// `Instant` is monotonic, the only time that this should happen should be
-    /// a bug.
-    pub fn duration_from_earlier(&self, earlier: Instant) -> Duration {
-        let millis = self.millis.checked_sub(earlier.millis)
-                                .expect("`earlier` is later than `self`");
-        Duration::from_millis(millis)
-    }
-
-    /// Returns the amount of time elapsed since this instant was created.
-    ///
-    /// # Panics
-    ///
-    /// This function may panic if the current time is earlier than this
-    /// instant, which is something that can happen if an `Instant` is
-    /// produced synthetically.
-    pub fn elapsed(&self) -> Duration {
-        Instant::now().duration_from_earlier(*self)
-    }
-}
-
-impl Add<Duration> for Instant {
-    type Output = Instant;
-
-    fn add(self, other: Duration) -> Instant {
-        Instant {
-            millis: self.millis.checked_add(other.as_millis())
-                               .expect("overflow when adding duration to instant")
-        }
-    }
-}
-
-impl Sub<Duration> for Instant {
-    type Output = Instant;
-
-    fn sub(self, other: Duration) -> Instant {
-        Instant {
-            millis: self.millis.checked_sub(other.as_millis())
-                               .expect("overflow when subtracting duration from instant")
-        }
-    }
-}

artiq/runtime.rs/libstd_artiq/time/mod.rs

@@ -1,5 +0,0 @@
-pub use self::duration::Duration;
-pub use self::instant::Instant;
-
-mod duration;
-mod instant;

artiq/runtime.rs/src/analyzer.rs

@@ -0,0 +1,92 @@
+use std::io::{self, Write};
+use board::{self, csr};
+use sched::{Waiter, Spawner};
+use sched::{TcpListener, TcpStream, SocketAddr, IP_ANY};
+use analyzer_proto::*;
+
+const BUFFER_SIZE: usize = 512 * 1024;
+
+// hack until https://github.com/rust-lang/rust/issues/33626 is fixed
+#[repr(simd)]
+struct Align64(u64, u64, u64, u64, u64, u64, u64, u64);
+
+struct Buffer {
+    data: [u8; BUFFER_SIZE],
+    __alignment: [Align64; 0]
+}
+
+static mut BUFFER: Buffer = Buffer {
+    data: [0; BUFFER_SIZE],
+    __alignment: []
+};
+
+fn arm() {
+    unsafe {
+        let base_addr = &mut BUFFER.data[0] as *mut _ as usize;
+        let last_addr = &mut BUFFER.data[BUFFER_SIZE - 1] as *mut _ as usize;
+        csr::rtio_analyzer::message_encoder_overflow_reset_write(1);
+        csr::rtio_analyzer::dma_base_address_write(base_addr as u64);
+        csr::rtio_analyzer::dma_last_address_write(last_addr as u64);
+        csr::rtio_analyzer::dma_reset_write(1);
+        csr::rtio_analyzer::enable_write(1);
+    }
+}
+
+fn disarm() {
+    unsafe {
+        csr::rtio_analyzer::enable_write(0);
+        while csr::rtio_analyzer::busy_read() != 0 {}
+        board::flush_cpu_dcache();
+        board::flush_l2_cache();
+    }
+}
+
+fn worker(mut stream: TcpStream) -> io::Result<()> {
+    let data = unsafe { &BUFFER.data[..] };
+    let overflow_occurred = unsafe { csr::rtio_analyzer::message_encoder_overflow_read() != 0 };
+    let total_byte_count = unsafe { csr::rtio_analyzer::dma_byte_count_read() };
+    let pointer = (total_byte_count % BUFFER_SIZE as u64) as usize;
+    let wraparound = total_byte_count >= BUFFER_SIZE as u64;
+
+    let header = Header {
+        total_byte_count: total_byte_count,
+        sent_bytes: if wraparound { BUFFER_SIZE as u32 } else { total_byte_count as u32 },
+        overflow_occurred: overflow_occurred,
+        log_channel: csr::CONFIG_RTIO_LOG_CHANNEL as u8,
+        dds_onehot_sel: csr::CONFIG_DDS_ONEHOT_SEL != 0
+    };
+    trace!("{:?}", header);
+
+    try!(header.write_to(&mut stream));
+    if wraparound {
+        try!(stream.write(&data[pointer..]));
+        try!(stream.write(&data[..pointer]));
+    } else {
+        try!(stream.write(&data[..pointer]));
+    }
+
+    Ok(())
+}
+
+pub fn thread(waiter: Waiter, _spawner: Spawner) {
+    // verify that the hack above works
+    assert!(::core::mem::align_of::<Buffer>() == 64);
+
+    let addr = SocketAddr::new(IP_ANY, 1382);
+    let listener = TcpListener::bind(waiter, addr).expect("cannot bind socket");
+    listener.set_keepalive(true);
+
+    loop {
+        arm();
+
+        let (stream, addr) = listener.accept().expect("cannot accept client");
+        info!("connection from {}", addr);
+
+        disarm();
+
+        match worker(stream) {
+            Ok(())   => (),
+            Err(err) => error!("analyzer aborted: {}", err)
+        }
+    }
+}

artiq/runtime.rs/src/analyzer_proto.rs

@@ -0,0 +1,22 @@
+use std::io::{self, Write};
+use proto::*;
+
+#[derive(Debug)]
+pub struct Header {
+    pub sent_bytes: u32,
+    pub total_byte_count: u64,
+    pub overflow_occurred: bool,
+    pub log_channel: u8,
+    pub dds_onehot_sel: bool
+}
+
+impl Header {
+    pub fn write_to(&self, writer: &mut Write) -> io::Result<()> {
+        try!(write_u32(writer, self.sent_bytes));
+        try!(write_u64(writer, self.total_byte_count));
+        try!(write_u8(writer, self.overflow_occurred as u8));
+        try!(write_u8(writer, self.log_channel));
+        try!(write_u8(writer, self.dds_onehot_sel as u8));
+        Ok(())
+    }
+}

artiq/runtime.rs/src/board.rs

@@ -0,0 +1,145 @@
+#![allow(dead_code)]
+
+use core::{cmp, ptr, str};
+
+include!(concat!(env!("BUILDINC_DIRECTORY"), "/generated/mem.rs"));
+include!(concat!(env!("BUILDINC_DIRECTORY"), "/generated/csr.rs"));
+
+pub mod spr {
+    pub unsafe fn mfspr(reg: u32) -> u32 {
+        let value: u32;
+        asm!("l.mfspr $0, $1, 0" : "=r"(value) : "r"(reg) : : "volatile");
+        value
+    }
+
+    pub unsafe fn mtspr(reg: u32, value: u32) {
+        asm!("l.mtspr $0, $1, 0" : : "r"(reg), "r"(value) : : "volatile")
+    }
+
+    /* Definition of special-purpose registers (SPRs). */
+
+    pub const MAX_GRPS:         u32 = 32;
+    pub const MAX_SPRS_PER_GRP_BITS: u32 = 11;
+    pub const MAX_SPRS_PER_GRP: u32 = 1 << MAX_SPRS_PER_GRP_BITS;
+    pub const MAX_SPRS:         u32 = 0x10000;
+
+    /* Base addresses for the groups */
+    pub const SPRGROUP_SYS:     u32 = 0 << MAX_SPRS_PER_GRP_BITS;
+    pub const SPRGROUP_DMMU:    u32 = 1 << MAX_SPRS_PER_GRP_BITS;
+    pub const SPRGROUP_IMMU:    u32 = 2 << MAX_SPRS_PER_GRP_BITS;
+    pub const SPRGROUP_DC:      u32 = 3 << MAX_SPRS_PER_GRP_BITS;
+    pub const SPRGROUP_IC:      u32 = 4 << MAX_SPRS_PER_GRP_BITS;
+    pub const SPRGROUP_MAC:     u32 = 5 << MAX_SPRS_PER_GRP_BITS;
+    pub const SPRGROUP_D:       u32 = 6 << MAX_SPRS_PER_GRP_BITS;
+    pub const SPRGROUP_PC:      u32 = 7 << MAX_SPRS_PER_GRP_BITS;
+    pub const SPRGROUP_PM:      u32 = 8 << MAX_SPRS_PER_GRP_BITS;
+    pub const SPRGROUP_PIC:     u32 = 9 << MAX_SPRS_PER_GRP_BITS;
+    pub const SPRGROUP_TT:      u32 = 10 << MAX_SPRS_PER_GRP_BITS;
+    pub const SPRGROUP_FP:      u32 = 11 << MAX_SPRS_PER_GRP_BITS;
+
+    /* System control and status group */
+    pub const SPR_VR:           u32 = SPRGROUP_SYS + 0;
+    pub const SPR_UPR:          u32 = SPRGROUP_SYS + 1;
+    pub const SPR_CPUCFGR:      u32 = SPRGROUP_SYS + 2;
+    pub const SPR_DMMUCFGR:     u32 = SPRGROUP_SYS + 3;
+    pub const SPR_IMMUCFGR:     u32 = SPRGROUP_SYS + 4;
+    pub const SPR_DCCFGR:       u32 = SPRGROUP_SYS + 5;
+    pub const SPR_ICCFGR:       u32 = SPRGROUP_SYS + 6;
+    pub const SPR_DCFGR:        u32 = SPRGROUP_SYS + 7;
+    pub const SPR_PCCFGR:       u32 = SPRGROUP_SYS + 8;
+    pub const SPR_VR2:          u32 = SPRGROUP_SYS + 9;
+    pub const SPR_AVR:          u32 = SPRGROUP_SYS + 10;
+    pub const SPR_EVBAR:        u32 = SPRGROUP_SYS + 11;
+    pub const SPR_AECR:         u32 = SPRGROUP_SYS + 12;
+    pub const SPR_AESR:         u32 = SPRGROUP_SYS + 13;
+    pub const SPR_NPC:          u32 = SPRGROUP_SYS + 16;  /* CZ 21/06/01 */
+    pub const SPR_SR:           u32 = SPRGROUP_SYS + 17;  /* CZ 21/06/01 */
+    pub const SPR_PPC:          u32 = SPRGROUP_SYS + 18;  /* CZ 21/06/01 */
+    pub const SPR_FPCSR:        u32 = SPRGROUP_SYS + 20;  /* CZ 21/06/01 */
+    pub const SPR_ISR_BASE:     u32 = SPRGROUP_SYS + 21;
+    pub const SPR_EPCR_BASE:    u32 = SPRGROUP_SYS + 32;  /* CZ 21/06/01 */
+    pub const SPR_EPCR_LAST:    u32 = SPRGROUP_SYS + 47;  /* CZ 21/06/01 */
+    pub const SPR_EEAR_BASE:    u32 = SPRGROUP_SYS + 48;
+    pub const SPR_EEAR_LAST:    u32 = SPRGROUP_SYS + 63;
+    pub const SPR_ESR_BASE:     u32 = SPRGROUP_SYS + 64;
+    pub const SPR_ESR_LAST:     u32 = SPRGROUP_SYS + 79;
+    pub const SPR_GPR_BASE:     u32 = SPRGROUP_SYS + 1024;
+
+    // [snip]
+
+    /* PIC group */
+    pub const SPR_PICMR:        u32 = SPRGROUP_PIC + 0;
+    pub const SPR_PICPR:        u32 = SPRGROUP_PIC + 1;
+    pub const SPR_PICSR:        u32 = SPRGROUP_PIC + 2;
+
+    // [snip]
+
+    /*
+     * Bit definitions for the Supervision Register
+     *
+     */
+    pub const SPR_SR_SM:        u32 = 0x00000001;  /* Supervisor Mode */
+    pub const SPR_SR_TEE:       u32 = 0x00000002;  /* Tick timer Exception Enable */
+    pub const SPR_SR_IEE:       u32 = 0x00000004;  /* Interrupt Exception Enable */
+    pub const SPR_SR_DCE:       u32 = 0x00000008;  /* Data Cache Enable */
+    pub const SPR_SR_ICE:       u32 = 0x00000010;  /* Instruction Cache Enable */
+    pub const SPR_SR_DME:       u32 = 0x00000020;  /* Data MMU Enable */
+    pub const SPR_SR_IME:       u32 = 0x00000040;  /* Instruction MMU Enable */
+    pub const SPR_SR_LEE:       u32 = 0x00000080;  /* Little Endian Enable */
+    pub const SPR_SR_CE:        u32 = 0x00000100;  /* CID Enable */
+    pub const SPR_SR_F:         u32 = 0x00000200;  /* Condition Flag */
+    pub const SPR_SR_CY:        u32 = 0x00000400;  /* Carry flag */
+    pub const SPR_SR_OV:        u32 = 0x00000800;  /* Overflow flag */
+    pub const SPR_SR_OVE:       u32 = 0x00001000;  /* Overflow flag Exception */
+    pub const SPR_SR_DSX:       u32 = 0x00002000;  /* Delay Slot Exception */
+    pub const SPR_SR_EPH:       u32 = 0x00004000;  /* Exception Prefix High */
+    pub const SPR_SR_FO:        u32 = 0x00008000;  /* Fixed one */
+    pub const SPR_SR_SUMRA:     u32 = 0x00010000;  /* Supervisor SPR read access */
+    pub const SPR_SR_RES:       u32 = 0x0ffe0000;  /* Reserved */
+    pub const SPR_SR_CID:       u32 = 0xf0000000;  /* Context ID */
+
+}
+
+pub mod irq {
+    use super::spr::*;
+
+    pub fn get_ie() -> bool {
+        unsafe { mfspr(SPR_SR) & SPR_SR_IEE != 0 }
+    }
+
+    pub fn set_ie(ie: bool) {
+        if ie {
+            unsafe { mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_IEE) }
+        } else {
+            unsafe { mtspr(SPR_SR, mfspr(SPR_SR) & !SPR_SR_IEE) }
+        }
+    }
+
+    pub fn get_mask() -> u32 {
+        unsafe { mfspr(SPR_PICMR) }
+    }
+
+    pub fn set_mask(mask: u32) {
+        unsafe { mtspr(SPR_PICMR, mask) }
+    }
+
+    pub fn pending() -> u32 {
+        unsafe { mfspr(SPR_PICSR) }
+    }
+}
+
+extern {
+    pub fn flush_cpu_dcache();
+    pub fn flush_l2_cache();
+}
+
+pub fn ident(buf: &mut [u8]) -> &str {
+    unsafe {
+        let len = ptr::read_volatile(csr::IDENTIFIER_MEM_BASE);
+        let len = cmp::min(len as usize, buf.len());
+        for i in 0..len {
+            buf[i] = ptr::read_volatile(csr::IDENTIFIER_MEM_BASE.offset(1 + i as isize)) as u8
+        }
+        str::from_utf8_unchecked(&buf[..len])
+    }
+}

artiq/runtime.rs/src/cache.rs

@@ -0,0 +1,53 @@
+use std::vec::Vec;
+use std::string::String;
+use std::btree_map::BTreeMap;
+
+#[derive(Debug)]
+struct Entry {
+    data: Vec<u32>,
+    borrowed: bool
+}
+
+#[derive(Debug)]
+pub struct Cache {
+    entries: BTreeMap<String, Entry>
+}
+
+impl Cache {
+    pub fn new() -> Cache {
+        Cache { entries: BTreeMap::new() }
+    }
+
+    pub fn get(&mut self, key: &str) -> *const [u32] {
+        match self.entries.get_mut(key) {
+            None => &[],
+            Some(ref mut entry) => {
+                entry.borrowed = true;
+                &entry.data[..]
+            }
+        }
+    }
+
+    pub fn put(&mut self, key: &str, data: &[u32]) -> Result<(), ()> {
+        match self.entries.get_mut(key) {
+            None => (),
+            Some(ref mut entry) => {
+                if entry.borrowed { return Err(()) }
+                entry.data = Vec::from(data);
+                return Ok(())
+            }
+        }
+
+        self.entries.insert(String::from(key), Entry {
+            data: Vec::from(data),
+            borrowed: false
+        });
+        Ok(())
+    }
+
+    pub unsafe fn unborrow(&mut self) {
+        for (_key, entry) in self.entries.iter_mut() {
+            entry.borrowed = false;
+        }
+    }
+}

artiq/runtime.rs/src/clock.rs

@@ -0,0 +1,83 @@
+use board::csr;
+
+const INIT: u64 = ::core::i64::MAX as u64;
+const FREQ: u64 = ::board::csr::CONFIG_CLOCK_FREQUENCY as u64;
+
+pub fn init() {
+    unsafe {
+        csr::timer0::en_write(0);
+        csr::timer0::load_write(INIT);
+        csr::timer0::reload_write(INIT);
+        csr::timer0::en_write(1);
+    }
+}
+
+pub fn get_us() -> u64 {
+    unsafe {
+        csr::timer0::update_value_write(1);
+        (INIT - csr::timer0::value_read()) / (FREQ / 1_000_000)
+    }
+}
+
+pub fn get_ms() -> u64 {
+    unsafe {
+        csr::timer0::update_value_write(1);
+        (INIT - csr::timer0::value_read()) / (FREQ / 1_000)
+    }
+}
+
+pub fn spin_us(interval: u64) {
+    unsafe {
+        csr::timer0::update_value_write(1);
+        let threshold = csr::timer0::value_read() - interval * (FREQ / 1_000_000);
+        while csr::timer0::value_read() > threshold {
+            csr::timer0::update_value_write(1)
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+struct Watchdog {
+    active:    bool,
+    threshold: u64
+}
+
+pub const MAX_WATCHDOGS: usize = 16;
+
+#[derive(Debug)]
+pub struct WatchdogSet {
+    watchdogs: [Watchdog; MAX_WATCHDOGS]
+}
+
+impl WatchdogSet {
+    pub fn new() -> WatchdogSet {
+        WatchdogSet {
+            watchdogs: [Watchdog { active: false, threshold: 0 }; MAX_WATCHDOGS]
+        }
+    }
+
+    pub fn set_ms(&mut self, interval: u64) -> Result<usize, ()> {
+        for (index, watchdog) in self.watchdogs.iter_mut().enumerate() {
+            if !watchdog.active {
+                watchdog.active = true;
+                watchdog.threshold = get_ms() + interval;
+                return Ok(index)
+            }
+        }
+
+        Err(())
+    }
+
+    pub fn clear(&mut self, index: usize) {
+        if index < MAX_WATCHDOGS {
+            self.watchdogs[index].active = false
+        }
+    }
+
+    pub fn expired(&self) -> bool {
+        self.watchdogs.iter()
+            .filter(|wd| wd.active)
+            .min_by_key(|wd| wd.threshold)
+            .map_or(false, |wd| get_ms() > wd.threshold)
+    }
+}

artiq/runtime.rs/src/config.rs

@@ -0,0 +1,63 @@
+use std::cmp;
+use std::vec::Vec;
+use libc::{c_void, c_char, c_int, c_uint};
+
+extern {
+    fn fs_remove(key: *const c_char);
+    fn fs_erase();
+    fn fs_write(key: *const c_char, buffer: *const c_void, buflen: c_uint) -> c_int;
+    fn fs_read(key: *const c_char, buffer: *mut c_void, buflen: c_uint,
+               remain: *mut c_uint) -> c_uint;
+}
+
+macro_rules! c_str {
+    ($s:ident) => {
+        {
+            let mut c = [0; 64 + 1];
+            let len = cmp::min($s.len(), c.len() - 1);
+            c[..len].copy_from_slice($s.as_bytes());
+            c
+        }
+    }
+}
+
+pub fn read(key: &str, buf: &mut [u8]) -> Result<usize, usize> {
+    let key_c = c_str!(key);
+    let mut remain: c_uint = 0;
+    let result = unsafe {
+        fs_read(key_c.as_ptr() as *const c_char,
+                buf.as_mut_ptr() as *mut c_void, buf.len() as c_uint, &mut remain)
+    };
+    if remain == 0 { Ok(result as usize) } else { Err(remain as usize) }
+}
+
+pub fn read_to_end(key: &str) -> Vec<u8> {
+    let mut value = Vec::new();
+    match read(key, &mut []) {
+        Ok(0) => (),
+        Ok(_) => unreachable!(),
+        Err(size) => {
+            value.resize(size, 0);
+            read(key, &mut value).unwrap();
+        }
+    }
+    value
+}
+
+pub fn write(key: &str, buf: &[u8]) -> Result<(), ()> {
+    let key_c = c_str!(key);
+    let result = unsafe {
+        fs_write(key_c.as_ptr() as *const c_char,
+                 buf.as_ptr() as *mut c_void, buf.len() as c_uint)
+    };
+    if result == 1 { Ok(()) } else { Err(()) }
+}
+
+pub fn remove(key: &str) {
+    let key_c = c_str!(key);
+    unsafe { fs_remove(key_c.as_ptr() as *const c_char) }
+}
+
+pub fn erase() {
+    unsafe { fs_erase() }
+}

artiq/runtime.rs/src/kernel.rs

@@ -0,0 +1,31 @@
+use core::ptr;
+use board::csr;
+use mailbox;
+use rpc_queue;
+
+use kernel_proto::{KERNELCPU_EXEC_ADDRESS, KERNELCPU_LAST_ADDRESS, KSUPPORT_HEADER_SIZE};
+
+pub unsafe fn start() {
+    if csr::kernel_cpu::reset_read() == 0 {
+        panic!("attempted to start kernel CPU when it is already running")
+    }
+
+    stop();
+
+    let ksupport_image = include_bytes!(concat!(env!("CARGO_TARGET_DIR"), "/../ksupport.elf"));
+    let ksupport_addr = (KERNELCPU_EXEC_ADDRESS - KSUPPORT_HEADER_SIZE) as *mut u8;
+    ptr::copy_nonoverlapping(ksupport_image.as_ptr(), ksupport_addr, ksupport_image.len());
+
+    csr::kernel_cpu::reset_write(0);
+
+    rpc_queue::init();
+}
+
+pub fn stop() {
+    unsafe { csr::kernel_cpu::reset_write(1) }
+    mailbox::acknowledge();
+}
+
+pub fn validate(ptr: usize) -> bool {
+    ptr >= KERNELCPU_EXEC_ADDRESS && ptr <= KERNELCPU_LAST_ADDRESS
+}

artiq/runtime.rs/src/kernel_proto.rs

@@ -0,0 +1,62 @@
+#![allow(dead_code)]
+
+use core::marker::PhantomData;
+use core::fmt;
+
+pub const KERNELCPU_EXEC_ADDRESS:    usize = 0x40800000;
+pub const KERNELCPU_PAYLOAD_ADDRESS: usize = 0x40840000;
+pub const KERNELCPU_LAST_ADDRESS:    usize = 0x4fffffff;
+pub const KSUPPORT_HEADER_SIZE:      usize = 0x80;
+
+#[repr(C)]
+#[derive(Debug, Clone)]
+pub struct Exception<'a> {
+    pub name:     *const u8,
+    pub file:     *const u8,
+    pub line:     u32,
+    pub column:   u32,
+    pub function: *const u8,
+    pub message:  *const u8,
+    pub param:    [u64; 3],
+    pub phantom:  PhantomData<&'a str>
+}
+
+#[derive(Debug)]
+pub enum Message<'a> {
+    LoadRequest(&'a [u8]),
+    LoadReply(Result<(), &'a str>),
+
+    NowInitRequest,
+    NowInitReply(u64),
+    NowSave(u64),
+
+    RunFinished,
+    RunException {
+        exception: Exception<'a>,
+        backtrace: &'a [usize]
+    },
+    RunAborted,
+
+    WatchdogSetRequest { ms: u64 },
+    WatchdogSetReply   { id: usize },
+    WatchdogClear      { id: usize },
+
+    RpcSend {
+        async: bool,
+        service: u32,
+        tag: &'a [u8],
+        data: *const *const ()
+    },
+    RpcRecvRequest(*mut ()),
+    RpcRecvReply(Result<usize, Exception<'a>>),
+
+    CacheGetRequest { key: &'a str },
+    CacheGetReply   { value: &'static [u32] },
+    CachePutRequest { key: &'a str, value: &'static [u32] },
+    CachePutReply   { succeeded: bool },
+
+    Log(fmt::Arguments<'a>),
+    LogSlice(&'a str)
+}
+
+pub use self::Message::*;

artiq/runtime.rs/src/lib.rs

@@ -1,47 +1,144 @@
 #![no_std]
+#![feature(libc, const_fn, try_borrow, stmt_expr_attributes, repr_simd, asm,
+           lang_items)]
 
 #[macro_use]
 extern crate std_artiq as std;
+extern crate libc;
+#[macro_use]
+extern crate log;
+extern crate log_buffer;
+extern crate byteorder;
+extern crate fringe;
+extern crate lwip;
 
-use std::prelude::v1::*;
+use core::fmt::Write;
+use logger::BufferLogger;
 
-pub mod io;
+extern {
+    fn putchar(c: libc::c_int) -> libc::c_int;
+    fn readchar() -> libc::c_char;
+}
+
+#[macro_export]
+macro_rules! print {
+    ($($arg:tt)*) => ($crate::print_fmt(format_args!($($arg)*)));
+}
+
+#[macro_export]
+macro_rules! println {
+    ($fmt:expr) => (print!(concat!($fmt, "\n")));
+    ($fmt:expr, $($arg:tt)*) => (print!(concat!($fmt, "\n"), $($arg)*));
+}
+
+pub struct Console;
+
+impl core::fmt::Write for Console {
+    fn write_str(&mut self, s: &str) -> Result<(), core::fmt::Error> {
+        for c in s.bytes() { unsafe { putchar(c as i32); } }
+        Ok(())
+    }
+}
+
+pub fn print_fmt(args: self::core::fmt::Arguments) {
+    let _ = Console.write_fmt(args);
+}
+
+#[lang = "panic_fmt"]
+extern fn panic_fmt(args: self::core::fmt::Arguments, file: &'static str, line: u32) -> ! {
+    let _ = write!(Console, "panic at {}:{}: {}\n", file, line, args);
+    let _ = write!(Console, "waiting for debugger...\n");
+    unsafe {
+        let _ = readchar();
+        loop { asm!("l.trap 0") }
+    }
+}
+
+mod board;
+mod config;
+mod clock;
+mod rtio_crg;
+mod mailbox;
+mod rpc_queue;
+
+mod urc;
+mod sched;
+mod logger;
+mod cache;
+
+mod proto;
+mod kernel_proto;
+mod session_proto;
+mod moninj_proto;
+mod analyzer_proto;
+mod rpc_proto;
+
+mod kernel;
+mod session;
+#[cfg(has_rtio_moninj)]
+mod moninj;
+#[cfg(has_rtio_analyzer)]
+mod analyzer;
 
 extern {
     fn network_init();
     fn lwip_service();
 }
 
-fn timer(waiter: io::Waiter) {
-    loop {
-        println!("tick");
-        waiter.sleep(std::time::Duration::from_millis(1000)).unwrap();
-    }
-}
+include!(concat!(env!("OUT_DIR"), "/git_info.rs"));
 
-fn echo(waiter: io::Waiter) {
-    let addr = io::SocketAddr::new(io::IP_ANY, 1234);
-    let listener = io::TcpListener::bind(waiter, addr).unwrap();
-    loop {
-        let (mut stream, _addr) = listener.accept().unwrap();
-        loop {
-            let mut buf = [0];
-            stream.read(&mut buf).unwrap();
-            stream.write(&buf).unwrap();
-        }
-    }
+// Allow linking with crates that are built as -Cpanic=unwind even if we use -Cpanic=abort.
+// This is never called.
+#[allow(non_snake_case)]
+#[no_mangle]
+pub extern "C" fn _Unwind_Resume() -> ! {
+    loop {}
 }
 
 #[no_mangle]
 pub unsafe extern fn rust_main() {
-    println!("Accepting network sessions in Rust.");
+    static mut LOG_BUFFER: [u8; 65536] = [0; 65536];
+    BufferLogger::new(&mut LOG_BUFFER[..])
+                 .register(move || {
+        info!("booting ARTIQ...");
+        info!("software version {}", GIT_COMMIT);
+        info!("gateware version {}", ::board::ident(&mut [0; 64]));
+
+        clock::init();
+        rtio_crg::init();
         network_init();
 
-    let mut scheduler = io::Scheduler::new();
-    scheduler.spawn(4096, timer);
-    scheduler.spawn(4096, echo);
+        let mut scheduler = sched::Scheduler::new();
+        scheduler.spawner().spawn(16384, session::thread);
+        #[cfg(has_rtio_moninj)]
+        scheduler.spawner().spawn(4096, moninj::thread);
+        #[cfg(has_rtio_analyzer)]
+        scheduler.spawner().spawn(4096, analyzer::thread);
+
         loop {
+            scheduler.run();
             lwip_service();
-        scheduler.run()
+        }
+    })
+}
+
+#[no_mangle]
+pub unsafe extern fn isr() {
+    use board::{irq, csr};
+    extern { fn uart_isr(); }
+
+    let irqs = irq::pending() & irq::get_mask();
+    if irqs & (1 << csr::UART_INTERRUPT) != 0 {
+        uart_isr()
     }
 }
+
+#[no_mangle]
+pub fn sys_now() -> u32 {
+    clock::get_ms() as u32
+}
+
+#[no_mangle]
+pub fn sys_jiffies() -> u32 {
+    clock::get_ms() as u32
+}

artiq/runtime.rs/src/logger.rs

@@ -0,0 +1,70 @@
+use core::{mem, ptr};
+use core::cell::RefCell;
+use log::{self, Log, LogLevel, LogMetadata, LogRecord, LogLevelFilter};
+use log_buffer::LogBuffer;
+use clock;
+
+pub struct BufferLogger {
+    buffer: RefCell<LogBuffer<&'static mut [u8]>>
+}
+
+unsafe impl Sync for BufferLogger {}
+
+static mut LOGGER: *const BufferLogger = ptr::null();
+
+impl BufferLogger {
+    pub fn new(buffer: &'static mut [u8]) -> BufferLogger {
+        BufferLogger {
+            buffer: RefCell::new(LogBuffer::new(buffer))
+        }
+    }
+
+    pub fn register<F: FnOnce()>(&self, f: F) {
+        // log::set_logger_raw captures a pointer to ourselves, so we must prevent
+        // ourselves from being moved or dropped after that function is called (and
+        // before log::shutdown_logger_raw is called).
+        unsafe {
+            log::set_logger_raw(|max_log_level| {
+                max_log_level.set(LogLevelFilter::Trace);
+                self as *const Log
+            }).expect("global logger can only be initialized once");
+            LOGGER = self;
+        }
+        f();
+        log::shutdown_logger_raw().unwrap();
+        unsafe {
+            LOGGER = ptr::null();
+        }
+    }
+
+    pub fn with_instance<R, F: FnOnce(&BufferLogger) -> R>(f: F) -> R {
+        f(unsafe { mem::transmute::<*const BufferLogger, &BufferLogger>(LOGGER) })
+    }
+
+    pub fn clear(&self) {
+        self.buffer.borrow_mut().clear()
+    }
+
+    pub fn extract<R, F: FnOnce(&str) -> R>(&self, f: F) -> R {
+        f(self.buffer.borrow_mut().extract())
+    }
+}
+
+impl Log for BufferLogger {
+    fn enabled(&self, _metadata: &LogMetadata) -> bool {
+        true
+    }
+
+    fn log(&self, record: &LogRecord) {
+        if self.enabled(record.metadata()) {
+            use core::fmt::Write;
+            writeln!(self.buffer.borrow_mut(),
+                     "[{:12}us] {:>5}({}): {}",
+                     clock::get_us(), record.level(), record.target(), record.args()).unwrap();
+            if record.level() <= LogLevel::Info {
+                println!("[{:12}us] {:>5}({}): {}",
+                         clock::get_us(), record.level(), record.target(), record.args());
+            }
+        }
+    }
+}

artiq/runtime.rs/src/mailbox.rs

@@ -0,0 +1,35 @@
+use core::ptr::{read_volatile, write_volatile};
+use board;
+
+const MAILBOX: *mut usize = board::mem::MAILBOX_BASE as *mut usize;
+static mut last: usize = 0;
+
+pub unsafe fn send(data: usize) {
+    last = data;
+    write_volatile(MAILBOX, data)
+}
+
+pub fn acknowledged() -> bool {
+    unsafe {
+        let data = read_volatile(MAILBOX);
+        data == 0 || data != last
+    }
+}
+
+pub fn receive() -> usize {
+    unsafe {
+        let data = read_volatile(MAILBOX);
+        if data == last {
+            0
+        } else {
+            if data != 0 {
+                board::flush_cpu_dcache()
+            }
+            data
+        }
+    }
+}
+
+pub fn acknowledge() {
+    unsafe { write_volatile(MAILBOX, 0) }
+}

artiq/runtime.rs/src/moninj.rs

@@ -0,0 +1,124 @@
+use std::vec::Vec;
+use std::io;
+use board::csr;
+use sched::{Waiter, Spawner};
+use sched::{UdpSocket, SocketAddr, IP_ANY};
+use moninj_proto::*;
+
+const MONINJ_TTL_OVERRIDE_ENABLE: u8 = 0;
+const MONINJ_TTL_OVERRIDE_O: u8 = 1;
+const MONINJ_TTL_OVERRIDE_OE: u8 = 2;
+
+fn worker(socket: &mut UdpSocket) -> io::Result<()> {
+    let mut buf = Vec::new();
+    loop {
+        let addr = try!(socket.recv_from(&mut buf));
+        let request = try!(Request::read_from(&mut io::Cursor::new(&buf)));
+        trace!("{} -> {:?}", addr, request);
+
+        match request {
+            Request::Monitor => {
+                let mut dds_ftws = [0u32; (csr::CONFIG_RTIO_DDS_COUNT as usize *
+                                        csr::CONFIG_DDS_CHANNELS_PER_BUS as usize)];
+                let mut reply = Reply::default();
+
+                for i in 0..csr::CONFIG_RTIO_REGULAR_TTL_COUNT as u8 {
+                    unsafe {
+                        csr::rtio_moninj::mon_chan_sel_write(i);
+                        csr::rtio_moninj::mon_probe_sel_write(0);
+                        csr::rtio_moninj::mon_value_update_write(1);
+                        if csr::rtio_moninj::mon_value_read() != 0 {
+                            reply.ttl_levels |= 1 << i;
+                        }
+                        csr::rtio_moninj::mon_probe_sel_write(1);
+                        csr::rtio_moninj::mon_value_update_write(1);
+                        if csr::rtio_moninj::mon_value_read() != 0 {
+                            reply.ttl_oes |= 1 << i;
+                        }
+                        csr::rtio_moninj::inj_chan_sel_write(i);
+                        csr::rtio_moninj::inj_override_sel_write(MONINJ_TTL_OVERRIDE_ENABLE);
+                        if csr::rtio_moninj::inj_value_read() != 0 {
+                            reply.ttl_overrides |= 1 << i;
+                        }
+                    }
+                }
+
+                reply.dds_rtio_first_channel = csr::CONFIG_RTIO_FIRST_DDS_CHANNEL as u16;
+                reply.dds_channels_per_bus = csr::CONFIG_DDS_CHANNELS_PER_BUS as u16;
+
+                for j in 0..csr::CONFIG_RTIO_DDS_COUNT {
+                    unsafe {
+                        csr::rtio_moninj::mon_chan_sel_write(
+                            (csr::CONFIG_RTIO_FIRST_DDS_CHANNEL + j) as u8);
+                        for i in 0..csr::CONFIG_DDS_CHANNELS_PER_BUS {
+                            csr::rtio_moninj::mon_probe_sel_write(i as u8);
+                            csr::rtio_moninj::mon_value_update_write(1);
+                            dds_ftws[(csr::CONFIG_DDS_CHANNELS_PER_BUS * j + i) as usize] =
+                                csr::rtio_moninj::mon_value_read() as u32;
+                        }
+                    }
+                }
+                reply.dds_ftws = &dds_ftws;
+
+                trace!("{} <- {:?}", addr, reply);
+                buf.clear();
+                try!(reply.write_to(&mut buf));
+                try!(socket.send_to(&buf, addr));
+            },
+
+            Request::TtlSet { channel, mode: TtlMode::Experiment } => {
+                unsafe {
+                    csr::rtio_moninj::inj_chan_sel_write(channel);
+                    csr::rtio_moninj::inj_override_sel_write(MONINJ_TTL_OVERRIDE_ENABLE);
+                    csr::rtio_moninj::inj_value_write(0);
+                }
+            },
+
+            Request::TtlSet { channel, mode: TtlMode::High } => {
+                unsafe {
+                    csr::rtio_moninj::inj_chan_sel_write(channel);
+                    csr::rtio_moninj::inj_override_sel_write(MONINJ_TTL_OVERRIDE_O);
+                    csr::rtio_moninj::inj_value_write(1);
+                    csr::rtio_moninj::inj_override_sel_write(MONINJ_TTL_OVERRIDE_OE);
+                    csr::rtio_moninj::inj_value_write(1);
+                    csr::rtio_moninj::inj_override_sel_write(MONINJ_TTL_OVERRIDE_ENABLE);
+                    csr::rtio_moninj::inj_value_write(1);
+                }
+            },
+
+            Request::TtlSet { channel, mode: TtlMode::Low } => {
+                unsafe {
+                    csr::rtio_moninj::inj_chan_sel_write(channel);
+                    csr::rtio_moninj::inj_override_sel_write(MONINJ_TTL_OVERRIDE_O);
+                    csr::rtio_moninj::inj_value_write(0);
+                    csr::rtio_moninj::inj_override_sel_write(MONINJ_TTL_OVERRIDE_OE);
+                    csr::rtio_moninj::inj_value_write(1);
+                    csr::rtio_moninj::inj_override_sel_write(MONINJ_TTL_OVERRIDE_ENABLE);
+                    csr::rtio_moninj::inj_value_write(1);
+                }
+            },
+
+            Request::TtlSet { channel, mode: TtlMode::Input } => {
+                unsafe {
+                    csr::rtio_moninj::inj_chan_sel_write(channel);
+                    csr::rtio_moninj::inj_override_sel_write(MONINJ_TTL_OVERRIDE_OE);
+                    csr::rtio_moninj::inj_value_write(0);
+                    csr::rtio_moninj::inj_override_sel_write(MONINJ_TTL_OVERRIDE_ENABLE);
+                    csr::rtio_moninj::inj_value_write(1);
+                }
+            }
+        }
+    }
+}
+
+pub fn thread(waiter: Waiter, _spawner: Spawner) {
+    let mut socket = UdpSocket::new(waiter).expect("cannot create socket");
+    socket.bind(SocketAddr::new(IP_ANY, 3250)).expect("cannot bind socket");
+
+    loop {
+        match worker(&mut socket) {
+            Ok(())   => unreachable!(),
+            Err(err) => error!("moninj aborted: {}", err)
+        }
+    }
+}

artiq/runtime.rs/src/moninj_proto.rs

@@ -0,0 +1,65 @@
+use std::io::{self, Read, Write};
+use proto::*;
+
+#[derive(Debug)]
+pub enum TtlMode {
+    Experiment,
+    High,
+    Low,
+    Input
+}
+
+impl TtlMode {
+    pub fn read_from(reader: &mut Read) -> io::Result<TtlMode> {
+        Ok(match try!(read_u8(reader)) {
+            0 => TtlMode::Experiment,
+            1 => TtlMode::High,
+            2 => TtlMode::Low,
+            3 => TtlMode::Input,
+            _ => return Err(io::Error::new(io::ErrorKind::InvalidData, "unknown TTL mode"))
+        })
+    }
+}
+
+#[derive(Debug)]
+pub enum Request {
+    Monitor,
+    TtlSet { channel: u8, mode: TtlMode }
+}
+
+impl Request {
+    pub fn read_from(reader: &mut Read) -> io::Result<Request> {
+        Ok(match try!(read_u8(reader)) {
+            1 => Request::Monitor,
+            2 => Request::TtlSet {
+                channel: try!(read_u8(reader)),
+                mode: try!(TtlMode::read_from(reader))
+            },
+            _ => return Err(io::Error::new(io::ErrorKind::InvalidData, "unknown request type"))
+        })
+    }
+}
+
+#[derive(Debug, Default)]
+pub struct Reply<'a> {
+    pub ttl_levels: u64,
+    pub ttl_oes: u64,
+    pub ttl_overrides: u64,
+    pub dds_rtio_first_channel: u16,
+    pub dds_channels_per_bus: u16,
+    pub dds_ftws: &'a [u32]
+}
+
+impl<'a> Reply<'a> {
+    pub fn write_to(&self, writer: &mut Write) -> io::Result<()> {
+        try!(write_u64(writer, self.ttl_levels));
+        try!(write_u64(writer, self.ttl_oes));
+        try!(write_u64(writer, self.ttl_overrides));
+        try!(write_u16(writer, self.dds_rtio_first_channel));
+        try!(write_u16(writer, self.dds_channels_per_bus));
+        for dds_ftw in self.dds_ftws {
+            try!(write_u32(writer, *dds_ftw));
+        }
+        Ok(())
+    }
+}

artiq/runtime.rs/src/proto.rs

@@ -0,0 +1,76 @@
+#![allow(dead_code)]
+
+use std::io::{self, Read, Write};
+use std::vec::Vec;
+use std::string::String;
+use byteorder::{ByteOrder, NetworkEndian};
+
+// FIXME: replace these with byteorder core io traits once those are in
+pub fn read_u8(reader: &mut Read) -> io::Result<u8> {
+    let mut bytes = [0; 1];
+    try!(reader.read_exact(&mut bytes));
+    Ok(bytes[0])
+}
+
+pub fn write_u8(writer: &mut Write, value: u8) -> io::Result<()> {
+    let bytes = [value; 1];
+    writer.write_all(&bytes)
+}
+
+pub fn read_u16(reader: &mut Read) -> io::Result<u16> {
+    let mut bytes = [0; 2];
+    try!(reader.read_exact(&mut bytes));
+    Ok(NetworkEndian::read_u16(&bytes))
+}
+
+pub fn write_u16(writer: &mut Write, value: u16) -> io::Result<()> {
+    let mut bytes = [0; 2];
+    NetworkEndian::write_u16(&mut bytes, value);
+    writer.write_all(&bytes)
+}
+
+pub fn read_u32(reader: &mut Read) -> io::Result<u32> {
+    let mut bytes = [0; 4];
+    try!(reader.read_exact(&mut bytes));
+    Ok(NetworkEndian::read_u32(&bytes))
+}
+
+pub fn write_u32(writer: &mut Write, value: u32) -> io::Result<()> {
+    let mut bytes = [0; 4];
+    NetworkEndian::write_u32(&mut bytes, value);
+    writer.write_all(&bytes)
+}
+
+pub fn read_u64(reader: &mut Read) -> io::Result<u64> {
+    let mut bytes = [0; 8];
+    try!(reader.read_exact(&mut bytes));
+    Ok(NetworkEndian::read_u64(&bytes))
+}
+
+pub fn write_u64(writer: &mut Write, value: u64) -> io::Result<()> {
+    let mut bytes = [0; 8];
+    NetworkEndian::write_u64(&mut bytes, value);
+    writer.write_all(&bytes)
+}
+
+pub fn read_bytes(reader: &mut Read) -> io::Result<Vec<u8>> {
+    let length = try!(read_u32(reader));
+    let mut value = vec![0; length as usize];
+    try!(reader.read_exact(&mut value));
+    Ok(value)
+}
+
+pub fn write_bytes(writer: &mut Write, value: &[u8]) -> io::Result<()> {
+    try!(write_u32(writer, value.len() as u32));
+    writer.write_all(value)
+}
+
+pub fn read_string(reader: &mut Read) -> io::Result<String> {
+    let bytes = try!(read_bytes(reader));
+    String::from_utf8(bytes)
+           .map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "invalid UTF-8"))
+}
+
+pub fn write_string(writer: &mut Write, value: &str) -> io::Result<()> {
+    write_bytes(writer, value.as_bytes())
+}

artiq/runtime.rs/src/rpc_proto.rs

@@ -0,0 +1,369 @@
+#![allow(dead_code)]
+
+use core::slice;
+use std::io::{self, Read, Write};
+use proto::*;
+use self::tag::{Tag, TagIterator, split_tag};
+
+unsafe fn recv_value(reader: &mut Read, tag: Tag, data: &mut *mut (),
+                     alloc: &Fn(usize) -> io::Result<*mut ()>) -> io::Result<()> {
+    macro_rules! consume_value {
+        ($ty:ty, |$ptr:ident| $map:expr) => ({
+            let ptr = (*data) as *mut $ty;
+            *data = ptr.offset(1) as *mut ();
+            (|$ptr: *mut $ty| $map)(ptr)
+        })
+    }
+
+    match tag {
+        Tag::None => Ok(()),
+        Tag::Bool =>
+            consume_value!(u8, |ptr| {
+                *ptr = try!(read_u8(reader)); Ok(())
+            }),
+        Tag::Int32 =>
+            consume_value!(u32, |ptr| {
+                *ptr = try!(read_u32(reader)); Ok(())
+            }),
+        Tag::Int64 | Tag::Float64 =>
+            consume_value!(u64, |ptr| {
+                *ptr = try!(read_u64(reader)); Ok(())
+            }),
+        Tag::String => {
+            consume_value!(*mut u8, |ptr| {
+                let length = try!(read_u32(reader));
+                // NB: the received string includes a trailing \0
+                *ptr = try!(alloc(length as usize)) as *mut u8;
+                try!(reader.read_exact(slice::from_raw_parts_mut(*ptr, length as usize)));
+                Ok(())
+            })
+        }
+        Tag::Tuple(it, arity) => {
+            let mut it = it.clone();
+            for _ in 0..arity {
+                let tag = it.next().expect("truncated tag");
+                try!(recv_value(reader, tag, data, alloc))
+            }
+            Ok(())
+        }
+        Tag::List(it) | Tag::Array(it) => {
+            struct List { length: u32, elements: *mut () };
+            consume_value!(List, |ptr| {
+                (*ptr).length = try!(read_u32(reader));
+
+                let tag = it.clone().next().expect("truncated tag");
+                (*ptr).elements = try!(alloc(tag.size() * (*ptr).length as usize));
+
+                let mut data = (*ptr).elements;
+                for _ in 0..(*ptr).length as usize {
+                    try!(recv_value(reader, tag, &mut data, alloc));
+                }
+                Ok(())
+            })
+        }
+        Tag::Range(it) => {
+            let tag = it.clone().next().expect("truncated tag");
+            try!(recv_value(reader, tag, data, alloc));
+            try!(recv_value(reader, tag, data, alloc));
+            try!(recv_value(reader, tag, data, alloc));
+            Ok(())
+        }
+        Tag::Keyword(_) => unreachable!(),
+        Tag::Object => unreachable!()
+    }
+}
+
+pub fn recv_return(reader: &mut Read, tag_bytes: &[u8], data: *mut (),
+                   alloc: &Fn(usize) -> io::Result<*mut ()>) -> io::Result<()> {
+    let mut it = TagIterator::new(tag_bytes);
+    #[cfg(not(ksupport))]
+    trace!("recv ...->{}", it);
+
+    let tag = it.next().expect("truncated tag");
+    let mut data = data;
+    try!(unsafe { recv_value(reader, tag, &mut data, alloc) });
+
+    Ok(())
+}
+
+pub unsafe fn from_c_str<'a>(ptr: *const u8) -> &'a str {
+    use core::{str, slice};
+    extern { fn strlen(ptr: *const u8) -> usize; }
+    str::from_utf8_unchecked(slice::from_raw_parts(ptr as *const u8, strlen(ptr)))
+}
+
+unsafe fn send_value(writer: &mut Write, tag: Tag, data: &mut *const ()) -> io::Result<()> {
+    macro_rules! consume_value {
+        ($ty:ty, |$ptr:ident| $map:expr) => ({
+            let ptr = (*data) as *const $ty;
+            *data = ptr.offset(1) as *const ();
+            (|$ptr: *const $ty| $map)(ptr)
+        })
+    }
+
+    try!(write_u8(writer, tag.as_u8()));
+    match tag {
+        Tag::None => Ok(()),
+        Tag::Bool =>
+            consume_value!(u8, |ptr|
+                write_u8(writer, *ptr)),
+        Tag::Int32 =>
+            consume_value!(u32, |ptr|
+                write_u32(writer, *ptr)),
+        Tag::Int64 | Tag::Float64 =>
+            consume_value!(u64, |ptr|
+                write_u64(writer, *ptr)),
+        Tag::String =>
+            consume_value!(*const u8, |ptr|
+                write_string(writer, from_c_str(*ptr))),
+        Tag::Tuple(it, arity) => {
+            let mut it = it.clone();
+            try!(write_u8(writer, arity));
+            for _ in 0..arity {
+                let tag = it.next().expect("truncated tag");
+                try!(send_value(writer, tag, data))
+            }
+            Ok(())
+        }
+        Tag::List(it) | Tag::Array(it) => {
+            struct List { length: u32, elements: *const () };
+            consume_value!(List, |ptr| {
+                try!(write_u32(writer, (*ptr).length));
+                let tag = it.clone().next().expect("truncated tag");
+                let mut data = (*ptr).elements;
+                for _ in 0..(*ptr).length as usize {
+                    try!(send_value(writer, tag, &mut data));
+                }
+                Ok(())
+            })
+        }
+        Tag::Range(it) => {
+            let tag = it.clone().next().expect("truncated tag");
+            try!(send_value(writer, tag, data));
+            try!(send_value(writer, tag, data));
+            try!(send_value(writer, tag, data));
+            Ok(())
+        }
+        Tag::Keyword(it) => {
+            struct Keyword { name: *const u8, contents: () };
+            consume_value!(Keyword, |ptr| {
+                try!(write_string(writer, from_c_str((*ptr).name)));
+                let tag = it.clone().next().expect("truncated tag");
+                let mut data = &(*ptr).contents as *const ();
+                send_value(writer, tag, &mut data)
+            })
+            // Tag::Keyword never appears in composite types, so we don't have
+            // to accurately advance data.
+        }
+        Tag::Object => {
+            struct Object { id: u32 };
+            consume_value!(*const Object, |ptr|
+                write_u32(writer, (**ptr).id))
+        }
+    }
+}
+
+pub fn send_args(writer: &mut Write, service: u32, tag_bytes: &[u8],
+                 data: *const *const ()) -> io::Result<()> {
+    let (arg_tags_bytes, return_tag_bytes) = split_tag(tag_bytes);
+
+    let mut args_it = TagIterator::new(arg_tags_bytes);
+    let return_it = TagIterator::new(return_tag_bytes);
+    #[cfg(not(ksupport))]
+    trace!("send<{}>({})->{}", service, args_it, return_it);
+
+    try!(write_u32(writer, service));
+    for index in 0.. {
+        if let Some(arg_tag) = args_it.next() {
+            let mut data = unsafe { *data.offset(index) };
+            try!(unsafe { send_value(writer, arg_tag, &mut data) });
+        } else {
+            break
+        }
+    }
+    try!(write_u8(writer, 0));
+    try!(write_bytes(writer, return_tag_bytes));
+
+    Ok(())
+}
+
+mod tag {
+    use core::fmt;
+
+    pub fn split_tag(tag_bytes: &[u8]) -> (&[u8], &[u8]) {
+        let tag_separator =
+            tag_bytes.iter()
+                     .position(|&b| b == b':')
+                     .expect("tag without a return separator");
+        let (arg_tags_bytes, rest) = tag_bytes.split_at(tag_separator);
+        let return_tag_bytes = &rest[1..];
+        (arg_tags_bytes, return_tag_bytes)
+    }
+
+    #[derive(Debug, Clone, Copy)]
+    pub enum Tag<'a> {
+        None,
+        Bool,
+        Int32,
+        Int64,
+        Float64,
+        String,
+        Tuple(TagIterator<'a>, u8),
+        List(TagIterator<'a>),
+        Array(TagIterator<'a>),
+        Range(TagIterator<'a>),
+        Keyword(TagIterator<'a>),
+        Object
+    }
+
+    impl<'a> Tag<'a> {
+        pub fn as_u8(self) -> u8 {
+            match self {
+                Tag::None => b'n',
+                Tag::Bool => b'b',
+                Tag::Int32 => b'i',
+                Tag::Int64 => b'I',
+                Tag::Float64 => b'f',
+                Tag::String => b's',
+                Tag::Tuple(_, _) => b't',
+                Tag::List(_) => b'l',
+                Tag::Array(_) => b'a',
+                Tag::Range(_) => b'r',
+                Tag::Keyword(_) => b'k',
+                Tag::Object => b'O',
+            }
+        }
+
+        pub fn size(self) -> usize {
+            match self {
+                Tag::None => 0,
+                Tag::Bool => 1,
+                Tag::Int32 => 4,
+                Tag::Int64 => 8,
+                Tag::Float64 => 8,
+                Tag::String => 4,
+                Tag::Tuple(it, arity) => {
+                    let mut size = 0;
+                    for _ in 0..arity {
+                        let tag = it.clone().next().expect("truncated tag");
+                        size += tag.size();
+                    }
+                    size
+                }
+                Tag::List(_) => 8,
+                Tag::Array(_) => 8,
+                Tag::Range(it) => {
+                    let tag = it.clone().next().expect("truncated tag");
+                    tag.size() * 3
+                }
+                Tag::Keyword(_) => unreachable!(),
+                Tag::Object => unreachable!(),
+            }
+        }
+    }
+
+    #[derive(Debug, Clone, Copy)]
+    pub struct TagIterator<'a> {
+        data: &'a [u8]
+    }
+
+    impl<'a> TagIterator<'a> {
+        pub fn new(data: &'a [u8]) -> TagIterator<'a> {
+            TagIterator { data: data }
+        }
+
+        pub fn next(&mut self) -> Option<Tag<'a>> {
+            if self.data.len() == 0 {
+                return None
+            }
+
+            let tag_byte = self.data[0];
+            self.data = &self.data[1..];
+            Some(match tag_byte {
+                b'n' => Tag::None,
+                b'b' => Tag::Bool,
+                b'i' => Tag::Int32,
+                b'I' => Tag::Int64,
+                b'f' => Tag::Float64,
+                b's' => Tag::String,
+                b't' => {
+                    let count = self.data[0];
+                    self.data = &self.data[1..];
+                    Tag::Tuple(self.sub(count), count)
+                }
+                b'l' => Tag::List(self.sub(1)),
+                b'a' => Tag::Array(self.sub(1)),
+                b'r' => Tag::Range(self.sub(1)),
+                b'k' => Tag::Keyword(self.sub(1)),
+                b'O' => Tag::Object,
+                _    => unreachable!()
+            })
+        }
+
+        fn sub(&mut self, count: u8) -> TagIterator<'a> {
+            let data = self.data;
+            for _ in 0..count {
+                self.next().expect("truncated tag");
+            }
+            TagIterator { data: &data[..(data.len() - self.data.len())] }
+        }
+    }
+
+    impl<'a> fmt::Display for TagIterator<'a> {
+        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+            let mut it = self.clone();
+            let mut first = true;
+            while let Some(tag) = it.next() {
+                if first {
+                    first = false
+                } else {
+                    try!(write!(f, ", "))
+                }
+
+                match tag {
+                    Tag::None =>
+                        try!(write!(f, "None")),
+                    Tag::Bool =>
+                        try!(write!(f, "Bool")),
+                    Tag::Int32 =>
+                        try!(write!(f, "Int32")),
+                    Tag::Int64 =>
+                        try!(write!(f, "Int64")),
+                    Tag::Float64 =>
+                        try!(write!(f, "Float64")),
+                    Tag::String =>
+                        try!(write!(f, "String")),
+                    Tag::Tuple(it, _) => {
+                        try!(write!(f, "Tuple("));
+                        try!(it.fmt(f));
+                        try!(write!(f, ")"))
+                    }
+                    Tag::List(it) => {
+                        try!(write!(f, "List("));
+                        try!(it.fmt(f));
+                        try!(write!(f, ")"))
+                    }
+                    Tag::Array(it) => {
+                        try!(write!(f, "Array("));
+                        try!(it.fmt(f));
+                        try!(write!(f, ")"))
+                    }
+                    Tag::Range(it) => {
+                        try!(write!(f, "Range("));
+                        try!(it.fmt(f));
+                        try!(write!(f, ")"))
+                    }
+                    Tag::Keyword(it) => {
+                        try!(write!(f, "Keyword("));
+                        try!(it.fmt(f));
+                        try!(write!(f, ")"))
+                    }
+                    Tag::Object =>
+                        try!(write!(f, "Object"))
+                }
+            }
+
+            Ok(())
+        }
+    }
+}

artiq/runtime.rs/src/rpc_queue.rs

@@ -0,0 +1,61 @@
+#![allow(dead_code)]
+
+use core::ptr::{read_volatile, write_volatile};
+use core::slice;
+use board;
+
+const SEND_MAILBOX: *mut usize = (board::mem::MAILBOX_BASE + 4) as *mut usize;
+const RECV_MAILBOX: *mut usize = (board::mem::MAILBOX_BASE + 8) as *mut usize;
+
+const QUEUE_BEGIN: usize = 0x40400000;
+const QUEUE_END:   usize = 0x407fff80;
+const QUEUE_CHUNK: usize = 0x1000;
+
+pub unsafe fn init() {
+    write_volatile(SEND_MAILBOX, QUEUE_BEGIN);
+    write_volatile(RECV_MAILBOX, QUEUE_BEGIN);
+}
+
+fn next(mut addr: usize) -> usize {
+    debug_assert!(addr % QUEUE_CHUNK == 0);
+    debug_assert!(addr >= QUEUE_BEGIN && addr < QUEUE_END);
+
+    addr += QUEUE_CHUNK;
+    if addr >= QUEUE_END { addr = QUEUE_BEGIN }
+    addr
+}
+
+pub fn empty() -> bool {
+    unsafe { read_volatile(SEND_MAILBOX) == read_volatile(RECV_MAILBOX) }
+}
+
+pub fn full() -> bool {
+    unsafe { next(read_volatile(SEND_MAILBOX)) == read_volatile(RECV_MAILBOX) }
+}
+
+pub fn enqueue<T, E, F>(f: F) -> Result<T, E>
+        where F: FnOnce(&mut [u8]) -> Result<T, E> {
+    debug_assert!(!full());
+
+    unsafe {
+        let slice = slice::from_raw_parts_mut(read_volatile(SEND_MAILBOX) as *mut u8, QUEUE_CHUNK);
+        f(slice).and_then(|x| {
+            write_volatile(SEND_MAILBOX, next(read_volatile(SEND_MAILBOX)));
+            Ok(x)
+        })
+    }
+}
+
+pub fn dequeue<T, E, F>(f: F) -> Result<T, E>
+        where F: FnOnce(&mut [u8]) -> Result<T, E> {
+    debug_assert!(!empty());
+
+    unsafe {
+        board::flush_cpu_dcache();
+        let slice = slice::from_raw_parts_mut(read_volatile(RECV_MAILBOX) as *mut u8, QUEUE_CHUNK);
+        f(slice).and_then(|x| {
+            write_volatile(RECV_MAILBOX, next(read_volatile(RECV_MAILBOX)));
+            Ok(x)
+        })
+    }
+}

artiq/runtime.rs/src/rtio_crg.rs

@@ -0,0 +1,65 @@
+use config;
+
+#[cfg(has_rtio_crg)]
+mod imp {
+    use board::csr;
+    use clock;
+
+    pub fn init() {
+        unsafe { csr::rtio_crg::pll_reset_write(0) }
+    }
+
+    pub fn check() -> bool {
+        unsafe { csr::rtio_crg::pll_locked_read() != 0 }
+    }
+
+    pub fn switch_clock(clk: u8) -> bool {
+        unsafe {
+            let cur_clk = csr::rtio_crg::clock_sel_read();
+            if clk != cur_clk {
+                csr::rtio_crg::pll_reset_write(1);
+                csr::rtio_crg::clock_sel_write(clk);
+                csr::rtio_crg::pll_reset_write(0);
+            }
+        }
+
+        clock::spin_us(150);
+        return check()
+    }
+}
+
+#[cfg(not(has_rtio_crg))]
+mod imp {
+    pub fn init() {}
+    pub fn check() -> bool { true }
+    pub fn switch_clock(clk: u8) -> bool { true }
+}
+
+pub fn init() {
+    imp::init();
+
+    let mut opt = [b'i'];
+    let clk;
+    match config::read("startup_clock", &mut opt) {
+        Ok(0) | Ok(1) if &opt == b"i" => {
+            info!("startup RTIO clock: internal");
+            clk = 0
+        }
+        Ok(1) if &opt == b"e" => {
+            info!("startup RTIO clock: external");
+            clk = 1
+        }
+        _ => {
+            error!("unrecognized startup_clock configuration entry");
+            clk = 0
+        }
+    };
+
+    if !switch_clock(clk) {
+        error!("startup RTIO clock failed");
+        warn!("this may cause the system initialization to fail");
+        warn!("fix clocking and reset the device");
+    }
+}
+
+pub use self::imp::{check, switch_clock};

artiq/runtime.rs/src/sched.rs

@@ -1,16 +1,17 @@
-extern crate fringe;
-extern crate lwip;
+#![allow(dead_code)]
 
 use std::cell::RefCell;
 use std::vec::Vec;
-use std::time::{Instant, Duration};
 use std::io::{Read, Write, Result, Error, ErrorKind};
-use self::fringe::OwnedStack;
-use self::fringe::generator::{Generator, Yielder};
+use fringe::OwnedStack;
+use fringe::generator::{Generator, Yielder, State as GeneratorState};
+use lwip;
+use clock;
+use urc::Urc;
 
 #[derive(Debug)]
 struct WaitRequest {
-    timeout: Option<Instant>,
+    timeout: Option<u64>,
     event:   Option<WaitEvent>
 }
 
@@ -28,43 +29,91 @@ struct Thread {
     interrupted: bool
 }
 
-#[derive(Debug)]
-pub struct Scheduler {
-    threads: Vec<Thread>,
-    index:   usize
-}
-
-impl Scheduler {
-    pub fn new() -> Scheduler {
-        Scheduler { threads: Vec::new(), index: 0 }
-    }
-
-    pub unsafe fn spawn<F: FnOnce(Waiter) + Send + 'static>(&mut self, stack_size: usize, f: F) {
+impl Thread {
+    unsafe fn new<F>(spawner: Spawner, stack_size: usize, f: F) -> ThreadHandle
+            where F: 'static + FnOnce(Waiter, Spawner) + Send {
         let stack = OwnedStack::new(stack_size);
-        let thread = Thread {
-            generator:   Generator::unsafe_new(stack, move |yielder, _| {
-                f(Waiter(yielder))
+        ThreadHandle::new(Thread {
+            generator: Generator::unsafe_new(stack, |yielder, _| {
+                f(Waiter(yielder), spawner)
             }),
             waiting_for: WaitRequest {
                 timeout: None,
                 event:   None
             },
             interrupted: false
-        };
-        self.threads.push(thread)
+        })
+    }
+
+    pub fn terminated(&self) -> bool {
+        // FIXME: https://github.com/nathan7/libfringe/pull/56
+        match self.generator.state() {
+            GeneratorState::Unavailable => true,
+            GeneratorState::Runnable => false
+        }
+    }
+
+    pub fn interrupt(&mut self) {
+        self.interrupted = true
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct ThreadHandle(Urc<RefCell<Thread>>);
+
+impl ThreadHandle {
+    fn new(thread: Thread) -> ThreadHandle {
+        ThreadHandle(Urc::new(RefCell::new(thread)))
+    }
+
+    pub fn terminated(&self) -> bool {
+        match self.0.try_borrow() {
+            Ok(thread) => thread.terminated(),
+            Err(_) => false // the running thread hasn't terminated
+        }
+    }
+
+    pub fn interrupt(&self) {
+        match self.0.try_borrow_mut() {
+            Ok(mut thread) => thread.interrupt(),
+            Err(_) => panic!("cannot interrupt the running thread")
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct Scheduler {
+    threads: Vec<ThreadHandle>,
+    index: usize,
+    spawner: Spawner
+}
+
+impl Scheduler {
+    pub fn new() -> Scheduler {
+        Scheduler {
+            threads: Vec::new(),
+            index: 0,
+            spawner: Spawner::new()
+        }
+    }
+
+    pub fn spawner(&self) -> &Spawner {
+        &self.spawner
     }
 
     pub fn run(&mut self) {
+        self.threads.append(&mut *self.spawner.queue.borrow_mut());
+
         if self.threads.len() == 0 { return }
 
-        let now = Instant::now();
+        let now = clock::get_ms();
 
         let start_index = self.index;
         loop {
             self.index = (self.index + 1) % self.threads.len();
 
             let result = {
-                let thread = &mut self.threads[self.index];
+                let thread = &mut *self.threads[self.index].0.borrow_mut();
                 match thread.waiting_for {
                     _ if thread.interrupted => {
                         thread.interrupted = false;
@@ -95,7 +144,8 @@ impl Scheduler {
                 },
                 Some(wait_request) => {
                     // The thread has suspended itself.
-                    self.threads[self.index].waiting_for = wait_request
+                    let thread = &mut *self.threads[self.index].0.borrow_mut();
+                    thread.waiting_for = wait_request
                 }
             }
 
@@ -104,8 +154,27 @@ impl Scheduler {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
+pub struct Spawner {
+    queue: Urc<RefCell<Vec<ThreadHandle>>>
+}
+
+impl Spawner {
+    fn new() -> Spawner {
+        Spawner { queue: Urc::new(RefCell::new(Vec::new())) }
+    }
+
+    pub fn spawn<F>(&self, stack_size: usize, f: F) -> ThreadHandle
+            where F: 'static + FnOnce(Waiter, Spawner) + Send {
+        let handle = unsafe { Thread::new(self.clone(), stack_size, f) };
+        self.queue.borrow_mut().push(handle.clone());
+        handle
+    }
+}
+
 enum WaitEvent {
+    Completion(*const (Fn() -> bool + 'static)),
+    Termination(*const RefCell<Thread>),
     UdpReadable(*const RefCell<lwip::UdpSocketState>),
     TcpAcceptable(*const RefCell<lwip::TcpListenerState>),
     TcpWriteable(*const RefCell<lwip::TcpStreamState>),
@@ -115,6 +184,10 @@ enum WaitEvent {
 impl WaitEvent {
     fn completed(&self) -> bool {
         match *self {
+            WaitEvent::Completion(f) =>
+                unsafe { (*f)() },
+            WaitEvent::Termination(thread) =>
+                unsafe { (*thread).borrow().terminated() },
             WaitEvent::UdpReadable(state) =>
                 unsafe { (*state).borrow().readable() },
             WaitEvent::TcpAcceptable(state) =>
@@ -127,15 +200,23 @@ impl WaitEvent {
     }
 }
 
+// *const DST doesn't have impl Debug
+impl ::core::fmt::Debug for WaitEvent {
+    fn fmt(&self, f: &mut ::core::fmt::Formatter) ->
+            ::core::result::Result<(), ::core::fmt::Error> {
+        write!(f, "WaitEvent...")
+    }
+}
+
 unsafe impl Send for WaitEvent {}
 
 #[derive(Debug, Clone, Copy)]
 pub struct Waiter<'a>(&'a Yielder<WaitResult, WaitRequest, OwnedStack>);
 
 impl<'a> Waiter<'a> {
-    pub fn sleep(&self, duration: Duration) -> Result<()> {
+    pub fn sleep(&self, duration_ms: u64) -> Result<()> {
         let request = WaitRequest {
-            timeout: Some(Instant::now() + duration),
+            timeout: Some(clock::get_ms() + duration_ms),
             event:   None
         };
 
@@ -154,6 +235,27 @@ impl<'a> Waiter<'a> {
         }
     }
 
+    pub fn relinquish(&self) -> Result<()> {
+        self.suspend(WaitRequest {
+            timeout: None,
+            event:   None
+        })
+    }
+
+    pub fn join(&self, thread: ThreadHandle) -> Result<()> {
+        self.suspend(WaitRequest {
+            timeout: None,
+            event:   Some(WaitEvent::Termination(&*thread.0))
+        })
+    }
+
+    pub fn until<F: Fn() -> bool + 'static>(&self, f: F) -> Result<()> {
+        self.suspend(WaitRequest {
+            timeout: None,
+            event:   Some(WaitEvent::Completion(&f as *const _))
+        })
+    }
+
     pub fn udp_readable(&self, socket: &lwip::UdpSocket) -> Result<()> {
         self.suspend(WaitRequest {
             timeout: None,
@@ -185,7 +287,7 @@ impl<'a> Waiter<'a> {
 
 // Wrappers around lwip
 
-pub use self::lwip::{IpAddr, IP4_ANY, IP6_ANY, IP_ANY, SocketAddr};
+pub use lwip::{IpAddr, IP4_ANY, IP6_ANY, IP_ANY, SocketAddr};
 
 #[derive(Debug)]
 pub struct UdpSocket<'a> {
@@ -201,6 +303,14 @@ impl<'a> UdpSocket<'a> {
         })
     }
 
+    pub fn into_lower(self) -> lwip::UdpSocket {
+        self.lower
+    }
+
+    pub fn from_lower(waiter: Waiter<'a>, inner: lwip::UdpSocket) -> UdpSocket {
+        UdpSocket { waiter: waiter, lower: inner }
+    }
+
     pub fn bind(&self, addr: SocketAddr) -> Result<()> {
         Ok(try!(self.lower.bind(addr)))
     }
@@ -218,12 +328,12 @@ impl<'a> UdpSocket<'a> {
         Ok(buf.len())
     }
 
-    pub fn recv_from(&self, buf: &mut [u8]) -> Result<(usize, SocketAddr)> {
+    pub fn recv_from(&self, buf: &mut Vec<u8>) -> Result<SocketAddr> {
         try!(self.waiter.udp_readable(&self.lower));
         let (pbuf, addr) = self.lower.try_recv().unwrap();
-        let len = ::std::cmp::min(buf.len(), pbuf.len());
-        (&mut buf[..len]).copy_from_slice(&pbuf.as_slice()[..len]);
-        Ok((len, addr))
+        buf.clear();
+        buf.extend_from_slice(&pbuf.as_slice());
+        Ok(addr)
     }
 
     pub fn send(&self, buf: &[u8]) -> Result<usize> {
@@ -239,6 +349,10 @@ impl<'a> UdpSocket<'a> {
         (&mut buf[..len]).copy_from_slice(&pbuf.as_slice()[..len]);
         Ok(len)
     }
+
+    pub fn readable(&self) -> bool {
+        self.lower.state().borrow().readable()
+    }
 }
 
 #[derive(Debug)]
@@ -255,6 +369,14 @@ impl<'a> TcpListener<'a> {
         })
     }
 
+    pub fn into_lower(self) -> lwip::TcpListener {
+        self.lower
+    }
+
+    pub fn from_lower(waiter: Waiter<'a>, inner: lwip::TcpListener) -> TcpListener {
+        TcpListener { waiter: waiter, lower: inner }
+    }
+
     pub fn accept(&self) -> Result<(TcpStream, SocketAddr)> {
         try!(self.waiter.tcp_acceptable(&self.lower));
         let stream_lower = self.lower.try_accept().unwrap();
@@ -265,9 +387,23 @@ impl<'a> TcpListener<'a> {
             buffer: None
         }, addr))
     }
+
+    pub fn acceptable(&self) -> bool {
+        self.lower.state().borrow().acceptable()
     }
 
-pub use self::lwip::Shutdown;
+    pub fn keepalive(&self) -> bool {
+        self.lower.keepalive()
+    }
+
+    pub fn set_keepalive(&self, keepalive: bool) {
+        self.lower.set_keepalive(keepalive)
+    }
+}
+
+pub use lwip::Shutdown;
+
+pub struct TcpStreamInner(lwip::TcpStream, Option<(lwip::Pbuf<'static>, usize)>);
 
 #[derive(Debug)]
 pub struct TcpStream<'a> {
@@ -277,23 +413,43 @@ pub struct TcpStream<'a> {
 }
 
 impl<'a> TcpStream<'a> {
+    pub fn into_lower(self) -> TcpStreamInner {
+        TcpStreamInner(self.lower, self.buffer)
+    }
+
+    pub fn from_lower(waiter: Waiter<'a>, inner: TcpStreamInner) -> TcpStream {
+        TcpStream { waiter: waiter, lower: inner.0, buffer: inner.1 }
+    }
+
     pub fn shutdown(&self, how: Shutdown) -> Result<()> {
         Ok(try!(self.lower.shutdown(how)))
     }
+
+    pub fn readable(&self) -> bool {
+        self.buffer.is_some() || self.lower.state().borrow().readable()
+    }
+
+    pub fn writeable(&self) -> bool {
+        self.lower.state().borrow().writeable()
+    }
 }
 
 impl<'a> Read for TcpStream<'a> {
     fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
         if self.buffer.is_none() {
             try!(self.waiter.tcp_readable(&self.lower));
-            let pbuf = try!(self.lower.try_read()).unwrap();
-            self.buffer = Some((pbuf, 0))
+            match self.lower.try_read() {
+                Ok(Some(pbuf)) => self.buffer = Some((pbuf, 0)),
+                Ok(None) => unreachable!(),
+                Err(lwip::Error::ConnectionClosed) => return Ok(0),
+                Err(err) => return Err(Error::from(err))
+            }
         }
 
         let (pbuf, pos) = self.buffer.take().unwrap();
         let slice = &pbuf.as_slice()[pos..];
         let len = ::std::cmp::min(buf.len(), slice.len());
-        buf.copy_from_slice(&slice[..len]);
+        buf[..len].copy_from_slice(&slice[..len]);
         if len < slice.len() {
             self.buffer = Some((pbuf, pos + len))
         }
@@ -304,7 +460,9 @@ impl<'a> Read for TcpStream<'a> {
 impl<'a> Write for TcpStream<'a> {
     fn write(&mut self, buf: &[u8]) -> Result<usize> {
         try!(self.waiter.tcp_writeable(&self.lower));
-        Ok(try!(self.lower.write(buf)))
+        Ok(try!(self.lower.write_in_place(buf,
+                    || self.waiter.relinquish()
+                                  .map_err(|_| lwip::Error::Interrupted))))
     }
 
     fn flush(&mut self) -> Result<()> {

artiq/runtime.rs/src/session.rs

@@ -0,0 +1,641 @@
+use std::prelude::v1::*;
+use std::{mem, str};
+use std::cell::RefCell;
+use std::io::{self, Read, Write, BufWriter};
+use {config, rtio_crg, clock, mailbox, rpc_queue, kernel};
+use logger::BufferLogger;
+use cache::Cache;
+use urc::Urc;
+use sched::{ThreadHandle, Waiter, Spawner};
+use sched::{TcpListener, TcpStream, SocketAddr, IP_ANY};
+use byteorder::{ByteOrder, NetworkEndian};
+
+use rpc_proto as rpc;
+use session_proto as host;
+use kernel_proto as kern;
+
+macro_rules! unexpected {
+    ($($arg:tt)*) => {
+        {
+            error!($($arg)*);
+            return Err(io::Error::new(io::ErrorKind::InvalidData, "protocol error"))
+        }
+    };
+}
+
+fn io_error(msg: &str) -> io::Error {
+    io::Error::new(io::ErrorKind::Other, msg)
+}
+
+// Persistent state
+#[derive(Debug)]
+struct Congress {
+    now: u64,
+    cache: Cache
+}
+
+impl Congress {
+    fn new() -> Congress {
+        Congress {
+            now: 0,
+            cache: Cache::new()
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum KernelState {
+    Absent,
+    Loaded,
+    Running,
+    RpcWait
+}
+
+// Per-connection state
+#[derive(Debug)]
+struct Session<'a> {
+    congress: &'a mut Congress,
+    kernel_state: KernelState,
+    watchdog_set: clock::WatchdogSet,
+    log_buffer: String
+}
+
+impl<'a> Session<'a> {
+    fn new(congress: &mut Congress) -> Session {
+        Session {
+            congress: congress,
+            kernel_state: KernelState::Absent,
+            watchdog_set: clock::WatchdogSet::new(),
+            log_buffer: String::new()
+        }
+    }
+
+    fn running(&self) -> bool {
+        match self.kernel_state {
+            KernelState::Absent  | KernelState::Loaded  => false,
+            KernelState::Running | KernelState::RpcWait => true
+        }
+    }
+
+    fn flush_log_buffer(&mut self) {
+        if &self.log_buffer[self.log_buffer.len() - 1..] == "\n" {
+            for line in self.log_buffer.lines() {
+                info!(target: "kernel", "{}", line);
+            }
+            self.log_buffer.clear()
+        }
+    }
+}
+
+impl<'a> Drop for Session<'a> {
+    fn drop(&mut self) {
+        kernel::stop()
+    }
+}
+
+fn check_magic(stream: &mut TcpStream) -> io::Result<()> {
+    const MAGIC: &'static [u8] = b"ARTIQ coredev\n";
+
+    let mut magic: [u8; 14] = [0; 14];
+    try!(stream.read_exact(&mut magic));
+    if magic != MAGIC {
+        Err(io::Error::new(io::ErrorKind::InvalidData, "unrecognized magic"))
+    } else {
+        Ok(())
+    }
+}
+
+fn host_read(stream: &mut TcpStream) -> io::Result<host::Request> {
+    let request = try!(host::Request::read_from(stream));
+    match &request {
+        &host::Request::LoadKernel(_) => trace!("comm<-host LoadLibrary(...)"),
+        _ => trace!("comm<-host {:?}", request)
+    }
+    Ok(request)
+}
+
+fn host_write(stream: &mut Write, reply: host::Reply) -> io::Result<()> {
+    trace!("comm->host {:?}", reply);
+    reply.write_to(stream)
+}
+
+fn kern_send(waiter: Waiter, request: &kern::Message) -> io::Result<()> {
+    match request {
+        &kern::LoadRequest(_) => trace!("comm->kern LoadRequest(...)"),
+        _ => trace!("comm->kern {:?}", request)
+    }
+    unsafe { mailbox::send(request as *const _ as usize) }
+    waiter.until(mailbox::acknowledged)
+}
+
+fn kern_recv_notrace<R, F>(waiter: Waiter, f: F) -> io::Result<R>
+        where F: FnOnce(&kern::Message) -> io::Result<R> {
+    try!(waiter.until(|| mailbox::receive() != 0));
+    if !kernel::validate(mailbox::receive()) {
+        let message = format!("invalid kernel CPU pointer 0x{:x}", mailbox::receive());
+        return Err(io::Error::new(io::ErrorKind::InvalidData, message))
+    }
+
+    f(unsafe { mem::transmute::<usize, &kern::Message>(mailbox::receive()) })
+}
+
+fn kern_recv_dotrace(reply: &kern::Message) {
+    match reply {
+        &kern::Log(_) => trace!("comm<-kern Log(...)"),
+        &kern::LogSlice(_) => trace!("comm<-kern LogSlice(...)"),
+        _ => trace!("comm<-kern {:?}", reply)
+    }
+}
+
+#[inline(always)]
+fn kern_recv<R, F>(waiter: Waiter, f: F) -> io::Result<R>
+        where F: FnOnce(&kern::Message) -> io::Result<R> {
+    kern_recv_notrace(waiter, |reply| {
+        kern_recv_dotrace(reply);
+        f(reply)
+    })
+}
+
+fn kern_acknowledge() -> io::Result<()> {
+    mailbox::acknowledge();
+    Ok(())
+}
+
+unsafe fn kern_load(waiter: Waiter, session: &mut Session, library: &[u8]) -> io::Result<()> {
+    if session.running() {
+        unexpected!("attempted to load a new kernel while a kernel was running")
+    }
+
+    kernel::start();
+
+    try!(kern_send(waiter, &kern::LoadRequest(&library)));
+    kern_recv(waiter, |reply| {
+        match reply {
+            &kern::LoadReply(Ok(())) => {
+                session.kernel_state = KernelState::Loaded;
+                Ok(())
+            }
+            &kern::LoadReply(Err(error)) =>
+                unexpected!("cannot load kernel: {}", error),
+            other =>
+                unexpected!("unexpected reply from kernel CPU: {:?}", other)
+        }
+    })
+}
+
+fn kern_run(session: &mut Session) -> io::Result<()> {
+    if session.kernel_state != KernelState::Loaded {
+        unexpected!("attempted to run a kernel while not in Loaded state")
+    }
+
+    session.kernel_state = KernelState::Running;
+    // TODO: make this a separate request
+    kern_acknowledge()
+}
+
+fn process_host_message(waiter: Waiter,
+                        stream: &mut TcpStream,
+                        session: &mut Session) -> io::Result<()> {
+    match try!(host_read(stream)) {
+        host::Request::Ident =>
+            host_write(stream, host::Reply::Ident(::board::ident(&mut [0; 64]))),
+
+        // artiq_corelog
+        host::Request::Log => {
+            // Logging the packet with the log is inadvisable
+            trace!("comm->host Log(...)");
+            BufferLogger::with_instance(|logger| {
+                logger.extract(|log| {
+                    host::Reply::Log(log).write_to(stream)
+                })
+            })
+        }
+
+        host::Request::LogClear => {
+            BufferLogger::with_instance(|logger| logger.clear());
+            host_write(stream, host::Reply::Log(""))
+        }
+
+        // artiq_coreconfig
+        host::Request::FlashRead { ref key } => {
+            let value = config::read_to_end(key);
+            host_write(stream, host::Reply::FlashRead(&value))
+        }
+
+        host::Request::FlashWrite { ref key, ref value } => {
+            match config::write(key, value) {
+                Ok(_)  => host_write(stream, host::Reply::FlashOk),
+                Err(_) => host_write(stream, host::Reply::FlashError)
+            }
+        }
+
+        host::Request::FlashRemove { ref key } => {
+            config::remove(key);
+            host_write(stream, host::Reply::FlashOk)
+        }
+
+        host::Request::FlashErase => {
+            config::erase();
+            host_write(stream, host::Reply::FlashOk)
+        }
+
+        // artiq_run/artiq_master
+        host::Request::SwitchClock(clk) => {
+            if session.running() {
+                unexpected!("attempted to switch RTIO clock while a kernel was running")
+            }
+
+            if rtio_crg::switch_clock(clk) {
+                host_write(stream, host::Reply::ClockSwitchCompleted)
+            } else {
+                host_write(stream, host::Reply::ClockSwitchFailed)
+            }
+        }
+
+        host::Request::LoadKernel(kernel) =>
+            match unsafe { kern_load(waiter, session, &kernel) } {
+                Ok(()) => host_write(stream, host::Reply::LoadCompleted),
+                Err(_) => {
+                    try!(kern_acknowledge());
+                    host_write(stream, host::Reply::LoadFailed)
+                }
+            },
+
+        host::Request::RunKernel =>
+            match kern_run(session) {
+                Ok(()) => Ok(()),
+                Err(_) => host_write(stream, host::Reply::KernelStartupFailed)
+            },
+
+        host::Request::RpcReply { tag } => {
+            if session.kernel_state != KernelState::RpcWait {
+                unexpected!("unsolicited RPC reply")
+            }
+
+            let slot = try!(kern_recv(waiter, |reply| {
+                match reply {
+                    &kern::RpcRecvRequest(slot) => Ok(slot),
+                    other => unexpected!("unexpected reply from kernel CPU: {:?}", other)
+                }
+            }));
+            try!(rpc::recv_return(stream, &tag, slot, &|size| {
+                try!(kern_send(waiter, &kern::RpcRecvReply(Ok(size))));
+                kern_recv(waiter, |reply| {
+                    match reply {
+                        &kern::RpcRecvRequest(slot) => Ok(slot),
+                        other => unexpected!("unexpected reply from kernel CPU: {:?}", other)
+                    }
+                })
+            }));
+            try!(kern_send(waiter, &kern::RpcRecvReply(Ok(0))));
+
+            session.kernel_state = KernelState::Running;
+            Ok(())
+        }
+
+        host::Request::RpcException {
+            name, message, param, file, line, column, function
+        } => {
+            if session.kernel_state != KernelState::RpcWait {
+                unexpected!("unsolicited RPC reply")
+            }
+
+            try!(kern_recv(waiter, |reply| {
+                match reply {
+                    &kern::RpcRecvRequest(_) => Ok(()),
+                    other =>
+                        unexpected!("unexpected reply from kernel CPU: {:?}", other)
+                }
+            }));
+
+            // FIXME: gross.
+            fn into_c_str(s: String) -> *const u8 {
+                let s = s + "\0";
+                let p = s.as_bytes().as_ptr();
+                mem::forget(s);
+                p
+            }
+            let exn = kern::Exception {
+                name: into_c_str(name),
+                message: into_c_str(message),
+                param: param,
+                file: into_c_str(file),
+                line: line,
+                column: column,
+                function: into_c_str(function),
+                phantom: ::core::marker::PhantomData
+            };
+            try!(kern_send(waiter, &kern::RpcRecvReply(Err(exn))));
+
+            session.kernel_state = KernelState::Running;
+            Ok(())
+        }
+    }
+}
+
+fn process_kern_message(waiter: Waiter,
+                        mut stream: Option<&mut TcpStream>,
+                        session: &mut Session) -> io::Result<bool> {
+    kern_recv_notrace(waiter, |request| {
+        match (request, session.kernel_state) {
+            (&kern::LoadReply(_), KernelState::Loaded) |
+            (&kern::RpcRecvRequest(_), KernelState::RpcWait) => {
+                // We're standing by; ignore the message.
+                return Ok(false)
+            }
+            (_, KernelState::Running) => (),
+            _ => {
+                unexpected!("unexpected request {:?} from kernel CPU in {:?} state",
+                            request, session.kernel_state)
+            }
+        }
+
+        kern_recv_dotrace(request);
+        match request {
+            &kern::Log(args) => {
+                use std::fmt::Write;
+                try!(session.log_buffer.write_fmt(args)
+                        .map_err(|_| io_error("cannot append to session log buffer")));
+                session.flush_log_buffer();
+                kern_acknowledge()
+            }
+
+            &kern::LogSlice(arg) => {
+                session.log_buffer += arg;
+                session.flush_log_buffer();
+                kern_acknowledge()
+            }
+
+            &kern::NowInitRequest =>
+                kern_send(waiter, &kern::NowInitReply(session.congress.now)),
+
+            &kern::NowSave(now) => {
+                session.congress.now = now;
+                kern_acknowledge()
+            }
+
+            &kern::WatchdogSetRequest { ms } => {
+                let id = try!(session.watchdog_set.set_ms(ms)
+                                .map_err(|()| io_error("out of watchdogs")));
+                kern_send(waiter, &kern::WatchdogSetReply { id: id })
+            }
+
+            &kern::WatchdogClear { id } => {
+                session.watchdog_set.clear(id);
+                kern_acknowledge()
+            }
+
+            &kern::RpcSend { async, service, tag, data } => {
+                match stream {
+                    None => unexpected!("unexpected RPC in flash kernel"),
+                    Some(ref mut stream) => {
+                        let writer = &mut BufWriter::new(stream);
+                        try!(host_write(writer, host::Reply::RpcRequest { async: async }));
+                        try!(rpc::send_args(writer, service, tag, data));
+                        if !async {
+                            session.kernel_state = KernelState::RpcWait
+                        }
+                        kern_acknowledge()
+                    }
+                }
+            }
+
+            &kern::CacheGetRequest { key } => {
+                let value = session.congress.cache.get(key);
+                kern_send(waiter, &kern::CacheGetReply {
+                    value: unsafe { mem::transmute::<*const [u32], &'static [u32]>(value) }
+                })
+            }
+
+            &kern::CachePutRequest { key, value } => {
+                let succeeded = session.congress.cache.put(key, value).is_ok();
+                kern_send(waiter, &kern::CachePutReply { succeeded: succeeded })
+            }
+
+            &kern::RunFinished => {
+                kernel::stop();
+                session.kernel_state = KernelState::Absent;
+                unsafe { session.congress.cache.unborrow() }
+
+                match stream {
+                    None => return Ok(true),
+                    Some(ref mut stream) =>
+                        host_write(stream, host::Reply::KernelFinished)
+                }
+            }
+
+            &kern::RunException { exception: ref exn, backtrace } => {
+                kernel::stop();
+                session.kernel_state = KernelState::Absent;
+                unsafe { session.congress.cache.unborrow() }
+
+                unsafe fn from_c_str<'a>(s: *const u8) -> &'a str {
+                    use ::libc::{c_char, size_t};
+                    use core::slice;
+                    extern { fn strlen(s: *const c_char) -> size_t; }
+                    let s = slice::from_raw_parts(s, strlen(s as *const c_char));
+                    str::from_utf8_unchecked(s)
+                }
+                let name = unsafe { from_c_str(exn.name) };
+                let message = unsafe { from_c_str(exn.message) };
+                let file = unsafe { from_c_str(exn.file) };
+                let function = unsafe { from_c_str(exn.function) };
+                match stream {
+                    None => {
+                        error!("exception in flash kernel");
+                        error!("{}: {} {:?}", name, message, exn.param);
+                        error!("at {}:{}:{} in {}", file, exn.line, exn.column, function);
+                        return Ok(true)
+                    },
+                    Some(ref mut stream) =>
+                        host_write(stream, host::Reply::KernelException {
+                            name: name,
+                            message: message,
+                            param: exn.param,
+                            file: file,
+                            line: exn.line,
+                            column: exn.column,
+                            function: function,
+                            backtrace: backtrace
+                        })
+                }
+            }
+
+            request => unexpected!("unexpected request {:?} from kernel CPU", request)
+        }.and(Ok(false))
+    })
+}
+
+fn process_kern_queued_rpc(stream: &mut TcpStream,
+                           session: &mut Session) -> io::Result<()> {
+    rpc_queue::dequeue(|slice| {
+        trace!("comm<-kern (async RPC)");
+        let length = NetworkEndian::read_u32(slice) as usize;
+        try!(host_write(stream, host::Reply::RpcRequest { async: true }));
+        trace!("{:?}" ,&slice[4..][..length]);
+        try!(stream.write(&slice[4..][..length]));
+        Ok(())
+    })
+}
+
+fn host_kernel_worker(waiter: Waiter,
+                      stream: &mut TcpStream,
+                      congress: &mut Congress) -> io::Result<()> {
+    let mut session = Session::new(congress);
+
+    loop {
+        while !rpc_queue::empty() {
+            try!(process_kern_queued_rpc(stream, &mut session))
+        }
+
+        if stream.readable() {
+            try!(process_host_message(waiter, stream, &mut session));
+        }
+
+        if mailbox::receive() != 0 {
+            try!(process_kern_message(waiter, Some(stream), &mut session));
+        }
+
+        if session.kernel_state == KernelState::Running {
+            if session.watchdog_set.expired() {
+                try!(host_write(stream, host::Reply::WatchdogExpired));
+                return Err(io_error("watchdog expired"))
+            }
+
+            if !rtio_crg::check() {
+                try!(host_write(stream, host::Reply::ClockFailure));
+                return Err(io_error("RTIO clock failure"))
+            }
+        }
+
+        try!(waiter.relinquish())
+    }
+}
+
+fn flash_kernel_worker(waiter: Waiter,
+                       congress: &mut Congress,
+                       config_key: &str) -> io::Result<()> {
+    let mut session = Session::new(congress);
+
+    let kernel = config::read_to_end(config_key);
+    if kernel.len() == 0 {
+        return Err(io::Error::new(io::ErrorKind::NotFound, "kernel not found"))
+    }
+
+    try!(unsafe { kern_load(waiter, &mut session, &kernel) });
+    try!(kern_run(&mut session));
+
+    loop {
+        if !rpc_queue::empty() {
+            return Err(io_error("unexpected background RPC in flash kernel"))
+        }
+
+        if mailbox::receive() != 0 {
+            if try!(process_kern_message(waiter, None, &mut session)) {
+                return Ok(())
+            }
+        }
+
+        if session.watchdog_set.expired() {
+            return Err(io_error("watchdog expired"))
+        }
+
+        if !rtio_crg::check() {
+            return Err(io_error("RTIO clock failure"))
+        }
+
+        try!(waiter.relinquish())
+    }
+}
+
+fn respawn<F>(spawner: Spawner, waiter: Waiter,
+              handle: &mut Option<ThreadHandle>,
+              f: F) where F: 'static + FnOnce(Waiter, Spawner) + Send {
+    match handle.take() {
+        None => (),
+        Some(handle) => {
+            if !handle.terminated() {
+                info!("terminating running kernel");
+                handle.interrupt();
+                waiter.join(handle).expect("cannot join interrupt thread")
+            }
+        }
+    }
+
+    *handle = Some(spawner.spawn(16384, f))
+}
+
+pub fn thread(waiter: Waiter, spawner: Spawner) {
+    let congress = Urc::new(RefCell::new(Congress::new()));
+
+    info!("running startup kernel");
+    match flash_kernel_worker(waiter, &mut congress.borrow_mut(), "startup_kernel") {
+        Ok(()) => info!("startup kernel finished"),
+        Err(err) => {
+            if err.kind() == io::ErrorKind::NotFound {
+                info!("no startup kernel found")
+            } else {
+                error!("startup kernel aborted: {}", err);
+            }
+        }
+    }
+
+    let addr = SocketAddr::new(IP_ANY, 1381);
+    let listener = TcpListener::bind(waiter, addr).expect("cannot bind socket");
+    listener.set_keepalive(true);
+    info!("accepting network sessions in Rust");
+
+    let mut kernel_thread = None;
+    loop {
+        if listener.acceptable() {
+            let (mut stream, addr) = listener.accept().expect("cannot accept client");
+            match check_magic(&mut stream) {
+                Ok(()) => (),
+                Err(_) => continue
+            }
+            info!("new connection from {}", addr);
+
+            let stream = stream.into_lower();
+            let congress = congress.clone();
+            respawn(spawner.clone(), waiter, &mut kernel_thread, move |waiter, _spawner| {
+                let mut stream = TcpStream::from_lower(waiter, stream);
+                let mut congress = congress.borrow_mut();
+                match host_kernel_worker(waiter, &mut stream, &mut congress) {
+                    Ok(()) => (),
+                    Err(err) => {
+                        if err.kind() == io::ErrorKind::UnexpectedEof {
+                            info!("connection closed");
+                        } else {
+                            error!("session aborted: {}", err);
+                        }
+                    }
+                }
+            })
+        }
+
+        if kernel_thread.as_ref().map_or(true, |h| h.terminated()) {
+            info!("no connection, starting idle kernel");
+
+            let congress = congress.clone();
+            respawn(spawner.clone(), waiter, &mut kernel_thread, move |waiter, _spawner| {
+                let mut congress = congress.borrow_mut();
+                match flash_kernel_worker(waiter, &mut congress, "idle_kernel") {
+                    Ok(()) =>
+                        info!("idle kernel finished, standing by"),
+                    Err(err) => {
+                        if err.kind() == io::ErrorKind::Interrupted {
+                            info!("idle kernel interrupted");
+                        } else if err.kind() == io::ErrorKind::NotFound {
+                            info!("no idle kernel found");
+                            while waiter.relinquish().is_ok() {}
+                        } else {
+                            error!("idle kernel aborted: {}", err);
+                        }
+                    }
+                }
+            })
+        }
+
+        let _ = waiter.relinquish();
+    }
+}

artiq/runtime.rs/src/session_proto.rs

@@ -0,0 +1,198 @@
+use std::prelude::v1::*;
+use std::io::{self, Read, Write};
+use proto::*;
+
+fn read_sync(reader: &mut Read) -> io::Result<()> {
+    let mut sync = [0; 4];
+    for i in 0.. {
+        sync[i % 4] = try!(read_u8(reader));
+        if sync == [0x5a; 4] { break }
+    }
+    Ok(())
+}
+
+fn write_sync(writer: &mut Write) -> io::Result<()> {
+    writer.write_all(&[0x5a; 4])
+}
+
+#[derive(Debug)]
+pub enum Request {
+    Log,
+    LogClear,
+
+    Ident,
+    SwitchClock(u8),
+
+    LoadKernel(Vec<u8>),
+    RunKernel,
+
+    RpcReply { tag: Vec<u8> },
+    RpcException {
+        name:     String,
+        message:  String,
+        param:    [u64; 3],
+        file:     String,
+        line:     u32,
+        column:   u32,
+        function: String,
+    },
+
+    FlashRead   { key: String },
+    FlashWrite  { key: String, value: Vec<u8> },
+    FlashRemove { key: String },
+    FlashErase,
+}
+
+impl Request {
+    pub fn read_from(reader: &mut Read) -> io::Result<Request> {
+        try!(read_sync(reader));
+        Ok(match try!(read_u8(reader)) {
+            1  => Request::Log,
+            2  => Request::LogClear,
+            3  => Request::Ident,
+            4  => Request::SwitchClock(try!(read_u8(reader))),
+            5  => Request::LoadKernel(try!(read_bytes(reader))),
+            6  => Request::RunKernel,
+            7  => Request::RpcReply {
+                tag: try!(read_bytes(reader))
+            },
+            8  => Request::RpcException {
+                name:     try!(read_string(reader)),
+                message:  try!(read_string(reader)),
+                param:    [try!(read_u64(reader)),
+                           try!(read_u64(reader)),
+                           try!(read_u64(reader))],
+                file:     try!(read_string(reader)),
+                line:     try!(read_u32(reader)),
+                column:   try!(read_u32(reader)),
+                function: try!(read_string(reader))
+            },
+            9  => Request::FlashRead {
+                key: try!(read_string(reader))
+            },
+            10 => Request::FlashWrite {
+                key:   try!(read_string(reader)),
+                value: try!(read_bytes(reader))
+            },
+            11 => Request::FlashErase,
+            12 => Request::FlashRemove {
+                key: try!(read_string(reader))
+            },
+            _  => return Err(io::Error::new(io::ErrorKind::InvalidData, "unknown request type"))
+        })
+    }
+}
+
+#[derive(Debug)]
+pub enum Reply<'a> {
+    Log(&'a str),
+
+    Ident(&'a str),
+    ClockSwitchCompleted,
+    ClockSwitchFailed,
+
+    LoadCompleted,
+    LoadFailed,
+
+    KernelFinished,
+    KernelStartupFailed,
+    KernelException {
+        name:      &'a str,
+        message:   &'a str,
+        param:     [u64; 3],
+        file:      &'a str,
+        line:      u32,
+        column:    u32,
+        function:  &'a str,
+        backtrace: &'a [usize]
+    },
+
+    RpcRequest { async: bool },
+
+    FlashRead(&'a [u8]),
+    FlashOk,
+    FlashError,
+
+    WatchdogExpired,
+    ClockFailure,
+}
+
+impl<'a> Reply<'a> {
+    pub fn write_to(&self, writer: &mut Write) -> io::Result<()> {
+        try!(write_sync(writer));
+        match *self {
+            Reply::Log(ref log) => {
+                try!(write_u8(writer, 1));
+                try!(write_string(writer, log));
+            },
+
+            Reply::Ident(ident) => {
+                try!(write_u8(writer, 2));
+                try!(writer.write(b"AROR"));
+                try!(write_string(writer, ident));
+            },
+            Reply::ClockSwitchCompleted => {
+                try!(write_u8(writer, 3));
+            },
+            Reply::ClockSwitchFailed => {
+                try!(write_u8(writer, 4));
+            },
+
+            Reply::LoadCompleted => {
+                try!(write_u8(writer, 5));
+            },
+            Reply::LoadFailed => {
+                try!(write_u8(writer, 6));
+            },
+
+            Reply::KernelFinished => {
+                try!(write_u8(writer, 7));
+            },
+            Reply::KernelStartupFailed => {
+                try!(write_u8(writer, 8));
+            },
+            Reply::KernelException {
+                name, message, param, file, line, column, function, backtrace
+            } => {
+                try!(write_u8(writer, 9));
+                try!(write_string(writer, name));
+                try!(write_string(writer, message));
+                try!(write_u64(writer, param[0]));
+                try!(write_u64(writer, param[1]));
+                try!(write_u64(writer, param[2]));
+                try!(write_string(writer, file));
+                try!(write_u32(writer, line));
+                try!(write_u32(writer, column));
+                try!(write_string(writer, function));
+                try!(write_u32(writer, backtrace.len() as u32));
+                for &addr in backtrace {
+                    try!(write_u32(writer, addr as u32))
+                }
+            },
+
+            Reply::RpcRequest { async } => {
+                try!(write_u8(writer, 10));
+                try!(write_u8(writer, async as u8));
+            },
+
+            Reply::FlashRead(ref bytes) => {
+                try!(write_u8(writer, 11));
+                try!(write_bytes(writer, bytes));
+            },
+            Reply::FlashOk => {
+                try!(write_u8(writer, 12));
+            },
+            Reply::FlashError => {
+                try!(write_u8(writer, 13));
+            },
+
+            Reply::WatchdogExpired => {
+                try!(write_u8(writer, 14));
+            },
+            Reply::ClockFailure => {
+                try!(write_u8(writer, 15));
+            },
+        }
+        Ok(())
+    }
+}

artiq/runtime.rs/src/urc.rs

@@ -0,0 +1,31 @@
+use std::rc::Rc;
+use std::ops::Deref;
+use std::fmt;
+
+pub struct Urc<T: ?Sized>(Rc<T>);
+
+impl<T> Urc<T> {
+    pub fn new(value: T) -> Urc<T> { Urc(Rc::new(value)) }
+}
+
+unsafe impl<T: ?Sized> Send for Urc<T> {}
+
+unsafe impl<T: ?Sized> Sync for Urc<T> {}
+
+impl<T: ?Sized> Deref for Urc<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target { self.0.deref() }
+}
+
+impl<T: ?Sized> Clone for Urc<T> {
+    fn clone(&self) -> Urc<T> {
+        Urc(self.0.clone())
+    }
+}
+
+impl<T: ?Sized + fmt::Debug> fmt::Debug for Urc<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Debug::fmt(&**self, f)
+    }
+}

artiq/runtime/Makefile

@@ -3,23 +3,75 @@ include $(MISOC_DIRECTORY)/software/common.mak
 
 PYTHON ?= python3.5
 
-OBJECTS := isr.o clock.o rtiocrg.o flash_storage.o mailbox.o \
-	session.o log.o analyzer.o moninj.o net_server.o bridge_ctl.o \
-	ksupport_data.o kloader.o test_mode.o main.o
-OBJECTS_KSUPPORT := ksupport.o artiq_personality.o mailbox.o \
-	bridge.o rtio.o dds.o i2c.o ad9154.o
+OBJECTS := flash_storage.o main.o
+OBJECTS_KSUPPORT := ksupport_glue.o artiq_personality.o rtio.o dds.o i2c.o ad9154.o
 
-CFLAGS += -I$(LIBALLOC_DIRECTORY) \
+RUSTOUT_DIRECTORY := cargo/or1k-unknown-none/debug
+CORE_IO_COMMIT := d40c593f42fafbac1ff3d827f6df96338b5b7d8b
+export CORE_IO_COMMIT
+
+CFLAGS += \
+	-I$(LIBALLOC_DIRECTORY) \
 	-I$(MISOC_DIRECTORY)/software/include/dyld \
 	-I$(LIBDYLD_DIRECTORY)/include \
 	-I$(LIBUNWIND_DIRECTORY) \
 	-I$(LIBUNWIND_DIRECTORY)/../unwinder/include \
 	-I$(LIBLWIP_DIRECTORY)/../lwip/src/include \
-	-I$(LIBLWIP_DIRECTORY) \
-	-DNDEBUG
+	-I$(LIBLWIP_DIRECTORY)
+CFLAGS += -DNDEBUG
+
+LDFLAGS += --gc-sections \
+	-L../libcompiler-rt \
+	-L../libbase \
+	-L../libm \
+	-L../liballoc \
+	-L../libunwind \
+	-L../libdyld \
+	-L../liblwip
 
 all: runtime.bin runtime.fbi
 
+.PHONY: $(RUSTOUT_DIRECTORY)/libruntime.a
+$(RUSTOUT_DIRECTORY)/libruntime.a: ksupport.elf
+	CARGO_TARGET_DIR=$(realpath .)/cargo \
+		cargo rustc --verbose \
+			--manifest-path $(realpath $(RUNTIME_DIRECTORY)/../runtime.rs/Cargo.toml) \
+			--target=or1k-unknown-none -- \
+			$(shell cat $(BUILDINC_DIRECTORY)/generated/rust-cfg) \
+			-C target-feature=+mul,+div,+ffl1,+cmov,+addc -C opt-level=s \
+			-L../libcompiler-rt
+
+runtime.elf: $(OBJECTS) $(RUSTOUT_DIRECTORY)/libruntime.a
+	$(LD) $(LDFLAGS) \
+		-T $(RUNTIME_DIRECTORY)/runtime.ld \
+		-o $@ \
+		$^ \
+		-lbase-nofloat -lcompiler-rt -lalloc -llwip
+	@chmod -x $@
+
+.PHONY: $(RUSTOUT_DIRECTORY)/libksupport.a
+$(RUSTOUT_DIRECTORY)/libksupport.a:
+	CARGO_TARGET_DIR=$(realpath .)/cargo \
+		cargo rustc --verbose \
+			--manifest-path $(realpath $(RUNTIME_DIRECTORY)/../runtime.rs/libksupport/Cargo.toml) \
+			--target=or1k-unknown-none -- \
+			$(shell cat $(BUILDINC_DIRECTORY)/generated/rust-cfg) \
+			--cfg ksupport \
+			-C target-feature=+mul,+div,+ffl1,+cmov,+addc -C opt-level=s \
+			-L../libcompiler-rt
+
+ksupport.elf: $(OBJECTS_KSUPPORT) $(RUSTOUT_DIRECTORY)/libksupport.a
+	$(LD) $(LDFLAGS) \
+		--eh-frame-hdr \
+		-T $(RUNTIME_DIRECTORY)/ksupport.ld \
+		-o $@ \
+		$^ \
+		-lbase -lm -lcompiler-rt -ldyld -lunwind
+	@chmod -x $@
+
+%.o: $(RUNTIME_DIRECTORY)/%.c
+	$(compile)
+
 %.bin: %.elf
 	$(OBJCOPY) -O binary $< $@
 	@chmod -x $@
@@ -27,56 +79,10 @@ all: runtime.bin runtime.fbi
 %.fbi: %.bin
 	@echo " MSCIMG  " $@ && $(PYTHON) -m misoc.tools.mkmscimg -f -o $@ $<
 
-runtime.elf: $(OBJECTS) libartiq_rust.a
-	$(LD) $(LDFLAGS) \
-		--gc-sections \
-		-T $(RUNTIME_DIRECTORY)/runtime.ld \
-		-N -o $@ \
-		../libbase/crt0-$(CPU).o \
-		$(OBJECTS) \
-		-L../libcompiler-rt \
-		-L../libbase \
-		-L../libm \
-		-L../liballoc \
-		-L../liblwip \
-		-Lcargo/or1k-unknown-none/debug/ \
-		-lartiq_rust -lbase -lm -lcompiler-rt -lalloc -llwip
-	@chmod -x $@
-
-ksupport.elf: $(OBJECTS_KSUPPORT)
-	$(LD) $(LDFLAGS) \
-		--eh-frame-hdr \
-		-T $(RUNTIME_DIRECTORY)/ksupport.ld \
-		-N -o $@ \
-		../libbase/crt0-$(CPU).o \
-		$^ \
-		-L../libbase \
-		-L../libcompiler-rt \
-		-L../libunwind \
-		-L../libdyld \
-		-lbase-nofloat -lcompiler-rt -ldyld -lunwind
-	@chmod -x $@
-
-ksupport_data.o: ksupport.elf
-	$(LD) -r -b binary -o $@ $<
-
-libartiq_rust.a:
-	CARGO_TARGET_DIR="./cargo" \
-		cargo rustc --verbose \
-			--manifest-path $(RUNTIME_DIRECTORY)/../runtime.rs/Cargo.toml \
-			--target=or1k-unknown-none -- \
-			-C target-feature=+mul,+div,+ffl1,+cmov,+addc -C opt-level=s \
-			-L../libcompiler-rt
-
-%.o: $(RUNTIME_DIRECTORY)/%.c
-	$(compile)
-
-%.o: $(RUNTIME_DIRECTORY)/%.S
-	$(assemble)
-
 clean:
 	$(RM) $(OBJECTS) $(OBJECTS_KSUPPORT)
 	$(RM) runtime.elf runtime.bin runtime.fbi .*~ *~
 	$(RM) ksupport.elf ksupport.bin
+	$(RM) -rf cargo
 
 .PHONY: all clean

artiq/runtime/analyzer.c

@@ -1,158 +0,0 @@
-#include <system.h>
-#include <generated/csr.h>
-
-#include "log.h"
-#include "analyzer.h"
-
-
-#ifdef CSR_RTIO_ANALYZER_BASE
-
-struct analyzer_header {
-    unsigned int sent_bytes;
-    unsigned long long int total_byte_count;
-    unsigned char overflow_occured;
-    unsigned char log_channel;
-    unsigned char dds_onehot_sel;
-} __attribute__((packed));
-
-
-#define ANALYZER_BUFFER_SIZE (512*1024)
-
-static struct analyzer_header analyzer_header;
-static char analyzer_buffer[ANALYZER_BUFFER_SIZE] __attribute__((aligned(64)));
-
-static void arm(void)
-{
-    rtio_analyzer_message_encoder_overflow_reset_write(1);
-    rtio_analyzer_dma_base_address_write((unsigned int)analyzer_buffer);
-    rtio_analyzer_dma_last_address_write((unsigned int)analyzer_buffer + ANALYZER_BUFFER_SIZE - 1);
-    rtio_analyzer_dma_reset_write(1);
-    rtio_analyzer_enable_write(1);
-}
-
-static void disarm(void)
-{
-    rtio_analyzer_enable_write(0);
-    while(rtio_analyzer_busy_read());
-    flush_cpu_dcache();
-    flush_l2_cache();
-}
-
-void analyzer_init(void)
-{
-    arm();
-}
-
-enum {
-    SEND_STATE_HEADER,
-    SEND_STATE_POST_POINTER, /* send from pointer to end of buffer */
-    SEND_STATE_PRE_POINTER, /* send from start of buffer to pointer-1 */
-    SEND_STATE_TERMINATE
-};
-
-static int send_state;
-static int pointer;
-static int wraparound;
-static int offset_consumed;
-static int offset_sent;
-
-void analyzer_start(void)
-{
-    disarm();
-
-    analyzer_header.total_byte_count = rtio_analyzer_dma_byte_count_read();
-    pointer = analyzer_header.total_byte_count % ANALYZER_BUFFER_SIZE;
-    wraparound = analyzer_header.total_byte_count >= ANALYZER_BUFFER_SIZE;
-
-    if(wraparound)
-        analyzer_header.sent_bytes = ANALYZER_BUFFER_SIZE;
-    else
-        analyzer_header.sent_bytes = analyzer_header.total_byte_count;
-
-    analyzer_header.overflow_occured = rtio_analyzer_message_encoder_overflow_read();
-    analyzer_header.log_channel = CONFIG_RTIO_LOG_CHANNEL;
-#ifdef CONFIG_DDS_ONEHOT_SEL
-    analyzer_header.dds_onehot_sel = 1;
-#else
-    analyzer_header.dds_onehot_sel = 0;
-#endif
-
-    offset_consumed = 0;
-    offset_sent = 0;
-    send_state = SEND_STATE_HEADER;
-}
-
-void analyzer_end(void)
-{
-    arm();
-}
-
-int analyzer_input(void *data, int length)
-{
-    core_log("no input should be received by analyzer, dropping connection\n");
-    return -1;
-}
-
-void analyzer_poll(void **data, int *length, int *close_flag)
-{
-    *close_flag = 0;
-    switch(send_state) {
-        case SEND_STATE_HEADER:
-            *length = sizeof(struct analyzer_header) - offset_consumed;
-            *data = (char *)&analyzer_header + offset_consumed;
-            break;
-        case SEND_STATE_POST_POINTER:
-            *length = ANALYZER_BUFFER_SIZE - pointer - offset_consumed;
-            *data = analyzer_buffer + pointer + offset_consumed;
-            break;
-        case SEND_STATE_PRE_POINTER:
-            *length = pointer - offset_consumed;
-            *data = analyzer_buffer + offset_consumed;
-            break;
-        case SEND_STATE_TERMINATE:
-            *length = -1;
-            break;
-        default:
-            *length = 0;
-            break;
-    }
-}
-
-void analyzer_ack_consumed(int length)
-{
-    offset_consumed += length;
-}
-
-void analyzer_ack_sent(int length)
-{
-    offset_sent += length;
-    switch(send_state) {
-        case SEND_STATE_HEADER:
-            if(offset_sent >= sizeof(struct analyzer_header)) {
-                offset_consumed = 0;
-                offset_sent = 0;
-                if(wraparound)
-                    send_state = SEND_STATE_POST_POINTER;
-                else {
-                    if(pointer)
-                        send_state = SEND_STATE_PRE_POINTER;
-                    else
-                        send_state = SEND_STATE_TERMINATE;
-                }
-            }
-            break;
-        case SEND_STATE_POST_POINTER:
-            if(pointer + offset_consumed >= ANALYZER_BUFFER_SIZE) {
-                offset_consumed = 0;
-                offset_sent = 0;
-                send_state = SEND_STATE_PRE_POINTER;
-            }
-            break;
-        case SEND_STATE_PRE_POINTER:
-            if(offset_sent >= pointer)
-                send_state = SEND_STATE_TERMINATE;
-            break;
-    }
-}
-
-#endif

artiq/runtime/analyzer.h

@@ -1,14 +0,0 @@
-#ifndef __ANALYZER_H
-#define __ANALYZER_H
-
-void analyzer_init(void);
-
-void analyzer_start(void);
-void analyzer_end(void);
-
-int analyzer_input(void *data, int length);
-void analyzer_poll(void **data, int *length, int *close_flag);
-void analyzer_ack_consumed(int length);
-void analyzer_ack_sent(int length);
-
-#endif /* __ANALYZER_H */

artiq/runtime/artiq_personality.c

@@ -233,7 +233,7 @@ struct artiq_raised_exception {
   struct _Unwind_Exception unwind;
   struct artiq_exception artiq;
   int handled;
-  struct artiq_backtrace_item backtrace[1024];
+  uintptr_t backtrace[1024];
   size_t backtrace_size;
 };
 
@@ -303,8 +303,7 @@ static _Unwind_Reason_Code __artiq_uncaught_exception(
   uintptr_t pcOffset = pc - funcStart;
   EH_LOG("===> uncaught (pc=%p+%p)", (void*)funcStart, (void*)pcOffset);
 
-  inflight->backtrace[inflight->backtrace_size].function = funcStart;
-  inflight->backtrace[inflight->backtrace_size].offset = pcOffset;
+  inflight->backtrace[inflight->backtrace_size] = funcStart + pcOffset;
   ++inflight->backtrace_size;
 
   if(actions & _UA_END_OF_STACK) {

artiq/runtime/artiq_personality.h

@@ -17,11 +17,6 @@ struct artiq_exception {
   int64_t param[3];
 };
 
-struct artiq_backtrace_item {
-  intptr_t function;
-  intptr_t offset;
-};
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -48,7 +43,7 @@ void __artiq_reraise(void)
 
 /* Called by the runtime */
 void __artiq_terminate(struct artiq_exception *artiq_exn,
-                       struct artiq_backtrace_item *backtrace,
+                       uintptr_t *backtrace,
                        size_t backtrace_size)
         __attribute__((noreturn));
 

artiq/runtime/bridge.c

@@ -1,131 +0,0 @@
-#include "mailbox.h"
-#include "messages.h"
-#include "rtio.h"
-#include "ttl.h"
-#include "dds.h"
-#include "bridge.h"
-
-#define TIME_BUFFER (8000 << CONFIG_RTIO_FINE_TS_WIDTH)
-
-static void rtio_output_blind(int channel, int addr, int data)
-{
-    rtio_chan_sel_write(channel);
-#ifdef CSR_RTIO_O_ADDRESS_ADDR
-    rtio_o_address_write(addr);
-#endif
-    rtio_o_data_write(data);
-    rtio_o_timestamp_write(rtio_get_counter() + TIME_BUFFER);
-    rtio_o_we_write(1);
-}
-
-#if ((defined CONFIG_RTIO_DDS_COUNT) && (CONFIG_RTIO_DDS_COUNT > 0))
-static void dds_write(int bus_channel, int addr, int data)
-{
-    rtio_output_blind(bus_channel, addr, data);
-}
-
-static int dds_read(int bus_channel, int addr)
-{
-    int r;
-
-#ifdef CONFIG_DDS_AD9858
-#define DDS_READ_FLAG 128
-#endif
-#ifdef CONFIG_DDS_AD9914
-#define DDS_READ_FLAG 256
-#endif
-    dds_write(bus_channel, addr | DDS_READ_FLAG, 0);
-    while(rtio_i_status_read() & RTIO_I_STATUS_EMPTY);
-    r = rtio_i_data_read();
-    rtio_i_re_write(1);
-    return r;
-}
-#endif
-
-static void send_ready(void)
-{
-    struct msg_base msg;
-
-    msg.type = MESSAGE_TYPE_BRG_READY;
-    mailbox_send_and_wait(&msg);
-}
-
-void bridge_main(void)
-{
-    struct msg_base *umsg;
-
-    rtio_init();
-    send_ready();
-    while(1) {
-        umsg = mailbox_wait_and_receive();
-        switch(umsg->type) {
-            case MESSAGE_TYPE_BRG_TTL_OE: {
-                struct msg_brg_ttl_out *msg;
-
-                msg = (struct msg_brg_ttl_out *)umsg;
-                rtio_output_blind(msg->channel, TTL_OE_ADDR, msg->value);
-                mailbox_acknowledge();
-                break;
-            }
-            case MESSAGE_TYPE_BRG_TTL_O: {
-                struct msg_brg_ttl_out *msg;
-
-                msg = (struct msg_brg_ttl_out *)umsg;
-                rtio_output_blind(msg->channel, TTL_O_ADDR, msg->value);
-                mailbox_acknowledge();
-                break;
-            }
-#if ((defined CONFIG_RTIO_DDS_COUNT) && (CONFIG_RTIO_DDS_COUNT > 0))
-            case MESSAGE_TYPE_BRG_DDS_SEL: {
-                struct msg_brg_dds_sel *msg;
-
-                msg = (struct msg_brg_dds_sel *)umsg;
-                dds_write(msg->bus_channel, DDS_GPIO, msg->channel << 1);
-                mailbox_acknowledge();
-                break;
-            }
-            case MESSAGE_TYPE_BRG_DDS_RESET: {
-                unsigned int g;
-                struct msg_brg_dds_reset *msg;
-
-                msg = (struct msg_brg_dds_reset *)umsg;
-                g = dds_read(msg->bus_channel, DDS_GPIO);
-                dds_write(msg->bus_channel, DDS_GPIO, g | 1);
-                dds_write(msg->bus_channel, DDS_GPIO, g);
-
-                mailbox_acknowledge();
-                break;
-            }
-            case MESSAGE_TYPE_BRG_DDS_READ_REQUEST: {
-                struct msg_brg_dds_read_request *msg;
-                struct msg_brg_dds_read_reply rmsg;
-
-                msg = (struct msg_brg_dds_read_request *)umsg;
-                rmsg.type = MESSAGE_TYPE_BRG_DDS_READ_REPLY;
-                rmsg.data = dds_read(msg->bus_channel, msg->address);
-                mailbox_send_and_wait(&rmsg);
-                break;
-            }
-            case MESSAGE_TYPE_BRG_DDS_WRITE: {
-                struct msg_brg_dds_write *msg;
-
-                msg = (struct msg_brg_dds_write *)umsg;
-                dds_write(msg->bus_channel, msg->address, msg->data);
-                mailbox_acknowledge();
-                break;
-            }
-            case MESSAGE_TYPE_BRG_DDS_FUD: {
-                struct msg_brg_dds_fud *msg;
-
-                msg = (struct msg_brg_dds_fud *)umsg;
-                dds_write(msg->bus_channel, DDS_FUD, 0);
-                mailbox_acknowledge();
-                break;
-            }
-#endif /* CONFIG_RTIO_DDS_COUNT */
-            default:
-                mailbox_acknowledge();
-                break;
-        }
-    }
-}

artiq/runtime/bridge.h

@@ -1,6 +0,0 @@
-#ifndef __BRIDGE_H
-#define __BRIDGE_H
-
-void bridge_main(void);
-
-#endif /* __BRIDGE_H */

artiq/runtime/bridge_ctl.c

@@ -1,106 +0,0 @@
-#include <stdio.h>
-
-#include "kloader.h"
-#include "mailbox.h"
-#include "messages.h"
-#include "bridge_ctl.h"
-
-void brg_start(void)
-{
-    struct msg_base *umsg;
-
-    kloader_start_bridge();
-
-    while(1) {
-        umsg = mailbox_wait_and_receive();
-        if(umsg->type == MESSAGE_TYPE_BRG_READY) {
-            mailbox_acknowledge();
-            break;
-        } else {
-            printf("Warning: unexpected message %d from AMP bridge\n", umsg->type);
-            mailbox_acknowledge();
-        }
-    }
-}
-
-void brg_ttloe(int n, int value)
-{
-    struct msg_brg_ttl_out msg;
-
-    msg.type = MESSAGE_TYPE_BRG_TTL_OE;
-    msg.channel = n;
-    msg.value = value;
-    mailbox_send_and_wait(&msg);
-}
-
-void brg_ttlo(int n, int value)
-{
-    struct msg_brg_ttl_out msg;
-
-    msg.type = MESSAGE_TYPE_BRG_TTL_O;
-    msg.channel = n;
-    msg.value = value;
-    mailbox_send_and_wait(&msg);
-}
-
-void brg_ddssel(int bus_channel, int channel)
-{
-    struct msg_brg_dds_sel msg;
-
-    msg.type = MESSAGE_TYPE_BRG_DDS_SEL;
-    msg.bus_channel = bus_channel;
-    msg.channel = channel;
-    mailbox_send_and_wait(&msg);
-}
-
-void brg_ddsreset(int bus_channel)
-{
-    struct msg_brg_dds_reset msg;
-
-    msg.type = MESSAGE_TYPE_BRG_DDS_RESET;
-    msg.bus_channel = bus_channel;
-    mailbox_send_and_wait(&msg);
-}
-
-unsigned int brg_ddsread(int bus_channel, unsigned int address)
-{
-    struct msg_brg_dds_read_request msg;
-    struct msg_brg_dds_read_reply *rmsg;
-    unsigned int r;
-
-    msg.type = MESSAGE_TYPE_BRG_DDS_READ_REQUEST;
-    msg.bus_channel = bus_channel;
-    msg.address = address;
-    mailbox_send(&msg);
-    while(1) {
-        rmsg = mailbox_wait_and_receive();
-        if(rmsg->type == MESSAGE_TYPE_BRG_DDS_READ_REPLY) {
-            r = rmsg->data;
-            mailbox_acknowledge();
-            return r;
-        } else {
-            printf("Warning: unexpected message %d from AMP bridge\n", rmsg->type);
-            mailbox_acknowledge();
-        }
-    }
-}
-
-void brg_ddswrite(int bus_channel, unsigned int address, unsigned int data)
-{
-    struct msg_brg_dds_write msg;
-
-    msg.type = MESSAGE_TYPE_BRG_DDS_WRITE;
-    msg.bus_channel = bus_channel;
-    msg.address = address;
-    msg.data = data;
-    mailbox_send_and_wait(&msg);
-}
-
-void brg_ddsfud(int bus_channel)
-{
-    struct msg_brg_dds_fud msg;
-
-    msg.type = MESSAGE_TYPE_BRG_DDS_FUD;
-    msg.bus_channel = bus_channel;
-    mailbox_send_and_wait(&msg);
-}

artiq/runtime/bridge_ctl.h

@@ -1,15 +0,0 @@
-#ifndef __BRIDGE_CTL_H
-#define __BRIDGE_CTL_H
-
-void brg_start(void);
-
-void brg_ttloe(int n, int value);
-void brg_ttlo(int n, int value);
-
-void brg_ddssel(int bus_channel, int channel);
-void brg_ddsreset(int bus_channel);
-unsigned int brg_ddsread(int bus_channel, unsigned int address);
-void brg_ddswrite(int bus_channel, unsigned int address, unsigned int data);
-void brg_ddsfud(int bus_channel);
-
-#endif /* __BRIDGE_CTL_H */

artiq/runtime/clock.c

@@ -1,89 +0,0 @@
-#include <generated/csr.h>
-
-#include "log.h"
-#include "clock.h"
-
-
-void clock_init(void)
-{
-    timer0_en_write(0);
-    timer0_load_write(0x7fffffffffffffffLL);
-    timer0_reload_write(0x7fffffffffffffffLL);
-    timer0_en_write(1);
-}
-
-long long int clock_get_ms(void)
-{
-    long long int clock_sys;
-    long long int clock_ms;
-
-    timer0_update_value_write(1);
-    clock_sys = 0x7fffffffffffffffLL - timer0_value_read();
-
-    clock_ms = clock_sys/(CONFIG_CLOCK_FREQUENCY/1000);
-    return clock_ms;
-}
-
-void busywait_us(long long int us)
-{
-    long long int threshold;
-
-    timer0_update_value_write(1);
-    threshold = timer0_value_read() - us*CONFIG_CLOCK_FREQUENCY/1000000LL;
-    while(timer0_value_read() > threshold)
-        timer0_update_value_write(1);
-}
-
-struct watchdog {
-    int active;
-    long long int threshold;
-};
-
-static struct watchdog watchdogs[MAX_WATCHDOGS];
-
-void watchdog_init(void)
-{
-    int i;
-
-    for(i=0;i<MAX_WATCHDOGS;i++)
-        watchdogs[i].active = 0;
-}
-
-int watchdog_set(int ms)
-{
-    int i, id;
-
-    id = -1;
-    for(i=0;i<MAX_WATCHDOGS;i++)
-        if(!watchdogs[i].active) {
-            id = i;
-            break;
-        }
-    if(id < 0) {
-        core_log("WARNING: Failed to add watchdog\n");
-        return id;
-    }
-
-    watchdogs[id].active = 1;
-    watchdogs[id].threshold = clock_get_ms() + ms;
-    return id;
-}
-
-void watchdog_clear(int id)
-{
-    if((id < 0) || (id >= MAX_WATCHDOGS))
-        return;
-    watchdogs[id].active = 0;
-}
-
-int watchdog_expired(void)
-{
-    int i;
-    long long int t;
-
-    t = 0x7fffffffffffffffLL;
-    for(i=0;i<MAX_WATCHDOGS;i++)
-        if(watchdogs[i].active && (watchdogs[i].threshold < t))
-            t = watchdogs[i].threshold;
-    return clock_get_ms() > t;
-}

artiq/runtime/clock.h

@@ -1,15 +0,0 @@
-#ifndef __CLOCK_H
-#define __CLOCK_H
-
-void clock_init(void);
-long long int clock_get_ms(void);
-void busywait_us(long long us);
-
-#define MAX_WATCHDOGS 16
-
-void watchdog_init(void);
-int watchdog_set(int ms);
-void watchdog_clear(int id);
-int watchdog_expired(void);
-
-#endif /* __CLOCK_H */

artiq/runtime/dds.c

@@ -6,7 +6,6 @@
 
 #include "artiq_personality.h"
 #include "rtio.h"
-#include "log.h"
 #include "dds.h"
 
 #define DURATION_WRITE (5 << CONFIG_RTIO_FINE_TS_WIDTH)

artiq/runtime/flash_storage.c

@@ -9,7 +9,6 @@
 #include <generated/mem.h>
 #include <generated/csr.h>
 
-#include "log.h"
 #include "flash_storage.h"
 
 #if (defined CSR_SPIFLASH_BASE && defined CONFIG_SPIFLASH_PAGE_SIZE)
@@ -63,24 +62,24 @@ static int record_iter_next(struct iter_state *is, struct record *record, int *f
         return 0;
 
     if(record->size < 6) {
-        core_log("flash_storage might be corrupted: record size is %u (<6) at address %08x\n",
-                 record->size, record->raw_record);
+        // core_log("flash_storage might be corrupted: record size is %u (<6) at address %08x\n",
+        //          record->size, record->raw_record);
         if(fatal)
             *fatal = 1;
         return 0;
     }
 
     if(is->seek > is->buf_len - sizeof(record->size) - 2) { /* 2 is the minimum key length */
-        core_log("flash_storage might be corrupted: END_MARKER missing at the end of "
-                 "the storage sector\n");
+        // core_log("flash_storage might be corrupted: END_MARKER missing at the end of "
+        //          "the storage sector\n");
         if(fatal)
             *fatal = 1;
         return 0;
     }
 
     if(record->size > is->buf_len - is->seek) {
-        core_log("flash_storage might be corrupted: invalid record_size %d at address %08x\n",
-                 record->size, record->raw_record);
+        // core_log("flash_storage might be corrupted: invalid record_size %d at address %08x\n",
+        //          record->size, record->raw_record);
         if(fatal)
             *fatal = 1;
         return 0;
@@ -90,8 +89,8 @@ static int record_iter_next(struct iter_state *is, struct record *record, int *f
     record->key_len = strnlen(record->key, record->size - sizeof(record->size)) + 1;
 
     if(record->key_len == record->size - sizeof(record->size) + 1) {
-        core_log("flash_storage might be corrupted: invalid key length at address %08x\n",
-                 record->raw_record);
+        // core_log("flash_storage might be corrupted: invalid key length at address %08x\n",
+        //          record->raw_record);
         if(fatal)
             *fatal = 1;
         return 0;
@@ -265,7 +264,7 @@ int fs_write(const char *key, const void *buffer, unsigned int buf_len)
         return 0; // Storage is definitely full.
 
 fatal_error:
-    core_log("fatal error: flash storage might be corrupted\n");
+    // core_log("fatal error: flash storage might be corrupted\n");
     return 0;
 }
 
@@ -295,8 +294,8 @@ unsigned int fs_read(const char *key, void *buffer, unsigned int buf_len, unsign
         }
     }
 
-    if(fatal)
-        core_log("fatal error: flash storage might be corrupted\n");
+    // if(fatal)
+    //     core_log("fatal error: flash storage might be corrupted\n");
 
     return read_length;
 }

artiq/runtime/isr.c

@@ -1,14 +0,0 @@
-#include <generated/csr.h>
-#include <irq.h>
-#include <uart.h>
-
-void isr(void);
-void isr(void)
-{
-    unsigned int irqs;
-    
-    irqs = irq_pending() & irq_getmask();
-    
-    if(irqs & (1 << UART_INTERRUPT))
-        uart_isr();
-}

artiq/runtime/kloader.c

@@ -1,206 +0,0 @@
-#include <string.h>
-#include <generated/csr.h>
-
-#include <dyld.h>
-
-#include "kloader.h"
-#include "log.h"
-#include "clock.h"
-#include "flash_storage.h"
-#include "mailbox.h"
-#include "messages.h"
-
-static void start_kernel_cpu(struct msg_load_request *msg)
-{
-    // Stop kernel CPU before messing with its code.
-    kernel_cpu_reset_write(1);
-
-    // Load kernel support code.
-    extern void _binary_ksupport_elf_start, _binary_ksupport_elf_end;
-    memcpy((void *)(KERNELCPU_EXEC_ADDRESS - KSUPPORT_HEADER_SIZE),
-           &_binary_ksupport_elf_start,
-           &_binary_ksupport_elf_end - &_binary_ksupport_elf_start);
-
-    // Start kernel CPU.
-    mailbox_send(msg);
-    kernel_cpu_reset_write(0);
-}
-
-void kloader_start_bridge()
-{
-    start_kernel_cpu(NULL);
-}
-
-static int load_or_start_kernel(const void *library, int run_kernel)
-{
-    static struct dyld_info library_info;
-    struct msg_load_request request = {
-        .library      = library,
-        .library_info = &library_info,
-        .run_kernel   = run_kernel,
-    };
-    start_kernel_cpu(&request);
-
-    struct msg_load_reply *reply = mailbox_wait_and_receive();
-    mailbox_acknowledge();
-
-    if(reply->type != MESSAGE_TYPE_LOAD_REPLY) {
-        core_log("BUG: unexpected reply to load/run request\n");
-        return 0;
-    }
-
-    if(reply->error != NULL) {
-        core_log("cannot load kernel: %s\n", reply->error);
-        return 0;
-    }
-
-    return 1;
-}
-
-int kloader_load_library(const void *library)
-{
-    if(!kernel_cpu_reset_read()) {
-        core_log("BUG: attempted to load kernel library while kernel CPU is running\n");
-        return 0;
-    }
-
-    return load_or_start_kernel(library, 0);
-}
-
-void kloader_filter_backtrace(struct artiq_backtrace_item *backtrace,
-                              size_t *backtrace_size) {
-    struct artiq_backtrace_item *cursor = backtrace;
-
-    // Remove all backtrace items belonging to ksupport and subtract
-    // shared object base from the addresses.
-    for(int i = 0; i < *backtrace_size; i++) {
-        if(backtrace[i].function > KERNELCPU_PAYLOAD_ADDRESS) {
-            backtrace[i].function -= KERNELCPU_PAYLOAD_ADDRESS;
-            *cursor++ = backtrace[i];
-        }
-    }
-
-    *backtrace_size = cursor - backtrace;
-}
-
-void kloader_start_kernel()
-{
-    load_or_start_kernel(NULL, 1);
-}
-
-static int kloader_start_flash_kernel(char *key)
-{
-#if (defined CSR_SPIFLASH_BASE && defined CONFIG_SPIFLASH_PAGE_SIZE)
-    char buffer[32*1024];
-    unsigned int length, remain;
-
-    length = fs_read(key, buffer, sizeof(buffer), &remain);
-    if(length <= 0)
-        return 0;
-
-    if(remain) {
-        core_log("ERROR: kernel %s is too large\n", key);
-        return 0;
-    }
-
-    return load_or_start_kernel(buffer, 1);
-#else
-    return 0;
-#endif
-}
-
-int kloader_start_startup_kernel(void)
-{
-    return kloader_start_flash_kernel("startup_kernel");
-}
-
-int kloader_start_idle_kernel(void)
-{
-    return kloader_start_flash_kernel("idle_kernel");
-}
-
-void kloader_stop(void)
-{
-    kernel_cpu_reset_write(1);
-    mailbox_acknowledge();
-}
-
-int kloader_validate_kpointer(void *p)
-{
-    unsigned int v = (unsigned int)p;
-    if((v < KERNELCPU_EXEC_ADDRESS) || (v > KERNELCPU_LAST_ADDRESS)) {
-        core_log("Received invalid pointer from kernel CPU: 0x%08x\n", v);
-        return 0;
-    }
-    return 1;
-}
-
-int kloader_is_essential_kmsg(int msgtype)
-{
-    switch(msgtype) {
-        case MESSAGE_TYPE_NOW_INIT_REQUEST:
-        case MESSAGE_TYPE_NOW_SAVE:
-        case MESSAGE_TYPE_LOG:
-        case MESSAGE_TYPE_WATCHDOG_SET_REQUEST:
-        case MESSAGE_TYPE_WATCHDOG_CLEAR:
-            return 1;
-        default:
-            return 0;
-    }
-}
-
-static long long int now = 0;
-
-void kloader_service_essential_kmsg(void)
-{
-    struct msg_base *umsg;
-
-    umsg = mailbox_receive();
-    if(umsg) {
-        if(!kloader_validate_kpointer(umsg))
-            return;
-        switch(umsg->type) {
-            case MESSAGE_TYPE_NOW_INIT_REQUEST: {
-                struct msg_now_init_reply reply;
-
-                reply.type = MESSAGE_TYPE_NOW_INIT_REPLY;
-                reply.now = now;
-                mailbox_send_and_wait(&reply);
-                break;
-            }
-            case MESSAGE_TYPE_NOW_SAVE: {
-                struct msg_now_save *msg = (struct msg_now_save *)umsg;
-
-                now = msg->now;
-                mailbox_acknowledge();
-                break;
-            }
-            case MESSAGE_TYPE_LOG: {
-                struct msg_log *msg = (struct msg_log *)umsg;
-
-                core_log_va(msg->fmt, msg->args);
-                mailbox_acknowledge();
-                break;
-            }
-            case MESSAGE_TYPE_WATCHDOG_SET_REQUEST: {
-                struct msg_watchdog_set_request *msg = (struct msg_watchdog_set_request *)umsg;
-                struct msg_watchdog_set_reply reply;
-
-                reply.type = MESSAGE_TYPE_WATCHDOG_SET_REPLY;
-                reply.id = watchdog_set(msg->ms);
-                mailbox_send_and_wait(&reply);
-                break;
-            }
-            case MESSAGE_TYPE_WATCHDOG_CLEAR: {
-                struct msg_watchdog_clear *msg = (struct msg_watchdog_clear *)umsg;
-
-                watchdog_clear(msg->id);
-                mailbox_acknowledge();
-                break;
-            }
-            default:
-                /* handled elsewhere */
-                break;
-        }
-    }
-}

artiq/runtime/kloader.h

@@ -1,25 +0,0 @@
-#ifndef __KLOADER_H
-#define __KLOADER_H
-
-#include "artiq_personality.h"
-
-#define KERNELCPU_EXEC_ADDRESS    0x42000000
-#define KERNELCPU_PAYLOAD_ADDRESS 0x42020000
-#define KERNELCPU_LAST_ADDRESS    (0x4fffffff - 1024*1024)
-#define KSUPPORT_HEADER_SIZE      0x80
-
-int kloader_load_library(const void *code);
-void kloader_filter_backtrace(struct artiq_backtrace_item *backtrace,
-                              size_t *backtrace_size);
-
-void kloader_start_bridge(void);
-int kloader_start_startup_kernel(void);
-int kloader_start_idle_kernel(void);
-void kloader_start_kernel(void);
-void kloader_stop(void);
-
-int kloader_validate_kpointer(void *p);
-int kloader_is_essential_kmsg(int msgtype);
-void kloader_service_essential_kmsg(void);
-
-#endif /* __KLOADER_H */

artiq/runtime/ksupport.c

@@ -1,624 +0,0 @@
-#include <stdarg.h>
-#include <string.h>
-#include <stdio.h>
-#include <generated/csr.h>
-
-#include <link.h>
-#include <dlfcn.h>
-#include <dyld.h>
-#include <unwind.h>
-
-#include "ksupport.h"
-#include "kloader.h"
-#include "mailbox.h"
-#include "messages.h"
-#include "bridge.h"
-#include "artiq_personality.h"
-#include "rtio.h"
-#include "dds.h"
-#include "i2c.h"
-#include "ad9154.h"
-
-double round(double x);
-double sqrt(double x);
-
-void ksupport_abort(void);
-static void attribute_writeback(void *);
-
-int64_t now;
-
-/* compiler-rt symbols */
-extern void __divsi3, __modsi3, __ledf2, __gedf2, __unorddf2, __eqdf2, __ltdf2,
-    __nedf2, __gtdf2, __negsf2, __negdf2, __addsf3, __subsf3, __mulsf3,
-    __divsf3, __lshrdi3, __muldi3, __divdi3, __ashldi3, __ashrdi3,
-    __udivmoddi4, __floatsisf, __floatunsisf, __fixsfsi, __fixunssfsi,
-    __adddf3, __subdf3, __muldf3, __divdf3, __floatsidf, __floatunsidf,
-    __floatdidf, __fixdfsi, __fixdfdi, __fixunsdfsi, __clzsi2, __ctzsi2,
-    __udivdi3, __umoddi3, __moddi3, __powidf2;
-
-/* artiq_personality symbols */
-extern void __artiq_personality;
-
-struct symbol {
-    const char *name;
-    void *addr;
-};
-
-static const struct symbol runtime_exports[] = {
-    /* compiler-rt */
-    {"__divsi3", &__divsi3},
-    {"__modsi3", &__modsi3},
-    {"__ledf2", &__ledf2},
-    {"__gedf2", &__gedf2},
-    {"__unorddf2", &__unorddf2},
-    {"__eqdf2", &__eqdf2},
-    {"__ltdf2", &__ltdf2},
-    {"__nedf2", &__nedf2},
-    {"__gtdf2", &__gtdf2},
-    {"__negsf2", &__negsf2},
-    {"__negdf2", &__negdf2},
-    {"__addsf3", &__addsf3},
-    {"__subsf3", &__subsf3},
-    {"__mulsf3", &__mulsf3},
-    {"__divsf3", &__divsf3},
-    {"__lshrdi3", &__lshrdi3},
-    {"__muldi3", &__muldi3},
-    {"__divdi3", &__divdi3},
-    {"__ashldi3", &__ashldi3},
-    {"__ashrdi3", &__ashrdi3},
-    {"__udivmoddi4", &__udivmoddi4},
-    {"__floatsisf", &__floatsisf},
-    {"__floatunsisf", &__floatunsisf},
-    {"__fixsfsi", &__fixsfsi},
-    {"__fixunssfsi", &__fixunssfsi},
-    {"__adddf3", &__adddf3},
-    {"__subdf3", &__subdf3},
-    {"__muldf3", &__muldf3},
-    {"__divdf3", &__divdf3},
-    {"__floatsidf", &__floatsidf},
-    {"__floatunsidf", &__floatunsidf},
-    {"__floatdidf", &__floatdidf},
-    {"__fixdfsi", &__fixdfsi},
-    {"__fixdfdi", &__fixdfdi},
-    {"__fixunsdfsi", &__fixunsdfsi},
-    {"__clzsi2", &__clzsi2},
-    {"__ctzsi2", &__ctzsi2},
-    {"__udivdi3", &__udivdi3},
-    {"__umoddi3", &__umoddi3},
-    {"__moddi3", &__moddi3},
-    {"__powidf2", &__powidf2},
-
-    /* libm */
-    {"round", &round},
-    {"sqrt", &sqrt},
-
-    /* exceptions */
-    {"_Unwind_Resume", &_Unwind_Resume},
-    {"__artiq_personality", &__artiq_personality},
-    {"__artiq_raise", &__artiq_raise},
-    {"__artiq_reraise", &__artiq_reraise},
-    {"strcmp", &strcmp},
-    {"strlen", &strlen},
-    {"abort", &ksupport_abort},
-
-    /* proxified syscalls */
-    {"core_log", &core_log},
-
-    {"now", &now},
-
-    {"watchdog_set", &watchdog_set},
-    {"watchdog_clear", &watchdog_clear},
-
-    {"printf", &core_log},
-    {"send_rpc", &send_rpc},
-    {"recv_rpc", &recv_rpc},
-
-    /* direct syscalls */
-    {"rtio_init", &rtio_init},
-    {"rtio_get_counter", &rtio_get_counter},
-    {"rtio_log", &rtio_log},
-    {"rtio_output", &rtio_output},
-    {"rtio_input_timestamp", &rtio_input_timestamp},
-    {"rtio_input_data", &rtio_input_data},
-
-#if ((defined CONFIG_RTIO_DDS_COUNT) && (CONFIG_RTIO_DDS_COUNT > 0))
-    {"dds_init", &dds_init},
-    {"dds_init_sync", &dds_init_sync},
-    {"dds_batch_enter", &dds_batch_enter},
-    {"dds_batch_exit", &dds_batch_exit},
-    {"dds_set", &dds_set},
-#endif
-
-    {"i2c_init", &i2c_init},
-    {"i2c_start", &i2c_start},
-    {"i2c_stop", &i2c_stop},
-    {"i2c_write", &i2c_write},
-    {"i2c_read", &i2c_read},
-
-    {"cache_get", &cache_get},
-    {"cache_put", &cache_put},
-
-#ifdef CONFIG_AD9154_DAC_CS
-    {"ad9154_init", &ad9154_init},
-    {"ad9154_write", &ad9154_write},
-    {"ad9154_read", &ad9154_read},
-    {"ad9516_write", &ad9516_write},
-    {"ad9516_read", &ad9516_read},
-    {"ad9154_jesd_enable", &ad9154_jesd_enable},
-    {"ad9154_jesd_ready", &ad9154_jesd_ready},
-    {"ad9154_jesd_prbs", &ad9154_jesd_prbs},
-    {"ad9154_jesd_stpl", &ad9154_jesd_stpl},
-#endif
-
-    /* end */
-    {NULL, NULL}
-};
-
-double round(double x)
-{
-    union {double f; uint64_t i;} u = {x};
-    int e = u.i >> 52 & 0x7ff;
-    double y;
-
-    if (e >= 0x3ff+52)
-        return x;
-    if (u.i >> 63)
-        x = -x;
-    if (e < 0x3ff-1) {
-        /* we don't do it in ARTIQ */
-        /* raise inexact if x!=0 */
-        // FORCE_EVAL(x + 0x1p52);
-        return 0*u.f;
-    }
-    y = (double)(x + 0x1p52) - 0x1p52 - x;
-    if (y > 0.5)
-        y = y + x - 1;
-    else if (y <= -0.5)
-        y = y + x + 1;
-    else
-        y = y + x;
-    if (u.i >> 63)
-        y = -y;
-    return y;
-}
-
-double sqrt(double x)
-{
-    static const double one = 1.0, tiny = 1.0e-300;
-    double z;
-    int32_t sign = (int)0x80000000;
-    int32_t ix0,s0,q,m,t,i;
-    uint32_t r,t1,s1,ix1,q1;
-
-    union {double f; struct{uint32_t msw; uint32_t lsw;};} u = {x};
-    ix0 = u.msw;
-    ix1 = u.lsw;
-
-    /* take care of Inf and NaN */
-    if((ix0&0x7ff00000)==0x7ff00000) {
-        return x*x+x;       /* sqrt(NaN)=NaN, sqrt(+inf)=+inf
-                       sqrt(-inf)=sNaN */
-    }
-    /* take care of zero */
-    if(ix0<=0) {
-        if(((ix0&(~sign))|ix1)==0) return x;/* sqrt(+-0) = +-0 */
-        else if(ix0<0)
-        return (x-x)/(x-x);     /* sqrt(-ve) = sNaN */
-    }
-    /* normalize x */
-    m = (ix0>>20);
-    if(m==0) {              /* subnormal x */
-        while(ix0==0) {
-        m -= 21;
-        ix0 |= (ix1>>11); ix1 <<= 21;
-        }
-        for(i=0;(ix0&0x00100000)==0;i++) ix0<<=1;
-        m -= i-1;
-        ix0 |= (ix1>>(32-i));
-        ix1 <<= i;
-    }
-    m -= 1023;  /* unbias exponent */
-    ix0 = (ix0&0x000fffff)|0x00100000;
-    if(m&1){    /* odd m, double x to make it even */
-        ix0 += ix0 + ((ix1&sign)>>31);
-        ix1 += ix1;
-    }
-    m >>= 1;    /* m = [m/2] */
-
-    /* generate sqrt(x) bit by bit */
-    ix0 += ix0 + ((ix1&sign)>>31);
-    ix1 += ix1;
-    q = q1 = s0 = s1 = 0;   /* [q,q1] = sqrt(x) */
-    r = 0x00200000;     /* r = moving bit from right to left */
-
-    while(r!=0) {
-        t = s0+r;
-        if(t<=ix0) {
-        s0   = t+r;
-        ix0 -= t;
-        q   += r;
-        }
-        ix0 += ix0 + ((ix1&sign)>>31);
-        ix1 += ix1;
-        r>>=1;
-    }
-
-    r = sign;
-    while(r!=0) {
-        t1 = s1+r;
-        t  = s0;
-        if((t<ix0)||((t==ix0)&&(t1<=ix1))) {
-        s1  = t1+r;
-        if(((t1&sign)==sign)&&(s1&sign)==0) s0 += 1;
-        ix0 -= t;
-        if (ix1 < t1) ix0 -= 1;
-        ix1 -= t1;
-        q1  += r;
-        }
-        ix0 += ix0 + ((ix1&sign)>>31);
-        ix1 += ix1;
-        r>>=1;
-    }
-
-    /* use floating add to find out rounding direction */
-    if((ix0|ix1)!=0) {
-        z = one-tiny; /* trigger inexact flag */
-        if (z>=one) {
-            z = one+tiny;
-            if (q1==(uint32_t)0xffffffff) { q1=0; q += 1;}
-        else if (z>one) {
-            if (q1==(uint32_t)0xfffffffe) q+=1;
-            q1+=2;
-        } else
-                q1 += (q1&1);
-        }
-    }
-    ix0 = (q>>1)+0x3fe00000;
-    ix1 =  q1>>1;
-    if ((q&1)==1) ix1 |= sign;
-    ix0 += (m <<20);
-
-    u.msw = ix0;
-    u.lsw = ix1;
-    return u.f;
-}
-
-/* called by libunwind */
-int fprintf(FILE *stream, const char *fmt, ...)
-{
-    struct msg_log request;
-
-    request.type = MESSAGE_TYPE_LOG;
-    request.fmt = fmt;
-    va_start(request.args, fmt);
-    mailbox_send_and_wait(&request);
-    va_end(request.args);
-
-    return 0;
-}
-
-/* called by libunwind */
-int dladdr (const void *address, Dl_info *info)
-{
-    /* we don't try to resolve names */
-    return 0;
-}
-
-/* called by libunwind */
-int dl_iterate_phdr (int (*callback)(struct dl_phdr_info *, size_t, void *), void *data)
-{
-    Elf32_Ehdr *ehdr;
-    struct dl_phdr_info phdr_info;
-    int retval;
-
-    ehdr = (Elf32_Ehdr *)(KERNELCPU_EXEC_ADDRESS - KSUPPORT_HEADER_SIZE);
-    phdr_info = (struct dl_phdr_info){
-        .dlpi_addr  = 0, /* absolutely linked */
-        .dlpi_name  = "<ksupport>",
-        .dlpi_phdr  = (Elf32_Phdr*) ((intptr_t)ehdr + ehdr->e_phoff),
-        .dlpi_phnum = ehdr->e_phnum,
-    };
-    retval = callback(&phdr_info, sizeof(phdr_info), data);
-    if(retval)
-        return retval;
-
-    ehdr = (Elf32_Ehdr *)KERNELCPU_PAYLOAD_ADDRESS;
-    phdr_info = (struct dl_phdr_info){
-        .dlpi_addr  = KERNELCPU_PAYLOAD_ADDRESS,
-        .dlpi_name  = "<kernel>",
-        .dlpi_phdr  = (Elf32_Phdr*) ((intptr_t)ehdr + ehdr->e_phoff),
-        .dlpi_phnum = ehdr->e_phnum,
-    };
-    retval = callback(&phdr_info, sizeof(phdr_info), data);
-    return retval;
-}
-
-static Elf32_Addr resolve_runtime_export(void *resolve_data,
-        const char *name)
-{
-    const struct symbol *sym = runtime_exports;
-    while(sym->name) {
-        if(!strcmp(sym->name, name))
-            return (Elf32_Addr)sym->addr;
-        ++sym;
-    }
-    return 0;
-}
-
-void exception_handler(unsigned long vect, unsigned long *regs,
-                       unsigned long pc, unsigned long ea);
-void exception_handler(unsigned long vect, unsigned long *regs,
-                       unsigned long pc, unsigned long ea)
-{
-    artiq_raise_from_c("InternalError",
-        "Hardware exception {0} at PC 0x{1:08x}, EA 0x{2:08x}",
-        vect, pc, ea);
-}
-
-static void now_init(void)
-{
-    struct msg_base request;
-    struct msg_now_init_reply *reply;
-
-    request.type = MESSAGE_TYPE_NOW_INIT_REQUEST;
-    mailbox_send_and_wait(&request);
-
-    reply = mailbox_wait_and_receive();
-    if(reply->type != MESSAGE_TYPE_NOW_INIT_REPLY) {
-        core_log("Malformed MESSAGE_TYPE_NOW_INIT_REQUEST reply type %d\n",
-                 reply->type);
-        while(1);
-    }
-    now = reply->now;
-    mailbox_acknowledge();
-}
-
-static void now_save(void)
-{
-    struct msg_now_save request;
-
-    request.type = MESSAGE_TYPE_NOW_SAVE;
-    request.now = now;
-    mailbox_send_and_wait(&request);
-}
-
-int main(void);
-int main(void)
-{
-    struct msg_load_request *request = mailbox_receive();
-    struct msg_load_reply load_reply = {
-        .type = MESSAGE_TYPE_LOAD_REPLY,
-        .error = NULL
-    };
-
-    if(request == NULL) {
-        bridge_main();
-        while(1);
-    }
-
-    if(request->library != NULL) {
-        if(!dyld_load(request->library, KERNELCPU_PAYLOAD_ADDRESS,
-                      resolve_runtime_export, NULL, request->library_info,
-                      &load_reply.error)) {
-            mailbox_send(&load_reply);
-            while(1);
-        }
-
-        void *__bss_start = dyld_lookup("__bss_start", request->library_info);
-        void *_end = dyld_lookup("_end", request->library_info);
-        memset(__bss_start, 0, _end - __bss_start);
-    }
-
-    if(request->run_kernel) {
-        void (*kernel_run)() = dyld_lookup("__modinit__", request->library_info);
-        void *typeinfo = dyld_lookup("typeinfo", request->library_info);
-
-        mailbox_send_and_wait(&load_reply);
-
-        now_init();
-        kernel_run();
-        now_save();
-
-        attribute_writeback(typeinfo);
-
-        struct msg_base finished_reply;
-        finished_reply.type = MESSAGE_TYPE_FINISHED;
-        mailbox_send_and_wait(&finished_reply);
-    } else {
-        mailbox_send(&load_reply);
-    }
-
-    while(1);
-}
-
-/* called from __artiq_personality */
-void __artiq_terminate(struct artiq_exception *artiq_exn,
-                       struct artiq_backtrace_item *backtrace,
-                       size_t backtrace_size)
-{
-    struct msg_exception msg;
-
-    now_save();
-
-    msg.type = MESSAGE_TYPE_EXCEPTION;
-    msg.exception = artiq_exn;
-    msg.backtrace = backtrace;
-    msg.backtrace_size = backtrace_size;
-    mailbox_send(&msg);
-
-    while(1);
-}
-
-void ksupport_abort()
-{
-    artiq_raise_from_c("InternalError", "abort() called; check device log for details",
-                       0, 0, 0);
-}
-
-int watchdog_set(int ms)
-{
-    struct msg_watchdog_set_request request;
-    struct msg_watchdog_set_reply *reply;
-    int id;
-
-    request.type = MESSAGE_TYPE_WATCHDOG_SET_REQUEST;
-    request.ms = ms;
-    mailbox_send_and_wait(&request);
-
-    reply = mailbox_wait_and_receive();
-    if(reply->type != MESSAGE_TYPE_WATCHDOG_SET_REPLY) {
-        core_log("Malformed MESSAGE_TYPE_WATCHDOG_SET_REQUEST reply type %d\n",
-                 reply->type);
-        while(1);
-    }
-    id = reply->id;
-    mailbox_acknowledge();
-
-    return id;
-}
-
-void watchdog_clear(int id)
-{
-    struct msg_watchdog_clear request;
-
-    request.type = MESSAGE_TYPE_WATCHDOG_CLEAR;
-    request.id = id;
-    mailbox_send_and_wait(&request);
-}
-
-void send_rpc(int service, const char *tag, ...)
-{
-    struct msg_rpc_send request;
-
-    if(service != 0)
-        request.type = MESSAGE_TYPE_RPC_SEND;
-    else
-        request.type = MESSAGE_TYPE_RPC_BATCH;
-    request.service = service;
-    request.tag = tag;
-    va_start(request.args, tag);
-    mailbox_send_and_wait(&request);
-    va_end(request.args);
-}
-
-int recv_rpc(void *slot)
-{
-    struct msg_rpc_recv_request request;
-    struct msg_rpc_recv_reply *reply;
-
-    request.type = MESSAGE_TYPE_RPC_RECV_REQUEST;
-    request.slot = slot;
-    mailbox_send_and_wait(&request);
-
-    reply = mailbox_wait_and_receive();
-    if(reply->type != MESSAGE_TYPE_RPC_RECV_REPLY) {
-        core_log("Malformed MESSAGE_TYPE_RPC_RECV_REQUEST reply type %d\n",
-                 reply->type);
-        while(1);
-    }
-
-    if(reply->exception) {
-        struct artiq_exception exception;
-        memcpy(&exception, reply->exception,
-               sizeof(struct artiq_exception));
-        mailbox_acknowledge();
-        __artiq_raise(&exception);
-    } else {
-        int alloc_size = reply->alloc_size;
-        mailbox_acknowledge();
-        return alloc_size;
-    }
-}
-
-struct attr_desc {
-    uint32_t offset;
-    const char *tag;
-    const char *name;
-};
-
-struct type_desc {
-    struct attr_desc **attributes;
-    void **objects;
-};
-
-void attribute_writeback(void *utypes)
-{
-    struct type_desc **types = (struct type_desc **)utypes;
-    while(*types) {
-        struct type_desc *type = *types++;
-
-        size_t attr_count = 0;
-        for(struct attr_desc **attr = type->attributes; *attr; attr++)
-            attr_count++;
-
-        void **objects = type->objects;
-        while(*objects) {
-            void *object = *objects++;
-
-            struct attr_desc **attrs = type->attributes;
-            while(*attrs) {
-                struct attr_desc *attr = *attrs++;
-
-                if(attr->tag) {
-                    uintptr_t value = (uintptr_t)object + attr->offset;
-                    send_rpc(0, attr->tag, &object, &attr->name, value);
-                }
-            }
-        }
-    }
-}
-
-struct artiq_list cache_get(const char *key)
-{
-    struct msg_cache_get_request request;
-    struct msg_cache_get_reply *reply;
-
-    request.type = MESSAGE_TYPE_CACHE_GET_REQUEST;
-    request.key = key;
-    mailbox_send_and_wait(&request);
-
-    reply = mailbox_wait_and_receive();
-    if(reply->type != MESSAGE_TYPE_CACHE_GET_REPLY) {
-        core_log("Malformed MESSAGE_TYPE_CACHE_GET_REQUEST reply type %d\n",
-                 reply->type);
-        while(1);
-    }
-
-    return (struct artiq_list) { reply->length, reply->elements };
-}
-
-void cache_put(const char *key, struct artiq_list value)
-{
-    struct msg_cache_put_request request;
-    struct msg_cache_put_reply *reply;
-
-    request.type = MESSAGE_TYPE_CACHE_PUT_REQUEST;
-    request.key = key;
-    request.elements = value.elements;
-    request.length = value.length;
-    mailbox_send_and_wait(&request);
-
-    reply = mailbox_wait_and_receive();
-    if(reply->type != MESSAGE_TYPE_CACHE_PUT_REPLY) {
-        core_log("Malformed MESSAGE_TYPE_CACHE_PUT_REQUEST reply type %d\n",
-                 reply->type);
-        while(1);
-    }
-
-    if(!reply->succeeded) {
-        artiq_raise_from_c("CacheError",
-            "cannot put into a busy cache row",
-            0, 0, 0);
-    }
-}
-
-void core_log(const char *fmt, ...)
-{
-    struct msg_log request;
-
-    request.type = MESSAGE_TYPE_LOG;
-    request.fmt = fmt;
-    va_start(request.args, fmt);
-    mailbox_send_and_wait(&request);
-    va_end(request.args);
-}

artiq/runtime/ksupport.h

@@ -1,17 +0,0 @@
-#ifndef __KSTARTUP_H
-#define __KSTARTUP_H
-
-struct artiq_list {
-    int32_t length;
-    int32_t *elements;
-};
-
-int watchdog_set(int ms);
-void watchdog_clear(int id);
-void send_rpc(int service, const char *tag, ...);
-int recv_rpc(void *slot);
-struct artiq_list cache_get(const char *key);
-void cache_put(const char *key, struct artiq_list value);
-void core_log(const char *fmt, ...);
-
-#endif /* __KSTARTUP_H */

artiq/runtime/ksupport.ld

@@ -1,20 +1,23 @@
 INCLUDE generated/output_format.ld
+STARTUP(crt0-or1k.o)
 ENTRY(_start)
 
 INCLUDE generated/regions.ld
 
-/* First 32M of main memory are reserved for runtime
+/* First 4M of main memory are reserved for runtime
  * code/data/heap, then comes kernel memory.
- * First 128K of kernel memory are for support code.
+ * Next 4M of main memory are reserved for
+ * the background RPC queue.
+ * First 256K of kernel memory are for support code.
+ * Support code is loaded at ORIGIN-0x80 so that ELF headers
+ * are also loaded.
  */
 MEMORY {
-    ksupport (RWX) : ORIGIN = 0x42000000, LENGTH = 0x20000
+    ksupport (RWX) : ORIGIN = 0x40800000, LENGTH = 0x40000
 }
 
-/* On AMP systems, kernel stack is at the end of main RAM,
- * before the runtime stack. Leave 1M for runtime stack.
- */
-PROVIDE(_fstack = 0x40000000 + LENGTH(main_ram) - 1024*1024 - 4);
+/* Kernel stack is at the end of main RAM. */
+PROVIDE(_fstack = ORIGIN(main_ram) + LENGTH(main_ram) - 4);
 
 /* Force ld to make the ELF header as loadable. */
 PHDRS
@@ -32,6 +35,16 @@ SECTIONS
         _etext = .;
     } :text
 
+    /* https://sourceware.org/bugzilla/show_bug.cgi?id=20475 */
+    .got : {
+        _GLOBAL_OFFSET_TABLE_ = .;
+        *(.got)
+    } :text
+
+    .got.plt : {
+        *(.got.plt)
+    } :text
+
     .rodata :
     {
         . = ALIGN(4);
@@ -43,12 +56,12 @@ SECTIONS
 
     .eh_frame :
     {
-        *(.eh_frame)
+        KEEP(*(.eh_frame))
     } :text
 
     .eh_frame_hdr :
     {
-        *(.eh_frame_hdr)
+        KEEP(*(.eh_frame_hdr))
     } :text :eh_frame
 
     .data :
@@ -73,7 +86,10 @@ SECTIONS
         *(COMMON)
         . = ALIGN(4);
         _ebss = .;
-        . = ALIGN(8);
-        _heapstart = .;
+    }
+
+    /DISCARD/ :
+    {
+        *(.debug*)
     }
 }

artiq/runtime/ksupport_glue.c

@@ -0,0 +1,121 @@
+#include <stdarg.h>
+#include <string.h>
+#include <stdio.h>
+#include <math.h>
+
+#include <link.h>
+#include <dlfcn.h>
+
+void send_to_log(const char *ptr, size_t length);
+
+#define KERNELCPU_EXEC_ADDRESS    0x40800000
+#define KERNELCPU_PAYLOAD_ADDRESS 0x40840000
+#define KERNELCPU_LAST_ADDRESS    0x4fffffff
+#define KSUPPORT_HEADER_SIZE      0x80
+
+/* called by libunwind */
+int fprintf(FILE *stream, const char *fmt, ...)
+{
+    size_t size;
+    char *buf;
+    va_list args;
+
+    va_start(args, fmt);
+    size = vsnprintf(NULL, 0, fmt, args);
+    buf = __builtin_alloca(size + 1);
+    va_end(args);
+
+    va_start(args, fmt);
+    vsnprintf(buf, size + 1, fmt, args);
+    va_end(args);
+
+    send_to_log(buf, size);
+    return 0;
+}
+
+/* called by libunwind */
+int dladdr (const void *address, Dl_info *info)
+{
+    /* we don't try to resolve names */
+    return 0;
+}
+
+/* called by libunwind */
+int dl_iterate_phdr (int (*callback)(struct dl_phdr_info *, size_t, void *), void *data)
+{
+    Elf32_Ehdr *ehdr;
+    struct dl_phdr_info phdr_info;
+    int retval;
+
+    ehdr = (Elf32_Ehdr *)(KERNELCPU_EXEC_ADDRESS - KSUPPORT_HEADER_SIZE);
+    phdr_info = (struct dl_phdr_info){
+        .dlpi_addr  = 0, /* absolutely linked */
+        .dlpi_name  = "<ksupport>",
+        .dlpi_phdr  = (Elf32_Phdr*) ((intptr_t)ehdr + ehdr->e_phoff),
+        .dlpi_phnum = ehdr->e_phnum,
+    };
+    retval = callback(&phdr_info, sizeof(phdr_info), data);
+    if(retval)
+        return retval;
+
+    ehdr = (Elf32_Ehdr *)KERNELCPU_PAYLOAD_ADDRESS;
+    phdr_info = (struct dl_phdr_info){
+        .dlpi_addr  = KERNELCPU_PAYLOAD_ADDRESS,
+        .dlpi_name  = "<kernel>",
+        .dlpi_phdr  = (Elf32_Phdr*) ((intptr_t)ehdr + ehdr->e_phoff),
+        .dlpi_phnum = ehdr->e_phnum,
+    };
+    retval = callback(&phdr_info, sizeof(phdr_info), data);
+    return retval;
+}
+
+/* called by kernel */
+double round(double x);
+double round(double x)
+{
+    union {double f; uint64_t i;} u = {x};
+    int e = u.i >> 52 & 0x7ff;
+    double y;
+
+    if (e >= 0x3ff+52)
+        return x;
+    if (u.i >> 63)
+        x = -x;
+    if (e < 0x3ff-1) {
+        /* we don't do it in ARTIQ */
+        /* raise inexact if x!=0 */
+        // FORCE_EVAL(x + 0x1p52);
+        return 0*u.f;
+    }
+    y = (double)(x + 0x1p52) - 0x1p52 - x;
+    if (y > 0.5)
+        y = y + x - 1;
+    else if (y <= -0.5)
+        y = y + x + 1;
+    else
+        y = y + x;
+    if (u.i >> 63)
+        y = -y;
+    return y;
+}
+
+/* called by kernel */
+int core_log(const char *fmt, ...);
+int core_log(const char *fmt, ...)
+{
+    size_t size;
+    char *buf;
+    va_list args;
+
+    va_start(args, fmt);
+    size = vsnprintf(NULL, 0, fmt, args);
+    buf = __builtin_alloca(size + 1);
+    va_end(args);
+
+    va_start(args, fmt);
+    vsnprintf(buf, size + 1, fmt, args);
+    va_end(args);
+
+    send_to_log(buf, size);
+    return 0;
+}

artiq/runtime/log.c

@@ -1,51 +0,0 @@
-#include <stdarg.h>
-#include <stdio.h>
-#include <string.h>
-#include <console.h>
-
-#include <generated/csr.h>
-
-#include "log.h"
-
-static int buffer_cursor;
-static char buffer[LOG_BUFFER_SIZE];
-
-void core_log(const char *fmt, ...)
-{
-    va_list args;
-
-    va_start(args, fmt);
-    core_log_va(fmt, args);
-    va_end(args);
-}
-
-void core_log_va(const char *fmt, va_list args)
-{
-    char outbuf[256];
-    int len = vscnprintf(outbuf, sizeof(outbuf), fmt, args);
-
-    for(int i = 0; i < len; i++) {
-        buffer[buffer_cursor] = outbuf[i];
-        buffer_cursor = (buffer_cursor + 1) % LOG_BUFFER_SIZE;
-    }
-
-#ifdef CSR_ETHMAC_BASE
-    /* Since main comms are over ethernet, the serial port
-     * is free for us to use. */
-    putsnonl(outbuf);
-#endif
-}
-
-void core_log_get(char *outbuf)
-{
-    int j = buffer_cursor;
-    for(int i = 0; i < LOG_BUFFER_SIZE; i++) {
-        outbuf[i] = buffer[j];
-        j = (j + 1) % LOG_BUFFER_SIZE;
-    }
-}
-
-void core_log_clear()
-{
-    memset(buffer, 0, sizeof(buffer));
-}

artiq/runtime/log.h

@@ -1,13 +0,0 @@
-#ifndef __LOG_H
-#define __LOG_H
-
-#include <stdarg.h>
-
-#define LOG_BUFFER_SIZE 4096
-
-void core_log(const char *fmt, ...);
-void core_log_va(const char *fmt, va_list args);
-void core_log_get(char *outbuf);
-void core_log_clear(void);
-
-#endif /* __LOG_H */