Merge branch 'master' into phaser

* master:
  runtime: replace a (deliberate) memory leak with an interner.
  compiler: disable remarks.
  runtime: rewrite i2c support code in Rust.
  runtime: rewrite rtio support code in Rust.

artiq/compiler/module.py

@@ -40,7 +40,7 @@ class Source:
             return cls(source.Buffer(f.read(), filename, 1), engine=engine)
 
 class Module:
-    def __init__(self, src, ref_period=1e-6, attribute_writeback=True, remarks=True):
+    def __init__(self, src, ref_period=1e-6, attribute_writeback=True, remarks=False):
         self.attribute_writeback = attribute_writeback
         self.engine = src.engine
         self.embedding_map = src.embedding_map

artiq/coredevice/rtio.py

@@ -3,8 +3,7 @@ from artiq.language.types import TInt64, TInt32, TNone
 
 
 @syscall(flags={"nowrite"})
-def rtio_output(time_mu: TInt64, channel: TInt32, addr: TInt32, data: TInt32
-                ) -> TNone:
+def rtio_output(time_mu: TInt64, channel: TInt32, addr: TInt32, data: TInt32) -> TNone:
     raise NotImplementedError("syscall not simulated")
 
 

artiq/runtime.rs/libksupport/api.rs

@@ -98,18 +98,18 @@ static mut API: &'static [(&'static str, *const ())] = &[
     api!(cache_put = ::cache_put),
 
     /* direct syscalls */
-    api!(rtio_init),
-    api!(rtio_get_counter),
+    api!(rtio_init = ::rtio::init),
+    api!(rtio_get_counter = ::rtio::get_counter),
     api!(rtio_log),
-    api!(rtio_output),
-    api!(rtio_input_timestamp),
-    api!(rtio_input_data),
+    api!(rtio_output = ::rtio::output),
+    api!(rtio_input_timestamp = ::rtio::input_timestamp),
+    api!(rtio_input_data = ::rtio::input_data),
 
-    api!(i2c_init),
-    api!(i2c_start),
-    api!(i2c_stop),
-    api!(i2c_write),
-    api!(i2c_read),
+    api!(i2c_init = ::i2c::init),
+    api!(i2c_start = ::i2c::start),
+    api!(i2c_stop = ::i2c::stop),
+    api!(i2c_write = ::i2c::write),
+    api!(i2c_read = ::i2c::read),
 
 // #if (defined CONFIG_AD9154_CS)
     api!(ad9154_init),

artiq/runtime.rs/libksupport/i2c.rs

@@ -0,0 +1,166 @@
+use board::csr;
+
+fn half_period() {
+    unsafe {
+        csr::timer_kernel::en_write(0);
+        csr::timer_kernel::load_write(csr::CONFIG_CLOCK_FREQUENCY/10000);
+        csr::timer_kernel::reload_write(0);
+        csr::timer_kernel::en_write(1);
+
+        csr::timer_kernel::update_value_write(1);
+        while csr::timer_kernel::value_read() != 0 {
+            csr::timer_kernel::update_value_write(1)
+        }
+    }
+}
+
+#[cfg(has_i2c)]
+mod imp {
+    use board::csr;
+
+    fn sda_bit(busno: u32) -> u32 { 1 << (2 * busno + 1) }
+    fn scl_bit(busno: u32) -> u32 { 1 << (2 * busno) }
+
+    pub fn sda_i(busno: u32) -> bool {
+        unsafe {
+            if busno >= csr::CONFIG_I2C_BUS_COUNT {
+                true
+            } else {
+                csr::i2c::in_read() & sda_bit(busno) != 0
+            }
+        }
+    }
+
+    pub fn sda_oe(busno: u32, oe: bool) {
+        unsafe {
+            let reg = csr::i2c::oe_read();
+            let reg = if oe { reg | sda_bit(busno) } else { reg & !sda_bit(busno) };
+            csr::i2c::oe_write(reg);
+        }
+    }
+
+    pub fn sda_o(busno: u32, o: bool) {
+        unsafe {
+            let reg = csr::i2c::out_read();
+            let reg = if o  { reg | sda_bit(busno) } else { reg & !sda_bit(busno) };
+            csr::i2c::out_write(reg)
+        }
+    }
+
+    pub fn scl_oe(busno: u32, oe: bool) {
+        unsafe {
+            let reg = csr::i2c::oe_read();
+            let reg = if oe { reg | scl_bit(busno) } else { reg & !scl_bit(busno) };
+            csr::i2c::oe_write(reg)
+        }
+    }
+
+    pub fn scl_o(busno: u32, o: bool) {
+        unsafe {
+            let reg = csr::i2c::out_read();
+            let reg = if o  { reg | scl_bit(busno) } else { reg & !scl_bit(busno) };
+            csr::i2c::out_write(reg)
+        }
+    }
+}
+
+// #[cfg(not(has_i2c))]
+// mod imp {
+//     pub fn sda_i(busno: u32) -> bool { true }
+//     pub fn sda_oe(busno: u32, oe: bool) {}
+//     pub fn sda_o(busno: u32, o: bool) {}
+//     pub fn scl_oe(busno: u32, oe: bool) {}
+//     pub fn scl_o(busno: u32, o: bool) {}
+// }
+
+use self::imp::*;
+
+pub extern fn init(busno: u32) {
+    // Set SCL as output, and high level
+    scl_o(busno, true);
+    scl_oe(busno, true);
+    // Prepare a zero level on SDA so that sda_oe pulls it down
+    sda_o(busno, false);
+    // Release SDA
+    sda_oe(busno, false);
+
+    // Check the I2C bus is ready
+    half_period();
+    half_period();
+    if !sda_i(busno) {
+        artiq_raise!("I2CError", "SDA is stuck low")
+    }
+}
+
+pub extern fn start(busno: u32) {
+    // Set SCL high then SDA low
+    scl_o(busno, true);
+    half_period();
+    sda_oe(busno, true);
+    half_period();
+}
+
+pub extern fn stop(busno: u32) {
+    // First, make sure SCL is low, so that the target releases the SDA line
+    scl_o(busno, false);
+    half_period();
+    // Set SCL high then SDA high
+    sda_oe(busno, true);
+    scl_o(busno, true);
+    half_period();
+    sda_oe(busno, false);
+    half_period();
+}
+
+pub extern fn write(busno: u32, data: u8) -> bool {
+    // MSB first
+    for bit in (0..8).rev() {
+        // Set SCL low and set our bit on SDA
+        scl_o(busno, false);
+        sda_oe(busno, data & (1 << bit) == 0);
+        half_period();
+        // Set SCL high ; data is shifted on the rising edge of SCL
+        scl_o(busno, true);
+        half_period();
+    }
+    // Check ack
+    // Set SCL low, then release SDA so that the I2C target can respond
+    scl_o(busno, false);
+    half_period();
+    sda_oe(busno, false);
+    // Set SCL high and check for ack
+    scl_o(busno, true);
+    half_period();
+    // returns true if acked (I2C target pulled SDA low)
+    !sda_i(busno)
+}
+
+pub extern fn read(busno: u32, ack: bool) -> u8 {
+    // Set SCL low first, otherwise setting SDA as input may cause a transition
+    // on SDA with SCL high which will be interpreted as START/STOP condition.
+    scl_o(busno, false);
+    half_period(); // make sure SCL has settled low
+    sda_oe(busno, false);
+
+    let mut data: u8 = 0;
+
+    // MSB first
+    for bit in (0..8).rev() {
+        scl_o(busno, false);
+        half_period();
+        // Set SCL high and shift data
+        scl_o(busno, true);
+        half_period();
+        if sda_i(busno) { data |= 1 << bit }
+    }
+    // Send ack
+    // Set SCL low and pull SDA low when acking
+    scl_o(busno, false);
+    if ack { sda_oe(busno, true) }
+    half_period();
+    // then set SCL high
+    scl_o(busno, true);
+    half_period();
+
+    data
+}

artiq/runtime.rs/libksupport/lib.rs

@@ -23,6 +23,35 @@ mod rpc_proto;
 mod dyld;
 mod api;
 
+#[allow(improper_ctypes)]
+extern {
+    fn __artiq_raise(exn: *const ::kernel_proto::Exception) -> !;
+}
+
+macro_rules! artiq_raise {
+    ($name:expr, $message:expr, $param0:expr, $param1:expr, $param2:expr) => ({
+        let exn = $crate::kernel_proto::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:    [$param0, $param1, $param2],
+            phantom:  ::core::marker::PhantomData
+        };
+        #[allow(unused_unsafe)]
+        unsafe { $crate::__artiq_raise(&exn as *const _) }
+    });
+    ($name:expr, $message:expr) => ({
+        artiq_raise!($name, $message, 0, 0, 0)
+    });
+}
+
+mod rtio;
+mod i2c;
+
 use core::{mem, ptr, slice, str};
 use std::io::Cursor;
 use libc::{c_char, size_t};
@@ -91,12 +120,17 @@ extern fn panic_fmt(args: core::fmt::Arguments, file: &'static str, line: u32) -
 static mut NOW: u64 = 0;
 
 #[no_mangle]
-pub extern fn send_to_log(ptr: *const u8, len: usize) {
+pub extern fn send_to_core_log(ptr: *const u8, len: usize) {
     send(&LogSlice(unsafe {
         str::from_utf8_unchecked(slice::from_raw_parts(ptr, len))
     }))
 }
 
+#[no_mangle]
+pub extern fn send_to_rtio_log(timestamp: i64, ptr: *const u8, len: usize) {
+    rtio::log(timestamp, unsafe { slice::from_raw_parts(ptr, len) })
+}
+
 extern fn abort() -> ! {
     println!("kernel called abort()");
     send(&RunAborted);
@@ -151,28 +185,6 @@ extern fn recv_rpc(slot: *mut ()) -> usize {
     })
 }
 
-#[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,

artiq/runtime.rs/libksupport/rtio.rs

@@ -0,0 +1,148 @@
+use board::csr;
+
+const RTIO_O_STATUS_FULL:           u32 = 1;
+const RTIO_O_STATUS_UNDERFLOW:      u32 = 2;
+const RTIO_O_STATUS_SEQUENCE_ERROR: u32 = 4;
+const RTIO_O_STATUS_COLLISION:      u32 = 8;
+const RTIO_O_STATUS_BUSY:           u32 = 16;
+const RTIO_I_STATUS_EMPTY:          u32 = 1;
+const RTIO_I_STATUS_OVERFLOW:       u32 = 2;
+
+pub extern fn init() {
+    unsafe {
+        csr::rtio::reset_write(1);
+        csr::rtio::reset_write(0);
+        csr::rtio::reset_phy_write(0);
+    }
+}
+
+pub extern fn get_counter() -> i64 {
+    unsafe {
+        csr::rtio::counter_update_write(1);
+        csr::rtio::counter_read() as i64
+    }
+}
+
+#[inline(never)]
+unsafe fn process_exceptional_status(timestamp: i64, channel: u32, status: u32) {
+    if status & RTIO_O_STATUS_FULL != 0 {
+        while csr::rtio::o_status_read() & RTIO_O_STATUS_FULL != 0 {}
+    }
+    if status & RTIO_O_STATUS_UNDERFLOW != 0 {
+        csr::rtio::o_underflow_reset_write(1);
+        artiq_raise!("RTIOUnderflow",
+            "RTIO underflow at {0} mu, channel {1}, slack {2} mu",
+            timestamp, channel as i64, timestamp - get_counter())
+    }
+    if status & RTIO_O_STATUS_SEQUENCE_ERROR != 0 {
+        csr::rtio::o_sequence_error_reset_write(1);
+        artiq_raise!("RTIOSequenceError",
+            "RTIO sequence error at {0} mu, channel {1}",
+            timestamp, channel as i64, 0)
+    }
+    if status & RTIO_O_STATUS_COLLISION != 0 {
+        csr::rtio::o_collision_reset_write(1);
+        artiq_raise!("RTIOCollision",
+            "RTIO collision at {0} mu, channel {1}",
+            timestamp, channel as i64, 0)
+    }
+    if status & RTIO_O_STATUS_BUSY != 0 {
+        csr::rtio::o_busy_reset_write(1);
+        artiq_raise!("RTIOBusy",
+            "RTIO busy on channel {0}",
+            channel as i64, 0, 0)
+    }
+}
+
+pub extern fn output(timestamp: i64, channel: u32, addr: u32, data: u32) {
+    unsafe {
+        csr::rtio::chan_sel_write(channel);
+        csr::rtio::o_timestamp_write(timestamp as u64);
+        csr::rtio::o_address_write(addr);
+        csr::rtio::o_data_write(data);
+        csr::rtio::o_we_write(1);
+        let status = csr::rtio::o_status_read();
+        if status != 0 {
+            process_exceptional_status(timestamp, channel, status);
+        }
+    }
+}
+
+pub extern fn input_timestamp(timeout: i64, channel: u32) -> u64 {
+    unsafe {
+        csr::rtio::chan_sel_write(channel);
+        let mut status;
+        loop {
+            status = csr::rtio::i_status_read();
+            if status == 0 { break }
+
+            if status & RTIO_I_STATUS_OVERFLOW != 0 {
+                csr::rtio::i_overflow_reset_write(1);
+                break
+            }
+            if get_counter() >= timeout {
+                // check empty flag again to prevent race condition.
+                // now we are sure that the time limit has been exceeded.
+                let status = csr::rtio::i_status_read();
+                if status & RTIO_I_STATUS_EMPTY != 0 { break }
+            }
+            // input FIFO is empty - keep waiting
+        }
+
+        if status & RTIO_I_STATUS_OVERFLOW != 0 {
+            artiq_raise!("RTIOOverflow",
+                "RTIO input overflow on channel {0}",
+                channel as i64, 0, 0);
+        }
+        if status & RTIO_I_STATUS_EMPTY != 0 {
+            return !0
+        }
+
+        let timestamp = csr::rtio::i_timestamp_read();
+        csr::rtio::i_re_write(1);
+        timestamp
+    }
+}
+
+pub extern fn input_data(channel: u32) -> u32 {
+    unsafe {
+        csr::rtio::chan_sel_write(channel);
+        loop {
+            let status = csr::rtio::i_status_read();
+            if status == 0 { break }
+
+            if status & RTIO_I_STATUS_OVERFLOW != 0 {
+                csr::rtio::i_overflow_reset_write(1);
+                artiq_raise!("RTIOOverflow",
+                    "RTIO input overflow on channel {0}",
+                    channel as i64, 0, 0);
+            }
+        }
+
+        let data = csr::rtio::i_data_read();
+        csr::rtio::i_re_write(1);
+        data
+    }
+}
+
+pub fn log(timestamp: i64, data: &[u8]) {
+    unsafe {
+        csr::rtio::chan_sel_write(csr::CONFIG_RTIO_LOG_CHANNEL);
+        csr::rtio::o_timestamp_write(timestamp as u64);
+
+        let mut word: u32 = 0;
+        for i in 0..data.len() {
+            word <<= 8;
+            word |= data[i] as u32;
+            if i % 4 == 0 {
+                csr::rtio::o_data_write(word);
+                csr::rtio::o_we_write(1);
+                word = 0;
+            }
+        }
+
+        word <<= 8;
+        csr::rtio::o_data_write(word);
+        csr::rtio::o_we_write(1);
+    }
+}

artiq/runtime.rs/src/kernel_proto.rs

@@ -17,7 +17,7 @@ pub struct Exception<'a> {
     pub column:   u32,
     pub function: *const u8,
     pub message:  *const u8,
-    pub param:    [u64; 3],
+    pub param:    [i64; 3],
     pub phantom:  PhantomData<&'a str>
 }
 

artiq/runtime.rs/src/session.rs

@@ -2,6 +2,7 @@ use std::prelude::v1::*;
 use std::{mem, str};
 use std::cell::RefCell;
 use std::io::{self, Read, Write, BufWriter};
+use std::btree_set::BTreeSet;
 use {config, rtio_crg, clock, mailbox, rpc_queue, kernel};
 use logger::BufferLogger;
 use cache::Cache;
@@ -57,7 +58,8 @@ struct Session<'a> {
     congress: &'a mut Congress,
     kernel_state: KernelState,
     watchdog_set: clock::WatchdogSet,
-    log_buffer: String
+    log_buffer: String,
+    interner: BTreeSet<String>
 }
 
 impl<'a> Session<'a> {
@@ -66,7 +68,8 @@ impl<'a> Session<'a> {
             congress: congress,
             kernel_state: KernelState::Absent,
             watchdog_set: clock::WatchdogSet::new(),
-            log_buffer: String::new()
+            log_buffer: String::new(),
+            interner: BTreeSet::new()
         }
     }
 
@@ -309,20 +312,20 @@ fn process_host_message(waiter: Waiter,
             }));
 
             // FIXME: gross.
-            fn into_c_str(s: String) -> *const u8 {
+            fn into_c_str(interner: &mut BTreeSet<String>, s: String) -> *const u8 {
                 let s = s + "\0";
-                let p = s.as_bytes().as_ptr();
-                mem::forget(s);
+                interner.insert(s.clone());
+                let p = interner.get(&s).unwrap().as_bytes().as_ptr();
                 p
             }
             let exn = kern::Exception {
-                name: into_c_str(name),
-                message: into_c_str(message),
+                name: into_c_str(&mut session.interner, name),
+                message: into_c_str(&mut session.interner, message),
                 param: param,
-                file: into_c_str(file),
+                file: into_c_str(&mut session.interner, file),
                 line: line,
                 column: column,
-                function: into_c_str(function),
+                function: into_c_str(&mut session.interner, function),
                 phantom: ::core::marker::PhantomData
             };
             try!(kern_send(waiter, &kern::RpcRecvReply(Err(exn))));

artiq/runtime.rs/src/session_proto.rs

@@ -30,7 +30,7 @@ pub enum Request {
     RpcException {
         name:     String,
         message:  String,
-        param:    [u64; 3],
+        param:    [i64; 3],
         file:     String,
         line:     u32,
         column:   u32,
@@ -59,9 +59,9 @@ impl Request {
             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))],
+                param:    [try!(read_u64(reader).map(|x| x as i64)),
+                           try!(read_u64(reader).map(|x| x as i64)),
+                           try!(read_u64(reader).map(|x| x as i64))],
                 file:     try!(read_string(reader)),
                 line:     try!(read_u32(reader)),
                 column:   try!(read_u32(reader)),
@@ -99,7 +99,7 @@ pub enum Reply<'a> {
     KernelException {
         name:      &'a str,
         message:   &'a str,
-        param:     [u64; 3],
+        param:     [i64; 3],
         file:      &'a str,
         line:      u32,
         column:    u32,
@@ -157,9 +157,9 @@ impl<'a> Reply<'a> {
                 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_u64(writer, param[0] as u64));
+                try!(write_u64(writer, param[1] as u64));
+                try!(write_u64(writer, param[2] as u64));
                 try!(write_string(writer, file));
                 try!(write_u32(writer, line));
                 try!(write_u32(writer, column));

artiq/runtime/Makefile

@@ -4,7 +4,7 @@ include $(MISOC_DIRECTORY)/software/common.mak
 PYTHON ?= python3.5
 
 OBJECTS := flash_storage.o main.o
-OBJECTS_KSUPPORT := ksupport_glue.o artiq_personality.o rtio.o i2c.o ad9154.o
+OBJECTS_KSUPPORT := ksupport_glue.o artiq_personality.o ad9154.o
 
 RUSTOUT_DIRECTORY := cargo/or1k-unknown-none/debug
 CORE_IO_COMMIT := d40c593f42fafbac1ff3d827f6df96338b5b7d8b

artiq/runtime/i2c.c

@@ -1,192 +0,0 @@
-#include <generated/csr.h>
-
-#include "artiq_personality.h"
-#include "i2c.h"
-
-
-static void i2c_halfperiod()
-{
-    timer_kernel_en_write(0);
-    timer_kernel_load_write(CONFIG_CLOCK_FREQUENCY/10000);
-    timer_kernel_reload_write(0);
-    timer_kernel_en_write(1);
-
-    timer_kernel_update_value_write(1);
-    while(timer_kernel_value_read() != 0)
-        timer_kernel_update_value_write(1);
-}
-
-#if (defined CONFIG_I2C_BUS_COUNT) && (CONFIG_I2C_BUS_COUNT > 0)
-
-#define SDA_BIT (1 << (2*busno + 1))
-#define SCL_BIT (1 << (2*busno))
-
-static int i2c_sda_i(int busno)
-{
-    if(busno >= CONFIG_I2C_BUS_COUNT)
-        return 1;
-    else
-        return i2c_in_read() & SDA_BIT;
-}
-
-static void i2c_sda_oe(int busno, int oe)
-{
-    int reg;
-
-    reg = i2c_oe_read();
-    if(oe)
-        reg |= SDA_BIT;
-    else
-        reg &= ~SDA_BIT;
-    i2c_oe_write(reg);
-}
-
-static void i2c_sda_o(int busno, int o)
-{
-    int reg;
-
-    reg = i2c_out_read();
-    if(o)
-        reg |= SDA_BIT;
-    else
-        reg &= ~SDA_BIT;
-    i2c_out_write(reg);
-}
-
-static void i2c_scl_oe(int busno, int oe)
-{
-    int reg;
-
-    reg = i2c_oe_read();
-    if(oe)
-        reg |= SCL_BIT;
-    else
-        reg &= ~SCL_BIT;
-    i2c_oe_write(reg);
-}
-
-static void i2c_scl_o(int busno, int o)
-{
-    int reg;
-
-    reg = i2c_out_read();
-    if(o)
-        reg |= SCL_BIT;
-    else
-        reg &= ~SCL_BIT;
-    i2c_out_write(reg);
-}
-
-#else
-
-static int i2c_sda_i(int busno)
-{
-    return 1;
-}
-static void i2c_sda_oe(int busno, int oe) {}
-static void i2c_sda_o(int busno, int o) {}
-static void i2c_scl_oe(int busno, int oe) {}
-static void i2c_scl_o(int busno, int o) {}
-
-#endif
-
-
-void i2c_init(int busno)
-{
-    /* Set SCL as output, and high level */
-    i2c_scl_o(busno, 1);
-    i2c_scl_oe(busno, 1);
-    /* Prepare a zero level on SDA so that i2c_sda_oe pulls it down */
-    i2c_sda_o(busno, 0);
-    /* Release SDA */
-    i2c_sda_oe(busno, 0);
-
-    /* Check the I2C bus is ready */
-    i2c_halfperiod();
-    i2c_halfperiod();
-    if(!i2c_sda_i(busno))
-        artiq_raise_from_c("I2CError", "SDA is stuck low", 0, 0, 0);
-}
-
-void i2c_start(int busno)
-{
-    /* Set SCL high then SDA low */
-    i2c_scl_o(busno, 1);
-    i2c_halfperiod();
-    i2c_sda_oe(busno, 1);
-    i2c_halfperiod();
-}
-
-void i2c_stop(int busno)
-{
-    /* First, make sure SCL is low, so that the target releases the SDA line */
-    i2c_scl_o(busno, 0);
-    i2c_halfperiod();
-    /* Set SCL high then SDA high */
-    i2c_sda_oe(busno, 1);
-    i2c_scl_o(busno, 1);
-    i2c_halfperiod();
-    i2c_sda_oe(busno, 0);
-    i2c_halfperiod();
-}
-
-int i2c_write(int busno, int b)
-{
-    int i;
-
-    /* MSB first */
-    for(i=7;i>=0;i--) {
-        /* Set SCL low and set our bit on SDA */
-        i2c_scl_o(busno, 0);
-        i2c_sda_oe(busno, b & (1 << i) ? 0 : 1);
-        i2c_halfperiod();
-        /* Set SCL high ; data is shifted on the rising edge of SCL */
-        i2c_scl_o(busno, 1);
-        i2c_halfperiod();
-    }
-    /* Check ack */
-    /* Set SCL low, then release SDA so that the I2C target can respond */
-    i2c_scl_o(busno, 0);
-    i2c_halfperiod();
-    i2c_sda_oe(busno, 0);
-    /* Set SCL high and check for ack */
-    i2c_scl_o(busno, 1);
-    i2c_halfperiod();
-    /* returns 1 if acked (I2C target pulled SDA low) */
-    return !i2c_sda_i(busno);
-}
-
-int i2c_read(int busno, int ack)
-{
-    int i;
-    unsigned char b;
-
-    /* Set SCL low first, otherwise setting SDA as input may cause a transition
-     * on SDA with SCL high which will be interpreted as START/STOP condition.
-     */
-    i2c_scl_o(busno, 0);
-    i2c_halfperiod(); /* make sure SCL has settled low */
-    i2c_sda_oe(busno, 0);
-
-    b = 0;
-    /* MSB first */
-    for(i=7;i>=0;i--) {
-        i2c_scl_o(busno, 0);
-        i2c_halfperiod();
-        /* Set SCL high and shift data */
-        i2c_scl_o(busno, 1);
-        i2c_halfperiod();
-        if(i2c_sda_i(busno)) b |= (1 << i);
-    }
-    /* Send ack */
-    /* Set SCL low and pull SDA low when acking */
-    i2c_scl_o(busno, 0);
-    if(ack)
-        i2c_sda_oe(busno, 1);
-    i2c_halfperiod();
-    /* then set SCL high */
-    i2c_scl_o(busno, 1);
-    i2c_halfperiod();
-
-    return b;
-}

artiq/runtime/i2c.h

@@ -1,10 +0,0 @@
-#ifndef __I2C_H
-#define __I2C_H
-
-void i2c_init(int busno);
-void i2c_start(int busno);
-void i2c_stop(int busno);
-int i2c_write(int busno, int b);
-int i2c_read(int busno, int ack);
-
-#endif

artiq/runtime/ksupport_glue.c

@@ -6,7 +6,8 @@
 #include <link.h>
 #include <dlfcn.h>
 
-void send_to_log(const char *ptr, size_t length);
+void send_to_core_log(const char *ptr, size_t length);
+void send_to_rtio_log(long long int timestamp, const char *ptr, size_t length);
 
 #define KERNELCPU_EXEC_ADDRESS    0x40800000
 #define KERNELCPU_PAYLOAD_ADDRESS 0x40840000
@@ -16,20 +17,18 @@ void send_to_log(const char *ptr, size_t length);
 /* 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);
+    size_t size = vsnprintf(NULL, 0, fmt, args);
+    char *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);
+    send_to_core_log(buf, size);
     return 0;
 }
 
@@ -103,19 +102,35 @@ double round(double x)
 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);
+    size_t size = vsnprintf(NULL, 0, fmt, args);
+    char *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);
+    send_to_core_log(buf, size);
     return 0;
 }
+
+/* called by kernel */
+void rtio_log(long long int timestamp, const char *fmt, ...);
+void rtio_log(long long int timestamp, const char *fmt, ...)
+{
+    va_list args;
+
+    va_start(args, fmt);
+    size_t size = vsnprintf(NULL, 0, fmt, args);
+    char *buf = __builtin_alloca(size + 1);
+    va_end(args);
+
+    va_start(args, fmt);
+    vsnprintf(buf, size + 1, fmt, args);
+    va_end(args);
+
+    send_to_rtio_log(timestamp, buf, size);
+}

artiq/runtime/rtio.c

@@ -1,166 +0,0 @@
-#include <generated/csr.h>
-
-#include "artiq_personality.h"
-#include "rtio.h"
-
-void rtio_init(void)
-{
-    rtio_reset_write(1);
-    rtio_reset_write(0);
-    rtio_reset_phy_write(0);
-}
-
-long long int rtio_get_counter(void)
-{
-    rtio_counter_update_write(1);
-    return rtio_counter_read();
-}
-
-static void rtio_process_exceptional_status(
-        long long int timestamp, int channel, int status)
-{
-    if(status & RTIO_O_STATUS_FULL)
-        while(rtio_o_status_read() & RTIO_O_STATUS_FULL);
-    if(status & RTIO_O_STATUS_UNDERFLOW) {
-        rtio_o_underflow_reset_write(1);
-        artiq_raise_from_c("RTIOUnderflow",
-            "RTIO underflow at {0} mu, channel {1}, slack {2} mu",
-            timestamp, channel, timestamp - rtio_get_counter());
-    }
-    if(status & RTIO_O_STATUS_SEQUENCE_ERROR) {
-        rtio_o_sequence_error_reset_write(1);
-        artiq_raise_from_c("RTIOSequenceError",
-            "RTIO sequence error at {0} mu, channel {1}",
-            timestamp, channel, 0);
-    }
-    if(status & RTIO_O_STATUS_COLLISION) {
-        rtio_o_collision_reset_write(1);
-        artiq_raise_from_c("RTIOCollision",
-            "RTIO collision at {0} mu, channel {1}",
-            timestamp, channel, 0);
-    }
-    if(status & RTIO_O_STATUS_BUSY) {
-        rtio_o_busy_reset_write(1);
-        artiq_raise_from_c("RTIOBusy",
-            "RTIO busy on channel {0}",
-            channel, 0, 0);
-    }
-}
-
-
-void rtio_output(long long int timestamp, int channel, unsigned int addr,
-        unsigned int data)
-{
-    int status;
-
-    rtio_chan_sel_write(channel);
-    rtio_o_timestamp_write(timestamp);
-#ifdef CSR_RTIO_O_ADDRESS_ADDR
-    rtio_o_address_write(addr);
-#endif
-    rtio_o_data_write(data);
-    rtio_o_we_write(1);
-    status = rtio_o_status_read();
-    if(status)
-        rtio_process_exceptional_status(timestamp, channel, status);
-}
-
-
-long long int rtio_input_timestamp(long long int timeout, int channel)
-{
-    long long int r;
-    int status;
-
-    rtio_chan_sel_write(channel);
-    while((status = rtio_i_status_read())) {
-        if(status & RTIO_I_STATUS_OVERFLOW) {
-            rtio_i_overflow_reset_write(1);
-            break;
-        }
-        if(rtio_get_counter() >= timeout) {
-            /* check empty flag again to prevent race condition.
-             * now we are sure that the time limit has been exceeded.
-             */
-            status = rtio_i_status_read();
-            if(status & RTIO_I_STATUS_EMPTY)
-                break;
-        }
-        /* input FIFO is empty - keep waiting */
-    }
-
-    if (status & RTIO_I_STATUS_OVERFLOW)
-        artiq_raise_from_c("RTIOOverflow",
-                "RTIO input overflow on channel {0}",
-                channel, 0, 0);
-    if (status & RTIO_I_STATUS_EMPTY)
-        return -1;
-
-    r = rtio_i_timestamp_read();
-    rtio_i_re_write(1);
-    return r;
-}
-
-
-unsigned int rtio_input_data(int channel)
-{
-    unsigned int data;
-    int status;
-
-    rtio_chan_sel_write(channel);
-    while((status = rtio_i_status_read())) {
-        if(status & RTIO_I_STATUS_OVERFLOW) {
-            rtio_i_overflow_reset_write(1);
-            artiq_raise_from_c("RTIOOverflow",
-                    "RTIO input overflow on channel {0}",
-                    channel, 0, 0);
-        }
-    }
-
-    data = rtio_i_data_read();
-    rtio_i_re_write(1);
-    return data;
-}
-
-
-void rtio_log_va(long long int timestamp, const char *fmt, va_list args)
-{
-#ifdef CONFIG_RTIO_LOG_CHANNEL
-    // This executes on the kernel CPU's stack, which is specifically designed
-    // for allocation of this kind of massive buffers.
-    int   len = vsnprintf(NULL, 0, fmt, args);
-    char *buf = __builtin_alloca(len + 1);
-    vsnprintf(buf, len + 1, fmt, args);
-
-    rtio_chan_sel_write(CONFIG_RTIO_LOG_CHANNEL);
-    rtio_o_timestamp_write(timestamp);
-
-    int i = 0;
-    unsigned int word = 0;
-    while(1) {
-        word <<= 8;
-        word |= *buf & 0xff;
-        if(*buf == 0) {
-            rtio_o_data_write(word);
-            rtio_o_we_write(1);
-            break;
-        }
-        buf++;
-        i++;
-        if(i == 4) {
-            rtio_o_data_write(word);
-            rtio_o_we_write(1);
-            word = 0;
-            i = 0;
-        }
-    }
-#endif
-}
-
-void rtio_log(long long int timestamp, const char *fmt, ...)
-{
-    va_list args;
-
-    va_start(args, fmt);
-    rtio_log_va(timestamp, fmt, args);
-    va_end(args);
-}

artiq/runtime/rtio.h

@@ -1,33 +0,0 @@
-#ifndef __RTIO_H
-#define __RTIO_H
-
-#include <stdarg.h>
-
-#define RTIO_O_STATUS_FULL 1
-#define RTIO_O_STATUS_UNDERFLOW 2
-#define RTIO_O_STATUS_SEQUENCE_ERROR 4
-#define RTIO_O_STATUS_COLLISION 8
-#define RTIO_O_STATUS_BUSY 16
-#define RTIO_I_STATUS_EMPTY 1
-#define RTIO_I_STATUS_OVERFLOW 2
-
-void rtio_init(void);
-long long int rtio_get_counter(void);
-void rtio_log(long long int timestamp, const char *format, ...);
-void rtio_log_va(long long int timestamp, const char *format, va_list args);
-void rtio_output(long long int timestamp, int channel, unsigned int address,
-        unsigned int data);
-
-/*
- * Waits at least until timeout and returns the timestamp of the first
- * input event on the chanel, -1 if there was no event.
- */
-long long int rtio_input_timestamp(long long int timeout, int channel);
-
-/*
- * Assumes that there is or will be an event in the channel and returns only
- * its data.
- */
-unsigned int rtio_input_data(int channel);
-
-#endif /* __RTIO_H */