118 lines
3.4 KiB
Python
118 lines
3.4 KiB
Python
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from functools import reduce
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from operator import or_
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from nmigen import *
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from nmigen.hdl.rec import *
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from ..csr import *
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from ..isa import *
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__all__ = ["TriggerUnit"]
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class Type:
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NOP = 0
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LEGACY = 1
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MATCH = 2
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INSN_COUNT = 3
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INTERRUPT = 4
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EXCEPTION = 5
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mcontrol_layout = [
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("load", 1),
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("store", 1),
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("execute", 1),
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("u", 1),
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("s", 1),
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("zero0", 1),
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("m", 1),
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("match", 4),
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("chain", 1),
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("action", 4),
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("size", 2),
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("timing", 1),
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("select", 1),
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("hit", 1),
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("maskmax", 6)
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]
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class TriggerUnit(Elaboratable, AutoCSR):
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def __init__(self, nb_triggers):
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if not isinstance(nb_triggers, int):
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raise TypeError("Number of triggers must be an int, not {!r}"
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.format(nb_triggers))
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if nb_triggers == 0 or nb_triggers & nb_triggers - 1:
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raise ValueError("Number of triggers must be a power of 2, not {!r}"
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.format(nb_triggers))
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self.nb_triggers = nb_triggers
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self.tselect = CSR(0x7a0, flat_layout)
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self.tdata1 = CSR(0x7a1, tdata1_layout)
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self.tdata2 = CSR(0x7a2, flat_layout)
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self.x_pc = Signal(32)
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self.x_valid = Signal()
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self.haltreq = Signal()
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self.x_trap = Signal()
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def elaborate(self, platform):
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m = Module()
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triggers = [Record.like(self.tdata1.r) for _ in range(self.nb_triggers)]
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for t in triggers:
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# We only support address/data match triggers.
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m.d.comb += t.type.eq(Type.MATCH)
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def do_trigger_update(trigger):
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m.d.sync += trigger.dmode.eq(self.tdata1.w.dmode)
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mcontrol = Record([("i", mcontrol_layout), ("o", mcontrol_layout)])
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m.d.comb += [
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mcontrol.i.eq(self.tdata1.w.data),
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mcontrol.o.execute.eq(mcontrol.i.execute),
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mcontrol.o.m.eq(mcontrol.i.m),
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mcontrol.o.action.eq(mcontrol.i.action),
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]
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m.d.sync += trigger.data.eq(mcontrol.o)
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with m.Switch(self.tselect.r.value):
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for i, t in enumerate(triggers):
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with m.Case(i):
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m.d.comb += self.tdata1.r.eq(t)
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with m.If(self.tdata1.we):
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do_trigger_update(t)
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with m.If(self.tselect.we):
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with m.If(self.tselect.w.value & (self.nb_triggers - 1)):
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m.d.sync += self.tselect.r.value.eq(self.tselect.w.value)
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with m.If(self.tdata2.we):
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m.d.sync += self.tdata2.r.eq(self.tdata2.w)
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hit = Signal()
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halt = Signal()
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with m.Switch(self.tdata1.r.type):
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with m.Case(Type.MATCH):
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mcontrol = Record(mcontrol_layout)
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m.d.comb += mcontrol.eq(self.tdata1.r.data)
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match = Signal()
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with m.If(mcontrol.execute):
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m.d.comb += match.eq(self.tdata2.r == self.x_pc & self.x_valid)
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m.d.comb += [
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hit.eq(match & mcontrol.m),
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halt.eq(mcontrol.action)
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]
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with m.If(hit):
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with m.If(halt):
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m.d.comb += self.haltreq.eq(self.tdata1.r.dmode)
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with m.Else():
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m.d.comb += self.x_trap.eq(1)
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return m
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