Add liveness check

This commit is contained in:
Donald Sebastian Leung 2020-08-21 12:54:53 +08:00
parent 63fbc10b11
commit a7b6b7a169
2 changed files with 70 additions and 0 deletions

View File

@ -0,0 +1,46 @@
from nmigen import *
from nmigen.asserts import *
"""
Liveness Check
"""
class LivenessCheck(Elaboratable):
def __init__(self):
self.reset = Signal(1)
self.rvfi_order = Signal(64)
self.trig = Signal(1)
self.rvfi_valid = Signal(1)
self.rvfi_halt = Signal(1)
self.check = Signal(1)
def ports(self):
input_ports = [
self.reset,
self.rvfi_order,
self.trig,
self.rvfi_valid,
self.rvfi_halt,
self.check
]
return input_ports
def elaborate(self, platform):
m = Module()
insn_order = AnyConst(64)
found_next_insn = Signal(1, reset=0)
with m.If(self.reset):
m.d.sync += found_next_insn.eq(0)
with m.Else():
with m.If(self.rvfi_valid & (self.rvfi_order == insn_order + 1)):
m.d.sync += found_next_insn.eq(1)
with m.If(self.trig):
m.d.comb += Assume(self.rvfi_valid)
m.d.comb += Assume(~self.rvfi_halt)
m.d.comb += Assume(insn_order == self.rvfi_order)
with m.If(self.check):
m.d.comb += Assert(found_next_insn)
return m

View File

@ -4,6 +4,7 @@ from ...checks.pc_fwd_check import *
from ...checks.pc_bwd_check import *
from ...checks.reg_check import *
from ...checks.causal_check import *
from ...checks.liveness_check import *
from minerva.core import *
from ...insns.insn_lui import *
from ...insns.insn_auipc import *
@ -220,6 +221,26 @@ class CausalTestCase(FHDLTestCase):
def verify(self):
self.assertFormal(CausalSpec(), mode="bmc", depth=12, engine="smtbmc --nopresat")
class LivenessSpec(Elaboratable):
def elaborate(self, platform):
m = Module()
m.submodules.cpu = cpu = Minerva(with_rvfi=True)
m.submodules.liveness_spec = liveness_spec = LivenessCheck()
m.d.comb += liveness_spec.reset.eq(0)
m.d.comb += liveness_spec.rvfi_valid.eq(cpu.rvfi.valid)
m.d.comb += liveness_spec.rvfi_order.eq(cpu.rvfi.order)
m.d.comb += liveness_spec.trig.eq(1)
m.d.comb += liveness_spec.rvfi_halt.eq(cpu.rvfi.halt)
m.d.comb += liveness_spec.check.eq(1)
return m
class LivenessTestCase(FHDLTestCase):
def verify(self):
self.assertFormal(LivenessSpec(), mode="bmc", depth=12, engine="smtbmc --nopresat")
print('*' * 80)
print('*' + ' ' * 78 + '*')
print('* Verifying the Minerva core ... *')
@ -241,6 +262,9 @@ RegTestCase().verify()
print("Verifying causal checks ...")
CausalTestCase().verify()
print("Verifying liveness checks ...")
LivenessTestCase().verify()
print('*' * 80)
print('*' + ' ' * 78 + '*')
print('* All verification tasks successful! *')