riscv-formal-nmigen/checks/rvfi_imem_check.py

89 lines
3.1 KiB
Python

from nmigen import *
from nmigen.hdl.ast import *
class rvfi_imem_check(Elaboratable):
def __init__(self, RISCV_FORMAL_ILEN=32, RISCV_FORMAL_XLEN=32):
self.RISCV_FORMAL_ILEN = RISCV_FORMAL_ILEN
self.RISCV_FORMAL_XLEN = RISCV_FORMAL_XLEN
self.reset = Signal(1)
self.enable = Signal(1)
self.imem_addr = Signal(self.RISCV_FORMAL_XLEN)
self.imem_data = Signal(16)
self.rvfi_valid = Signal(1)
self.rvfi_order = Signal(64)
self.rvfi_insn = Signal(self.RISCV_FORMAL_ILEN)
self.rvfi_trap = Signal(1)
self.rvfi_halt = Signal(1)
self.rvfi_intr = Signal(1)
self.rvfi_mode = Signal(2)
self.rvfi_ixl = Signal(2)
self.rvfi_rs1_addr = Signal(5)
self.rvfi_rs2_addr = Signal(5)
self.rvfi_rs1_rdata = Signal(self.RISCV_FORMAL_XLEN)
self.rvfi_rs2_rdata = Signal(self.RISCV_FORMAL_XLEN)
self.rvfi_rd_addr = Signal(5)
self.rvfi_rd_wdata = Signal(self.RISCV_FORMAL_XLEN)
self.rvfi_pc_rdata = Signal(self.RISCV_FORMAL_XLEN)
self.rvfi_pc_wdata = Signal(self.RISCV_FORMAL_XLEN)
self.rvfi_mem_addr = Signal(self.RISCV_FORMAL_XLEN)
self.rvfi_mem_rmask = Signal(int(self.RISCV_FORMAL_XLEN // 8))
self.rvfi_mem_wmask = Signal(int(self.RISCV_FORMAL_XLEN // 8))
self.rvfi_mem_rdata = Signal(self.RISCV_FORMAL_XLEN)
self.rvfi_mem_wdata = Signal(self.RISCV_FORMAL_XLEN)
def ports(self):
input_ports = [
self.reset,
self.enable,
self.rvfi_valid,
self.rvfi_order,
self.rvfi_insn,
self.rvfi_trap,
self.rvfi_halt,
self.rvfi_intr,
self.rvfi_mode,
self.rvfi_ixl,
self.rvfi_rs1_addr,
self.rvfi_rs2_addr,
self.rvfi_rs1_rdata,
self.rvfi_rs2_rdata,
self.rvfi_rd_addr,
self.rvfi_rd_wdata,
self.rvfi_pc_rdata,
self.rvfi_pc_wdata,
self.rvfi_mem_addr,
self.rvfi_mem_rmask,
self.rvfi_mem_wmask,
self.rvfi_mem_rdata,
self.rvfi_mem_wdata
]
output_ports = [
self.imem_addr,
self.imem_data
]
return input_ports + output_ports
def elaborate(self, platform):
m = Module()
imem_addr_randval = AnyConst(self.RISCV_FORMAL_XLEN)
imem_data_randval = AnyConst(16)
m.d.comb += self.imem_addr.eq(imem_addr_randval)
m.d.comb += self.imem_data.eq(imem_data_randval)
pc = Signal(self.RISCV_FORMAL_XLEN)
insn = Signal(self.RISCV_FORMAL_ILEN)
with m.If(self.reset):
pass
with m.Else():
with m.If(self.enable & self.rvfi_valid):
m.d.sync += pc.eq(self.rvfi_pc_rdata)
m.d.sync += insn.eq(self.rvfi_insn)
with m.If(pc == self.imem_addr):
m.d.comb += Assert(insn[:16] == self.imem_data)
with m.If((insn[:2] == 0b11) & (pc + 2 == self.imem_addr)):
m.d.comb += Assert(insn[16:32] == self.imem_data)
return m