38 lines
1.3 KiB
Python
38 lines
1.3 KiB
Python
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from insn import *
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class rvfi_insn_R(rvfi_insn):
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def __init__(self):
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super(rvfi_insn_R, self).__init__()
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self.insn_padding = Signal(32)
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self.insn_funct7 = Signal(7)
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self.insn_rs2 = Signal(5)
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self.insn_rs1 = Signal(5)
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self.insn_funct3 = Signal(3)
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self.insn_rd = Signal(5)
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self.insn_opcode = Signal(7)
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self.misa_ok = Signal(1)
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def ports(self):
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return super(rvfi_insn_R, self).ports()
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def elaborate(self, platform):
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m = super(rvfi_insn_R, self).elaborate(platform)
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# R-type instruction format
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m.d.comb += self.insn_padding.eq(self.rvfi_insn >> 32)
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m.d.comb += self.insn_funct7.eq(self.rvfi_insn[25:32])
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m.d.comb += self.insn_rs2.eq(self.rvfi_insn[20:25])
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m.d.comb += self.insn_rs1.eq(self.rvfi_insn[15:20])
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m.d.comb += self.insn_funct3.eq(self.rvfi_insn[12:15])
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m.d.comb += self.insn_rd.eq(self.rvfi_insn[7:12])
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m.d.comb += self.insn_opcode.eq(self.rvfi_insn[:7])
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m.d.comb += self.misa_ok.eq(1)
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# default assignments
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m.d.comb += self.spec_trap.eq(~self.misa_ok)
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m.d.comb += self.spec_mem_addr.eq(0)
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m.d.comb += self.spec_mem_rmask.eq(0)
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m.d.comb += self.spec_mem_wmask.eq(0)
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m.d.comb += self.spec_mem_wdata.eq(0)
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return m
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