Add RV32I U-Type Instruction Format

This commit is contained in:
Donald Sebastian Leung 2020-08-11 17:25:57 +08:00
parent 32526017d0
commit 371fcc81c1
1 changed files with 26 additions and 0 deletions

26
insns/InsnRV32IUType.py Normal file
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from Insn import *
"""
RV32I U-Type Instruction
"""
class InsnRV32IUType(Insn):
def __init__(self, RISCV_FORMAL_ILEN, RISCV_FORMAL_XLEN, RISCV_FORMAL_CSR_MISA, RISCV_FORMAL_COMPRESSED, opcode):
super().__init__(RISCV_FORMAL_ILEN, RISCV_FORMAL_XLEN, RISCV_FORMAL_CSR_MISA, RISCV_FORMAL_COMPRESSED)
self.opcode = opcode
def elaborate(self, platform):
m = super().elaborate(platform)
m.d.comb += self.insn_imm.eq(Value.as_signed(self.rvfi_insn[12:32] << 12))
if self.RISCV_FORMAL_CSR_MISA:
m.d.comb += self.misa_ok.eq((self.rvfi_csr_misa_rdata & 0) == 0)
m.d.comb += self.spec_csr_misa_rmask.eq(0)
else:
m.d.comb += self.misa_ok.eq(1)
m.d.comb += self.spec_valid.eq(self.rvfi_valid & (~self.insn_padding) & (self.insn_opcode == self.opcode))
m.d.comb += self.spec_rd_addr.eq(self.insn_rd)
m.d.comb += self.spec_pc_wdata.eq(self.rvfi_pc_rdata + 4)
return m