From 735c804c8e8e4bdcbe27c2e8ff74d609d7f45846 Mon Sep 17 00:00:00 2001 From: Alejandro Soto Date: Tue, 1 Nov 2022 21:00:50 -0600 Subject: Implement coprocessor instruction decode --- rtl/core/decode/coproc.sv | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 rtl/core/decode/coproc.sv (limited to 'rtl/core/decode/coproc.sv') diff --git a/rtl/core/decode/coproc.sv b/rtl/core/decode/coproc.sv new file mode 100644 index 0000000..153cadf --- /dev/null +++ b/rtl/core/decode/coproc.sv @@ -0,0 +1,24 @@ +`include "core/decode/isa.sv" +`include "core/uarch.sv" + +module core_decode_coproc +( + input word insn, + + output coproc_decode decode, + output reg_num rd, + output logic writeback, + update_flags +); + + assign rd = insn `FIELD_CP_RD; + assign writeback = decode.load && rd != `R15; + assign update_flags = decode.load && rd == `R15; + + assign decode.crn = insn `FIELD_CP_CRN; + assign decode.crm = insn `FIELD_CP_CRM; + assign decode.op1 = insn `FIELD_CP_OPCODE; + assign decode.op2 = insn `FIELD_CP_OPCODE2; + assign decode.load = insn `FIELD_CP_LOAD; + +endmodule -- cgit v1.2.3