Implement coprocessor instruction decode

1 files changed, 24 insertions, 0 deletions

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