From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Mon, 26 Nov 2018 04:50:26 +0000 (+0000)
Subject: start adding csrs
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=14730237a7819d4043be869606f75ba660389f09;p=rv32.git

start adding csrs
---

diff --git a/cpu.py b/cpu.py
index 9d50e59..3b7b802 100644
--- a/cpu.py
+++ b/cpu.py
@@ -461,44 +461,24 @@ class CPU(Module):
         csr_written_value = Signal()
         c = {}
 
+        # cycle
+        c[csr_cycle]  = csr_output_value.eq(minfo.cycle_counter[0:32])
+        c[csr_cycleh] = csr_output_value.eq(minfo.cycle_counter[32:64])
+        # time
+        c[csr_time]  = csr_output_value.eq(minfo.time_counter[0:32])
+        c[csr_timeh] = csr_output_value.eq(minfo.time_counter[32:64])
+        # instret
+        c[csr_instret]  = csr_output_value.eq(minfo.instret_counter[0:32])
+        c[csr_instreth] = csr_output_value.eq(minfo.instret_counter[32:64])
+        # mvendorid/march/mimpl/mhart
+        c[csr_mvendorid] = csr_output_value.eq(minfo.mvendorid)
+        c[csr_marchid  ] = csr_output_value.eq(minfo.marchid  )
+        c[csr_mimpid   ] = csr_output_value.eq(minfo.mimpid   )
+        c[csr_mhartid  ] = csr_output_value.eq(minfo.mhartid  )
+
         return Case(csr.number, c)
 
         """
-                reg [31:0] csr_output_value;
-                reg [31:0] csr_written_value;
-                csr_output_value = 32'hXXXXXXXX;
-                csr_written_value = 32'hXXXXXXXX;
-                case(csr_number)
-                `csr_cycle: begin
-                    csr_output_value = cycle_counter[31:0];
-                end
-                `csr_time: begin
-                    csr_output_value = time_counter[31:0];
-                end
-                `csr_instret: begin
-                    csr_output_value = instret_counter[31:0];
-                end
-                `csr_cycleh: begin
-                    csr_output_value = cycle_counter[63:32];
-                end
-                `csr_timeh: begin
-                    csr_output_value = time_counter[63:32];
-                end
-                `csr_instreth: begin
-                    csr_output_value = instret_counter[63:32];
-                end
-                `csr_mvendorid: begin
-                    csr_output_value = mvendorid;
-                end
-                `csr_marchid: begin
-                    csr_output_value = marchid;
-                end
-                `csr_mimpid: begin
-                    csr_output_value = mimpid;
-                end
-                `csr_mhartid: begin
-                    csr_output_value = mhartid;
-                end
                 `csr_misa: begin
                     csr_output_value = misa;
                 end