memory: add some stuff in ldm/stm
authorChristopher Lu <lu@stop.hsd1.pa.comcast.net>
Tue, 6 Jan 2009 07:27:04 +0000 (02:27 -0500)
committerChristopher Lu <lu@stop.hsd1.pa.comcast.net>
Tue, 6 Jan 2009 07:27:04 +0000 (02:27 -0500)
Memory.v

index 409b282..3eb39b3 100644 (file)
--- a/Memory.v
+++ b/Memory.v
@@ -5,8 +5,8 @@ module Memory(
        input Nrst,
        input [31:0] pc,
        input [31:0] insn,
-       input [31:0] base,
-       input [31:0] offset,
+       input [31:0] op0,
+       input [31:0] op1,
 
        /* bus interface */
        output reg [31:0] busaddr,
@@ -37,6 +37,7 @@ module Memory(
        reg [3:0] next_regsel;
        reg next_writeback, next_notdone, next_inc_next;
        reg [31:0] align_s1, align_s2, align_rddata;
+       reg [15:0] regs, next_regs;
 
        reg notdone = 1'b0;
        reg inc_next = 1'b0;
@@ -58,8 +59,8 @@ module Memory(
                casez(insn)
                `DECODE_LDRSTR_UNDEFINED: begin end
                `DECODE_LDRSTR: begin
-                       addr = insn[23] ? base + offset : base - offset; /* up/down select */
-                       raddr = insn[24] ? base : addr;
+                       addr = insn[23] ? op0 + op1 : op0 - op1; /* up/down select */
+                       raddr = insn[24] ? op0 : addr;
                        busaddr = {raddr[31:2], 2'b0}; /* pre/post increment */
                        rd_req = insn[20];
                        wr_req = ~insn[20];
@@ -88,6 +89,47 @@ module Memory(
                        next_notdone = rw_wait & insn[20] & insn[21];
                end
                `DECODE_LDMSTM: begin
+                       busaddr = {op0[31:2], 2'b0};
+                       rd_req = insn[20];
+                       wr_req = ~insn[20];
+                       casez(regs)
+                       16'b???????????????1: begin
+                               next_regs = regs;
+                       end
+                       16'b??????????????10: begin
+                       end
+                       16'b?????????????100: begin
+                       end
+                       16'b????????????1000: begin
+                       end
+                       16'b???????????10000: begin
+                       end
+                       16'b??????????100000: begin
+                       end
+                       16'b?????????1000000: begin
+                       end
+                       16'b????????10000000: begin
+                       end
+                       16'b???????100000000: begin
+                       end
+                       16'b??????1000000000: begin
+                       end
+                       16'b?????10000000000: begin
+                       end
+                       16'b????100000000000: begin
+                       end
+                       16'b???1000000000000: begin
+                       end
+                       16'b??10000000000000: begin
+                       end
+                       16'b?100000000000000: begin
+                       end
+                       16'b1000000000000000: begin
+                       end
+                       default: begin
+                               next_inc_next = 1'b1;
+                       end
+                       endcase
                end
                default: begin end
                endcase
@@ -103,6 +145,7 @@ module Memory(
                regdata <= next_regdata;
                notdone <= next_notdone;
                inc_next <= next_inc_next;
+               regs <= next_regs;
        end
 
 endmodule
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