DCache: I/O rename
[firearm.git] / Execute.v
index 71f12e9..4420a75 100644 (file)
--- a/Execute.v
+++ b/Execute.v
@@ -3,7 +3,7 @@ module Execute(
        input Nrst,     /* XXX not used yet */
        
        input stall_2a,
-       input flush,
+       input flush_2a,
        
        input bubble_2a,
        input [31:0] pc_2a,
@@ -17,9 +17,9 @@ module Execute(
        
        output reg outstall_2a = 0,
        output reg bubble_3a = 1,
-       output reg [31:0] outcpsr = 0,
-       output reg [31:0] outspsr = 0,
-       output reg outcpsrup = 0,
+       output reg [31:0] cpsr_3a = 0,
+       output reg [31:0] spsr_3a = 0,
+       output reg cpsrup_3a = 0,
        output reg write_reg_3a = 1'bx,
        output reg [3:0] write_num_3a = 4'bxxxx,
        output reg [31:0] write_data_3a = 32'hxxxxxxxx,
@@ -42,8 +42,8 @@ module Execute(
        wire alu_setres_2a;
        
        reg next_bubble_3a;
-       reg [31:0] next_outcpsr, next_outspsr;
-       reg next_outcpsrup;
+       reg [31:0] next_cpsr_3a, next_spsr_3a;
+       reg next_cpsrup_3a;
        
        reg next_write_reg_3a;
        reg [3:0] next_write_num_3a;
@@ -65,9 +65,9 @@ module Execute(
                if (!stall_2a)
                begin
                        bubble_3a <= next_bubble_3a;
-                       outcpsr <= next_outcpsr;
-                       outspsr <= next_outspsr;
-                       outcpsrup <= next_outcpsrup;
+                       cpsr_3a <= next_cpsr_3a;
+                       spsr_3a <= next_spsr_3a;
+                       cpsrup_3a <= next_cpsrup_3a;
                        write_reg_3a <= next_write_reg_3a;
                        write_num_3a <= next_write_num_3a;
                        write_data_3a <= next_write_data_3a;
@@ -79,12 +79,12 @@ module Execute(
                end
        end
        
-       reg delayedflush = 0;
+       reg delayedflush_2a = 0;
        always @(posedge clk)
-               if (flush && outstall_2a /* halp! I can't do it now, maybe later? */)
-                       delayedflush <= 1;
+               if (flush_2a && outstall_2a /* halp! I can't do it now, maybe later? */)
+                       delayedflush_2a <= 1;
                else if (!outstall_2a /* anything has been handled this time around */)
-                       delayedflush <= 0;
+                       delayedflush_2a <= 0;
 
        reg outstall_3a = 0;
        always @(posedge clk)
@@ -112,9 +112,9 @@ module Execute(
        /* Register outputs */
        always @(*)
        begin
-               next_outcpsr = cpsr_2a;
-               next_outspsr = spsr_2a;
-               next_outcpsrup = 0;
+               next_cpsr_3a = cpsr_2a;
+               next_spsr_3a = spsr_2a;
+               next_cpsrup_3a = 0;
                next_write_reg_3a = 0;
                next_write_num_3a = 4'hx;
                next_write_data_3a = 32'hxxxxxxxx;
@@ -122,8 +122,8 @@ module Execute(
                casez(insn_2a)
                `DECODE_ALU_MULT:       /* Multiply -- must come before ALU, because it pattern matches a specific case of ALU */
                begin
-                       next_outcpsr = insn_2a[20] /* S */ ? {mult_result[31] /* N */, mult_result == 0 /* Z */, 1'b0 /* C */, cpsr_2a[28] /* V */, cpsr_2a[27:0]} : cpsr_2a;
-                       next_outcpsrup = insn_2a[20] /* S */;
+                       next_cpsr_3a = insn_2a[20] /* S */ ? {mult_result[31] /* N */, mult_result == 0 /* Z */, 1'b0 /* C */, cpsr_2a[28] /* V */, cpsr_2a[27:0]} : cpsr_2a;
+                       next_cpsrup_3a = insn_2a[20] /* S */;
                        next_write_reg_3a = 1;
                        next_write_num_3a = insn_2a[19:16] /* Rd -- why the fuck isn't this the same place as ALU */;
                        next_write_data_3a = mult_result;
@@ -143,16 +143,16 @@ module Execute(
                        if ((cpsr_2a[4:0] == `MODE_USR) || (insn_2a[16] /* that random bit */ == 1'b0)) /* flags only */
                        begin
                                if (insn_2a[22] /* Ps */)
-                                       next_outspsr = {op0_2a[31:29], spsr_2a[28:0]};
+                                       next_spsr_3a = {op0_2a[31:29], spsr_2a[28:0]};
                                else
-                                       next_outcpsr = {op0_2a[31:29], cpsr_2a[28:0]};
+                                       next_cpsr_3a = {op0_2a[31:29], cpsr_2a[28:0]};
                        end else begin
                                if (insn_2a[22] /* Ps */)
-                                       next_outspsr = op0_2a;
+                                       next_spsr_3a = op0_2a;
                                else
-                                       next_outcpsr = op0_2a;
+                                       next_cpsr_3a = op0_2a;
                        end
-                       next_outcpsrup = 1;
+                       next_cpsrup_3a = 1;
                end
                `DECODE_ALU_SWP,        /* Atomic swap */
                `DECODE_ALU_BX,         /* Branch */
@@ -168,8 +168,8 @@ module Execute(
                        end
                        
                        if (insn_2a[20] /* S */) begin
-                               next_outcpsrup = 1;
-                               next_outcpsr = ((insn_2a[15:12] == 4'b1111) && insn_2a[20]) ? spsr_2a : alu_outcpsr_2a;
+                               next_cpsrup_3a = 1;
+                               next_cpsr_3a = ((insn_2a[15:12] == 4'b1111) && insn_2a[20]) ? spsr_2a : alu_outcpsr_2a;
                        end
                end
                `DECODE_LDRSTR_UNDEFINED,       /* Undefined. I hate ARM */
@@ -213,7 +213,7 @@ module Execute(
        /* Miscellaneous cleanup. */
        always @(*)
        begin
-               next_bubble_3a = bubble_2a | flush | delayedflush;
+               next_bubble_3a = bubble_2a | flush_2a | delayedflush_2a;
 
                jmp_2a = 1'b0;
                jmppc_2a = 32'h00000000;
@@ -235,7 +235,7 @@ module Execute(
                begin end
                `DECODE_BRANCH:
                begin
-                       if(!bubble_2a && !flush && !delayedflush && !outstall_2a /* Let someone else take precedence. */) begin
+                       if(!bubble_2a && !flush_2a && !delayedflush_2a && !outstall_2a /* Let someone else take precedence. */) begin
                                jmppc_2a = pc_2a + op0_2a + 32'h8;
                                jmp_2a = 1'b1;
                        end
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