From e7fb589a21ee26ad897e03cbd0d7a647d9cd97e5 Mon Sep 17 00:00:00 2001
From: Joshua Wise <joshua@rebirth.joshuawise.com>
Date: Sat, 3 May 2008 01:21:08 -0400
Subject: [PATCH 1/1] Add some verilator and isim compatibility

---
 GBZ80Core.v | 25 ++++++++++++++++++-------
 System.v    | 33 ++++++++++++++++++++++++++++++---
 Uart.v      |  6 +++---
 mashrom.c   |  3 ++-
 4 files changed, 53 insertions(+), 14 deletions(-)

diff --git a/GBZ80Core.v b/GBZ80Core.v
index 05c449a..1182b32 100644
--- a/GBZ80Core.v
+++ b/GBZ80Core.v
@@ -130,8 +130,19 @@
 `define EXEC_NEXTADDR_PCINC	address <= `_PC + 1;
 `define EXEC_NEWCYCLE		begin newcycle <= 1; rd <= 1; wr <= 0; end
 `define EXEC_NEWCYCLE_TWOBYTE	begin newcycle <= 1; rd <= 1; wr <= 0; twobyte <= 1; end
-`define EXEC_WRITE(ad, da)	begin address <= (ad); wdata <= (da); wr <= 1; end end
-`define EXEC_READ(ad)		begin address <= (ad); rd <= 1; end end
+`ifdef verilator
+	`define EXEC_WRITE(ad, da)	begin address <= (ad); wdata <= (da); wr <= 1; end
+	`define EXEC_READ(ad)		begin address <= (ad); rd <= 1; end
+`else
+	`ifdef isim
+		`define EXEC_WRITE(ad, da)	begin address <= (ad); wdata <= (da); wr <= 1; end
+		`define EXEC_READ(ad)		begin address <= (ad); rd <= 1; end
+	`else
+/* Work around XST's retarded bugs :\ */
+		`define EXEC_WRITE(ad, da)	begin address <= (ad); wdata <= (da); wr <= 1; end end
+		`define EXEC_READ(ad)		begin address <= (ad); rd <= 1; end end
+	`endif
+`endif
 
 module GBZ80Core(
 	input clk,
@@ -185,7 +196,7 @@ module GBZ80Core(
 			2'b0,
 			tmp[0]};
 
-	assign sla   = {tmp[6:0],0};
+	assign sla   = {tmp[6:0],1'b0};
 	assign slaf  = {(tmp[6:0] == 0 ? 1'b1 : 1'b0),
 			2'b0,
 			tmp[7]};
@@ -194,10 +205,10 @@ module GBZ80Core(
 //	assign sraf  = {(tmp[7:1] == 0 ? 1'b1 : 1'b0),2'b0,tmp[0]};   now in assign srlf =
 
 	assign swap  = {tmp[3:0],tmp[7:4]};
-	assign swapf = {(tmp == 0 ? 1'b1 : 1'b0),
+	assign swapf = {(tmp == 1'b0 ? 1'b1 : 1'b0),
 			3'b0};
 
-	assign srl   = {0,tmp[7:1]};
+	assign srl   = {1'b0,tmp[7:1]};
 	assign srlf  = {(tmp[7:1] == 0 ? 1'b1 : 1'b0),
 			2'b0,
 			tmp[0]};
@@ -267,12 +278,12 @@ module GBZ80Core(
 		`STATE_DECODE: begin
 			if (newcycle) begin
 				if (twobyte) begin
-					opcode <= {1,busdata};
+					opcode <= {1'b1,busdata};
 					twobyte <= 0;
 				end else if (ie && irq)
 					opcode <= `INSN_VOP_INTR;
 				else
-					opcode <= {0,busdata};
+					opcode <= {1'b0,busdata};
 				rdata <= busdata;
 				newcycle <= 0;
 				cycle <= 0;
diff --git a/System.v b/System.v
index dc70cc0..cdcee09 100644
--- a/System.v
+++ b/System.v
@@ -83,7 +83,16 @@ module Switches(
 	end
 endmodule
 
+`ifdef isim
+module Dumpable(input [2:0] r, g, input [1:0] b, input hs, vs, vgaclk);
+endmodule
+`endif
+
 module CoreTop(
+`ifdef isim
+	output reg vgaclk = 0,
+	output reg clk = 0,
+`else
 	input xtal,
 	input [7:0] switches,
 	input [3:0] buttons,
@@ -91,16 +100,31 @@ module CoreTop(
 	output serio,
 	output wire [3:0] digits,
 	output wire [7:0] seven,
+`endif
 	output wire hs, vs,
 	output wire [2:0] r, g,
 	output wire [1:0] b,
 	output wire soundl, soundr);
+
+`ifdef isim
+	always #62 clk <= ~clk;
+	always #100 vgaclk <= ~vgaclk;
+	
+	Dumpable dump(r,g,b,hs,vs,vgaclk);
 	
+	wire [7:0] leds;
+	wire serio;
+	wire [3:0] digits;
+	wire [7:0] seven;
+	wire [7:0] switches = 8'b0;
+	wire [3:0] buttons = 4'b0;
+`else	
 	wire xtalb, clk, vgaclk;
 	IBUFG iclkbuf(.O(xtalb), .I(xtal));
 	CPUDCM dcm (.CLKIN_IN(xtalb), .CLKFX_OUT(clk));
 	pixDCM pixdcm (.CLKIN_IN(xtalb), .CLKFX_OUT(vgaclk));
-	
+`endif
+
 	wire [15:0] addr;	
 	wire [7:0] data;
 	wire wr, rd;
@@ -224,8 +248,8 @@ module CoreTop(
 		.vblank(vblankirq),
 		.lcdc(lcdcirq),
 		.tovf(tmrirq),
-		.serial(0),
-		.buttons(0),
+		.serial(1'b0),
+		.buttons(1'b0),
 		.master(irq),
 		.jaddr(jaddr));
 	
@@ -239,6 +263,8 @@ module CoreTop(
 		.snd_data_r(soundr));
 endmodule
 
+`ifdef verilator
+`else
 module TestBench();
 	reg clk = 1;
 	wire [15:0] addr;
@@ -315,3 +341,4 @@ module TestBench();
 		.switches(switches),
 		.ledout(leds));
 endmodule
+`endif
diff --git a/Uart.v b/Uart.v
index af173ca..1f0ae7d 100644
--- a/Uart.v
+++ b/Uart.v
@@ -21,14 +21,14 @@ module UART(
 	reg have_data = 0;
 	reg [3:0] diqing = 4'b0000;
 	
-	wire new = (wr) && (!have_data) && decode;
+	wire newdata = (wr) && (!have_data) && decode;
 	
 	assign odata = have_data ? 8'b1 : 8'b0;
 
 	always @ (negedge clk)
 	begin
 		/* deal with diqing */
-		if(new) begin
+		if(newdata) begin
 			data_stor <= data;
 			have_data <= 1;
 			diqing <= 4'b0000;
@@ -52,7 +52,7 @@ module UART(
 		end
 
 		/* deal with clkdiv */
-		if((new && !have_data) || clkdiv == `CLK_DIV)
+		if((newdata && !have_data) || clkdiv == `CLK_DIV)
 			clkdiv <= 0;
 		else
 			clkdiv <= clkdiv + 1;
diff --git a/mashrom.c b/mashrom.c
index 5c252fe..6ab07a4 100644
--- a/mashrom.c
+++ b/mashrom.c
@@ -1,4 +1,4 @@
-void main(int argc, char** argv)
+int main(int argc, char** argv)
 {
   int n = 1024;
   int i;
@@ -11,4 +11,5 @@ void main(int argc, char** argv)
       c = 0;
     printf("%02x\n", c);
   }
+  return 0;
 }
\ No newline at end of file
-- 
2.43.0