-`define BUS_ICACHE 0
-`define BUS_DCACHE 1
+`define BUS_ICACHE 1
+`define BUS_DCACHE 0
module System(input clk);
wire [7:0] bus_req;
wire bus_req_icache;
wire bus_req_dcache;
- assign bus_req = {6'b0, bus_req_dcache, bus_req_icache};
+ assign bus_req = {6'b0, bus_req_icache, bus_req_dcache};
wire bus_ack_icache = bus_ack[`BUS_ICACHE];
wire bus_ack_dcache = bus_ack[`BUS_DCACHE];
wire dcache_rw_wait;
wire [31:0] dcache_wr_data, dcache_rd_data;
- wire [31:0] decode_out_op0, decode_out_op1, decode_out_op2, decode_out_spsr;
+ wire [31:0] decode_out_op0, decode_out_op1, decode_out_op2, decode_out_spsr, decode_out_cpsr;
wire decode_out_carry;
wire [3:0] regfile_read_0, regfile_read_1, regfile_read_2, regfile_read_3;
wire [31:0] regfile_rdata_0, regfile_rdata_1, regfile_rdata_2, regfile_rdata_3, regfile_spsr;
+ wire regfile_write;
+ wire [3:0] regfile_write_reg;
+ wire [31:0] regfile_write_data;
wire execute_out_write_reg;
wire [3:0] execute_out_write_num;
wire [31:0] execute_out_write_data;
wire [31:0] execute_out_op0, execute_out_op1, execute_out_op2;
wire [31:0] execute_out_cpsr, execute_out_spsr;
- wire [31:0] jmppc;
- wire jmp;
+
+ wire jmp_out_execute, jmp_out_writeback;
+ wire [31:0] jmppc_out_execute, jmppc_out_writeback;
+ wire jmp = jmp_out_execute | jmp_out_writeback;
+ wire [31:0] jmppc = jmppc_out_execute | jmppc_out_writeback;
wire memory_out_write_reg;
wire [3:0] memory_out_write_num;
wire [31:0] memory_out_write_data;
+ wire [31:0] memory_out_cpsr, memory_out_spsr;
+
+ wire [31:0] writeback_out_cpsr, writeback_out_spsr;
wire cp_ack_terminal;
wire cp_busy_terminal;
wire [31:0] pc_out_memory;
wire execute_out_backflush;
+ wire writeback_out_backflush;
BusArbiter busarbiter(.bus_req(bus_req), .bus_ack(bus_ack));
Issue issue(
.clk(clk),
.Nrst(1'b1 /* XXX */),
- .stall(stall_cause_execute), .flush(execute_out_backflush),
+ .stall(stall_cause_execute), .flush(execute_out_backflush | writeback_out_backflush),
.inbubble(bubble_out_fetch), .insn(insn_out_fetch),
- .inpc(pc_out_fetch), .cpsr(32'b0 /* XXX */),
+ .inpc(pc_out_fetch), .cpsr(writeback_out_cpsr),
.outstall(stall_cause_issue), .outbubble(bubble_out_issue),
.outpc(pc_out_issue), .outinsn(insn_out_issue));
RegFile regfile(
.clk(clk),
- .read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2), .read_2(regfile_read_3),
- .rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2), .rdata_2(regfile_rdata_3),
- .spsr(regfile_spsr), .write(4'b0), .write_req(1'b0), .write_data(10 /* XXX */));
+ .read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2), .read_3(regfile_read_3),
+ .rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2), .rdata_3(regfile_rdata_3),
+ .spsr(regfile_spsr),
+ .write(regfile_write), .write_reg(regfile_write_reg), .write_data(regfile_write_data));
Decode decode(
.clk(clk),
- .insn(insn_out_fetch), .inpc(pc_out_fetch), .incpsr(32'b0 /* XXX */), .inspsr(regfile_spsr),
+ .stall(stall_cause_execute),
+ .insn(insn_out_fetch), .inpc(pc_out_fetch), .incpsr(writeback_out_cpsr), .inspsr(writeback_out_spsr),
.op0(decode_out_op0), .op1(decode_out_op1), .op2(decode_out_op2),
- .carry(decode_out_carry), .outspsr(decode_out_spsr),
+ .carry(decode_out_carry), .outcpsr(decode_out_cpsr), .outspsr(decode_out_spsr),
.read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2),
.rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2));
Execute execute(
.clk(clk), .Nrst(1'b0),
- .stall(stall_cause_memory), .flush(1'b0),
+ .stall(stall_cause_memory), .flush(writeback_out_backflush),
.inbubble(bubble_out_issue), .pc(pc_out_issue), .insn(insn_out_issue),
- .cpsr(32'b0 /* XXX */), .spsr(decode_out_spsr), .op0(decode_out_op0), .op1(decode_out_op1),
+ .cpsr(decode_out_cpsr), .spsr(decode_out_spsr), .op0(decode_out_op0), .op1(decode_out_op1),
.op2(decode_out_op2), .carry(decode_out_carry),
.outstall(stall_cause_execute), .outbubble(bubble_out_execute),
.write_reg(execute_out_write_reg), .write_num(execute_out_write_num),
.write_data(execute_out_write_data),
- .jmp(jmp), .jmppc(jmppc),
+ .jmp(jmp_out_execute), .jmppc(jmppc_out_execute),
.outpc(pc_out_execute), .outinsn(insn_out_execute),
.outop0(execute_out_op0), .outop1(execute_out_op1), .outop2(execute_out_op2),
.outcpsr(execute_out_cpsr), .outspsr(execute_out_spsr));
assign cp_insn = insn_out_execute;
Memory memory(
.clk(clk), .Nrst(1'b0),
- /* stall? flush? */
+ /* stall? */ .flush(writeback_out_backflush),
.busaddr(dcache_addr), .rd_req(dcache_rd_req), .wr_req(dcache_wr_req),
.rw_wait(dcache_rw_wait), .wr_data(dcache_wr_data), .rd_data(dcache_rd_data),
.st_read(regfile_read_3), .st_data(regfile_rdata_3),
.outpc(pc_out_memory), .outinsn(insn_out_memory),
.out_write_reg(memory_out_write_reg), .out_write_num(memory_out_write_num),
.out_write_data(memory_out_write_data),
- .cp_req(cp_req), .cp_ack(cp_ack), .cp_busy(cp_busy), .cp_rnw(cp_rnw), .cp_read(cp_read), .cp_write(cp_write));
+ .cp_req(cp_req), .cp_ack(cp_ack), .cp_busy(cp_busy), .cp_rnw(cp_rnw), .cp_read(cp_read), .cp_write(cp_write),
+ .outcpsr(memory_out_cpsr), .outspsr(memory_out_spsr) /* XXX data_size */);
Terminal terminal(
.clk(clk),
.cp_req(cp_req), .cp_insn(cp_insn), .cp_ack(cp_ack_terminal), .cp_busy(cp_busy_terminal), .cp_rnw(cp_rnw),
.cp_read(cp_read_terminal), .cp_write(cp_write));
+
+ Writeback writeback(
+ .clk(clk),
+ .inbubble(bubble_out_memory),
+ .write_reg(memory_out_write_reg), .write_num(memory_out_write_num), .write_data(memory_out_write_data),
+ .cpsr(memory_out_cpsr), .spsr(memory_out_spsr),
+ .regfile_write(regfile_write), .regfile_write_reg(regfile_write_reg), .regfile_write_data(regfile_write_data),
+ .outcpsr(writeback_out_cpsr), .outspsr(writeback_out_spsr),
+ .jmp(jmp_out_writeback), .jmppc(jmppc_out_writeback));
+ assign writeback_out_backflush = jmp_out_writeback;
reg [31:0] clockno = 0;
always @(posedge clk)
$display("------------------------------------------------------------------------------");
$display("%3d: FETCH: Bubble: %d, Instruction: %08x, PC: %08x", clockno, bubble_out_fetch, insn_out_fetch, pc_out_fetch);
$display("%3d: ISSUE: Stall: %d, Bubble: %d, Instruction: %08x, PC: %08x", clockno, stall_cause_issue, bubble_out_issue, insn_out_issue, pc_out_issue);
- $display("%3d: DECODE: op1 %08x, op2 %08x, op3 %08x, carry %d", clockno, decode_out_op0, decode_out_op1, decode_out_op2, decode_out_carry);
- $display("%3d: EXEC: Stall: %d, Bubble: %d, Instruction: %08x, PC: %08x, Reg: %d, [%08x -> %d], Jmp: %d [%08x]", clockno, stall_cause_execute, bubble_out_execute, insn_out_execute, pc_out_execute, execute_out_write_reg, execute_out_write_data, execute_out_write_num, jmp, jmppc);
+ $display("%3d: DECODE: op0 %08x, op1 %08x, op2 %08x, carry %d", clockno, decode_out_op0, decode_out_op1, decode_out_op2, decode_out_carry);
+ $display("%3d: EXEC: Stall: %d, Bubble: %d, Instruction: %08x, PC: %08x, Reg: %d, [%08x -> %d], Jmp: %d [%08x]", clockno, stall_cause_execute, bubble_out_execute, insn_out_execute, pc_out_execute, execute_out_write_reg, execute_out_write_data, execute_out_write_num, jmp_out_execute, jmppc_out_execute);
$display("%3d: MEMORY: Stall: %d, Bubble: %d, Instruction: %08x, PC: %08x, Reg: %d, [%08x -> %d]", clockno, stall_cause_memory, bubble_out_memory, insn_out_memory, pc_out_memory, memory_out_write_reg, memory_out_write_data, memory_out_write_num);
+ $display("%3d: WRITEB: CPSR %08x, SPSR %08x, Reg: %d [%08x -> %d], Jmp: %d [%08x]", clockno, writeback_out_cpsr, writeback_out_spsr, regfile_write, regfile_write_data, regfile_write_reg, jmp_out_writeback, jmppc_out_writeback);
end
endmodule
git.joshuawise.com / firearm.git / blobdiff