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[Add] add forwarding

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包焕垲
2023-05-22 13:34:31 +08:00
parent 029a8823f4
commit bf41b61af0
9 changed files with 205 additions and 41 deletions
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38
lacpu/rtl/cpu/cpu_top.v
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@@ -38,6 +38,13 @@ module mycpu_top(
wire [`MS_TO_WS_BUS_WD -1:0] ms_to_ws_bus;
wire [`WS_TO_RF_BUS_WD -1:0] ws_to_rf_bus;
wire [`BR_BUS_WD -1:0] br_bus;
wire [`DS_TO_FW_BUS_WD -1:0] ds_to_fw_bus;
wire [`ES_TO_FW_BUS_WD -1:0] es_to_fw_bus;
wire [`MS_TO_FW_BUS_WD -1:0] ms_to_fw_bus;
wire [`FW_TO_ES_BUS_WD -1:0] fw_to_es_bus;
wire [`MS_TO_ES_BUS_WD -1:0] ms_to_es_bus;
wire [`WS_TO_ES_BUS_WD -1:0] ws_to_es_bus;
// IF stage
if_stage if_stage(
@@ -71,7 +78,9 @@ module mycpu_top(
.ds_to_es_valid (ds_to_es_valid ),
.ds_to_es_bus (ds_to_es_bus ),
//to rf: for write back
.ws_to_rf_bus (ws_to_rf_bus )
.ws_to_rf_bus (ws_to_rf_bus ),
.ds_to_fw_bus (ds_to_fw_bus )
);
// EXE stage
exe_stage exe_stage(
@@ -86,6 +95,14 @@ module mycpu_top(
//to ms
.es_to_ms_valid (es_to_ms_valid ),
.es_to_ms_bus (es_to_ms_bus ),
//from fw
.fw_to_es_bus (fw_to_es_bus ),
//to fw
.es_to_fw_bus (es_to_fw_bus ),
//from ms
.ms_to_ds_bus (ms_to_es_bus ),
//from ws
.ws_to_ds_bus (ws_to_es_bus ),
// data sram interface
.data_sram_en (data_sram_en ),
.data_sram_wen (data_sram_wen ),
@@ -108,7 +125,11 @@ module mycpu_top(
//to fs
.br_bus (br_bus ),
//from data-sram
.data_sram_rdata(data_sram_rdata)
.data_sram_rdata(data_sram_rdata),
//to fw
.ms_to_fw_bus (ms_to_fw_bus ),
//to es
.ms_to_es_bus (ms_to_es_bus )
);
// WB stage
wb_stage wb_stage(
@@ -121,6 +142,8 @@ module mycpu_top(
.ms_to_ws_bus (ms_to_ws_bus ),
//to rf: for write back
.ws_to_rf_bus (ws_to_rf_bus ),
//to es
.ws_to_es_bus (ws_to_es_bus ),
//trace debug interface
.debug_wb_pc (debug_wb_pc ),
.debug_wb_rf_wen (debug_wb_rf_wen ),
@@ -128,4 +151,15 @@ module mycpu_top(
.debug_wb_rf_wdata(debug_wb_rf_wdata)
);
// Forwarding
forward forward(
.clk (clk ),
.reset (reset ),
.ds_to_fw_bus (ds_to_fw_bus),
.es_to_fw_bus (es_to_fw_bus),
.ms_to_fw_bus (ms_to_fw_bus),
.fw_to_es_bus (fw_to_es_bus)
);
endmodule

58
lacpu/rtl/cpu/exe_stage.v
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@@ -16,7 +16,15 @@ module exe_stage(
output data_sram_en ,
output [ 3:0] data_sram_wen ,
output [31:0] data_sram_addr ,
output [31:0] data_sram_wdata
output [31:0] data_sram_wdata,
//to fw
output [`ES_TO_FW_BUS_WD -1:0] es_to_fw_bus ,
//from fw
input [`FW_TO_ES_BUS_WD -1:0] fw_to_es_bus ,
//from ms
input [`MS_TO_ES_BUS_WD -1:0] ms_to_ds_bus ,
//from ws
input [`WS_TO_ES_BUS_WD -1:0] ws_to_ds_bus
);
reg es_valid ;
@@ -39,6 +47,15 @@ module exe_stage(
wire [31:0] es_rf_rdata2;
wire [31:0] es_pc;
wire [31:0] ms_alu_result;
wire [31:0] ws_rf_wdata;
wire es_src1_is_es_dest;
wire es_src1_is_ms_dest;
wire es_src2_is_es_dest;
wire es_src2_is_ms_dest;
wire es_data_is_rf_wdata;
assign {es_alu_op , //166:155
es_src1_is_pc , //154:154
@@ -57,6 +74,16 @@ module exe_stage(
es_pc //31 :0
} = ds_to_es_bus_r;
assign {es_src1_is_es_dest ,
es_src1_is_ms_dest ,
es_src2_is_es_dest ,
es_src2_is_ms_dest ,
es_data_is_rf_wdata
} = fw_to_es_bus;
assign ms_alu_result = ms_to_ds_bus;
assign ws_rf_wdata = ws_to_ds_bus;
wire [31:0] br_target;
wire [31:0] es_alu_src1 ;
@@ -81,6 +108,12 @@ module exe_stage(
es_pc //31 :0
};
assign es_to_fw_bus = {es_rf_rdata2 ,
es_dest ,
es_reg_we ,
es_mem_we
};
assign es_ready_go = 1'b1;
assign es_allowin = !es_valid || es_ready_go && ms_allowin;
assign es_to_ms_valid = es_valid && es_ready_go;
@@ -97,11 +130,15 @@ module exe_stage(
end
end
assign es_alu_src1 = es_src1_is_pc ? es_pc :
es_rf_rdata1;
assign es_alu_src2 = es_src2_is_imm ? es_imm :
es_src2_is_4 ? 32'd4 :
es_rf_rdata2;
assign es_alu_src1 = es_src1_is_pc ? es_pc :
es_src1_is_es_dest ? ms_alu_result :
es_src1_is_ms_dest ? ws_rf_wdata :
es_rf_rdata1;
assign es_alu_src2 = es_src2_is_imm ? es_imm :
es_src2_is_4 ? 32'd4 :
es_src2_is_es_dest ? ms_alu_result :
es_src2_is_ms_dest ? ws_rf_wdata :
es_rf_rdata2;
alu u_alu(
.alu_op (es_alu_op ),
@@ -126,10 +163,11 @@ module exe_stage(
: 4'b0000;
assign data_sram_addr = es_alu_result;
assign data_sram_wdata = es_store_op[0] ? {4{es_rf_rdata2[ 7:0]}} :
es_store_op[1] ? {2{es_rf_rdata2[15:0]}} :
es_store_op[2] ? es_rf_rdata2 :
32'b0;
assign data_sram_wdata = es_data_is_rf_wdata ? ws_rf_wdata :
es_store_op[0] ? {4{es_rf_rdata2[ 7:0]}} :
es_store_op[1] ? {2{es_rf_rdata2[15:0]}} :
es_store_op[2] ? es_rf_rdata2 :
32'b0;
assign br_target = (^es_branch_op[5:0]) ? (es_pc + es_imm) :
( es_branch_op[7:6]) ? (es_pc + es_imm) :

63
lacpu/rtl/cpu/forward.v Normal file
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@@ -0,0 +1,63 @@
`include "mycpu.v"
module forward(
input clk ,
input reset ,
input [`DS_TO_FW_BUS_WD -1:0] ds_to_fw_bus,
input [`ES_TO_FW_BUS_WD -1:0] es_to_fw_bus,
input [`MS_TO_FW_BUS_WD -1:0] ms_to_fw_bus,
output [`FW_TO_ES_BUS_WD -1:0] fw_to_es_bus
);
reg [`DS_TO_FW_BUS_WD -1:0] ds_to_fw_bus_r;
reg [`ES_TO_FW_BUS_WD -1:0] es_to_fw_bus_r;
reg [`MS_TO_FW_BUS_WD -1:0] ms_to_fw_bus_r;
wire [4:0] ds_rf_raddr1;
wire [4:0] ds_rf_raddr2;
wire [4:0] es_rf_raddr2;
wire [4:0] es_dest;
wire [4:0] ms_dest;
wire es_mem_we;
wire es_reg_we;
wire ms_reg_we;
wire src1_is_es_dest;
wire src1_is_ms_dest;
wire src2_is_es_dest;
wire src2_is_ms_dest;
wire data_is_rf_wdata;
assign {ds_rf_raddr1, ds_rf_raddr2 } = ds_to_fw_bus_r;
assign {es_rf_rdata2, es_dest, es_reg_we, es_mem_we} = es_to_fw_bus_r;
assign {ms_dest , ms_reg_we} = ms_to_fw_bus_r;
assign fw_to_es_bus = {src1_is_es_dest , //4:4
src1_is_ms_dest , //3:3
src2_is_es_dest , //2:2
src2_is_ms_dest , //1:1
data_is_rf_wdata //0:0
};
always @(posedge clk) begin
if(reset) begin
ds_to_fw_bus_r <= 0;
es_to_fw_bus_r <= 0;
ms_to_fw_bus_r <= 0;
end
else begin
ds_to_fw_bus_r <= ds_to_fw_bus;
es_to_fw_bus_r <= es_to_fw_bus;
ms_to_fw_bus_r <= ms_to_fw_bus;
end
end
assign src1_is_ms_dest = ms_reg_we && (ms_dest != 5'b0) && (es_dest != ds_rf_raddr1) && (ms_dest == ds_rf_raddr1);
assign src1_is_es_dest = es_reg_we && (es_dest != 5'b0) && (es_dest == ds_rf_raddr1);
assign src2_is_ms_dest = ms_reg_we && (ms_dest != 5'b0) && (es_dest != ds_rf_raddr2) && (ms_dest == ds_rf_raddr2);
assign src2_is_es_dest = es_reg_we && (es_dest != 5'b0) && (es_dest == ds_rf_raddr2);
assign data_is_rf_wdata = ms_reg_we && (ms_dest != 5'b0) && (ms_dest == es_rf_raddr2) && es_mem_we;
endmodule

14
lacpu/rtl/cpu/id_stage.v
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@@ -14,7 +14,10 @@ module id_stage(
output ds_to_es_valid,
output [`DS_TO_ES_BUS_WD -1:0] ds_to_es_bus ,
//to fs
input [`WS_TO_RF_BUS_WD -1:0] ws_to_rf_bus
input [`WS_TO_RF_BUS_WD -1:0] ws_to_rf_bus ,
//to fw
output [`DS_TO_FW_BUS_WD -1:0] ds_to_fw_bus
);
reg ds_valid ;
@@ -127,6 +130,7 @@ module id_stage(
ds_pc //31 :0
};
assign ds_to_fw_bus = {rf_raddr1 , rf_raddr2};
assign ds_ready_go = 1'b1;
assign ds_allowin = !ds_valid || ds_ready_go && es_allowin;
@@ -211,10 +215,10 @@ module id_stage(
assign imm = {32{inst_slti | inst_sltui | inst_addiw | inst_ldb | inst_ldh | inst_ldw | inst_stb | inst_sth | inst_stw | inst_ldbu | inst_ldhu}} & {{20{ds_inst[21]}}, ds_inst[21:10]}
| {32{inst_beq | inst_bne | inst_bge | inst_bgeu | inst_blt | inst_bltu | inst_jirl}} & {{14{ds_inst[25]}}, ds_inst[25:10], 2'b0}
| {32{inst_andi | inst_ori | inst_xori }} & { 20'b0 , ds_inst[21:10]}
| {32{inst_lu12iw | inst_pcaddu12i }} & {{12{ds_inst[24]}}, ds_inst[24: 5]}
| {32{inst_slliw | inst_srliw | inst_sraiw}} & { 27'b0 , rk}
| {32{inst_b | inst_bl}} & {{4{ds_inst[9]}} , ds_inst[9:0], ds_inst[25:10], 2'b0};
| {32{inst_andi | inst_ori | inst_xori }} & { 20'b0 , ds_inst[21:10]}
| {32{inst_lu12iw | inst_pcaddu12i }} & { ds_inst[24: 5], 12'b0}
| {32{inst_slliw | inst_srliw | inst_sraiw}} & { 27'b0 , rk}
| {32{inst_b | inst_bl}} & {{4{ds_inst[9]}}, ds_inst[9:0], ds_inst[25:10], 2'b0};
assign src1_is_pc = inst_bl | inst_jirl | inst_pcaddu12i;
assign src2_is_4 = inst_bl | inst_jirl;

28
lacpu/rtl/cpu/mem_stage.v
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@@ -1,21 +1,25 @@
`include "mycpu.v"
module mem_stage(
input clk ,
input reset ,
input clk ,
input reset ,
//allowin
input ws_allowin ,
output ms_allowin ,
input ws_allowin ,
output ms_allowin ,
//from es
input es_to_ms_valid,
input [`ES_TO_MS_BUS_WD -1:0] es_to_ms_bus ,
input es_to_ms_valid ,
input [`ES_TO_MS_BUS_WD -1:0] es_to_ms_bus ,
//to ws
output ms_to_ws_valid,
output [`MS_TO_WS_BUS_WD -1:0] ms_to_ws_bus ,
output ms_to_ws_valid ,
output [`MS_TO_WS_BUS_WD -1:0] ms_to_ws_bus ,
//to fs
output [`BR_BUS_WD -1:0] br_bus ,
output [`BR_BUS_WD -1:0] br_bus ,
//from data-sram
input [31 :0] data_sram_rdata
input [31 :0] data_sram_rdata,
//to fw
output [`MS_TO_FW_BUS_WD -1:0] ms_to_fw_bus ,
//to es
output [`MS_TO_ES_BUS_WD -1:0] ms_to_es_bus
);
reg ms_valid;
@@ -63,6 +67,10 @@ module mem_stage(
ms_pc //31:0
};
assign ms_to_fw_bus = {ms_dest, ms_reg_we};
assign ms_to_es_bus = {ms_alu_result};
assign ms_ready_go = 1'b1;
assign ms_allowin = !ms_valid || ms_ready_go && ws_allowin;
assign ms_to_ws_valid = ms_valid && ms_ready_go;

12
lacpu/rtl/cpu/mycpu.v
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@@ -1,5 +1,5 @@
`ifndef MYCPU_H
`define MYCPU_H
`ifndef MYCPU_VH
`define MYCPU_VH
`define BR_BUS_WD 33
`define FS_TO_DS_BUS_WD 64
@@ -7,4 +7,12 @@
`define ES_TO_MS_BUS_WD 121
`define MS_TO_WS_BUS_WD 70
`define WS_TO_RF_BUS_WD 38
`define DS_TO_FW_BUS_WD 10
`define ES_TO_FW_BUS_WD 12
`define MS_TO_FW_BUS_WD 6
`define FW_TO_ES_BUS_WD 5
`define MS_TO_ES_BUS_WD 32
`define WS_TO_ES_BUS_WD 32
`endif

8
lacpu/rtl/cpu/regfile.v
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@@ -19,9 +19,13 @@ module regfile(
end
//READ OUT 1
assign rdata1 = (raddr1==5'b0) ? 32'b0 : rf[raddr1];
assign rdata1 = (raddr1==5'b0 ) ? 32'b0 :
(raddr1==waddr) ? wdata :
rf[raddr1];
//READ OUT 2
assign rdata2 = (raddr2==5'b0) ? 32'b0 : rf[raddr2];
assign rdata2 = (raddr2==5'b0 ) ? 32'b0 :
(raddr2==waddr) ? wdata :
rf[raddr2];
endmodule

4
lacpu/rtl/cpu/wb_stage.v
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@@ -10,6 +10,8 @@ module wb_stage(
input [`MS_TO_WS_BUS_WD -1:0] ms_to_ws_bus ,
//to rf: for write back
output [`WS_TO_RF_BUS_WD -1:0] ws_to_rf_bus ,
//to es
output [`WS_TO_ES_BUS_WD -1:0] ws_to_es_bus ,
//trace debug interface
output [31:0] debug_wb_pc ,
output [ 3:0] debug_wb_rf_wen ,
@@ -39,6 +41,8 @@ module wb_stage(
rf_wdata //31:0
};
assign ws_to_es_bus = {rf_wdata};
assign ws_ready_go = 1'b1;
assign ws_allowin = !ws_valid || ws_ready_go;
always @(posedge clk) begin