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https://gitlab.com/brendanhaines/cpu.git
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properly flushes pipeline after jump
This commit is contained in:
parent
c25b9bcb0f
commit
1290418aa3
136
hdl/core.v
136
hdl/core.v
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@ -64,6 +64,10 @@ module core(
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output dummy_out
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);
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parameter PIPELINED = 1;
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localparam INST_NOP = 32'h00000013; // nop
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// Register File
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reg [31:0] regfile [0:31];
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initial begin : init_regfile
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@ -75,10 +79,8 @@ end
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// Registers
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reg [31:0] r_if_pc = 0, r_id_pc, r_ex_pc, r_mem_pc, r_wb_pc;
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reg r_id_stall, r_ex_stall, r_mem_stall, r_wb_stall;
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reg [31:0] r_id_inst, r_ex_inst, r_mem_inst, r_wb_inst;
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reg [4:0] r_ex_rd, r_mem_rd, r_wb_rd;
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reg r_ex_alu_seed;
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reg [3:0] r_ex_aluop;
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reg [31:0] r_ex_s1, r_ex_s2, r_mem_s1, r_mem_s2;
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reg [31:0] r_mem_alu_out, r_wb_alu_out;
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@ -86,22 +88,23 @@ reg r_mem_alu_zero;
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reg r_ex_jump;
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reg r_ex_store, r_mem_store;
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reg r_ex_load, r_mem_load;
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reg [31:0] r_mem_wdata, r_wb_wdata;
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reg r_id_valid=0, r_ex_valid=0, r_mem_valid=0, r_wb_valid=0;
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// IF
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reg s_if_halt;
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reg s_if_stall = 0;
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reg [31:0] s_if_next_pc;
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reg [31:0] s_if_inst;
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reg s_if_stall;
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always @(*) begin
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s_if_halt = 0;
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s_if_stall = s_id_stall || 0;
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if (r_ex_jump) begin
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if (r_ex_jump && r_ex_valid) begin
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s_if_next_pc = s_ex_alu_out;
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s_if_stall = 1'b1;
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// s_if_stall = 1'b1;
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end else begin
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s_if_next_pc = r_if_pc + 4;
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s_if_stall = 1'b0;
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// s_if_stall = 1'b0;
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end
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mem_inst_addr = r_if_pc;
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@ -109,7 +112,7 @@ always @(*) begin
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end
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// ID
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reg s_id_halt;
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reg s_id_stall;
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reg [6:0] s_id_opcode;
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reg [2:0] s_id_funct3;
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reg [6:0] s_id_funct7;
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@ -117,7 +120,6 @@ reg [4:0] s_id_rd, s_id_rs1, s_id_rs2;
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reg [31:0] s_id_immed_itype, s_id_immed_stype, s_id_immed_utype, s_id_immed_btype, s_id_immed_jtype;
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reg [31:0] s_id_s1, s_id_s2;
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reg [3:0] s_id_aluop;
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reg s_id_alu_seed;
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reg s_id_invalid;
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reg s_id_jump, s_id_branch;
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reg s_id_store, s_id_load;
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@ -154,7 +156,7 @@ localparam ALUOP_ADD = 4'b0000,
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always @(*) begin
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s_id_halt = 0;
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s_id_stall = s_ex_stall || 0;
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s_id_invalid = 0;
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s_id_store = 0;
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s_id_load = 0;
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@ -272,21 +274,20 @@ always @(*) begin
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if (s_id_invalid) begin
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$display("%0t:\tInvalid instruction at PC=0x%h", $time, r_id_pc);
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s_id_halt = 1'b1;
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s_id_aluop = 3'hx;
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s_id_alu_seed = 1'bx;
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end
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end
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// EX
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reg s_ex_halt;
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reg s_ex_stall;
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reg [31:0] s_ex_data1, s_ex_data2;
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reg [31:0] s_ex_alu_out;
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reg s_ex_alu_zero;
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reg [31:0] s_ex_ra;
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reg [31:0] s_ex_wdata;
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always @(*) begin
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s_ex_halt = 0;
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s_ex_stall = s_mem_stall || 0;
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// NOTE: s_ex_data* exist for adding data paths bypassing regfile in the future
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s_ex_data1 = r_ex_s1;
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@ -324,21 +325,25 @@ always @(*) begin
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s_ex_alu_out = s_ex_data1 < s_ex_data2;
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end
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default: begin
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s_ex_halt = 1;
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s_ex_alu_out = 32'hxxxxxxxx;
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end
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endcase
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s_ex_alu_zero = (s_ex_alu_out == 0);
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s_ex_ra = r_ex_pc + 4;
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if (r_ex_jump) begin
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s_ex_wdata = s_ex_ra;
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end else begin
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s_ex_wdata = s_ex_alu_out;
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end
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end
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// MEM
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reg s_mem_halt;
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reg s_mem_stall;
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reg s_mem_bp;
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always @(*) begin
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s_mem_halt = 0;
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s_mem_stall = s_wb_stall || 0;
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s_mem_bp = 0;
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// if (r_mem_store) begin
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@ -357,74 +362,93 @@ always @(*) begin
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end
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// WB
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reg s_wb_halt;
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reg s_wb_stall;
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reg [31:0] s_wb_data;
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reg s_wb_write;
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always @(*) begin
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s_wb_halt = 0;
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s_wb_stall = 1'b0;
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// load instructions do not use output of alu in wb
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s_wb_data = r_wb_alu_out;
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s_wb_data = r_wb_wdata;
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// FIXME: always writes!!!
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s_wb_write = !r_wb_stall;
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s_wb_write = 1; //!s_wb_stall;
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end
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// SYS
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reg s_sys_halt;
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always @(*) begin
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s_sys_halt = s_if_halt || s_id_halt || s_ex_halt || s_mem_halt || s_wb_halt;
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end
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// Register update
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always @(posedge clk) begin
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always @(posedge clk) begin: pipeline_update
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integer i;
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if (reset) begin
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r_if_pc <= 32'h00000000;
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// rather than resetting all flip-flops just stall the pipeline so values are ignored.
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r_id_stall <= 1;
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r_ex_stall <= 1;
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r_mem_stall <= 1;
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r_wb_stall <= 1;
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r_id_pc <= 0;
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r_id_inst <= INST_NOP;
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r_ex_pc <= 0;
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r_ex_inst <= INST_NOP;
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r_ex_rd <= 0;
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r_ex_s1 <= 0;
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r_ex_s2 <= 0;
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r_ex_aluop <= 0;
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r_ex_jump <= 0;
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r_ex_store <= 0;
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r_ex_load <= 0;
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r_mem_pc <= 0;
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r_mem_inst <= INST_NOP;
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r_mem_rd <= 0;
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r_mem_s1 <= 0;
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r_mem_s2 <= 0;
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r_mem_alu_out <= 0;
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r_mem_alu_zero <= 0;
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r_mem_store <= 0;
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r_mem_load <= 0;
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r_mem_wdata <= 0;
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r_wb_pc <= 0;
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r_wb_inst <= INST_NOP;
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r_wb_rd <= 0;
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r_wb_alu_out <= 0;
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r_wb_wdata <= 0;
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for (i=1; i<32; i=i+1) begin
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regfile[i] <= 0;
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end
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end else begin
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// NOTE: halt disabled because startup causes hault
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// if (s_sys_halt && 0) begin
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// // stay halted forever
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// end else begin
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// IF
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// if (!s_mem_bp) begin
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if (!s_if_stall) begin
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r_if_pc <= s_if_next_pc;
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// end
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end
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// ID
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// if (!s_mem_bp) begin
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r_id_stall <= s_if_stall;
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if (!s_id_stall) begin
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r_id_pc <= r_if_pc;
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r_id_inst <= s_if_inst;
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// end
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r_id_valid <= ~(r_ex_jump && r_ex_valid);
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end
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// EX
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// if (!s_mem_bp) begin
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if (!s_ex_stall) begin
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// TODO: also stall EX if taking branch
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r_ex_stall <= r_id_stall;
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r_ex_pc <= r_id_pc;
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r_ex_inst <= r_id_inst;
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r_ex_rd <= s_id_rd;
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r_ex_s1 <= s_id_s1;
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r_ex_s2 <= s_id_s2;
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r_ex_aluop <= s_id_aluop;
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r_ex_alu_seed <= s_id_alu_seed;
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r_ex_jump <= s_id_jump;
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r_ex_store <= s_id_store;
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r_ex_load <= s_id_load;
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// end
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r_ex_valid <= r_id_valid && ~(r_ex_jump && r_ex_valid);
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end
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// MEM
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// if (!s_mem_bp) begin
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r_mem_stall <= r_ex_stall;
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if (!s_mem_stall) begin
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r_mem_pc <= r_ex_pc;
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r_mem_inst <= r_ex_inst;
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r_mem_rd <= r_ex_rd;
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@ -434,21 +458,25 @@ always @(posedge clk) begin
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r_mem_alu_zero <= s_ex_alu_zero;
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r_mem_store <= r_ex_store;
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r_mem_load <= r_ex_load;
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// end
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r_mem_wdata <= s_ex_wdata;
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r_mem_valid <= r_ex_valid;
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end
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// WB
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// if (!s_mem_bp) begin
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r_wb_stall <= r_mem_stall;
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if (!s_wb_stall) begin
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r_wb_pc <= r_mem_pc;
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r_wb_inst <= r_mem_inst;
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r_wb_rd <= r_mem_rd;
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r_wb_alu_out <= r_mem_alu_out;
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// end
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r_wb_wdata <= r_mem_wdata;
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r_wb_valid <= r_mem_valid;
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end
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// Register File
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if (r_wb_rd != 0 && s_wb_write) begin
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// TODO: should I write if s_wb_stall=1?
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if (r_wb_rd != 0 && s_wb_write && r_wb_valid) begin
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regfile[r_wb_rd] <= s_wb_data;
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end
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// end
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end
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end
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@ -15,6 +15,8 @@ wire [31:0] mem_inst_addr;
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wire [31:0] mem_inst_idx = mem_inst_addr >> 2;
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wire [31:0] mem_inst_data = mem_inst_idx < MEM_INST_LENGTH ? mem_inst[mem_inst_idx] : INST_NOP;
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wire dummy_out;
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initial begin: mem_inst_init
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integer i;
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for (i=0; i<MEM_INST_LENGTH; i=i+1) begin
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@ -52,7 +54,7 @@ core dut(
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.reset(reset),
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.mem_inst_addr(mem_inst_addr),
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.mem_inst_data(mem_inst_data)
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.mem_inst_data(mem_inst_data),
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// .mem_data_addr(mem_data_addr),
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// .mem_data_wdata(mem_data_wdata),
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@ -61,6 +63,8 @@ core dut(
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// .mem_data_we(mem_data_we),
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// .mem_data_valid(mem_data_valid),
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// .mem_data_done(mem_data_done)
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.dummy_out(dummy_out)
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);
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wire axi_mem_data_awvalid;
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@ -187,6 +187,10 @@
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<wvobject fp_name="group4" type="group">
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<obj_property name="label">IF</obj_property>
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<obj_property name="DisplayName">label</obj_property>
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<wvobject fp_name="/core_tb/dut/s_if_stall" type="logic" db_ref_id="1">
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<obj_property name="ElementShortName">s_if_stall</obj_property>
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<obj_property name="ObjectShortName">s_if_stall</obj_property>
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</wvobject>
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<wvobject fp_name="/core_tb/dut/r_if_pc" type="array" db_ref_id="1">
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<obj_property name="ElementShortName">r_if_pc[31:0]</obj_property>
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<obj_property name="ObjectShortName">r_if_pc[31:0]</obj_property>
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@ -202,17 +206,17 @@
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<obj_property name="ObjectShortName">s_if_inst[31:0]</obj_property>
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<obj_property name="Radix">HEXRADIX</obj_property>
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</wvobject>
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<wvobject fp_name="/core_tb/dut/s_if_halt" type="logic" db_ref_id="1">
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<obj_property name="ElementShortName">s_if_halt</obj_property>
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<obj_property name="ObjectShortName">s_if_halt</obj_property>
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</wvobject>
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</wvobject>
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<wvobject fp_name="group5" type="group">
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<obj_property name="label">ID</obj_property>
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<obj_property name="DisplayName">label</obj_property>
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<wvobject fp_name="/core_tb/dut/r_id_stall" type="logic" db_ref_id="1">
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<obj_property name="ElementShortName">r_id_stall</obj_property>
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<obj_property name="ObjectShortName">r_id_stall</obj_property>
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<wvobject fp_name="/core_tb/dut/r_id_valid" type="logic" db_ref_id="1">
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<obj_property name="ElementShortName">r_id_valid</obj_property>
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<obj_property name="ObjectShortName">r_id_valid</obj_property>
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</wvobject>
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<wvobject fp_name="/core_tb/dut/s_id_stall" type="logic" db_ref_id="1">
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<obj_property name="ElementShortName">s_id_stall</obj_property>
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<obj_property name="ObjectShortName">s_id_stall</obj_property>
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</wvobject>
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<wvobject fp_name="/core_tb/dut/r_id_pc" type="array" db_ref_id="1">
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<obj_property name="ElementShortName">r_id_pc[31:0]</obj_property>
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@ -265,10 +269,6 @@
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<obj_property name="ElementShortName">s_id_aluop[3:0]</obj_property>
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<obj_property name="ObjectShortName">s_id_aluop[3:0]</obj_property>
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</wvobject>
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<wvobject fp_name="/core_tb/dut/s_id_alu_seed" type="logic" db_ref_id="1">
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<obj_property name="ElementShortName">s_id_alu_seed</obj_property>
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<obj_property name="ObjectShortName">s_id_alu_seed</obj_property>
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</wvobject>
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<wvobject fp_name="/core_tb/dut/s_id_jump" type="logic" db_ref_id="1">
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<obj_property name="ElementShortName">s_id_jump</obj_property>
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<obj_property name="ObjectShortName">s_id_jump</obj_property>
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@ -277,17 +277,17 @@
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<obj_property name="ElementShortName">s_id_invalid</obj_property>
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<obj_property name="ObjectShortName">s_id_invalid</obj_property>
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</wvobject>
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<wvobject fp_name="/core_tb/dut/s_id_halt" type="logic" db_ref_id="1">
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<obj_property name="ElementShortName">s_id_halt</obj_property>
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<obj_property name="ObjectShortName">s_id_halt</obj_property>
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</wvobject>
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</wvobject>
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<wvobject fp_name="group6" type="group">
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<obj_property name="label">EX</obj_property>
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<obj_property name="DisplayName">label</obj_property>
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<wvobject fp_name="/core_tb/dut/r_ex_stall" type="logic" db_ref_id="1">
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<obj_property name="ElementShortName">r_ex_stall</obj_property>
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<obj_property name="ObjectShortName">r_ex_stall</obj_property>
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<wvobject fp_name="/core_tb/dut/r_ex_valid" type="logic" db_ref_id="1">
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<obj_property name="ElementShortName">r_ex_valid</obj_property>
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<obj_property name="ObjectShortName">r_ex_valid</obj_property>
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</wvobject>
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<wvobject fp_name="/core_tb/dut/s_ex_stall" type="logic" db_ref_id="1">
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<obj_property name="ElementShortName">s_ex_stall</obj_property>
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<obj_property name="ObjectShortName">s_ex_stall</obj_property>
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</wvobject>
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<wvobject fp_name="/core_tb/dut/r_ex_pc" type="array" db_ref_id="1">
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<obj_property name="ElementShortName">r_ex_pc[31:0]</obj_property>
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@ -318,10 +318,6 @@
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<obj_property name="ElementShortName">r_ex_aluop[3:0]</obj_property>
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<obj_property name="ObjectShortName">r_ex_aluop[3:0]</obj_property>
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</wvobject>
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<wvobject fp_name="/core_tb/dut/r_ex_alu_seed" type="logic" db_ref_id="1">
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<obj_property name="ElementShortName">r_ex_alu_seed</obj_property>
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<obj_property name="ObjectShortName">r_ex_alu_seed</obj_property>
|
||||
</wvobject>
|
||||
<wvobject fp_name="/core_tb/dut/s_ex_data1" type="array" db_ref_id="1">
|
||||
<obj_property name="ElementShortName">s_ex_data1[31:0]</obj_property>
|
||||
<obj_property name="ObjectShortName">s_ex_data1[31:0]</obj_property>
|
||||
|
|
@ -345,17 +341,17 @@
|
|||
<obj_property name="ElementShortName">r_ex_jump</obj_property>
|
||||
<obj_property name="ObjectShortName">r_ex_jump</obj_property>
|
||||
</wvobject>
|
||||
<wvobject fp_name="/core_tb/dut/s_ex_halt" type="logic" db_ref_id="1">
|
||||
<obj_property name="ElementShortName">s_ex_halt</obj_property>
|
||||
<obj_property name="ObjectShortName">s_ex_halt</obj_property>
|
||||
</wvobject>
|
||||
</wvobject>
|
||||
<wvobject fp_name="group7" type="group">
|
||||
<obj_property name="label">MEM</obj_property>
|
||||
<obj_property name="DisplayName">label</obj_property>
|
||||
<wvobject fp_name="/core_tb/dut/r_mem_stall" type="logic" db_ref_id="1">
|
||||
<obj_property name="ElementShortName">r_mem_stall</obj_property>
|
||||
<obj_property name="ObjectShortName">r_mem_stall</obj_property>
|
||||
<wvobject fp_name="/core_tb/dut/r_mem_valid" type="logic" db_ref_id="1">
|
||||
<obj_property name="ElementShortName">r_mem_valid</obj_property>
|
||||
<obj_property name="ObjectShortName">r_mem_valid</obj_property>
|
||||
</wvobject>
|
||||
<wvobject fp_name="/core_tb/dut/s_mem_stall" type="logic" db_ref_id="1">
|
||||
<obj_property name="ElementShortName">s_mem_stall</obj_property>
|
||||
<obj_property name="ObjectShortName">s_mem_stall</obj_property>
|
||||
</wvobject>
|
||||
<wvobject fp_name="/core_tb/dut/r_mem_pc" type="array" db_ref_id="1">
|
||||
<obj_property name="ElementShortName">r_mem_pc[31:0]</obj_property>
|
||||
|
|
@ -381,17 +377,17 @@
|
|||
<obj_property name="ElementShortName">r_mem_alu_zero</obj_property>
|
||||
<obj_property name="ObjectShortName">r_mem_alu_zero</obj_property>
|
||||
</wvobject>
|
||||
<wvobject fp_name="/core_tb/dut/s_mem_halt" type="logic" db_ref_id="1">
|
||||
<obj_property name="ElementShortName">s_mem_halt</obj_property>
|
||||
<obj_property name="ObjectShortName">s_mem_halt</obj_property>
|
||||
</wvobject>
|
||||
</wvobject>
|
||||
<wvobject fp_name="group8" type="group">
|
||||
<obj_property name="label">WB</obj_property>
|
||||
<obj_property name="DisplayName">label</obj_property>
|
||||
<wvobject fp_name="/core_tb/dut/r_wb_stall" type="logic" db_ref_id="1">
|
||||
<obj_property name="ElementShortName">r_wb_stall</obj_property>
|
||||
<obj_property name="ObjectShortName">r_wb_stall</obj_property>
|
||||
<wvobject fp_name="/core_tb/dut/r_wb_valid" type="logic" db_ref_id="1">
|
||||
<obj_property name="ElementShortName">r_wb_valid</obj_property>
|
||||
<obj_property name="ObjectShortName">r_wb_valid</obj_property>
|
||||
</wvobject>
|
||||
<wvobject fp_name="/core_tb/dut/s_wb_stall" type="logic" db_ref_id="1">
|
||||
<obj_property name="ElementShortName">s_wb_stall</obj_property>
|
||||
<obj_property name="ObjectShortName">s_wb_stall</obj_property>
|
||||
</wvobject>
|
||||
<wvobject fp_name="/core_tb/dut/r_wb_pc" type="array" db_ref_id="1">
|
||||
<obj_property name="ElementShortName">r_wb_pc[31:0]</obj_property>
|
||||
|
|
@ -418,9 +414,5 @@
|
|||
<obj_property name="ObjectShortName">s_wb_data[31:0]</obj_property>
|
||||
<obj_property name="Radix">HEXRADIX</obj_property>
|
||||
</wvobject>
|
||||
<wvobject fp_name="/core_tb/dut/s_wb_halt" type="logic" db_ref_id="1">
|
||||
<obj_property name="ElementShortName">s_wb_halt</obj_property>
|
||||
<obj_property name="ObjectShortName">s_wb_halt</obj_property>
|
||||
</wvobject>
|
||||
</wvobject>
|
||||
</wave_config>
|
||||
|
|
|
|||
|
|
@ -201,7 +201,7 @@ _start:
|
|||
auipc x3, 0 # x3 = pc + 0
|
||||
auipc x4, 3 # x4 = pc + 0x3000
|
||||
auipc x5, 0xfffff # x5 = pc + 0xfffff000
|
||||
# TODO: verify auipc adds and does not concatenate
|
||||
# TODO: verify auipc adds and does not concatenate (must have PC>0xfff for this)
|
||||
nop
|
||||
nop
|
||||
nop
|
||||
|
|
@ -221,7 +221,12 @@ loop:
|
|||
nop
|
||||
nop
|
||||
nop
|
||||
j loop # loop forever
|
||||
jal x1, loop # loop forever
|
||||
addi x2, x0, 0 # NOTE: this should never be executed
|
||||
addi x3, x0, 0 # NOTE: this should never be executed
|
||||
addi x4, x0, 0 # NOTE: this should never be executed
|
||||
addi x5, x0, 0 # NOTE: this should never be executed
|
||||
addi x6, x0, 0 # NOTE: this should never be executed
|
||||
nop
|
||||
nop
|
||||
nop
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user