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Tested all that can be tested for now

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Mult/Div, Branch/Jump Linking, J needs implementation before testing and store to be tested when switched to bus
This commit is contained in:
jl7719 2020-12-13 14:40:16 +09:00
parent c31344c55f
commit 943745a1e0
44 changed files with 170 additions and 104 deletions
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1
inputs/div.ref.txt Normal file
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@ -0,0 +1 @@
3

2
inputs/j.ref.txt
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@ -1 +1 @@
1
7

9
inputs/j.txt
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@ -1,6 +1,11 @@
08000004
083F0004
00000000
00000000
00000000
00000000
00000008
00000000
34020001
34020007
00000008

2
inputs/jr.ref.txt
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@ -1 +1 @@
1
16

6
inputs/jr.txt
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@ -1,7 +1,7 @@
34050014
3C05BCF0
3C05BFC0
34A50014
00A00008
00000000
00000008
34020001
34020010
00000008

2
inputs/lb.data.txt
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@ -1,4 +1,4 @@
00000000
008A0000
0000008A
00000000
00000000

4
inputs/lb.txt
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@ -1,3 +1,3 @@
34041003
80820003
34041000
80820005
00000008

2
inputs/lbu.data.txt
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@ -1,4 +1,4 @@
00000000
008A0000
0000008A
00000000
00000000

4
inputs/lbu.txt
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@ -1,3 +1,3 @@
34041003
90820003
34041000
90820006
00000008

2
inputs/lh.txt
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@ -1,3 +1,3 @@
34041003
34041000
84820004
00000008

2
inputs/lhu.txt
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@ -1,3 +1,3 @@
34041003
34041000
94820004
00000008

2
inputs/lui.txt
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@ -1,3 +1,3 @@
34045678
3C021234
34425678
00000008

2
inputs/lwl.txt
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@ -1,4 +1,4 @@
34041003
34041001
34025678
88820003
00000008

2
inputs/lwr.txt
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@ -1,4 +1,4 @@
34041003
34041002
3C021234
98820002
00000008

1
inputs/mfhi.ref.txt Normal file
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@ -0,0 +1 @@
3

1
inputs/mflo.ref.txt Normal file
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@ -0,0 +1 @@
12

1
inputs/mthi.ref.txt Normal file
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@ -0,0 +1 @@
5

1
inputs/mult.ref.txt Normal file
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@ -0,0 +1 @@
12

1
inputs/multu.ref.txt Normal file
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@ -0,0 +1 @@
12

2
inputs/ori.txt
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@ -1,5 +1,5 @@
34020008
00000008
34020008
00000000
00000000
00000000

10
inputs/reference/ibrahimreference.txt
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@ -138,15 +138,17 @@ int main(void) {
int b = -2147483647>>2; #arithemtic shift not logical - feed in 1s (sign extension)
}
ori $4, $0, 2
ori $5,$0,-2147483647
ori $4, $0, 4
ori $5,$0,0xF000
srav $2,$5,$4
SRAv $v0 $a1 $a0
jr $0
register 0 = -536870912 (first 3 bits high - rest low)
34040002
34050001
34040004
3405F000
////////
///////

55
inputs/reference/reference.txt
View file

@ -267,21 +267,21 @@ register_v0 = 0x40000000
==J Jump==
J 4
J 12
NOP
JR $0
NOP
ORI $2,$0,1
JR $0
08000004
0800000C
00000000
00000008
00000000
34020001
3402000A
00000008
register_v0 = 1
register_v0 = 10
==JALR Jump and link register==
@ -329,24 +329,24 @@ register_v0 = 2
==JR Jump register==
ORI $5,$0,0x0014
LUI $5,0xBFC0
ORI $5,$5,0x0014
JR $5
NOP
JR $0
NOP
ORI $2,$0,1
ORI $2,$0,0x10
JR $0
34050014
3C05BCF0
3C05BFC0
34A50014
00A00008
00000000
00000008
34020001
34020010
00000008
register_v0 = 1
register_v0 = 16
==LB Load byte==
@ -356,8 +356,8 @@ JR $0
-Instruction Hex
34041003
80820003
34041000
80820006
00000008
-Memory Hex
@ -434,12 +434,12 @@ register_v0 = 0x00008123
==LUI Load upper immediate==
ORI $2,$0,0x5678
LUI $2,0x1234
ORI $2,$2,0x5678
JR $0
34045678
3C021234
34425678
00000008
register_v0 = 0x12345678
@ -467,14 +467,14 @@ register_v0 = 0x12345678
==LWL Load word left==
ORI $4,$0,0x1003
ORI $4,$0,0x1001
ORI $2,$0,0x5678
LWL $2,3($4)
JR $0
-Instruction Hex
34041003
34041001
34025678
88820003
00000008
@ -490,14 +490,14 @@ register_v0 = 0x12345678
==LWR Load word right==
ORI $4,$0,0x1003
ORI $4,$0,0x1002
LUI $2,0x1234
LWR $2,2($4)
JR $0
-Instruction Hex
34041003
34041002
3C021234
98820002
00000008
@ -559,6 +559,25 @@ register_v0 = 0x12345678
//SW Store word
ori $4, $0, 0xFFFF 3404FFFF
ori $5, $0, 0x1008 34051008
sw $4, 4($5) ACA40004
ori $5, $0, 0x100C 3405100C
lw $2, 0($5) 8CA20000
jr $0 00000008
ori $4, $0, 0x1234
ori $5, $0, 0x1008
sw $4, 0($5)
lw $2, 0($5)
jr $0
3404FFFF
34051008
ACA40000
8CA20000
00000008
//XOR Bitwise exclusive or
//XORI Bitwise exclusive or immediate

1
inputs/sllv.ref.txt Normal file
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@ -0,0 +1 @@
12

4
inputs/sllv.txt
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@ -1,4 +1,4 @@
34040002
34050003
//////
//////
00851004
00000008

1
inputs/slt.ref.txt Normal file
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@ -0,0 +1 @@
1

4
inputs/slt.txt Normal file
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@ -0,0 +1,4 @@
3404FFFF
3405000B
0085102A
00000008

2
inputs/slti.txt
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@ -1,3 +1,3 @@
3404000a
28820009
00000008
28820009

3
inputs/sltiu.txt
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@ -1,3 +1,4 @@
3404000a
2c820009
00000008
2c820009

2
inputs/sra.ref.txt
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@ -1 +1 @@
-536870912
4294967040

4
inputs/sra.txt
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@ -1,3 +1,3 @@
3404000C
00041083
3404F000
00041103
00000008

1
inputs/srav.ref.txt
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@ -0,0 +1 @@
4294967040

8
inputs/srav.txt
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@ -1,4 +1,4 @@
34040002
34050001
////////
///////
34040004
3405F000
00851007
00000008

1
inputs/srlv.ref.txt Normal file
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@ -0,0 +1 @@
4

4
inputs/srlv.txt
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@ -1,4 +1,4 @@
34040002
34050010
//////
//////
00851006
00000008

1
inputs/sw.ref.txt Normal file
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@ -0,0 +1 @@
4294967295

7
inputs/sw.txt
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@ -1,4 +1,5 @@
34040005
34050001
aca40001
3404FFFF
34051008
ACA40000
8CA20000
00000008

4
rtl/mips_cpu_alu.v
View file

@ -123,11 +123,11 @@ assign ALUOps = ALUOp;
end
SRA: begin
ALURes = B >>> shamt;
ALURes = $signed(B) >>> shamt;
end
SRAV: begin
ALURes = B >>> A;
ALURes = $signed(B) >>> A;
end
EQ: begin

8
rtl/mips_cpu_control.v
View file

@ -99,6 +99,7 @@ always @(*) begin
CtrlPC = 2'd1; // Branches - Jumps relative to PC
end else if((op==J) || (op==JAL))begin
CtrlPC = 2'd2; // Jumps within 256MB Region using 26-bit immediate in J type instruction
$display("Jump PC Ctrl");
end else if((op==SPECIAL)&&(funct==JR) || (funct==JALR))begin
CtrlPC = 2'd3; // Jumps using Register.
//$display("Ctrl PC Jump Register");
@ -141,6 +142,7 @@ always @(*) begin
CtrlALUOp = 5'd23;//DIVU from ALUOps
end else if((op==LB) || (op==LBU) || (op==LH) || (op==LHU) || (op==LW) || (op==LWL) || (op==LWR) || (op==SB) || (op==SH) || (op==SW))begin
CtrlALUOp = 5'd0;//ADD from ALUOps
$display("LB IN CONTROL");
end else if(op==LUI)begin
CtrlALUOp = 5'd7;//SLL from ALUOps
end else if((op==SPECIAL)&&((funct==MTHI) || (funct==MTLO)))begin
@ -156,8 +158,10 @@ always @(*) begin
$display("ALU Op = 7 (SLL)");
end else if((op==SPECIAL)&&(funct==SLLV))begin
CtrlALUOp = 5'd8;//SLLV from ALUOps
$display("ALU Op = 9 (SLLV)");
end else if((op==SPECIAL)&&(funct==SRA))begin
CtrlALUOp = 5'd11;//SRA from ALUOps
$display("ALU Op = 11 (SRA)");
end else if((op==SPECIAL)&&(funct==SRAV))begin
CtrlALUOp = 5'd12;//SRAV from ALUOps
end else if((op==SPECIAL)&&(funct==SRL))begin
@ -167,8 +171,10 @@ always @(*) begin
CtrlALUOp = 5'd10;//SRLV from ALUOps
end else if((op==SLTI) || ((op==SPECIAL)&&(funct==SLT)))begin
CtrlALUOp = 5'd20;//SLT from ALUOps
$display("ALU Op = 20 (SLT/SLTI)");
end else if((op==SLTIU) || ((op==SPECIAL)&&(funct==SLTU)))begin
CtrlALUOp = 5'd21;//SLTU from ALUOps
$display("ALU Op = 21 (SLTU/SLTIU)");
end else if((op==SPECIAL)&&(funct==SUBU))begin
CtrlALUOp = 5'd1;//SUB from ALUOps
end else if((op==XORI) || ((op==SPECIAL)&&(funct==XOR)))begin
@ -193,7 +199,7 @@ always @(*) begin
//CtrlALUSrc logic
if((op==ADDIU) || (op==ANDI) || (op==LUI) || (op==ORI) || (op==SLTI) || (op==SLTIU) || (op==XORI) || (op==LB) || (op==LBU) || (op==LH) || (op==LHU) || (op==LW) || (op==LWL) || (op==LWR) || (op==SB) || (op==SH) || (op==SW))begin
CtrlALUSrc = 1;//ALU Bus B is fed from the 16-bit immediate sign extended to 32-bit value taken from Instr[15-0]
end else if((op==BEQ) || (op==BGTZ) || (op==BLEZ) || (op==BNE) || ((op==SPECIAL)&&((funct==ADDU) || (funct==AND) || (funct==DIV) || (funct==DIVU) || (funct==MULT) || (funct==MULTU) || (funct==OR) || (funct==SLL) || (funct==SLLV) || (funct==SLT) || (funct==SLTU) || (funct==SRAV) || (funct==SRL) || (funct==SRLV) || (funct==SUBU) || (funct==XOR))) || ((op==REGIMM)&&((rt==BGEZ) || (rt==BGEZAL) || (rt==BLTZ) || (rt==BLTZAL))))begin
end else if((op==BEQ) || (op==BGTZ) || (op==BLEZ) || (op==BNE) || ((op==SPECIAL)&&((funct==ADDU) || (funct==AND) || (funct==DIV) || (funct==DIVU) || (funct==MULT) || (funct==MULTU) || (funct==OR) || (funct==SLL) || (funct==SLLV) || (funct==SLT) || (funct==SLTU) || (funct==SRA) || (funct==SRAV) || (funct==SRL) || (funct==SRLV) || (funct==SUBU) || (funct==XOR))) || ((op==REGIMM)&&((rt==BGEZ) || (rt==BGEZAL) || (rt==BLTZ) || (rt==BLTZAL))))begin
CtrlALUSrc = 0;///ALU Bus B is fed from rt.
end else begin CtrlALUSrc = 1'bx;end

14
rtl/mips_cpu_memory.v
View file

@ -15,8 +15,8 @@ module mips_cpu_memory(
);
parameter RAM_INIT_FILE = "";
parameter MEM_INIT_FILE = "";
reg [31:0] data_memory [0:63];
reg [31:0] instr_memory [0:63];
reg [31:0] data_memory [0:31];
reg [31:0] instr_memory [0:31];
initial begin
integer i;
@ -58,11 +58,17 @@ module mips_cpu_memory(
always_ff @(posedge clk) begin
$display("Instruction Read: %h", instr_readdata);
//$display("RAM : INFO : data_read=%h, data_address = %h, mem=%h", data_read, data_address, memory[data_address]);
if (!data_read & data_write) begin //cannot read and write to memory in the same cycle
if (data_write) begin //cannot read and write to memory in the same cycle
if (instr_address != data_address) begin //cannot modify the instruction being read
data_memory[data_address>>2] <= data_writedata;
data_memory[(data_address-32'h00001000)>>2] <= data_writedata;
$display("Store in memory");
$display(data_writedata);
end
for (integer k = 0; k<$size(data_memory); k++) begin
$display("byte +%h: %h", 32'h00001000+k*4, data_memory[k]);
end
end
end
endmodule

12
rtl/mips_cpu_pc.v
View file

@ -23,6 +23,9 @@ always_ff @(posedge clk) begin
active <= 1;
pc_out <= 32'hBFC00000;
end else begin
if(pc_out == 32'd0) begin
active <= 0;
end
pc_out <= pc_next;
case(pc_ctrl)
default: begin
@ -33,15 +36,18 @@ always_ff @(posedge clk) begin
end
2'd2: begin // Jump
pc_next <= {pc_lit_next[31:28], instr[25:0], 2'b00};
$display("Im JUMPING");
$display("pc_lit_next: %h", pc_lit_next[31:28]);
$display("instr: %b", instr[25:0]);
$display("%h",pc_next);
end
2'd3: begin // Jump using Register
pc_next <= reg_readdata;
$display("Im JUMPING AROUND LOLOLOL");
$display("%h",reg_readdata);
end
endcase
end
if (pc_out == 32'd0) begin
active <= 0;
end
end
endmodule // pc

6
rtl/mips_cpu_regfile.v
View file

@ -29,6 +29,7 @@ always_ff @(negedge clk) begin
if (writereg == 5'b00000) begin
// skip writing if rd is $0
end else if (regwrite) begin
$display("%b", opcode);
case (opcode)
6'b100000: begin //lb, load byte
case (readdata1[1:0])
@ -37,6 +38,8 @@ always_ff @(negedge clk) begin
2'b10: memory[writereg] <= {{24{writedata[23]}}, writedata[23:16]};
2'b11: memory[writereg] <= {{24{writedata[31]}}, writedata[31:24]};
endcase // readdata1[1:0]
$display("writedata %h", writedata);
$display("memory writereg %h", memory[writereg]);
end
6'b100100: begin //lbu, load byte unsigned
case (readdata1[1:0])
@ -59,9 +62,6 @@ always_ff @(negedge clk) begin
endcase // readdata1[1:0]
end
6'b100010: begin //lwl, load word left
$display("LWLWLWLWLWLWWL");
$display(readdata1[1:0]);
$display("%h",memory[writereg]);
case (readdata1[1:0])
2'b00: memory[writereg][31:24] <= writedata[7:0];
2'b01: memory[writereg][31:16] <= writedata[15:0];

53
test/test_mips_cpu_custom.sh
View file

@ -1,15 +1,15 @@
#!/bin/bash
#:'
# arithmetic
bash test/test_mips_cpu_harvard.sh rtl addu #Pass
bash test/test_mips_cpu_harvard.sh rtl addiu #Pass
bash test/test_mips_cpu_harvard.sh rtl ori #Pass
bash test/test_mips_cpu_harvard.sh rtl subu #Pass
bash test/test_mips_cpu_harvard.sh rtl and #Pass
bash test/test_mips_cpu_harvard.sh rtl andi #Pass
bash test/test_mips_cpu_harvard.sh rtl or #Pass
bash test/test_mips_cpu_harvard.sh rtl ori #Pass
bash test/test_mips_cpu_harvard.sh rtl xor #Pass
bash test/test_mips_cpu_harvard.sh rtl xori #Pass
bash test/test_mips_cpu_harvard.sh rtl subu #Pass
#bash test/test_mips_cpu_harvard.sh rtl div
#bash test/test_mips_cpu_harvard.sh rtl divu
#bash test/test_mips_cpu_harvard.sh rtl mthi
@ -29,38 +29,39 @@ bash test/test_mips_cpu_harvard.sh rtl bltzal #Pass
bash test/test_mips_cpu_harvard.sh rtl bne #Pass
# jumps
#bash test/test_mips_cpu_harvard.sh rtl j
#bash test/test_mips_cpu_harvard.sh rtl jalr
#bash test/test_mips_cpu_harvard.sh rtl jal
#bash test/test_mips_cpu_harvard.sh rtl jr
#bash test/test_mips_cpu_harvard.sh rtl j #Need new testcase
#bash test/test_mips_cpu_harvard.sh rtl jalr #Again how to link?
#bash test/test_mips_cpu_harvard.sh rtl jal #how to link?
bash test/test_mips_cpu_harvard.sh rtl jr #Pass
# shift
bash test/test_mips_cpu_harvard.sh rtl sll #Pass
bash test/test_mips_cpu_harvard.sh rtl srl #Pass
#bash test/test_mips_cpu_harvard.sh rtl sra
#bash test/test_mips_cpu_harvard.sh rtl srav
#bash test/test_mips_cpu_harvard.sh rtl srlv
#'
bash test/test_mips_cpu_harvard.sh rtl sra #Pass
bash test/test_mips_cpu_harvard.sh rtl srav #Pass
bash test/test_mips_cpu_harvard.sh rtl sllv #Pass
bash test/test_mips_cpu_harvard.sh rtl srlv #Pass
# load & store
bash test/test_mips_cpu_harvard.sh rtl lw #Pass
bash test/test_mips_cpu_harvard.sh rtl lb
bash test/test_mips_cpu_harvard.sh rtl lbu
bash test/test_mips_cpu_harvard.sh rtl lh
bash test/test_mips_cpu_harvard.sh rtl lhu
bash test/test_mips_cpu_harvard.sh rtl lui
bash test/test_mips_cpu_harvard.sh rtl lwl
bash test/test_mips_cpu_harvard.sh rtl lwr
#bash test/test_mips_cpu_harvard.sh rtl sw
#bash test/test_mips_cpu_harvard.sh rtl sb
#bash test/test_mips_cpu_harvard.sh rtl sh
bash test/test_mips_cpu_harvard.sh rtl lb #Pass
bash test/test_mips_cpu_harvard.sh rtl lbu #Pass
bash test/test_mips_cpu_harvard.sh rtl lh #Pass
bash test/test_mips_cpu_harvard.sh rtl lhu #Pass
bash test/test_mips_cpu_harvard.sh rtl lui #Pass
bash test/test_mips_cpu_harvard.sh rtl lwl #Pass
bash test/test_mips_cpu_harvard.sh rtl lwr #Pass
bash test/test_mips_cpu_harvard.sh rtl sw #Pass
#bash test/test_mips_cpu_harvard.sh rtl sb #Once switched to bus
#bash test/test_mips_cpu_harvard.sh rtl sh #Once switched to bus
# set on less than
#bash test/test_mips_cpu_harvard.sh rtl slti
#bash test/test_mips_cpu_harvard.sh rtl sltiu
#bash test/test_mips_cpu_harvard.sh rtl slt # missing
#bash test/test_mips_cpu_harvard.sh rtl sltu #Pass
# set on less than **Branch delay slots dont work on these...
bash test/test_mips_cpu_harvard.sh rtl slti #Pass
bash test/test_mips_cpu_harvard.sh rtl sltiu #Pass
bash test/test_mips_cpu_harvard.sh rtl slt #Pass
bash test/test_mips_cpu_harvard.sh rtl sltu #Pass

2
test/test_mips_cpu_harvard.sh
View file

@ -53,7 +53,7 @@ iverilog -Wall -g2012 \
-P mips_cpu_harvard_tb.RAM_INIT_FILE=\"inputs/${INSTR}.txt\" \
-P mips_cpu_harvard_tb.MEM_INIT_FILE=\"inputs/${INSTR}.data.txt\" \
-o exec/mips_cpu_harvard_tb_${INSTR} testbench/mips_cpu_harvard_tb.v \
${SRC} 2> /dev/null
${SRC} #2> /dev/null
/mnt/c/Windows/System32/cmd.exe /C vvp ./exec/mips_cpu_harvard_tb_${INSTR} &> ./inputs/${INSTR}.log.txt; # log file for debugging (contains $display)
echo "$(tail -1 ./inputs/${INSTR}.log.txt)" > ./inputs/${INSTR}.out.txt; # register v0 output to compare with reference
if diff -w ./inputs/${INSTR}.out.txt ./inputs/${INSTR}.ref.txt &> /dev/null # compare

6
testbench/mips_cpu_harvard_tb.v
View file

@ -69,7 +69,11 @@ module mips_cpu_harvard_tb;
//$display("Clk: %d", clk);
@(posedge clk);
//$display("Register v0: %d", register_v0);
$display("Reg File Write data: %d", cpuInst.in_writedata);
//$display("Reg File Write data: %d", cpuInst.in_writedata);
$display("Reg File Out Read data: %h", cpuInst.out_readdata1);
$display("Reg File opcode: %b", cpuInst.regfile.opcode);
//$display("ALU output: %h", cpuInst.out_ALURes);
//$display("ALU input B: %h", cpuInst.alu.B);
end
@(posedge clk);
$display("TB: CPU Halt; active=0");