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busybear: add support for subwords in ram

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this is really weird and i'm not sure if i did it right. I'd love if @kaveh could review it
This commit is contained in:
Noah Boorstin 2021-02-24 01:51:18 +00:00
parent 00605864fc
commit a24270c4ca
1 changed files with 11 additions and 8 deletions
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19
wally-pipelined/testbench/testbench-busybear.sv
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@ -30,6 +30,7 @@ module testbench_busybear();
// instantiate processor and memories
wallypipelinedsocbusybear dut(.*);
// initialize test
initial
begin
@ -163,18 +164,19 @@ module testbench_busybear();
end
endgenerate
`define MAX_RAM 'h8000000
logic [`XLEN-1:0] RAM[`MAX_RAM:0];
logic [`XLEN-1:0] RAM[('h8000000 >> 3):0];
logic [`XLEN-1:0] readRAM, readPC;
integer RAMAdr, RAMPC;
assign RAMAdr = HADDR - 'h80000000;
assign RAMPC = PCF - 'h80000000;
assign RAMAdr = (HADDR - 'h80000000) >> 3;
assign RAMPC = (PCF - 'h80000000) >> 3;
logic [63:0] readMask;
assign readMask = ((1 << (8*(1 << HSIZE))) - 1) << 8 * HADDR[2:0];
always @(HWDATA or HADDR or HSIZE or HWRITE or dut.hart.MemRWM[1]) begin
if ((HWRITE || dut.hart.MemRWM[1]) && (HADDR >= 'h80000000 && HADDR <= 'h87FFFFFF)) begin
if (HWRITE) begin
RAM[RAMAdr] = HWDATA;
RAM[RAMAdr] = (RAM[RAMAdr] & (~readMask)) | ((HWDATA << 8 * HADDR[2:0]) & readMask);
end else begin
readRAM = RAM[RAMAdr];
readRAM = RAM[RAMAdr] & readMask;
end
end
end
@ -199,8 +201,9 @@ module testbench_busybear();
$display("%0t ps, instr %0d: HADDR does not equal readAdrExpected: %x, %x", $time, instrs, HADDR, readAdrExpected);
`ERROR
end
if (HRDATA != readRAM && (HADDR >= 'h80000000 && HADDR <= 'h87FFFFFF)) begin
$display("warning %0t ps, instr %0d: HRDATA does not equal readRAM: %x, %x from address %x", $time, instrs, HRDATA, readRAM, HADDR);
if (((readMask & HRDATA) != (readMask & readRAM)) && (HADDR >= 'h80000000 && HADDR <= 'h87FFFFFF)) begin
$display("warning %0t ps, instr %0d: HRDATA does not equal readRAM: %x, %x from address %x, %x", $time, instrs, HRDATA, readRAM, HADDR, HSIZE);
warningCount += 1;
`ERROR
end