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Remove verbosity from lsu state machine.

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This commit is contained in:
Ross Thompson 2021-12-19 22:41:34 -06:00
parent d3c3422d12
commit 3eb5f33705
1 changed files with 27 additions and 72 deletions
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99
wally-pipelined/src/lsu/lsu.sv
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@ -150,76 +150,30 @@ module lsu
always_comb begin
case(CurrState)
STATE_T0_READY: begin
if(~ITLBMissF & DTLBMissM & AnyCPUReqM) begin
NextState = STATE_T3_DTLB_MISS;
end
else if(ITLBMissF & ~DTLBMissM & ~AnyCPUReqM) begin
NextState = STATE_T4_ITLB_MISS;
end
else if(ITLBMissF & ~DTLBMissM & AnyCPUReqM) begin
NextState = STATE_T5_ITLB_MISS;
end
else if(ITLBMissF & DTLBMissM & AnyCPUReqM) begin
NextState = STATE_T7_DITLB_MISS;
end else begin
NextState = STATE_T0_READY;
end
end
STATE_T0_REPLAY: begin
if(DCacheStall) begin
NextState = STATE_T0_REPLAY;
end else begin
NextState = STATE_T0_READY;
end
end
STATE_T3_DTLB_MISS: begin
if(WalkerLoadPageFaultM | WalkerStorePageFaultM) begin
NextState = STATE_T0_READY;
end else if(DTLBWriteM) begin
NextState = STATE_T0_REPLAY;
end else begin
NextState = STATE_T3_DTLB_MISS;
end
end
STATE_T4_ITLB_MISS: begin
if(WalkerInstrPageFaultRaw | ITLBWriteF) begin
NextState = STATE_T0_READY;
end else begin
NextState = STATE_T4_ITLB_MISS;
end
end
STATE_T5_ITLB_MISS: begin
if(ITLBWriteF) begin
NextState = STATE_T0_REPLAY;
end else if(WalkerInstrPageFaultRaw) begin
NextState = STATE_T0_FAULT_REPLAY;
end else begin
NextState = STATE_T5_ITLB_MISS;
end
end
STATE_T0_FAULT_REPLAY: begin
if(DCacheStall) begin
NextState = STATE_T0_FAULT_REPLAY;
end else begin
NextState = STATE_T0_READY;
end
end
STATE_T7_DITLB_MISS: begin
if(WalkerStorePageFaultM | WalkerLoadPageFaultM) begin
NextState = STATE_T0_READY;
end else if(DTLBWriteM) begin
NextState = STATE_T5_ITLB_MISS;
end else begin
NextState = STATE_T7_DITLB_MISS;
end
end
default: begin
NextState = STATE_T0_READY;
end
STATE_T0_READY: if(~ITLBMissF & DTLBMissM & AnyCPUReqM) NextState = STATE_T3_DTLB_MISS;
else if(ITLBMissF & ~DTLBMissM & ~AnyCPUReqM) NextState = STATE_T4_ITLB_MISS;
else if(ITLBMissF & ~DTLBMissM & AnyCPUReqM) NextState = STATE_T5_ITLB_MISS;
else if(ITLBMissF & DTLBMissM & AnyCPUReqM) NextState = STATE_T7_DITLB_MISS;
else NextState = STATE_T0_READY;
STATE_T0_REPLAY: if(DCacheStall) NextState = STATE_T0_REPLAY;
else NextState = STATE_T0_READY;
STATE_T3_DTLB_MISS: if(WalkerLoadPageFaultM | WalkerStorePageFaultM) NextState = STATE_T0_READY;
else if(DTLBWriteM) NextState = STATE_T0_REPLAY;
else NextState = STATE_T3_DTLB_MISS;
STATE_T4_ITLB_MISS: if(WalkerInstrPageFaultRaw | ITLBWriteF) NextState = STATE_T0_READY;
else NextState = STATE_T4_ITLB_MISS;
STATE_T5_ITLB_MISS: if(ITLBWriteF) NextState = STATE_T0_REPLAY;
else if(WalkerInstrPageFaultRaw) NextState = STATE_T0_FAULT_REPLAY;
else NextState = STATE_T5_ITLB_MISS;
STATE_T0_FAULT_REPLAY: if(DCacheStall) NextState = STATE_T0_FAULT_REPLAY;
else NextState = STATE_T0_READY;
STATE_T7_DITLB_MISS: if(WalkerStorePageFaultM | WalkerLoadPageFaultM) NextState = STATE_T0_READY;
else if(DTLBWriteM) NextState = STATE_T5_ITLB_MISS;
else NextState = STATE_T7_DITLB_MISS;
default: NextState = STATE_T0_READY;
endcase
end // always_comb
// signal to CPU it needs to wait on HPTW.
/* -----\/----- EXCLUDED -----\/-----
// this code has a problem with imperas64mmu as it reads in an invalid uninitalized instruction. InterlockStall becomes x and it propagates
@ -330,12 +284,13 @@ module lsu
assign DTLBStorePageFaultM = DTLBPageFaultM & MemRWMtoLRSC[0];
// Determine if an Unaligned access is taking place
// hptw guarantees alignment, only check inputs from IEU.
always_comb
case(Funct3MtoDCache[1:0])
case(Funct3M[1:0])
2'b00: DataMisalignedM = 0; // lb, sb, lbu
2'b01: DataMisalignedM = MemPAdrNoTranslate[0]; // lh, sh, lhu
2'b10: DataMisalignedM = MemPAdrNoTranslate[1] | MemPAdrNoTranslate[0]; // lw, sw, flw, fsw, lwu
2'b11: DataMisalignedM = |MemPAdrNoTranslate[2:0]; // ld, sd, fld, fsd
2'b01: DataMisalignedM = IEUAdrM[0]; // lh, sh, lhu
2'b10: DataMisalignedM = IEUAdrM[1] | IEUAdrM[0]; // lw, sw, flw, fsw, lwu
2'b11: DataMisalignedM = |IEUAdrM[2:0]; // ld, sd, fld, fsd
endcase
// Determine if address is valid