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Broken don't use this state.

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This commit is contained in:
Ross Thompson 2022-10-19 14:31:22 -05:00
parent c6a9b17918
commit 9cadd4c6ec
1 changed files with 19 additions and 39 deletions
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52
pipelined/src/lsu/interlockfsm.sv
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@ -48,26 +48,20 @@ module interlockfsm(
output logic SelHPTW,
output logic IgnoreRequestTLB);
logic ToITLBMiss;
logic ToITLBMissNoReplay;
logic ToDTLBMiss;
logic ToBoth;
logic AnyCPUReqM;
logic PendingTLBMiss;
logic EitherTLBMiss;
logic EitherTLBWrite;
typedef enum logic[2:0] {STATE_T0_READY,
STATE_T1_REPLAY,
STATE_T3_DTLB_MISS,
STATE_T4_ITLB_MISS,
STATE_T5_ITLB_MISS,
STATE_T7_DITLB_MISS} statetype;
STATE_T3_TLB_MISS} statetype;
(* mark_debug = "true" *) statetype InterlockCurrState, InterlockNextState;
assign AnyCPUReqM = (|MemRWM) | (|AtomicM);
assign ToITLBMiss = ITLBMissOrDAFaultF & ~DTLBMissOrDAFaultM & AnyCPUReqM;
assign ToITLBMissNoReplay = ITLBMissOrDAFaultF & ~DTLBMissOrDAFaultM & ~AnyCPUReqM;
assign ToDTLBMiss = ~ITLBMissOrDAFaultF & DTLBMissOrDAFaultM & AnyCPUReqM;
assign ToBoth = ITLBMissOrDAFaultF & DTLBMissOrDAFaultM & AnyCPUReqM;
assign PendingTLBMiss = (ITLBMissOrDAFaultF & ~ITLBWriteF) | (DTLBMissOrDAFaultM & ~DTLBWriteM);
assign EitherTLBMiss = ITLBMissOrDAFaultF | DTLBMissOrDAFaultM;
assign EitherTLBWrite = ITLBWriteF | DTLBWriteM;
always_ff @(posedge clk)
if (reset) InterlockCurrState <= #1 STATE_T0_READY;
@ -75,33 +69,19 @@ module interlockfsm(
always_comb begin
case(InterlockCurrState)
STATE_T0_READY: if (TrapM) InterlockNextState = STATE_T0_READY;
else if(ToDTLBMiss) InterlockNextState = STATE_T3_DTLB_MISS;
else if(ToITLBMissNoReplay) InterlockNextState = STATE_T4_ITLB_MISS;
else if(ToITLBMiss) InterlockNextState = STATE_T5_ITLB_MISS;
else if(ToBoth) InterlockNextState = STATE_T7_DITLB_MISS;
STATE_T0_READY: if(EitherTLBMiss & ~TrapM) InterlockNextState = STATE_T3_TLB_MISS;
else InterlockNextState = STATE_T0_READY;
STATE_T1_REPLAY: if(0) InterlockNextState = STATE_T1_REPLAY;
STATE_T3_TLB_MISS: if(~(EitherTLBWrite)) InterlockNextState = STATE_T3_TLB_MISS;
else if(PendingTLBMiss) InterlockNextState = STATE_T3_TLB_MISS;
else if(AnyCPUReqM) InterlockNextState = STATE_T0_READY;
else InterlockNextState = STATE_T0_READY;
STATE_T3_DTLB_MISS: if(DTLBWriteM) InterlockNextState = STATE_T1_REPLAY;
else InterlockNextState = STATE_T3_DTLB_MISS;
STATE_T4_ITLB_MISS: if(ITLBWriteF) InterlockNextState = STATE_T0_READY;
else InterlockNextState = STATE_T4_ITLB_MISS;
STATE_T5_ITLB_MISS: if(ITLBWriteF) InterlockNextState = STATE_T1_REPLAY;
else InterlockNextState = STATE_T5_ITLB_MISS;
STATE_T7_DITLB_MISS: if(DTLBWriteM) InterlockNextState = STATE_T5_ITLB_MISS;
else InterlockNextState = STATE_T7_DITLB_MISS;
default: InterlockNextState = STATE_T0_READY;
endcase
end // always_comb
assign InterlockStall = (InterlockCurrState == STATE_T0_READY & (DTLBMissOrDAFaultM | ITLBMissOrDAFaultF) & ~TrapM) |
(InterlockCurrState == STATE_T3_DTLB_MISS) | (InterlockCurrState == STATE_T4_ITLB_MISS) |
(InterlockCurrState == STATE_T5_ITLB_MISS) | (InterlockCurrState == STATE_T7_DITLB_MISS);
assign SelReplayMemE = (InterlockCurrState == STATE_T1_REPLAY) |
(InterlockCurrState == STATE_T3_DTLB_MISS & DTLBWriteM) |
(InterlockCurrState == STATE_T5_ITLB_MISS & ITLBWriteF);
assign SelHPTW = (InterlockCurrState == STATE_T3_DTLB_MISS) | (InterlockCurrState == STATE_T4_ITLB_MISS) |
(InterlockCurrState == STATE_T5_ITLB_MISS) | (InterlockCurrState == STATE_T7_DITLB_MISS);
assign IgnoreRequestTLB = (InterlockCurrState == STATE_T0_READY & (ITLBMissOrDAFaultF | DTLBMissOrDAFaultM));
assign InterlockStall = (InterlockCurrState == STATE_T0_READY & EitherTLBMiss & ~TrapM) |
(InterlockCurrState == STATE_T3_TLB_MISS);
assign SelReplayMemE = (InterlockCurrState == STATE_T3_TLB_MISS & EitherTLBWrite & ~PendingTLBMiss);
assign SelHPTW = (InterlockCurrState == STATE_T3_TLB_MISS);
assign IgnoreRequestTLB = (InterlockCurrState == STATE_T0_READY & EitherTLBMiss);
endmodule