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Optimization. Able to remove hptw address muxes from the E stage.

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This commit is contained in:
Ross Thompson 2022-09-08 15:51:18 -05:00
parent 0904951a8c
commit 7f1ae039b0
4 changed files with 15 additions and 16 deletions
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3
pipelined/src/cache/cache.sv vendored
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@ -52,6 +52,7 @@ module cache #(parameter LINELEN, NUMLINES, NUMWAYS, LOGBWPL, WORDLEN, MUXINTE
input logic IgnoreRequestTLB,
input logic TrapM,
input logic Cacheable,
input logic SelReplay,
// Bus fsm interface
output logic CacheFetchLine,
output logic CacheWriteLine,
@ -123,7 +124,7 @@ module cache #(parameter LINELEN, NUMLINES, NUMWAYS, LOGBWPL, WORDLEN, MUXINTE
// and FlushAdr when handling D$ flushes
mux3 #(SETLEN) AdrSelMux(
.d0(NextAdr[SETTOP-1:OFFSETLEN]), .d1(PAdr[SETTOP-1:OFFSETLEN]), .d2(FlushAdr),
.s({SelFlush, SelAdr}), .y(RAdr));
.s({SelFlush, (SelAdr | SelReplay)}), .y(RAdr));
// Array of cache ways, along with victim, hit, dirty, and read merging logic
cacheway #(NUMLINES, LINELEN, TAGLEN, OFFSETLEN, SETLEN)

1
pipelined/src/ifu/ifu.sv
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@ -222,6 +222,7 @@ module ifu (
.CacheFetchLine(ICacheFetchLine),
.CacheWriteLine(), .ReadDataWord(FinalInstrRawF),
.Cacheable(CacheableF),
.SelReplay('0),
.CacheMiss(ICacheMiss), .CacheAccess(ICacheAccess),
.ByteMask('0), .WordCount('0), .SelBusWord('0),
.FinalWriteData('0),

15
pipelined/src/lsu/lsu.sv
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@ -104,7 +104,6 @@ module lsu (
logic [6:0] LSUFunct7M;
logic [1:0] LSUAtomicM;
(* mark_debug = "true" *) logic [`XLEN+1:0] PreLSUPAdrM;
logic [11:0] LSUAdrE;
logic SelDTIM;
logic CPUBusy;
logic DCacheStallM;
@ -118,7 +117,8 @@ module lsu (
logic [`LLEN-1:0] IMAFWriteDataM;
logic [`LLEN-1:0] ReadDataM;
logic [(`LLEN-1)/8:0] ByteMaskM;
logic SelReplay;
flopenrc #(`XLEN) AddressMReg(clk, reset, FlushM, ~StallM, IEUAdrE, IEUAdrM);
assign IEUAdrExtM = {2'b00, IEUAdrM};
assign IEUAdrExtE = {2'b00, IEUAdrE};
@ -131,17 +131,16 @@ module lsu (
if(`VIRTMEM_SUPPORTED) begin : VIRTMEM_SUPPORTED
lsuvirtmem lsuvirtmem(.clk, .reset, .StallW, .MemRWM(NonDTIMMemRWM), .AtomicM, .ITLBMissF, .ITLBWriteF,
.DTLBMissM, .DTLBWriteM, .InstrDAPageFaultF, .DataDAPageFaultM,
.DTLBMissM, .DTLBWriteM, .InstrDAPageFaultF, .DataDAPageFaultM, .SelReplay,
.TrapM, .DCacheStallM, .SATP_REGW, .PCF,
.STATUS_MXR, .STATUS_SUM, .STATUS_MPRV, .STATUS_MPP, .PrivilegeModeW,
.ReadDataM(ReadDataM[`XLEN-1:0]), .WriteDataM, .Funct3M, .LSUFunct3M, .Funct7M, .LSUFunct7M,
.IEUAdrExtM, .PTE, .IMWriteDataM, .PageType, .PreLSURWM, .LSUAtomicM, .IEUAdrE,
.LSUAdrE, .PreLSUPAdrM, .CPUBusy, .InterlockStall, .SelHPTW,
.IEUAdrExtM, .PTE, .IMWriteDataM, .PageType, .PreLSURWM, .LSUAtomicM,
.PreLSUPAdrM, .CPUBusy, .InterlockStall, .SelHPTW,
.IgnoreRequestTLB);
end else begin
assign {InterlockStall, SelHPTW, PTE, PageType, DTLBWriteM, ITLBWriteF, IgnoreRequestTLB} = '0;
assign CPUBusy = StallW; assign PreLSURWM = NonDTIMMemRWM;
assign LSUAdrE = IEUAdrE[11:0];
assign PreLSUPAdrM = IEUAdrExtM;
assign LSUFunct3M = Funct3M; assign LSUFunct7M = Funct7M; assign LSUAtomicM = AtomicM;
assign IMWriteDataM = WriteDataM;
@ -251,9 +250,9 @@ module lsu (
cache #(.LINELEN(`DCACHE_LINELENINBITS), .NUMLINES(`DCACHE_WAYSIZEINBYTES*8/LINELEN),
.NUMWAYS(`DCACHE_NUMWAYS), .LOGBWPL(LOGBWPL), .WORDLEN(`LLEN), .MUXINTERVAL(`XLEN), .DCACHE(1)) dcache(
.clk, .reset, .CPUBusy, .SelBusWord, .RW(LSURWM), .Atomic(LSUAtomicM),
.FlushCache(FlushDCacheM), .NextAdr(LSUAdrE), .PAdr(LSUPAdrM),
.FlushCache(FlushDCacheM), .NextAdr(IEUAdrE[11:0]), .PAdr(LSUPAdrM),
.ByteMask(ByteMaskM), .WordCount,
.FinalWriteData(LSUWriteDataM), .Cacheable(CacheableM),
.FinalWriteData(LSUWriteDataM), .Cacheable(CacheableM), .SelReplay,
.CacheStall(DCacheStallM), .CacheMiss(DCacheMiss), .CacheAccess(DCacheAccess),
.IgnoreRequestTLB, .TrapM, .CacheCommitted(DCacheCommittedM),
.CacheBusAdr(DCacheBusAdr), .ReadDataWord(ReadDataWordM),

12
pipelined/src/lsu/lsuvirtmen.sv
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@ -38,6 +38,7 @@ module lsuvirtmem(
input logic DTLBMissM,
output logic DTLBWriteM,
input logic InstrDAPageFaultF,
output logic SelReplay,
input logic DataDAPageFaultM,
input logic TrapM,
input logic DCacheStallM,
@ -52,13 +53,11 @@ module lsuvirtmem(
output logic [2:0] LSUFunct3M,
input logic [6:0] Funct7M,
output logic [6:0] LSUFunct7M,
input logic [`XLEN-1:0] IEUAdrE,
output logic [`XLEN-1:0] PTE,
output logic [`XLEN-1:0] IMWriteDataM,
output logic [1:0] PageType,
output logic [1:0] PreLSURWM,
output logic [1:0] LSUAtomicM,
output logic [11:0] LSUAdrE,
output logic [`XLEN+1:0] PreLSUPAdrM,
input logic [`XLEN+1:0] IEUAdrExtM, // *** can move internally.
@ -74,7 +73,6 @@ module lsuvirtmem(
logic [1:0] HPTWRW;
logic [2:0] HPTWSize;
logic SelReplayMemE;
logic [11:0] PreLSUAdrE;
logic ITLBMissOrDAFaultF, ITLBMissOrDAFaultNoTrapF;
logic DTLBMissOrDAFaultM, DTLBMissOrDAFaultNoTrapM;
logic SelHPTWAdr;
@ -97,8 +95,10 @@ module lsuvirtmem(
// Once the walk is done and it is time to update the DTLB we need to switch back
// to the orignal data virtual address.
assign SelHPTWAdr = SelHPTW & ~DTLBWriteM;
assign SelHPTWAdr = SelHPTW & ~(DTLBWriteM | ITLBWriteF);
assign SelReplay = SelHPTWAdr | SelReplayMemE;
// multiplex the outputs to LSU
if(`XLEN+2-`PA_BITS > 0) begin
logic [(`XLEN+2-`PA_BITS)-1:0] zeros;
@ -109,12 +109,10 @@ module lsuvirtmem(
mux2 #(3) sizemux(Funct3M, HPTWSize, SelHPTW, LSUFunct3M);
mux2 #(7) funct7mux(Funct7M, 7'b0, SelHPTW, LSUFunct7M);
mux2 #(2) atomicmux(AtomicM, 2'b00, SelHPTW, LSUAtomicM);
mux2 #(12) adremux(IEUAdrE[11:0], HPTWAdr[11:0], SelHPTW, PreLSUAdrE);
mux2 #(`XLEN+2) lsupadrmux(IEUAdrExtM, HPTWAdrExt, SelHPTWAdr, PreLSUPAdrM);
if(`HPTW_WRITES_SUPPORTED)
mux2 #(`XLEN) lsuwritedatamux(WriteDataM, PTE, SelHPTW, IMWriteDataM);
else assign IMWriteDataM = WriteDataM;
mux2 #(12) replaymux(PreLSUAdrE, IEUAdrExtM[11:0], SelReplayMemE, LSUAdrE); // replay cpu request after hptw. *** redudant with mux in cache.
// always block interrupts when using the hardware page table walker.
assign CPUBusy = StallW & ~SelHPTW;