forked from Github_Repos/cvw
Cleanup busdp.
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@ -82,21 +82,16 @@ module busdp #(parameter WORDSPERLINE, parameter LINELEN)
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.d(LSUBusHRDATA), .q(DCacheMemWriteData[(index+1)*`XLEN-1:index*`XLEN]));
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end
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assign LocalLSUBusAdr = SelUncachedAdr ? LSUPAdrM : DCacheBusAdr ;
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mux2 #(`PA_BITS) localadrmux(DCacheBusAdr, LSUPAdrM, SelUncachedAdr, LocalLSUBusAdr);
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assign LSUBusAdr = ({{`PA_BITS-LOGWPL{1'b0}}, WordCount} << $clog2(`XLEN/8)) + LocalLSUBusAdr;
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assign PreLSUBusHWDATA = ReadDataLineSetsM[WordCount]; // only in lsu, not ifu
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// exclude the subword write for uncached. We don't read the data first so we cannot
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// select the subword by masking. Subword write also exists inside the uncore to
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// suport subword masking for i/o. I'm not sure if this is necessary.
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assign LSUBusHWDATA = SelUncachedAdr ? FinalAMOWriteDataM : PreLSUBusHWDATA; // only in lsu, not ifu
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assign LSUBusSize = SelUncachedAdr ? LSUFunct3M : (`XLEN == 32 ? 3'b010 : 3'b011); // ifu: always the XLEN value.
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// select between dcache and direct from the BUS. Always selected if no dcache.
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mux2 #(`XLEN) UnCachedDataMux(.d0(ReadDataWordM),
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.d1(DCacheMemWriteData[`XLEN-1:0]),
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.s(SelUncachedAdr),
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.y(ReadDataWordMuxM));
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mux2 #(`XLEN) lsubushwdatamux(.d0(PreLSUBusHWDATA), .d1(FinalAMOWriteDataM),
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.s(SelUncachedAdr), .y(LSUBusHWDATA));
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mux2 #(3) lsubussizemux(.d0(`XLEN == 32 ? 3'b010 : 3'b011), .d1(LSUFunct3M),
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.s(SelUncachedAdr), .y(LSUBusSize));
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mux2 #(`XLEN) UnCachedDataMux(.d0(ReadDataWordM), .d1(DCacheMemWriteData[`XLEN-1:0]),
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.s(SelUncachedAdr), .y(ReadDataWordMuxM));
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busfsm #(WordCountThreshold, LOGWPL, `MEM_DCACHE)
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busfsm(.clk, .reset, .IgnoreRequest, .LSURWM, .DCacheFetchLine, .DCacheWriteLine,
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@ -89,7 +89,7 @@ module lsu (
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logic [2:0] LSUFunct3M;
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logic [6:0] LSUFunct7M;
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logic [1:0] LSUAtomicM;
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(* mark_debug = "true" *) logic [`PA_BITS-1:0] PreLSUPAdrM, LocalLSUBusAdr;
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(* mark_debug = "true" *) logic [`PA_BITS-1:0] PreLSUPAdrM;
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logic [11:0] PreLSUAdrE, LSUAdrE;
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logic CPUBusy;
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logic DCacheStallM;
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@ -100,12 +100,12 @@ module lsu (
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logic IgnoreRequest;
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logic BusCommittedM, DCacheCommittedM;
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////////////////////////////////////////////////////////////////////////////////////////////////
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flopenrc #(`XLEN) AddressMReg(clk, reset, FlushM, ~StallM, IEUAdrE, IEUAdrM);
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/////////////////////////////////////////////////////////////////////////////////////////////
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// HPTW and Interlock FSM (only needed if VM supported)
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// MMU include PMP and is needed if any privileged supported
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////////////////////////////////////////////////////////////////////////////////////////////////
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flopenrc #(`XLEN) AddressMReg(clk, reset, FlushM, ~StallM, IEUAdrE, IEUAdrM);
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/////////////////////////////////////////////////////////////////////////////////////////////
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logic [`XLEN+1:0] IEUAdrExtM;
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assign IEUAdrExtM = {2'b00, IEUAdrM};
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@ -118,8 +118,7 @@ module lsu (
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.LSUAdrE, .PreLSUPAdrM, .CPUBusy, .InterlockStall, .SelHPTW,
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.IgnoreRequest);
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end // if (`MEM_VIRTMEM)
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else begin
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end else begin
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assign {InterlockStall, SelHPTW, PTE, PageType, DTLBWriteM, ITLBWriteF} = '0;
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assign IgnoreRequest = TrapM;
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assign CPUBusy = StallW;
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@ -168,10 +167,10 @@ module lsu (
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end
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assign LSUStallM = DCacheStallM | InterlockStall | BusStall;
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////////////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////////
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// Hart Memory System
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// Either Data Cache or Data Tightly Integrated Memory or just bus interface
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////////////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////////
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localparam integer WORDSPERLINE = `MEM_DCACHE ? `DCACHE_LINELENINBITS/`XLEN : 1;
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localparam integer LINELEN = `MEM_DCACHE ? `DCACHE_LINELENINBITS : `XLEN;
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@ -207,13 +206,14 @@ module lsu (
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cache #(.LINELEN(`DCACHE_LINELENINBITS), .NUMLINES(`DCACHE_WAYSIZEINBYTES*8/LINELEN),
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.NUMWAYS(`DCACHE_NUMWAYS), .DCACHE(1))
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dcache(.clk, .reset, .CPUBusy,
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.RW(CacheableM ? LSURWM : 2'b00), .FlushCache(FlushDCacheM), .Atomic(CacheableM ? LSUAtomicM : 2'b00),
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.NextAdr(LSUAdrE), .PAdr(LSUPAdrM),
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.FinalWriteData(FinalWriteDataM), .ReadDataWord(ReadDataWordM), .CacheStall(DCacheStallM),
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.CacheMiss(DCacheMiss), .CacheAccess(DCacheAccess),
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.IgnoreRequest, .CacheCommitted(DCacheCommittedM),
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.CacheBusAdr(DCacheBusAdr), .ReadDataLineSets(ReadDataLineSetsM), .CacheMemWriteData(DCacheMemWriteData),
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.CacheFetchLine(DCacheFetchLine), .CacheWriteLine(DCacheWriteLine), .CacheBusAck(DCacheBusAck), .InvalidateCacheM(1'b0));
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.RW(CacheableM ? LSURWM : 2'b00), .FlushCache(FlushDCacheM),
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.Atomic(CacheableM ? LSUAtomicM : 2'b00), .NextAdr(LSUAdrE), .PAdr(LSUPAdrM),
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.FinalWriteData(FinalWriteDataM), .ReadDataWord(ReadDataWordM),
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.CacheStall(DCacheStallM), .CacheMiss(DCacheMiss), .CacheAccess(DCacheAccess),
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.IgnoreRequest, .CacheCommitted(DCacheCommittedM), .CacheBusAdr(DCacheBusAdr),
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.ReadDataLineSets(ReadDataLineSetsM), .CacheMemWriteData(DCacheMemWriteData),
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.CacheFetchLine(DCacheFetchLine), .CacheWriteLine(DCacheWriteLine),
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.CacheBusAck(DCacheBusAck), .InvalidateCacheM(1'b0));
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end else begin : passthrough
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assign {ReadDataWordM, DCacheStallM, DCacheCommittedM, DCacheWriteLine, DCacheFetchLine, DCacheBusAdr} = '0;
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@ -237,19 +237,16 @@ module lsu (
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.HWDATAIN(FinalAMOWriteDataM),
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.HWDATA(FinalWriteDataM));
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////////////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////////
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// Atomic operations
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////////////////////////////////////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////////////////////////////////
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if (`A_SUPPORTED) begin:lrsc
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/*atomic atomic(.clk, .reset, .FlushW, .CPUBusy, .MemRead, .PreLSURWM, .LSUAtomicM, .LSUPAdrM,
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.SquashSCM, .LSURWM, ... ); *** */
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atomic atomic(.clk, .reset, .FlushW, .CPUBusy, .ReadDataM, .WriteDataM, .LSUPAdrM, .LSUFunct7M,
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.LSUFunct3M, .LSUAtomicM, .PreLSURWM, .IgnoreRequest, .DTLBMissM,
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.FinalAMOWriteDataM, .SquashSCW, .LSURWM);
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atomic atomic(.clk, .reset, .FlushW, .CPUBusy, .ReadDataM, .WriteDataM, .LSUPAdrM,
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.LSUFunct7M, .LSUFunct3M, .LSUAtomicM, .PreLSURWM, .IgnoreRequest,
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.DTLBMissM, .FinalAMOWriteDataM, .SquashSCW, .LSURWM);
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end else begin:lrsc
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assign SquashSCW = 0; assign LSURWM = PreLSURWM; assign FinalAMOWriteDataM = WriteDataM;
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end
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endmodule
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