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Progress on non dcache mode working.

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This commit is contained in:
Ross Thompson 2021-12-30 15:51:07 -06:00
parent 54d71006b1
commit 89303579ee
3 changed files with 14 additions and 11 deletions
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2
wally-pipelined/src/ifu/ifu.sv
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@ -218,7 +218,7 @@ module ifu (
assign LocalIfuBusAdr = SelUncachedAdr ? PCPFmmu : ICacheBusAdr;
assign IfuBusAdr = ({{`PA_BITS-LOGWPL{1'b0}}, WordCount} << $clog2(`XLEN/8)) + LocalIfuBusAdr;
busfsm #(WordCountThreshold, LOGWPL)
busfsm #(WordCountThreshold, LOGWPL, `MEM_ICACHE)
busfm(.clk, .reset, .IgnoreRequest,
.LsuRWM(2'b10), .DCacheFetchLine(ICacheFetchLine), .DCacheWriteLine(1'b0),
.LsuBusAck(IfuBusAck),

21
wally-pipelined/src/lsu/busfsm.sv
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@ -27,7 +27,7 @@
module busfsm #(parameter integer WordCountThreshold,
parameter integer LOGWPL)
parameter integer LOGWPL, parameter integer CacheEnabled )
(input logic clk,
input logic reset,
@ -55,7 +55,8 @@ module busfsm #(parameter integer WordCountThreshold,
logic CntReset;
logic WordCountFlag;
logic [LOGWPL-1:0] NextWordCount;
logic UnCachedAccess;
typedef enum {STATE_BUS_READY,
STATE_BUS_FETCH,
@ -81,6 +82,8 @@ module busfsm #(parameter integer WordCountThreshold,
assign WordCountFlag = (WordCount == WordCountThreshold[LOGWPL-1:0]);
assign CntEn = PreCntEn & LsuBusAck;
assign UnCachedAccess = ~CacheableM | ~CacheEnabled;
always_ff @(posedge clk)
if (reset) BusCurrState <= #1 STATE_BUS_READY;
else BusCurrState <= #1 BusNextState;
@ -88,8 +91,8 @@ module busfsm #(parameter integer WordCountThreshold,
always_comb begin
case(BusCurrState)
STATE_BUS_READY: if(IgnoreRequest) BusNextState = STATE_BUS_READY;
else if(LsuRWM[0] & (~CacheableM | ~`MEM_DCACHE)) BusNextState = STATE_BUS_UNCACHED_WRITE;
else if(LsuRWM[1] & (~CacheableM | ~`MEM_DCACHE)) BusNextState = STATE_BUS_UNCACHED_READ;
else if(LsuRWM[0] & (UnCachedAccess)) BusNextState = STATE_BUS_UNCACHED_WRITE;
else if(LsuRWM[1] & (UnCachedAccess)) BusNextState = STATE_BUS_UNCACHED_READ;
else if(DCacheFetchLine) BusNextState = STATE_BUS_FETCH;
else if(DCacheWriteLine) BusNextState = STATE_BUS_WRITE;
else BusNextState = STATE_BUS_READY;
@ -113,27 +116,27 @@ module busfsm #(parameter integer WordCountThreshold,
assign CntReset = BusCurrState == STATE_BUS_READY;
assign BusStall = (BusCurrState == STATE_BUS_READY & ~IgnoreRequest & ((~CacheableM & (|LsuRWM)) | DCacheFetchLine | DCacheWriteLine)) |
assign BusStall = (BusCurrState == STATE_BUS_READY & ~IgnoreRequest & ((UnCachedAccess & (|LsuRWM)) | DCacheFetchLine | DCacheWriteLine)) |
(BusCurrState == STATE_BUS_UNCACHED_WRITE) |
(BusCurrState == STATE_BUS_UNCACHED_READ) |
(BusCurrState == STATE_BUS_FETCH) |
(BusCurrState == STATE_BUS_WRITE);
assign PreCntEn = BusCurrState == STATE_BUS_FETCH | BusCurrState == STATE_BUS_WRITE;
assign UnCachedLsuBusWrite = (BusCurrState == STATE_BUS_READY & ~CacheableM & (LsuRWM[0])) |
assign UnCachedLsuBusWrite = (BusCurrState == STATE_BUS_READY & UnCachedAccess & (LsuRWM[0])) |
(BusCurrState == STATE_BUS_UNCACHED_WRITE);
assign LsuBusWrite = UnCachedLsuBusWrite | (BusCurrState == STATE_BUS_WRITE);
assign UnCachedLsuBusRead = (BusCurrState == STATE_BUS_READY & ~CacheableM & (|LsuRWM[1])) |
assign UnCachedLsuBusRead = (BusCurrState == STATE_BUS_READY & UnCachedAccess & (|LsuRWM[1])) |
(BusCurrState == STATE_BUS_UNCACHED_READ);
assign LsuBusRead = UnCachedLsuBusRead | (BusCurrState == STATE_BUS_FETCH) | (BusCurrState == STATE_BUS_READY & DCacheFetchLine);
assign DCacheBusAck = (BusCurrState == STATE_BUS_FETCH & WordCountFlag & LsuBusAck) |
(BusCurrState == STATE_BUS_WRITE & WordCountFlag & LsuBusAck);
assign BusCommittedM = BusCurrState != STATE_BUS_READY;
assign SelUncachedAdr = (BusCurrState == STATE_BUS_READY & (|LsuRWM & ~CacheableM)) |
assign SelUncachedAdr = (BusCurrState == STATE_BUS_READY & (|LsuRWM & UnCachedAccess)) |
(BusCurrState == STATE_BUS_UNCACHED_READ |
BusCurrState == STATE_BUS_UNCACHED_READ_DONE |
BusCurrState == STATE_BUS_UNCACHED_WRITE |
BusCurrState == STATE_BUS_UNCACHED_WRITE_DONE) |
~`MEM_DCACHE; // if no dcache always select uncachedadr.
~CacheEnabled; // if no dcache always select uncachedadr.
endmodule

2
wally-pipelined/src/lsu/lsu.sv
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@ -384,7 +384,7 @@ module lsu
else assign LsuBusSize = SelUncachedAdr ? LsuFunct3M : 3'b011;
endgenerate;
busfsm #(WordCountThreshold, LOGWPL)
busfsm #(WordCountThreshold, LOGWPL, `MEM_DCACHE)
busfsm(.clk, .reset, .IgnoreRequest, .LsuRWM, .DCacheFetchLine, .DCacheWriteLine,
.LsuBusAck, .CPUBusy, .CacheableM, .BusStall, .LsuBusWrite, .LsuBusRead,
.DCacheBusAck, .BusCommittedM, .SelUncachedAdr, .WordCount);