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Fixed bug with spill support and Instruction DA Page Faults.

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This commit is contained in:
Ross Thompson 2022-02-23 10:16:12 -06:00
parent 15f6871a8d
commit 19ec874641
2 changed files with 27 additions and 29 deletions
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6
pipelined/src/ifu/ifu.sv
View File

@ -125,8 +125,8 @@ module ifu (
if(`C_SUPPORTED) begin : SpillSupport
spillsupport spillsupport(.clk, .reset, .StallF, .PCF, .PCPlusUpperF, .PCNextF, .InstrRawF,
.IFUCacheBusStallF, .ITLBMissF, .PCNextFSpill, .PCFSpill,
.SelNextSpillF, .PostSpillInstrRawF, .CompressedF);
.InstrDAPageFaultF, .IFUCacheBusStallF, .ITLBMissF, .PCNextFSpill, .PCFSpill,
.SelNextSpillF, .PostSpillInstrRawF, .CompressedF);
end else begin : NoSpillSupport
assign PCNextFSpill = PCNextF;
assign PCFSpill = PCF;
@ -160,7 +160,7 @@ module ifu (
.PMPCFG_ARRAY_REGW, .PMPADDR_ARRAY_REGW);
end else begin
assign {ITLBMissF, InstrAccessFaultF, InstrPageFaultF} = '0;
assign {ITLBMissF, InstrAccessFaultF, InstrPageFaultF, InstrDAPageFaultF} = '0;
assign PCPF = PCFExt[`PA_BITS-1:0];
assign CacheableF = '1;
end

50
pipelined/src/ifu/spillsupport.sv
View File

@ -42,6 +42,7 @@ module spillsupport (
input logic [31:0] InstrRawF,
input logic IFUCacheBusStallF,
input logic ITLBMissF,
input logic InstrDAPageFaultF,
output logic [`XLEN-1:0] PCNextFSpill,
output logic [`XLEN-1:0] PCFSpill,
output logic SelNextSpillF,
@ -50,44 +51,41 @@ module spillsupport (
localparam integer SPILLTHRESHOLD = (`IMEM == `MEM_CACHE) ? `ICACHE_LINELENINBITS/32 : 1;
logic [`XLEN-1:0] PCPlus2F;
logic TakeSpillF;
logic SpillF;
logic SelSpillF, SpillSaveF;
logic [15:0] SpillDataLine0;
logic [`XLEN-1:0] PCPlus2F;
logic TakeSpillF;
logic SpillF;
logic SelSpillF, SpillSaveF;
logic [15:0] SpillDataLine0;
typedef enum logic [1:0] {STATE_READY, STATE_SPILL} statetype;
(* mark_debug = "true" *) statetype CurrState, NextState;
// *** PLACE ALL THIS IN A MODULE
// this exists only if there are compressed instructions.
// reuse PC+2/4 circuitry to avoid needing a second CPA to add 2
mux2 #(`XLEN) pcplus2mux(.d0({PCF[`XLEN-1:2], 2'b10}), .d1({PCPlusUpperF, 2'b00}), .s(PCF[1]), .y(PCPlus2F));
mux2 #(`XLEN) pcnextspillmux(.d0(PCNextF), .d1(PCPlus2F), .s(SelNextSpillF), .y(PCNextFSpill));
mux2 #(`XLEN) pcplus2mux(.d0({PCF[`XLEN-1:2], 2'b10}), .d1({PCPlusUpperF, 2'b00}),
.s(PCF[1]), .y(PCPlus2F));
mux2 #(`XLEN) pcnextspillmux(.d0(PCNextF), .d1(PCPlus2F), .s(SelNextSpillF),
.y(PCNextFSpill));
mux2 #(`XLEN) pcspillmux(.d0(PCF), .d1(PCPlus2F), .s(SelSpillF), .y(PCFSpill));
assign SpillF = &PCF[$clog2(SPILLTHRESHOLD)+1:1];
typedef enum logic [1:0] {STATE_SPILL_READY, STATE_SPILL_SPILL} statetype;
(* mark_debug = "true" *) statetype CurrState, NextState;
assign TakeSpillF = SpillF & ~IFUCacheBusStallF & ~(ITLBMissF | InstrDAPageFaultF);
always_ff @(posedge clk)
if (reset) CurrState <= #1 STATE_SPILL_READY;
if (reset) CurrState <= #1 STATE_READY;
else CurrState <= #1 NextState;
assign TakeSpillF = SpillF & ~IFUCacheBusStallF & ~ITLBMissF;
always_comb begin
case (CurrState)
STATE_SPILL_READY: if (TakeSpillF) NextState = STATE_SPILL_SPILL;
else NextState = STATE_SPILL_READY;
STATE_SPILL_SPILL: if(IFUCacheBusStallF | StallF) NextState = STATE_SPILL_SPILL;
else NextState = STATE_SPILL_READY;
default: NextState = STATE_SPILL_READY;
STATE_READY: if (TakeSpillF) NextState = STATE_SPILL;
else NextState = STATE_READY;
STATE_SPILL: if(IFUCacheBusStallF | StallF) NextState = STATE_SPILL;
else NextState = STATE_READY;
default: NextState = STATE_READY;
endcase
end
assign SelSpillF = (CurrState == STATE_SPILL_SPILL);
assign SelNextSpillF = (CurrState == STATE_SPILL_READY & TakeSpillF) |
(CurrState == STATE_SPILL_SPILL & IFUCacheBusStallF);
assign SpillSaveF = (CurrState == STATE_SPILL_READY) & TakeSpillF;
assign SelSpillF = (CurrState == STATE_SPILL);
assign SelNextSpillF = (CurrState == STATE_READY & TakeSpillF) |
(CurrState == STATE_SPILL & IFUCacheBusStallF);
assign SpillSaveF = (CurrState == STATE_READY) & TakeSpillF;
flopenr #(16) SpillInstrReg(.clk(clk),
.en(SpillSaveF),