Moved mux into lsuvirtmem.

pipelined/src/lsu/atomic.sv

@@ -34,7 +34,7 @@ module atomic (
   input logic                clk,
   input logic                reset, FlushW, CPUBusy,
   input logic [`XLEN-1:0]    ReadDataM,
-  input logic [`XLEN-1:0]    WriteDataM, 
+  input logic [`XLEN-1:0]    LSUWriteDataM, 
   input logic [`PA_BITS-1:0] LSUPAdrM,
   input logic [6:0]          LSUFunct7M,
   input logic [2:0]          LSUFunct3M,
@@ -49,9 +49,9 @@ module atomic (
     logic [`XLEN-1:0] AMOResult;
   logic               MemReadM;
 
-    amoalu amoalu(.srca(ReadDataM), .srcb(WriteDataM), .funct(LSUFunct7M), .width(LSUFunct3M[1:0]), 
+    amoalu amoalu(.srca(ReadDataM), .srcb(LSUWriteDataM), .funct(LSUFunct7M), .width(LSUFunct3M[1:0]), 
                   .result(AMOResult));
-    mux2 #(`XLEN) wdmux(WriteDataM, AMOResult, LSUAtomicM[1], FinalAMOWriteDataM);
+    mux2 #(`XLEN) wdmux(LSUWriteDataM, AMOResult, LSUAtomicM[1], FinalAMOWriteDataM);
     assign MemReadM = PreLSURWM[1] & ~(IgnoreRequest) & ~DTLBMissM;
     lrsc lrsc(.clk, .reset, .FlushW, .CPUBusy, .MemReadM, .PreLSURWM, .LSUAtomicM, .LSUPAdrM,
         .SquashSCW, .LSURWM);

pipelined/src/lsu/lsu.sv

@@ -103,6 +103,7 @@ module lsu (
   logic                     BusCommittedM, DCacheCommittedM;
   logic                     LSUBusWriteCrit;
   logic                     DataDAPageFaultM;
+  logic [`XLEN-1:0]         LSUWriteDataM;
     
   flopenrc #(`XLEN) AddressMReg(clk, reset, FlushM, ~StallM, IEUAdrE, IEUAdrM);
   assign IEUAdrExtM = {2'b00, IEUAdrM}; 
@@ -118,8 +119,8 @@ module lsu (
                           .DTLBMissM, .DTLBWriteM, .InstrDAPageFaultF, .DataDAPageFaultM, 
                           .TrapM, .DCacheStallM, .SATP_REGW, .PCF,
                           .STATUS_MXR, .STATUS_SUM, .STATUS_MPRV, .STATUS_MPP, .PrivilegeModeW,
-                          .ReadDataM, .Funct3M, .LSUFunct3M, .Funct7M, .LSUFunct7M, .IEUAdrM,
+                          .ReadDataM, .WriteDataM, .Funct3M, .LSUFunct3M, .Funct7M, .LSUFunct7M, .IEUAdrM,
-                          .IEUAdrExtM, .PTE, .PageType, .PreLSURWM, .LSUAtomicM, .IEUAdrE,
+                          .IEUAdrExtM, .PTE, .LSUWriteDataM, .PageType, .PreLSURWM, .LSUAtomicM, .IEUAdrE,
                           .LSUAdrE, .PreLSUPAdrM, .CPUBusy, .InterlockStall, .SelHPTW,
                           .IgnoreRequestTLB, .IgnoreRequestTrapM);
 
@@ -129,6 +130,7 @@ module lsu (
     assign LSUAdrE = PreLSUAdrE; assign PreLSUAdrE = IEUAdrE[11:0]; 
     assign PreLSUPAdrM = IEUAdrExtM[`PA_BITS-1:0];
     assign LSUFunct3M = Funct3M;  assign LSUFunct7M = Funct7M; assign LSUAtomicM = AtomicM;
+    assign LSUWriteDataM = WriteDataM;
    end
 
   // CommittedM tells the CPU's privilege unit the current instruction
@@ -176,7 +178,7 @@ module lsu (
   //  Memory System
   //  Either Data Cache or Data Tightly Integrated Memory or just bus interface
   /////////////////////////////////////////////////////////////////////////////////////////////
-  logic [`XLEN-1:0]    FinalAMOWriteDataM, FinalWriteDataM, PostSWWWriteDataM;
+  logic [`XLEN-1:0]    FinalAMOWriteDataM, FinalWriteDataM;
   logic [`XLEN-1:0]    ReadDataWordM;
   logic [`XLEN-1:0]    ReadDataWordMuxM;
   logic                IgnoreRequest;
@@ -252,26 +254,23 @@ module lsu (
     assign ReadDataWordMaskedM = SelUncachedAdr ? '0 : ReadDataWordM; // AND-gate
     subwordwrite subwordwrite(.HRDATA(ReadDataWordMaskedM), .HADDRD(LSUPAdrM[2:0]),
       .HSIZED({LSUFunct3M[2], 1'b0, LSUFunct3M[1:0]}),
-         .HWDATAIN(FinalAMOWriteDataM), .HWDATA(PostSWWWriteDataM));
+         .HWDATAIN(FinalAMOWriteDataM), .HWDATA(FinalWriteDataM));
   end else 
-    assign PostSWWWriteDataM = FinalAMOWriteDataM;
+    assign FinalWriteDataM = FinalAMOWriteDataM;
 
   subwordread subwordread(.ReadDataWordMuxM, .LSUPAdrM(LSUPAdrM[2:0]),
 		.Funct3M(LSUFunct3M), .ReadDataM);
 
-
-  assign FinalWriteDataM = SelHPTW ? PTE : PostSWWWriteDataM;
-
   /////////////////////////////////////////////////////////////////////////////////////////////
   // Atomic operations
   /////////////////////////////////////////////////////////////////////////////////////////////
 
   // *** why does this need DTLBMissM?
   if (`A_SUPPORTED) begin:atomic
-    atomic atomic(.clk, .reset, .FlushW, .CPUBusy, .ReadDataM, .WriteDataM, .LSUPAdrM, 
+    atomic atomic(.clk, .reset, .FlushW, .CPUBusy, .ReadDataM, .LSUWriteDataM, .LSUPAdrM, 
       .LSUFunct7M, .LSUFunct3M, .LSUAtomicM, .PreLSURWM, .IgnoreRequest, 
       .DTLBMissM, .FinalAMOWriteDataM, .SquashSCW, .LSURWM);
   end else begin:lrsc
-    assign SquashSCW = 0; assign LSURWM = PreLSURWM; assign FinalAMOWriteDataM = WriteDataM;
+    assign SquashSCW = 0; assign LSURWM = PreLSURWM; assign FinalAMOWriteDataM = LSUWriteDataM;
   end
 endmodule

pipelined/src/lsu/lsuvirtmen.sv

@@ -47,6 +47,7 @@ module lsuvirtmem(
   input logic [1:0]           PrivilegeModeW,
   input logic [`XLEN-1:0]     PCF,
   input logic [`XLEN-1:0]     ReadDataM,
+  input logic [`XLEN-1:0]     WriteDataM,
   input logic [2:0]           Funct3M,
   output logic [2:0]          LSUFunct3M,
   input logic [6:0]           Funct7M,
@@ -54,6 +55,7 @@ module lsuvirtmem(
   input logic [`XLEN-1:0]     IEUAdrE,
   input logic [`XLEN-1:0]     IEUAdrM,
   output logic [`XLEN-1:0]    PTE,
+  output logic [`XLEN-1:0]    LSUWriteDataM,
   output logic [1:0]          PageType,
   output logic [1:0]          PreLSURWM,
   output logic [1:0]          LSUAtomicM,
@@ -100,6 +102,7 @@ module lsuvirtmem(
   mux2 #(12) adremux(IEUAdrE[11:0], HPTWAdr[11:0], SelHPTW, PreLSUAdrE);
   mux2 #(12) replaymux(PreLSUAdrE, IEUAdrM[11:0], SelReplayCPURequest, LSUAdrE); // replay cpu request after hptw.
   mux2 #(`PA_BITS) lsupadrmux(IEUAdrExtM[`PA_BITS-1:0], HPTWAdr, SelHPTW, PreLSUPAdrM);
+  mux2 #(`XLEN) lsuwritedatamux(WriteDataM, PTE, SelHPTW, LSUWriteDataM);
 
   // always block interrupts when using the hardware page table walker.
   assign CPUBusy = StallW & ~SelHPTW;