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code cleanup

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This commit is contained in:
David Harris 2023-01-07 04:49:25 -08:00
parent 31bffc305b
commit 6763f51b3c
1 changed files with 4 additions and 6 deletions
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pipelined/src/mmu/mmu.sv
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@ -134,11 +134,13 @@ module mmu #(parameter TLB_ENTRIES = 8, // number of TLB Entries
.ExecuteAccessF, .WriteAccessM, .ReadAccessM, .ExecuteAccessF, .WriteAccessM, .ReadAccessM,
.PMPInstrAccessFaultF, .PMPLoadAccessFaultM, .PMPStoreAmoAccessFaultM); .PMPInstrAccessFaultF, .PMPLoadAccessFaultM, .PMPStoreAmoAccessFaultM);
// Access faults
// If TLB miss and translating we want to not have faults from the PMA and PMP checkers. // If TLB miss and translating we want to not have faults from the PMA and PMP checkers.
assign InstrAccessFaultF = (PMAInstrAccessFaultF | PMPInstrAccessFaultF) & ~(Translate & ~TLBHit); assign InstrAccessFaultF = (PMAInstrAccessFaultF | PMPInstrAccessFaultF) & ~(Translate & ~TLBHit);
assign LoadAccessFaultM = (PMALoadAccessFaultM | PMPLoadAccessFaultM) & ~(Translate & ~TLBHit); assign LoadAccessFaultM = (PMALoadAccessFaultM | PMPLoadAccessFaultM) & ~(Translate & ~TLBHit);
assign StoreAmoAccessFaultM = (PMAStoreAmoAccessFaultM | PMPStoreAmoAccessFaultM) & ~(Translate & ~TLBHit); assign StoreAmoAccessFaultM = (PMAStoreAmoAccessFaultM | PMPStoreAmoAccessFaultM) & ~(Translate & ~TLBHit);
// Misaligned faults
always_comb always_comb
case(Size[1:0]) case(Size[1:0])
2'b00: DataMisalignedM = 0; // lb, sb, lbu 2'b00: DataMisalignedM = 0; // lb, sb, lbu
@ -146,15 +148,11 @@ module mmu #(parameter TLB_ENTRIES = 8, // number of TLB Entries
2'b10: DataMisalignedM = VAdr[1] | VAdr[0]; // lw, sw, flw, fsw, lwu 2'b10: DataMisalignedM = VAdr[1] | VAdr[0]; // lw, sw, flw, fsw, lwu
2'b11: DataMisalignedM = |VAdr[2:0]; // ld, sd, fld, fsd 2'b11: DataMisalignedM = |VAdr[2:0]; // ld, sd, fld, fsd
endcase endcase
// If the CPU's (not HPTW's) request is a page fault.
assign LoadMisalignedFaultM = DataMisalignedM & ReadAccessM; assign LoadMisalignedFaultM = DataMisalignedM & ReadAccessM;
assign StoreAmoMisalignedFaultM = DataMisalignedM & (WriteAccessM | AtomicAccessM); assign StoreAmoMisalignedFaultM = DataMisalignedM & (WriteAccessM | AtomicAccessM);
// Specify which type of page fault is occurring // Specify which type of page fault is occurring
assign InstrPageFaultF = TLBPageFault & ExecuteAccessF; assign InstrPageFaultF = TLBPageFault & ExecuteAccessF;
assign LoadPageFaultM = TLBPageFault & ReadAccessM; assign LoadPageFaultM = TLBPageFault & ReadAccessM;
assign StoreAmoPageFaultM = TLBPageFault & (WriteAccessM | AtomicAccessM); assign StoreAmoPageFaultM = TLBPageFault & (WriteAccessM | AtomicAccessM);
endmodule endmodule