diff --git a/src/mmu/mmu.sv b/src/mmu/mmu.sv index 728b6b80b..e3cd8031e 100644 --- a/src/mmu/mmu.sv +++ b/src/mmu/mmu.sv @@ -70,6 +70,7 @@ module mmu #(parameter TLB_ENTRIES = 8, IMMU = 0) ( logic Translate; // Translation occurs when virtual memory is active and DisableTranslation is off logic TLBHit; // Hit in TLB logic TLBPageFault; // Page fault from TLB + logic ReadNoAmoAccessM; // Read that is not part of atomic operation causes Load faults. Otherwise StoreAmo faults // only instantiate TLB if Virtual Memory is supported if (`VIRTMEM_SUPPORTED) begin:tlb @@ -118,6 +119,8 @@ module mmu #(parameter TLB_ENTRIES = 8, IMMU = 0) ( assign PMPLoadAccessFaultM = 0; end + assign ReadNoAmoAccessM = ReadAccessM & ~WriteAccessM;// AMO causes StoreAmo rather than Load fault + // Access faults // If TLB miss and translating we want to not have faults from the PMA and PMP checkers. assign InstrAccessFaultF = (PMAInstrAccessFaultF | PMPInstrAccessFaultF) & ~TLBMiss; @@ -132,11 +135,11 @@ module mmu #(parameter TLB_ENTRIES = 8, IMMU = 0) ( 2'b10: DataMisalignedM = VAdr[1] | VAdr[0]; // lw, sw, flw, fsw, lwu 2'b11: DataMisalignedM = |VAdr[2:0]; // ld, sd, fld, fsd endcase - assign LoadMisalignedFaultM = DataMisalignedM & ReadAccessM; - assign StoreAmoMisalignedFaultM = DataMisalignedM & (WriteAccessM | AtomicAccessM); + assign LoadMisalignedFaultM = DataMisalignedM & ReadNoAmoAccessM; + assign StoreAmoMisalignedFaultM = DataMisalignedM & WriteAccessM; // Specify which type of page fault is occurring assign InstrPageFaultF = TLBPageFault & ExecuteAccessF; - assign LoadPageFaultM = TLBPageFault & ReadAccessM; - assign StoreAmoPageFaultM = TLBPageFault & (WriteAccessM | AtomicAccessM); + assign LoadPageFaultM = TLBPageFault & ReadNoAmoAccessM; + assign StoreAmoPageFaultM = TLBPageFault & WriteAccessM; endmodule