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ppcmmu: Ignore dcbz for MMIO regions#203

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dingusdev merged 1 commit into from
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ppcmmu: Ignore dcbz for MMIO regions #203

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43 changes: 43 additions & 0 deletions cpu/ppc/ppcmmu.cpp
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Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -864,6 +864,49 @@ static inline TLBEntry* lookup_secondary_tlb(uint32_t guest_va, uint32_t tag) {
return tlb_entry;
}

void mmu_dcbz(uint32_t opcode, uint32_t guest_va)
{
const uint32_t tag = guest_va & ~0xFFFUL;
// look up guest virtual address in the primary TLB
TLBEntry *tlb_entry = &pCurDTLB1[(guest_va >> PPC_PAGE_SIZE_BITS) & tlb_size_mask];

if (!tlb_entry->matches_tag(tag)) {
// primary TLB miss -> look up address in the secondary TLB
tlb_entry = lookup_secondary_tlb<TLBType::DTLB>(guest_va, tag);
if (tlb_entry == nullptr) {
// secondary TLB miss ->
// perform full address translation and refill the secondary TLB
tlb_entry = dtlb2_refill(guest_va, 1);
}
}

// Check if this was in a MMIO region, in which case we avoid doing the
// write, so that this intermediate state is not visible to the device
// (usually a dcbz is done to prepare a cache line as a write buffer, and
// the real values are written later).
if (tlb_entry->flags & TLBFlags::PAGE_IO) {
// Still do the same checks that mmu_write_vmem would have done to
// disallow writes to read-only regions.
if (!(tlb_entry->flags & TLBFlags::PAGE_WRITABLE)) {
ppc_state.spr[SPR::DSISR] = 0x08000000 | (1 << 25);
ppc_state.spr[SPR::DAR] = guest_va;
mmu_exception_handler(Except_Type::EXC_DSI, 0);
}
if (!(tlb_entry->flags & TLBFlags::PTE_SET_C)) {
page_address_translation(guest_va, false, !!(ppc_state.msr & MSR::PR), true);
tlb_entry->flags |= TLBFlags::PTE_SET_C;
}
return;
}

// the following is not especially efficient but necessary
// to make BlockZero under Mac OS 8.x and later to work
mmu_write_vmem<uint64_t>(opcode, guest_va + 0, 0);
mmu_write_vmem<uint64_t>(opcode, guest_va + 8, 0);
mmu_write_vmem<uint64_t>(opcode, guest_va + 16, 0);
mmu_write_vmem<uint64_t>(opcode, guest_va + 24, 0);
}

uint8_t *mmu_translate_imem(uint32_t vaddr, uint32_t *paddr)
{
#if SUPPORTS_PPC_LITTLE_ENDIAN_MODE
Expand Down
1 change: 1 addition & 0 deletions cpu/ppc/ppcmmu.h
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -94,6 +94,7 @@ extern MapDmaResult mmu_map_dma_mem(uint32_t addr, uint32_t size, bool allow_mmi
extern void mmu_change_mode(void);
extern void mmu_pat_ctx_changed();
extern void tlb_flush_entry(uint32_t ea);
extern void mmu_dcbz(uint32_t opcode, uint32_t guest_va);

extern uint64_t mem_read_dbg(uint32_t virt_addr, uint32_t size);
extern void mem_write_dbg(uint32_t virt_addr, uint64_t value, int size);
Expand Down
7 changes: 1 addition & 6 deletions cpu/ppc/ppcopcodes.cpp
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -1616,12 +1616,7 @@ void dppc_interpreter::ppc_dcbz(uint32_t opcode) {

ea &= 0xFFFFFFE0UL; // align EA on a 32-byte boundary

// the following is not especially efficient but necessary
// to make BlockZero under Mac OS 8.x and later to work
mmu_write_vmem<uint64_t>(opcode, ea + 0, 0);
mmu_write_vmem<uint64_t>(opcode, ea + 8, 0);
mmu_write_vmem<uint64_t>(opcode, ea + 16, 0);
mmu_write_vmem<uint64_t>(opcode, ea + 24, 0);
mmu_dcbz(opcode, ea);
}


Expand Down
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ppcmmu: Ignore dcbz for MMIO regions by mihaip · Pull Request #203 · dingusdev/dingusppc · GitHub
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ppcmmu: Ignore dcbz for MMIO regions#203

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dingusdev
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Aug 8, 2026
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ppcmmu: Ignore dcbz for MMIO regions
#203
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43 changes: 43 additions & 0 deletions
cpu/ppc/ppcmmu.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -864,6 +864,49 @@ static inline TLBEntry* lookup_secondary_tlb(uint32_t guest_va, uint32_t tag) {
 return tlb_entry;
}

void mmu_dcbz(uint32_t opcode, uint32_t guest_va)
{
 const uint32_t tag = guest_va & ~0xFFFUL;
 // look up guest virtual address in the primary TLB
 TLBEntry *tlb_entry = &pCurDTLB1[(guest_va >> PPC_PAGE_SIZE_BITS) & tlb_size_mask];

 if (!tlb_entry->matches_tag(tag)) {
 // primary TLB miss -> look up address in the secondary TLB
 tlb_entry = lookup_secondary_tlb<TLBType::DTLB>(guest_va, tag);
 if (tlb_entry == nullptr) {
 // secondary TLB miss ->
 // perform full address translation and refill the secondary TLB
 tlb_entry = dtlb2_refill(guest_va, 1);
 }
 }

 // Check if this was in a MMIO region, in which case we avoid doing the
 // write, so that this intermediate state is not visible to the device
 // (usually a dcbz is done to prepare a cache line as a write buffer, and
 // the real values are written later).
 if (tlb_entry->flags & TLBFlags::PAGE_IO) {
 // Still do the same checks that mmu_write_vmem would have done to
 // disallow writes to read-only regions.
 if (!(tlb_entry->flags & TLBFlags::PAGE_WRITABLE)) {
 ppc_state.spr[SPR::DSISR] = 0x08000000 | (1 << 25);
 ppc_state.spr[SPR::DAR] = guest_va;
 mmu_exception_handler(Except_Type::EXC_DSI, 0);
 }
 if (!(tlb_entry->flags & TLBFlags::PTE_SET_C)) {
 page_address_translation(guest_va, false, !!(ppc_state.msr & MSR::PR), true);
 tlb_entry->flags |= TLBFlags::PTE_SET_C;
 }
 return;
 }

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, guest_va + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 24, 0);
}

uint8_t *mmu_translate_imem(uint32_t vaddr, uint32_t *paddr)
{
#if SUPPORTS_PPC_LITTLE_ENDIAN_MODE
Expand Down

1 change: 1 addition & 0 deletions
cpu/ppc/ppcmmu.h

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,6 +94,7 @@ extern MapDmaResult mmu_map_dma_mem(uint32_t addr, uint32_t size, bool allow_mmi
extern void mmu_change_mode(void);
extern void mmu_pat_ctx_changed();
extern void tlb_flush_entry(uint32_t ea);
extern void mmu_dcbz(uint32_t opcode, uint32_t guest_va);

extern uint64_t mem_read_dbg(uint32_t virt_addr, uint32_t size);
extern void mem_write_dbg(uint32_t virt_addr, uint64_t value, int size);
Expand Down

7 changes: 1 addition & 6 deletions
cpu/ppc/ppcopcodes.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1616,12 +1616,7 @@ void dppc_interpreter::ppc_dcbz(uint32_t opcode) {

 ea &= 0xFFFFFFE0UL; // align EA on a 32-byte boundary

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, ea + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 24, 0);
 mmu_dcbz(opcode, ea);
}


Expand Down
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ppcmmu: Ignore dcbz for MMIO regions by mihaip · Pull Request #203 · dingusdev/dingusppc · GitHub
Skip to content
ppcmmu: Ignore dcbz for MMIO regions#203

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 Merged

dingusdev
merged 1 commit into

from

Aug 8, 2026
 Merged


ppcmmu: Ignore dcbz for MMIO regions
#203
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43 changes: 43 additions & 0 deletions
cpu/ppc/ppcmmu.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -864,6 +864,49 @@ static inline TLBEntry* lookup_secondary_tlb(uint32_t guest_va, uint32_t tag) {
 return tlb_entry;
}

void mmu_dcbz(uint32_t opcode, uint32_t guest_va)
{
 const uint32_t tag = guest_va & ~0xFFFUL;
 // look up guest virtual address in the primary TLB
 TLBEntry *tlb_entry = &pCurDTLB1[(guest_va >> PPC_PAGE_SIZE_BITS) & tlb_size_mask];

 if (!tlb_entry->matches_tag(tag)) {
 // primary TLB miss -> look up address in the secondary TLB
 tlb_entry = lookup_secondary_tlb<TLBType::DTLB>(guest_va, tag);
 if (tlb_entry == nullptr) {
 // secondary TLB miss ->
 // perform full address translation and refill the secondary TLB
 tlb_entry = dtlb2_refill(guest_va, 1);
 }
 }

 // Check if this was in a MMIO region, in which case we avoid doing the
 // write, so that this intermediate state is not visible to the device
 // (usually a dcbz is done to prepare a cache line as a write buffer, and
 // the real values are written later).
 if (tlb_entry->flags & TLBFlags::PAGE_IO) {
 // Still do the same checks that mmu_write_vmem would have done to
 // disallow writes to read-only regions.
 if (!(tlb_entry->flags & TLBFlags::PAGE_WRITABLE)) {
 ppc_state.spr[SPR::DSISR] = 0x08000000 | (1 << 25);
 ppc_state.spr[SPR::DAR] = guest_va;
 mmu_exception_handler(Except_Type::EXC_DSI, 0);
 }
 if (!(tlb_entry->flags & TLBFlags::PTE_SET_C)) {
 page_address_translation(guest_va, false, !!(ppc_state.msr & MSR::PR), true);
 tlb_entry->flags |= TLBFlags::PTE_SET_C;
 }
 return;
 }

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, guest_va + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 24, 0);
}

uint8_t *mmu_translate_imem(uint32_t vaddr, uint32_t *paddr)
{
#if SUPPORTS_PPC_LITTLE_ENDIAN_MODE
Expand Down

1 change: 1 addition & 0 deletions
cpu/ppc/ppcmmu.h

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,6 +94,7 @@ extern MapDmaResult mmu_map_dma_mem(uint32_t addr, uint32_t size, bool allow_mmi
extern void mmu_change_mode(void);
extern void mmu_pat_ctx_changed();
extern void tlb_flush_entry(uint32_t ea);
extern void mmu_dcbz(uint32_t opcode, uint32_t guest_va);

extern uint64_t mem_read_dbg(uint32_t virt_addr, uint32_t size);
extern void mem_write_dbg(uint32_t virt_addr, uint64_t value, int size);
Expand Down

7 changes: 1 addition & 6 deletions
cpu/ppc/ppcopcodes.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1616,12 +1616,7 @@ void dppc_interpreter::ppc_dcbz(uint32_t opcode) {

 ea &= 0xFFFFFFE0UL; // align EA on a 32-byte boundary

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, ea + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 24, 0);
 mmu_dcbz(opcode, ea);
}


Expand Down
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ppcmmu: Ignore dcbz for MMIO regions by mihaip · Pull Request #203 · dingusdev/dingusppc · GitHub
Skip to content
ppcmmu: Ignore dcbz for MMIO regions#203

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 Merged

dingusdev
merged 1 commit into

from

Aug 8, 2026
 Merged


ppcmmu: Ignore dcbz for MMIO regions
#203
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43 changes: 43 additions & 0 deletions
cpu/ppc/ppcmmu.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -864,6 +864,49 @@ static inline TLBEntry* lookup_secondary_tlb(uint32_t guest_va, uint32_t tag) {
 return tlb_entry;
}

void mmu_dcbz(uint32_t opcode, uint32_t guest_va)
{
 const uint32_t tag = guest_va & ~0xFFFUL;
 // look up guest virtual address in the primary TLB
 TLBEntry *tlb_entry = &pCurDTLB1[(guest_va >> PPC_PAGE_SIZE_BITS) & tlb_size_mask];

 if (!tlb_entry->matches_tag(tag)) {
 // primary TLB miss -> look up address in the secondary TLB
 tlb_entry = lookup_secondary_tlb<TLBType::DTLB>(guest_va, tag);
 if (tlb_entry == nullptr) {
 // secondary TLB miss ->
 // perform full address translation and refill the secondary TLB
 tlb_entry = dtlb2_refill(guest_va, 1);
 }
 }

 // Check if this was in a MMIO region, in which case we avoid doing the
 // write, so that this intermediate state is not visible to the device
 // (usually a dcbz is done to prepare a cache line as a write buffer, and
 // the real values are written later).
 if (tlb_entry->flags & TLBFlags::PAGE_IO) {
 // Still do the same checks that mmu_write_vmem would have done to
 // disallow writes to read-only regions.
 if (!(tlb_entry->flags & TLBFlags::PAGE_WRITABLE)) {
 ppc_state.spr[SPR::DSISR] = 0x08000000 | (1 << 25);
 ppc_state.spr[SPR::DAR] = guest_va;
 mmu_exception_handler(Except_Type::EXC_DSI, 0);
 }
 if (!(tlb_entry->flags & TLBFlags::PTE_SET_C)) {
 page_address_translation(guest_va, false, !!(ppc_state.msr & MSR::PR), true);
 tlb_entry->flags |= TLBFlags::PTE_SET_C;
 }
 return;
 }

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, guest_va + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 24, 0);
}

uint8_t *mmu_translate_imem(uint32_t vaddr, uint32_t *paddr)
{
#if SUPPORTS_PPC_LITTLE_ENDIAN_MODE
Expand Down

1 change: 1 addition & 0 deletions
cpu/ppc/ppcmmu.h

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,6 +94,7 @@ extern MapDmaResult mmu_map_dma_mem(uint32_t addr, uint32_t size, bool allow_mmi
extern void mmu_change_mode(void);
extern void mmu_pat_ctx_changed();
extern void tlb_flush_entry(uint32_t ea);
extern void mmu_dcbz(uint32_t opcode, uint32_t guest_va);

extern uint64_t mem_read_dbg(uint32_t virt_addr, uint32_t size);
extern void mem_write_dbg(uint32_t virt_addr, uint64_t value, int size);
Expand Down

7 changes: 1 addition & 6 deletions
cpu/ppc/ppcopcodes.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1616,12 +1616,7 @@ void dppc_interpreter::ppc_dcbz(uint32_t opcode) {

 ea &= 0xFFFFFFE0UL; // align EA on a 32-byte boundary

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, ea + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 24, 0);
 mmu_dcbz(opcode, ea);
}


Expand Down
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ppcmmu: Ignore dcbz for MMIO regions by mihaip · Pull Request #203 · dingusdev/dingusppc · GitHub
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ppcmmu: Ignore dcbz for MMIO regions#203

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ppcmmu: Ignore dcbz for MMIO regions
#203
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43 changes: 43 additions & 0 deletions
cpu/ppc/ppcmmu.cpp

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -864,6 +864,49 @@ static inline TLBEntry* lookup_secondary_tlb(uint32_t guest_va, uint32_t tag) {
 return tlb_entry;
}

void mmu_dcbz(uint32_t opcode, uint32_t guest_va)
{
 const uint32_t tag = guest_va & ~0xFFFUL;
 // look up guest virtual address in the primary TLB
 TLBEntry *tlb_entry = &pCurDTLB1[(guest_va >> PPC_PAGE_SIZE_BITS) & tlb_size_mask];

 if (!tlb_entry->matches_tag(tag)) {
 // primary TLB miss -> look up address in the secondary TLB
 tlb_entry = lookup_secondary_tlb<TLBType::DTLB>(guest_va, tag);
 if (tlb_entry == nullptr) {
 // secondary TLB miss ->
 // perform full address translation and refill the secondary TLB
 tlb_entry = dtlb2_refill(guest_va, 1);
 }
 }

 // Check if this was in a MMIO region, in which case we avoid doing the
 // write, so that this intermediate state is not visible to the device
 // (usually a dcbz is done to prepare a cache line as a write buffer, and
 // the real values are written later).
 if (tlb_entry->flags & TLBFlags::PAGE_IO) {
 // Still do the same checks that mmu_write_vmem would have done to
 // disallow writes to read-only regions.
 if (!(tlb_entry->flags & TLBFlags::PAGE_WRITABLE)) {
 ppc_state.spr[SPR::DSISR] = 0x08000000 | (1 << 25);
 ppc_state.spr[SPR::DAR] = guest_va;
 mmu_exception_handler(Except_Type::EXC_DSI, 0);
 }
 if (!(tlb_entry->flags & TLBFlags::PTE_SET_C)) {
 page_address_translation(guest_va, false, !!(ppc_state.msr & MSR::PR), true);
 tlb_entry->flags |= TLBFlags::PTE_SET_C;
 }
 return;
 }

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, guest_va + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 24, 0);
}

uint8_t *mmu_translate_imem(uint32_t vaddr, uint32_t *paddr)
{
#if SUPPORTS_PPC_LITTLE_ENDIAN_MODE
Expand Down

1 change: 1 addition & 0 deletions
cpu/ppc/ppcmmu.h

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,6 +94,7 @@ extern MapDmaResult mmu_map_dma_mem(uint32_t addr, uint32_t size, bool allow_mmi
extern void mmu_change_mode(void);
extern void mmu_pat_ctx_changed();
extern void tlb_flush_entry(uint32_t ea);
extern void mmu_dcbz(uint32_t opcode, uint32_t guest_va);

extern uint64_t mem_read_dbg(uint32_t virt_addr, uint32_t size);
extern void mem_write_dbg(uint32_t virt_addr, uint64_t value, int size);
Expand Down

7 changes: 1 addition & 6 deletions
cpu/ppc/ppcopcodes.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1616,12 +1616,7 @@ void dppc_interpreter::ppc_dcbz(uint32_t opcode) {

 ea &= 0xFFFFFFE0UL; // align EA on a 32-byte boundary

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, ea + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 24, 0);
 mmu_dcbz(opcode, ea);
}


Expand Down
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ppcmmu: Ignore dcbz for MMIO regions by mihaip · Pull Request #203 · dingusdev/dingusppc · GitHub
Skip to content
ppcmmu: Ignore dcbz for MMIO regions#203

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Aug 8, 2026
 Merged


ppcmmu: Ignore dcbz for MMIO regions
#203
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43 changes: 43 additions & 0 deletions
cpu/ppc/ppcmmu.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -864,6 +864,49 @@ static inline TLBEntry* lookup_secondary_tlb(uint32_t guest_va, uint32_t tag) {
 return tlb_entry;
}

void mmu_dcbz(uint32_t opcode, uint32_t guest_va)
{
 const uint32_t tag = guest_va & ~0xFFFUL;
 // look up guest virtual address in the primary TLB
 TLBEntry *tlb_entry = &pCurDTLB1[(guest_va >> PPC_PAGE_SIZE_BITS) & tlb_size_mask];

 if (!tlb_entry->matches_tag(tag)) {
 // primary TLB miss -> look up address in the secondary TLB
 tlb_entry = lookup_secondary_tlb<TLBType::DTLB>(guest_va, tag);
 if (tlb_entry == nullptr) {
 // secondary TLB miss ->
 // perform full address translation and refill the secondary TLB
 tlb_entry = dtlb2_refill(guest_va, 1);
 }
 }

 // Check if this was in a MMIO region, in which case we avoid doing the
 // write, so that this intermediate state is not visible to the device
 // (usually a dcbz is done to prepare a cache line as a write buffer, and
 // the real values are written later).
 if (tlb_entry->flags & TLBFlags::PAGE_IO) {
 // Still do the same checks that mmu_write_vmem would have done to
 // disallow writes to read-only regions.
 if (!(tlb_entry->flags & TLBFlags::PAGE_WRITABLE)) {
 ppc_state.spr[SPR::DSISR] = 0x08000000 | (1 << 25);
 ppc_state.spr[SPR::DAR] = guest_va;
 mmu_exception_handler(Except_Type::EXC_DSI, 0);
 }
 if (!(tlb_entry->flags & TLBFlags::PTE_SET_C)) {
 page_address_translation(guest_va, false, !!(ppc_state.msr & MSR::PR), true);
 tlb_entry->flags |= TLBFlags::PTE_SET_C;
 }
 return;
 }

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, guest_va + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 24, 0);
}

uint8_t *mmu_translate_imem(uint32_t vaddr, uint32_t *paddr)
{
#if SUPPORTS_PPC_LITTLE_ENDIAN_MODE
Expand Down

1 change: 1 addition & 0 deletions
cpu/ppc/ppcmmu.h

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,6 +94,7 @@ extern MapDmaResult mmu_map_dma_mem(uint32_t addr, uint32_t size, bool allow_mmi
extern void mmu_change_mode(void);
extern void mmu_pat_ctx_changed();
extern void tlb_flush_entry(uint32_t ea);
extern void mmu_dcbz(uint32_t opcode, uint32_t guest_va);

extern uint64_t mem_read_dbg(uint32_t virt_addr, uint32_t size);
extern void mem_write_dbg(uint32_t virt_addr, uint64_t value, int size);
Expand Down

7 changes: 1 addition & 6 deletions
cpu/ppc/ppcopcodes.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1616,12 +1616,7 @@ void dppc_interpreter::ppc_dcbz(uint32_t opcode) {

 ea &= 0xFFFFFFE0UL; // align EA on a 32-byte boundary

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, ea + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 24, 0);
 mmu_dcbz(opcode, ea);
}


Expand Down
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if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
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el.style.zIndex = 'auto';
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var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
ppcmmu: Ignore dcbz for MMIO regions by mihaip · Pull Request #203 · dingusdev/dingusppc · GitHub
Skip to content
ppcmmu: Ignore dcbz for MMIO regions#203

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 Merged

dingusdev
merged 1 commit into

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Aug 8, 2026
 Merged


ppcmmu: Ignore dcbz for MMIO regions
#203
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43 changes: 43 additions & 0 deletions
cpu/ppc/ppcmmu.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -864,6 +864,49 @@ static inline TLBEntry* lookup_secondary_tlb(uint32_t guest_va, uint32_t tag) {
 return tlb_entry;
}

void mmu_dcbz(uint32_t opcode, uint32_t guest_va)
{
 const uint32_t tag = guest_va & ~0xFFFUL;
 // look up guest virtual address in the primary TLB
 TLBEntry *tlb_entry = &pCurDTLB1[(guest_va >> PPC_PAGE_SIZE_BITS) & tlb_size_mask];

 if (!tlb_entry->matches_tag(tag)) {
 // primary TLB miss -> look up address in the secondary TLB
 tlb_entry = lookup_secondary_tlb<TLBType::DTLB>(guest_va, tag);
 if (tlb_entry == nullptr) {
 // secondary TLB miss ->
 // perform full address translation and refill the secondary TLB
 tlb_entry = dtlb2_refill(guest_va, 1);
 }
 }

 // Check if this was in a MMIO region, in which case we avoid doing the
 // write, so that this intermediate state is not visible to the device
 // (usually a dcbz is done to prepare a cache line as a write buffer, and
 // the real values are written later).
 if (tlb_entry->flags & TLBFlags::PAGE_IO) {
 // Still do the same checks that mmu_write_vmem would have done to
 // disallow writes to read-only regions.
 if (!(tlb_entry->flags & TLBFlags::PAGE_WRITABLE)) {
 ppc_state.spr[SPR::DSISR] = 0x08000000 | (1 << 25);
 ppc_state.spr[SPR::DAR] = guest_va;
 mmu_exception_handler(Except_Type::EXC_DSI, 0);
 }
 if (!(tlb_entry->flags & TLBFlags::PTE_SET_C)) {
 page_address_translation(guest_va, false, !!(ppc_state.msr & MSR::PR), true);
 tlb_entry->flags |= TLBFlags::PTE_SET_C;
 }
 return;
 }

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, guest_va + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 24, 0);
}

uint8_t *mmu_translate_imem(uint32_t vaddr, uint32_t *paddr)
{
#if SUPPORTS_PPC_LITTLE_ENDIAN_MODE
Expand Down

1 change: 1 addition & 0 deletions
cpu/ppc/ppcmmu.h

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,6 +94,7 @@ extern MapDmaResult mmu_map_dma_mem(uint32_t addr, uint32_t size, bool allow_mmi
extern void mmu_change_mode(void);
extern void mmu_pat_ctx_changed();
extern void tlb_flush_entry(uint32_t ea);
extern void mmu_dcbz(uint32_t opcode, uint32_t guest_va);

extern uint64_t mem_read_dbg(uint32_t virt_addr, uint32_t size);
extern void mem_write_dbg(uint32_t virt_addr, uint64_t value, int size);
Expand Down

7 changes: 1 addition & 6 deletions
cpu/ppc/ppcopcodes.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1616,12 +1616,7 @@ void dppc_interpreter::ppc_dcbz(uint32_t opcode) {

 ea &= 0xFFFFFFE0UL; // align EA on a 32-byte boundary

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, ea + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 24, 0);
 mmu_dcbz(opcode, ea);
}


Expand Down
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function applyDarkMode() {
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style = document.createElement('style');
style.id = 'universal-dark-mode-style';
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/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
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.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
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/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
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::-webkit-scrollbar-thumb { background: #444 !important; }
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ppcmmu: Ignore dcbz for MMIO regions by mihaip · Pull Request #203 · dingusdev/dingusppc · GitHub
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ppcmmu: Ignore dcbz for MMIO regions#203

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 Merged

dingusdev
merged 1 commit into

from

Aug 8, 2026
 Merged


ppcmmu: Ignore dcbz for MMIO regions
#203
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43 changes: 43 additions & 0 deletions
cpu/ppc/ppcmmu.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -864,6 +864,49 @@ static inline TLBEntry* lookup_secondary_tlb(uint32_t guest_va, uint32_t tag) {
 return tlb_entry;
}

void mmu_dcbz(uint32_t opcode, uint32_t guest_va)
{
 const uint32_t tag = guest_va & ~0xFFFUL;
 // look up guest virtual address in the primary TLB
 TLBEntry *tlb_entry = &pCurDTLB1[(guest_va >> PPC_PAGE_SIZE_BITS) & tlb_size_mask];

 if (!tlb_entry->matches_tag(tag)) {
 // primary TLB miss -> look up address in the secondary TLB
 tlb_entry = lookup_secondary_tlb<TLBType::DTLB>(guest_va, tag);
 if (tlb_entry == nullptr) {
 // secondary TLB miss ->
 // perform full address translation and refill the secondary TLB
 tlb_entry = dtlb2_refill(guest_va, 1);
 }
 }

 // Check if this was in a MMIO region, in which case we avoid doing the
 // write, so that this intermediate state is not visible to the device
 // (usually a dcbz is done to prepare a cache line as a write buffer, and
 // the real values are written later).
 if (tlb_entry->flags & TLBFlags::PAGE_IO) {
 // Still do the same checks that mmu_write_vmem would have done to
 // disallow writes to read-only regions.
 if (!(tlb_entry->flags & TLBFlags::PAGE_WRITABLE)) {
 ppc_state.spr[SPR::DSISR] = 0x08000000 | (1 << 25);
 ppc_state.spr[SPR::DAR] = guest_va;
 mmu_exception_handler(Except_Type::EXC_DSI, 0);
 }
 if (!(tlb_entry->flags & TLBFlags::PTE_SET_C)) {
 page_address_translation(guest_va, false, !!(ppc_state.msr & MSR::PR), true);
 tlb_entry->flags |= TLBFlags::PTE_SET_C;
 }
 return;
 }

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, guest_va + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, guest_va + 24, 0);
}

uint8_t *mmu_translate_imem(uint32_t vaddr, uint32_t *paddr)
{
#if SUPPORTS_PPC_LITTLE_ENDIAN_MODE
Expand Down

1 change: 1 addition & 0 deletions
cpu/ppc/ppcmmu.h

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,6 +94,7 @@ extern MapDmaResult mmu_map_dma_mem(uint32_t addr, uint32_t size, bool allow_mmi
extern void mmu_change_mode(void);
extern void mmu_pat_ctx_changed();
extern void tlb_flush_entry(uint32_t ea);
extern void mmu_dcbz(uint32_t opcode, uint32_t guest_va);

extern uint64_t mem_read_dbg(uint32_t virt_addr, uint32_t size);
extern void mem_write_dbg(uint32_t virt_addr, uint64_t value, int size);
Expand Down

7 changes: 1 addition & 6 deletions
cpu/ppc/ppcopcodes.cpp

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1616,12 +1616,7 @@ void dppc_interpreter::ppc_dcbz(uint32_t opcode) {

 ea &= 0xFFFFFFE0UL; // align EA on a 32-byte boundary

 // the following is not especially efficient but necessary
 // to make BlockZero under Mac OS 8.x and later to work
 mmu_write_vmem<uint64_t>(opcode, ea + 0, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 8, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 16, 0);
 mmu_write_vmem<uint64_t>(opcode, ea + 24, 0);
 mmu_dcbz(opcode, ea);
}


Expand Down
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