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Bus: Handle unaligned writes to DMA

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This commit is contained in:
Connor McLaughlin 2019-09-30 17:21:57 +10:00
parent 68883168cd
commit 65c9dfa4fd
1 changed files with 29 additions and 2 deletions
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31
src/pse/bus.cpp
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@ -451,14 +451,41 @@ bool Bus::DoWriteSPU(MemoryAccessSize size, u32 offset, u32 value)
bool Bus::DoReadDMA(MemoryAccessSize size, u32 offset, u32& value) bool Bus::DoReadDMA(MemoryAccessSize size, u32 offset, u32& value)
{ {
Assert(size == MemoryAccessSize::Word); switch (size)
{
case MemoryAccessSize::Byte:
case MemoryAccessSize::HalfWord:
{
if ((offset & u32(0xF0)) >= 7 || (offset & u32(0x0F)) != 0x4)
FixupUnalignedWordAccessW32(offset, value);
}
default:
break;
}
value = m_dma->ReadRegister(offset); value = m_dma->ReadRegister(offset);
return true; return true;
} }
bool Bus::DoWriteDMA(MemoryAccessSize size, u32 offset, u32 value) bool Bus::DoWriteDMA(MemoryAccessSize size, u32 offset, u32 value)
{ {
Assert(size == MemoryAccessSize::Word); switch (size)
{
case MemoryAccessSize::Byte:
case MemoryAccessSize::HalfWord:
{
// zero extend length register
if ((offset & u32(0xF0)) < 7 && (offset & u32(0x0F)) == 0x4)
value = ZeroExtend32(value);
else
FixupUnalignedWordAccessW32(offset, value);
}
default:
break;
}
m_dma->WriteRegister(offset, value); m_dma->WriteRegister(offset, value);
return true; return true;
} }