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CPU: Add additional instruction decoder helpers

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This commit is contained in:
Connor McLaughlin
2020-12-17 01:11:50 +10:00
parent 9fd1d606d7
commit e044858953
3 changed files with 94 additions and 1 deletions
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36
src/core/cpu_core_private.h
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@ -64,7 +64,41 @@ TickCount GetICacheFillTicks(VirtualMemoryAddress address);
u32 FillICache(VirtualMemoryAddress address);
void CheckAndUpdateICacheTags(u32 line_count, TickCount uncached_ticks);
// defined in cpu_memory.cpp - memory access functions which return false if an exception was thrown.
ALWAYS_INLINE Segment GetSegmentForAddress(VirtualMemoryAddress address)
{
switch ((address >> 29))
{
case 0x00: // KUSEG 0M-512M
case 0x01: // KUSEG 512M-1024M
case 0x02: // KUSEG 1024M-1536M
case 0x03: // KUSEG 1536M-2048M
return Segment::KUSEG;
case 0x04: // KSEG0 - physical memory cached
return Segment::KSEG0;
case 0x05: // KSEG1 - physical memory uncached
return Segment::KSEG1;
case 0x06: // KSEG2
case 0x07: // KSEG2
default:
return Segment::KSEG2;
}
}
ALWAYS_INLINE PhysicalMemoryAddress VirtualAddressToPhysical(VirtualMemoryAddress address)
{
return (address & PHYSICAL_MEMORY_ADDRESS_MASK);
}
ALWAYS_INLINE VirtualMemoryAddress PhysicalAddressToVirtual(PhysicalMemoryAddress address, Segment segment)
{
static constexpr std::array<VirtualMemoryAddress, 4> bases = {{0x00000000, 0x80000000, 0xA0000000, 0xE0000000}};
return bases[static_cast<u32>(segment)] | address;
}
// defined in bus.cpp - memory access functions which return false if an exception was thrown.
bool FetchInstruction();
bool SafeReadInstruction(VirtualMemoryAddress addr, u32* value);
bool ReadMemoryByte(VirtualMemoryAddress addr, u8* value);