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Bus: Mirror BIOS area up to 4MB 

Fixes bus error when using PS2 BIOS.
This commit is contained in:
Stenzek 2024-07-18 18:07:06 +10:00
parent 7217536fdd
commit 19063d4288
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2 changed files with 4 additions and 3 deletions
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6
src/core/bus.cpp
View File

@ -1652,7 +1652,7 @@ void Bus::SetHandlers()
// Cache isolated appears to affect KUSEG+KSEG0.
SET(g_memory_handlers, KUSEG | RAM_BASE, RAM_MIRROR_SIZE, RAMReadHandler, RAMWriteHandler);
SET(g_memory_handlers, KUSEG | CPU::SCRATCHPAD_ADDR, 0x1000, ScratchpadReadHandler, ScratchpadWriteHandler);
SET(g_memory_handlers, KUSEG | BIOS_BASE, BIOS_SIZE, BIOSReadHandler, IgnoreWriteHandler);
SET(g_memory_handlers, KUSEG | BIOS_BASE, BIOS_MIRROR_SIZE, BIOSReadHandler, IgnoreWriteHandler);
SET(g_memory_handlers, KUSEG | EXP1_BASE, EXP1_SIZE, EXP1ReadHandler, EXP1WriteHandler);
SET(g_memory_handlers, KUSEG | HW_BASE, HW_SIZE, HardwareReadHandler, HardwareWriteHandler);
SET(g_memory_handlers, KUSEG | EXP2_BASE, EXP2_SIZE, EXP2ReadHandler, EXP2WriteHandler);
@ -1662,7 +1662,7 @@ void Bus::SetHandlers()
// KSEG0 - Cached
SET(g_memory_handlers, KSEG0 | RAM_BASE, RAM_MIRROR_SIZE, RAMReadHandler, RAMWriteHandler);
SET(g_memory_handlers, KSEG0 | CPU::SCRATCHPAD_ADDR, 0x1000, ScratchpadReadHandler, ScratchpadWriteHandler);
SET(g_memory_handlers, KSEG0 | BIOS_BASE, BIOS_SIZE, BIOSReadHandler, IgnoreWriteHandler);
SET(g_memory_handlers, KSEG0 | BIOS_BASE, BIOS_MIRROR_SIZE, BIOSReadHandler, IgnoreWriteHandler);
SET(g_memory_handlers, KSEG0 | EXP1_BASE, EXP1_SIZE, EXP1ReadHandler, EXP1WriteHandler);
SET(g_memory_handlers, KSEG0 | HW_BASE, HW_SIZE, HardwareReadHandler, HardwareWriteHandler);
SET(g_memory_handlers, KSEG0 | EXP2_BASE, EXP2_SIZE, EXP2ReadHandler, EXP2WriteHandler);
@ -1671,7 +1671,7 @@ void Bus::SetHandlers()
// KSEG1 - Uncached
SETUC(KSEG1 | RAM_BASE, RAM_MIRROR_SIZE, RAMReadHandler, RAMWriteHandler);
SETUC(KSEG1 | BIOS_BASE, BIOS_SIZE, BIOSReadHandler, IgnoreWriteHandler);
SETUC(KSEG1 | BIOS_BASE, BIOS_MIRROR_SIZE, BIOSReadHandler, IgnoreWriteHandler);
SETUC(KSEG1 | EXP1_BASE, EXP1_SIZE, EXP1ReadHandler, EXP1WriteHandler);
SETUC(KSEG1 | HW_BASE, HW_SIZE, HardwareReadHandler, HardwareWriteHandler);
SETUC(KSEG1 | EXP2_BASE, EXP2_SIZE, EXP2ReadHandler, EXP2WriteHandler);

1
src/core/bus.h
View File

@ -75,6 +75,7 @@ enum : u32
EXP3_MASK = EXP3_SIZE - 1,
BIOS_BASE = 0x1FC00000,
BIOS_SIZE = 0x80000,
BIOS_MIRROR_SIZE = 0x400000,
BIOS_MASK = 0x7FFFF,
};