0xrsydn/gameboy-rust
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fix(memory): ignore emulated writes to mapped BIOS

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0xrsydn 2026-10-07 03:31:33 +07:00
commit a0516de748
16 changed files with 462 additions and 34 deletions
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14
crates/gba-core/tests/bios/ram_reset.rs
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@ -436,14 +436,14 @@ fn dma_reset_disables_channels_and_clears_write_only_address_and_count_latches()
);
m.memory_mut().write16(base + 10, 0).unwrap();
m.memory_mut().write32(base, SOURCE).unwrap();
m.memory_mut().write32(SOURCE, MARKER).unwrap();
m.memory_mut().write32(DEST, !MARKER).unwrap();
let vector = m.memory().read32(0).unwrap();
m.memory_mut().write16(base + 10, 0x8000).unwrap();
assert_eq!(
m.step(),
Err(MachineError::Dma(DmaError::Memory {
channel,
error: MemoryError::ReadOnly(0)
}))
);
assert_eq!(m.step().unwrap(), StepKind::Dma { channel });
// The reset destination is BIOS: discard the transfer, not into stale DEST.
assert_eq!(m.memory().read32(0).unwrap(), vector);
assert_eq!(m.memory().read32(DEST).unwrap(), !MARKER);
m.memory_mut().write16(base + 10, 0).unwrap();
m.memory_mut().write32(base + 4, DEST).unwrap();
m.memory_mut().write32(SOURCE, MARKER).unwrap();