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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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docs/testing.md
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@ -309,6 +309,10 @@ Status tests cover all modes, flag combinations, interrupt masks, field selectio
Exception tests cover vectors, ARM/Thumb return addresses, nested interrupts, mask priority, and return-state restoration.
User-bank transfers and failed returns are checked for unintended changes to active and hidden registers.
Integration tests execute original vector handlers and check optional BIOS mapping boundaries and write protection.
Mapped-BIOS write tests distinguish ignored CPU/DMA transfers from strict host writes without changing the supplied image.
They cover ARM/Thumb widths, lanes, modes, block stores, swaps, timing, DMA completion, and failed boundary transfers.
Original CpuSet/CpuFastSet callers verify ignored BIOS destinations without bypassing source reads or the service instructions.
Desktop DMA-error fixtures use an unmapped destination because DMA0 masks cartridge destination addresses into the BIOS region.
Original BIOS-access regressions check retained ARM PC+8 and aligned Thumb PC+4 words for ARM/Thumb callers.
They cover all processor modes, load widths, lanes, rotation, both Thumb code alignments, and distinct halfwords.
They verify direct reads while executing inside BIOS, re-entry, SWI/IRQ returns, host-inspection isolation, and original-boot provenance.