0xrsydn/gameboy-rust
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feat(bios): implement SoftReset restart service

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Execute SWI 0x00 through original ARM code. Read the restart flag before clearing 512 bytes of BIOS work RAM, reset System/SVC/IRQ stacks and specified registers, then branch to ROM or EWRAM in ARM System mode.

Keep device state and clocks active, preserve unrelated CPU banks, and document the deterministic IRQ-masked restart status. Add eleven tests for every flag byte, ARM/Thumb and User/System callers, exact memory bounds, bank state, restart execution, DMA/timers, and unsupported exception callers.

Validated on Darwin arm64: 705 default and 694 core-only tests in debug and release; formatting, Clippy, rustdoc, ten native window smoke tests, and CPU/timer demos pass.
This commit is contained in:
0xrsydn 2026-10-05 15:35:09 +07:00
commit 2dfab137a6
5 changed files with 468 additions and 12 deletions
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4
tests/bios.rs
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@ -26,6 +26,8 @@ mod differential;
mod huffman;
#[path = "bios/lz77.rs"]
mod lz77;
#[path = "bios/reset.rs"]
mod reset;
#[path = "bios/run_length.rs"]
mod run_length;
@ -227,7 +229,7 @@ fn vblank_wait_halts_dispatches_irq_and_returns_through_original_code() {
#[test]
fn unsupported_services_fail_at_an_explicit_instruction_trap() {
for service in [0, 1, 3, 0x0d, 0x19, 0xff] {
for service in [1, 3, 0x0d, 0x19, 0xff] {
let (mut machine, _) = call(service, false, [0, 0, 0]);
let error = (0..100)
.find_map(|_| machine.step().err())