0xrsydn/gameboy-rust
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feat(bios): decode LZ77 streams through ARM instructions

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Add byte and buffered-halfword output, overlapping references, argument diagnostics, and a reusable output routine.
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0xrsydn 2026-10-05 12:55:35 +07:00
commit 17e9351371
5 changed files with 531 additions and 0 deletions
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7
src/bios.rs
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@ -1,11 +1,14 @@
//! Original, optional ARM BIOS replacement. No Nintendo firmware is included.
//! Supports interrupt waits and memory copy/fill.
//! Includes integer arithmetic services.
//! Includes LZ77 decoding.
//! This is a functional subset, not a complete boot ROM or a timing-compatible BIOS.
use std::collections::BTreeMap;
mod arithmetic;
mod decompression;
mod lz77;
use crate::{
cpu::Cpu,
@ -117,6 +120,8 @@ pub fn image() -> Vec<u8> {
(8, "sqrt"),
(0x0b, "cpu_set"),
(0x0c, "cpu_fast_set"),
(0x11, "lz_wram"),
(0x12, "lz_vram"),
] {
a.emit(0xe35c_0000 | number); // CMP r12,#service
a.branch(0, target);
@ -209,6 +214,8 @@ pub fn image() -> Vec<u8> {
);
arithmetic::emit(&mut a);
lz77::emit(&mut a);
decompression::emit_writer(&mut a);
a.label("return");
a.emit(0xe10f_3000); // MRS r3,CPSR