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

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Add RLUnCompWram and RLUnCompVram with block bounds, word-independent buffering, and device-progress tests.
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0xrsydn 2026-10-05 12:55:35 +07:00
commit 5984551784
4 changed files with 466 additions and 0 deletions
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5
src/bios.rs
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@ -2,6 +2,7 @@
//! Supports interrupt waits and memory copy/fill.
//! Includes integer arithmetic services.
//! Includes LZ77 decoding.
//! Includes run-length decoding.
//! This is a functional subset, not a complete boot ROM or a timing-compatible BIOS.
use std::collections::BTreeMap;
@ -9,6 +10,7 @@ use std::collections::BTreeMap;
mod arithmetic;
mod decompression;
mod lz77;
mod run_length;
use crate::{
cpu::Cpu,
@ -122,6 +124,8 @@ pub fn image() -> Vec<u8> {
(0x0c, "cpu_fast_set"),
(0x11, "lz_wram"),
(0x12, "lz_vram"),
(0x14, "rl_wram"),
(0x15, "rl_vram"),
] {
a.emit(0xe35c_0000 | number); // CMP r12,#service
a.branch(0, target);
@ -215,6 +219,7 @@ pub fn image() -> Vec<u8> {
arithmetic::emit(&mut a);
lz77::emit(&mut a);
run_length::emit(&mut a);
decompression::emit_writer(&mut a);
a.label("return");