mirror of
https://github.com/Abdess/retroarch_system.git
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Every profile now has: - profiled_date: date of source code analysis - core_version: version from libretro-core-info .info files - display_name: human-readable name from .info files 260/260 profiles complete. 294/294 libretro cores covered. Standalone emulators (cemu, rpcs3, xemu, vita3k) versioned manually.
73 lines
3.2 KiB
YAML
73 lines
3.2 KiB
YAML
emulator: VBA-Next
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type: libretro
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source: "https://github.com/libretro/vba-next"
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profiled_date: "2026-03-18"
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core_version: "SVN"
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display_name: "Nintendo - Game Boy Advance (VBA Next)"
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cores:
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- vba_next
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systems:
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- nintendo-gba
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notes: |
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VBA-Next is a Game Boy Advance emulator forked from VBA-M, optimized for
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libretro. It includes a built-in HLE BIOS (myROM array in src/gba.cpp:8423)
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that handles all standard SWI calls, so no external BIOS file is needed for
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most games.
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BIOS loading is gated behind HAVE_HLE_BIOS (defined in build/Makefile.common)
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and controlled by core option vbanext_bios (default: enabled). When enabled,
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the libretro port looks for gba_bios.bin in RetroArch's system directory
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(libretro/libretro.cpp:198-203). CPUInit() loads the file via utilLoad(),
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validates it is exactly 0x4000 bytes (16 KB), and sets useBios = true
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(src/gba.cpp:12413-12443). If loading fails or the option is off, the HLE
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BIOS (myROM) is memcpy'd into the bios buffer instead.
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CPUIsGBABios() accepts extensions: .gba, .agb, .bin, .bios, .rom
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(src/gba.cpp:8851-8873).
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When useBios is true and skipBios is false, execution starts at 0x00000000
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(real BIOS entry). Otherwise it jumps straight to 0x08000000 (ROM entry),
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skipping the boot animation (src/gba.cpp:12657-12675).
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The HLE BIOS covers: SoftReset, RegisterRamReset, Halt, VBlankIntrWait,
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Div, Sqrt, ArcTan, ArcTan2, CpuSet, CpuFastSet, GetBiosChecksum,
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BgAffineSet, ObjAffineSet, BitUnPack, LZ77UnComp (WRAM/VRAM),
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HuffUnComp, RLUnComp (WRAM/VRAM), Diff8bitUnFilter (WRAM/VRAM),
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Diff16bitUnFilter, MidiKey2Freq, SndDriverJmpTableCopy
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(src/gba.cpp:2369-2578).
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Some per-game overrides in gbaover[] (libretro/libretro.cpp:235) have a
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useBios field, but all entries currently set it to 0 (no game forces BIOS).
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files:
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# -------------------------------------------------------
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# Game Boy Advance - BIOS (optional, HLE fallback)
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# -------------------------------------------------------
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- name: gba_bios.bin
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system: nintendo-gba
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required: false
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size: 16384 # 16 KB (0x4000)
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note: "GBA BIOS. Optional -- HLE replacement (myROM) handles all standard SWI calls. Real BIOS adds startup logo and may improve edge-case accuracy."
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source_ref: "libretro/libretro.cpp:198-203, src/gba.cpp:12413-12443"
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platform_details:
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gba:
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bios_size: 16384 # 0x4000
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hle_bios: true
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source_ref: "src/gba.cpp:8423 (myROM), src/gba.cpp:2369-2578 (SWI handlers)"
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notes: |
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BIOS buffer is always allocated at 0x4000 bytes (src/gba.cpp:8963).
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If the real BIOS loads successfully (exactly 0x4000 bytes), useBios is
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set to true and CPUReset starts at address 0x00000000 with IRQ disabled.
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Otherwise myROM (built-in HLE stub) is copied in and execution starts
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at 0x08000000 with standard register init.
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The core option vbanext_bios defaults to "enabled", so if gba_bios.bin
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is present in the system directory it will be loaded automatically.
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BIOS reads at runtime go through the memory map (src/gba.cpp:792-1076).
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Address range 0x0000-0x3FFF maps to the bios buffer. A biosProtected[4]
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array at 0x00f029e1 is returned when reading outside the current PC
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region, matching real GBA BIOS protection behavior.
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