mirror of
https://github.com/Abdess/retroarch_system.git
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6a778a09a3
arduous (Arduboy AVR sim, no BIOS), boom3 (Doom 3, game data only), directxbox (Xbox, mcpx + cromwell), doukutsu_rs (Cave Story, no BIOS), meteor (GBA, full HLE), nxengine (Cave Story, Doukutsu.exe + data/), tgbdual (Game Boy link, HLE), tic80 (fantasy console), virtualxt (IBM XT, open BIOS embedded), sdlpal (Sword & Fairy, 13 .mkf) 125 total profiles.
56 lines
2.5 KiB
YAML
56 lines
2.5 KiB
YAML
emulator: Meteor GBA
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type: libretro
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source: "https://github.com/libretro/meteor-libretro"
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cores:
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- meteor
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systems:
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- nintendo-gba
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notes: |
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Meteor is a Game Boy Advance emulator by Philippe Daouadi (2009-2011).
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The libretro port does NOT load or use any external BIOS file. The core has
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a complete HLE BIOS implementation (ameteor/source/bios.cpp) that handles
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GBA SWI calls directly in C++. When no real BIOS is loaded (HasBios() returns
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false), Cpu::SoftwareInterrupt() dispatches SWI calls to the HLE handlers
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instead of executing the BIOS ROM (ameteor/source/cpu.cpp:244-311).
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The standalone frontends (GTK, text) expose LoadBios() for optional real BIOS
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loading, but the libretro port (libretro/libretro.cpp) never calls LoadBios()
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and never queries RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY. The retro_load_game()
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function only loads the ROM via LoadRom().
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HLE SWI coverage: SoftReset (0x00), RegisterRamReset (0x01), Halt (0x02),
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IntrWait (0x04), VBlankIntrWait (0x05), Div (0x06), DivArm (0x07),
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Sqrt (0x08), ArcTan (0x09), ArcTan2 (0x0A), CpuSet (0x0B),
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CpuFastSet (0x0C), BgAffineSet (0x0E), ObjAffineSet (0x0F),
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LZ77UnCompWram (0x11), LZ77UnCompVram (0x12), HuffUnComp (0x13),
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RLUnCompWram (0x14), RLUnCompVram (0x15).
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Missing from HLE: Stop (0x03), BitUnPack (0x10), Diff8bitUnFilter (0x16-0x17),
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Diff16bitUnFilter (0x18), SoundBias (0x19), SoundDriverInit (0x1A-0x1F),
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MidiKey2Freq (0x1F), SoundDriverVSyncOff/On (0x28-0x29), GetBiosChecksum (0x0D).
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The BIOS memory region (0x00000000-0x00003FFF, 16 KB) is allocated only if
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LoadBios() is called. Memory reads to this region return BIOS protection values
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(0x0E for 8-bit, 0xF00E for 16-bit, 0xE1B0F00E for 32-bit) when no BIOS is
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loaded and PC is outside the BIOS area.
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Bios000h() (entry point) initializes stack pointers and jumps to 0x08000004,
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matching real GBA hardware boot sequence. In the libretro port, retro_reset()
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resets all units except BIOS and ROM memory.
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files: []
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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: "ameteor/source/bios.cpp, ameteor/source/cpu.cpp:244-311"
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notes: |
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Full HLE BIOS. The libretro port never loads an external BIOS file.
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Cpu::SoftwareInterrupt() checks HasBios() -- if false (always in libretro),
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SWI calls are routed to C++ reimplementations. If a real BIOS were loaded
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(standalone only), execution would go through the actual BIOS ROM code via
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SoftwareInterrupt() -> branch to 0x08.
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