Mercurial > repos > blastem
diff romdb.c @ 777:79b10b421d3c
Support large flat-mapped ROMs like Bad Apple or that Mortal Kombat hack
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Mon, 20 Jul 2015 21:43:17 -0700 |
| parents | cbf97d335444 |
| children | ba38e36559b0 |
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--- a/romdb.c Mon Jul 20 21:15:34 2015 -0700 +++ b/romdb.c Mon Jul 20 21:43:17 2015 -0700 @@ -478,20 +478,25 @@ void add_memmap_header(rom_info *info, uint8_t *rom, uint32_t size, memmap_chunk const *base_map, int base_chunks) { + uint32_t rom_end = get_u32be(rom + ROM_END) + 1; + if (size > rom_end) { + rom_end = size; + } else if (rom_end > nearest_pow2(size)) { + rom_end = nearest_pow2(size); + } if (rom[RAM_ID] == 'R' && rom[RAM_ID+1] == 'A') { - uint32_t rom_end = get_u32be(rom + ROM_END) + 1; uint32_t ram_start = get_u32be(rom + RAM_START); uint32_t ram_end = get_u32be(rom + RAM_END); uint32_t ram_flags = info->save_type = rom[RAM_FLAGS] & RAM_FLAG_MASK; ram_start &= 0xFFFFFE; ram_end |= 1; info->save_mask = ram_end - ram_start; - uint32_t size = info->save_mask + 1; + uint32_t save_size = info->save_mask + 1; if (ram_flags != RAM_FLAG_BOTH) { - size /= 2; + save_size /= 2; } - info->save_size = size; - info->save_buffer = malloc(size); + info->save_size = save_size; + info->save_buffer = malloc(save_size); info->map_chunks = base_chunks + (ram_start >= rom_end ? 2 : 3); info->map = malloc(sizeof(memmap_chunk) * info->map_chunks); @@ -499,7 +504,7 @@ memcpy(info->map+2, base_map, sizeof(memmap_chunk) * base_chunks); if (ram_start >= rom_end) { - info->map[0].end = rom_end; + info->map[0].end = rom_end > 0x400000 ? rom_end : 0x400000; //TODO: ROM mirroring info->map[0].mask = 0xFFFFFF; info->map[0].flags = MMAP_READ; @@ -548,7 +553,7 @@ memset(info->map, 0, sizeof(memmap_chunk)); memcpy(info->map+1, base_map, sizeof(memmap_chunk) * base_chunks); - info->map[0].end = 0x400000; + info->map[0].end =rom_end > 0x400000 ? rom_end : 0x400000; info->map[0].mask = 0xFFFFFF; info->map[0].flags = MMAP_READ; info->map[0].buffer = rom;