diff options
| author | Michael Pavone <pavone@retrodev.com> | 2017-03-19 00:34:15 -0700 |
|---|---|---|
| committer | Michael Pavone <pavone@retrodev.com> | 2017-03-19 00:34:15 -0700 |
| commit | fd02b79c626327abdc999a39a5c78560ebc5d2f1 (patch) | |
| tree | 014255b10c80ec923c4655ddf9801770577bc608 | |
| parent | 64f0b10ed617f4fbfcfc93625b8ca09a44f58615 (diff) | |
Add Mega Everdrive style header detection for homebrew using the SSF2 mapper, though without the Mega Everdrive extensions. Properly invalidate translated code on a bank switch when using the SSF2/Sega mapper
| -rw-r--r-- | romdb.c | 35 |
1 files changed, 32 insertions, 3 deletions
@@ -295,6 +295,7 @@ m68k_context * write_bank_reg_w(uint32_t address, m68k_context * context, uint16 } } } else { + m68k_invalidate_code_range(gen->m68k, address * 0x80000, (address + 1) * 0x80000); context->mem_pointers[gen->mapper_start_index + address] = gen->cart + 0x40000*value; } return context; @@ -508,7 +509,35 @@ void add_memmap_header(rom_info *info, uint8_t *rom, uint32_t size, memmap_chunk } else if (rom_end > nearest_pow2(size)) { rom_end = nearest_pow2(size); } - if (rom[RAM_ID] == 'R' && rom[RAM_ID+1] == 'A') { + if (size >= 0x80000 && !memcmp("SEGA SSF", rom + 0x100, 8)) { + info->mapper_start_index = 0; + info->map_chunks = base_chunks + 9; + info->map = malloc(sizeof(memmap_chunk) * info->map_chunks); + memset(info->map, 0, sizeof(memmap_chunk)*9); + memcpy(info->map+9, base_map, sizeof(memmap_chunk) * base_chunks); + + info->map[0].start = 0; + info->map[0].end = 0x80000; + info->map[0].mask = 0xFFFFFF; + info->map[0].flags = MMAP_READ; + info->map[0].buffer = rom; + + for (int i = 1; i < 8; i++) + { + info->map[i].start = i * 0x80000; + info->map[i].end = (i + 1) * 0x80000; + info->map[i].mask = 0x7FFFF; + info->map[i].buffer = (i + 1) * 0x80000 <= size ? rom + i * 0x80000 : rom; + info->map[i].ptr_index = i; + info->map[i].flags = MMAP_READ | MMAP_PTR_IDX | MMAP_CODE; + + } + info->map[8].start = 0xA13000; + info->map[8].end = 0xA13100; + info->map[8].mask = 0xFF; + info->map[8].write_16 = (write_16_fun)write_bank_reg_w; + info->map[8].write_8 = (write_8_fun)write_bank_reg_b; + } else if (rom[RAM_ID] == 'R' && rom[RAM_ID+1] == 'A') { 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; @@ -799,9 +828,9 @@ void map_iter_fun(char *key, tern_val val, void *data) map->buffer = state->rom + offset + i * 0x80000; map->ptr_index = state->ptr_index++; if (i < 3 || !save_device) { - map->flags = MMAP_READ | MMAP_PTR_IDX; + map->flags = MMAP_READ | MMAP_PTR_IDX | MMAP_CODE; } else { - map->flags = MMAP_READ | MMAP_PTR_IDX | MMAP_FUNC_NULL; + map->flags = MMAP_READ | MMAP_PTR_IDX | MMAP_CODE | MMAP_FUNC_NULL; if (!strcmp(save_device, "SRAM")) { process_sram_def(key, state); map->read_16 = (read_16_fun)read_sram_w;//these will only be called when mem_pointers[2] == NULL |