Mercurial > repos > blastem
diff system.c @ 1111:2eb54e24914e
Mostly working changes to allow support for multiple emulated system types in main blastem program
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 19 Dec 2016 13:28:18 -0800 |
parents | |
children | 928a65750345 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/system.c Mon Dec 19 13:28:18 2016 -0800 @@ -0,0 +1,33 @@ +#include <string.h> +#include "system.h" +#include "genesis.h" + +system_type detect_system_type(uint8_t *rom, long filesize) +{ + if (filesize >= 0x104 && !memcmp("SEGA", rom + 0x100, 4)) { + //TODO: Differentiate between vanilla Genesis and Sega CD/32X games + return SYSTEM_GENESIS; + } + //TODO: Detect SMS and Jaguar ROMs here + + //More certain checks failed, look for a valid 68K reset vector + if (filesize >= 8) { + uint32_t reset = rom[4] << 24 | rom[5] << 16 | rom[6] << 8 | rom[7]; + if (!(reset & 1) && reset < filesize) { + //we have a valid looking reset vector, assume it's a Genesis ROM + return SYSTEM_GENESIS; + } + } + return SYSTEM_UNKNOWN; +} + +system_header *alloc_config_system(system_type stype, void *rom, uint32_t rom_size, void *lock_on, uint32_t lock_on_size, uint32_t opts, uint8_t force_region, rom_info *info_out) +{ + switch (stype) + { + case SYSTEM_GENESIS: + return &(alloc_config_genesis(rom, rom_size, lock_on, lock_on_size, opts, force_region, info_out))->header; + default: + return NULL; + } +}