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annotate system.c @ 1116:fe8c79f82c22

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More cleanup in preparation for SMS/Mark III support
author Michael Pavone <pavone@retrodev.com>
date Thu, 22 Dec 2016 10:51:33 -0800
parents 2eb54e24914e
children 928a65750345
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1 #include <string.h>
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2 #include "system.h"
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3 #include "genesis.h"
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4
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5 system_type detect_system_type(uint8_t *rom, long filesize)
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6 {
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7 if (filesize >= 0x104 && !memcmp("SEGA", rom + 0x100, 4)) {
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8 //TODO: Differentiate between vanilla Genesis and Sega CD/32X games
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9 return SYSTEM_GENESIS;
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10 }
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11 //TODO: Detect SMS and Jaguar ROMs here
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12
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13 //More certain checks failed, look for a valid 68K reset vector
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14 if (filesize >= 8) {
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15 uint32_t reset = rom[4] << 24 | rom[5] << 16 | rom[6] << 8 | rom[7];
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16 if (!(reset & 1) && reset < filesize) {
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17 //we have a valid looking reset vector, assume it's a Genesis ROM
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18 return SYSTEM_GENESIS;
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19 }
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20 }
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21 return SYSTEM_UNKNOWN;
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22 }
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23
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24 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)
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25 {
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26 switch (stype)
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27 {
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28 case SYSTEM_GENESIS:
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29 return &(alloc_config_genesis(rom, rom_size, lock_on, lock_on_size, opts, force_region, info_out))->header;
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30 default:
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31 return NULL;
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32 }
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33 }