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annotate system.c @ 2257:1e626d0ecf9c

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WIP SG-1000/TMS9918A mode support
author Michael Pavone <pavone@retrodev.com>
date Sat, 17 Dec 2022 23:32:34 -0800
parents 3414a4423de1
children 92449b47cce8
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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 #include "gen_player.h"
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5 #include "sms.h"
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6
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7 uint8_t safe_cmp(char *str, long offset, uint8_t *buffer, long filesize)
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8 {
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9 long len = strlen(str);
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10 return filesize >= offset+len && !memcmp(str, buffer + offset, len);
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11 }
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12
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13 system_type detect_system_type(system_media *media)
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14 {
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15 if (safe_cmp("SEGA", 0x100, media->buffer, media->size)) {
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16 //TODO: support other bootable identifiers
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17 if (safe_cmp("SEGADISCSYSTEM", 0, media->buffer, media->size)) {
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18 return SYSTEM_SEGACD;
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19 }
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20 //TODO: Differentiate between vanilla Genesis and 32X games
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21 return SYSTEM_GENESIS;
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22 }
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23 if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size)
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24 || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size)
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25 || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size)
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26 ) {
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27 return SYSTEM_SMS;
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28 }
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29 if (safe_cmp("BLSTEL\x02", 0, media->buffer, media->size)) {
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30 uint8_t *buffer = media->buffer;
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31 if (media->size > 9 && buffer[7] == 0) {
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32 return buffer[8] + 1;
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33 }
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34 }
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35
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36
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37 //TODO: Detect Jaguar ROMs here
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38
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39 //Header based detection failed, examine filename for clues
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40 if (media->extension) {
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41 if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) {
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42 return SYSTEM_GENESIS;
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43 }
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44 if (!strcmp("sms", media->extension) || !strcmp("sg", media->extension) || !strcmp("gg", media->extension)) {
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45 return SYSTEM_SMS;
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46 }
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47 if (!strcmp("j64", media->extension)) {
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48 return SYSTEM_JAGUAR;
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49 }
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50 }
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51
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52 //More certain checks failed, look for a valid 68K reset vector
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53 if (media->size >= 8) {
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54 char *rom = media->buffer;
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55 uint32_t reset = rom[5] << 16 | rom[6] << 8 | rom[7];
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56 if (!(reset & 1) && reset < media->size) {
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57 //we have a valid looking reset vector, assume it's a Genesis ROM
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58 return SYSTEM_GENESIS;
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59 }
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60 }
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61 return SYSTEM_UNKNOWN;
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62 }
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63
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64 system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region)
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65 {
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66 void *lock_on = NULL;
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67 uint32_t lock_on_size = 0;
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68 if (media->chain) {
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69 lock_on = media->chain->buffer;
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70 lock_on_size = media->chain->size;
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71 }
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72 switch (stype)
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73 {
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74 case SYSTEM_GENESIS:
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75 return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header;
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76 case SYSTEM_GENESIS_PLAYER:
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77 return &(alloc_config_gen_player(media->buffer, media->size))->header;
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78 case SYSTEM_SEGACD:
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79 return &(alloc_config_genesis_cdboot(media, opts, force_region))->header;
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80 #ifndef NO_Z80
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81 case SYSTEM_SMS:
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82 return &(alloc_configure_sms(media, opts, force_region))->header;
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83 #endif
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84 default:
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85 return NULL;
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86 }
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87 }
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88
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89 system_header *alloc_config_player(system_type stype, event_reader *reader)
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90 {
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91 switch(stype)
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92 {
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93 case SYSTEM_GENESIS:
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94 return &(alloc_config_gen_player_reader(reader))->header;
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95 }
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96 return NULL;
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97 }
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98
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99 void system_request_exit(system_header *system, uint8_t force_release)
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100 {
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101 system->force_release = force_release;
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102 system->request_exit(system);
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103 }