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annotate system.c @ 2413:64cf80e683aa

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Initial support for Colecovision emulation
author Michael Pavone <pavone@retrodev.com>
date Thu, 04 Jan 2024 22:56:35 -0800
parents 92449b47cce8
children 65c2e4d990cc
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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 #include "mediaplayer.h"
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7 #include "coleco.h"
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8
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9 uint8_t safe_cmp(char *str, long offset, uint8_t *buffer, long filesize)
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10 {
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11 long len = strlen(str);
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12 return filesize >= offset+len && !memcmp(str, buffer + offset, len);
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13 }
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14
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15 system_type detect_system_type(system_media *media)
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16 {
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17 if (safe_cmp("SEGA", 0x100, media->buffer, media->size)) {
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18 //TODO: support other bootable identifiers
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19 if (safe_cmp("SEGADISCSYSTEM", 0, media->buffer, media->size)) {
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20 return SYSTEM_SEGACD;
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21 }
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22 //TODO: Differentiate between vanilla Genesis and 32X games
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23 return SYSTEM_GENESIS;
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24 }
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25 if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size)
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26 || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size)
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27 || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size)
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28 ) {
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29 return SYSTEM_SMS;
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30 }
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31 if (safe_cmp("BLSTEL\x02", 0, media->buffer, media->size)) {
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32 uint8_t *buffer = media->buffer;
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33 if (media->size > 9 && buffer[7] == 0) {
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34 return buffer[8] + 1;
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35 }
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36 }
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37 if (
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38 safe_cmp("Vgm ", 0, media->buffer, media->size)
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39 || safe_cmp("RIFF", 0, media->buffer, media->size)
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40 || safe_cmp("fLaC", 0, media->buffer, media->size)) {
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41 return SYSTEM_MEDIA_PLAYER;
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42 }
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43 if (
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44 (safe_cmp("\xAA\x55", 0, media->buffer, media->size)
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45 || safe_cmp("\x55\xAA", 0, media->buffer, media->size))
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46 && media->size > 0xB) {
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47 uint8_t *buffer = media->buffer;
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48 if (((buffer[0xB] << 8) | buffer[0xA]) > 0x8000) {
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49 return SYSTEM_COLECOVISION;
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50 }
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51 }
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52
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53
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54 //TODO: Detect Jaguar ROMs here
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55
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56 //Header based detection failed, examine filename for clues
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57 if (media->extension) {
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58 if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) {
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59 return SYSTEM_GENESIS;
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60 }
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61 if (!strcmp("sms", media->extension) || !strcmp("sg", media->extension) || !strcmp("gg", media->extension)) {
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62 return SYSTEM_SMS;
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63 }
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64 if (!strcmp("j64", media->extension)) {
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65 return SYSTEM_JAGUAR;
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66 }
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67 if (!strcmp("col", media->extension)) {
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68 return SYSTEM_COLECOVISION;
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69 }
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70 }
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71
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72 //More certain checks failed, look for a valid 68K reset vector
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73 if (media->size >= 8) {
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74 char *rom = media->buffer;
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75 uint32_t reset = rom[5] << 16 | rom[6] << 8 | rom[7];
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76 if (!(reset & 1) && reset < media->size) {
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77 //we have a valid looking reset vector, assume it's a Genesis ROM
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78 return SYSTEM_GENESIS;
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79 }
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80 }
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81 return SYSTEM_UNKNOWN;
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82 }
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83
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84 system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region)
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85 {
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86 void *lock_on = NULL;
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87 uint32_t lock_on_size = 0;
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88 if (media->chain) {
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89 lock_on = media->chain->buffer;
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90 lock_on_size = media->chain->size;
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91 }
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92 switch (stype)
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93 {
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94 case SYSTEM_GENESIS:
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95 return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header;
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96 case SYSTEM_GENESIS_PLAYER:
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97 return &(alloc_config_gen_player(media->buffer, media->size))->header;
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98 case SYSTEM_SEGACD:
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99 return &(alloc_config_genesis_cdboot(media, opts, force_region))->header;
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100 #ifndef NO_Z80
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101 case SYSTEM_SMS:
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102 return &(alloc_configure_sms(media, opts, force_region))->header;
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103 case SYSTEM_COLECOVISION:
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104 return &(alloc_configure_coleco(media))->header;
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105 #endif
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106 case SYSTEM_MEDIA_PLAYER:
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107 return &(alloc_media_player(media, opts))->header;
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108 default:
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109 return NULL;
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110 }
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111 }
1946
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112
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113 system_header *alloc_config_player(system_type stype, event_reader *reader)
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114 {
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115 switch(stype)
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116 {
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117 case SYSTEM_GENESIS:
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118 return &(alloc_config_gen_player_reader(reader))->header;
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119 }
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120 return NULL;
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121 }
1980
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122
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123 void system_request_exit(system_header *system, uint8_t force_release)
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124 {
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125 system->force_release = force_release;
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126 system->request_exit(system);
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127 }