Mercurial > repos > blastem
annotate romdb.c @ 767:ea525f600b1d
SRAM detection from ROM header is no working correctly again
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 06 Jul 2015 19:46:46 -0700 |
parents | 1b2f8280ba81 |
children | 2f48a3c187c6 |
rev | line source |
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1 #include <stdlib.h> |
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2 #include <string.h> |
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3 #include "config.h" |
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4 #include "romdb.h" |
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5 #include "util.h" |
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6 #include "blastem.h" |
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7 |
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8 #define TITLE_START 0x150 |
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9 #define TITLE_END (TITLE_START+48) |
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10 #define GAME_ID_OFF 0x183 |
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11 #define GAME_ID_LEN 8 |
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12 #define ROM_END 0x1A4 |
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13 #define RAM_ID 0x1B0 |
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14 #define RAM_FLAGS 0x1B2 |
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15 #define RAM_START 0x1B4 |
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16 #define RAM_END 0x1B8 |
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17 #define REGION_START 0x1F0 |
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18 |
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19 uint16_t read_sram_w(uint32_t address, m68k_context * context) |
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20 { |
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21 genesis_context * gen = context->system; |
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22 address &= gen->save_ram_mask; |
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23 switch(gen->save_type) |
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24 { |
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25 case RAM_FLAG_BOTH: |
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26 return gen->save_storage[address] << 8 | gen->save_storage[address+1]; |
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27 case RAM_FLAG_EVEN: |
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28 return gen->save_storage[address >> 1] << 8 | 0xFF; |
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29 case RAM_FLAG_ODD: |
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30 return gen->save_storage[address >> 1] | 0xFF00; |
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31 } |
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32 return 0xFFFF;//We should never get here |
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33 } |
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34 |
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35 uint8_t read_sram_b(uint32_t address, m68k_context * context) |
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36 { |
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37 genesis_context * gen = context->system; |
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38 address &= gen->save_ram_mask; |
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39 switch(gen->save_type) |
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40 { |
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41 case RAM_FLAG_BOTH: |
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42 return gen->save_storage[address]; |
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43 case RAM_FLAG_EVEN: |
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44 if (address & 1) { |
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45 return 0xFF; |
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46 } else { |
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47 return gen->save_storage[address >> 1]; |
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48 } |
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49 case RAM_FLAG_ODD: |
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50 if (address & 1) { |
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51 return gen->save_storage[address >> 1]; |
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52 } else { |
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53 return 0xFF; |
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54 } |
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55 } |
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56 return 0xFF;//We should never get here |
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57 } |
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58 |
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59 m68k_context * write_sram_area_w(uint32_t address, m68k_context * context, uint16_t value) |
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60 { |
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61 genesis_context * gen = context->system; |
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62 if ((gen->bank_regs[0] & 0x3) == 1) { |
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63 address &= gen->save_ram_mask; |
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64 switch(gen->save_type) |
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65 { |
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66 case RAM_FLAG_BOTH: |
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67 gen->save_storage[address] = value >> 8; |
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68 gen->save_storage[address+1] = value; |
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69 break; |
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70 case RAM_FLAG_EVEN: |
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71 gen->save_storage[address >> 1] = value >> 8; |
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72 break; |
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73 case RAM_FLAG_ODD: |
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74 gen->save_storage[address >> 1] = value; |
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75 break; |
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76 } |
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77 } |
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78 return context; |
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79 } |
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80 |
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81 m68k_context * write_sram_area_b(uint32_t address, m68k_context * context, uint8_t value) |
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82 { |
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83 genesis_context * gen = context->system; |
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84 if ((gen->bank_regs[0] & 0x3) == 1) { |
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85 address &= gen->save_ram_mask; |
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86 switch(gen->save_type) |
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87 { |
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88 case RAM_FLAG_BOTH: |
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89 gen->save_storage[address] = value; |
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90 break; |
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91 case RAM_FLAG_EVEN: |
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92 if (!(address & 1)) { |
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93 gen->save_storage[address >> 1] = value; |
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94 } |
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95 break; |
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96 case RAM_FLAG_ODD: |
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765
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97 if (address & 1) { |
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98 gen->save_storage[address >> 1] = value; |
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99 } |
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100 break; |
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101 } |
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102 } |
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103 return context; |
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104 } |
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105 |
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106 m68k_context * write_bank_reg_w(uint32_t address, m68k_context * context, uint16_t value) |
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107 { |
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108 genesis_context * gen = context->system; |
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109 address &= 0xE; |
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110 address >>= 1; |
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111 gen->bank_regs[address] = value; |
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112 if (!address) { |
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113 if (value & 1) { |
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114 context->mem_pointers[2] = NULL; |
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115 } else { |
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116 context->mem_pointers[2] = cart + 0x200000/2; |
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117 } |
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118 } |
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119 return context; |
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120 } |
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121 |
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122 m68k_context * write_bank_reg_b(uint32_t address, m68k_context * context, uint8_t value) |
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123 { |
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124 if (address & 1) { |
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125 genesis_context * gen = context->system; |
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126 address &= 0xE; |
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127 address >>= 1; |
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128 gen->bank_regs[address] = value; |
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129 if (!address) { |
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130 if (value & 1) { |
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131 context->mem_pointers[2] = NULL; |
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132 } else { |
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133 context->mem_pointers[2] = cart + 0x200000/2; |
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134 } |
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135 } |
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136 } |
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137 return context; |
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138 } |
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139 |
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140 tern_node *load_rom_db() |
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141 { |
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142 char *exe_dir = get_exe_dir(); |
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143 if (!exe_dir) { |
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144 fputs("Failed to find executable path\n", stderr); |
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145 exit(1); |
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146 } |
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147 char *path = alloc_concat(exe_dir, "/rom.db"); |
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148 tern_node *db = parse_config_file(path); |
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149 free(path); |
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150 if (!db) { |
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151 fputs("Failed to load ROM DB\n", stderr); |
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152 } |
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153 return db; |
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154 } |
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155 |
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156 char *get_header_name(uint8_t *rom) |
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157 { |
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158 uint8_t *last = rom + TITLE_END - 1; |
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159 uint8_t *src = rom + TITLE_START; |
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160 |
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161 while (last > src && (*last <= 0x20 || *last >= 0x80)) |
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162 { |
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163 last--; |
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164 } |
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165 if (last == src) { |
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166 //TODO: Use other name field |
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167 return strdup("UNKNOWN"); |
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168 } else { |
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169 last++; |
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170 char *ret = malloc(last - (rom + TITLE_START) + 1); |
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171 uint8_t *dst; |
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172 for (dst = ret; src < last; src++) |
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173 { |
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174 if (*src >= 0x20 && *src < 0x80) { |
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175 *(dst++) = *src; |
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176 } |
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177 } |
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178 *dst = 0; |
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179 return ret; |
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180 } |
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181 } |
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182 |
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183 char *region_chars = "UB4JEA"; |
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184 uint8_t region_bits[] = {REGION_U, REGION_U, REGION_U, REGION_J, REGION_E, REGION_E}; |
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185 |
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186 uint8_t translate_region_char(uint8_t c) |
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187 { |
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188 for (int i = 0; i < sizeof(region_bits); i++) |
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189 { |
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190 if (c == region_chars[i]) { |
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191 return region_bits[i]; |
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192 } |
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193 } |
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194 return 0; |
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195 } |
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196 |
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197 uint8_t get_header_regions(uint8_t *rom) |
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198 { |
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199 uint8_t regions = 0; |
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200 for (int i = 0; i < 3; i++) |
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201 { |
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202 regions |= translate_region_char(rom[REGION_START + i]); |
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203 } |
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204 return regions; |
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205 } |
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206 |
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207 uint32_t get_u32be(uint8_t *data) |
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208 { |
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209 return *data << 24 | data[1] << 16 | data[2] << 8 | data[3]; |
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210 } |
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211 |
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212 void add_memmap_header(rom_info *info, uint8_t *rom, uint32_t size, memmap_chunk const *base_map, int base_chunks) |
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213 { |
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214 if (rom[RAM_ID] == 'R' && rom[RAM_ID+1] == 'A') { |
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215 uint32_t rom_end = get_u32be(rom + ROM_END) + 1; |
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216 uint32_t ram_start = get_u32be(rom + RAM_START); |
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217 uint32_t ram_end = get_u32be(rom + RAM_END); |
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218 uint32_t ram_flags = info->save_type = rom[RAM_FLAGS] & RAM_FLAG_MASK; |
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219 ram_start &= 0xFFFFFE; |
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220 ram_end |= 1; |
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221 info->save_mask = ram_end - ram_start; |
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222 uint32_t size = info->save_mask + 1; |
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223 if (ram_flags != RAM_FLAG_BOTH) { |
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224 size /= 2; |
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225 } |
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226 info->save_size = size; |
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227 info->save_buffer = malloc(size); |
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228 |
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229 info->map_chunks = base_chunks + (ram_start >= rom_end ? 2 : 3); |
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230 info->map = malloc(sizeof(memmap_chunk) * info->map_chunks); |
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231 memset(info->map, 0, sizeof(memmap_chunk)*2); |
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232 memcpy(info->map+2, base_map, sizeof(memmap_chunk) * base_chunks); |
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233 |
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234 if (ram_start >= rom_end) { |
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235 info->map[0].end = rom_end; |
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236 //TODO: ROM mirroring |
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237 info->map[0].mask = 0xFFFFFF; |
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238 info->map[0].flags = MMAP_READ; |
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239 info->map[0].buffer = rom; |
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240 |
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241 info->map[1].start = ram_start; |
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242 info->map[1].mask = info->save_mask; |
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243 info->map[1].end = ram_end + 1; |
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244 info->map[1].flags = MMAP_READ | MMAP_WRITE; |
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245 |
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246 if (ram_flags == RAM_FLAG_ODD) { |
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247 info->map[1].flags |= MMAP_ONLY_ODD; |
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248 } else if (ram_flags == RAM_FLAG_EVEN) { |
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249 info->map[1].flags |= MMAP_ONLY_EVEN; |
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250 } |
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251 info->map[1].buffer = info->save_buffer; |
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252 } else { |
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253 //Assume the standard Sega mapper |
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254 info->map[0].end = 0x200000; |
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255 info->map[0].mask = 0xFFFFFF; |
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256 info->map[0].flags = MMAP_READ; |
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257 info->map[0].buffer = rom; |
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258 |
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259 info->map[1].start = 0x200000; |
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260 info->map[1].end = 0x400000; |
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261 info->map[1].mask = 0x1FFFFF; |
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262 info->map[1].flags = MMAP_READ | MMAP_PTR_IDX | MMAP_FUNC_NULL; |
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263 info->map[1].ptr_index = 2; |
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264 info->map[1].read_16 = (read_16_fun)read_sram_w;//these will only be called when mem_pointers[2] == NULL |
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265 info->map[1].read_8 = (read_8_fun)read_sram_b; |
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266 info->map[1].write_16 = (write_16_fun)write_sram_area_w;//these will be called all writes to the area |
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267 info->map[1].write_8 = (write_8_fun)write_sram_area_b; |
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268 info->map[1].buffer = cart + 0x200000; |
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269 |
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270 memmap_chunk *last = info->map + info->map_chunks - 1; |
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271 memset(last, 0, sizeof(memmap_chunk)); |
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272 last->start = 0xA13000; |
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273 last->end = 0xA13100; |
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274 last->mask = 0xFF; |
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275 last->write_16 = (write_16_fun)write_bank_reg_w; |
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276 last->write_8 = (write_8_fun)write_bank_reg_b; |
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277 } |
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278 } else { |
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279 info->map_chunks = base_chunks + 1; |
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280 info->map = malloc(sizeof(memmap_chunk) * info->map_chunks); |
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281 memset(info->map, 0, sizeof(memmap_chunk)); |
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282 memcpy(info->map+1, base_map, sizeof(memmap_chunk) * base_chunks); |
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283 |
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284 info->map[0].end = 0x400000; |
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285 info->map[0].mask = 0xFFFFFF; |
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286 info->map[0].flags = MMAP_READ; |
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287 info->map[0].buffer = rom; |
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288 info->save_type = SAVE_NONE; |
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289 } |
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290 } |
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291 |
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292 rom_info configure_rom_heuristics(uint8_t *rom, uint32_t rom_size, memmap_chunk const *base_map, uint32_t base_chunks) |
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293 { |
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294 rom_info info; |
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295 info.name = get_header_name(rom); |
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296 info.regions = get_header_regions(rom); |
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297 add_memmap_header(&info, rom, rom_size, base_map, base_chunks); |
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298 return info; |
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299 } |
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300 |
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301 rom_info configure_rom(tern_node *rom_db, void *vrom, uint32_t rom_size, memmap_chunk const *base_map, uint32_t base_chunks) |
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302 { |
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303 uint8_t product_id[GAME_ID_LEN+1]; |
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304 uint8_t *rom = vrom; |
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305 product_id[GAME_ID_LEN] = 0; |
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306 for (int i = 0; i < GAME_ID_LEN; i++) |
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|
307 { |
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308 if (rom[GAME_ID_OFF + i] <= ' ') { |
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309 product_id[i] = 0; |
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|
310 break; |
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|
311 } |
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312 product_id[i] = rom[GAME_ID_OFF + i]; |
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|
313 |
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314 } |
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315 tern_node * entry = tern_find_prefix(rom_db, product_id); |
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316 if (!entry) { |
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317 return configure_rom_heuristics(rom, rom_size, base_map, base_chunks); |
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318 } |
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319 rom_info info; |
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320 info.name = tern_find_ptr(entry, "name"); |
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321 if (info.name) { |
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322 info.name = strdup(info.name); |
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323 } else { |
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324 info.name = get_header_name(rom); |
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325 } |
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326 |
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327 char *dbreg = tern_find_ptr(entry, "regions"); |
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328 info.regions = 0; |
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329 if (dbreg) { |
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330 while (*dbreg != 0) |
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331 { |
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332 info.regions |= translate_region_char(*(dbreg++)); |
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333 } |
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334 } |
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335 if (!info.regions) { |
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|
336 info.regions = get_header_regions(rom); |
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337 } |
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338 |
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|
339 tern_node *map = tern_find_prefix(entry, "map"); |
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|
340 if (map) { |
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|
341 uint32_t map_count = tern_count(map); |
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|
342 if (map_count) { |
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343 |
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344 } else { |
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|
345 add_memmap_header(&info, rom, rom_size, base_map, base_chunks); |
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346 } |
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|
347 } else { |
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|
348 add_memmap_header(&info, rom, rom_size, base_map, base_chunks); |
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changeset
|
349 } |
1b2f8280ba81
WIP changes to support reading cart memory map from ROM DB
Michael Pavone <pavone@retrodev.com>
parents:
765
diff
changeset
|
350 |
764
bb60259e8edf
Initial work on ROM database
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
351 return info; |
765
dc54387ee1cd
Allow regions to be set in ROM DB. Prefer default region if it is one of the valid regions for the ROM.
Michael Pavone <pavone@retrodev.com>
parents:
764
diff
changeset
|
352 } |