Mercurial > repos > blastem
annotate xband.c @ 1228:2e6dcb5c11a2
WIP support for XBAND mapper hardware
author | Michael Pavone <pavone@retrodev.com> |
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date | Thu, 23 Feb 2017 00:08:37 -0800 |
parents | |
children | a8313793216a |
rev | line source |
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1228
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1 #include <stdlib.h> |
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2 #include <stddef.h> |
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3 #include <string.h> |
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4 #include "romdb.h" |
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5 #include "genesis.h" |
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6 #include "tern.h" |
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7 #include "xband.h" |
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8 #include "util.h" |
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9 |
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10 #define BIT_ROM_HI 4 |
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11 |
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12 uint8_t xband_detect(uint8_t *rom, uint32_t rom_size) |
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13 { |
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14 //Internal ROM is 512KB, accept larger ones for overdumps and custom firmware |
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15 if (rom_size < (512*1024)) { |
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16 return 0; |
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17 } |
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18 |
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19 //ROM has no standard header, but does have a jump at $100 |
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20 if (rom[0x100] != 0x4E || rom[0x101] != 0xF9) { |
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21 return 0; |
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22 } |
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23 |
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24 //product ID is all NULL |
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25 for (int i = GAME_ID_OFF; i <= (GAME_ID_OFF + GAME_ID_LEN); i++) |
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26 { |
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27 if (rom[i]) { |
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28 return 0; |
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29 } |
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30 } |
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31 return 1; |
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32 } |
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33 |
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34 static xband *get_xband(genesis_context *gen) |
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35 { |
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36 if (!gen->extra) { |
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37 gen->extra = gen->m68k->options->gen.memmap[0].buffer; |
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38 gen->m68k->mem_pointers[2] = (uint16_t *)gen->save_storage; |
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39 } |
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40 return gen->extra; |
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41 } |
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42 |
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43 static void update_control(genesis_context *gen, uint8_t value) |
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44 { |
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45 xband *x = gen->extra; |
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46 if ((x->control ^ value) & BIT_ROM_HI) { |
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47 if (value & BIT_ROM_HI) { |
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48 gen->m68k->mem_pointers[0] = (uint16_t *)gen->save_storage; |
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49 gen->m68k->mem_pointers[1] = NULL; |
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50 gen->m68k->mem_pointers[2] = x->cart_space; |
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51 gen->m68k->mem_pointers[3] = x->cart_space - 0x100000; |
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52 } else { |
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53 gen->m68k->mem_pointers[0] = x->cart_space; |
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54 gen->m68k->mem_pointers[1] = x->cart_space; |
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55 gen->m68k->mem_pointers[2] = (uint16_t *)gen->save_storage; |
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56 gen->m68k->mem_pointers[3] = NULL; |
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57 } |
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58 m68k_invalidate_code_range(gen->m68k, 0, 0x3BC000); |
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59 } |
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60 x->control = value; |
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61 } |
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62 |
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63 static void *xband_write_b(uint32_t address, void *context, uint8_t value) |
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64 { |
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65 m68k_context *m68k = context; |
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66 genesis_context *gen = m68k->system; |
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67 xband *x = get_xband(gen); |
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68 if (address == 0x181) { |
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69 x->kill = value; |
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70 printf("Write to \"soft\" kill register %X\n", value); |
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71 } else if (address == 0x183) { |
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72 update_control(gen, value); |
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73 printf("Write to \"soft\" control register %X\n", value); |
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74 } else if ((x->control & BIT_ROM_HI && address < 0x200000) || (address >= 0x200000 && !(x->control & BIT_ROM_HI))) { |
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75 gen->save_storage[(address & 0xFFFF) ^ 1] = value; |
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76 m68k_handle_code_write(address, m68k); |
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77 //TODO: handle code at mirror addresses |
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78 } else { |
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79 printf("Unhandled write to cartridge area %X: %X\n", address, value); |
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80 } |
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81 return context; |
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82 } |
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83 |
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84 static void *xband_write_hi_b(uint32_t address, void *context, uint8_t value) |
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85 { |
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86 return xband_write_b(address | 0x200000, context, value); |
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87 } |
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88 |
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89 static void *xband_write_w(uint32_t address, void *context, uint16_t value) |
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90 { |
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91 m68k_context *m68k = context; |
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92 genesis_context *gen = m68k->system; |
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93 xband *x = get_xband(gen); |
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94 if (address == 0x180 || address == 0x182) { |
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95 return xband_write_b(address | 1, context, value); |
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96 } else if ((x->control & BIT_ROM_HI && address < 0x200000) || (address >= 0x200000 && !(x->control & BIT_ROM_HI))) { |
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97 gen->save_storage[address & 0xFFFE] = value; |
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98 gen->save_storage[(address & 0xFFFE) | 1] = value >> 8; |
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99 m68k_handle_code_write(address, m68k); |
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100 //TODO: handle code at mirror addresses |
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101 return context; |
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102 } |
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103 printf("Unhandled write to %X: %X\n", address, value); |
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104 return context; |
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105 } |
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106 |
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107 static void *xband_write_hi_w(uint32_t address, void *context, uint16_t value) |
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108 { |
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109 return xband_write_w(address | 0x200000, context, value); |
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110 } |
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111 |
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112 static uint16_t xband_read_w(uint32_t address, void *context) |
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113 { |
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114 m68k_context *m68k = context; |
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115 genesis_context *gen = m68k->system; |
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116 xband *x = get_xband(gen); |
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117 //TODO: actually do something intelligent here |
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118 return x->cart_space[address >> 1]; |
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119 } |
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120 |
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121 static uint16_t xband_read_hi_w(uint32_t address, void *context) |
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122 { |
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123 return xband_read_w(address | 0x200000, context); |
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124 } |
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125 |
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126 static uint8_t xband_read_b(uint32_t address, void *context) |
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127 { |
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128 uint16_t val = xband_read_w(address, context); |
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129 return address & 1 ? val : val >> 8; |
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130 } |
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131 |
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132 static uint8_t xband_read_hi_b(uint32_t address, void *context) |
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133 { |
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134 return xband_read_b(address | 0x200000, context); |
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135 } |
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136 |
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137 static void *xband_reg_write_b(uint32_t address, void *context, uint8_t value) |
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138 { |
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139 m68k_context *m68k = context; |
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140 genesis_context *gen = m68k->system; |
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141 if (!(address & 1)) { |
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142 printf("Ignoring write to even address %X: %X\n", address, value); |
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143 return context; |
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144 } |
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145 xband *x = get_xband(gen); |
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146 if (address < 0x3BFE00) { |
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147 uint32_t offset = (address - 0x3BC001) / 2; |
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148 if (offset < XBAND_REGS) { |
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149 x->regs[offset] = value; |
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150 printf("Write to register %X: %X\n", address, value); |
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151 } else { |
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152 printf("Unhandled register write %X: %X\n", address, value); |
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153 } |
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154 } else { |
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155 if (address == 0x3BFE01) { |
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156 x->kill = value; |
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157 printf("Write to kill register %X\n", value); |
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158 } else if (address == 0x3BFE03) { |
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159 update_control(gen, value); |
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160 printf("Write to control register %X\n", value); |
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161 } else { |
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162 printf("Unhandled register write %X: %X\n", address, value); |
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163 } |
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164 } |
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165 return context; |
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166 } |
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167 |
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168 static void *xband_reg_write_w(uint32_t address, void *context, uint16_t value) |
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169 { |
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170 return xband_reg_write_b(address | 1, context, value); |
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171 } |
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172 |
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173 static uint8_t xband_reg_read_b(uint32_t address, void *context) |
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174 { |
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175 m68k_context *m68k = context; |
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176 genesis_context *gen = m68k->system; |
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177 if (!(address & 1)) { |
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178 printf("Read from even address %X\n", address); |
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179 return gen->header.get_open_bus_value(&gen->header) >> 8; |
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180 } |
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181 xband *x = get_xband(gen); |
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182 if (address < 0x3BFE00) { |
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183 uint32_t offset = (address - 0x3BC001) / 2; |
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184 if (offset < XBAND_REGS) { |
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185 return x->regs[offset]; |
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186 } else { |
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187 printf("Unhandled register read from address %X\n", address); |
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188 return 0x5D; |
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189 } |
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190 } else { |
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191 if (address == 0x3BFE01) { |
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192 return x->kill; |
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193 } else if (address == 0x3BFE03) { |
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194 return x->control; |
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195 } else { |
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196 printf("Unhandled register read from address %X\n", address); |
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197 return 0x5D; |
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198 } |
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199 } |
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200 } |
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201 |
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202 static uint16_t xband_reg_read_w(uint32_t address, void *context) |
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203 { |
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204 m68k_context *m68k = context; |
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205 genesis_context *gen = m68k->system; |
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206 uint16_t value = xband_reg_read_b(address | 1, context); |
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207 value |= gen->header.get_open_bus_value(&gen->header) & 0xFF00; |
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208 return value; |
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209 } |
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210 |
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211 rom_info xband_configure_rom(tern_node *rom_db, void *rom, uint32_t rom_size, void *lock_on, uint32_t lock_on_size, memmap_chunk const *base_map, uint32_t base_chunks) |
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212 { |
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213 rom_info info; |
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214 if (lock_on && lock_on_size) { |
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215 rom_info lock_on_info = configure_rom(rom_db, lock_on, lock_on_size, NULL, 0, base_map, base_chunks); |
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216 info.name = alloc_concat("XBAND - ", lock_on_info.name); |
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217 info.regions = lock_on_info.regions; |
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218 //TODO: Move this to a shared function in romdbc.h |
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219 free(lock_on_info.name); |
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220 if (lock_on_info.save_type != SAVE_NONE) { |
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221 free(lock_on_info.save_buffer); |
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222 if (lock_on_info.save_type == SAVE_I2C) { |
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223 free(lock_on_info.eeprom_map); |
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224 } |
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225 } |
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226 free(lock_on_info.map); |
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227 free(lock_on_info.port1_override); |
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228 free(lock_on_info.port2_override); |
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229 free(lock_on_info.ext_override); |
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230 free(lock_on_info.mouse_mode); |
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231 } else { |
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232 info.name = strdup("XBAND"); |
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233 info.regions = REGION_J|REGION_U|REGION_E; |
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234 } |
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235 info.save_size = 64*1024; |
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236 info.save_buffer = malloc(info.save_size); |
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237 info.save_mask = info.save_size-1; |
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238 info.save_type = RAM_FLAG_BOTH; |
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239 info.port1_override = info.port2_override = info.ext_override = info.mouse_mode = NULL; |
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240 info.eeprom_map = NULL; |
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241 info.num_eeprom = 0; |
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242 xband *x = calloc(sizeof(xband), 1); |
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243 rom_size = nearest_pow2(rom_size); |
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244 for (int i = 0; (i + rom_size) <= sizeof(x->cart_space) / 2; i += rom_size) |
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245 { |
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246 memcpy(x->cart_space + i/2, rom, rom_size); |
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247 } |
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248 if (lock_on && lock_on_size >= 0x200) { |
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249 memcpy(x->cart_space + 0x80, ((uint16_t *)lock_on) + 0x80, 0x100); |
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250 } |
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251 byteswap_rom(0x400000, x->cart_space); |
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252 |
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253 info.map_chunks = base_chunks + 5; |
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254 info.map = calloc(sizeof(memmap_chunk), info.map_chunks); |
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255 info.map[0].mask = 0xFFFFFF; |
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256 info.map[0].aux_mask = 0xFFFFFF; |
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257 info.map[0].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX|MMAP_FUNC_NULL|MMAP_AUX_BUFF; |
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258 info.map[0].start = 0; |
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259 info.map[0].end = 0x10000; |
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260 info.map[0].ptr_index = 0; |
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261 info.map[0].buffer = x->cart_space; |
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262 info.map[0].write_16 = xband_write_w; |
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263 info.map[0].write_8 = xband_write_b; |
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264 info.map[0].read_16 = xband_read_w; |
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265 info.map[0].read_8 = xband_read_b; |
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266 info.map[1].mask = 0xFFFFFF; |
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267 info.map[1].aux_mask = 0xFFFFFF; |
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268 info.map[1].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX|MMAP_FUNC_NULL|MMAP_AUX_BUFF; |
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269 info.map[1].start = 0x10000; |
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270 info.map[1].end = 0x200000; |
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271 info.map[1].ptr_index = 1; |
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272 info.map[1].buffer = x->cart_space; |
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273 info.map[1].write_16 = xband_write_w; |
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274 info.map[1].write_8 = xband_write_b; |
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275 info.map[1].read_16 = xband_read_w; |
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276 info.map[1].read_8 = xband_read_b; |
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277 info.map[2].mask = 0xFFFF; |
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278 info.map[2].aux_mask = 0xFFFF; |
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279 info.map[2].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX|MMAP_FUNC_NULL; |
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280 info.map[2].start = 0x200000; |
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281 info.map[2].end = 0x210000; |
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282 info.map[2].ptr_index = 2; |
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283 info.map[2].buffer = NULL; |
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284 info.map[2].write_16 = xband_write_hi_w; |
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285 info.map[2].write_8 = xband_write_hi_b; |
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286 info.map[2].read_16 = xband_read_hi_w; |
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287 info.map[2].read_8 = xband_read_hi_b; |
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288 info.map[3].mask = 0xFFFFFF; |
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289 info.map[3].aux_mask = 0xFFFFFF; |
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290 info.map[3].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX|MMAP_FUNC_NULL; |
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291 info.map[3].start = 0x210000; |
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292 info.map[3].end = 0x3BC000; |
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293 info.map[3].ptr_index = 3; |
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294 info.map[3].buffer = NULL; |
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295 info.map[3].write_16 = xband_write_w; |
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296 info.map[3].write_8 = xband_write_b; |
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297 info.map[3].read_16 = xband_read_w; |
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298 info.map[3].read_8 = xband_read_b; |
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299 info.map[4].mask = 0xFFFFFF; |
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300 info.map[4].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX|MMAP_FUNC_NULL; |
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301 info.map[4].start = 0x3BC000; |
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302 info.map[4].end = 0x3C0000; |
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303 info.map[4].ptr_index = 4; |
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304 info.map[4].write_16 = xband_reg_write_w; |
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305 info.map[4].write_8 = xband_reg_write_b; |
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306 info.map[4].read_16 = xband_reg_read_w; |
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307 info.map[4].read_8 = xband_reg_read_b; |
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308 memcpy(info.map + 5, base_map, base_chunks * sizeof(memmap_chunk)); |
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309 |
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310 return info; |
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311 } |