Mercurial > repos > blastem
annotate xband.c @ 1230:0ed27bb6a658
Awful hack to get the XBAND menu booting
author | Michael Pavone <pavone@retrodev.com> |
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date | Fri, 24 Feb 2017 00:08:52 -0800 |
parents | a8313793216a |
children | d9d775d61fcf |
rev | line source |
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1228
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
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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 |
1230
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Awful hack to get the XBAND menu booting
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12 enum { |
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Awful hack to get the XBAND menu booting
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13 PATCH0_LOW, |
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Awful hack to get the XBAND menu booting
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14 PATCH0_MID, |
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Awful hack to get the XBAND menu booting
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parents:
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15 PATCH0_HI, |
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Awful hack to get the XBAND menu booting
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16 PATCH1_LOW=4, |
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Awful hack to get the XBAND menu booting
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parents:
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17 PATCH1_MID, |
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Awful hack to get the XBAND menu booting
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parents:
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18 PATCH1_HI, |
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Awful hack to get the XBAND menu booting
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19 PATCH2_LOW=8, |
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Awful hack to get the XBAND menu booting
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20 PATCH2_MID, |
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Awful hack to get the XBAND menu booting
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21 PATCH2_HI, |
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Awful hack to get the XBAND menu booting
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22 PATCH3_LOW=12, |
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23 PATCH3_MID, |
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Awful hack to get the XBAND menu booting
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24 PATCH3_HI, |
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Awful hack to get the XBAND menu booting
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25 PATCH4_LOW=16, |
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26 PATCH4_MID, |
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27 PATCH4_HI, |
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28 PATCH5_LOW=20, |
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Awful hack to get the XBAND menu booting
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29 PATCH5_MID, |
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Awful hack to get the XBAND menu booting
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30 PATCH5_HI, |
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31 PATCH6_LOW=24, |
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32 PATCH6_MID, |
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Awful hack to get the XBAND menu booting
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33 PATCH6_HI, |
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34 PATCH7_LOW=28, |
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Awful hack to get the XBAND menu booting
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35 PATCH7_MID, |
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Awful hack to get the XBAND menu booting
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parents:
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36 PATCH7_HI, |
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Awful hack to get the XBAND menu booting
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37 PATCH8_LOW=32, |
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Awful hack to get the XBAND menu booting
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38 PATCH8_MID, |
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Awful hack to get the XBAND menu booting
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39 PATCH8_HI, |
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Awful hack to get the XBAND menu booting
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40 PATCH9_LOW=36, |
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Awful hack to get the XBAND menu booting
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41 PATCH9_MID, |
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Awful hack to get the XBAND menu booting
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parents:
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42 PATCH9_HI, |
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Awful hack to get the XBAND menu booting
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parents:
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43 PATCH10_LOW=40, |
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Awful hack to get the XBAND menu booting
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parents:
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44 PATCH10_MID, |
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Awful hack to get the XBAND menu booting
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45 PATCH10_HI, |
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Awful hack to get the XBAND menu booting
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46 RANGE0_START_LOW=44, |
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47 RANGE0_START_MID, |
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48 RANGE0_START_HI, |
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parents:
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49 RANGE1_START=48, |
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50 RANGE1_START_MID, |
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51 RANGE1_START_HI, |
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52 MAGIC_LOW=56, |
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Awful hack to get the XBAND menu booting
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53 MAGIC_MID, |
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Awful hack to get the XBAND menu booting
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54 MAGIC_HI, |
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55 RANGE0_END_LOW=64, |
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56 RANGE0_END_MID, |
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57 RANGE0_END_HI, |
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Awful hack to get the XBAND menu booting
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58 RANGE1_END_LOW=68, |
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Awful hack to get the XBAND menu booting
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59 RANGE1_END_MID, |
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parents:
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60 RANGE1_END_HI, |
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61 RANGE0_DEST_LOW=80, |
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Awful hack to get the XBAND menu booting
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62 RANGE0_DEST_HI, |
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63 RANGE0_MASK, |
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64 RANGE1_DEST_LOW=84, |
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65 RANGE1_DEST_HI, |
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66 RANGE1_MASK, |
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67 |
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68 MORE_MYSTERY=219, |
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69 UNKNOWN_REG=221, |
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70 UNKNOWN_REG2, |
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71 UNKNOWN_REG3, |
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72 |
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73 }; |
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74 |
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75 uint8_t xband_detect(uint8_t *rom, uint32_t rom_size) |
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76 { |
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77 //Internal ROM is 512KB, accept larger ones for overdumps and custom firmware |
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78 if (rom_size < (512*1024)) { |
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79 return 0; |
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80 } |
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81 |
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82 //ROM has no standard header, but does have a jump at $100 |
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83 if (rom[0x100] != 0x4E || rom[0x101] != 0xF9) { |
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84 return 0; |
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85 } |
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86 |
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87 //product ID is all NULL |
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88 for (int i = GAME_ID_OFF; i <= (GAME_ID_OFF + GAME_ID_LEN); i++) |
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89 { |
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90 if (rom[i]) { |
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91 return 0; |
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92 } |
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93 } |
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94 return 1; |
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95 } |
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96 |
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97 static xband *get_xband(genesis_context *gen) |
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98 { |
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99 if (!gen->extra) { |
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100 gen->extra = gen->m68k->options->gen.memmap[0].buffer; |
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101 gen->m68k->mem_pointers[2] = (uint16_t *)gen->save_storage; |
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102 } |
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103 return gen->extra; |
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104 } |
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105 |
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106 static void update_control(genesis_context *gen, uint8_t value) |
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107 { |
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108 xband *x = gen->extra; |
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109 if ((x->control ^ value) & BIT_ROM_HI) { |
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110 if (value & BIT_ROM_HI) { |
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111 gen->m68k->mem_pointers[0] = (uint16_t *)gen->save_storage; |
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112 gen->m68k->mem_pointers[1] = NULL; |
1229 | 113 gen->m68k->mem_pointers[2] = gen->cart; |
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114 gen->m68k->mem_pointers[3] = x->cart_space - 0x100000; |
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115 } else { |
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116 gen->m68k->mem_pointers[0] = x->cart_space; |
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117 gen->m68k->mem_pointers[1] = x->cart_space; |
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118 gen->m68k->mem_pointers[2] = (uint16_t *)gen->save_storage; |
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119 gen->m68k->mem_pointers[3] = NULL; |
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120 } |
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121 m68k_invalidate_code_range(gen->m68k, 0, 0x3BC000); |
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122 } |
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123 x->control = value; |
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124 } |
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125 |
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126 static void *xband_write_b(uint32_t address, void *context, uint8_t value) |
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127 { |
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128 m68k_context *m68k = context; |
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129 genesis_context *gen = m68k->system; |
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130 xband *x = get_xband(gen); |
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131 if (address == 0x181) { |
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132 x->kill = value; |
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133 printf("Write to \"soft\" kill register %X\n", value); |
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134 } else if (address == 0x183) { |
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135 update_control(gen, value); |
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136 printf("Write to \"soft\" control register %X\n", value); |
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137 } else if ((x->control & BIT_ROM_HI && address < 0x200000) || (address >= 0x200000 && !(x->control & BIT_ROM_HI))) { |
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138 gen->save_storage[(address & 0xFFFF) ^ 1] = value; |
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139 m68k_handle_code_write(address, m68k); |
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140 //TODO: handle code at mirror addresses |
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141 } else { |
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142 printf("Unhandled write to cartridge area %X: %X\n", address, value); |
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143 } |
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144 return context; |
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145 } |
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146 |
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147 static void *xband_write_hi_b(uint32_t address, void *context, uint8_t value) |
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148 { |
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149 return xband_write_b(address | 0x200000, context, value); |
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150 } |
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151 |
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152 static void *xband_write_w(uint32_t address, void *context, uint16_t value) |
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153 { |
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154 m68k_context *m68k = context; |
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155 genesis_context *gen = m68k->system; |
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156 xband *x = get_xband(gen); |
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157 if (address == 0x180 || address == 0x182) { |
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158 return xband_write_b(address | 1, context, value); |
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159 } else if ((x->control & BIT_ROM_HI && address < 0x200000) || (address >= 0x200000 && !(x->control & BIT_ROM_HI))) { |
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160 gen->save_storage[address & 0xFFFE] = value; |
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161 gen->save_storage[(address & 0xFFFE) | 1] = value >> 8; |
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162 m68k_handle_code_write(address, m68k); |
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163 //TODO: handle code at mirror addresses |
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164 return context; |
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165 } |
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166 printf("Unhandled write to %X: %X\n", address, value); |
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167 return context; |
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168 } |
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169 |
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170 static void *xband_write_hi_w(uint32_t address, void *context, uint16_t value) |
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171 { |
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172 return xband_write_w(address | 0x200000, context, value); |
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173 } |
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174 |
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175 static uint16_t xband_read_w(uint32_t address, void *context) |
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176 { |
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177 m68k_context *m68k = context; |
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178 genesis_context *gen = m68k->system; |
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179 xband *x = get_xband(gen); |
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180 //TODO: actually do something intelligent here |
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181 return x->cart_space[address >> 1]; |
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182 } |
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183 |
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184 static uint16_t xband_read_hi_w(uint32_t address, void *context) |
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185 { |
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186 return xband_read_w(address | 0x200000, context); |
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187 } |
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188 |
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189 static uint8_t xband_read_b(uint32_t address, void *context) |
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190 { |
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191 uint16_t val = xband_read_w(address, context); |
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192 return address & 1 ? val : val >> 8; |
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193 } |
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194 |
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195 static uint8_t xband_read_hi_b(uint32_t address, void *context) |
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196 { |
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197 return xband_read_b(address | 0x200000, context); |
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198 } |
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199 |
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200 static void *xband_reg_write_b(uint32_t address, void *context, uint8_t value) |
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201 { |
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202 m68k_context *m68k = context; |
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203 genesis_context *gen = m68k->system; |
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204 if (!(address & 1)) { |
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205 printf("Ignoring write to even address %X: %X\n", address, value); |
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206 return context; |
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207 } |
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208 xband *x = get_xband(gen); |
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209 if (address < 0x3BFE00) { |
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210 uint32_t offset = (address - 0x3BC001) / 2; |
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211 if (offset < XBAND_REGS) { |
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212 switch (offset) |
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213 { |
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214 case MORE_MYSTERY: |
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215 case UNKNOWN_REG: |
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216 printf("Write to mysterious reg: %X: %X\n", address, value); |
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217 value = value & 0x7F; |
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218 break; |
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219 case UNKNOWN_REG3: |
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220 printf("Write to mysterious reg: %X: %X\n", address, value); |
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221 value = value & 0xFE; |
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222 break; |
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223 } |
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224 x->regs[offset] = value; |
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225 printf("Write to register %X(%d): %X\n", address, offset, value); |
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226 } else { |
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227 printf("Unhandled register write %X: %X\n", address, value); |
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228 } |
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229 } else { |
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230 if (address == 0x3BFE01) { |
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231 x->kill = value; |
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232 printf("Write to kill register %X\n", value); |
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233 } else if (address == 0x3BFE03) { |
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234 update_control(gen, value); |
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235 printf("Write to control register %X\n", value); |
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236 } else { |
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237 printf("Unhandled register write %X: %X\n", address, value); |
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238 } |
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239 } |
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240 return context; |
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241 } |
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242 |
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243 static void *xband_reg_write_w(uint32_t address, void *context, uint16_t value) |
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244 { |
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245 return xband_reg_write_b(address | 1, context, value); |
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246 } |
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247 |
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248 static uint8_t xband_reg_read_b(uint32_t address, void *context) |
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249 { |
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250 m68k_context *m68k = context; |
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251 genesis_context *gen = m68k->system; |
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252 if (!(address & 1)) { |
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253 printf("Read from even address %X\n", address); |
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254 return gen->header.get_open_bus_value(&gen->header) >> 8; |
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255 } |
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256 xband *x = get_xband(gen); |
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257 if (address < 0x3BFE00) { |
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258 uint32_t offset = (address - 0x3BC001) / 2; |
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259 if (offset < XBAND_REGS) { |
1229 | 260 printf("Regsister read: %X\n", address); |
1228
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261 return x->regs[offset]; |
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262 } else { |
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263 printf("Unhandled register read from address %X\n", address); |
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264 return 0x5D; |
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265 } |
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266 } else { |
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267 if (address == 0x3BFE01) { |
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268 return x->kill; |
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269 } else if (address == 0x3BFE03) { |
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270 return x->control; |
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271 } else { |
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272 printf("Unhandled register read from address %X\n", address); |
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273 return 0x5D; |
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274 } |
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275 } |
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276 } |
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277 |
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278 static uint16_t xband_reg_read_w(uint32_t address, void *context) |
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279 { |
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280 m68k_context *m68k = context; |
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281 genesis_context *gen = m68k->system; |
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282 uint16_t value = xband_reg_read_b(address | 1, context); |
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283 value |= gen->header.get_open_bus_value(&gen->header) & 0xFF00; |
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284 return value; |
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285 } |
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286 |
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287 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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288 { |
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289 rom_info info; |
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290 if (lock_on && lock_on_size) { |
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291 rom_info lock_on_info = configure_rom(rom_db, lock_on, lock_on_size, NULL, 0, base_map, base_chunks); |
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292 info.name = alloc_concat("XBAND - ", lock_on_info.name); |
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293 info.regions = lock_on_info.regions; |
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294 //TODO: Move this to a shared function in romdbc.h |
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295 free(lock_on_info.name); |
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296 if (lock_on_info.save_type != SAVE_NONE) { |
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297 free(lock_on_info.save_buffer); |
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298 if (lock_on_info.save_type == SAVE_I2C) { |
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299 free(lock_on_info.eeprom_map); |
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300 } |
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301 } |
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302 free(lock_on_info.map); |
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303 free(lock_on_info.port1_override); |
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304 free(lock_on_info.port2_override); |
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305 free(lock_on_info.ext_override); |
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306 free(lock_on_info.mouse_mode); |
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307 } else { |
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308 info.name = strdup("XBAND"); |
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309 info.regions = REGION_J|REGION_U|REGION_E; |
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310 } |
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311 info.save_size = 64*1024; |
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312 info.save_buffer = malloc(info.save_size); |
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313 info.save_mask = info.save_size-1; |
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314 info.save_type = RAM_FLAG_BOTH; |
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315 info.port1_override = info.port2_override = info.ext_override = info.mouse_mode = NULL; |
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316 info.eeprom_map = NULL; |
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317 info.num_eeprom = 0; |
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318 xband *x = calloc(sizeof(xband), 1); |
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319 rom_size = nearest_pow2(rom_size); |
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320 for (int i = 0; (i + rom_size) <= sizeof(x->cart_space) / 2; i += rom_size) |
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321 { |
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322 memcpy(x->cart_space + i/2, rom, rom_size); |
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323 } |
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324 if (lock_on && lock_on_size >= 0x200) { |
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325 memcpy(x->cart_space + 0x80, ((uint16_t *)lock_on) + 0x80, 0x100); |
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326 } |
1229 | 327 //observed power on values |
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328 memset(x->regs, 0, sizeof(x->regs)); |
1229 | 329 x->regs[0x7C] = 0; |
330 x->regs[0x7D] = 0x80; | |
331 x->regs[0xB4] = 0x7F; | |
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332 x->regs[UNKNOWN_REG2] = 8; |
1229 | 333 |
1228
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334 byteswap_rom(0x400000, x->cart_space); |
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335 |
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336 info.map_chunks = base_chunks + 5; |
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337 info.map = calloc(sizeof(memmap_chunk), info.map_chunks); |
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338 info.map[0].mask = 0xFFFFFF; |
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339 info.map[0].aux_mask = 0xFFFFFF; |
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340 info.map[0].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX|MMAP_FUNC_NULL|MMAP_AUX_BUFF; |
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341 info.map[0].start = 0; |
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342 info.map[0].end = 0x10000; |
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343 info.map[0].ptr_index = 0; |
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344 info.map[0].buffer = x->cart_space; |
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345 info.map[0].write_16 = xband_write_w; |
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346 info.map[0].write_8 = xband_write_b; |
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347 info.map[0].read_16 = xband_read_w; |
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348 info.map[0].read_8 = xband_read_b; |
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349 info.map[1].mask = 0xFFFFFF; |
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350 info.map[1].aux_mask = 0xFFFFFF; |
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351 info.map[1].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX|MMAP_FUNC_NULL|MMAP_AUX_BUFF; |
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352 info.map[1].start = 0x10000; |
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353 info.map[1].end = 0x200000; |
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354 info.map[1].ptr_index = 1; |
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355 info.map[1].buffer = x->cart_space; |
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356 info.map[1].write_16 = xband_write_w; |
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357 info.map[1].write_8 = xband_write_b; |
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358 info.map[1].read_16 = xband_read_w; |
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359 info.map[1].read_8 = xband_read_b; |
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WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
360 info.map[2].mask = 0xFFFF; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
361 info.map[2].aux_mask = 0xFFFF; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
362 info.map[2].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX|MMAP_FUNC_NULL; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
363 info.map[2].start = 0x200000; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
364 info.map[2].end = 0x210000; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
365 info.map[2].ptr_index = 2; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
366 info.map[2].buffer = NULL; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
367 info.map[2].write_16 = xband_write_hi_w; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
368 info.map[2].write_8 = xband_write_hi_b; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
369 info.map[2].read_16 = xband_read_hi_w; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
370 info.map[2].read_8 = xband_read_hi_b; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
371 info.map[3].mask = 0xFFFFFF; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
372 info.map[3].aux_mask = 0xFFFFFF; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
373 info.map[3].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX|MMAP_FUNC_NULL; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
374 info.map[3].start = 0x210000; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
375 info.map[3].end = 0x3BC000; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
376 info.map[3].ptr_index = 3; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
377 info.map[3].buffer = NULL; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
378 info.map[3].write_16 = xband_write_w; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
379 info.map[3].write_8 = xband_write_b; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
380 info.map[3].read_16 = xband_read_w; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
381 info.map[3].read_8 = xband_read_b; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
382 info.map[4].mask = 0xFFFFFF; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
383 info.map[4].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX|MMAP_FUNC_NULL; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
384 info.map[4].start = 0x3BC000; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
385 info.map[4].end = 0x3C0000; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
386 info.map[4].ptr_index = 4; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
387 info.map[4].write_16 = xband_reg_write_w; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
388 info.map[4].write_8 = xband_reg_write_b; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
389 info.map[4].read_16 = xband_reg_read_w; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
390 info.map[4].read_8 = xband_reg_read_b; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
391 memcpy(info.map + 5, base_map, base_chunks * sizeof(memmap_chunk)); |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
392 |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
393 return info; |
2e6dcb5c11a2
WIP support for XBAND mapper hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
394 } |