Mercurial > repos > blastem
annotate realtec.c @ 2013:dcdad92f84a4
Multiplying by zero and shifting by zero are very different. Fixes regression in Overdrive 2
author | Michael Pavone <pavone@retrodev.com> |
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date | Sun, 01 Nov 2020 13:28:31 -0800 |
parents | adb62000d296 |
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rev | line source |
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1 #include <stdint.h> |
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2 #include <stdlib.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 "util.h" |
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7 |
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8 typedef struct { |
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9 uint8_t rom_space[512*1024]; |
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10 uint8_t regs[3]; |
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11 } realtec; |
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12 |
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13 |
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14 uint8_t realtec_detect(uint8_t *rom, uint32_t rom_size) |
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15 { |
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16 //All Realtec mapper games are 512KB total |
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17 if (rom_size != 512*1024) { |
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18 return 0; |
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19 } |
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20 return memcmp(rom + 0x7E100, "SEGA", 4) == 0; |
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21 } |
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22 |
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23 static realtec *get_realtec(genesis_context *gen) |
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24 { |
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25 if (!gen->extra) { |
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26 gen->extra = gen->m68k->mem_pointers[0]; |
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27 } |
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28 return gen->extra; |
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29 } |
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30 |
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31 static void *realtec_write_b(uint32_t address, void *context, uint8_t value) |
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32 { |
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33 if (address & 1) { |
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34 return context; |
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35 } |
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36 m68k_context *m68k = context; |
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37 genesis_context *gen = m68k->system; |
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38 realtec *r = get_realtec(gen); |
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39 uint32_t offset = address >> 13; |
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40 if (offset < 3 && r->regs[offset] != value) { |
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41 r->regs[offset] = value; |
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42 //other regs are only 3 bits, so assume 3 for this one too |
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43 uint32_t size = (r->regs[1] & 0x7) << 17; |
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44 uint32_t start = (r->regs[2] & 7) << 17 | (r->regs[0] & 6) << 19; |
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45 if (!size || size > 512*1024) { |
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46 size = 512*1024; |
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47 } |
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48 for(uint32_t cur = 0; cur < 512*1024; cur += size) |
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49 { |
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50 if (start + size > 512*1024) { |
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51 memcpy(r->rom_space + cur, gen->cart + start/2, 512*1024-start); |
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52 //assume it wraps |
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53 memcpy(r->rom_space + cur + 512*1024-start, gen->cart, size - (512*1024-start)); |
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54 } else { |
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55 memcpy(r->rom_space + cur, gen->cart + start/2, size); |
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56 } |
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57 } |
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58 m68k_invalidate_code_range(gen->m68k, 0, 0x400000); |
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59 } |
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60 return context; |
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61 } |
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62 |
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63 static void *realtec_write_w(uint32_t address, void *context, uint16_t value) |
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64 { |
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65 return realtec_write_b(address, context, value >> 8); |
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66 } |
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67 |
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68 void realtec_serialize(genesis_context *gen, serialize_buffer *buf) |
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69 { |
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70 realtec *r = get_realtec(gen); |
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71 save_buffer8(buf, r->regs, sizeof(r->regs)); |
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72 } |
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73 |
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74 void realtec_deserialize(deserialize_buffer *buf, genesis_context *gen) |
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75 { |
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76 realtec *r = get_realtec(gen); |
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77 for (int i = 0; i < sizeof(r->regs); i++) |
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78 { |
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79 realtec_write_b(i << 13, gen->m68k, load_int8(buf)); |
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80 } |
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81 } |
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82 |
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83 rom_info realtec_configure_rom(uint8_t *rom, uint32_t rom_size, memmap_chunk const *base_map, uint32_t base_chunks) |
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84 { |
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85 rom_info info; |
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86 realtec *r = calloc(sizeof(realtec), 1); |
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87 for (uint32_t i = 0; i < 512*1024; i += 8*1024) |
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88 { |
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89 memcpy(r->rom_space + i, rom + 0x7E000, 8*1024); |
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90 } |
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91 byteswap_rom(512*1024, (uint16_t *)r->rom_space); |
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92 |
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93 uint8_t *name_start = NULL, *name_end = NULL; |
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94 for (int i = 0x94; i < 0xE0; i++) |
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95 { |
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96 if (name_start) { |
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97 if (rom[i] < ' ' || rom[i] > 0x80 || !memcmp(rom+i, "ARE", 3) || !memcmp(rom+i, "are", 3)) { |
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98 name_end = rom+i; |
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99 break; |
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100 } |
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101 } else if (rom[i] > ' ' && rom[i] < 0x80 && rom[i] != ':') { |
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102 name_start = rom + i; |
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103 } |
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104 } |
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105 if (name_start && !name_end) { |
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106 name_end = rom + 0xE0; |
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107 } |
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108 if (name_end) { |
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109 while (name_end > name_start && name_end[-1] == ' ') |
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110 { |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
111 name_end--; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
112 } |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
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113 info.name = malloc(name_end-name_start+1); |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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114 memcpy(info.name, name_start, name_end-name_start); |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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115 info.name[name_end-name_start] = 0; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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116 } else { |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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117 info.name = strdup("Realtec Game"); |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
118 } |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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119 info.save_type = SAVE_NONE; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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120 info.save_size = 0; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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121 info.save_buffer = NULL; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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122 info.num_eeprom = 0; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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123 info.eeprom_map = NULL; |
1416
11ac0b511cff
Support a couple of bootleg X-in-1 carts
Michael Pavone <pavone@retrodev.com>
parents:
1261
diff
changeset
|
124 info.rom = rom; |
11ac0b511cff
Support a couple of bootleg X-in-1 carts
Michael Pavone <pavone@retrodev.com>
parents:
1261
diff
changeset
|
125 info.rom_size = rom_size; |
1444
14a2834d010c
Save/restore mapper state in native save states
Michael Pavone <pavone@retrodev.com>
parents:
1416
diff
changeset
|
126 info.mapper_type = MAPPER_REALTEC; |
1416
11ac0b511cff
Support a couple of bootleg X-in-1 carts
Michael Pavone <pavone@retrodev.com>
parents:
1261
diff
changeset
|
127 info.is_save_lock_on = 0; |
1259
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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128 info.port1_override = info.port2_override = info.ext_override = info.mouse_mode = NULL; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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129 info.map_chunks = base_chunks + 2; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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130 info.map = calloc(sizeof(memmap_chunk), info.map_chunks); |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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131 info.map[0].mask = sizeof(r->rom_space)-1; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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132 info.map[0].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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133 info.map[0].start = 0; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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134 info.map[0].end = 0x400000; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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135 info.map[0].buffer = r->rom_space; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
136 info.map[0].write_16 = NULL; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
137 info.map[0].read_16 = NULL; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
138 info.map[0].write_8 = NULL; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
139 info.map[0].read_8 = NULL; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
140 info.map[1].mask = 0x7FFF; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
141 info.map[1].flags = 0; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
142 info.map[1].start = 0x400000; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
143 info.map[1].end = 0x800000; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
144 info.map[1].write_16 = realtec_write_w; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
145 info.map[1].write_8 = realtec_write_b; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
146 info.map[1].read_16 = NULL; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
147 info.map[1].read_8 = NULL; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
148 memcpy(info.map + 2, base_map, base_chunks * sizeof(memmap_chunk)); |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
149 |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
150 return info; |
23c94f5266d1
Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
151 } |