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annotate sega_mapper.c @ 2009:4ace0fef6f8f

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Add support for the parts of the KMod debug ports used by SGDK
author Mike Pavone <pavone@retrodev.com>
date Mon, 19 Oct 2020 15:46:16 -0700
parents d60f2d7c02a5
children 374a5ae694e8 3748a2a8a4b7
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1 #include "genesis.h"
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2
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3 uint16_t read_sram_w(uint32_t address, m68k_context * context)
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4 {
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5 genesis_context * gen = context->system;
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6 address &= gen->save_ram_mask;
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7 switch(gen->save_type)
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8 {
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9 case RAM_FLAG_BOTH:
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10 return gen->save_storage[address] << 8 | gen->save_storage[address+1];
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11 case RAM_FLAG_EVEN:
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12 return gen->save_storage[address >> 1] << 8 | 0xFF;
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13 case RAM_FLAG_ODD:
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14 return gen->save_storage[address >> 1] | 0xFF00;
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15 }
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16 return 0xFFFF;//We should never get here
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17 }
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18
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19 uint8_t read_sram_b(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];
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27 case RAM_FLAG_EVEN:
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28 if (address & 1) {
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29 return 0xFF;
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30 } else {
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31 return gen->save_storage[address >> 1];
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32 }
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33 case RAM_FLAG_ODD:
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34 if (address & 1) {
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35 return gen->save_storage[address >> 1];
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36 } else {
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37 return 0xFF;
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38 }
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39 }
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40 return 0xFF;//We should never get here
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41 }
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42
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43 m68k_context * write_sram_area_w(uint32_t address, m68k_context * context, uint16_t value)
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44 {
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45 genesis_context * gen = context->system;
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46 if ((gen->bank_regs[0] & 0x3) == 1) {
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47 address &= gen->save_ram_mask;
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48 switch(gen->save_type)
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49 {
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50 case RAM_FLAG_BOTH:
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51 gen->save_storage[address] = value >> 8;
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52 gen->save_storage[address+1] = value;
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53 break;
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54 case RAM_FLAG_EVEN:
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55 gen->save_storage[address >> 1] = value >> 8;
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56 break;
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57 case RAM_FLAG_ODD:
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58 gen->save_storage[address >> 1] = value;
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59 break;
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60 }
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61 }
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62 return context;
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63 }
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64
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65 m68k_context * write_sram_area_b(uint32_t address, m68k_context * context, uint8_t value)
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66 {
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67 genesis_context * gen = context->system;
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68 if ((gen->bank_regs[0] & 0x3) == 1) {
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69 address &= gen->save_ram_mask;
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70 switch(gen->save_type)
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71 {
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72 case RAM_FLAG_BOTH:
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73 gen->save_storage[address] = value;
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74 break;
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75 case RAM_FLAG_EVEN:
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76 if (!(address & 1)) {
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77 gen->save_storage[address >> 1] = value;
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78 }
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79 break;
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80 case RAM_FLAG_ODD:
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81 if (address & 1) {
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82 gen->save_storage[address >> 1] = value;
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83 }
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84 break;
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85 }
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86 }
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87 return context;
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88 }
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89
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90 m68k_context * write_bank_reg_w(uint32_t address, m68k_context * context, uint16_t value)
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91 {
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92 genesis_context * gen = context->system;
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93 address &= 0xE;
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94 address >>= 1;
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95 gen->bank_regs[address] = value;
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96 if (!address) {
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97 if (value & 1) {
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98 //Used for games that only use the mapper for SRAM
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99 if (context->mem_pointers[gen->mapper_start_index]) {
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100 gen->mapper_temp = context->mem_pointers[gen->mapper_start_index];
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101 }
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102 context->mem_pointers[gen->mapper_start_index] = NULL;
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103 //For games that need more than 4MB
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104 for (int i = 4; i < 8; i++)
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105 {
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106 context->mem_pointers[gen->mapper_start_index + i] = NULL;
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107 }
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108 } else {
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109 //Used for games that only use the mapper for SRAM
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110 if (!context->mem_pointers[gen->mapper_start_index]) {
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111 context->mem_pointers[gen->mapper_start_index] = gen->mapper_temp;
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112 }
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113 //For games that need more than 4MB
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114 for (int i = 4; i < 8; i++)
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115 {
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116 context->mem_pointers[gen->mapper_start_index + i] = gen->cart + 0x40000*gen->bank_regs[i];
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117 }
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118 }
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d60f2d7c02a5 Differentiate between the full Sega mapper and the SRAM only one. Fixes crash on save state load for Phantasy Star IV and other games that use the same mapper
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119 } else if (gen->mapper_type == MAPPER_SEGA) {
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120 void *new_ptr = gen->cart + 0x40000*value;
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121 if (context->mem_pointers[gen->mapper_start_index + address] != new_ptr) {
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122 m68k_invalidate_code_range(gen->m68k, address * 0x80000, (address + 1) * 0x80000);
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123 context->mem_pointers[gen->mapper_start_index + address] = new_ptr;
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124 }
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125 }
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126 return context;
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127 }
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128
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129 m68k_context * write_bank_reg_b(uint32_t address, m68k_context * context, uint8_t value)
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130 {
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131 if (address & 1) {
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132 write_bank_reg_w(address, context, value);
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133 }
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134 return context;
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135 }
1444
14a2834d010c Save/restore mapper state in native save states
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136
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137 void sega_mapper_serialize(genesis_context *gen, serialize_buffer *buf)
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138 {
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139 save_buffer8(buf, gen->bank_regs, sizeof(gen->bank_regs));
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140 }
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141
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142 void sega_mapper_deserialize(deserialize_buffer *buf, genesis_context *gen)
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143 {
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144 for (int i = 0; i < sizeof(gen->bank_regs); i++)
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145 {
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parents: 1415
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146 write_bank_reg_w(i * 2, gen->m68k, load_int8(buf));
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147 }
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parents: 1415
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148 }