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annotate z80_util.c @ 1863:d60f2d7c02a5

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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
author Michael Pavone <pavone@retrodev.com>
date Tue, 14 May 2019 23:20:35 -0700
parents 72540af9c90a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include <string.h>
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2
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3 void z80_read_8(z80_context *context)
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4 {
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5 context->cycles += 3 * context->opts->gen.clock_divider;
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6 uint8_t *fast = context->fastread[context->scratch1 >> 10];
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7 if (fast) {
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8 context->scratch1 = fast[context->scratch1 & 0x3FF];
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9 } else {
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10 context->scratch1 = read_byte(context->scratch1, (void **)context->mem_pointers, &context->opts->gen, context);
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11 }
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12 }
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13
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14 void z80_write_8(z80_context *context)
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15 {
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16 context->cycles += 3 * context->opts->gen.clock_divider;
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17 uint8_t *fast = context->fastwrite[context->scratch2 >> 10];
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18 if (fast) {
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19 fast[context->scratch2 & 0x3FF] = context->scratch1;
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20 } else {
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21 write_byte(context->scratch2, context->scratch1, (void **)context->mem_pointers, &context->opts->gen, context);
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22 }
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23 }
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24
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25 void z80_io_read8(z80_context *context)
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26 {
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27 uint32_t tmp_mask = context->opts->gen.address_mask;
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28 memmap_chunk const *tmp_map = context->opts->gen.memmap;
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29 uint32_t tmp_chunks = context->opts->gen.memmap_chunks;
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30
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31 context->opts->gen.address_mask = context->io_mask;
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32 context->opts->gen.memmap = context->io_map;
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33 context->opts->gen.memmap_chunks = context->io_chunks;
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34
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35 context->cycles += 4 * context->opts->gen.clock_divider;
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36 context->scratch1 = read_byte(context->scratch1, (void **)context->mem_pointers, &context->opts->gen, context);
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37
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38 context->opts->gen.address_mask = tmp_mask;
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39 context->opts->gen.memmap = tmp_map;
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40 context->opts->gen.memmap_chunks = tmp_chunks;
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41 }
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42
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43 void z80_io_write8(z80_context *context)
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44 {
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45 uint32_t tmp_mask = context->opts->gen.address_mask;
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46 memmap_chunk const *tmp_map = context->opts->gen.memmap;
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47 uint32_t tmp_chunks = context->opts->gen.memmap_chunks;
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48
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49 context->opts->gen.address_mask = context->io_mask;
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50 context->opts->gen.memmap = context->io_map;
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51 context->opts->gen.memmap_chunks = context->io_chunks;
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52
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53 context->cycles += 4 * context->opts->gen.clock_divider;
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54 write_byte(context->scratch2, context->scratch1, (void **)context->mem_pointers, &context->opts->gen, context);
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55
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56 context->opts->gen.address_mask = tmp_mask;
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57 context->opts->gen.memmap = tmp_map;
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58 context->opts->gen.memmap_chunks = tmp_chunks;
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59 }
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61 //quick hack until I get a chance to change which init method these get passed to
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62 static memmap_chunk const * tmp_io_chunks;
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63 static uint32_t tmp_num_io_chunks, tmp_io_mask;
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64 void init_z80_opts(z80_options * options, memmap_chunk const * chunks, uint32_t num_chunks, memmap_chunk const * io_chunks, uint32_t num_io_chunks, uint32_t clock_divider, uint32_t io_address_mask)
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65 {
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66 memset(options, 0, sizeof(*options));
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67 options->gen.memmap = chunks;
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68 options->gen.memmap_chunks = num_chunks;
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69 options->gen.address_mask = 0xFFFF;
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70 options->gen.max_address = 0xFFFF;
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71 options->gen.clock_divider = clock_divider;
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72 tmp_io_chunks = io_chunks;
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73 tmp_num_io_chunks = num_io_chunks;
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74 tmp_io_mask = io_address_mask;
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75 }
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76
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77 void z80_options_free(z80_options *opts)
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78 {
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79 free(opts);
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80 }
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81
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82 z80_context * init_z80_context(z80_options *options)
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83 {
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84 z80_context *context = calloc(1, sizeof(z80_context));
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85 context->opts = options;
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86 context->io_map = (memmap_chunk *)tmp_io_chunks;
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87 context->io_chunks = tmp_num_io_chunks;
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88 context->io_mask = tmp_io_mask;
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89 context->int_cycle = context->int_end_cycle = context->nmi_cycle = 0xFFFFFFFFU;
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90 z80_invalidate_code_range(context, 0, 0xFFFF);
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91 return context;
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92 }
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93
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94 void z80_sync_cycle(z80_context *context, uint32_t target_cycle)
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95 {
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96 if (context->iff1 && context->int_cycle < target_cycle) {
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97 if (context->cycles > context->int_end_cycle) {
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98 context->int_cycle = 0xFFFFFFFFU;
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99 } else {
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100 target_cycle = context->int_cycle;
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101 }
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102 };
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103 if (context->nmi_cycle < target_cycle) {
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104 target_cycle = context->nmi_cycle;
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105 }
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106 context->sync_cycle = target_cycle;
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107 }
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108
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109 void z80_run(z80_context *context, uint32_t target_cycle)
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110 {
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111 if (context->reset || context->busack) {
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112 context->cycles = target_cycle;
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113 } else if (target_cycle > context->cycles) {
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114 if (context->busreq) {
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115 //busreq is sampled at the end of an m-cycle
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116 //we can approximate that by running for a single m-cycle after a bus request
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117 target_cycle = context->cycles + 4 * context->opts->gen.clock_divider;
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118 }
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119 z80_execute(context, target_cycle);
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120 if (context->busreq) {
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121 context->busack = 1;
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122 }
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123 }
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124 }
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diff changeset
125
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126 void z80_assert_reset(z80_context * context, uint32_t cycle)
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127 {
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128 z80_run(context, cycle);
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129 context->reset = 1;
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130 }
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131
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132 void z80_clear_reset(z80_context * context, uint32_t cycle)
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133 {
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134 z80_run(context, cycle);
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135 if (context->reset) {
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136 context->imode = 0;
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137 context->iff1 = context->iff2 = 0;
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138 context->pc = 0;
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139 context->reset = 0;
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140 if (context->busreq) {
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141 //TODO: Figure out appropriate delay
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142 context->busack = 1;
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143 }
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144 }
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145 }
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146
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147 #define MAX_MCYCLE_LENGTH 6
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148 void z80_assert_busreq(z80_context * context, uint32_t cycle)
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149 {
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150 z80_run(context, cycle);
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151 context->busreq = 1;
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152 //this is an imperfect aproximation since most M-cycles take less tstates than the max
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153 //and a short 3-tstate m-cycle can take an unbounded number due to wait states
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154 if (context->cycles - cycle > MAX_MCYCLE_LENGTH * context->opts->gen.clock_divider) {
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155 context->busack = 1;
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156 }
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157 }
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158
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159 void z80_clear_busreq(z80_context * context, uint32_t cycle)
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160 {
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161 z80_run(context, cycle);
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162 context->busreq = 0;
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163 context->busack = 0;
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164 //there appears to be at least a 1 Z80 cycle delay between busreq
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165 //being released and resumption of execution
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166 context->cycles += context->opts->gen.clock_divider;
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167 }
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168
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169 void z80_assert_nmi(z80_context *context, uint32_t cycle)
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170 {
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171 context->nmi_cycle = cycle;
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172 }
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173
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174 uint8_t z80_get_busack(z80_context * context, uint32_t cycle)
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175 {
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176 z80_run(context, cycle);
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177 return context->busack;
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178 }
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179
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180 void z80_invalidate_code_range(z80_context *context, uint32_t startA, uint32_t endA)
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181 {
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182 for(startA &= ~0x3FF; startA < endA; startA += 1024)
1752
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183 {
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184 uint8_t *start = get_native_pointer(startA, (void**)context->mem_pointers, &context->opts->gen);
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185 if (start) {
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186 uint8_t *end = get_native_pointer(startA + 1023, (void**)context->mem_pointers, &context->opts->gen);
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187 if (!end || end - start != 1023) {
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188 start = NULL;
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189 }
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190 }
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diff changeset
191 context->fastread[startA >> 10] = start;
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diff changeset
192 start = get_native_write_pointer(startA, (void**)context->mem_pointers, &context->opts->gen);
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diff changeset
193 if (start) {
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diff changeset
194 uint8_t *end = get_native_write_pointer(startA + 1023, (void**)context->mem_pointers, &context->opts->gen);
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diff changeset
195 if (!end || end - start != 1023) {
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196 start = NULL;
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197 }
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198 }
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diff changeset
199 context->fastwrite[startA >> 10] = start;
1752
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200 }
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201 }
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202
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203 void z80_adjust_cycles(z80_context * context, uint32_t deduction)
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204 {
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205 context->cycles -= deduction;
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diff changeset
206 if (context->int_cycle != 0xFFFFFFFFU) {
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diff changeset
207 if (context->int_cycle > deduction) {
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diff changeset
208 context->int_cycle -= deduction;
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diff changeset
209 } else {
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diff changeset
210 context->int_cycle = 0;
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diff changeset
211 }
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diff changeset
212 }
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diff changeset
213 if (context->int_end_cycle != 0xFFFFFFFFU) {
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diff changeset
214 if (context->int_end_cycle > deduction) {
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diff changeset
215 context->int_end_cycle -= deduction;
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diff changeset
216 } else {
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diff changeset
217 context->int_end_cycle = 0;
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diff changeset
218 }
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diff changeset
219 }
1752
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diff changeset
220 if (context->nmi_cycle != 0xFFFFFFFFU) {
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diff changeset
221 if (context->nmi_cycle > deduction) {
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diff changeset
222 context->nmi_cycle -= deduction;
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diff changeset
223 } else {
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diff changeset
224 context->nmi_cycle = 0;
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diff changeset
225 }
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diff changeset
226 }
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diff changeset
227 }
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diff changeset
228
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diff changeset
229 void z80_serialize(z80_context *context, serialize_buffer *buf)
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diff changeset
230 {
1784
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diff changeset
231 save_int8(buf, context->main[1]);//C
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diff changeset
232 save_int8(buf, context->main[0]);//B
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diff changeset
233 save_int8(buf, context->main[3]);//E
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diff changeset
234 save_int8(buf, context->main[2]);//D
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diff changeset
235 save_int8(buf, context->main[5]);//L
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diff changeset
236 save_int8(buf, context->main[4]);//H
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diff changeset
237 save_int8(buf, context->ix);//IXL
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parents: 1759
diff changeset
238 save_int8(buf, context->ix >> 8);//IXH
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diff changeset
239 save_int8(buf, context->iy);//IYL
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diff changeset
240 save_int8(buf, context->iy >> 8);//IYH
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diff changeset
241 save_int8(buf, context->i);
72540af9c90a Implement serialization/deserialization in new Z80 core
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parents: 1759
diff changeset
242 save_int8(buf, (context->rhigh & 0x80) | (context->r & 0x7F));
72540af9c90a Implement serialization/deserialization in new Z80 core
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diff changeset
243 save_int8(buf, context->main[7]);//A
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244 uint8_t f = context->last_flag_result & 0xA8
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245 | (context->zflag ? 0x40 : 0)
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246 | (context->chflags & 8 ? 0x10 : 0)
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247 | (context->pvflag ? 4 : 0)
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248 | (context->nflag ? 2 : 0)
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249 | (context->chflags & 0x80 ? 1 : 0);
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250 save_int8(buf, f);
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251 save_int8(buf, context->alt[1]);//C
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252 save_int8(buf, context->alt[0]);//B
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253 save_int8(buf, context->alt[3]);//E
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254 save_int8(buf, context->alt[2]);//D
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255 save_int8(buf, context->alt[5]);//L
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256 save_int8(buf, context->alt[4]);//H
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257 save_int8(buf, 0);//non-existant alt ixl
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258 save_int8(buf, 0);//non-existant alt ixh
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259 save_int8(buf, 0);//non-existant alt iyl
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260 save_int8(buf, 0);//non-existant alt iyh
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261 save_int8(buf, 0);//non-existant alt i
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262 save_int8(buf, 0);//non-existant alt r
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263 save_int8(buf, context->alt[7]);//A
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264 save_int8(buf, context->alt[6]);//F
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265
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266 save_int16(buf, context->pc);
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267 save_int16(buf, context->sp);
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268 save_int8(buf, context->imode);
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269 save_int8(buf, context->iff1);
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270 save_int8(buf, context->iff2);
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271 uint8_t is_nmi = context->nmi_cycle != 0xFFFFFFFF && (context->nmi_cycle < context->int_cycle || !context->iff1);
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272 save_int8(buf, is_nmi);//int_is_nmi
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273 save_int8(buf, context->busack);
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274 save_int32(buf, context->cycles);
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275 save_int32(buf, is_nmi ? context->nmi_cycle : context->int_cycle);//int_cycle
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276 save_int32(buf, 0);//int_enable_cycle
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277 save_int32(buf, context->int_cycle);
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278 save_int32(buf, context->int_end_cycle);
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279 save_int32(buf, context->nmi_cycle);
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280 }
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281
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282 void z80_deserialize(deserialize_buffer *buf, void *vcontext)
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283 {
1784
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284 z80_context *context = vcontext;
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285 context->main[1] = load_int8(buf);//C
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286 context->main[0] = load_int8(buf);//B
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287 context->main[3] = load_int8(buf);//E
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288 context->main[2] = load_int8(buf);//D
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289 context->main[5] = load_int8(buf);//L
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290 context->main[4] = load_int8(buf);//H
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291 context->ix = load_int8(buf);//IXL
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292 context->ix |= load_int8(buf) << 8;//IXH
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293 context->iy = load_int8(buf);//IYL
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294 context->iy |= load_int8(buf) << 8;//IYH
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295 context->i = load_int8(buf);
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296 context->r = load_int8(buf);
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297 context->rhigh = context->r & 0x80;
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298 context->main[7] = load_int8(buf);//A
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299 context->last_flag_result = load_int8(buf);
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300 context->zflag = context->last_flag_result & 0x40;
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301 context->chflags = context->last_flag_result & 0x10 ? 8 : 0;
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302 context->pvflag = context->last_flag_result & 4;
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303 context->nflag = context->last_flag_result & 2;
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304 context->chflags |= context->last_flag_result & 1 ? 0x80 : 0;
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305 context->alt[1] = load_int8(buf);//C
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306 context->alt[0] = load_int8(buf);//B
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307 context->alt[3] = load_int8(buf);//E
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308 context->alt[2] = load_int8(buf);//D
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309 context->alt[5] = load_int8(buf);//L
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310 context->alt[4] = load_int8(buf);//H
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311 load_int8(buf);//non-existant alt ixl
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312 load_int8(buf);//non-existant alt ixh
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313 load_int8(buf);//non-existant alt iyl
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314 load_int8(buf);//non-existant alt iyh
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315 load_int8(buf);//non-existant alt i
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316 load_int8(buf);//non-existant alt r
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317 context->alt[7] = load_int8(buf);//A
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318 context->alt[6] = load_int8(buf);//F
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319
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320 context->pc = load_int16(buf);
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321 context->sp = load_int16(buf);
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322 context->imode = load_int8(buf);
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diff changeset
323 context->iff1 = load_int8(buf);
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324 context->iff2 = load_int8(buf);
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325 load_int8(buf);//int_is_nmi
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326 context->busack = load_int8(buf);
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327 context->cycles = load_int32(buf);
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328 load_int32(buf);//int_cycle
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329 load_int32(buf);//int_enable_cycle
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diff changeset
330 context->int_cycle = load_int32(buf);
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331 context->int_end_cycle = load_int32(buf);
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332 context->nmi_cycle = load_int32(buf);
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333 }
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334
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335 void zinsert_breakpoint(z80_context * context, uint16_t address, uint8_t * bp_handler)
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336 {
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337 }
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diff changeset
338
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339 void zremove_breakpoint(z80_context * context, uint16_t address)
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340 {
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341 }