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annotate z80_util.c @ 1755:28635b733d97

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Add appropriate cycles for IO access
author Michael Pavone <pavone@retrodev.com>
date Fri, 15 Feb 2019 23:58:55 -0800
parents 33ec5df77fac
children 6e4faa10f9ee
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48a43dff4dc0 Added init functions to z80_util.c so new Z80 core is closer to a drop in replacement for the old one
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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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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 uint32_t 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 return 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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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)
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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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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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193 if (start) {
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194 uint8_t *end = get_native_write_pointer(startA + 1023, (void**)context->mem_pointers, &context->opts->gen);
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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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199 context->fastwrite[startA >> 10] = start;
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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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207 if (context->int_cycle > deduction) {
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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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211 }
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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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221 if (context->nmi_cycle > deduction) {
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diff changeset
222 context->nmi_cycle -= deduction;
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223 } else {
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224 context->nmi_cycle = 0;
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225 }
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226 }
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227 }
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diff changeset
228
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229 void z80_serialize(z80_context *context, serialize_buffer *buf)
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230 {
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diff changeset
231 //TODO: Implement me
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232 }
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diff changeset
233
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diff changeset
234 void z80_deserialize(deserialize_buffer *buf, void *vcontext)
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235 {
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236 //TODO: Implement me
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diff changeset
237 }
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diff changeset
238
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diff changeset
239 void zinsert_breakpoint(z80_context * context, uint16_t address, uint8_t * bp_handler)
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240 {
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diff changeset
241 }
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diff changeset
242
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diff changeset
243 void zremove_breakpoint(z80_context * context, uint16_t address)
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diff changeset
244 {
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parents: 1750
diff changeset
245 }