Mercurial > repos > blastem
annotate sms.c @ 1142:5c8b1c33ca10
Invalidate translated code on a cartridge bank change in SMS mode. Fix handling of bank 0
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 02 Jan 2017 23:35:40 -0800 |
parents | 7e199bebde2f |
children | d4d770cfbc62 |
rev | line source |
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1117
928a65750345
Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
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1 #include <string.h> |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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2 #include <stdlib.h> |
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3 #include <stddef.h> |
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4 #include "sms.h" |
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5 #include "blastem.h" |
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6 #include "render.h" |
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7 #include "util.h" |
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Enabled Z80 debugger in PBC mode
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8 #include "debug.h" |
1117
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9 |
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10 static void *memory_io_write(uint32_t location, void *vcontext, uint8_t value) |
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11 { |
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12 z80_context *z80 = vcontext; |
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13 sms_context *sms = z80->system; |
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14 if (location & 1) { |
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15 sms->io.ports[0].control = ~(value << 5 & 0x60); |
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16 sms->io.ports[1].control = ~(value << 3 & 0x60); |
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17 io_data_write(sms->io.ports, value << 1, z80->current_cycle); |
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Michael Pavone <pavone@retrodev.com>
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18 io_data_write(sms->io.ports + 1, value >> 1, z80->current_cycle); |
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19 } else { |
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20 //TODO: memory control write |
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21 } |
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22 return vcontext; |
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23 } |
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24 |
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25 static uint8_t hv_read(uint32_t location, void *vcontext) |
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26 { |
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diff
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27 z80_context *z80 = vcontext; |
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28 sms_context *sms = z80->system; |
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29 vdp_run_context(sms->vdp, z80->current_cycle); |
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30 uint16_t hv = vdp_hv_counter_read(sms->vdp); |
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31 if (location & 1) { |
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32 return hv; |
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33 } else { |
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34 return hv >> 8; |
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Michael Pavone <pavone@retrodev.com>
parents:
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35 } |
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parents:
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36 } |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
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37 |
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38 static void *sms_psg_write(uint32_t location, void *vcontext, uint8_t value) |
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Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
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39 { |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
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40 z80_context *z80 = vcontext; |
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parents:
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41 sms_context *sms = z80->system; |
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parents:
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42 psg_run(sms->psg, z80->current_cycle); |
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43 psg_write(sms->psg, value); |
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parents:
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44 return vcontext; |
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45 } |
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parents:
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46 |
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47 static void update_interrupts(sms_context *sms) |
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48 { |
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49 uint32_t vint = vdp_next_vint(sms->vdp); |
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50 uint32_t hint = vdp_next_hint(sms->vdp); |
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51 sms->z80->int_pulse_start = vint < hint ? vint : hint; |
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52 } |
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53 |
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54 static uint8_t vdp_read(uint32_t location, void *vcontext) |
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parents:
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55 { |
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56 z80_context *z80 = vcontext; |
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parents:
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57 sms_context *sms = z80->system; |
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58 vdp_run_context(sms->vdp, z80->current_cycle); |
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59 if (location & 1) { |
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60 uint8_t ret = vdp_control_port_read(sms->vdp); |
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Fix clearing of interrupt pending flags on control port read in PBC mode
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61 sms->vdp->flags2 &= ~(FLAG2_VINT_PENDING|FLAG2_HINT_PENDING); |
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62 update_interrupts(sms); |
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63 return ret; |
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64 } else { |
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65 return vdp_data_port_read(sms->vdp); |
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66 } |
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67 } |
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68 |
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69 static void *vdp_write(uint32_t location, void *vcontext, uint8_t value) |
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70 { |
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71 z80_context *z80 = vcontext; |
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72 sms_context *sms = z80->system; |
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73 vdp_run_context(sms->vdp, z80->current_cycle); |
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parents:
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74 if (location & 1) { |
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75 vdp_control_port_write_pbc(sms->vdp, value); |
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76 update_interrupts(sms); |
928a65750345
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parents:
diff
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77 } else { |
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78 vdp_data_port_write_pbc(sms->vdp, value); |
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79 } |
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80 return vcontext; |
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parents:
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81 } |
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82 |
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83 static uint8_t io_read(uint32_t location, void *vcontext) |
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84 { |
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85 z80_context *z80 = vcontext; |
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86 sms_context *sms = z80->system; |
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87 if (location == 0xC0 || location == 0xDC) { |
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88 uint8_t port_a = io_data_read(sms->io.ports, z80->current_cycle); |
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89 uint8_t port_b = io_data_read(sms->io.ports, z80->current_cycle); |
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90 return (port_a & 0x3F) | (port_b << 6); |
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91 } |
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92 if (location == 0xC1 || location == 0xDD) { |
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93 uint8_t port_a = io_data_read(sms->io.ports, z80->current_cycle); |
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parents:
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94 uint8_t port_b = io_data_read(sms->io.ports, z80->current_cycle); |
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95 return (port_a & 0x40) | (port_b >> 2 & 0xF) | (port_b << 1 & 0x80) | 0x10; |
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96 } |
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97 return 0xFF; |
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98 } |
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99 |
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Initial support for Sega's family of SMS mappers
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100 static void *mapper_write(uint32_t location, void *vcontext, uint8_t value) |
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101 { |
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102 z80_context *z80 = vcontext; |
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103 sms_context *sms = z80->system; |
1142
5c8b1c33ca10
Invalidate translated code on a cartridge bank change in SMS mode. Fix handling of bank 0
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parents:
1141
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104 void *old_value; |
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105 sms->ram[location & (sizeof(sms->ram)-1)] = value; |
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106 location &= 3; |
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107 if (location) { |
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108 uint32_t idx = location - 1; |
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109 old_value = z80->mem_pointers[idx]; |
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110 z80->mem_pointers[idx] = sms->rom + (value << 14 & (sms->rom_size-1)); |
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111 if (old_value != z80->mem_pointers[idx]) { |
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112 //invalidate any code we translated for the relevant bank |
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113 z80_invalidate_code_range(z80, idx ? idx * 0x4000 : 0x400, idx * 0x4000 + 0x4000); |
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114 } |
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115 } else { |
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116 //TODO: implement me |
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117 } |
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118 return vcontext; |
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119 } |
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120 |
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121 static memmap_chunk io_map[] = { |
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122 {0x00, 0x40, 0xFF, 0, 0, 0, NULL, NULL, NULL, NULL, memory_io_write}, |
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123 {0x40, 0x80, 0xFF, 0, 0, 0, NULL, NULL, NULL, hv_read, sms_psg_write}, |
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124 {0x80, 0xC0, 0xFF, 0, 0, 0, NULL, NULL, NULL, vdp_read, vdp_write}, |
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125 {0xC0, 0x100,0xFF, 0, 0, 0, NULL, NULL, NULL, io_read, NULL} |
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126 }; |
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127 |
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128 static void set_speed_percent(system_header * system, uint32_t percent) |
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129 { |
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130 sms_context *context = (sms_context *)system; |
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131 uint32_t old_clock = context->master_clock; |
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132 context->master_clock = ((uint64_t)context->normal_clock * (uint64_t)percent) / 100; |
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133 |
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134 psg_adjust_master_clock(context->psg, context->master_clock); |
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135 } |
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136 |
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137 static void run_sms(system_header *system) |
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138 { |
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139 render_disable_ym(); |
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140 sms_context *sms = (sms_context *)system; |
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141 uint32_t target_cycle = sms->z80->current_cycle + 3420*262; |
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142 while (!sms->should_return) |
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143 { |
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144 if (system->enter_debugger && sms->z80->pc) { |
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145 system->enter_debugger = 0; |
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146 zdebugger(sms->z80, sms->z80->pc); |
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147 } |
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148 z80_run(sms->z80, target_cycle); |
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149 target_cycle = sms->z80->current_cycle; |
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150 vdp_run_context(sms->vdp, target_cycle); |
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151 psg_run(sms->psg, target_cycle); |
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152 target_cycle += 3420*262; |
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153 if (target_cycle > 0x10000000) { |
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154 uint32_t adjust = sms->z80->current_cycle - 3420*262*2; |
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155 io_adjust_cycles(sms->io.ports, sms->z80->current_cycle, adjust); |
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156 io_adjust_cycles(sms->io.ports+1, sms->z80->current_cycle, adjust); |
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157 z80_adjust_cycles(sms->z80, adjust); |
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158 vdp_adjust_cycles(sms->vdp, adjust); |
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159 sms->psg->cycles -= adjust; |
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160 target_cycle -= adjust; |
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161 } |
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162 } |
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163 sms->should_return = 0; |
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164 render_enable_ym(); |
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165 } |
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166 |
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167 static void start_sms(system_header *system, char *statefile) |
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168 { |
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169 sms_context *sms = (sms_context *)system; |
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170 set_keybindings(&sms->io); |
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171 |
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172 if (system->enter_debugger) { |
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173 system->enter_debugger = 0; |
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174 zinsert_breakpoint(sms->z80, 0, (uint8_t *)zdebugger); |
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175 } |
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176 |
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177 z80_assert_reset(sms->z80, 0); |
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178 z80_clear_reset(sms->z80, 128*15); |
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179 |
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180 run_sms(system); |
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181 } |
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182 |
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183 static void free_sms(system_header *system) |
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184 { |
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185 sms_context *sms = (sms_context *)system; |
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186 vdp_free(sms->vdp); |
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187 z80_options_free(sms->z80->options); |
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188 free(sms->z80); |
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189 psg_free(sms->psg); |
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190 free(sms); |
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191 } |
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192 |
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193 static uint16_t get_open_bus_value(system_header *system) |
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194 { |
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195 return 0xFFFF; |
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196 } |
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197 |
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198 static void request_exit(system_header *system) |
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199 { |
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200 sms_context *sms = (sms_context *)system; |
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201 sms->should_return = 1; |
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202 } |
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203 |
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204 static void inc_debug_mode(system_header *system) |
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205 { |
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206 sms_context *sms = (sms_context *)system; |
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207 sms->vdp->debug++; |
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208 if (sms->vdp->debug == 7) { |
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209 sms->vdp->debug = 0; |
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210 } |
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211 } |
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212 |
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213 static void inc_debug_pal(system_header *system) |
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214 { |
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215 sms_context *sms = (sms_context *)system; |
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216 sms->vdp->debug_pal++; |
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217 if (sms->vdp->debug_pal == 4) { |
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218 sms->vdp->debug_pal = 0; |
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219 } |
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220 } |
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221 |
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222 sms_context *alloc_configure_sms(void *rom, uint32_t rom_size, void *extra_rom, uint32_t extra_rom_size, uint32_t opts, uint8_t force_region, rom_info *info_out) |
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223 { |
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224 memset(info_out, 0, sizeof(*info_out)); |
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225 sms_context *sms = calloc(1, sizeof(sms_context)); |
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226 uint32_t orig_size = rom_size; |
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227 rom_size = nearest_pow2(rom_size); |
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228 memmap_chunk memory_map[6]; |
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229 if (orig_size > 0xC000) { |
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230 info_out->map_chunks = 6; |
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231 uint8_t *ram_reg_overlap = sms->ram + sizeof(sms->ram) - 4; |
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232 memory_map[0] = (memmap_chunk){0x0000, 0x0400, 0xFFFF, 0, 0, MMAP_READ, rom, NULL, NULL, NULL, NULL}; |
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233 memory_map[1] = (memmap_chunk){0x0400, 0x4000, 0xFFFF, 0, 0, MMAP_READ|MMAP_PTR_IDX|MMAP_CODE, NULL, NULL, NULL, NULL, NULL}; |
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234 memory_map[2] = (memmap_chunk){0x4000, 0x8000, 0x3FFF, 0, 1, MMAP_READ|MMAP_PTR_IDX|MMAP_CODE, NULL, NULL, NULL, NULL, NULL}; |
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235 memory_map[3] = (memmap_chunk){0x8000, 0xC000, 0x3FFF, 0, 2, MMAP_READ|MMAP_PTR_IDX|MMAP_CODE, NULL, NULL, NULL, NULL, NULL}; |
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236 memory_map[4] = (memmap_chunk){0xC000, 0xFFFC, sizeof(sms->ram)-1, 0, 0, MMAP_READ|MMAP_WRITE|MMAP_CODE, sms->ram, NULL, NULL, NULL, NULL}; |
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237 memory_map[5] = (memmap_chunk){0xFFFC, 0x10000, 0xFFFF, 0, 0, MMAP_READ, ram_reg_overlap, NULL, NULL, NULL, mapper_write}; |
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238 } else { |
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239 info_out->map_chunks = 2; |
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240 memory_map[0] = (memmap_chunk){0x0000, 0xC000, rom_size-1, 0, 0, MMAP_READ, rom, NULL, NULL, NULL, NULL}; |
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241 memory_map[1] = (memmap_chunk){0xC000, 0x10000, sizeof(sms->ram)-1, 0, 0, MMAP_READ|MMAP_WRITE|MMAP_CODE, sms->ram, NULL, NULL, NULL, NULL}; |
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242 }; |
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243 info_out->map = malloc(sizeof(memmap_chunk) * info_out->map_chunks); |
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244 memcpy(info_out->map, memory_map, sizeof(memmap_chunk) * info_out->map_chunks); |
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245 z80_options *zopts = malloc(sizeof(z80_options)); |
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246 init_z80_opts(zopts, info_out->map, info_out->map_chunks, io_map, 4, 15, 0xFF); |
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247 sms->z80 = init_z80_context(zopts); |
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248 sms->z80->system = sms; |
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249 |
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250 sms->rom = rom; |
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251 sms->rom_size = rom_size; |
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252 if (info_out->map_chunks > 2) { |
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253 sms->z80->mem_pointers[0] = sms->rom; |
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254 sms->z80->mem_pointers[1] = sms->rom + 0x4000; |
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255 sms->z80->mem_pointers[2] = sms->rom + 0x8000; |
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256 } |
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257 |
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258 char * lowpass_cutoff_str = tern_find_path(config, "audio\0lowpass_cutoff\0").ptrval; |
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259 uint32_t lowpass_cutoff = lowpass_cutoff_str ? atoi(lowpass_cutoff_str) : 3390; |
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260 |
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261 //TODO: Detect region and pick master clock based off of that |
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262 sms->normal_clock = sms->master_clock = 53693175; |
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263 |
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264 sms->psg = malloc(sizeof(psg_context)); |
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265 psg_init(sms->psg, render_sample_rate(), sms->master_clock, 15*16, render_audio_buffer(), lowpass_cutoff); |
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266 |
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267 sms->vdp = malloc(sizeof(vdp_context)); |
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268 init_vdp_context(sms->vdp, 0); |
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269 sms->vdp->system = &sms->header; |
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270 |
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271 info_out->save_type = SAVE_NONE; |
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272 info_out->name = strdup("Master System Game"); |
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273 |
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274 setup_io_devices(config, info_out, &sms->io); |
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275 |
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276 sms->header.set_speed_percent = set_speed_percent; |
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277 sms->header.start_context = start_sms; |
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278 sms->header.resume_context = run_sms; |
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279 //TODO: Fill in NULL values |
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280 sms->header.load_save = NULL; |
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281 sms->header.persist_save = NULL; |
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282 sms->header.free_context = free_sms; |
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283 sms->header.get_open_bus_value = get_open_bus_value; |
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284 sms->header.request_exit = request_exit; |
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285 sms->header.inc_debug_mode = inc_debug_mode; |
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286 sms->header.inc_debug_pal = inc_debug_pal; |
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287 |
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288 return sms; |
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289 } |