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annotate sms.c @ 1143:d4d770cfbc62

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Fix handling of IO control writes in SMS mode
author Michael Pavone <pavone@retrodev.com>
date Tue, 03 Jan 2017 20:42:15 -0800
parents 5c8b1c33ca10
children 80ef49539550
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1117
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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1 #include <string.h>
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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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8 #include "debug.h"
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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;
1117
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17 io_data_write(sms->io.ports, value << 1, z80->current_cycle);
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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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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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35 }
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36 }
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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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39 {
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40 z80_context *z80 = vcontext;
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41 sms_context *sms = z80->system;
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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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44 return vcontext;
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45 }
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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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55 {
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56 z80_context *z80 = vcontext;
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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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55ea7f9a4e92 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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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);
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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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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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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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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;
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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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Michael Pavone <pavone@retrodev.com>
parents: 1130
diff changeset
116 //TODO: implement me
7e199bebde2f Initial support for Sega's family of SMS mappers
Michael Pavone <pavone@retrodev.com>
parents: 1130
diff changeset
117 }
7e199bebde2f Initial support for Sega's family of SMS mappers
Michael Pavone <pavone@retrodev.com>
parents: 1130
diff changeset
118 return vcontext;
7e199bebde2f Initial support for Sega's family of SMS mappers
Michael Pavone <pavone@retrodev.com>
parents: 1130
diff changeset
119 }
7e199bebde2f Initial support for Sega's family of SMS mappers
Michael Pavone <pavone@retrodev.com>
parents: 1130
diff changeset
120
1117
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
121 static memmap_chunk io_map[] = {
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
122 {0x00, 0x40, 0xFF, 0, 0, 0, NULL, NULL, NULL, NULL, memory_io_write},
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
123 {0x40, 0x80, 0xFF, 0, 0, 0, NULL, NULL, NULL, hv_read, sms_psg_write},
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
124 {0x80, 0xC0, 0xFF, 0, 0, 0, NULL, NULL, NULL, vdp_read, vdp_write},
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
125 {0xC0, 0x100,0xFF, 0, 0, 0, NULL, NULL, NULL, io_read, NULL}
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
126 };
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
127
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
128 static void set_speed_percent(system_header * system, uint32_t percent)
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
129 {
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
130 sms_context *context = (sms_context *)system;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
131 uint32_t old_clock = context->master_clock;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
132 context->master_clock = ((uint64_t)context->normal_clock * (uint64_t)percent) / 100;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
133
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
134 psg_adjust_master_clock(context->psg, context->master_clock);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
135 }
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
136
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
137 static void run_sms(system_header *system)
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
138 {
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
139 render_disable_ym();
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
140 sms_context *sms = (sms_context *)system;
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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141 uint32_t target_cycle = sms->z80->current_cycle + 3420*262;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
142 while (!sms->should_return)
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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143 {
1129
6b5c92b6205c Enabled Z80 debugger in PBC mode
Michael Pavone <pavone@retrodev.com>
parents: 1126
diff changeset
144 if (system->enter_debugger && sms->z80->pc) {
6b5c92b6205c Enabled Z80 debugger in PBC mode
Michael Pavone <pavone@retrodev.com>
parents: 1126
diff changeset
145 system->enter_debugger = 0;
6b5c92b6205c Enabled Z80 debugger in PBC mode
Michael Pavone <pavone@retrodev.com>
parents: 1126
diff changeset
146 zdebugger(sms->z80, sms->z80->pc);
6b5c92b6205c Enabled Z80 debugger in PBC mode
Michael Pavone <pavone@retrodev.com>
parents: 1126
diff changeset
147 }
1117
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
148 z80_run(sms->z80, target_cycle);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
149 target_cycle = sms->z80->current_cycle;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
150 vdp_run_context(sms->vdp, target_cycle);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
151 psg_run(sms->psg, target_cycle);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
152 target_cycle += 3420*262;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
153 if (target_cycle > 0x10000000) {
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
154 uint32_t adjust = sms->z80->current_cycle - 3420*262*2;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
155 io_adjust_cycles(sms->io.ports, sms->z80->current_cycle, adjust);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
156 io_adjust_cycles(sms->io.ports+1, sms->z80->current_cycle, adjust);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
157 z80_adjust_cycles(sms->z80, adjust);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
158 vdp_adjust_cycles(sms->vdp, adjust);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
159 sms->psg->cycles -= adjust;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
160 target_cycle -= adjust;
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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161 }
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
162 }
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
163 sms->should_return = 0;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
164 render_enable_ym();
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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165 }
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
166
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
167 static void start_sms(system_header *system, char *statefile)
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
168 {
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
169 sms_context *sms = (sms_context *)system;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
170 set_keybindings(&sms->io);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
171
1129
6b5c92b6205c Enabled Z80 debugger in PBC mode
Michael Pavone <pavone@retrodev.com>
parents: 1126
diff changeset
172 if (system->enter_debugger) {
6b5c92b6205c Enabled Z80 debugger in PBC mode
Michael Pavone <pavone@retrodev.com>
parents: 1126
diff changeset
173 system->enter_debugger = 0;
6b5c92b6205c Enabled Z80 debugger in PBC mode
Michael Pavone <pavone@retrodev.com>
parents: 1126
diff changeset
174 zinsert_breakpoint(sms->z80, 0, (uint8_t *)zdebugger);
6b5c92b6205c Enabled Z80 debugger in PBC mode
Michael Pavone <pavone@retrodev.com>
parents: 1126
diff changeset
175 }
6b5c92b6205c Enabled Z80 debugger in PBC mode
Michael Pavone <pavone@retrodev.com>
parents: 1126
diff changeset
176
1117
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
177 z80_assert_reset(sms->z80, 0);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
178 z80_clear_reset(sms->z80, 128*15);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
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parents:
diff changeset
179
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
180 run_sms(system);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
181 }
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
182
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
183 static void free_sms(system_header *system)
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
184 {
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
185 sms_context *sms = (sms_context *)system;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
186 vdp_free(sms->vdp);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
187 z80_options_free(sms->z80->options);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
188 free(sms->z80);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
189 psg_free(sms->psg);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
190 free(sms);
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
191 }
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
192
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
193 static uint16_t get_open_bus_value(system_header *system)
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
194 {
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
195 return 0xFFFF;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
196 }
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
197
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
198 static void request_exit(system_header *system)
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
199 {
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
200 sms_context *sms = (sms_context *)system;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
201 sms->should_return = 1;
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
202 }
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
203
1120
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
204 static void inc_debug_mode(system_header *system)
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
205 {
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
206 sms_context *sms = (sms_context *)system;
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
207 sms->vdp->debug++;
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
208 if (sms->vdp->debug == 7) {
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
209 sms->vdp->debug = 0;
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
210 }
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
211 }
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
212
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
213 static void inc_debug_pal(system_header *system)
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
214 {
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
215 sms_context *sms = (sms_context *)system;
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
216 sms->vdp->debug_pal++;
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
217 if (sms->vdp->debug_pal == 4) {
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
218 sms->vdp->debug_pal = 0;
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
219 }
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
220 }
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
221
1117
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
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)
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
223 {
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
224 memset(info_out, 0, sizeof(*info_out));
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
225 sms_context *sms = calloc(1, sizeof(sms_context));
1141
7e199bebde2f Initial support for Sega's family of SMS mappers
Michael Pavone <pavone@retrodev.com>
parents: 1130
diff changeset
226 uint32_t orig_size = rom_size;
1117
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
227 rom_size = nearest_pow2(rom_size);
1141
7e199bebde2f Initial support for Sega's family of SMS mappers
Michael Pavone <pavone@retrodev.com>
parents: 1130
diff changeset
228 memmap_chunk memory_map[6];
7e199bebde2f Initial support for Sega's family of SMS mappers
Michael Pavone <pavone@retrodev.com>
parents: 1130
diff changeset
229 if (orig_size > 0xC000) {
7e199bebde2f Initial support for Sega's family of SMS mappers
Michael Pavone <pavone@retrodev.com>
parents: 1130
diff changeset
230 info_out->map_chunks = 6;
7e199bebde2f Initial support for Sega's family of SMS mappers
Michael Pavone <pavone@retrodev.com>
parents: 1130
diff changeset
231 uint8_t *ram_reg_overlap = sms->ram + sizeof(sms->ram) - 4;
1142
5c8b1c33ca10 Invalidate translated code on a cartridge bank change in SMS mode. Fix handling of bank 0
Michael Pavone <pavone@retrodev.com>
parents: 1141
diff changeset
232 memory_map[0] = (memmap_chunk){0x0000, 0x0400, 0xFFFF, 0, 0, MMAP_READ, rom, NULL, NULL, NULL, NULL};
5c8b1c33ca10 Invalidate translated code on a cartridge bank change in SMS mode. Fix handling of bank 0
Michael Pavone <pavone@retrodev.com>
parents: 1141
diff changeset
233 memory_map[1] = (memmap_chunk){0x0400, 0x4000, 0xFFFF, 0, 0, MMAP_READ|MMAP_PTR_IDX|MMAP_CODE, NULL, NULL, NULL, NULL, NULL};
5c8b1c33ca10 Invalidate translated code on a cartridge bank change in SMS mode. Fix handling of bank 0
Michael Pavone <pavone@retrodev.com>
parents: 1141
diff changeset
234 memory_map[2] = (memmap_chunk){0x4000, 0x8000, 0x3FFF, 0, 1, MMAP_READ|MMAP_PTR_IDX|MMAP_CODE, NULL, NULL, NULL, NULL, NULL};
5c8b1c33ca10 Invalidate translated code on a cartridge bank change in SMS mode. Fix handling of bank 0
Michael Pavone <pavone@retrodev.com>
parents: 1141
diff changeset
235 memory_map[3] = (memmap_chunk){0x8000, 0xC000, 0x3FFF, 0, 2, MMAP_READ|MMAP_PTR_IDX|MMAP_CODE, NULL, NULL, NULL, NULL, NULL};
5c8b1c33ca10 Invalidate translated code on a cartridge bank change in SMS mode. Fix handling of bank 0
Michael Pavone <pavone@retrodev.com>
parents: 1141
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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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parents: 1141
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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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parents: 1130
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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};
1117
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parents:
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242 };
1141
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parents: 1130
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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);
1117
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parents:
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245 z80_options *zopts = malloc(sizeof(z80_options));
1141
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parents: 1130
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246 init_z80_opts(zopts, info_out->map, info_out->map_chunks, io_map, 4, 15, 0xFF);
1130
8f14767661fa Remove memory map assumptions from Z80 core and move a little bit of logic to the generic backend.c so it can be shared between CPU cores
Michael Pavone <pavone@retrodev.com>
parents: 1129
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247 sms->z80 = init_z80_context(zopts);
1117
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parents:
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248 sms->z80->system = sms;
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249
1141
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parents: 1130
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250 sms->rom = rom;
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251 sms->rom_size = rom_size;
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parents: 1130
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252 if (info_out->map_chunks > 2) {
7e199bebde2f Initial support for Sega's family of SMS mappers
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parents: 1130
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253 sms->z80->mem_pointers[0] = sms->rom;
7e199bebde2f Initial support for Sega's family of SMS mappers
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parents: 1130
diff changeset
254 sms->z80->mem_pointers[1] = sms->rom + 0x4000;
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parents: 1130
diff changeset
255 sms->z80->mem_pointers[2] = sms->rom + 0x8000;
7e199bebde2f Initial support for Sega's family of SMS mappers
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parents: 1130
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256 }
7e199bebde2f Initial support for Sega's family of SMS mappers
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parents: 1130
diff changeset
257
1117
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parents:
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258 char * lowpass_cutoff_str = tern_find_path(config, "audio\0lowpass_cutoff\0").ptrval;
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parents:
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259 uint32_t lowpass_cutoff = lowpass_cutoff_str ? atoi(lowpass_cutoff_str) : 3390;
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parents:
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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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parents:
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262 sms->normal_clock = sms->master_clock = 53693175;
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parents:
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263
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parents:
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264 sms->psg = malloc(sizeof(psg_context));
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parents:
diff changeset
265 psg_init(sms->psg, render_sample_rate(), sms->master_clock, 15*16, render_audio_buffer(), lowpass_cutoff);
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parents:
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266
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parents:
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267 sms->vdp = malloc(sizeof(vdp_context));
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parents:
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268 init_vdp_context(sms->vdp, 0);
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parents:
diff changeset
269 sms->vdp->system = &sms->header;
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parents:
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270
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parents:
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271 info_out->save_type = SAVE_NONE;
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parents:
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272 info_out->name = strdup("Master System Game");
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parents:
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273
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parents:
diff changeset
274 setup_io_devices(config, info_out, &sms->io);
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parents:
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275
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parents:
diff changeset
276 sms->header.set_speed_percent = set_speed_percent;
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parents:
diff changeset
277 sms->header.start_context = start_sms;
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parents:
diff changeset
278 sms->header.resume_context = run_sms;
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parents:
diff changeset
279 //TODO: Fill in NULL values
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parents:
diff changeset
280 sms->header.load_save = NULL;
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parents:
diff changeset
281 sms->header.persist_save = NULL;
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parents:
diff changeset
282 sms->header.free_context = free_sms;
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parents:
diff changeset
283 sms->header.get_open_bus_value = get_open_bus_value;
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parents:
diff changeset
284 sms->header.request_exit = request_exit;
1120
e9369d6f0101 Somewhat broken implementation of Mode 4
Michael Pavone <pavone@retrodev.com>
parents: 1119
diff changeset
285 sms->header.inc_debug_mode = inc_debug_mode;
e9369d6f0101 Somewhat broken implementation of Mode 4
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parents: 1119
diff changeset
286 sms->header.inc_debug_pal = inc_debug_pal;
1117
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parents:
diff changeset
287
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parents:
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288 return sms;
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parents:
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289 }