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annotate realtec.c @ 2148:2da377ea932f

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Initial stab at CDC DMA cycle stealing and sub CPU refresh delays
author Michael Pavone <pavone@retrodev.com>
date Sat, 26 Mar 2022 20:14:41 -0700
parents adb62000d296
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
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diff changeset
1 #include <stdint.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include "romdb.h"
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5 #include "genesis.h"
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6 #include "util.h"
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7
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8 typedef struct {
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9 uint8_t rom_space[512*1024];
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10 uint8_t regs[3];
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11 } realtec;
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12
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13
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14 uint8_t realtec_detect(uint8_t *rom, uint32_t rom_size)
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15 {
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16 //All Realtec mapper games are 512KB total
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17 if (rom_size != 512*1024) {
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18 return 0;
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19 }
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20 return memcmp(rom + 0x7E100, "SEGA", 4) == 0;
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21 }
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22
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23 static realtec *get_realtec(genesis_context *gen)
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24 {
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25 if (!gen->extra) {
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26 gen->extra = gen->m68k->mem_pointers[0];
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27 }
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28 return gen->extra;
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29 }
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30
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31 static void *realtec_write_b(uint32_t address, void *context, uint8_t value)
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32 {
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33 if (address & 1) {
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34 return context;
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35 }
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36 m68k_context *m68k = context;
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37 genesis_context *gen = m68k->system;
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38 realtec *r = get_realtec(gen);
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39 uint32_t offset = address >> 13;
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40 if (offset < 3 && r->regs[offset] != value) {
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41 r->regs[offset] = value;
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42 //other regs are only 3 bits, so assume 3 for this one too
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43 uint32_t size = (r->regs[1] & 0x7) << 17;
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44 uint32_t start = (r->regs[2] & 7) << 17 | (r->regs[0] & 6) << 19;
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45 if (!size || size > 512*1024) {
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46 size = 512*1024;
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47 }
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48 for(uint32_t cur = 0; cur < 512*1024; cur += size)
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49 {
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50 if (start + size > 512*1024) {
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51 memcpy(r->rom_space + cur, gen->cart + start/2, 512*1024-start);
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52 //assume it wraps
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53 memcpy(r->rom_space + cur + 512*1024-start, gen->cart, size - (512*1024-start));
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54 } else {
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55 memcpy(r->rom_space + cur, gen->cart + start/2, size);
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56 }
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57 }
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58 m68k_invalidate_code_range(gen->m68k, 0, 0x400000);
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59 }
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60 return context;
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61 }
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62
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63 static void *realtec_write_w(uint32_t address, void *context, uint16_t value)
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64 {
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65 return realtec_write_b(address, context, value >> 8);
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66 }
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67
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68 void realtec_serialize(genesis_context *gen, serialize_buffer *buf)
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69 {
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70 realtec *r = get_realtec(gen);
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71 save_buffer8(buf, r->regs, sizeof(r->regs));
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72 }
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73
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74 void realtec_deserialize(deserialize_buffer *buf, genesis_context *gen)
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75 {
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76 realtec *r = get_realtec(gen);
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77 for (int i = 0; i < sizeof(r->regs); i++)
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78 {
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79 realtec_write_b(i << 13, gen->m68k, load_int8(buf));
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80 }
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81 }
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82
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83 rom_info realtec_configure_rom(uint8_t *rom, uint32_t rom_size, memmap_chunk const *base_map, uint32_t base_chunks)
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84 {
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85 rom_info info;
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86 realtec *r = calloc(sizeof(realtec), 1);
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87 for (uint32_t i = 0; i < 512*1024; i += 8*1024)
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88 {
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89 memcpy(r->rom_space + i, rom + 0x7E000, 8*1024);
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90 }
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91 byteswap_rom(512*1024, (uint16_t *)r->rom_space);
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92
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93 uint8_t *name_start = NULL, *name_end = NULL;
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94 for (int i = 0x94; i < 0xE0; i++)
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95 {
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96 if (name_start) {
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97 if (rom[i] < ' ' || rom[i] > 0x80 || !memcmp(rom+i, "ARE", 3) || !memcmp(rom+i, "are", 3)) {
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98 name_end = rom+i;
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99 break;
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100 }
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101 } else if (rom[i] > ' ' && rom[i] < 0x80 && rom[i] != ':') {
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102 name_start = rom + i;
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103 }
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104 }
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105 if (name_start && !name_end) {
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106 name_end = rom + 0xE0;
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107 }
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108 if (name_end) {
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109 while (name_end > name_start && name_end[-1] == ' ')
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110 {
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111 name_end--;
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112 }
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113 info.name = malloc(name_end-name_start+1);
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114 memcpy(info.name, name_start, name_end-name_start);
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115 info.name[name_end-name_start] = 0;
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116 } else {
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117 info.name = strdup("Realtec Game");
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118 }
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119 info.save_type = SAVE_NONE;
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120 info.save_size = 0;
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121 info.save_buffer = NULL;
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122 info.num_eeprom = 0;
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123 info.eeprom_map = NULL;
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124 info.rom = rom;
11ac0b511cff Support a couple of bootleg X-in-1 carts
Michael Pavone <pavone@retrodev.com>
parents: 1261
diff changeset
125 info.rom_size = rom_size;
1444
14a2834d010c Save/restore mapper state in native save states
Michael Pavone <pavone@retrodev.com>
parents: 1416
diff changeset
126 info.mapper_type = MAPPER_REALTEC;
1416
11ac0b511cff Support a couple of bootleg X-in-1 carts
Michael Pavone <pavone@retrodev.com>
parents: 1261
diff changeset
127 info.is_save_lock_on = 0;
1259
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
128 info.port1_override = info.port2_override = info.ext_override = info.mouse_mode = NULL;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
129 info.map_chunks = base_chunks + 2;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
130 info.map = calloc(sizeof(memmap_chunk), info.map_chunks);
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
131 info.map[0].mask = sizeof(r->rom_space)-1;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
132 info.map[0].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
133 info.map[0].start = 0;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
134 info.map[0].end = 0x400000;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
135 info.map[0].buffer = r->rom_space;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
136 info.map[0].write_16 = NULL;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
137 info.map[0].read_16 = NULL;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
138 info.map[0].write_8 = NULL;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
139 info.map[0].read_8 = NULL;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
140 info.map[1].mask = 0x7FFF;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
141 info.map[1].flags = 0;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
142 info.map[1].start = 0x400000;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
143 info.map[1].end = 0x800000;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
144 info.map[1].write_16 = realtec_write_w;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
145 info.map[1].write_8 = realtec_write_b;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
146 info.map[1].read_16 = NULL;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
147 info.map[1].read_8 = NULL;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
148 memcpy(info.map + 2, base_map, base_chunks * sizeof(memmap_chunk));
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
149
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
150 return info;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
151 }