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annotate realtec.c @ 1971:80920c21bb52

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Add an event log soft flush and call it twice per frame in between hard flushes to netplay latency when there are insufficient hardware updates to flush packets in the middle of a frame
author Michael Pavone <pavone@retrodev.com>
date Fri, 08 May 2020 11:40:30 -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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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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diff changeset
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 }