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annotate realtec.c @ 1272:be509813b2f2

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Fill in the rest of the framebuffer holes created by horizontal border. Work remains for things to be seemless when display gets turned on and off mid frame
author Michael Pavone <pavone@retrodev.com>
date Tue, 07 Mar 2017 20:17:12 -0800
parents f13f51e9f9f2
children 11ac0b511cff
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1259
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
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diff changeset
1 #include <stdint.h>
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
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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 void *realtec_write_b(uint32_t address, void *context, uint8_t value)
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24 {
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25 if (address & 1) {
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26 return context;
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27 }
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28 m68k_context *m68k = context;
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29 genesis_context *gen = m68k->system;
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30 if (!gen->extra) {
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31 gen->extra = m68k->mem_pointers[0];
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32 }
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33 realtec *r = gen->extra;
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34 uint32_t offset = address >> 13;
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35 uint8_t dirty = 0;
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36 if (offset < 3 && r->regs[offset] != value) {
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37 r->regs[offset] = value;
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38 //other regs are only 3 bits, so assume 3 for this one too
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39 uint32_t size = (r->regs[1] & 0x7) << 17;
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40 uint32_t start = (r->regs[2] & 7) << 17 | (r->regs[0] & 6) << 19;
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41 if (size > 512*1024) {
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42 size = 512*1024;
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43 }
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44 for(uint32_t cur = 0; cur < 512*1024; cur += size)
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45 {
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46 if (start + size > 512*1024) {
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47 memcpy(r->rom_space + cur, gen->cart + start/2, 512*1024-start);
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48 //assume it wraps
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49 memcpy(r->rom_space + cur + 512*1024-start, gen->cart, size - (512*1024-start));
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50 } else {
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51 memcpy(r->rom_space + cur, gen->cart + start/2, size);
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52 }
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53 }
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54 m68k_invalidate_code_range(gen->m68k, 0, 0x400000);
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55 }
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56 return context;
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57 }
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58
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59 static void *realtec_write_w(uint32_t address, void *context, uint16_t value)
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60 {
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61 return realtec_write_b(address, context, value >> 8);
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62 }
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63
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64 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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65 {
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66 rom_info info;
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67 realtec *r = calloc(sizeof(realtec), 1);
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68 for (uint32_t i = 0; i < 512*1024; i += 8*1024)
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69 {
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70 memcpy(r->rom_space + i, rom + 0x7E000, 8*1024);
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71 }
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72 byteswap_rom(512*1024, (uint16_t *)r->rom_space);
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73
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74 uint8_t *name_start = NULL, *name_end = NULL;
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75 for (int i = 0x94; i < 0xE0; i++)
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76 {
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77 if (name_start) {
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78 if (rom[i] < ' ' || rom[i] > 0x80 || !memcmp(rom+i, "ARE", 3) || !memcmp(rom+i, "are", 3)) {
1259
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79 name_end = rom+i;
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80 break;
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81 }
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82 } else if (rom[i] > ' ' && rom[i] < 0x80 && rom[i] != ':') {
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83 name_start = rom + i;
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84 }
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85 }
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86 if (name_start && !name_end) {
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87 name_end = rom + 0xE0;
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88 }
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89 if (name_end) {
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90 while (name_end > name_start && name_end[-1] == ' ')
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91 {
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92 name_end--;
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93 }
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94 info.name = malloc(name_end-name_start+1);
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95 memcpy(info.name, name_start, name_end-name_start);
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96 info.name[name_end-name_start] = 0;
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97 } else {
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98 info.name = strdup("Realtec Game");
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99 }
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100 info.save_type = SAVE_NONE;
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101 info.save_size = 0;
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102 info.save_buffer = NULL;
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103 info.num_eeprom = 0;
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104 info.eeprom_map = NULL;
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105 info.port1_override = info.port2_override = info.ext_override = info.mouse_mode = NULL;
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106 info.map_chunks = base_chunks + 2;
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107 info.map = calloc(sizeof(memmap_chunk), info.map_chunks);
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108 info.map[0].mask = sizeof(r->rom_space)-1;
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109 info.map[0].flags = MMAP_READ|MMAP_CODE|MMAP_PTR_IDX;
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110 info.map[0].start = 0;
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111 info.map[0].end = 0x400000;
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112 info.map[0].buffer = r->rom_space;
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113 info.map[0].write_16 = NULL;
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114 info.map[0].read_16 = NULL;
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115 info.map[0].write_8 = NULL;
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116 info.map[0].read_8 = NULL;
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117 info.map[1].mask = 0x7FFF;
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118 info.map[1].flags = 0;
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119 info.map[1].start = 0x400000;
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diff changeset
120 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
121 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
122 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
123 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
124 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
125 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
126
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
127 return info;
23c94f5266d1 Support for the Realtec mapper. Needs testing with games besides The Earth Defend
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
128 }