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comparison segacd.c @ 2123:50385ae2617b

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Attempt to select an appropriate Sega/Mega CD BIOS file based on region and config
author Michael Pavone <pavone@retrodev.com>
date Thu, 10 Mar 2022 22:33:08 -0800
parents bb478feccca2
children 8a67b043ba25
comparison
equal deleted inserted replaced
2122:bb478feccca2 2123:50385ae2617b
3 #include "cd_graphics.h" 3 #include "cd_graphics.h"
4 #include "genesis.h" 4 #include "genesis.h"
5 #include "util.h" 5 #include "util.h"
6 #include "debug.h" 6 #include "debug.h"
7 #include "gdb_remote.h" 7 #include "gdb_remote.h"
8 #include "blastem.h"
8 9
9 #define SCD_MCLKS 50000000 10 #define SCD_MCLKS 50000000
10 #define SCD_PERIPH_RESET_CLKS (SCD_MCLKS / 10) 11 #define SCD_PERIPH_RESET_CLKS (SCD_MCLKS / 10)
11 #define TIMER_TICK_CLKS 1536 12 #define TIMER_TICK_CLKS 1536
12 13
1266 {0xFF8000, 0xFF8200, 0x0001FF, .read_16 = sub_gate_read16, .write_16 = sub_gate_write16, .read_8 = sub_gate_read8, .write_8 = sub_gate_write8} 1267 {0xFF8000, 0xFF8200, 0x0001FF, .read_16 = sub_gate_read16, .write_16 = sub_gate_write16, .read_8 = sub_gate_read8, .write_8 = sub_gate_write8}
1267 }; 1268 };
1268 1269
1269 segacd_context *cd = calloc(sizeof(segacd_context), 1); 1270 segacd_context *cd = calloc(sizeof(segacd_context), 1);
1270 uint32_t firmware_size; 1271 uint32_t firmware_size;
1271 cd->rom = (uint16_t *)read_bundled_file("cdbios.bin", &firmware_size); 1272 uint8_t region = force_region;
1273 if (!region) {
1274 char * def_region = tern_find_path_default(config, "system\0default_region\0", (tern_val){.ptrval = "U"}, TVAL_PTR).ptrval;
1275 if (!info->regions || (info->regions & translate_region_char(toupper(*def_region)))) {
1276 region = translate_region_char(toupper(*def_region));
1277 } else {
1278 region = info->regions;
1279 }
1280 }
1281 const char *key;
1282 if (region & REGION_E) {
1283 key = "system\0scd_bios_eu\0";
1284 } else if (region & REGION_J) {
1285 key = "system\0scd_bios_jp\0";
1286 } else {
1287 key = "system\0scd_bios_us\0";
1288 }
1289 char *bios_path = tern_find_path_default(config, key, (tern_val){.ptrval = "cdbios.bin"}, TVAL_PTR).ptrval;
1290 cd->rom = (uint16_t *)read_bundled_file(bios_path, &firmware_size);
1291 if (!cd->rom) {
1292 fatal_error("Failed to load Sega CD BIOS from %s\n", bios_path);
1293 }
1272 uint32_t adjusted_size = nearest_pow2(firmware_size); 1294 uint32_t adjusted_size = nearest_pow2(firmware_size);
1273 if (adjusted_size != firmware_size) { 1295 if (adjusted_size != firmware_size) {
1274 cd->rom = realloc(cd->rom, adjusted_size); 1296 cd->rom = realloc(cd->rom, adjusted_size);
1275 } 1297 }
1276 cd->rom_mut = malloc(adjusted_size); 1298 cd->rom_mut = malloc(adjusted_size);