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https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
starting SMS work
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@756 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz
parent
d8f51995c4
commit
3e49ffd0bf
10 changed files with 246 additions and 80 deletions
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@ -174,8 +174,7 @@ static int emu_isBios(const char *name)
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static unsigned char id_header[0x100];
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/* checks if fname points to valid MegaCD image
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* if so, checks for suitable BIOS */
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/* checks if fname points to valid MegaCD image */
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static int emu_cd_check(int *pregion, const char *fname_in)
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{
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const char *fname = fname_in;
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@ -243,6 +242,58 @@ static int emu_cd_check(int *pregion, const char *fname_in)
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return type;
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}
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static int detect_media(const char *fname)
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{
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static const short sms_offsets[] = { 0x7ff0, 0x3ff0, 0x1ff0 };
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pm_file *pmf;
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char buff[32];
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char ext[5];
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int i;
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get_ext(fname, ext);
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// detect wrong extensions
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if (!strcmp(ext, ".srm") || !strcmp(ext, "s.gz") || !strcmp(ext, ".mds")) // s.gz ~ .mds.gz
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return PM_BAD;
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/* don't believe in extensions, except .cue */
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if (strcasecmp(ext, ".cue") == 0)
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return PM_CD;
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pmf = pm_open(fname);
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if (pmf == NULL)
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return PM_BAD;
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if (pm_read(buff, 32, pmf) != 32) {
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pm_close(pmf);
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return PM_BAD;
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}
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if (strncasecmp("SEGADISCSYSTEM", buff + 0x00, 14) == 0 ||
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strncasecmp("SEGADISCSYSTEM", buff + 0x10, 14) == 0) {
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pm_close(pmf);
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return PM_CD;
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}
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for (i = 0; i < array_size(sms_offsets); i++) {
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if (pm_seek(pmf, sms_offsets[i], SEEK_SET) != sms_offsets[i])
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goto not_mark3; /* actually it could be but can't be detected */
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if (pm_read(buff, 16, pmf) != 16)
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goto not_mark3;
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if (strncasecmp("TMR SEGA", buff, 8) == 0) {
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pm_close(pmf);
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return PM_MARK3;
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}
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}
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not_mark3:
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pm_close(pmf);
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/* the main emu function is to emulate MD, so assume MD */
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return PM_MD_CART;
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}
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static int extract_text(char *dest, const unsigned char *src, int len, int swab)
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{
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char *p = dest;
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@ -321,6 +372,7 @@ static void shutdown_MCD(void)
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}
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// note: this function might mangle rom_fname
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// XXX: portions of this code should move to pico/
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int emu_reload_rom(char *rom_fname)
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{
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unsigned int rom_size = 0;
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@ -328,20 +380,14 @@ int emu_reload_rom(char *rom_fname)
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unsigned char *rom_data = NULL;
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char ext[5];
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pm_file *rom = NULL;
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int ret, cd_state, cd_region, cfg_loaded = 0;
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int cd_state = CIT_NOT_CD;
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int ret, media_type, cd_region;
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int cfg_loaded = 0, bad_rom = 0;
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lprintf("emu_ReloadRom(%s)\n", rom_fname);
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get_ext(rom_fname, ext);
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// detect wrong extensions
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if (!strcmp(ext, ".srm") || !strcmp(ext, "s.gz") || !strcmp(ext, ".mds")) { // s.gz ~ .mds.gz
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me_update_msg("Not a ROM/CD selected.");
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return 0;
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}
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PicoPatchUnload();
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// check for movie file
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if (movie_data) {
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free(movie_data);
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@ -396,46 +442,53 @@ int emu_reload_rom(char *rom_fname)
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get_ext(rom_fname, ext);
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}
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media_type = detect_media(rom_fname);
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if (media_type == PM_BAD) {
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me_update_msg("Not a ROM/CD img selected.");
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return 0;
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}
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shutdown_MCD();
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PicoPatchUnload();
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// check for MegaCD image
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cd_state = emu_cd_check(&cd_region, rom_fname);
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if (cd_state >= 0 && cd_state != CIT_NOT_CD)
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if (media_type == PM_CD)
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{
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PicoAHW |= PAHW_MCD;
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// valid CD image, check for BIOS..
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// check for MegaCD image
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cd_state = emu_cd_check(&cd_region, rom_fname);
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if (cd_state >= 0 && cd_state != CIT_NOT_CD)
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{
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// valid CD image, check for BIOS..
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// we need to have config loaded at this point
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ret = emu_read_config(1, 0);
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if (!ret) emu_read_config(0, 0);
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cfg_loaded = 1;
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// we need to have config loaded at this point
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ret = emu_read_config(1, 0);
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if (!ret) emu_read_config(0, 0);
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cfg_loaded = 1;
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if (PicoRegionOverride) {
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cd_region = PicoRegionOverride;
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lprintf("overrided region to %s\n", cd_region != 4 ? (cd_region == 8 ? "EU" : "JAP") : "USA");
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if (PicoRegionOverride) {
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cd_region = PicoRegionOverride;
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lprintf("override region to %s\n", cd_region != 4 ?
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(cd_region == 8 ? "EU" : "JAP") : "USA");
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}
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if (!find_bios(cd_region, &used_rom_name))
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return 0;
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get_ext(used_rom_name, ext);
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PicoAHW |= PAHW_MCD;
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}
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if (!find_bios(cd_region, &used_rom_name)) {
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PicoAHW &= ~PAHW_MCD;
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else {
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me_update_msg("Invalid CD image");
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return 0;
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}
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get_ext(used_rom_name, ext);
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}
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else
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{
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if (PicoAHW & PAHW_MCD) Stop_CD();
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PicoAHW &= ~PAHW_MCD;
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else if (media_type == PM_MARK3) {
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lprintf("detected SMS ROM\n");
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PicoAHW = PAHW_SMS;
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}
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rom = pm_open(used_rom_name);
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if (!rom) {
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me_update_msg("Failed to open ROM/CD image");
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goto fail;
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}
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if (cd_state < 0) {
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me_update_msg("Invalid CD image");
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goto fail;
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if (rom == NULL) {
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me_update_msg("Failed to open ROM");
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return 0;
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}
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menu_romload_prepare(used_rom_name); // also CD load
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@ -443,21 +496,29 @@ int emu_reload_rom(char *rom_fname)
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PicoCartUnload();
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rom_loaded = 0;
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if ( (ret = PicoCartLoad(rom, &rom_data, &rom_size)) ) {
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ret = PicoCartLoad(rom, &rom_data, &rom_size, (PicoAHW & PAHW_SMS) ? 1 : 0);
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pm_close(rom);
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if (ret != 0) {
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if (ret == 2) me_update_msg("Out of memory");
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else if (ret == 3) me_update_msg("Read failed");
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else me_update_msg("PicoCartLoad() failed.");
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goto fail2;
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goto fail;
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}
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pm_close(rom);
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rom = NULL;
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// detect wrong files (Pico crashes on very small files), also see if ROM EP is good
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if (rom_size <= 0x200 || strncmp((char *)rom_data, "Pico", 4) == 0 ||
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((*(unsigned char *)(rom_data+4)<<16)|(*(unsigned short *)(rom_data+6))) >= (int)rom_size) {
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if (rom_data) free(rom_data);
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me_update_msg("Not a ROM selected.");
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goto fail2;
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// detect wrong files
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if (strncmp((char *)rom_data, "Pico", 4) == 0)
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bad_rom = 1;
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else if (!(PicoAHW & PAHW_SMS)) {
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unsigned short *d = (unsigned short *)(rom_data + 4);
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if ((((d[0] << 16) | d[1]) & 0xffffff) >= (int)rom_size) {
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lprintf("bad reset vector\n");
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bad_rom = 1;
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}
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}
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if (bad_rom) {
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me_update_msg("Bad ROM detected.");
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goto fail;
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}
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// load config for this ROM (do this before insert to get correct region)
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@ -468,18 +529,19 @@ int emu_reload_rom(char *rom_fname)
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if (!ret) emu_read_config(0, 0);
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}
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lprintf("PicoCartInsert(%p, %d);\n", rom_data, rom_size);
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if (PicoCartInsert(rom_data, rom_size)) {
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me_update_msg("Failed to load ROM.");
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goto fail2;
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goto fail;
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}
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// insert CD if it was detected
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if (cd_state != CIT_NOT_CD) {
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ret = Insert_CD(rom_fname, cd_state);
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if (ret != 0) {
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PicoCartUnload();
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rom_data = NULL; // freed by unload
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me_update_msg("Insert_CD() failed, invalid CD image?");
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goto fail2;
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goto fail;
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}
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}
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@ -511,8 +573,22 @@ int emu_reload_rom(char *rom_fname)
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}
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else
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{
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const char *sys_name, *tv_standard;
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int fps;
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if (PicoAHW & PAHW_SMS) {
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sys_name = "Master System";
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} else {
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sys_name = "MegaDrive";
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if ((Pico.m.hardware&0xc0) == 0x80)
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sys_name = "Genesis";
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}
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tv_standard = Pico.m.pal ? "PAL" : "NTSC";
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fps = Pico.m.pal ? 50 : 60;
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emu_status_msg("%s %s / %dFPS", tv_standard, sys_name, fps);
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PicoOpt &= ~POPT_DIS_VDP_FIFO;
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emu_status_msg(Pico.m.pal ? "PAL SYSTEM / 50 FPS" : "NTSC SYSTEM / 60 FPS");
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}
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strncpy(rom_fname_loaded, rom_fname, sizeof(rom_fname_loaded)-1);
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@ -525,10 +601,10 @@ int emu_reload_rom(char *rom_fname)
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return 1;
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fail2:
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menu_romload_end();
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fail:
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if (rom != NULL) pm_close(rom);
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if (rom_data)
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free(rom_data);
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menu_romload_end();
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return 0;
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}
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