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https://github.com/holub/mame
synced 2025-07-06 02:18:09 +03:00
Port from MESS
This commit is contained in:
Angelo Salese
parent
81036ed1f9
commit
4b3057cc4a
@ -2,7 +2,7 @@
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machine/stvcd.c - Sega Saturn and ST-V CD-ROM handling
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Rewritten (again) 2007 by R. Belmont.
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Another tilt at the windmill in 2011 by R. Belmont.
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Status: All known discs at least load their executable, and many load
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some data files successfully, but there are other problems.
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@ -41,7 +41,8 @@ static void cd_playdata(void);
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#define MAX_FILTERS (24)
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#define MAX_BLOCKS (200)
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#define MAX_DIR_SIZE (16384)
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#define MAX_DIR_SIZE (128*1024)
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#define CD_SPEED 75*1 /* TODO: should be x2 */
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typedef struct
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{
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@ -135,6 +136,7 @@ static UINT32 in_buffer = 0; // amount of data in the buffer
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static int oddframe = 0;
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static UINT32 fadstoplay = 0;
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static int buffull, sectorstore, freeblocks;
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static int cur_track;
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// iso9660 utilities
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static void read_new_dir(running_machine &machine, UINT32 fileno);
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@ -192,11 +194,18 @@ TIMER_DEVICE_CALLBACK( stv_sector_cb )
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cd_stat |= CD_STAT_PERI;
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cr1 = cd_stat;
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cr2 = 0x4101;
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if (cur_track == 0xff)
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{
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cr2 = 0xffff;
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}
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else
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{
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cr2 = cdrom_get_adr_control(cdrom, cur_track)<<8 | cur_track;
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}
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cr3 = (cd_curfad>>16)&0xff;
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cr4 = cd_curfad;
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timer.adjust(attotime::from_hz(150));
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timer.adjust(attotime::from_hz(CD_SPEED));
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}
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// global functions
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@ -211,6 +220,7 @@ void stvcd_reset(running_machine &machine)
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cr3 = ('L'<<8) | 'O';
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cr4 = ('C'<<8) | 'K';
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cd_stat = CD_STAT_PAUSE;
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cur_track = 0xff;
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if (curdir != (direntryT *)NULL)
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auto_free(machine, curdir);
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@ -272,7 +282,7 @@ void stvcd_reset(running_machine &machine)
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}
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sector_timer = machine.device<timer_device>("sector_timer");
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sector_timer->adjust(attotime::from_hz(150)); // 150 sectors / second = 300kBytes/second
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sector_timer->adjust(attotime::from_hz(CD_SPEED)); // 150 sectors / second = 300kBytes/second
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}
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static blockT *cd_alloc_block(UINT8 *blknum)
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@ -377,7 +387,7 @@ static UINT16 cd_readWord(UINT32 addr)
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hirqreg = rv;
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// CDROM_LOG(("%s:RW HIRQ: %04x\n", Machine->describe_context(), rv))
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// CDROM_LOG(("RW HIRQ: %04x\n", rv))
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return rv;
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@ -412,6 +422,7 @@ static UINT16 cd_readWord(UINT32 addr)
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{
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case XFERTYPE_TOC:
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rv = tocbuf[xfercount]<<8 | tocbuf[xfercount+1];
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xfercount += 2;
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xferdnum += 2;
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@ -443,7 +454,7 @@ static UINT16 cd_readWord(UINT32 addr)
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return rv;
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default:
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CDROM_LOG(("%s:CD: RW %08x\n", machine.describe_context(), addr))
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CDROM_LOG(("CD: RW %08x\n", addr))
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return 0xffff;
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}
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@ -517,7 +528,7 @@ static UINT32 cd_readLong(UINT32 addr)
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return rv;
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default:
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CDROM_LOG(("%s:CD: RL %08x\n", machine.describe_context(), addr))
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CDROM_LOG(("CD: RL %08x\n", addr))
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return 0xffff;
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}
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}
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@ -574,11 +585,16 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
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{
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case 0x0000:
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CDROM_LOG(("%s:CD: Get Status\n", machine.describe_context()))
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// values taken from a US saturn with a disc in and the lid closed
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hirqreg |= CMOK;
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cr1 = cd_stat;
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cr2 = 0x4101;
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if (cur_track == 0xff)
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{
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cr2 = 0xffff;
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}
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else
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{
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cr2 = cdrom_get_adr_control(cdrom, cur_track)<<8 | cur_track;
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}
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cr3 = 0x100 | (cd_curfad>>16);
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cr4 = cd_curfad;
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CDROM_LOG((" = %04x %04x %04x %04x %04x\n", hirqreg, cr1, cr2, cr3, cr4))
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@ -629,7 +645,8 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
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break;
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}
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cd_stat = CD_STAT_PAUSE;
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cr1 = cd_stat << 8;
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cr1 = cd_stat;
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cr2 = 0;
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hirqreg |= (CMOK);
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break;
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@ -729,30 +746,42 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
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CDROM_LOG((" = %04x %04x %04x %04x %04x\n", hirqreg, cr1, cr2, cr3, cr4))
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break;
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case 0x1000: // Play Disk. FAD is in lowest 7 bits of cr1 and all of cr2.
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CDROM_LOG(("%s:CD: Play Disk\n", machine.describe_context()))
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cd_stat = CD_STAT_PLAY; //|0x80; // set "cd-rom" bit?
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cd_curfad = ((cr1&0xff)<<16) | cr2;
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fadstoplay = ((cr3&0xff)<<16) | cr4;
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case 0x1000: // Play Disc. FAD is in lowest 7 bits of cr1 and all of cr2.
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CDROM_LOG(("%s:CD: Play Disc\n", machine.describe_context()))
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cd_stat = CD_STAT_PLAY;
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if (cd_curfad & 0x800000)
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if (!(cr3 & 0x8000)) // preserve current position if bit 7 set
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{
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if (cd_curfad != 0xffffff)
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cd_curfad = ((cr1&0xff)<<16) | cr2;
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fadstoplay = ((cr3&0xff)<<16) | cr4;
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if (cd_curfad & 0x800000)
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{
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// fad mode
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cd_curfad &= 0xfffff;
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fadstoplay &= 0xfffff;
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if (cd_curfad != 0xffffff)
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{
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// fad mode
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cd_curfad &= 0xfffff;
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fadstoplay &= 0xfffff;
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}
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cur_track = cdrom_get_track(cdrom, cd_curfad-150);
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}
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else
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{
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// track mode
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cur_track = cd_curfad>>8;
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cd_curfad = cdrom_get_track_start(cdrom, cur_track-1);
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fadstoplay = cdrom_get_track_start(cdrom, cur_track) - cd_curfad;
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}
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}
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else
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else // play until the end of the disc
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{
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// track mode
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mame_printf_error("CD: Play Disk track mode, not yet implemented\n");
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fadstoplay = cdrom_get_track_start(cdrom, 0xaa) + 150;
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}
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CDROM_LOG(("CD: Play Disk: start %x length %x\n", cd_curfad, fadstoplay))
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CDROM_LOG(("CD: Play Disc: start %x length %x\n", cd_curfad, fadstoplay))
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cr2 = 0x4101; // ctrl/adr in hi byte, track # in low byte
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cr2 = cdrom_get_adr_control(cdrom, cur_track)<<8 | cur_track;
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cr3 = (0x100) | ((cd_curfad>>16)&0xff); // index of subcode in hi byte, frame address
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cr4 = cd_curfad & 0xffff;
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hirqreg |= (CMOK|DRDY);
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@ -764,23 +793,19 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
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// and do the disc I/O
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// make sure it doesn't come in too early
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sector_timer->reset();
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sector_timer->adjust(attotime::from_hz(150)); // 150 sectors / second = 300kBytes/second
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sector_timer->adjust(attotime::from_hz(CD_SPEED)); // 150 sectors / second = 300kBytes/second
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break;
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case 0x1100: // disk seek
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CDROM_LOG(("%s:CD: Disk seek\n", machine.describe_context()))
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case 0x1100: // disc seek
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CDROM_LOG(("%s:CD: Disc seek\n", machine.describe_context()))
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if (cr1 & 0x80)
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{
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temp = (cr1&0x7f)<<16; // get FAD to seek to
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temp |= cr2;
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if (temp == 0xffffff)
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cd_stat = CD_STAT_PAUSE;
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if (temp != 0xffffff)
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{
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cd_stat = CD_STAT_PAUSE;
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}
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else
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{
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CDROM_LOG(("CD: not clear how to handle FAD seek\n"))
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cd_curfad = temp;
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}
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}
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@ -790,19 +815,21 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
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if (cr2 >> 8)
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{
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cd_stat = CD_STAT_PAUSE;
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cur_track = cr2>>8;;
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// (index is cr2 low byte)
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}
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else
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{
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cd_stat = CD_STAT_STANDBY;
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cd_curfad = 0xffffffff;
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cur_track = 0xff;
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}
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}
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hirqreg |= CMOK;
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cr1 = cd_stat;
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cr2 = 0x4101;
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cr2 = cdrom_get_adr_control(cdrom, cur_track)<<8 | cur_track;
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cr3 = (cd_curfad>>16)&0xff;
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cr4 = cd_curfad;
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break;
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@ -933,7 +960,7 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
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cr3 = 0x1800;
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cr4 = 200;
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CDROM_LOG(("%s:CD: Get Buffer Size = %d\n", cr2, machine.describe_context()))
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CDROM_LOG(("CD: Get Buffer Size = %d\n", cr2))
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hirqreg |= (CMOK|ESEL|DRDY); // DRDY is probably wrong
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break;
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@ -1183,7 +1210,7 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
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break;
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case 0x7200: // Get file system scope
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CDROM_LOG(("%s:CD: Get file system scope(PC=%x)\n", machine.describe_context()))
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CDROM_LOG(("CD: Get file system scope\n"))
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hirqreg |= (CMOK|DRDY);
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cr2 = numfiles; // # of files in directory
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cr3 = 0x0100; // report directory held
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@ -1250,7 +1277,8 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
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temp |= cr4;
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cd_stat = CD_STAT_PLAY|0x80; // set "cd-rom" bit
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cr2 = 0x4101; // CTRL/track
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cur_track = cdrom_get_track(cdrom, curdir[temp].firstfad-150);
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cr2 = cdrom_get_adr_control(cdrom, cur_track)<<8 | cur_track;
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cr3 = (curdir[temp].firstfad>>16)&0xff;
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cr4 = (curdir[temp].firstfad&0xffff);
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@ -1272,7 +1300,7 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
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playtype = 1;
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// and do the disc I/O
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// sector_timer->adjust(attotime::from_hz(150)); // 150 sectors / second = 300kBytes/second
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// sector_timer->adjust(attotime::from_hz(CD_SPEED)); // 150 sectors / second = 300kBytes/second
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break;
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case 0x7500:
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@ -1301,14 +1329,14 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
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break;
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default:
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CDROM_LOG(("%s:CD: Unknown command %04x\n", cr1, machine.describe_context()))
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CDROM_LOG(("CD: Unknown command %04x\n", cr1))
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hirqreg |= (CMOK);
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break;
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}
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// CDROM_LOG(("ret: %04x %04x %04x %04x %04x\n", hirqreg, cr1, cr2, cr3, cr4))
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break;
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default:
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CDROM_LOG(("%s:CD: WW %08x %04x\n", addr, data, machine.describe_context()))
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CDROM_LOG(("CD: WW %08x %04x\n", addr, data))
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break;
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}
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}
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@ -1555,7 +1583,7 @@ void stvcd_exit(running_machine& machine)
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static void cd_readTOC(void)
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{
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int i, ntrks, /*toclen, */tocptr, fad;
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int i, ntrks, tocptr, fad;
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xfertype = XFERTYPE_TOC;
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xfercount = 0;
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@ -1569,8 +1597,6 @@ static void cd_readTOC(void)
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ntrks = 0;
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}
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//toclen = (4 * ntrks); // toclen header entry
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// data format for Saturn TOC:
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// no header.
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// 4 bytes per track
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@ -1589,20 +1615,26 @@ static void cd_readTOC(void)
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{
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tocbuf[tocptr] = cdrom_get_adr_control(cdrom, i)<<4 | 0x01;
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}
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else
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{
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tocbuf[tocptr] = 0xff;
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}
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if (cdrom)
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{
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fad = cdrom_get_track_start(cdrom, i) + 150;
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tocbuf[tocptr+1] = (fad>>16)&0xff;
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tocbuf[tocptr+2] = (fad>>8)&0xff;
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tocbuf[tocptr+3] = fad&0xff;
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}
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else
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{
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fad = 150;
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tocbuf[tocptr+1] = 0xff;
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tocbuf[tocptr+2] = 0xff;
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tocbuf[tocptr+3] = 0xff;
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}
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tocbuf[tocptr+1] = (fad>>16)&0xff;
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tocbuf[tocptr+2] = (fad>>8)&0xff;
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tocbuf[tocptr+3] = fad&0xff;
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tocptr += 4;
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}
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@ -1816,13 +1848,11 @@ static void cd_playdata(void)
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{
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if (fadstoplay)
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{
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logerror("STVCD: Reading FAD %d\n", cd_curfad);
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logerror("STVCD: Reading FAD %d\n", cd_curfad);
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if (cdrom)
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{
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//partitionT *playpart;
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/*playpart = */cd_read_filtered_sector(cd_curfad);
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cd_read_filtered_sector(cd_curfad);
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cd_curfad++;
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fadstoplay--;
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