35  * - NetBSD libi386/biosdisk.c
36  * - FreeBSD biosboot/disk.c
197 	if (dev->dv_type == DEVT_DISK)  in bd_get_bdinfo_list()
199 	if (dev->dv_type == DEVT_CD)  in bd_get_bdinfo_list()
201 	if (dev->dv_type == DEVT_FD)  in bd_get_bdinfo_list()
214 	bdi = bd_get_bdinfo_list(dev->d_dev);  in bd_get_bdinfo()
220 		if (unit == dev->d_unit)  in bd_get_bdinfo()
241 			if (bd->bd_unit == biosdev) {  in bd_bios2unit()
243 				    bd->bd_unit);  in bd_bios2unit()
249 	return (-1);  in bd_bios2unit()
259 	bdi = bd_get_bdinfo_list(dev->dd.d_dev);  in bd_unit2bios()
261 		return (-1);  in bd_unit2bios()
265 		if (unit == dev->dd.d_unit)  in bd_unit2bios()
266 			return (bd->bd_unit);  in bd_unit2bios()
269 	return (-1);  in bd_unit2bios()
273  * Use INT13 AH=15 - Read Drive Type.
313 		bd->bd_sectorsize = BIOSDISK_SECSIZE;  in fd_init()
314 		bd->bd_flags = BD_FLOPPY;  in fd_init()
315 		bd->bd_unit = unit;  in fd_init()
322 		if (bd->bd_sectors == 0)  in fd_init()
323 			bd->bd_flags |= BD_NO_MEDIA;  in fd_init()
346 		bd->bd_unit = base + unit;  in bd_init()
372  * Information from bootable CD-ROM.
378 	int ret = -1;  in bd_get_diskinfo_cd()
381 	/* Set sp_size as per specification. */  in bd_get_diskinfo_cd()
382 	bc_sp.sp_size = sizeof (bc_sp) - sizeof (bc_sp.sp_dummy);  in bd_get_diskinfo_cd()
387 	v86.edx = bd->bd_unit;  in bd_get_diskinfo_cd()
393 	    bc_sp.sp_drive == bd->bd_unit) {  in bd_get_diskinfo_cd()
394 		bd->bd_cyl = ((bc_sp.sp_cylsec & 0xc0) << 2) +  in bd_get_diskinfo_cd()
396 		bd->bd_sec = bc_sp.sp_cylsec & 0x3f;  in bd_get_diskinfo_cd()
397 		bd->bd_hds = bc_sp.sp_head + 1;  in bd_get_diskinfo_cd()
398 		bd->bd_sectors = (uint64_t)bd->bd_cyl * bd->bd_hds * bd->bd_sec;  in bd_get_diskinfo_cd()
401 			/* Floppy or hard-disk emulation */  in bd_get_diskinfo_cd()
402 			bd->bd_sectorsize = BIOSDISK_SECSIZE;  in bd_get_diskinfo_cd()
403 			return (-1);  in bd_get_diskinfo_cd()
405 			bd->bd_sectorsize = 2048;  in bd_get_diskinfo_cd()
406 			bd->bd_flags = BD_MODEEDD | BD_CDROM;  in bd_get_diskinfo_cd()
412 	 * If this is the boot_drive, default to non-emulation bootable CD-ROM.  in bd_get_diskinfo_cd()
414 	if (ret != 0 && bd->bd_unit >= 0x88) {  in bd_get_diskinfo_cd()
415 		bd->bd_cyl = 0;  in bd_get_diskinfo_cd()
416 		bd->bd_hds = 1;  in bd_get_diskinfo_cd()
417 		bd->bd_sec = 15;  in bd_get_diskinfo_cd()
418 		bd->bd_sectorsize = 2048;  in bd_get_diskinfo_cd()
419 		bd->bd_flags = BD_MODEEDD | BD_CDROM;  in bd_get_diskinfo_cd()
420 		bd->bd_sectors = 0;  in bd_get_diskinfo_cd()
426 	 * here - some systems do get hung with those.  in bd_get_diskinfo_cd()
433 	if (bd->bd_sectors == 0)  in bd_get_diskinfo_cd()
434 		bd->bd_sectors = 4173824;  in bd_get_diskinfo_cd()
446 		return (-1);  in bc_add()
449 		return (-1);  in bc_add()
451 	bd->bd_unit = biosdev;  in bc_add()
454 		return (-1);  in bc_add()
486 	/* extended disk access functions (AH=42h-44h,47h,48h) supported */  in bd_check_extensions()
514 	v86.edx = bd->bd_unit;  in bd_get_diskinfo_std()
524 	bd->bd_cyl = ((v86.ecx & 0xc0) << 2) + ((v86.ecx & 0xff00) >> 8) + 1;  in bd_get_diskinfo_std()
525 	/* Convert max head # -> # of heads */  in bd_get_diskinfo_std()
526 	bd->bd_hds = ((v86.edx & 0xff00) >> 8) + 1;  in bd_get_diskinfo_std()
527 	bd->bd_sec = v86.ecx & 0x3f;  in bd_get_diskinfo_std()
528 	bd->bd_type = v86.ebx;  in bd_get_diskinfo_std()
529 	bd->bd_sectors = (uint64_t)bd->bd_cyl * bd->bd_hds * bd->bd_sec;  in bd_get_diskinfo_std()
554 	params->len = sizeof (struct edd_params_v3);  in bd_get_diskinfo_ext()
558 	v86.edx = bd->bd_unit;  in bd_get_diskinfo_ext()
572 	if (params->sector_size >= 512 &&  in bd_get_diskinfo_ext()
573 	    params->sector_size <= 16384 &&  in bd_get_diskinfo_ext()
574 	    (params->sector_size % BIOSDISK_SECSIZE) == 0)  in bd_get_diskinfo_ext()
575 		bd->bd_sectorsize = params->sector_size;  in bd_get_diskinfo_ext()
577 	bd->bd_cyl = params->cylinders;  in bd_get_diskinfo_ext()
578 	bd->bd_hds = params->heads;  in bd_get_diskinfo_ext()
579 	bd->bd_sec = params->sectors_per_track;  in bd_get_diskinfo_ext()
581 	if (params->sectors != 0) {  in bd_get_diskinfo_ext()
582 		total = params->sectors;  in bd_get_diskinfo_ext()
584 		total = (uint64_t)params->cylinders *  in bd_get_diskinfo_ext()
585 		    params->heads * params->sectors_per_track;  in bd_get_diskinfo_ext()
587 	bd->bd_sectors = total;  in bd_get_diskinfo_ext()
600 	bd->bd_flags &= ~BD_NO_MEDIA;  in bd_int13probe()
602 	if ((bd->bd_flags & BD_CDROM) != 0) {  in bd_int13probe()
606 	edd = bd_check_extensions(bd->bd_unit);  in bd_int13probe()
608 		bd->bd_flags |= BD_MODEINT13;  in bd_int13probe()
610 		bd->bd_flags |= BD_MODEEDD1;  in bd_int13probe()
612 		bd->bd_flags |= BD_MODEEDD3;  in bd_int13probe()
615 	if (bd->bd_sectorsize == 0)  in bd_int13probe()
616 		bd->bd_sectorsize = BIOSDISK_SECSIZE;  in bd_int13probe()
622 	if (bd->bd_unit < 0x80) {  in bd_int13probe()
624 		bd_reset_disk(bd->bd_unit);  in bd_int13probe()
630 		v86.edx = bd->bd_unit;  in bd_int13probe()
639 	if (ret != 0 || bd->bd_sectors == 0)  in bd_int13probe()
642 	if (ret != 0 && bd->bd_unit < 0x80) {  in bd_int13probe()
644 		bd->bd_cyl = 80;  in bd_int13probe()
645 		bd->bd_hds = 2;  in bd_int13probe()
646 		bd->bd_sec = 18;  in bd_int13probe()
647 		bd->bd_sectors = 2880;  in bd_int13probe()
649 		bd->bd_flags |= BD_NO_MEDIA;  in bd_int13probe()
654 		if (bd->bd_sectors != 0 && edd != 0) {  in bd_int13probe()
655 			bd->bd_sec = 63;  in bd_int13probe()
656 			bd->bd_hds = 255;  in bd_int13probe()
657 			bd->bd_cyl =  in bd_int13probe()
658 			    (bd->bd_sectors + bd->bd_sec * bd->bd_hds - 1) /  in bd_int13probe()
659 			    bd->bd_sec * bd->bd_hds;  in bd_int13probe()
663 			if ((bd->bd_flags & BD_FLOPPY) != 0)  in bd_int13probe()
669 			    dv_name, bd->bd_unit);  in bd_int13probe()
674 	if (bd->bd_sec == 0)  in bd_int13probe()
675 		bd->bd_sec = 63;  in bd_int13probe()
676 	if (bd->bd_hds == 0)  in bd_int13probe()
677 		bd->bd_hds = 255;  in bd_int13probe()
679 	if (bd->bd_sectors == 0)  in bd_int13probe()
680 		bd->bd_sectors = (uint64_t)bd->bd_cyl * bd->bd_hds * bd->bd_sec;  in bd_int13probe()
682 	DPRINTF("unit 0x%x geometry %d/%d/%d\n", bd->bd_unit, bd->bd_cyl,  in bd_int13probe()
683 	    bd->bd_hds, bd->bd_sec);  in bd_int13probe()
706 	char line[80];  in bd_print_common()  local
715 	printf("%s devices:", dev->dv_name);  in bd_print_common()
719 	i = -1;  in bd_print_common()
723 		switch (dev->dv_type) {  in bd_print_common()
735 		snprintf(line, sizeof (line),  in bd_print_common()
737 		    dev->dv_name, i, drive + i,  in bd_print_common()
738 		    (bd->bd_flags & BD_NO_MEDIA) == BD_NO_MEDIA ?  in bd_print_common()
740 		    (uintmax_t)bd->bd_sectors,  in bd_print_common()
741 		    bd->bd_sectorsize);  in bd_print_common()
742 		if ((ret = pager_output(line)) != 0)  in bd_print_common()
745 		if ((bd->bd_flags & BD_NO_MEDIA) == BD_NO_MEDIA)  in bd_print_common()
748 		if (dev->dv_type != DEVT_DISK)  in bd_print_common()
756 		    bd->bd_sectorsize * bd->bd_sectors,  in bd_print_common()
757 		    bd->bd_sectorsize) == 0) {  in bd_print_common()
758 			snprintf(line, sizeof (line), "    %s%d",  in bd_print_common()
759 			    dev->dv_name, i);  in bd_print_common()
760 			ret = disk_print(&devd, line, verbose);  in bd_print_common()
801 	bd = bd_get_bdinfo(&dev->dd);  in bd_disk_get_sectors()
805 	disk.dd.d_dev = dev->dd.d_dev;  in bd_disk_get_sectors()
806 	disk.dd.d_unit = dev->dd.d_unit;  in bd_disk_get_sectors()
811 	size = bd->bd_sectors * bd->bd_sectorsize;  in bd_disk_get_sectors()
812 	if (disk_open(&disk, size, bd->bd_sectorsize) == 0) {  in bd_disk_get_sectors()
816 	return (size / bd->bd_sectorsize);  in bd_disk_get_sectors()
825  * (eg. given no slice or partition value, with a disk that is
826  *  sliced - are they after the first BSD slice, or the DOS
827  *  slice before it?)
841 	bd = bd_get_bdinfo(&dev->dd);  in bd_open()
845 	if ((bd->bd_flags & BD_NO_MEDIA) == BD_NO_MEDIA) {  in bd_open()
848 		if ((bd->bd_flags & BD_NO_MEDIA) == BD_NO_MEDIA)  in bd_open()
851 	if (bd->bd_bcache == NULL)  in bd_open()
852 		bd->bd_bcache = bcache_allocate();  in bd_open()
854 	if (bd->bd_open == 0)  in bd_open()
855 		bd->bd_sectors = bd_disk_get_sectors(dev);  in bd_open()
856 	bd->bd_open++;  in bd_open()
859 	if (dev->dd.d_dev->dv_type == DEVT_DISK) {  in bd_open()
860 		rc = disk_open(dev, bd->bd_sectors * bd->bd_sectorsize,  in bd_open()
861 		    bd->bd_sectorsize);  in bd_open()
863 			bd->bd_open--;  in bd_open()
864 			if (bd->bd_open == 0) {  in bd_open()
865 				bcache_free(bd->bd_bcache);  in bd_open()
866 				bd->bd_bcache = NULL;  in bd_open()
880 	dev = (struct disk_devdesc *)f->f_devdata;  in bd_close()
881 	bd = bd_get_bdinfo(&dev->dd);  in bd_close()
885 	bd->bd_open--;  in bd_close()
886 	if (bd->bd_open == 0) {  in bd_close()
887 		bcache_free(bd->bd_bcache);  in bd_close()
888 		bd->bd_bcache = NULL;  in bd_close()
890 	if (dev->dd.d_dev->dv_type == DEVT_DISK)  in bd_close()
902 	dev = (struct disk_devdesc *)f->f_devdata;  in bd_ioctl()
903 	bd = bd_get_bdinfo(&dev->dd);  in bd_ioctl()
907 	if (dev->dd.d_dev->dv_type == DEVT_DISK) {  in bd_ioctl()
915 		*(uint32_t *)data = bd->bd_sectorsize;  in bd_ioctl()
918 		*(uint64_t *)data = bd->bd_sectors * bd->bd_sectorsize;  in bd_ioctl()
936 	bd = bd_get_bdinfo(&dev->dd);  in bd_strategy()
942 	bcd.dv_cache = bd->bd_bcache;  in bd_strategy()
945 	if (dev->dd.d_dev->dv_type == DEVT_DISK) {  in bd_strategy()
947 		offset = dev->d_offset * bd->bd_sectorsize;  in bd_strategy()
965 	bd = bd_get_bdinfo(&dev->dd);  in bd_realstrategy()
966 	if (bd == NULL || (bd->bd_flags & BD_NO_MEDIA) == BD_NO_MEDIA)  in bd_realstrategy()
984 	dblk = offset / bd->bd_sectorsize;  in bd_realstrategy()
985 	blkoff = offset % bd->bd_sectorsize;  in bd_realstrategy()
998 	blks = size / bd->bd_sectorsize;  in bd_realstrategy()
999 	if (blks == 0 || (size % bd->bd_sectorsize) != 0)  in bd_realstrategy()
1014 	if (dev->dd.d_dev->dv_type == DEVT_DISK) {  in bd_realstrategy()
1017 			disk_blocks /= bd->bd_sectorsize;  in bd_realstrategy()
1019 		d_offset = dev->d_offset;  in bd_realstrategy()
1022 		disk_blocks = bd->bd_sectors - d_offset;  in bd_realstrategy()
1032 		blks = d_offset + disk_blocks - dblk;  in bd_realstrategy()
1033 		size = blks * bd->bd_sectorsize;  in bd_realstrategy()
1038 	while (bio_size > bd->bd_sectorsize) {  in bd_realstrategy()
1042 		bio_size -= bd->bd_sectorsize;  in bd_realstrategy()
1046 		if (bio_size < bd->bd_sectorsize)  in bd_realstrategy()
1055 		int x = min(blks, bio_size / bd->bd_sectorsize);  in bd_realstrategy()
1060 			bsize = bd->bd_sectorsize * x - blkoff;  in bd_realstrategy()
1079 				bsize = bd->bd_sectorsize - blkoff;  in bd_realstrategy()
1082 			} else if (rest < bd->bd_sectorsize) {  in bd_realstrategy()
1092 				bsize = bd->bd_sectorsize * x;  in bd_realstrategy()
1112 		rest -= bsize;  in bd_realstrategy()
1113 		blks -= x;  in bd_realstrategy()
1142 	v86.edx = bd->bd_unit;  in bd_edd_io()
1157 	bpc = bd->bd_sec * bd->bd_hds;	/* blocks per cylinder */  in bd_chs_io()
1159 	cyl = x / bpc;			/* block # / blocks per cylinder */  in bd_chs_io()
1161 	hd = x / bd->bd_sec;		/* offset / blocks per track */  in bd_chs_io()
1162 	sec = x % bd->bd_sec;		/* offset into track */  in bd_chs_io()
1164 	/* correct sector number for 1-based BIOS numbering */  in bd_chs_io()
1179 	v86.edx = (hd << 8) | bd->bd_unit;  in bd_chs_io()
1202 	/* Just in case some idiot actually tries to read/write -1 blocks... */  in bd_io()
1204 		return (-1);  in bd_io()
1220 		if (bd->bd_flags & BD_MODEEDD)  in bd_io()
1226 			if (bd->bd_flags & BD_NO_MEDIA)  in bd_io()
1227 				bd->bd_flags &= ~BD_NO_MEDIA;  in bd_io()
1231 		bd_reset_disk(bd->bd_unit);  in bd_io()
1241 			bd->bd_flags |= BD_NO_MEDIA;  in bd_io()
1246 	if (result != 0 && (bd->bd_flags & BD_NO_MEDIA) == 0) {  in bd_io()
1249 			    "to %lld: 0x%x\n", dev->dd.d_dev->dv_name,  in bd_io()
1250 			    dev->dd.d_unit, blks, dest, VTOP(dest), dblk,  in bd_io()
1254 			    "(0x%x): 0x%x\n", dev->dd.d_dev->dv_name,  in bd_io()
1255 			    dev->dd.d_unit, blks, dblk, dest, VTOP(dest),  in bd_io()
1273  * indicated by returning the geometry of a "1.2M" PC-format floppy
1307 	int	i, unit, slice, partition;  in bd_getdev()  local
1310 	slice = 0;  in bd_getdev()
1314 	bd = bd_get_bdinfo(&dev->dd);  in bd_getdev()
1316 		return (-1);  in bd_getdev()
1319 	DPRINTF("unit %d BIOS device %d", dev->dd.d_unit, biosdev);  in bd_getdev()
1320 	if (biosdev == -1)			/* not a BIOS device */  in bd_getdev()
1321 		return (-1);  in bd_getdev()
1323 	if (dev->dd.d_dev->dv_type == DEVT_DISK) {  in bd_getdev()
1324 		if (disk_open(dev, bd->bd_sectors * bd->bd_sectorsize,  in bd_getdev()
1325 		    bd->bd_sectorsize) != 0)	/* oops, not a viable device */  in bd_getdev()
1326 			return (-1);  in bd_getdev()
1329 		slice = dev->d_slice + 1;  in bd_getdev()
1330 		partition = dev->d_partition;  in bd_getdev()
1335 		if (bd->bd_type == DT_ATAPI) {  in bd_getdev()
1349 	if (dev->dd.d_dev->dv_type == DEVT_CD) {  in bd_getdev()
1357 		 * we pass -C to the boot args if we are the boot device.  in bd_getdev()
1371 	rootdev = MAKEBOOTDEV(major, slice, unit, partition);  in bd_getdev()