pc98/libpc98/biosdisk.c

102 static int	bd_getgeom(struct open_disk *od);
103 static int	bd_read(struct open_disk *od, daddr_t dblk, int blks,
105 static int	bd_write(struct open_disk *od, daddr_t dblk, int blks,
110 static void	bd_printslice(struct open_disk *od, struct pc98_partition *dp,
112 static void	bd_printbsdslice(struct open_disk *od, daddr_t offset,
137 static void	bd_closedisk(struct open_disk *od);
138 static int	bd_open_pc98(struct open_disk *od, struct i386_devdesc *dev);
139 static int	bd_bestslice(struct open_disk *od);
140 static void	bd_checkextended(struct open_disk *od, int slicenum);
251     struct open_disk		*od;
263 	if (!bd_opendisk(&od, &dev)) {
266 	    if (od->od_flags & BD_PARTTABOK) {
267 		dptr = &od->od_slicetab[0];
270 		for (j = 0; j < od->od_nslices; j++) {
272 		    bd_printslice(od, &dptr[j], line, verbose);
275 	    bd_closedisk(od);
308 bd_printslice(struct open_disk *od, struct pc98_partition *dp, char *prefix,
315 	cylsecs = od->od_hds * od->od_sec;
316 	start = dp->dp_scyl * cylsecs + dp->dp_shd * od->od_sec + dp->dp_ssect;
327 		bd_printbsdslice(od, start, prefix, verbose);
354 bd_printbsdslice(struct open_disk *od, daddr_t offset, char *prefix,
363     if (bd_read(od, offset + LABELSECTOR, 1, buf))
384 	     (od->od_flags & BD_FLOPPY) && (i == 0))) {
421     struct open_disk		*od;
427     if ((error = bd_opendisk(&od, dev)))
433     ((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data = od;
434     DEBUG("open_disk %p, partition at 0x%x", od, od->od_boff);
441     struct open_disk		*od;
449     od = (struct open_disk *)malloc(sizeof(struct open_disk));
450     if (!od) {
456     od->od_dkunit = dev->d_unit;
457     od->od_unit = bdinfo[od->od_dkunit].bd_unit;
458     od->od_flags = bdinfo[od->od_dkunit].bd_flags;
459     od->od_boff = 0;
466     if (bd_getgeom(od)) {
473     error = bd_open_pc98(od, dev);
477 	free(od);
479 	*odp = od;	/* return the open disk */
485 bd_open_pc98(struct open_disk *od, struct i386_devdesc *dev)
501     od->od_nslices = 0;
502     if (od->od_flags & BD_FLOPPY) {
506     if (bd_read(od, 0, 1, buf)) {
523     if (bd_read(od, 1, 1, buf)) {
531     bcopy(buf + PC98_PARTOFF, &od->od_slicetab,
533     od->od_nslices = PC98_NPARTS;	/* extended slices start here */
534     od->od_flags |= BD_PARTTABOK;
535     dptr = &od->od_slicetab[0];
548         if (slice >= od->od_nslices) {
556 	slice = bd_bestslice(od);
563     dptr = &od->od_slicetab[0];
569     sector = dptr->dp_scyl * od->od_hds * od->od_sec +
570 	dptr->dp_shd * od->od_sec + dptr->dp_ssect;
572 	int end = dptr->dp_ecyl * od->od_hds * od->od_sec +
573 	    dptr->dp_ehd * od->od_sec + dptr->dp_esect;
592 	od->od_boff = sector;		/* no partition, must be after the slice */
596 	if (bd_read(od, sector + LABELSECTOR, 1, buf)) {
600 	DEBUG("copy %d bytes of label from %p to %p", sizeof(struct disklabel), buf + LABELOFFSET, &od->od_disklabel);
601 	bcopy(buf + LABELOFFSET, &od->od_disklabel, sizeof(struct disklabel));
602 	lp = &od->od_disklabel;
603 	od->od_flags |= BD_LABELOK;
618 	    !(od->od_flags & BD_FLOPPY))
622 	od->od_boff =
653 bd_bestslice(struct open_disk *od)
662 	dp = &od->od_slicetab[0];
663 	for (i = 0; i < od->od_nslices; i++, dp++) {
699     struct open_disk	*od = (struct open_disk *)(((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data);
701     bd_closedisk(od);
706 bd_closedisk(struct open_disk *od)
708     DEBUG("open_disk %p", od);
711     if (od->od_flags & BD_FLOPPY)
714     free(od);
721     struct open_disk	*od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data);
725     return(bcache_strategy(&bcd, od->od_unit, rw, dblk+od->od_boff, size, buf, rsize));
731     struct open_disk	*od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data);
743     DEBUG("open_disk %p", od);
752 	if (blks && bd_read(od, dblk, blks, buf)) {
759 	if (fragsize && bd_read(od, dblk + blks, 1, fragsize)) {
769 	if (blks && bd_write(od, dblk, blks, buf)) {
794 bd_chs_io(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest, int write)
798     bpc = (od->od_sec * od->od_hds);	/* blocks per cylinder */
802     hd = x / od->od_sec;		/* offset / blocks per track */
803     sec = x % od->od_sec;		/* offset into track */
808 	v86.eax = 0x0500 | od->od_unit;
810 	v86.eax = 0x0600 | od->od_unit;
811     if (od->od_flags & BD_FLOPPY) {
815     } else if (od->od_flags & BD_OPTICAL) {
831 bd_io(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest, int write)
855 	x = min(od->od_sec, (unsigned)blks);
874 	sec = dblk % od->od_sec;	/* offset into track */
875 	x = min(od->od_sec - sec, resid);
898 		v86.eax = 0x0300 | od->od_unit;
902 	    result = bd_chs_io(od, dblk, x, xp, write);
928 bd_read(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest)
931     return (bd_io(od, dblk, blks, dest, 0));
935 bd_write(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest)
938     return (bd_io(od, dblk, blks, dest, 1));
942 bd_getgeom(struct open_disk *od)
945     if (od->od_flags & BD_FLOPPY) {
946 	od->od_cyl = 79;
947 	od->od_hds = 2;
948 	od->od_sec = (od->od_unit & 0xf0) == 0x30 ? 18 : 15;
949     } else if (od->od_flags & BD_OPTICAL) {
950 	od->od_cyl = 0xFFFE;
951 	od->od_hds = 8;
952 	od->od_sec = 32;
956 	v86.eax = 0x8400 | od->od_unit;
959 	od->od_cyl = v86.ecx;
960 	od->od_hds = (v86.edx >> 8) & 0xff;
961 	od->od_sec = v86.edx & 0xff;
966     DEBUG("unit 0x%x geometry %d/%d/%d", od->od_unit, od->od_cyl, od->od_hds, od->od_sec);
1027     struct open_disk		*od;
1038     if (bd_opendisk(&od, dev) != 0)		/* oops, not a viable device */
1052 	if ((od->od_flags & BD_LABELOK) && (od->od_disklabel.d_type == DTYPE_SCSI)) {