2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
31 * BIOS disk device handling.
33 * Ideas and algorithms from:
35 * - NetBSD libi386/biosdisk.c
36 * - FreeBSD biosboot/disk.c
42 #include <sys/disklabel.h>
43 #include <sys/diskpc98.h>
44 #include <machine/bootinfo.h>
48 #include <bootstrap.h>
52 #define BIOS_NUMDRIVES 0x475
53 #define BIOSDISK_SECSIZE 512
54 #define BUFSIZE (1 * BIOSDISK_SECSIZE)
55 #define MAXBDDEV MAXDEV
57 #define DT_ATAPI 0x10 /* disk type for ATAPI floppies */
58 #define WDMAJOR 0 /* major numbers for devices we frontend for */
64 # define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args)
66 # define DEBUG(fmt, args...)
70 int od_dkunit; /* disk unit number */
71 int od_unit; /* BIOS unit number */
72 int od_cyl; /* BIOS geometry */
75 int od_boff; /* block offset from beginning of BIOS disk */
77 #define BD_MODEINT13 0x0000
78 #define BD_MODEEDD1 0x0001
79 #define BD_MODEEDD3 0x0002
80 #define BD_MODEMASK 0x0003
81 #define BD_FLOPPY 0x0004
82 #define BD_LABELOK 0x0008
83 #define BD_PARTTABOK 0x0010
84 #define BD_OPTICAL 0x0020
85 struct disklabel od_disklabel;
86 int od_nslices; /* slice count */
87 struct pc98_partition od_slicetab[NDOSPART];
91 * List of BIOS devices, translation from disk unit number to
96 int bd_unit; /* BIOS unit number */
98 int bd_type; /* BIOS 'drive type' (floppy only) */
99 int bd_da_unit; /* kernel unit number for da */
101 static int nbdinfo = 0;
103 static int bd_getgeom(struct open_disk *od);
104 static int bd_read(struct open_disk *od, daddr_t dblk, int blks,
106 static int bd_write(struct open_disk *od, daddr_t dblk, int blks,
109 static int bd_int13probe(struct bdinfo *bd);
111 static void bd_printslice(struct open_disk *od, struct pc98_partition *dp,
112 char *prefix, int verbose);
113 static void bd_printbsdslice(struct open_disk *od, daddr_t offset,
114 char *prefix, int verbose);
116 static int bd_init(void);
117 static int bd_strategy(void *devdata, int flag, daddr_t dblk,
118 size_t size, char *buf, size_t *rsize);
119 static int bd_realstrategy(void *devdata, int flag, daddr_t dblk,
120 size_t size, char *buf, size_t *rsize);
121 static int bd_open(struct open_file *f, ...);
122 static int bd_close(struct open_file *f);
123 static void bd_print(int verbose);
125 struct devsw biosdisk = {
137 static int bd_opendisk(struct open_disk **odp, struct i386_devdesc *dev);
138 static void bd_closedisk(struct open_disk *od);
139 static int bd_open_pc98(struct open_disk *od, struct i386_devdesc *dev);
140 static int bd_bestslice(struct open_disk *od);
141 static void bd_checkextended(struct open_disk *od, int slicenum);
144 * Translate between BIOS device numbers and our private unit numbers.
147 bd_bios2unit(int biosdev)
151 DEBUG("looking for bios device 0x%x", biosdev);
152 for (i = 0; i < nbdinfo; i++) {
153 DEBUG("bd unit %d is BIOS device 0x%x", i, bdinfo[i].bd_unit);
154 if (bdinfo[i].bd_unit == biosdev)
161 bd_unit2bios(int unit)
163 if ((unit >= 0) && (unit < nbdinfo))
164 return(bdinfo[unit].bd_unit);
169 * Quiz the BIOS for disk devices, save a little info about them.
175 int da_drive=0, n=-0x10;
177 /* sequence 0x90, 0x80, 0xa0 */
178 for (base = 0x90; base <= 0xa0; base += n, n += 0x30) {
179 for (unit = base; (nbdinfo < MAXBDDEV) || ((unit & 0x0f) < 4); unit++) {
180 bdinfo[nbdinfo].bd_unit = unit;
181 bdinfo[nbdinfo].bd_flags = (unit & 0xf0) == 0x90 ? BD_FLOPPY : 0;
183 if (!bd_int13probe(&bdinfo[nbdinfo])){
184 if (((unit & 0xf0) == 0x90 && (unit & 0x0f) < 4) ||
185 ((unit & 0xf0) == 0xa0 && (unit & 0x0f) < 6))
186 continue; /* Target IDs are not contiguous. */
191 if (bdinfo[nbdinfo].bd_flags & BD_FLOPPY){
192 /* available 1.44MB access? */
193 if (*(u_char *)PTOV(0xA15AE) & (1<<(unit & 0xf))) {
194 /* boot media 1.2MB FD? */
195 if ((*(u_char *)PTOV(0xA1584) & 0xf0) != 0x90)
196 bdinfo[nbdinfo].bd_unit = 0x30 + (unit & 0xf);
200 if ((unit & 0xF0) == 0xA0) /* SCSI HD or MO */
201 bdinfo[nbdinfo].bd_da_unit = da_drive++;
203 /* XXX we need "disk aliases" to make this simpler */
204 printf("BIOS drive %c: is disk%d\n",
205 'A' + nbdinfo, nbdinfo);
213 * Try to detect a device supported by the legacy int13 BIOS
216 bd_int13probe(struct bdinfo *bd)
220 if (bd->bd_flags & BD_FLOPPY) {
223 if ((bd->bd_unit & 0xf0) == 0x80)
228 if ( *(u_char *)PTOV(addr) & (1<<(bd->bd_unit & 0x0f))) {
229 bd->bd_flags |= BD_MODEINT13;
232 if ((bd->bd_unit & 0xF0) == 0xA0) {
233 int media = ((unsigned *)PTOV(0xA1460))[bd->bd_unit & 0x0F] & 0x1F;
235 if (media == 7) { /* MO */
236 bd->bd_flags |= BD_MODEINT13 | BD_OPTICAL;
244 * Print information about disks
247 bd_print(int verbose)
251 struct i386_devdesc dev;
252 struct open_disk *od;
253 struct pc98_partition *dptr;
255 for (i = 0; i < nbdinfo; i++) {
256 sprintf(line, " disk%d: BIOS drive %c:\n", i, 'A' + i);
259 /* try to open the whole disk */
261 dev.d_kind.biosdisk.slice = -1;
262 dev.d_kind.biosdisk.partition = -1;
264 if (!bd_opendisk(&od, &dev)) {
266 /* Do we have a partition table? */
267 if (od->od_flags & BD_PARTTABOK) {
268 dptr = &od->od_slicetab[0];
270 /* Check for a "dedicated" disk */
271 for (j = 0; j < od->od_nslices; j++) {
272 switch(dptr[j].dp_mid) {
274 sprintf(line, " disk%ds%d", i, j + 1);
276 dptr[j].dp_scyl * od->od_hds * od->od_sec +
277 dptr[j].dp_shd * od->od_sec + dptr[j].dp_ssect,
290 /* Given a size in 512 byte sectors, convert it to a human-readable number. */
292 display_size(uint64_t size)
299 if (size >= 10485760000LL) {
302 } else if (size >= 10240000) {
305 } else if (size >= 10000) {
309 sprintf(buf, "%.6ld%cB", (long)size, unit);
314 * Print out each valid partition in the disklabel of a FreeBSD slice.
315 * For size calculations, we assume a 512 byte sector size.
318 bd_printbsdslice(struct open_disk *od, daddr_t offset, char *prefix,
322 char buf[BIOSDISK_SECSIZE];
323 struct disklabel *lp;
327 if (bd_read(od, offset + LABELSECTOR, 1, buf))
329 lp =(struct disklabel *)(&buf[0]);
330 if (lp->d_magic != DISKMAGIC) {
331 sprintf(line, "%s: FFS bad disklabel\n", prefix);
336 /* Print partitions */
337 for (i = 0; i < lp->d_npartitions; i++) {
339 * For each partition, make sure we know what type of fs it is. If
340 * not, then skip it. However, since floppies often have bogus
341 * fstypes, print the 'a' partition on a floppy even if it is marked
344 if ((lp->d_partitions[i].p_fstype == FS_BSDFFS) ||
345 (lp->d_partitions[i].p_fstype == FS_SWAP) ||
346 (lp->d_partitions[i].p_fstype == FS_VINUM) ||
347 ((lp->d_partitions[i].p_fstype == FS_UNUSED) &&
348 (od->od_flags & BD_FLOPPY) && (i == 0))) {
350 /* Only print out statistics in verbose mode */
352 sprintf(line, " %s%c: %s %s (%d - %d)\n", prefix, 'a' + i,
353 (lp->d_partitions[i].p_fstype == FS_SWAP) ? "swap " :
354 (lp->d_partitions[i].p_fstype == FS_VINUM) ? "vinum" :
356 display_size(lp->d_partitions[i].p_size),
357 lp->d_partitions[i].p_offset,
358 lp->d_partitions[i].p_offset + lp->d_partitions[i].p_size);
360 sprintf(line, " %s%c: %s\n", prefix, 'a' + i,
361 (lp->d_partitions[i].p_fstype == FS_SWAP) ? "swap" :
362 (lp->d_partitions[i].p_fstype == FS_VINUM) ? "vinum" :
371 * Attempt to open the disk described by (dev) for use by (f).
373 * Note that the philosophy here is "give them exactly what
374 * they ask for". This is necessary because being too "smart"
375 * about what the user might want leads to complications.
376 * (eg. given no slice or partition value, with a disk that is
377 * sliced - are they after the first BSD slice, or the DOS
381 bd_open(struct open_file *f, ...)
384 struct i386_devdesc *dev;
385 struct open_disk *od;
389 dev = va_arg(ap, struct i386_devdesc *);
391 if ((error = bd_opendisk(&od, dev)))
397 ((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data = od;
398 DEBUG("open_disk %p, partition at 0x%x", od, od->od_boff);
403 bd_opendisk(struct open_disk **odp, struct i386_devdesc *dev)
405 struct open_disk *od;
408 if (dev->d_unit >= nbdinfo) {
409 DEBUG("attempt to open nonexistent disk");
413 od = (struct open_disk *)malloc(sizeof(struct open_disk));
419 /* Look up BIOS unit number, intialise open_disk structure */
420 od->od_dkunit = dev->d_unit;
421 od->od_unit = bdinfo[od->od_dkunit].bd_unit;
422 od->od_flags = bdinfo[od->od_dkunit].bd_flags;
425 DEBUG("open '%s', unit 0x%x slice %d partition %d",
426 i386_fmtdev(dev), dev->d_unit,
427 dev->d_kind.biosdisk.slice, dev->d_kind.biosdisk.partition);
429 /* Get geometry for this open (removable device may have changed) */
430 if (bd_getgeom(od)) {
431 DEBUG("can't get geometry");
436 /* Determine disk layout. */
437 error = bd_open_pc98(od, dev);
443 *odp = od; /* return the open disk */
449 bd_open_pc98(struct open_disk *od, struct i386_devdesc *dev)
451 struct pc98_partition *dptr;
452 struct disklabel *lp;
453 int sector, slice, i;
457 * Following calculations attempt to determine the correct value
458 * for d->od_boff by looking for the slice and partition specified,
459 * or searching for reasonable defaults.
463 * Find the slice in the DOS slice table.
466 if (od->od_flags & BD_FLOPPY) {
470 if (bd_read(od, 0, 1, buf)) {
471 DEBUG("error reading MBR");
476 * Check the slice table magic.
478 if (((u_char)buf[0x1fe] != 0x55) || ((u_char)buf[0x1ff] != 0xaa)) {
479 /* If a slice number was explicitly supplied, this is an error */
480 if (dev->d_kind.biosdisk.slice > 0) {
481 DEBUG("no slice table/MBR (no magic)");
485 goto unsliced; /* may be a floppy */
487 if (bd_read(od, 1, 1, buf)) {
488 DEBUG("error reading MBR");
493 * copy the partition table, then pick up any extended partitions.
495 bcopy(buf + DOSPARTOFF, &od->od_slicetab,
496 sizeof(struct pc98_partition) * NDOSPART);
497 od->od_nslices = NDOSPART; /* extended slices start here */
498 od->od_flags |= BD_PARTTABOK;
499 dptr = &od->od_slicetab[0];
501 /* Is this a request for the whole disk? */
502 if (dev->d_kind.biosdisk.slice == -1) {
508 * if a slice number was supplied but not found, this is an error.
510 if (dev->d_kind.biosdisk.slice > 0) {
511 slice = dev->d_kind.biosdisk.slice - 1;
512 if (slice >= od->od_nslices) {
513 DEBUG("slice %d not found", slice);
518 /* Try to auto-detect the best slice; this should always give a slice number */
519 if (dev->d_kind.biosdisk.slice == 0) {
520 slice = bd_bestslice(od);
524 dev->d_kind.biosdisk.slice = slice;
527 dptr = &od->od_slicetab[0];
529 * Accept the supplied slice number unequivocally (we may be looking
530 * at a DOS partition).
532 dptr += (dev->d_kind.biosdisk.slice - 1); /* we number 1-4, offsets are 0-3 */
533 sector = dptr->dp_scyl * od->od_hds * od->od_sec +
534 dptr->dp_shd * od->od_sec + dptr->dp_ssect;
536 int end = dptr->dp_ecyl * od->od_hds * od->od_sec +
537 dptr->dp_ehd * od->od_sec + dptr->dp_esect;
538 DEBUG("slice entry %d at %d, %d sectors",
539 dev->d_kind.biosdisk.slice - 1, sector, end-sector);
543 * If we are looking at a BSD slice, and the partition is < 0, assume the 'a' partition
545 if ((dptr->dp_mid == DOSMID_386BSD) && (dev->d_kind.biosdisk.partition < 0))
546 dev->d_kind.biosdisk.partition = 0;
550 * Now we have the slice offset, look for the partition in the disklabel if we have
551 * a partition to start with.
553 * XXX we might want to check the label checksum.
555 if (dev->d_kind.biosdisk.partition < 0) {
556 od->od_boff = sector; /* no partition, must be after the slice */
557 DEBUG("opening raw slice");
560 if (bd_read(od, sector + LABELSECTOR, 1, buf)) {
561 DEBUG("error reading disklabel");
564 DEBUG("copy %d bytes of label from %p to %p", sizeof(struct disklabel), buf + LABELOFFSET, &od->od_disklabel);
565 bcopy(buf + LABELOFFSET, &od->od_disklabel, sizeof(struct disklabel));
566 lp = &od->od_disklabel;
567 od->od_flags |= BD_LABELOK;
569 if (lp->d_magic != DISKMAGIC) {
570 DEBUG("no disklabel");
573 if (dev->d_kind.biosdisk.partition >= lp->d_npartitions) {
574 DEBUG("partition '%c' exceeds partitions in table (a-'%c')",
575 'a' + dev->d_kind.biosdisk.partition, 'a' + lp->d_npartitions);
580 /* Complain if the partition is unused unless this is a floppy. */
581 if ((lp->d_partitions[dev->d_kind.biosdisk.partition].p_fstype == FS_UNUSED) &&
582 !(od->od_flags & BD_FLOPPY))
583 DEBUG("warning, partition marked as unused");
587 lp->d_partitions[dev->d_kind.biosdisk.partition].p_offset -
588 lp->d_partitions[RAW_PART].p_offset +
595 * Search for a slice with the following preferences:
597 * 1: Active FreeBSD slice
598 * 2: Non-active FreeBSD slice
599 * 3: Active Linux slice
600 * 4: non-active Linux slice
601 * 5: Active FAT/FAT32 slice
602 * 6: non-active FAT/FAT32 slice
604 #define PREF_RAWDISK 0
605 #define PREF_FBSD_ACT 1
607 #define PREF_LINUX_ACT 3
609 #define PREF_DOS_ACT 5
614 * slicelimit is in the range 0 .. NDOSPART
617 bd_bestslice(struct open_disk *od)
619 struct pc98_partition *dp;
624 preflevel = PREF_NONE;
626 dp = &od->od_slicetab[0];
627 for (i = 0; i < od->od_nslices; i++, dp++) {
628 switch(dp->dp_mid & 0x7f) {
629 case DOSMID_386BSD & 0x7f: /* FreeBSD */
630 if ((dp->dp_mid & 0x80) &&
631 (preflevel > PREF_FBSD_ACT)) {
633 preflevel = PREF_FBSD_ACT;
634 } else if (preflevel > PREF_FBSD) {
636 preflevel = PREF_FBSD;
640 case 0x11: /* DOS/Windows */
646 if ((dp->dp_mid & 0x80) &&
647 (preflevel > PREF_DOS_ACT)) {
649 preflevel = PREF_DOS_ACT;
650 } else if (preflevel > PREF_DOS) {
652 preflevel = PREF_DOS;
661 bd_close(struct open_file *f)
663 struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data);
670 bd_closedisk(struct open_disk *od)
672 DEBUG("open_disk %p", od);
674 /* XXX is this required? (especially if disk already open...) */
675 if (od->od_flags & BD_FLOPPY)
682 bd_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
684 struct bcache_devdata bcd;
685 struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data);
687 bcd.dv_strategy = bd_realstrategy;
688 bcd.dv_devdata = devdata;
689 return(bcache_strategy(&bcd, od->od_unit, rw, dblk+od->od_boff, size, buf, rsize));
693 bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
695 struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data);
697 #ifdef BD_SUPPORT_FRAGS
698 char fragbuf[BIOSDISK_SECSIZE];
701 fragsize = size % BIOSDISK_SECSIZE;
703 if (size % BIOSDISK_SECSIZE)
704 panic("bd_strategy: %d bytes I/O not multiple of block size", size);
707 DEBUG("open_disk %p", od);
708 blks = size / BIOSDISK_SECSIZE;
714 DEBUG("read %d from %d to %p", blks, dblk, buf);
716 if (blks && bd_read(od, dblk, blks, buf)) {
720 #ifdef BD_SUPPORT_FRAGS
721 DEBUG("bd_strategy: frag read %d from %d+%d to %p",
722 fragsize, dblk, blks, buf + (blks * BIOSDISK_SECSIZE));
723 if (fragsize && bd_read(od, dblk + blks, 1, fragsize)) {
724 DEBUG("frag read error");
727 bcopy(fragbuf, buf + (blks * BIOSDISK_SECSIZE), fragsize);
731 DEBUG("write %d from %d to %p", blks, dblk, buf);
733 if (blks && bd_write(od, dblk, blks, buf)) {
734 DEBUG("write error");
737 #ifdef BD_SUPPORT_FRAGS
739 DEBUG("Attempted to write a frag");
754 /* Max number of sectors to bounce-buffer if the request crosses a 64k boundary */
755 #define FLOPPY_BOUNCEBUF 18
758 bd_chs_io(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest, int write)
760 u_int x, bpc, cyl, hd, sec;
762 bpc = (od->od_sec * od->od_hds); /* blocks per cylinder */
764 cyl = x / bpc; /* block # / blocks per cylinder */
765 x %= bpc; /* block offset into cylinder */
766 hd = x / od->od_sec; /* offset / blocks per track */
767 sec = x % od->od_sec; /* offset into track */
772 v86.eax = 0x0500 | od->od_unit;
774 v86.eax = 0x0600 | od->od_unit;
775 if (od->od_flags & BD_FLOPPY) {
777 v86.ecx = 0x0200 | (cyl & 0xff);
778 v86.edx = (hd << 8) | (sec + 1);
779 } else if (od->od_flags & BD_OPTICAL) {
781 v86.ecx = dblk & 0xFFFF;
782 v86.edx = dblk >> 16;
785 v86.edx = (hd << 8) | sec;
787 v86.ebx = blks * BIOSDISK_SECSIZE;
788 v86.es = VTOPSEG(dest);
789 v86.ebp = VTOPOFF(dest);
791 return (v86.efl & 0x1);
795 bd_io(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest, int write)
797 u_int x, sec, result, resid, retry, maxfer;
798 caddr_t p, xp, bbuf, breg;
800 /* Just in case some idiot actually tries to read/write -1 blocks... */
807 /* Decide whether we have to bounce */
808 if (VTOP(dest) >> 20 != 0 ||
809 ((VTOP(dest) >> 16) != (VTOP(dest + blks * BIOSDISK_SECSIZE) >> 16))) {
812 * There is a 64k physical boundary somewhere in the
813 * destination buffer, or the destination buffer is above
814 * first 1MB of physical memory so we have to arrange a
815 * suitable bounce buffer. Allocate a buffer twice as large
816 * as we need to. Use the bottom half unless there is a break
817 * there, in which case we use the top half.
819 x = min(od->od_sec, (unsigned)blks);
820 bbuf = alloca(x * 2 * BIOSDISK_SECSIZE);
821 if (((u_int32_t)VTOP(bbuf) & 0xffff0000) ==
822 ((u_int32_t)VTOP(bbuf + x * BIOSDISK_SECSIZE) & 0xffff0000)) {
825 breg = bbuf + x * BIOSDISK_SECSIZE;
827 maxfer = x; /* limit transfers to bounce region size */
835 * Play it safe and don't cross track boundaries.
836 * (XXX this is probably unnecessary)
838 sec = dblk % od->od_sec; /* offset into track */
839 x = min(od->od_sec - sec, resid);
841 x = min(x, maxfer); /* fit bounce buffer */
843 /* where do we transfer to? */
844 xp = bbuf == NULL ? p : breg;
847 * Put your Data In, Put your Data out,
848 * Put your Data In, and shake it all about
850 if (write && bbuf != NULL)
851 bcopy(p, breg, x * BIOSDISK_SECSIZE);
854 * Loop retrying the operation a couple of times. The BIOS
857 for (retry = 0; retry < 3; retry++) {
858 /* if retrying, reset the drive */
862 v86.eax = 0x0300 | od->od_unit;
866 result = bd_chs_io(od, dblk, x, xp, write);
872 DEBUG("%d sectors from %lld to %p (0x%x) %s", x, dblk, p, VTOP(p),
873 result ? "failed" : "ok");
875 DEBUG("%d sectors from %p (0x%x) to %lld %s", x, p, VTOP(p), dblk,
876 result ? "failed" : "ok");
880 if (!write && bbuf != NULL)
881 bcopy(breg, p, x * BIOSDISK_SECSIZE);
882 p += (x * BIOSDISK_SECSIZE);
887 /* hexdump(dest, (blks * BIOSDISK_SECSIZE)); */
892 bd_read(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest)
895 return (bd_io(od, dblk, blks, dest, 0));
899 bd_write(struct open_disk *od, daddr_t dblk, int blks, caddr_t dest)
902 return (bd_io(od, dblk, blks, dest, 1));
906 bd_getgeom(struct open_disk *od)
909 if (od->od_flags & BD_FLOPPY) {
912 od->od_sec = (od->od_unit & 0xf0) == 0x30 ? 18 : 15;
913 } else if (od->od_flags & BD_OPTICAL) {
920 v86.eax = 0x8400 | od->od_unit;
923 od->od_cyl = v86.ecx;
924 od->od_hds = (v86.edx >> 8) & 0xff;
925 od->od_sec = v86.edx & 0xff;
930 DEBUG("unit 0x%x geometry %d/%d/%d", od->od_unit, od->od_cyl, od->od_hds, od->od_sec);
935 * Return the BIOS geometry of a given "fixed drive" in a format
936 * suitable for the legacy bootinfo structure. Since the kernel is
937 * expecting raw int 0x13/0x8 values for N_BIOS_GEOM drives, we
938 * prefer to get the information directly, rather than rely on being
939 * able to put it together from information already maintained for
940 * different purposes and for a probably different number of drives.
942 * For valid drives, the geometry is expected in the format (31..0)
943 * "000000cc cccccccc hhhhhhhh 00ssssss"; and invalid drives are
944 * indicated by returning the geometry of a "1.2M" PC-format floppy
945 * disk. And, incidentally, what is returned is not the geometry as
946 * such but the highest valid cylinder, head, and sector numbers.
949 bd_getbigeom(int bunit)
952 int unit = 0x80; /* IDE HDD */
953 u_int addr = 0xA155d;
955 while (unit < 0xa7) {
956 if (*(u_char *)PTOV(addr) & (1 << (unit & 0x0f)))
961 int media = ((unsigned *)PTOV(0xA1460))[unit & 0x0F] & 0x1F;
963 if (media == 7 && hds++ == bunit) /* SCSI MO */
964 return(0xFFFE0820); /* C:65535 H:8 S:32 */
966 if (++unit == 0x84) {
967 unit = 0xA0; /* SCSI HDD */
972 return 0x4F020F; /* 1200KB FD C:80 H:2 S:15 */
975 v86.eax = 0x8400 | unit;
978 return 0x4F020F; /* 1200KB FD C:80 H:2 S:15 */
979 return ((v86.ecx & 0xffff) << 16) | (v86.edx & 0xffff);
983 * Return a suitable dev_t value for (dev).
985 * In the case where it looks like (dev) is a SCSI disk, we allow the number of
986 * IDE disks to be specified in $num_ide_disks. There should be a Better Way.
989 bd_getdev(struct i386_devdesc *dev)
991 struct open_disk *od;
996 int unitofs = 0, i, unit;
998 biosdev = bd_unit2bios(dev->d_unit);
999 DEBUG("unit %d BIOS device %d", dev->d_unit, biosdev);
1000 if (biosdev == -1) /* not a BIOS device */
1002 if (bd_opendisk(&od, dev) != 0) /* oops, not a viable device */
1005 if ((biosdev & 0xf0) == 0x90 || (biosdev & 0xf0) == 0x30) {
1006 /* floppy (or emulated floppy) or ATAPI device */
1007 if (bdinfo[dev->d_unit].bd_type == DT_ATAPI) {
1008 /* is an ATAPI disk */
1011 /* is a floppy disk */
1016 if ((od->od_flags & BD_LABELOK) && (od->od_disklabel.d_type == DTYPE_SCSI)) {
1017 /* label OK, disk labelled as SCSI */
1019 /* check for unit number correction hint, now deprecated */
1020 if ((nip = getenv("num_ide_disks")) != NULL) {
1021 i = strtol(nip, &cp, 0);
1022 /* check for parse error */
1023 if ((cp != nip) && (*cp == 0))
1027 /* assume an IDE disk */
1031 /* default root disk unit number */
1032 if ((biosdev & 0xf0) == 0xa0)
1033 unit = bdinfo[dev->d_unit].bd_da_unit;
1035 unit = biosdev & 0xf;
1037 /* XXX a better kludge to set the root disk unit number */
1038 if ((nip = getenv("root_disk_unit")) != NULL) {
1039 i = strtol(nip, &cp, 0);
1040 /* check for parse error */
1041 if ((cp != nip) && (*cp == 0))
1045 rootdev = MAKEBOOTDEV(major, dev->d_kind.biosdisk.slice + 1, unit,
1046 dev->d_kind.biosdisk.partition);
1047 DEBUG("dev is 0x%x\n", rootdev);