2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * Copyright (c) 2012 Andrey V. Elsukov <ae@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
32 * BIOS disk device handling.
34 * Ideas and algorithms from:
36 * - NetBSD libi386/biosdisk.c
37 * - FreeBSD biosboot/disk.c
42 #include <sys/limits.h>
44 #include <machine/bootinfo.h>
47 #include <bootstrap.h>
53 #ifdef LOADER_GELI_SUPPORT
60 struct ptable_entry part;
68 STAILQ_ENTRY(pentry) entry;
71 enum ptable_type type;
75 STAILQ_HEAD(, pentry) entries;
79 #endif /* LOADER_GELI_SUPPORT */
81 #define BIOS_NUMDRIVES 0x475
82 #define BIOSDISK_SECSIZE 512
83 #define BUFSIZE (1 * BIOSDISK_SECSIZE)
85 #define DT_ATAPI 0x10 /* disk type for ATAPI floppies */
86 #define WDMAJOR 0 /* major numbers for devices we frontend for */
92 # define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args)
94 # define DEBUG(fmt, args...)
98 * List of BIOS devices, translation from disk unit number to
103 int bd_unit; /* BIOS unit number */
104 int bd_cyl; /* BIOS geometry */
108 #define BD_MODEINT13 0x0000
109 #define BD_MODEEDD1 0x0001
110 #define BD_MODEEDD3 0x0002
111 #define BD_MODEMASK 0x0003
112 #define BD_FLOPPY 0x0004
113 int bd_type; /* BIOS 'drive type' (floppy only) */
114 uint16_t bd_sectorsize; /* Sector size */
115 uint64_t bd_sectors; /* Disk size */
116 int bd_open; /* reference counter */
117 void *bd_bcache; /* buffer cache data */
119 static int nbdinfo = 0;
121 #define BD(dev) (bdinfo[(dev)->dd.d_unit])
123 static void bd_io_workaround(struct disk_devdesc *dev);
125 static int bd_read(struct disk_devdesc *dev, daddr_t dblk, int blks,
127 static int bd_write(struct disk_devdesc *dev, daddr_t dblk, int blks,
129 static int bd_int13probe(struct bdinfo *bd);
131 static int bd_init(void);
132 static int bd_strategy(void *devdata, int flag, daddr_t dblk, size_t size,
133 char *buf, size_t *rsize);
134 static int bd_realstrategy(void *devdata, int flag, daddr_t dblk, size_t size,
135 char *buf, size_t *rsize);
136 static int bd_open(struct open_file *f, ...);
137 static int bd_close(struct open_file *f);
138 static int bd_ioctl(struct open_file *f, u_long cmd, void *data);
139 static int bd_print(int verbose);
141 #ifdef LOADER_GELI_SUPPORT
147 static enum isgeli geli_status[MAXBDDEV][MAXTBLENTS];
149 int bios_read(void *, void *, off_t off, void *buf, size_t bytes);
150 #endif /* LOADER_GELI_SUPPORT */
152 struct devsw biosdisk = {
165 * Translate between BIOS device numbers and our private unit numbers.
168 bd_bios2unit(int biosdev)
172 DEBUG("looking for bios device 0x%x", biosdev);
173 for (i = 0; i < nbdinfo; i++) {
174 DEBUG("bd unit %d is BIOS device 0x%x", i, bdinfo[i].bd_unit);
175 if (bdinfo[i].bd_unit == biosdev)
182 bd_unit2bios(int unit)
185 if ((unit >= 0) && (unit < nbdinfo))
186 return (bdinfo[unit].bd_unit);
191 * Quiz the BIOS for disk devices, save a little info about them.
196 int base, unit, nfd = 0;
198 #ifdef LOADER_GELI_SUPPORT
201 /* sequence 0, 0x80 */
202 for (base = 0; base <= 0x80; base += 0x80) {
203 for (unit = base; (nbdinfo < MAXBDDEV); unit++) {
206 * Check the BIOS equipment list for number
210 (nfd >= *(unsigned char *)PTOV(BIOS_NUMDRIVES)))
213 bdinfo[nbdinfo].bd_open = 0;
214 bdinfo[nbdinfo].bd_bcache = NULL;
215 bdinfo[nbdinfo].bd_unit = unit;
216 bdinfo[nbdinfo].bd_flags = unit < 0x80 ? BD_FLOPPY: 0;
217 if (!bd_int13probe(&bdinfo[nbdinfo]))
220 /* XXX we need "disk aliases" to make this simpler */
221 printf("BIOS drive %c: is disk%d\n", (unit < 0x80) ?
222 ('A' + unit): ('C' + unit - 0x80), nbdinfo);
228 bcache_add_dev(nbdinfo);
233 * Try to detect a device supported by the legacy int13 BIOS
236 bd_int13probe(struct bdinfo *bd)
238 struct edd_params params;
239 int ret = 1; /* assume success */
244 v86.edx = bd->bd_unit;
247 /* Don't error out if we get bad sector number, try EDD as well */
248 if (V86_CY(v86.efl) || /* carry set */
249 (v86.edx & 0xff) <= (unsigned)(bd->bd_unit & 0x7f)) /* unit # bad */
250 return (0); /* skip device */
252 if ((v86.ecx & 0x3f) == 0) /* absurd sector number */
253 ret = 0; /* set error */
255 /* Convert max cyl # -> # of cylinders */
256 bd->bd_cyl = ((v86.ecx & 0xc0) << 2) + ((v86.ecx & 0xff00) >> 8) + 1;
257 /* Convert max head # -> # of heads */
258 bd->bd_hds = ((v86.edx & 0xff00) >> 8) + 1;
259 bd->bd_sec = v86.ecx & 0x3f;
260 bd->bd_type = v86.ebx & 0xff;
261 bd->bd_flags |= BD_MODEINT13;
263 /* Calculate sectors count from the geometry */
264 bd->bd_sectors = bd->bd_cyl * bd->bd_hds * bd->bd_sec;
265 bd->bd_sectorsize = BIOSDISK_SECSIZE;
266 DEBUG("unit 0x%x geometry %d/%d/%d", bd->bd_unit, bd->bd_cyl,
267 bd->bd_hds, bd->bd_sec);
269 /* Determine if we can use EDD with this device. */
273 v86.edx = bd->bd_unit;
276 if (V86_CY(v86.efl) || /* carry set */
277 (v86.ebx & 0xffff) != 0xaa55 || /* signature */
278 (v86.ecx & EDD_INTERFACE_FIXED_DISK) == 0)
279 return (ret); /* return code from int13 AH=08 */
282 bd->bd_flags |= BD_MODEEDD1;
283 if ((v86.eax & 0xff00) >= 0x3000)
284 bd->bd_flags |= BD_MODEEDD3;
285 /* Get disk params */
286 params.len = sizeof(struct edd_params);
290 v86.edx = bd->bd_unit;
291 v86.ds = VTOPSEG(¶ms);
292 v86.esi = VTOPOFF(¶ms);
294 if (!V86_CY(v86.efl)) {
298 * Sector size must be a multiple of 512 bytes.
299 * An alternate test would be to check power of 2,
300 * powerof2(params.sector_size).
302 if (params.sector_size % BIOSDISK_SECSIZE)
303 bd->bd_sectorsize = BIOSDISK_SECSIZE;
305 bd->bd_sectorsize = params.sector_size;
307 total = bd->bd_sectorsize * params.sectors;
308 if (params.sectors != 0) {
309 /* Only update if we did not overflow. */
310 if (total > params.sectors)
311 bd->bd_sectors = params.sectors;
314 total = (uint64_t)params.cylinders *
315 params.heads * params.sectors_per_track;
316 if (bd->bd_sectors < total)
317 bd->bd_sectors = total;
321 DEBUG("unit 0x%x flags %x, sectors %llu, sectorsize %u",
322 bd->bd_unit, bd->bd_flags, bd->bd_sectors, bd->bd_sectorsize);
327 * Print information about disks
330 bd_print(int verbose)
332 static char line[80];
333 struct disk_devdesc dev;
339 printf("%s devices:", biosdisk.dv_name);
340 if ((ret = pager_output("\n")) != 0)
343 for (i = 0; i < nbdinfo; i++) {
344 snprintf(line, sizeof(line),
345 " disk%d: BIOS drive %c (%ju X %u):\n", i,
346 (bdinfo[i].bd_unit < 0x80) ? ('A' + bdinfo[i].bd_unit):
347 ('C' + bdinfo[i].bd_unit - 0x80),
348 (uintmax_t)bdinfo[i].bd_sectors,
349 bdinfo[i].bd_sectorsize);
350 if ((ret = pager_output(line)) != 0)
352 dev.dd.d_dev = &biosdisk;
355 dev.d_partition = -1;
357 bdinfo[i].bd_sectorsize * bdinfo[i].bd_sectors,
358 bdinfo[i].bd_sectorsize) == 0) {
359 snprintf(line, sizeof(line), " disk%d", i);
360 ret = disk_print(&dev, line, verbose);
370 * Attempt to open the disk described by (dev) for use by (f).
372 * Note that the philosophy here is "give them exactly what
373 * they ask for". This is necessary because being too "smart"
374 * about what the user might want leads to complications.
375 * (eg. given no slice or partition value, with a disk that is
376 * sliced - are they after the first BSD slice, or the DOS
380 bd_open(struct open_file *f, ...)
382 struct disk_devdesc *dev, rdev;
383 struct disk_devdesc disk;
389 dev = va_arg(ap, struct disk_devdesc *);
392 if (dev->dd.d_unit < 0 || dev->dd.d_unit >= nbdinfo)
395 if (BD(dev).bd_bcache == NULL)
396 BD(dev).bd_bcache = bcache_allocate();
399 * Read disk size from partition.
400 * This is needed to work around buggy BIOS systems returning
401 * wrong (truncated) disk media size.
402 * During bd_probe() we tested if the mulitplication of bd_sectors
403 * would overflow so it should be safe to perform here.
405 disk.dd.d_dev = dev->dd.d_dev;
406 disk.dd.d_unit = dev->dd.d_unit;
408 disk.d_partition = -1;
410 if (disk_open(&disk, BD(dev).bd_sectors * BD(dev).bd_sectorsize,
411 BD(dev).bd_sectorsize) == 0) {
413 if (disk_ioctl(&disk, DIOCGMEDIASIZE, &size) == 0) {
414 size /= BD(dev).bd_sectorsize;
415 if (size > BD(dev).bd_sectors)
416 BD(dev).bd_sectors = size;
421 err = disk_open(dev, BD(dev).bd_sectors * BD(dev).bd_sectorsize,
422 BD(dev).bd_sectorsize);
424 #ifdef LOADER_GELI_SUPPORT
425 static char gelipw[GELI_PW_MAXLEN];
431 /* if we already know there is no GELI, skip the rest */
432 if (geli_status[dev->dd.d_unit][dev->d_slice] != ISGELI_UNKNOWN)
436 struct ptable *table = NULL;
437 struct ptable_entry part;
438 struct pentry *entry;
441 dskp.drive = bd_unit2bios(dev->dd.d_unit);
442 dskp.type = dev->dd.d_dev->dv_type;
443 dskp.unit = dev->dd.d_unit;
444 dskp.slice = dev->d_slice;
445 dskp.part = dev->d_partition;
446 dskp.start = dev->d_offset;
448 memcpy(&rdev, dev, sizeof(rdev));
449 /* to read the GPT table, we need to read the first sector */
451 /* We need the LBA of the end of the partition */
452 table = ptable_open(&rdev, BD(dev).bd_sectors,
453 BD(dev).bd_sectorsize, ptblread);
455 DEBUG("Can't read partition table");
456 /* soft failure, return the exit status of disk_open */
460 if (table->type == PTABLE_GPT)
463 STAILQ_FOREACH(entry, &table->entries, entry) {
464 dskp.slice = entry->part.index;
465 dskp.start = entry->part.start;
466 if (is_geli(&dskp) == 0) {
467 geli_status[dev->dd.d_unit][dskp.slice] = ISGELI_YES;
470 if (geli_taste(bios_read, &dskp,
471 entry->part.end - entry->part.start) == 0) {
472 if (geli_havekey(&dskp) == 0) {
473 geli_status[dev->dd.d_unit][dskp.slice] = ISGELI_YES;
477 if ((passphrase = getenv("kern.geom.eli.passphrase"))
479 /* Use the cached passphrase */
480 bcopy(passphrase, &gelipw, GELI_PW_MAXLEN);
482 if (geli_passphrase(gelipw, dskp.unit, 'p',
483 (dskp.slice > 0 ? dskp.slice : dskp.part),
485 setenv("kern.geom.eli.passphrase", gelipw, 1);
486 bzero(gelipw, sizeof(gelipw));
487 geli_status[dev->dd.d_unit][dskp.slice] = ISGELI_YES;
492 geli_status[dev->dd.d_unit][dskp.slice] = ISGELI_NO;
495 /* none of the partitions on this disk have GELI */
496 if (geli_part == 0) {
498 geli_status[dev->dd.d_unit][dev->d_slice] = ISGELI_NO;
500 #endif /* LOADER_GELI_SUPPORT */
506 bd_close(struct open_file *f)
508 struct disk_devdesc *dev;
510 dev = (struct disk_devdesc *)f->f_devdata;
512 if (BD(dev).bd_open == 0) {
513 bcache_free(BD(dev).bd_bcache);
514 BD(dev).bd_bcache = NULL;
516 return (disk_close(dev));
520 bd_ioctl(struct open_file *f, u_long cmd, void *data)
522 struct disk_devdesc *dev;
525 dev = (struct disk_devdesc *)f->f_devdata;
527 rc = disk_ioctl(dev, cmd, data);
532 case DIOCGSECTORSIZE:
533 *(u_int *)data = BD(dev).bd_sectorsize;
536 *(uint64_t *)data = BD(dev).bd_sectors * BD(dev).bd_sectorsize;
545 bd_strategy(void *devdata, int rw, daddr_t dblk, size_t size,
546 char *buf, size_t *rsize)
548 struct bcache_devdata bcd;
549 struct disk_devdesc *dev;
551 dev = (struct disk_devdesc *)devdata;
552 bcd.dv_strategy = bd_realstrategy;
553 bcd.dv_devdata = devdata;
554 bcd.dv_cache = BD(dev).bd_bcache;
555 return (bcache_strategy(&bcd, rw, dblk + dev->d_offset,
560 bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size,
561 char *buf, size_t *rsize)
563 struct disk_devdesc *dev = (struct disk_devdesc *)devdata;
564 uint64_t disk_blocks;
566 #ifdef BD_SUPPORT_FRAGS /* XXX: sector size */
567 char fragbuf[BIOSDISK_SECSIZE];
570 fragsize = size % BIOSDISK_SECSIZE;
572 if (size % BD(dev).bd_sectorsize)
573 panic("bd_strategy: %d bytes I/O not multiple of block size", size);
576 DEBUG("open_disk %p", dev);
579 * Check the value of the size argument. We do have quite small
580 * heap (64MB), but we do not know good upper limit, so we check against
581 * INT_MAX here. This will also protect us against possible overflows
582 * while translating block count to bytes.
584 if (size > INT_MAX) {
585 DEBUG("too large read: %zu bytes", size);
589 blks = size / BD(dev).bd_sectorsize;
590 if (dblk > dblk + blks)
596 /* Get disk blocks, this value is either for whole disk or for partition */
597 if (disk_ioctl(dev, DIOCGMEDIASIZE, &disk_blocks)) {
598 /* DIOCGMEDIASIZE does return bytes. */
599 disk_blocks /= BD(dev).bd_sectorsize;
601 /* We should not get here. Just try to survive. */
602 disk_blocks = BD(dev).bd_sectors - dev->d_offset;
605 /* Validate source block address. */
606 if (dblk < dev->d_offset || dblk >= dev->d_offset + disk_blocks)
610 * Truncate if we are crossing disk or partition end.
612 if (dblk + blks >= dev->d_offset + disk_blocks) {
613 blks = dev->d_offset + disk_blocks - dblk;
614 size = blks * BD(dev).bd_sectorsize;
615 DEBUG("short read %d", blks);
618 switch (rw & F_MASK) {
620 DEBUG("read %d from %lld to %p", blks, dblk, buf);
622 if (blks && (rc = bd_read(dev, dblk, blks, buf))) {
623 /* Filter out floppy controller errors */
624 if (BD(dev).bd_flags != BD_FLOPPY || rc != 0x20) {
625 printf("read %d from %lld to %p, error: 0x%x", blks, dblk,
630 #ifdef BD_SUPPORT_FRAGS /* XXX: sector size */
631 DEBUG("bd_strategy: frag read %d from %d+%d to %p",
632 fragsize, dblk, blks, buf + (blks * BIOSDISK_SECSIZE));
633 if (fragsize && bd_read(od, dblk + blks, 1, fragsize)) {
634 DEBUG("frag read error");
637 bcopy(fragbuf, buf + (blks * BIOSDISK_SECSIZE), fragsize);
641 DEBUG("write %d from %d to %p", blks, dblk, buf);
643 if (blks && bd_write(dev, dblk, blks, buf)) {
644 DEBUG("write error");
647 #ifdef BD_SUPPORT_FRAGS
649 DEBUG("Attempted to write a frag");
665 bd_edd_io(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest,
668 static struct edd_packet packet;
670 packet.len = sizeof(struct edd_packet);
672 packet.off = VTOPOFF(dest);
673 packet.seg = VTOPSEG(dest);
678 /* Should we Write with verify ?? 0x4302 ? */
682 v86.edx = BD(dev).bd_unit;
683 v86.ds = VTOPSEG(&packet);
684 v86.esi = VTOPOFF(&packet);
687 return (v86.eax >> 8);
692 bd_chs_io(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest,
695 u_int x, bpc, cyl, hd, sec;
697 bpc = BD(dev).bd_sec * BD(dev).bd_hds; /* blocks per cylinder */
699 cyl = x / bpc; /* block # / blocks per cylinder */
700 x %= bpc; /* block offset into cylinder */
701 hd = x / BD(dev).bd_sec; /* offset / blocks per track */
702 sec = x % BD(dev).bd_sec; /* offset into track */
704 /* correct sector number for 1-based BIOS numbering */
708 /* CHS doesn't support cylinders > 1023. */
714 v86.eax = 0x300 | blks;
716 v86.eax = 0x200 | blks;
717 v86.ecx = ((cyl & 0xff) << 8) | ((cyl & 0x300) >> 2) | sec;
718 v86.edx = (hd << 8) | BD(dev).bd_unit;
719 v86.es = VTOPSEG(dest);
720 v86.ebx = VTOPOFF(dest);
723 return (v86.eax >> 8);
728 bd_io_workaround(struct disk_devdesc *dev)
730 uint8_t buf[8 * 1024];
732 bd_edd_io(dev, 0xffffffff, 1, (caddr_t)buf, 0);
737 bd_io(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest, int write)
739 u_int x, sec, result, resid, retry, maxfer;
742 /* Just in case some idiot actually tries to read/write -1 blocks... */
750 * Workaround for a problem with some HP ProLiant BIOS failing to work out
751 * the boot disk after installation. hrs and kuriyama discovered this
752 * problem with an HP ProLiant DL320e Gen 8 with a 3TB HDD, and discovered
753 * that an int13h call seems to cause a buffer overrun in the bios. The
754 * problem is alleviated by doing an extra read before the buggy read. It
755 * is not immediately known whether other models are similarly affected.
757 if (dblk >= 0x100000000)
758 bd_io_workaround(dev);
760 /* Decide whether we have to bounce */
761 if (VTOP(dest) >> 20 != 0 || (BD(dev).bd_unit < 0x80 &&
762 (VTOP(dest) >> 16) != (VTOP(dest +
763 blks * BD(dev).bd_sectorsize) >> 16))) {
766 * There is a 64k physical boundary somewhere in the
767 * destination buffer, or the destination buffer is above
768 * first 1MB of physical memory so we have to arrange a
769 * suitable bounce buffer. Allocate a buffer twice as large
770 * as we need to. Use the bottom half unless there is a break
771 * there, in which case we use the top half.
773 x = V86_IO_BUFFER_SIZE / BD(dev).bd_sectorsize;
774 x = min(x, (unsigned)blks);
775 bbuf = PTOV(V86_IO_BUFFER);
776 maxfer = x; /* limit transfers to bounce region size */
784 * Play it safe and don't cross track boundaries.
785 * (XXX this is probably unnecessary)
787 sec = dblk % BD(dev).bd_sec; /* offset into track */
788 x = min(BD(dev).bd_sec - sec, resid);
790 x = min(x, maxfer); /* fit bounce buffer */
792 /* where do we transfer to? */
793 xp = bbuf == NULL ? p : bbuf;
796 * Put your Data In, Put your Data out,
797 * Put your Data In, and shake it all about
799 if (write && bbuf != NULL)
800 bcopy(p, bbuf, x * BD(dev).bd_sectorsize);
803 * Loop retrying the operation a couple of times. The BIOS
806 for (retry = 0; retry < 3; retry++) {
807 /* if retrying, reset the drive */
812 v86.edx = BD(dev).bd_unit;
816 if (BD(dev).bd_flags & BD_MODEEDD1)
817 result = bd_edd_io(dev, dblk, x, xp, write);
819 result = bd_chs_io(dev, dblk, x, xp, write);
825 DEBUG("Write %d sector(s) from %p (0x%x) to %lld %s", x,
826 p, VTOP(p), dblk, result ? "failed" : "ok");
828 DEBUG("Read %d sector(s) from %lld to %p (0x%x) %s", x,
829 dblk, p, VTOP(p), result ? "failed" : "ok");
833 if (!write && bbuf != NULL)
834 bcopy(bbuf, p, x * BD(dev).bd_sectorsize);
835 p += (x * BD(dev).bd_sectorsize);
840 /* hexdump(dest, (blks * BD(dev).bd_sectorsize)); */
845 bd_read(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest)
847 #ifdef LOADER_GELI_SUPPORT
851 int err, n, alignblks;
854 /* if we already know there is no GELI, skip the rest */
855 if (geli_status[dev->dd.d_unit][dev->d_slice] != ISGELI_YES)
856 return (bd_io(dev, dblk, blks, dest, 0));
858 if (geli_status[dev->dd.d_unit][dev->d_slice] == ISGELI_YES) {
860 * Align reads to DEV_GELIBOOT_BSIZE bytes because partial
861 * sectors cannot be decrypted. Round the requested LBA down to
862 * nearest multiple of DEV_GELIBOOT_BSIZE bytes.
864 alignlba = rounddown2(dblk * BD(dev).bd_sectorsize,
865 DEV_GELIBOOT_BSIZE) / BD(dev).bd_sectorsize;
867 * Round number of blocks to read up to nearest multiple of
870 diff = (dblk - alignlba) * BD(dev).bd_sectorsize;
871 alignblks = roundup2(blks * BD(dev).bd_sectorsize + diff,
872 DEV_GELIBOOT_BSIZE) / BD(dev).bd_sectorsize;
875 * If the read is rounded up to a larger size, use a temporary
876 * buffer here because the buffer provided by the caller may be
882 tmpbuf = malloc(alignblks * BD(dev).bd_sectorsize);
883 if (tmpbuf == NULL) {
888 err = bd_io(dev, alignlba, alignblks, tmpbuf, 0);
892 dskp.drive = bd_unit2bios(dev->dd.d_unit);
893 dskp.type = dev->dd.d_dev->dv_type;
894 dskp.unit = dev->dd.d_unit;
895 dskp.slice = dev->d_slice;
896 dskp.part = dev->d_partition;
897 dskp.start = dev->d_offset;
899 /* GELI needs the offset relative to the partition start */
900 p_off = alignlba - dskp.start;
902 err = geli_read(&dskp, p_off * BD(dev).bd_sectorsize, (u_char *)tmpbuf,
903 alignblks * BD(dev).bd_sectorsize);
907 if (tmpbuf != dest) {
908 bcopy(tmpbuf + diff, dest, blks * BD(dev).bd_sectorsize);
913 #endif /* LOADER_GELI_SUPPORT */
915 return (bd_io(dev, dblk, blks, dest, 0));
919 bd_write(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest)
922 return (bd_io(dev, dblk, blks, dest, 1));
926 * Return the BIOS geometry of a given "fixed drive" in a format
927 * suitable for the legacy bootinfo structure. Since the kernel is
928 * expecting raw int 0x13/0x8 values for N_BIOS_GEOM drives, we
929 * prefer to get the information directly, rather than rely on being
930 * able to put it together from information already maintained for
931 * different purposes and for a probably different number of drives.
933 * For valid drives, the geometry is expected in the format (31..0)
934 * "000000cc cccccccc hhhhhhhh 00ssssss"; and invalid drives are
935 * indicated by returning the geometry of a "1.2M" PC-format floppy
936 * disk. And, incidentally, what is returned is not the geometry as
937 * such but the highest valid cylinder, head, and sector numbers.
940 bd_getbigeom(int bunit)
946 v86.edx = 0x80 + bunit;
950 return ((v86.ecx & 0xc0) << 18) | ((v86.ecx & 0xff00) << 8) |
951 (v86.edx & 0xff00) | (v86.ecx & 0x3f);
955 * Return a suitable dev_t value for (dev).
957 * In the case where it looks like (dev) is a SCSI disk, we allow the number of
958 * IDE disks to be specified in $num_ide_disks. There should be a Better Way.
961 bd_getdev(struct i386_devdesc *d)
963 struct disk_devdesc *dev;
970 dev = (struct disk_devdesc *)d;
971 biosdev = bd_unit2bios(dev->dd.d_unit);
972 DEBUG("unit %d BIOS device %d", dev->dd.d_unit, biosdev);
973 if (biosdev == -1) /* not a BIOS device */
975 if (disk_open(dev, BD(dev).bd_sectors * BD(dev).bd_sectorsize,
976 BD(dev).bd_sectorsize) != 0) /* oops, not a viable device */
981 if (biosdev < 0x80) {
982 /* floppy (or emulated floppy) or ATAPI device */
983 if (bdinfo[dev->dd.d_unit].bd_type == DT_ATAPI) {
984 /* is an ATAPI disk */
987 /* is a floppy disk */
991 /* assume an IDE disk */
994 /* default root disk unit number */
995 unit = biosdev & 0x7f;
997 /* XXX a better kludge to set the root disk unit number */
998 if ((nip = getenv("root_disk_unit")) != NULL) {
999 i = strtol(nip, &cp, 0);
1000 /* check for parse error */
1001 if ((cp != nip) && (*cp == 0))
1005 rootdev = MAKEBOOTDEV(major, dev->d_slice + 1, unit, dev->d_partition);
1006 DEBUG("dev is 0x%x\n", rootdev);
1010 #ifdef LOADER_GELI_SUPPORT
1012 bios_read(void *vdev __unused, void *xpriv, off_t off, void *buf, size_t bytes)
1014 struct disk_devdesc dev;
1015 struct dsk *priv = xpriv;
1017 dev.dd.d_dev = &biosdisk;
1018 dev.dd.d_unit = priv->unit;
1019 dev.d_slice = priv->slice;
1020 dev.d_partition = priv->part;
1021 dev.d_offset = priv->start;
1023 off = off / BD(&dev).bd_sectorsize;
1024 /* GELI gives us the offset relative to the partition start */
1025 off += dev.d_offset;
1026 bytes = bytes / BD(&dev).bd_sectorsize;
1028 return (bd_io(&dev, off, bytes, buf, 0));
1030 #endif /* LOADER_GELI_SUPPORT */