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 CTASSERT(sizeof(struct i386_devdesc) >= sizeof(struct disk_devdesc));
83 #define BIOS_NUMDRIVES 0x475
84 #define BIOSDISK_SECSIZE 512
85 #define BUFSIZE (1 * BIOSDISK_SECSIZE)
87 #define DT_ATAPI 0x10 /* disk type for ATAPI floppies */
88 #define WDMAJOR 0 /* major numbers for devices we frontend for */
94 # define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args)
96 # define DEBUG(fmt, args...)
100 * List of BIOS devices, translation from disk unit number to
105 int bd_unit; /* BIOS unit number */
106 int bd_cyl; /* BIOS geometry */
110 #define BD_MODEINT13 0x0000
111 #define BD_MODEEDD1 0x0001
112 #define BD_MODEEDD3 0x0002
113 #define BD_MODEMASK 0x0003
114 #define BD_FLOPPY 0x0004
115 int bd_type; /* BIOS 'drive type' (floppy only) */
116 uint16_t bd_sectorsize; /* Sector size */
117 uint64_t bd_sectors; /* Disk size */
118 int bd_open; /* reference counter */
119 void *bd_bcache; /* buffer cache data */
121 static int nbdinfo = 0;
123 #define BD(dev) (bdinfo[(dev)->dd.d_unit])
125 static void bd_io_workaround(struct disk_devdesc *dev);
127 static int bd_read(struct disk_devdesc *dev, daddr_t dblk, int blks,
129 static int bd_write(struct disk_devdesc *dev, daddr_t dblk, int blks,
131 static int bd_int13probe(struct bdinfo *bd);
133 static int bd_init(void);
134 static int bd_strategy(void *devdata, int flag, daddr_t dblk, size_t size,
135 char *buf, size_t *rsize);
136 static int bd_realstrategy(void *devdata, int flag, daddr_t dblk, size_t size,
137 char *buf, size_t *rsize);
138 static int bd_open(struct open_file *f, ...);
139 static int bd_close(struct open_file *f);
140 static int bd_ioctl(struct open_file *f, u_long cmd, void *data);
141 static int bd_print(int verbose);
143 #ifdef LOADER_GELI_SUPPORT
149 static enum isgeli geli_status[MAXBDDEV][MAXTBLENTS];
151 int bios_read(void *, void *, off_t off, void *buf, size_t bytes);
152 #endif /* LOADER_GELI_SUPPORT */
154 struct devsw biosdisk = {
167 * Translate between BIOS device numbers and our private unit numbers.
170 bd_bios2unit(int biosdev)
174 DEBUG("looking for bios device 0x%x", biosdev);
175 for (i = 0; i < nbdinfo; i++) {
176 DEBUG("bd unit %d is BIOS device 0x%x", i, bdinfo[i].bd_unit);
177 if (bdinfo[i].bd_unit == biosdev)
184 bd_unit2bios(int unit)
187 if ((unit >= 0) && (unit < nbdinfo))
188 return (bdinfo[unit].bd_unit);
193 * Quiz the BIOS for disk devices, save a little info about them.
198 int base, unit, nfd = 0;
200 #ifdef LOADER_GELI_SUPPORT
203 /* sequence 0, 0x80 */
204 for (base = 0; base <= 0x80; base += 0x80) {
205 for (unit = base; (nbdinfo < MAXBDDEV); unit++) {
208 * Check the BIOS equipment list for number
212 (nfd >= *(unsigned char *)PTOV(BIOS_NUMDRIVES)))
215 bdinfo[nbdinfo].bd_open = 0;
216 bdinfo[nbdinfo].bd_bcache = NULL;
217 bdinfo[nbdinfo].bd_unit = unit;
218 bdinfo[nbdinfo].bd_flags = unit < 0x80 ? BD_FLOPPY: 0;
219 if (!bd_int13probe(&bdinfo[nbdinfo]))
222 /* XXX we need "disk aliases" to make this simpler */
223 printf("BIOS drive %c: is disk%d\n", (unit < 0x80) ?
224 ('A' + unit): ('C' + unit - 0x80), nbdinfo);
230 bcache_add_dev(nbdinfo);
235 * Try to detect a device supported by the legacy int13 BIOS
238 bd_int13probe(struct bdinfo *bd)
240 struct edd_params params;
241 int ret = 1; /* assume success */
246 v86.edx = bd->bd_unit;
249 /* Don't error out if we get bad sector number, try EDD as well */
250 if (V86_CY(v86.efl) || /* carry set */
251 (v86.edx & 0xff) <= (unsigned)(bd->bd_unit & 0x7f)) /* unit # bad */
252 return (0); /* skip device */
254 if ((v86.ecx & 0x3f) == 0) /* absurd sector number */
255 ret = 0; /* set error */
257 /* Convert max cyl # -> # of cylinders */
258 bd->bd_cyl = ((v86.ecx & 0xc0) << 2) + ((v86.ecx & 0xff00) >> 8) + 1;
259 /* Convert max head # -> # of heads */
260 bd->bd_hds = ((v86.edx & 0xff00) >> 8) + 1;
261 bd->bd_sec = v86.ecx & 0x3f;
262 bd->bd_type = v86.ebx & 0xff;
263 bd->bd_flags |= BD_MODEINT13;
265 /* Calculate sectors count from the geometry */
266 bd->bd_sectors = bd->bd_cyl * bd->bd_hds * bd->bd_sec;
267 bd->bd_sectorsize = BIOSDISK_SECSIZE;
268 DEBUG("unit 0x%x geometry %d/%d/%d", bd->bd_unit, bd->bd_cyl,
269 bd->bd_hds, bd->bd_sec);
271 /* Determine if we can use EDD with this device. */
275 v86.edx = bd->bd_unit;
278 if (V86_CY(v86.efl) || /* carry set */
279 (v86.ebx & 0xffff) != 0xaa55 || /* signature */
280 (v86.ecx & EDD_INTERFACE_FIXED_DISK) == 0)
281 return (ret); /* return code from int13 AH=08 */
284 bd->bd_flags |= BD_MODEEDD1;
285 if ((v86.eax & 0xff00) >= 0x3000)
286 bd->bd_flags |= BD_MODEEDD3;
287 /* Get disk params */
288 params.len = sizeof(struct edd_params);
292 v86.edx = bd->bd_unit;
293 v86.ds = VTOPSEG(¶ms);
294 v86.esi = VTOPOFF(¶ms);
296 if (!V86_CY(v86.efl)) {
300 * Sector size must be a multiple of 512 bytes.
301 * An alternate test would be to check power of 2,
302 * powerof2(params.sector_size).
304 if (params.sector_size % BIOSDISK_SECSIZE)
305 bd->bd_sectorsize = BIOSDISK_SECSIZE;
307 bd->bd_sectorsize = params.sector_size;
309 total = bd->bd_sectorsize * params.sectors;
310 if (params.sectors != 0) {
311 /* Only update if we did not overflow. */
312 if (total > params.sectors)
313 bd->bd_sectors = params.sectors;
316 total = (uint64_t)params.cylinders *
317 params.heads * params.sectors_per_track;
318 if (bd->bd_sectors < total)
319 bd->bd_sectors = total;
323 DEBUG("unit 0x%x flags %x, sectors %llu, sectorsize %u",
324 bd->bd_unit, bd->bd_flags, bd->bd_sectors, bd->bd_sectorsize);
329 * Print information about disks
332 bd_print(int verbose)
334 static char line[80];
335 struct disk_devdesc dev;
341 printf("%s devices:", biosdisk.dv_name);
342 if ((ret = pager_output("\n")) != 0)
345 for (i = 0; i < nbdinfo; i++) {
346 snprintf(line, sizeof(line),
347 " disk%d: BIOS drive %c (%ju X %u):\n", i,
348 (bdinfo[i].bd_unit < 0x80) ? ('A' + bdinfo[i].bd_unit):
349 ('C' + bdinfo[i].bd_unit - 0x80),
350 (uintmax_t)bdinfo[i].bd_sectors,
351 bdinfo[i].bd_sectorsize);
352 if ((ret = pager_output(line)) != 0)
354 dev.dd.d_dev = &biosdisk;
357 dev.d_partition = -1;
359 bdinfo[i].bd_sectorsize * bdinfo[i].bd_sectors,
360 bdinfo[i].bd_sectorsize) == 0) {
361 snprintf(line, sizeof(line), " disk%d", i);
362 ret = disk_print(&dev, line, verbose);
372 * Attempt to open the disk described by (dev) for use by (f).
374 * Note that the philosophy here is "give them exactly what
375 * they ask for". This is necessary because being too "smart"
376 * about what the user might want leads to complications.
377 * (eg. given no slice or partition value, with a disk that is
378 * sliced - are they after the first BSD slice, or the DOS
382 bd_open(struct open_file *f, ...)
384 struct disk_devdesc *dev, rdev;
385 struct disk_devdesc disk;
391 dev = va_arg(ap, struct disk_devdesc *);
394 if (dev->dd.d_unit < 0 || dev->dd.d_unit >= nbdinfo)
397 if (BD(dev).bd_bcache == NULL)
398 BD(dev).bd_bcache = bcache_allocate();
401 * Read disk size from partition.
402 * This is needed to work around buggy BIOS systems returning
403 * wrong (truncated) disk media size.
404 * During bd_probe() we tested if the mulitplication of bd_sectors
405 * would overflow so it should be safe to perform here.
407 disk.dd.d_dev = dev->dd.d_dev;
408 disk.dd.d_unit = dev->dd.d_unit;
410 disk.d_partition = -1;
412 if (disk_open(&disk, BD(dev).bd_sectors * BD(dev).bd_sectorsize,
413 BD(dev).bd_sectorsize) == 0) {
415 if (disk_ioctl(&disk, DIOCGMEDIASIZE, &size) == 0) {
416 size /= BD(dev).bd_sectorsize;
417 if (size > BD(dev).bd_sectors)
418 BD(dev).bd_sectors = size;
423 err = disk_open(dev, BD(dev).bd_sectors * BD(dev).bd_sectorsize,
424 BD(dev).bd_sectorsize);
426 #ifdef LOADER_GELI_SUPPORT
427 static char gelipw[GELI_PW_MAXLEN];
433 /* if we already know there is no GELI, skip the rest */
434 if (geli_status[dev->dd.d_unit][dev->d_slice] != ISGELI_UNKNOWN)
438 struct ptable *table = NULL;
439 struct ptable_entry part;
440 struct pentry *entry;
443 dskp.drive = bd_unit2bios(dev->dd.d_unit);
444 dskp.type = dev->dd.d_dev->dv_type;
445 dskp.unit = dev->dd.d_unit;
446 dskp.slice = dev->d_slice;
447 dskp.part = dev->d_partition;
448 dskp.start = dev->d_offset;
450 memcpy(&rdev, dev, sizeof(rdev));
451 /* to read the GPT table, we need to read the first sector */
453 /* We need the LBA of the end of the partition */
454 table = ptable_open(&rdev, BD(dev).bd_sectors,
455 BD(dev).bd_sectorsize, ptblread);
457 DEBUG("Can't read partition table");
458 /* soft failure, return the exit status of disk_open */
462 if (table->type == PTABLE_GPT)
465 STAILQ_FOREACH(entry, &table->entries, entry) {
466 dskp.slice = entry->part.index;
467 dskp.start = entry->part.start;
468 if (is_geli(&dskp) == 0) {
469 geli_status[dev->dd.d_unit][dskp.slice] = ISGELI_YES;
472 if (geli_taste(bios_read, &dskp,
473 entry->part.end - entry->part.start) == 0) {
474 if (geli_havekey(&dskp) == 0) {
475 geli_status[dev->dd.d_unit][dskp.slice] = ISGELI_YES;
479 if ((passphrase = getenv("kern.geom.eli.passphrase"))
481 /* Use the cached passphrase */
482 bcopy(passphrase, &gelipw, GELI_PW_MAXLEN);
484 if (geli_passphrase(gelipw, dskp.unit, 'p',
485 (dskp.slice > 0 ? dskp.slice : dskp.part),
487 setenv("kern.geom.eli.passphrase", gelipw, 1);
488 bzero(gelipw, sizeof(gelipw));
489 geli_status[dev->dd.d_unit][dskp.slice] = ISGELI_YES;
494 geli_status[dev->dd.d_unit][dskp.slice] = ISGELI_NO;
497 /* none of the partitions on this disk have GELI */
498 if (geli_part == 0) {
500 geli_status[dev->dd.d_unit][dev->d_slice] = ISGELI_NO;
502 #endif /* LOADER_GELI_SUPPORT */
508 bd_close(struct open_file *f)
510 struct disk_devdesc *dev;
512 dev = (struct disk_devdesc *)f->f_devdata;
514 if (BD(dev).bd_open == 0) {
515 bcache_free(BD(dev).bd_bcache);
516 BD(dev).bd_bcache = NULL;
518 return (disk_close(dev));
522 bd_ioctl(struct open_file *f, u_long cmd, void *data)
524 struct disk_devdesc *dev;
527 dev = (struct disk_devdesc *)f->f_devdata;
529 rc = disk_ioctl(dev, cmd, data);
534 case DIOCGSECTORSIZE:
535 *(u_int *)data = BD(dev).bd_sectorsize;
538 *(uint64_t *)data = BD(dev).bd_sectors * BD(dev).bd_sectorsize;
547 bd_strategy(void *devdata, int rw, daddr_t dblk, size_t size,
548 char *buf, size_t *rsize)
550 struct bcache_devdata bcd;
551 struct disk_devdesc *dev;
553 dev = (struct disk_devdesc *)devdata;
554 bcd.dv_strategy = bd_realstrategy;
555 bcd.dv_devdata = devdata;
556 bcd.dv_cache = BD(dev).bd_bcache;
557 return (bcache_strategy(&bcd, rw, dblk + dev->d_offset,
562 bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size,
563 char *buf, size_t *rsize)
565 struct disk_devdesc *dev = (struct disk_devdesc *)devdata;
566 uint64_t disk_blocks;
568 #ifdef BD_SUPPORT_FRAGS /* XXX: sector size */
569 char fragbuf[BIOSDISK_SECSIZE];
572 fragsize = size % BIOSDISK_SECSIZE;
574 if (size % BD(dev).bd_sectorsize)
575 panic("bd_strategy: %d bytes I/O not multiple of block size", size);
578 DEBUG("open_disk %p", dev);
581 * Check the value of the size argument. We do have quite small
582 * heap (64MB), but we do not know good upper limit, so we check against
583 * INT_MAX here. This will also protect us against possible overflows
584 * while translating block count to bytes.
586 if (size > INT_MAX) {
587 DEBUG("too large read: %zu bytes", size);
591 blks = size / BD(dev).bd_sectorsize;
592 if (dblk > dblk + blks)
598 /* Get disk blocks, this value is either for whole disk or for partition */
599 if (disk_ioctl(dev, DIOCGMEDIASIZE, &disk_blocks)) {
600 /* DIOCGMEDIASIZE does return bytes. */
601 disk_blocks /= BD(dev).bd_sectorsize;
603 /* We should not get here. Just try to survive. */
604 disk_blocks = BD(dev).bd_sectors - dev->d_offset;
607 /* Validate source block address. */
608 if (dblk < dev->d_offset || dblk >= dev->d_offset + disk_blocks)
612 * Truncate if we are crossing disk or partition end.
614 if (dblk + blks >= dev->d_offset + disk_blocks) {
615 blks = dev->d_offset + disk_blocks - dblk;
616 size = blks * BD(dev).bd_sectorsize;
617 DEBUG("short read %d", blks);
620 switch (rw & F_MASK) {
622 DEBUG("read %d from %lld to %p", blks, dblk, buf);
624 if (blks && (rc = bd_read(dev, dblk, blks, buf))) {
625 /* Filter out floppy controller errors */
626 if (BD(dev).bd_flags != BD_FLOPPY || rc != 0x20) {
627 printf("read %d from %lld to %p, error: 0x%x", blks, dblk,
632 #ifdef BD_SUPPORT_FRAGS /* XXX: sector size */
633 DEBUG("bd_strategy: frag read %d from %d+%d to %p",
634 fragsize, dblk, blks, buf + (blks * BIOSDISK_SECSIZE));
635 if (fragsize && bd_read(od, dblk + blks, 1, fragsize)) {
636 DEBUG("frag read error");
639 bcopy(fragbuf, buf + (blks * BIOSDISK_SECSIZE), fragsize);
643 DEBUG("write %d from %d to %p", blks, dblk, buf);
645 if (blks && bd_write(dev, dblk, blks, buf)) {
646 DEBUG("write error");
649 #ifdef BD_SUPPORT_FRAGS
651 DEBUG("Attempted to write a frag");
667 bd_edd_io(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest,
670 static struct edd_packet packet;
672 packet.len = sizeof(struct edd_packet);
674 packet.off = VTOPOFF(dest);
675 packet.seg = VTOPSEG(dest);
680 /* Should we Write with verify ?? 0x4302 ? */
684 v86.edx = BD(dev).bd_unit;
685 v86.ds = VTOPSEG(&packet);
686 v86.esi = VTOPOFF(&packet);
689 return (v86.eax >> 8);
694 bd_chs_io(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest,
697 u_int x, bpc, cyl, hd, sec;
699 bpc = BD(dev).bd_sec * BD(dev).bd_hds; /* blocks per cylinder */
701 cyl = x / bpc; /* block # / blocks per cylinder */
702 x %= bpc; /* block offset into cylinder */
703 hd = x / BD(dev).bd_sec; /* offset / blocks per track */
704 sec = x % BD(dev).bd_sec; /* offset into track */
706 /* correct sector number for 1-based BIOS numbering */
710 /* CHS doesn't support cylinders > 1023. */
716 v86.eax = 0x300 | blks;
718 v86.eax = 0x200 | blks;
719 v86.ecx = ((cyl & 0xff) << 8) | ((cyl & 0x300) >> 2) | sec;
720 v86.edx = (hd << 8) | BD(dev).bd_unit;
721 v86.es = VTOPSEG(dest);
722 v86.ebx = VTOPOFF(dest);
725 return (v86.eax >> 8);
730 bd_io_workaround(struct disk_devdesc *dev)
732 uint8_t buf[8 * 1024];
734 bd_edd_io(dev, 0xffffffff, 1, (caddr_t)buf, 0);
739 bd_io(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest, int write)
741 u_int x, sec, result, resid, retry, maxfer;
744 /* Just in case some idiot actually tries to read/write -1 blocks... */
752 * Workaround for a problem with some HP ProLiant BIOS failing to work out
753 * the boot disk after installation. hrs and kuriyama discovered this
754 * problem with an HP ProLiant DL320e Gen 8 with a 3TB HDD, and discovered
755 * that an int13h call seems to cause a buffer overrun in the bios. The
756 * problem is alleviated by doing an extra read before the buggy read. It
757 * is not immediately known whether other models are similarly affected.
759 if (dblk >= 0x100000000)
760 bd_io_workaround(dev);
762 /* Decide whether we have to bounce */
763 if (VTOP(dest) >> 20 != 0 || (BD(dev).bd_unit < 0x80 &&
764 (VTOP(dest) >> 16) != (VTOP(dest +
765 blks * BD(dev).bd_sectorsize) >> 16))) {
768 * There is a 64k physical boundary somewhere in the
769 * destination buffer, or the destination buffer is above
770 * first 1MB of physical memory so we have to arrange a
771 * suitable bounce buffer. Allocate a buffer twice as large
772 * as we need to. Use the bottom half unless there is a break
773 * there, in which case we use the top half.
775 x = V86_IO_BUFFER_SIZE / BD(dev).bd_sectorsize;
776 x = min(x, (unsigned)blks);
777 bbuf = PTOV(V86_IO_BUFFER);
778 maxfer = x; /* limit transfers to bounce region size */
786 * Play it safe and don't cross track boundaries.
787 * (XXX this is probably unnecessary)
789 sec = dblk % BD(dev).bd_sec; /* offset into track */
790 x = min(BD(dev).bd_sec - sec, resid);
792 x = min(x, maxfer); /* fit bounce buffer */
794 /* where do we transfer to? */
795 xp = bbuf == NULL ? p : bbuf;
798 * Put your Data In, Put your Data out,
799 * Put your Data In, and shake it all about
801 if (write && bbuf != NULL)
802 bcopy(p, bbuf, x * BD(dev).bd_sectorsize);
805 * Loop retrying the operation a couple of times. The BIOS
808 for (retry = 0; retry < 3; retry++) {
809 /* if retrying, reset the drive */
814 v86.edx = BD(dev).bd_unit;
818 if (BD(dev).bd_flags & BD_MODEEDD1)
819 result = bd_edd_io(dev, dblk, x, xp, write);
821 result = bd_chs_io(dev, dblk, x, xp, write);
827 DEBUG("Write %d sector(s) from %p (0x%x) to %lld %s", x,
828 p, VTOP(p), dblk, result ? "failed" : "ok");
830 DEBUG("Read %d sector(s) from %lld to %p (0x%x) %s", x,
831 dblk, p, VTOP(p), result ? "failed" : "ok");
835 if (!write && bbuf != NULL)
836 bcopy(bbuf, p, x * BD(dev).bd_sectorsize);
837 p += (x * BD(dev).bd_sectorsize);
842 /* hexdump(dest, (blks * BD(dev).bd_sectorsize)); */
847 bd_read(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest)
849 #ifdef LOADER_GELI_SUPPORT
853 int err, n, alignblks;
856 /* if we already know there is no GELI, skip the rest */
857 if (geli_status[dev->dd.d_unit][dev->d_slice] != ISGELI_YES)
858 return (bd_io(dev, dblk, blks, dest, 0));
860 if (geli_status[dev->dd.d_unit][dev->d_slice] == ISGELI_YES) {
862 * Align reads to DEV_GELIBOOT_BSIZE bytes because partial
863 * sectors cannot be decrypted. Round the requested LBA down to
864 * nearest multiple of DEV_GELIBOOT_BSIZE bytes.
866 alignlba = rounddown2(dblk * BD(dev).bd_sectorsize,
867 DEV_GELIBOOT_BSIZE) / BD(dev).bd_sectorsize;
869 * Round number of blocks to read up to nearest multiple of
872 diff = (dblk - alignlba) * BD(dev).bd_sectorsize;
873 alignblks = roundup2(blks * BD(dev).bd_sectorsize + diff,
874 DEV_GELIBOOT_BSIZE) / BD(dev).bd_sectorsize;
877 * If the read is rounded up to a larger size, use a temporary
878 * buffer here because the buffer provided by the caller may be
884 tmpbuf = malloc(alignblks * BD(dev).bd_sectorsize);
885 if (tmpbuf == NULL) {
890 err = bd_io(dev, alignlba, alignblks, tmpbuf, 0);
894 dskp.drive = bd_unit2bios(dev->dd.d_unit);
895 dskp.type = dev->dd.d_dev->dv_type;
896 dskp.unit = dev->dd.d_unit;
897 dskp.slice = dev->d_slice;
898 dskp.part = dev->d_partition;
899 dskp.start = dev->d_offset;
901 /* GELI needs the offset relative to the partition start */
902 p_off = alignlba - dskp.start;
904 err = geli_read(&dskp, p_off * BD(dev).bd_sectorsize, (u_char *)tmpbuf,
905 alignblks * BD(dev).bd_sectorsize);
909 if (tmpbuf != dest) {
910 bcopy(tmpbuf + diff, dest, blks * BD(dev).bd_sectorsize);
915 #endif /* LOADER_GELI_SUPPORT */
917 return (bd_io(dev, dblk, blks, dest, 0));
921 bd_write(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest)
924 return (bd_io(dev, dblk, blks, dest, 1));
928 * Return the BIOS geometry of a given "fixed drive" in a format
929 * suitable for the legacy bootinfo structure. Since the kernel is
930 * expecting raw int 0x13/0x8 values for N_BIOS_GEOM drives, we
931 * prefer to get the information directly, rather than rely on being
932 * able to put it together from information already maintained for
933 * different purposes and for a probably different number of drives.
935 * For valid drives, the geometry is expected in the format (31..0)
936 * "000000cc cccccccc hhhhhhhh 00ssssss"; and invalid drives are
937 * indicated by returning the geometry of a "1.2M" PC-format floppy
938 * disk. And, incidentally, what is returned is not the geometry as
939 * such but the highest valid cylinder, head, and sector numbers.
942 bd_getbigeom(int bunit)
948 v86.edx = 0x80 + bunit;
952 return ((v86.ecx & 0xc0) << 18) | ((v86.ecx & 0xff00) << 8) |
953 (v86.edx & 0xff00) | (v86.ecx & 0x3f);
957 * Return a suitable dev_t value for (dev).
959 * In the case where it looks like (dev) is a SCSI disk, we allow the number of
960 * IDE disks to be specified in $num_ide_disks. There should be a Better Way.
963 bd_getdev(struct i386_devdesc *d)
965 struct disk_devdesc *dev;
972 dev = (struct disk_devdesc *)d;
973 biosdev = bd_unit2bios(dev->dd.d_unit);
974 DEBUG("unit %d BIOS device %d", dev->dd.d_unit, biosdev);
975 if (biosdev == -1) /* not a BIOS device */
977 if (disk_open(dev, BD(dev).bd_sectors * BD(dev).bd_sectorsize,
978 BD(dev).bd_sectorsize) != 0) /* oops, not a viable device */
983 if (biosdev < 0x80) {
984 /* floppy (or emulated floppy) or ATAPI device */
985 if (bdinfo[dev->dd.d_unit].bd_type == DT_ATAPI) {
986 /* is an ATAPI disk */
989 /* is a floppy disk */
993 /* assume an IDE disk */
996 /* default root disk unit number */
997 unit = biosdev & 0x7f;
999 /* XXX a better kludge to set the root disk unit number */
1000 if ((nip = getenv("root_disk_unit")) != NULL) {
1001 i = strtol(nip, &cp, 0);
1002 /* check for parse error */
1003 if ((cp != nip) && (*cp == 0))
1007 rootdev = MAKEBOOTDEV(major, dev->d_slice + 1, unit, dev->d_partition);
1008 DEBUG("dev is 0x%x\n", rootdev);
1012 #ifdef LOADER_GELI_SUPPORT
1014 bios_read(void *vdev __unused, void *xpriv, off_t off, void *buf, size_t bytes)
1016 struct disk_devdesc dev;
1017 struct dsk *priv = xpriv;
1019 dev.dd.d_dev = &biosdisk;
1020 dev.dd.d_unit = priv->unit;
1021 dev.d_slice = priv->slice;
1022 dev.d_partition = priv->part;
1023 dev.d_offset = priv->start;
1025 off = off / BD(&dev).bd_sectorsize;
1026 /* GELI gives us the offset relative to the partition start */
1027 off += dev.d_offset;
1028 bytes = bytes / BD(&dev).bd_sectorsize;
1030 return (bd_io(&dev, off, bytes, buf, 0));
1032 #endif /* LOADER_GELI_SUPPORT */