2 * Copyright (c) 1994 Bruce D. Evans.
5 * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
37 * from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $
38 * $FreeBSD: src/sys/kern/subr_diskmbr.c,v 1.45 2000/01/28 10:22:07 bde Exp $
41 #include <sys/param.h>
42 #include <sys/systm.h>
45 #include <sys/diskslice.h>
46 #define DOSPTYP_EXTENDED 5
47 #define DOSPTYP_EXTENDEDX 15
48 #define DOSPTYP_ONTRACK 84
49 #include <sys/diskmbr.h>
51 #include <sys/malloc.h>
52 #include <sys/syslog.h>
53 #include <sys/device.h>
55 #define TRACE(str) do { if (dsi_debug) kprintf str; } while (0)
57 static volatile u_char dsi_debug;
60 * This is what we have embedded in every boot1 for supporting the bogus
61 * "Dangerously Dedicated" mode. However, the old table is broken because
62 * it has an illegal geometry in it - it specifies 256 heads (heads = end
63 * head + 1) which causes nasty stuff when that wraps to zero in bios code.
64 * eg: divide by zero etc. This caused the dead-thinkpad problem, numerous
65 * SCSI bios crashes, EFI to crash, etc.
67 * We still have to recognize the old table though, even though we stopped
68 * inflicting it upon the world.
70 static struct dos_partition historical_bogus_partition_table[NDOSPART] = {
71 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
72 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
73 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
74 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, },
76 static struct dos_partition historical_bogus_partition_table_fixed[NDOSPART] = {
77 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
78 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
79 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
80 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 254, 255, 255, 0, 50000, },
83 static int check_part (char *sname, struct dos_partition *dp,
84 u_int64_t offset, int nsectors, int ntracks,
85 u_int64_t mbr_offset);
86 static void mbr_extended (cdev_t dev, struct disk_info *info,
87 struct diskslices *ssp, u_int64_t ext_offset,
88 u_int64_t ext_size, u_int64_t base_ext_offset,
89 int nsectors, int ntracks, u_int64_t mbr_offset,
91 static int mbr_setslice (char *sname, struct disk_info *info,
92 struct diskslice *sp, struct dos_partition *dp,
97 mbrinit(cdev_t dev, struct disk_info *info, struct diskslices **sspp)
102 struct dos_partition *dp;
103 struct dos_partition *dp0;
104 struct dos_partition dpcopy[NDOSPART];
109 u_int64_t mbr_offset;
112 char *sname = "tempname";
113 struct diskslice *sp;
114 struct diskslices *ssp;
117 mbr_offset = DOSBBSECTOR;
120 * Don't bother if the block size is weird or the
121 * media size is 0 (probably means no media present).
123 if (info->d_media_blksize & DEV_BMASK)
125 if (info->d_media_size == 0)
129 * Read master boot record.
132 bp = geteblk((int)info->d_media_blksize);
133 bp->b_bio1.bio_offset = (off_t)mbr_offset * info->d_media_blksize;
134 bp->b_bio1.bio_done = biodone_sync;
135 bp->b_bio1.bio_flags |= BIO_SYNC;
136 bp->b_bcount = info->d_media_blksize;
137 bp->b_cmd = BUF_CMD_READ;
138 dev_dstrategy(wdev, &bp->b_bio1);
139 if (biowait(&bp->b_bio1, "mbrrd") != 0) {
140 if ((info->d_dsflags & DSO_MBRQUIET) == 0) {
141 diskerr(&bp->b_bio1, wdev,
142 "reading primary partition table: error",
150 /* Weakly verify it. */
152 sname = dsname(dev, 0, 0, 0, NULL);
153 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
155 kprintf("%s: invalid primary partition table: no magic\n",
161 /* Make a copy of the partition table to avoid alignment problems. */
162 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
167 * Check for "Ontrack Diskmanager" or GPT. If a GPT is found in
168 * the first dos partition, ignore the rest of the MBR and go
171 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
173 (dp->dp_typ == DOSPTYP_PMBR || dp->dp_typ == DOSPTYP_GPT)) {
176 "%s: Found GPT in slice #%d\n", sname, dospart + 1);
177 error = gptinit(dev, info, sspp);
181 if (dp->dp_typ == DOSPTYP_ONTRACK) {
184 "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname);
185 bp->b_flags |= B_INVAL | B_AGE;
192 if (bcmp(dp0, historical_bogus_partition_table,
193 sizeof historical_bogus_partition_table) == 0 ||
194 bcmp(dp0, historical_bogus_partition_table_fixed,
195 sizeof historical_bogus_partition_table_fixed) == 0) {
197 TRACE(("%s: invalid primary partition table: historical\n",
202 "%s: invalid primary partition table: Dangerously Dedicated (ignored)\n",
208 /* Guess the geometry. */
211 * Perhaps skip entries with 0 size.
212 * Perhaps only look at entries of type DOSPTYP_386BSD.
217 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
222 ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1;
223 if (max_ncyls < ncyls)
225 nsectors = DPSECT(dp->dp_esect);
226 if (max_nsectors < nsectors)
227 max_nsectors = nsectors;
228 ntracks = dp->dp_ehd + 1;
229 if (max_ntracks < ntracks)
230 max_ntracks = ntracks;
234 * Check that we have guessed the geometry right by checking the
240 * Check for overlaps.
241 * Check against d_secperunit if the latter is reliable.
244 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
245 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
246 && dp->dp_start == 0 && dp->dp_size == 0)
248 //sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
249 // WHOLE_SLICE_PART, partname);
252 * Temporarily ignore errors from this check. We could
253 * simplify things by accepting the table eariler if we
254 * always ignore errors here. Perhaps we should always
255 * accept the table if the magic is right but not let
256 * bad entries affect the geometry.
258 check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks,
265 * Accept the DOS partition table.
267 * Adjust the disk information structure with updated CHS
268 * conversion parameters, but only use values extracted from
269 * the primary partition table.
271 * NOTE! Regardless of our having to deal with this old cruft,
272 * we do not screw around with the info->d_media* parameters.
274 secpercyl = (u_long)max_nsectors * max_ntracks;
275 if (secpercyl != 0 && mbr_offset == DOSBBSECTOR) {
276 info->d_secpertrack = max_nsectors;
277 info->d_nheads = max_ntracks;
278 info->d_secpercyl = secpercyl;
279 info->d_ncylinders = info->d_media_blocks / secpercyl;
283 * We are passed a pointer to a suitably initialized minimal
284 * slices "struct" with no dangling pointers in it. Replace it
285 * by a maximal one. This usually oversizes the "struct", but
286 * enlarging it while searching for logical drives would be
289 kfree(*sspp, M_DEVBUF);
290 ssp = dsmakeslicestruct(MAX_SLICES, info);
293 /* Initialize normal slices. */
294 sp = &ssp->dss_slices[BASE_SLICE];
295 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) {
296 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
297 WHOLE_SLICE_PART, partname);
298 (void)mbr_setslice(sname, info, sp, dp, mbr_offset);
300 ssp->dss_nslices = BASE_SLICE + NDOSPART;
302 /* Handle extended partitions. */
304 for (dospart = 0; dospart < NDOSPART; dospart++, sp++) {
305 if (sp->ds_type == DOSPTYP_EXTENDED ||
306 sp->ds_type == DOSPTYP_EXTENDEDX) {
307 mbr_extended(wdev, info, ssp,
308 sp->ds_offset, sp->ds_size, sp->ds_offset,
309 max_nsectors, max_ntracks, mbr_offset, 1);
314 * mbr_extended() abuses ssp->dss_nslices for the number of slices
315 * that would be found if there were no limit on the number of slices
316 * in *ssp. Cut it back now.
318 if (ssp->dss_nslices > MAX_SLICES)
319 ssp->dss_nslices = MAX_SLICES;
322 bp->b_flags |= B_INVAL | B_AGE;
330 check_part(char *sname, struct dos_partition *dp, u_int64_t offset,
331 int nsectors, int ntracks, u_int64_t mbr_offset)
344 secpercyl = (u_long)nsectors * ntracks;
345 chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect);
346 chs_ssect = DPSECT(dp->dp_ssect);
347 ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl
349 ssector1 = offset + dp->dp_start;
352 * If ssector1 is on a cylinder >= 1024, then ssector can't be right.
353 * Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct
354 * apart from the cylinder being reduced modulo 1024. Always allow
355 * 1023/255/63, because this is the official way to represent
356 * pure-LBA for the starting position.
358 if ((ssector < ssector1
359 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1
362 && (ssector1 - ssector) % (1024 * secpercyl) == 0)))
363 || (dp->dp_scyl == 255 && dp->dp_shd == 255
364 && dp->dp_ssect == 255)) {
365 TRACE(("%s: C/H/S start %d/%d/%d, start %llu: allow\n",
366 sname, chs_scyl, dp->dp_shd, chs_ssect,
367 (long long)ssector1));
371 chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect);
372 chs_esect = DPSECT(dp->dp_esect);
373 esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl
375 esector1 = ssector1 + dp->dp_size - 1;
378 * Allow certain bogus C/H/S values for esector, as above. However,
379 * heads == 255 isn't really legal and causes some BIOS crashes. The
380 * correct value to indicate a pure-LBA end is 1023/heads-1/sectors -
381 * usually 1023/254/63. "heads" is base 0, "sectors" is base 1.
383 if ((esector < esector1
384 && ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1
387 && (esector1 - esector) % (1024 * secpercyl) == 0)))
388 || (dp->dp_ecyl == 255 && dp->dp_ehd == 255
389 && dp->dp_esect == 255)) {
390 TRACE(("%s: C/H/S end %d/%d/%d, end %llu: allow\n",
391 sname, chs_ecyl, dp->dp_ehd, chs_esect,
392 (long long)esector1));
396 error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL;
398 kprintf("%s: type 0x%x, start %llu, end = %llu, size %u %s\n",
400 (long long)ssector1, (long long)esector1,
401 dp->dp_size, (error ? "" : ": OK"));
402 if (ssector != ssector1 && bootverbose)
403 kprintf("%s: C/H/S start %d/%d/%d (%llu) != start %llu: invalid\n",
404 sname, chs_scyl, dp->dp_shd, chs_ssect,
405 (long long)ssector, (long long)ssector1);
406 if (esector != esector1 && bootverbose)
407 kprintf("%s: C/H/S end %d/%d/%d (%llu) != end %llu: invalid\n",
408 sname, chs_ecyl, dp->dp_ehd, chs_esect,
409 (long long)esector, (long long)esector1);
415 mbr_extended(cdev_t dev, struct disk_info *info, struct diskslices *ssp,
416 u_int64_t ext_offset, u_int64_t ext_size, u_int64_t base_ext_offset,
417 int nsectors, int ntracks, u_int64_t mbr_offset, int level)
422 struct dos_partition *dp;
423 struct dos_partition dpcopy[NDOSPART];
424 u_int64_t ext_offsets[NDOSPART];
425 u_int64_t ext_sizes[NDOSPART];
429 struct diskslice *sp;
433 "%s: excessive recursion in search for slices; aborting search\n",
438 /* Read extended boot record. */
439 bp = geteblk((int)info->d_media_blksize);
440 bp->b_bio1.bio_offset = (off_t)ext_offset * info->d_media_blksize;
441 bp->b_bio1.bio_done = biodone_sync;
442 bp->b_bio1.bio_flags |= BIO_SYNC;
443 bp->b_bcount = info->d_media_blksize;
444 bp->b_cmd = BUF_CMD_READ;
445 dev_dstrategy(dev, &bp->b_bio1);
446 if (biowait(&bp->b_bio1, "mbrrd") != 0) {
447 diskerr(&bp->b_bio1, dev,
448 "reading extended partition table: error",
454 /* Weakly verify it. */
456 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
457 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, WHOLE_SLICE_PART,
460 kprintf("%s: invalid extended partition table: no magic\n",
465 /* Make a copy of the partition table to avoid alignment problems. */
466 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
468 slice = ssp->dss_nslices;
469 for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART;
471 ext_sizes[dospart] = 0;
472 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
473 && dp->dp_start == 0 && dp->dp_size == 0)
475 if (dp->dp_typ == DOSPTYP_EXTENDED ||
476 dp->dp_typ == DOSPTYP_EXTENDEDX) {
479 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE,
480 WHOLE_SLICE_PART, partname);
481 ksnprintf(buf, sizeof(buf), "%s", sname);
482 if (strlen(buf) < sizeof buf - 11)
483 strcat(buf, "<extended>");
484 check_part(buf, dp, base_ext_offset, nsectors,
485 ntracks, mbr_offset);
486 ext_offsets[dospart] = base_ext_offset + dp->dp_start;
487 ext_sizes[dospart] = dp->dp_size;
489 sname = dsname(dev, dkunit(dev), slice, WHOLE_SLICE_PART,
491 check_part(sname, dp, ext_offset, nsectors, ntracks,
493 if (slice >= MAX_SLICES) {
494 kprintf("%s: too many slices\n", sname);
498 sp = &ssp->dss_slices[slice];
499 if (mbr_setslice(sname, info, sp, dp, ext_offset) != 0)
504 ssp->dss_nslices = slice;
506 /* If we found any more slices, recursively find all the subslices. */
507 for (dospart = 0; dospart < NDOSPART; dospart++) {
508 if (ext_sizes[dospart] != 0) {
509 mbr_extended(dev, info, ssp, ext_offsets[dospart],
510 ext_sizes[dospart], base_ext_offset,
511 nsectors, ntracks, mbr_offset, ++level);
516 bp->b_flags |= B_INVAL | B_AGE;
521 mbr_setslice(char *sname, struct disk_info *info, struct diskslice *sp,
522 struct dos_partition *dp, u_int64_t br_offset)
527 offset = br_offset + dp->dp_start;
528 if (offset > info->d_media_blocks || offset < br_offset) {
530 "%s: slice starts beyond end of the disk: rejecting it\n",
534 size = info->d_media_blocks - offset;
535 if (size >= dp->dp_size) {
536 if (dp->dp_size == 0xFFFFFFFFU) {
537 kprintf("%s: slice >2TB, using media size instead "
538 "of slice table size\n", sname);
543 kprintf("%s: slice extends beyond end of disk: "
544 "truncating from %u to %llu sectors\n",
545 sname, dp->dp_size, (unsigned long long)size);
547 sp->ds_offset = offset;
549 sp->ds_type = dp->dp_typ;
550 bzero(&sp->ds_type_uuid, sizeof(sp->ds_type_uuid));
551 bzero(&sp->ds_stor_uuid, sizeof(sp->ds_type_uuid));
554 * Slices do not overlap with the parent (if any).