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>
47 #define dsinit atcompat_dsinit
49 #include <sys/disklabel.h>
50 #define DOSPTYP_EXTENDED 5
51 #define DOSPTYP_EXTENDEDX 15
52 #define DOSPTYP_ONTRACK 84
53 #include <sys/diskslice.h>
54 #include <sys/malloc.h>
55 #include <sys/syslog.h>
57 #define TRACE(str) do { if (dsi_debug) printf str; } while (0)
59 static volatile u_char dsi_debug;
61 static struct dos_partition historical_bogus_partition_table[NDOSPART] = {
62 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
63 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
64 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
65 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, },
68 static int check_part __P((char *sname, struct dos_partition *dp,
69 u_long offset, int nsectors, int ntracks,
71 static void mbr_extended __P((dev_t dev, struct disklabel *lp,
72 struct diskslices *ssp, u_long ext_offset,
73 u_long ext_size, u_long base_ext_offset,
74 int nsectors, int ntracks, u_long mbr_offset,
76 static int mbr_setslice __P((char *sname, struct disklabel *lp,
77 struct diskslice *sp, struct dos_partition *dp,
81 check_part(sname, dp, offset, nsectors, ntracks, mbr_offset )
83 struct dos_partition *dp;
100 secpercyl = (u_long)nsectors * ntracks;
101 chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect);
102 chs_ssect = DPSECT(dp->dp_ssect);
103 ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl
105 ssector1 = offset + dp->dp_start;
108 * If ssector1 is on a cylinder >= 1024, then ssector can't be right.
109 * Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct
110 * apart from the cylinder being reduced modulo 1024. Always allow
113 if ((ssector < ssector1
114 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1
117 && (ssector1 - ssector) % (1024 * secpercyl) == 0)))
118 || (dp->dp_scyl == 255 && dp->dp_shd == 255
119 && dp->dp_ssect == 255)) {
120 TRACE(("%s: C/H/S start %d/%d/%d, start %lu: allow\n",
121 sname, chs_scyl, dp->dp_shd, chs_ssect, ssector1));
125 chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect);
126 chs_esect = DPSECT(dp->dp_esect);
127 esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl
129 esector1 = ssector1 + dp->dp_size - 1;
131 /* Allow certain bogus C/H/S values for esector, as above. */
132 if ((esector < esector1
133 && ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1
136 && (esector1 - esector) % (1024 * secpercyl) == 0)))
137 || (dp->dp_ecyl == 255 && dp->dp_ehd == 255
138 && dp->dp_esect == 255)) {
139 TRACE(("%s: C/H/S end %d/%d/%d, end %lu: allow\n",
140 sname, chs_ecyl, dp->dp_ehd, chs_esect, esector1));
144 error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL;
146 printf("%s: type 0x%x, start %lu, end = %lu, size %lu %s\n",
147 sname, dp->dp_typ, ssector1, esector1,
148 (u_long)dp->dp_size, error ? "" : ": OK");
149 if (ssector != ssector1 && bootverbose)
150 printf("%s: C/H/S start %d/%d/%d (%lu) != start %lu: invalid\n",
151 sname, chs_scyl, dp->dp_shd, chs_ssect,
153 if (esector != esector1 && bootverbose)
154 printf("%s: C/H/S end %d/%d/%d (%lu) != end %lu: invalid\n",
155 sname, chs_ecyl, dp->dp_ehd, chs_esect,
161 dsinit(dev, lp, sspp)
163 struct disklabel *lp;
164 struct diskslices **sspp;
169 struct dos_partition *dp;
170 struct dos_partition *dp0;
171 struct dos_partition dpcopy[NDOSPART];
180 struct diskslice *sp;
181 struct diskslices *ssp;
183 mbr_offset = DOSBBSECTOR;
185 /* Read master boot record. */
186 bp = geteblk((int)lp->d_secsize);
187 bp->b_dev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
188 bp->b_blkno = mbr_offset;
189 bp->b_bcount = lp->d_secsize;
190 bp->b_flags |= B_READ;
192 if (biowait(bp) != 0) {
193 diskerr(bp, "reading primary partition table: error",
194 LOG_PRINTF, 0, (struct disklabel *)NULL);
200 /* Weakly verify it. */
202 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname);
203 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
205 printf("%s: invalid primary partition table: no magic\n",
211 /* Make a copy of the partition table to avoid alignment problems. */
212 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
216 /* Check for "Ontrack Diskmanager". */
217 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
218 if (dp->dp_typ == DOSPTYP_ONTRACK) {
221 "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname);
222 bp->b_flags |= B_INVAL | B_AGE;
229 if (bcmp(dp0, historical_bogus_partition_table,
230 sizeof historical_bogus_partition_table) == 0) {
231 TRACE(("%s: invalid primary partition table: historical\n",
237 /* Guess the geometry. */
240 * Perhaps skip entries with 0 size.
241 * Perhaps only look at entries of type DOSPTYP_386BSD.
246 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
251 ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1;
252 if (max_ncyls < ncyls)
254 nsectors = DPSECT(dp->dp_esect);
255 if (max_nsectors < nsectors)
256 max_nsectors = nsectors;
257 ntracks = dp->dp_ehd + 1;
258 if (max_ntracks < ntracks)
259 max_ntracks = ntracks;
263 * Check that we have guessed the geometry right by checking the
269 * Check for overlaps.
270 * Check against d_secperunit if the latter is reliable.
273 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
274 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
275 && dp->dp_start == 0 && dp->dp_size == 0)
277 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
281 * Temporarily ignore errors from this check. We could
282 * simplify things by accepting the table eariler if we
283 * always ignore errors here. Perhaps we should always
284 * accept the table if the magic is right but not let
285 * bad entries affect the geometry.
287 check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks,
294 * Accept the DOS partition table.
295 * First adjust the label (we have been careful not to change it
296 * before we can guarantee success).
298 secpercyl = (u_long)max_nsectors * max_ntracks;
299 if (secpercyl != 0) {
304 lp->d_nsectors = max_nsectors;
305 lp->d_ntracks = max_ntracks;
306 lp->d_secpercyl = secpercyl;
308 * Temporarily, don't even consider adjusting the drive's
309 * size, since the adjusted size may exceed the hardware's
310 * addressing capabilities. The adjustment helped mainly
311 * for ancient MFM drives with > 1024 cylinders, but now
312 * breaks at least IDE drives with 63*16*65536 sectors if
313 * they are controlled by the wd driver in CHS mode.
316 secperunit = secpercyl * max_ncyls;
317 if (lp->d_secperunit < secperunit)
318 lp->d_secperunit = secperunit;
320 lp->d_ncylinders = lp->d_secperunit / secpercyl;
324 * We are passed a pointer to a suitably initialized minimal
325 * slices "struct" with no dangling pointers in it. Replace it
326 * by a maximal one. This usually oversizes the "struct", but
327 * enlarging it while searching for logical drives would be
330 free(*sspp, M_DEVBUF);
331 ssp = dsmakeslicestruct(MAX_SLICES, lp);
334 /* Initialize normal slices. */
335 sp = &ssp->dss_slices[BASE_SLICE];
336 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) {
337 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
339 (void)mbr_setslice(sname, lp, sp, dp, mbr_offset);
341 ssp->dss_nslices = BASE_SLICE + NDOSPART;
343 /* Handle extended partitions. */
345 for (dospart = 0; dospart < NDOSPART; dospart++, sp++)
346 if (sp->ds_type == DOSPTYP_EXTENDED ||
347 sp->ds_type == DOSPTYP_EXTENDEDX)
348 mbr_extended(bp->b_dev, lp, ssp,
349 sp->ds_offset, sp->ds_size, sp->ds_offset,
350 max_nsectors, max_ntracks, mbr_offset, 1);
353 * mbr_extended() abuses ssp->dss_nslices for the number of slices
354 * that would be found if there were no limit on the number of slices
355 * in *ssp. Cut it back now.
357 if (ssp->dss_nslices > MAX_SLICES)
358 ssp->dss_nslices = MAX_SLICES;
361 bp->b_flags |= B_INVAL | B_AGE;
369 mbr_extended(dev, lp, ssp, ext_offset, ext_size, base_ext_offset, nsectors,
370 ntracks, mbr_offset, level)
372 struct disklabel *lp;
373 struct diskslices *ssp;
376 u_long base_ext_offset;
385 struct dos_partition *dp;
386 struct dos_partition dpcopy[NDOSPART];
387 u_long ext_offsets[NDOSPART];
388 u_long ext_sizes[NDOSPART];
392 struct diskslice *sp;
396 "%s: excessive recursion in search for slices; aborting search\n",
401 /* Read extended boot record. */
402 bp = geteblk((int)lp->d_secsize);
404 bp->b_blkno = ext_offset;
405 bp->b_bcount = lp->d_secsize;
406 bp->b_flags |= B_READ;
408 if (biowait(bp) != 0) {
409 diskerr(bp, "reading extended partition table: error",
410 LOG_PRINTF, 0, (struct disklabel *)NULL);
415 /* Weakly verify it. */
417 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
418 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART,
421 printf("%s: invalid extended partition table: no magic\n",
426 /* Make a copy of the partition table to avoid alignment problems. */
427 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
429 slice = ssp->dss_nslices;
430 for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART;
432 ext_sizes[dospart] = 0;
433 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
434 && dp->dp_start == 0 && dp->dp_size == 0)
436 if (dp->dp_typ == DOSPTYP_EXTENDED ||
437 dp->dp_typ == DOSPTYP_EXTENDEDX) {
440 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE,
442 snprintf(buf, sizeof(buf), "%s", sname);
443 if (strlen(buf) < sizeof buf - 11)
444 strcat(buf, "<extended>");
445 check_part(buf, dp, base_ext_offset, nsectors,
446 ntracks, mbr_offset);
447 ext_offsets[dospart] = base_ext_offset + dp->dp_start;
448 ext_sizes[dospart] = dp->dp_size;
450 sname = dsname(dev, dkunit(dev), slice, RAW_PART,
452 check_part(sname, dp, ext_offset, nsectors, ntracks,
454 if (slice >= MAX_SLICES) {
455 printf("%s: too many slices\n", sname);
459 sp = &ssp->dss_slices[slice];
460 if (mbr_setslice(sname, lp, sp, dp, ext_offset) != 0)
465 ssp->dss_nslices = slice;
467 /* If we found any more slices, recursively find all the subslices. */
468 for (dospart = 0; dospart < NDOSPART; dospart++)
469 if (ext_sizes[dospart] != 0)
470 mbr_extended(dev, lp, ssp, ext_offsets[dospart],
471 ext_sizes[dospart], base_ext_offset,
472 nsectors, ntracks, mbr_offset, ++level);
475 bp->b_flags |= B_INVAL | B_AGE;
480 mbr_setslice(sname, lp, sp, dp, br_offset)
482 struct disklabel *lp;
483 struct diskslice *sp;
484 struct dos_partition *dp;
490 offset = br_offset + dp->dp_start;
491 if (offset > lp->d_secperunit || offset < br_offset) {
493 "%s: slice starts beyond end of the disk: rejecting it\n",
497 size = lp->d_secperunit - offset;
498 if (size >= dp->dp_size)
502 "%s: slice extends beyond end of disk: truncating from %lu to %lu sectors\n",
503 sname, (u_long)dp->dp_size, size);
504 sp->ds_offset = offset;
506 sp->ds_type = dp->dp_typ;
508 /* Fake FreeBSD(98). */
509 if (sp->ds_type == DOSPTYP_386BSD)
513 lp->d_subtype |= (lp->d_subtype & 3) | dospart | DSTYPE_INDOSPART;
520 alpha_fix_srm_checksum(bp)
527 p = (u_int64_t *) bp->b_data;
529 for (i = 0; i < 63; i++)