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 $
39 * $DragonFly: src/sys/kern/subr_diskmbr.c,v 1.8 2004/06/02 19:31:02 dillon Exp $
42 #include <sys/param.h>
43 #include <sys/systm.h>
48 #define dsinit atcompat_dsinit
50 #include <sys/disklabel.h>
51 #define DOSPTYP_EXTENDED 5
52 #define DOSPTYP_EXTENDEDX 15
53 #define DOSPTYP_ONTRACK 84
54 #include <sys/diskslice.h>
55 #include <sys/diskmbr.h>
56 #include <sys/malloc.h>
57 #include <sys/syslog.h>
58 #include <sys/device.h>
60 #define TRACE(str) do { if (dsi_debug) printf str; } while (0)
62 static volatile u_char dsi_debug;
64 static struct dos_partition historical_bogus_partition_table[NDOSPART] = {
65 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
66 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
67 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
68 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, },
71 static int check_part (char *sname, struct dos_partition *dp,
72 u_long offset, int nsectors, int ntracks,
74 static void mbr_extended (dev_t dev, struct disklabel *lp,
75 struct diskslices *ssp, u_long ext_offset,
76 u_long ext_size, u_long base_ext_offset,
77 int nsectors, int ntracks, u_long mbr_offset,
79 static int mbr_setslice (char *sname, struct disklabel *lp,
80 struct diskslice *sp, struct dos_partition *dp,
84 check_part(char *sname, struct dos_partition *dp, u_long offset,
85 int nsectors, int ntracks, u_long mbr_offset)
98 secpercyl = (u_long)nsectors * ntracks;
99 chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect);
100 chs_ssect = DPSECT(dp->dp_ssect);
101 ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl
103 ssector1 = offset + dp->dp_start;
106 * If ssector1 is on a cylinder >= 1024, then ssector can't be right.
107 * Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct
108 * apart from the cylinder being reduced modulo 1024. Always allow
111 if ((ssector < ssector1
112 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1
115 && (ssector1 - ssector) % (1024 * secpercyl) == 0)))
116 || (dp->dp_scyl == 255 && dp->dp_shd == 255
117 && dp->dp_ssect == 255)) {
118 TRACE(("%s: C/H/S start %d/%d/%d, start %lu: allow\n",
119 sname, chs_scyl, dp->dp_shd, chs_ssect, ssector1));
123 chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect);
124 chs_esect = DPSECT(dp->dp_esect);
125 esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl
127 esector1 = ssector1 + dp->dp_size - 1;
129 /* Allow certain bogus C/H/S values for esector, as above. */
130 if ((esector < esector1
131 && ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1
134 && (esector1 - esector) % (1024 * secpercyl) == 0)))
135 || (dp->dp_ecyl == 255 && dp->dp_ehd == 255
136 && dp->dp_esect == 255)) {
137 TRACE(("%s: C/H/S end %d/%d/%d, end %lu: allow\n",
138 sname, chs_ecyl, dp->dp_ehd, chs_esect, esector1));
142 error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL;
144 printf("%s: type 0x%x, start %lu, end = %lu, size %lu %s\n",
145 sname, dp->dp_typ, ssector1, esector1,
146 (u_long)dp->dp_size, error ? "" : ": OK");
147 if (ssector != ssector1 && bootverbose)
148 printf("%s: C/H/S start %d/%d/%d (%lu) != start %lu: invalid\n",
149 sname, chs_scyl, dp->dp_shd, chs_ssect,
151 if (esector != esector1 && bootverbose)
152 printf("%s: C/H/S end %d/%d/%d (%lu) != end %lu: invalid\n",
153 sname, chs_ecyl, dp->dp_ehd, chs_esect,
159 dsinit(dev_t dev, struct disklabel *lp, struct diskslices **sspp)
164 struct dos_partition *dp;
165 struct dos_partition *dp0;
166 struct dos_partition dpcopy[NDOSPART];
175 struct diskslice *sp;
176 struct diskslices *ssp;
179 mbr_offset = DOSBBSECTOR;
181 /* Read master boot record. */
182 wdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
183 bp = geteblk((int)lp->d_secsize);
185 bp->b_blkno = mbr_offset;
186 bp->b_bcount = lp->d_secsize;
187 bp->b_flags |= B_READ;
189 if (biowait(bp) != 0) {
190 diskerr(bp, wdev, "reading primary partition table: error",
191 LOG_PRINTF, 0, (struct disklabel *)NULL);
197 /* Weakly verify it. */
199 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname);
200 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
202 printf("%s: invalid primary partition table: no magic\n",
208 /* Make a copy of the partition table to avoid alignment problems. */
209 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
213 /* Check for "Ontrack Diskmanager". */
214 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
215 if (dp->dp_typ == DOSPTYP_ONTRACK) {
218 "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname);
219 bp->b_flags |= B_INVAL | B_AGE;
226 if (bcmp(dp0, historical_bogus_partition_table,
227 sizeof historical_bogus_partition_table) == 0) {
228 TRACE(("%s: invalid primary partition table: historical\n",
234 /* Guess the geometry. */
237 * Perhaps skip entries with 0 size.
238 * Perhaps only look at entries of type DOSPTYP_386BSD.
243 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
248 ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1;
249 if (max_ncyls < ncyls)
251 nsectors = DPSECT(dp->dp_esect);
252 if (max_nsectors < nsectors)
253 max_nsectors = nsectors;
254 ntracks = dp->dp_ehd + 1;
255 if (max_ntracks < ntracks)
256 max_ntracks = ntracks;
260 * Check that we have guessed the geometry right by checking the
266 * Check for overlaps.
267 * Check against d_secperunit if the latter is reliable.
270 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
271 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
272 && dp->dp_start == 0 && dp->dp_size == 0)
274 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
278 * Temporarily ignore errors from this check. We could
279 * simplify things by accepting the table eariler if we
280 * always ignore errors here. Perhaps we should always
281 * accept the table if the magic is right but not let
282 * bad entries affect the geometry.
284 check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks,
291 * Accept the DOS partition table.
292 * First adjust the label (we have been careful not to change it
293 * before we can guarantee success).
295 secpercyl = (u_long)max_nsectors * max_ntracks;
296 if (secpercyl != 0) {
301 lp->d_nsectors = max_nsectors;
302 lp->d_ntracks = max_ntracks;
303 lp->d_secpercyl = secpercyl;
305 * Temporarily, don't even consider adjusting the drive's
306 * size, since the adjusted size may exceed the hardware's
307 * addressing capabilities. The adjustment helped mainly
308 * for ancient MFM drives with > 1024 cylinders, but now
309 * breaks at least IDE drives with 63*16*65536 sectors if
310 * they are controlled by the wd driver in CHS mode.
313 secperunit = secpercyl * max_ncyls;
314 if (lp->d_secperunit < secperunit)
315 lp->d_secperunit = secperunit;
317 lp->d_ncylinders = lp->d_secperunit / secpercyl;
321 * We are passed a pointer to a suitably initialized minimal
322 * slices "struct" with no dangling pointers in it. Replace it
323 * by a maximal one. This usually oversizes the "struct", but
324 * enlarging it while searching for logical drives would be
327 free(*sspp, M_DEVBUF);
328 ssp = dsmakeslicestruct(MAX_SLICES, lp);
331 /* Initialize normal slices. */
332 sp = &ssp->dss_slices[BASE_SLICE];
333 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) {
334 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
336 (void)mbr_setslice(sname, lp, sp, dp, mbr_offset);
338 ssp->dss_nslices = BASE_SLICE + NDOSPART;
340 /* Handle extended partitions. */
342 for (dospart = 0; dospart < NDOSPART; dospart++, sp++) {
343 if (sp->ds_type == DOSPTYP_EXTENDED ||
344 sp->ds_type == DOSPTYP_EXTENDEDX) {
345 mbr_extended(wdev, lp, ssp,
346 sp->ds_offset, sp->ds_size, sp->ds_offset,
347 max_nsectors, max_ntracks, mbr_offset, 1);
352 * mbr_extended() abuses ssp->dss_nslices for the number of slices
353 * that would be found if there were no limit on the number of slices
354 * in *ssp. Cut it back now.
356 if (ssp->dss_nslices > MAX_SLICES)
357 ssp->dss_nslices = MAX_SLICES;
360 bp->b_flags |= B_INVAL | B_AGE;
368 mbr_extended(dev_t dev, struct disklabel *lp, struct diskslices *ssp,
369 u_long ext_offset, u_long ext_size, u_long base_ext_offset,
370 int nsectors, int ntracks, u_long mbr_offset, int level)
375 struct dos_partition *dp;
376 struct dos_partition dpcopy[NDOSPART];
377 u_long ext_offsets[NDOSPART];
378 u_long ext_sizes[NDOSPART];
382 struct diskslice *sp;
386 "%s: excessive recursion in search for slices; aborting search\n",
391 /* Read extended boot record. */
392 bp = geteblk((int)lp->d_secsize);
394 bp->b_blkno = ext_offset;
395 bp->b_bcount = lp->d_secsize;
396 bp->b_flags |= B_READ;
398 if (biowait(bp) != 0) {
399 diskerr(bp, dev, "reading extended partition table: error",
400 LOG_PRINTF, 0, (struct disklabel *)NULL);
405 /* Weakly verify it. */
407 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
408 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART,
411 printf("%s: invalid extended partition table: no magic\n",
416 /* Make a copy of the partition table to avoid alignment problems. */
417 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
419 slice = ssp->dss_nslices;
420 for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART;
422 ext_sizes[dospart] = 0;
423 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
424 && dp->dp_start == 0 && dp->dp_size == 0)
426 if (dp->dp_typ == DOSPTYP_EXTENDED ||
427 dp->dp_typ == DOSPTYP_EXTENDEDX) {
430 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE,
432 snprintf(buf, sizeof(buf), "%s", sname);
433 if (strlen(buf) < sizeof buf - 11)
434 strcat(buf, "<extended>");
435 check_part(buf, dp, base_ext_offset, nsectors,
436 ntracks, mbr_offset);
437 ext_offsets[dospart] = base_ext_offset + dp->dp_start;
438 ext_sizes[dospart] = dp->dp_size;
440 sname = dsname(dev, dkunit(dev), slice, RAW_PART,
442 check_part(sname, dp, ext_offset, nsectors, ntracks,
444 if (slice >= MAX_SLICES) {
445 printf("%s: too many slices\n", sname);
449 sp = &ssp->dss_slices[slice];
450 if (mbr_setslice(sname, lp, sp, dp, ext_offset) != 0)
455 ssp->dss_nslices = slice;
457 /* If we found any more slices, recursively find all the subslices. */
458 for (dospart = 0; dospart < NDOSPART; dospart++) {
459 if (ext_sizes[dospart] != 0) {
460 mbr_extended(dev, lp, ssp, ext_offsets[dospart],
461 ext_sizes[dospart], base_ext_offset,
462 nsectors, ntracks, mbr_offset, ++level);
467 bp->b_flags |= B_INVAL | B_AGE;
472 mbr_setslice(char *sname, struct disklabel *lp, struct diskslice *sp,
473 struct dos_partition *dp, u_long br_offset)
478 offset = br_offset + dp->dp_start;
479 if (offset > lp->d_secperunit || offset < br_offset) {
481 "%s: slice starts beyond end of the disk: rejecting it\n",
485 size = lp->d_secperunit - offset;
486 if (size >= dp->dp_size)
490 "%s: slice extends beyond end of disk: truncating from %lu to %lu sectors\n",
491 sname, (u_long)dp->dp_size, size);
492 sp->ds_offset = offset;
494 sp->ds_type = dp->dp_typ;
496 /* Fake FreeBSD(98). */
497 if (sp->ds_type == DOSPTYP_386BSD)
501 lp->d_subtype |= (lp->d_subtype & 3) | dospart | DSTYPE_INDOSPART;
508 alpha_fix_srm_checksum(struct buf *bp)
514 p = (u_int64_t *) bp->b_data;
516 for (i = 0; i < 63; i++)