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 1.2 2003/06/17 04:28:41 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/malloc.h>
56 #include <sys/syslog.h>
58 #define TRACE(str) do { if (dsi_debug) printf str; } while (0)
60 static volatile u_char dsi_debug;
62 static struct dos_partition historical_bogus_partition_table[NDOSPART] = {
63 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
64 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
65 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
66 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, },
69 static int check_part __P((char *sname, struct dos_partition *dp,
70 u_long offset, int nsectors, int ntracks,
72 static void mbr_extended __P((dev_t dev, struct disklabel *lp,
73 struct diskslices *ssp, u_long ext_offset,
74 u_long ext_size, u_long base_ext_offset,
75 int nsectors, int ntracks, u_long mbr_offset,
77 static int mbr_setslice __P((char *sname, struct disklabel *lp,
78 struct diskslice *sp, struct dos_partition *dp,
82 check_part(sname, dp, offset, nsectors, ntracks, mbr_offset )
84 struct dos_partition *dp;
101 secpercyl = (u_long)nsectors * ntracks;
102 chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect);
103 chs_ssect = DPSECT(dp->dp_ssect);
104 ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl
106 ssector1 = offset + dp->dp_start;
109 * If ssector1 is on a cylinder >= 1024, then ssector can't be right.
110 * Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct
111 * apart from the cylinder being reduced modulo 1024. Always allow
114 if ((ssector < ssector1
115 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1
118 && (ssector1 - ssector) % (1024 * secpercyl) == 0)))
119 || (dp->dp_scyl == 255 && dp->dp_shd == 255
120 && dp->dp_ssect == 255)) {
121 TRACE(("%s: C/H/S start %d/%d/%d, start %lu: allow\n",
122 sname, chs_scyl, dp->dp_shd, chs_ssect, ssector1));
126 chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect);
127 chs_esect = DPSECT(dp->dp_esect);
128 esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl
130 esector1 = ssector1 + dp->dp_size - 1;
132 /* Allow certain bogus C/H/S values for esector, as above. */
133 if ((esector < esector1
134 && ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1
137 && (esector1 - esector) % (1024 * secpercyl) == 0)))
138 || (dp->dp_ecyl == 255 && dp->dp_ehd == 255
139 && dp->dp_esect == 255)) {
140 TRACE(("%s: C/H/S end %d/%d/%d, end %lu: allow\n",
141 sname, chs_ecyl, dp->dp_ehd, chs_esect, esector1));
145 error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL;
147 printf("%s: type 0x%x, start %lu, end = %lu, size %lu %s\n",
148 sname, dp->dp_typ, ssector1, esector1,
149 (u_long)dp->dp_size, error ? "" : ": OK");
150 if (ssector != ssector1 && bootverbose)
151 printf("%s: C/H/S start %d/%d/%d (%lu) != start %lu: invalid\n",
152 sname, chs_scyl, dp->dp_shd, chs_ssect,
154 if (esector != esector1 && bootverbose)
155 printf("%s: C/H/S end %d/%d/%d (%lu) != end %lu: invalid\n",
156 sname, chs_ecyl, dp->dp_ehd, chs_esect,
162 dsinit(dev, lp, sspp)
164 struct disklabel *lp;
165 struct diskslices **sspp;
170 struct dos_partition *dp;
171 struct dos_partition *dp0;
172 struct dos_partition dpcopy[NDOSPART];
181 struct diskslice *sp;
182 struct diskslices *ssp;
184 mbr_offset = DOSBBSECTOR;
186 /* Read master boot record. */
187 bp = geteblk((int)lp->d_secsize);
188 bp->b_dev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
189 bp->b_blkno = mbr_offset;
190 bp->b_bcount = lp->d_secsize;
191 bp->b_flags |= B_READ;
193 if (biowait(bp) != 0) {
194 diskerr(bp, "reading primary partition table: error",
195 LOG_PRINTF, 0, (struct disklabel *)NULL);
201 /* Weakly verify it. */
203 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname);
204 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
206 printf("%s: invalid primary partition table: no magic\n",
212 /* Make a copy of the partition table to avoid alignment problems. */
213 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
217 /* Check for "Ontrack Diskmanager". */
218 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
219 if (dp->dp_typ == DOSPTYP_ONTRACK) {
222 "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname);
223 bp->b_flags |= B_INVAL | B_AGE;
230 if (bcmp(dp0, historical_bogus_partition_table,
231 sizeof historical_bogus_partition_table) == 0) {
232 TRACE(("%s: invalid primary partition table: historical\n",
238 /* Guess the geometry. */
241 * Perhaps skip entries with 0 size.
242 * Perhaps only look at entries of type DOSPTYP_386BSD.
247 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
252 ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1;
253 if (max_ncyls < ncyls)
255 nsectors = DPSECT(dp->dp_esect);
256 if (max_nsectors < nsectors)
257 max_nsectors = nsectors;
258 ntracks = dp->dp_ehd + 1;
259 if (max_ntracks < ntracks)
260 max_ntracks = ntracks;
264 * Check that we have guessed the geometry right by checking the
270 * Check for overlaps.
271 * Check against d_secperunit if the latter is reliable.
274 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
275 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
276 && dp->dp_start == 0 && dp->dp_size == 0)
278 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
282 * Temporarily ignore errors from this check. We could
283 * simplify things by accepting the table eariler if we
284 * always ignore errors here. Perhaps we should always
285 * accept the table if the magic is right but not let
286 * bad entries affect the geometry.
288 check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks,
295 * Accept the DOS partition table.
296 * First adjust the label (we have been careful not to change it
297 * before we can guarantee success).
299 secpercyl = (u_long)max_nsectors * max_ntracks;
300 if (secpercyl != 0) {
305 lp->d_nsectors = max_nsectors;
306 lp->d_ntracks = max_ntracks;
307 lp->d_secpercyl = secpercyl;
309 * Temporarily, don't even consider adjusting the drive's
310 * size, since the adjusted size may exceed the hardware's
311 * addressing capabilities. The adjustment helped mainly
312 * for ancient MFM drives with > 1024 cylinders, but now
313 * breaks at least IDE drives with 63*16*65536 sectors if
314 * they are controlled by the wd driver in CHS mode.
317 secperunit = secpercyl * max_ncyls;
318 if (lp->d_secperunit < secperunit)
319 lp->d_secperunit = secperunit;
321 lp->d_ncylinders = lp->d_secperunit / secpercyl;
325 * We are passed a pointer to a suitably initialized minimal
326 * slices "struct" with no dangling pointers in it. Replace it
327 * by a maximal one. This usually oversizes the "struct", but
328 * enlarging it while searching for logical drives would be
331 free(*sspp, M_DEVBUF);
332 ssp = dsmakeslicestruct(MAX_SLICES, lp);
335 /* Initialize normal slices. */
336 sp = &ssp->dss_slices[BASE_SLICE];
337 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) {
338 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
340 (void)mbr_setslice(sname, lp, sp, dp, mbr_offset);
342 ssp->dss_nslices = BASE_SLICE + NDOSPART;
344 /* Handle extended partitions. */
346 for (dospart = 0; dospart < NDOSPART; dospart++, sp++)
347 if (sp->ds_type == DOSPTYP_EXTENDED ||
348 sp->ds_type == DOSPTYP_EXTENDEDX)
349 mbr_extended(bp->b_dev, lp, ssp,
350 sp->ds_offset, sp->ds_size, sp->ds_offset,
351 max_nsectors, max_ntracks, mbr_offset, 1);
354 * mbr_extended() abuses ssp->dss_nslices for the number of slices
355 * that would be found if there were no limit on the number of slices
356 * in *ssp. Cut it back now.
358 if (ssp->dss_nslices > MAX_SLICES)
359 ssp->dss_nslices = MAX_SLICES;
362 bp->b_flags |= B_INVAL | B_AGE;
370 mbr_extended(dev, lp, ssp, ext_offset, ext_size, base_ext_offset, nsectors,
371 ntracks, mbr_offset, level)
373 struct disklabel *lp;
374 struct diskslices *ssp;
377 u_long base_ext_offset;
386 struct dos_partition *dp;
387 struct dos_partition dpcopy[NDOSPART];
388 u_long ext_offsets[NDOSPART];
389 u_long ext_sizes[NDOSPART];
393 struct diskslice *sp;
397 "%s: excessive recursion in search for slices; aborting search\n",
402 /* Read extended boot record. */
403 bp = geteblk((int)lp->d_secsize);
405 bp->b_blkno = ext_offset;
406 bp->b_bcount = lp->d_secsize;
407 bp->b_flags |= B_READ;
409 if (biowait(bp) != 0) {
410 diskerr(bp, "reading extended partition table: error",
411 LOG_PRINTF, 0, (struct disklabel *)NULL);
416 /* Weakly verify it. */
418 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
419 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART,
422 printf("%s: invalid extended partition table: no magic\n",
427 /* Make a copy of the partition table to avoid alignment problems. */
428 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
430 slice = ssp->dss_nslices;
431 for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART;
433 ext_sizes[dospart] = 0;
434 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
435 && dp->dp_start == 0 && dp->dp_size == 0)
437 if (dp->dp_typ == DOSPTYP_EXTENDED ||
438 dp->dp_typ == DOSPTYP_EXTENDEDX) {
441 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE,
443 snprintf(buf, sizeof(buf), "%s", sname);
444 if (strlen(buf) < sizeof buf - 11)
445 strcat(buf, "<extended>");
446 check_part(buf, dp, base_ext_offset, nsectors,
447 ntracks, mbr_offset);
448 ext_offsets[dospart] = base_ext_offset + dp->dp_start;
449 ext_sizes[dospart] = dp->dp_size;
451 sname = dsname(dev, dkunit(dev), slice, RAW_PART,
453 check_part(sname, dp, ext_offset, nsectors, ntracks,
455 if (slice >= MAX_SLICES) {
456 printf("%s: too many slices\n", sname);
460 sp = &ssp->dss_slices[slice];
461 if (mbr_setslice(sname, lp, sp, dp, ext_offset) != 0)
466 ssp->dss_nslices = slice;
468 /* If we found any more slices, recursively find all the subslices. */
469 for (dospart = 0; dospart < NDOSPART; dospart++)
470 if (ext_sizes[dospart] != 0)
471 mbr_extended(dev, lp, ssp, ext_offsets[dospart],
472 ext_sizes[dospart], base_ext_offset,
473 nsectors, ntracks, mbr_offset, ++level);
476 bp->b_flags |= B_INVAL | B_AGE;
481 mbr_setslice(sname, lp, sp, dp, br_offset)
483 struct disklabel *lp;
484 struct diskslice *sp;
485 struct dos_partition *dp;
491 offset = br_offset + dp->dp_start;
492 if (offset > lp->d_secperunit || offset < br_offset) {
494 "%s: slice starts beyond end of the disk: rejecting it\n",
498 size = lp->d_secperunit - offset;
499 if (size >= dp->dp_size)
503 "%s: slice extends beyond end of disk: truncating from %lu to %lu sectors\n",
504 sname, (u_long)dp->dp_size, size);
505 sp->ds_offset = offset;
507 sp->ds_type = dp->dp_typ;
509 /* Fake FreeBSD(98). */
510 if (sp->ds_type == DOSPTYP_386BSD)
514 lp->d_subtype |= (lp->d_subtype & 3) | dospart | DSTYPE_INDOSPART;
521 alpha_fix_srm_checksum(bp)
528 p = (u_int64_t *) bp->b_data;
530 for (i = 0; i < 63; i++)