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 1.3 2003/07/22 17:03:33 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>
57 #include <sys/device.h>
59 #define TRACE(str) do { if (dsi_debug) printf str; } while (0)
61 static volatile u_char dsi_debug;
63 static struct dos_partition historical_bogus_partition_table[NDOSPART] = {
64 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
65 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
66 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
67 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, },
70 static int check_part __P((char *sname, struct dos_partition *dp,
71 u_long offset, int nsectors, int ntracks,
73 static void mbr_extended __P((dev_t dev, struct disklabel *lp,
74 struct diskslices *ssp, u_long ext_offset,
75 u_long ext_size, u_long base_ext_offset,
76 int nsectors, int ntracks, u_long mbr_offset,
78 static int mbr_setslice __P((char *sname, struct disklabel *lp,
79 struct diskslice *sp, struct dos_partition *dp,
83 check_part(sname, dp, offset, nsectors, ntracks, mbr_offset )
85 struct dos_partition *dp;
102 secpercyl = (u_long)nsectors * ntracks;
103 chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect);
104 chs_ssect = DPSECT(dp->dp_ssect);
105 ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl
107 ssector1 = offset + dp->dp_start;
110 * If ssector1 is on a cylinder >= 1024, then ssector can't be right.
111 * Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct
112 * apart from the cylinder being reduced modulo 1024. Always allow
115 if ((ssector < ssector1
116 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1
119 && (ssector1 - ssector) % (1024 * secpercyl) == 0)))
120 || (dp->dp_scyl == 255 && dp->dp_shd == 255
121 && dp->dp_ssect == 255)) {
122 TRACE(("%s: C/H/S start %d/%d/%d, start %lu: allow\n",
123 sname, chs_scyl, dp->dp_shd, chs_ssect, ssector1));
127 chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect);
128 chs_esect = DPSECT(dp->dp_esect);
129 esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl
131 esector1 = ssector1 + dp->dp_size - 1;
133 /* Allow certain bogus C/H/S values for esector, as above. */
134 if ((esector < esector1
135 && ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1
138 && (esector1 - esector) % (1024 * secpercyl) == 0)))
139 || (dp->dp_ecyl == 255 && dp->dp_ehd == 255
140 && dp->dp_esect == 255)) {
141 TRACE(("%s: C/H/S end %d/%d/%d, end %lu: allow\n",
142 sname, chs_ecyl, dp->dp_ehd, chs_esect, esector1));
146 error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL;
148 printf("%s: type 0x%x, start %lu, end = %lu, size %lu %s\n",
149 sname, dp->dp_typ, ssector1, esector1,
150 (u_long)dp->dp_size, error ? "" : ": OK");
151 if (ssector != ssector1 && bootverbose)
152 printf("%s: C/H/S start %d/%d/%d (%lu) != start %lu: invalid\n",
153 sname, chs_scyl, dp->dp_shd, chs_ssect,
155 if (esector != esector1 && bootverbose)
156 printf("%s: C/H/S end %d/%d/%d (%lu) != end %lu: invalid\n",
157 sname, chs_ecyl, dp->dp_ehd, chs_esect,
163 dsinit(dev, lp, sspp)
165 struct disklabel *lp;
166 struct diskslices **sspp;
171 struct dos_partition *dp;
172 struct dos_partition *dp0;
173 struct dos_partition dpcopy[NDOSPART];
182 struct diskslice *sp;
183 struct diskslices *ssp;
185 mbr_offset = DOSBBSECTOR;
187 /* Read master boot record. */
188 bp = geteblk((int)lp->d_secsize);
189 bp->b_dev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
190 bp->b_blkno = mbr_offset;
191 bp->b_bcount = lp->d_secsize;
192 bp->b_flags |= B_READ;
194 if (biowait(bp) != 0) {
195 diskerr(bp, "reading primary partition table: error",
196 LOG_PRINTF, 0, (struct disklabel *)NULL);
202 /* Weakly verify it. */
204 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname);
205 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
207 printf("%s: invalid primary partition table: no magic\n",
213 /* Make a copy of the partition table to avoid alignment problems. */
214 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
218 /* Check for "Ontrack Diskmanager". */
219 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
220 if (dp->dp_typ == DOSPTYP_ONTRACK) {
223 "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname);
224 bp->b_flags |= B_INVAL | B_AGE;
231 if (bcmp(dp0, historical_bogus_partition_table,
232 sizeof historical_bogus_partition_table) == 0) {
233 TRACE(("%s: invalid primary partition table: historical\n",
239 /* Guess the geometry. */
242 * Perhaps skip entries with 0 size.
243 * Perhaps only look at entries of type DOSPTYP_386BSD.
248 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
253 ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1;
254 if (max_ncyls < ncyls)
256 nsectors = DPSECT(dp->dp_esect);
257 if (max_nsectors < nsectors)
258 max_nsectors = nsectors;
259 ntracks = dp->dp_ehd + 1;
260 if (max_ntracks < ntracks)
261 max_ntracks = ntracks;
265 * Check that we have guessed the geometry right by checking the
271 * Check for overlaps.
272 * Check against d_secperunit if the latter is reliable.
275 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
276 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
277 && dp->dp_start == 0 && dp->dp_size == 0)
279 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
283 * Temporarily ignore errors from this check. We could
284 * simplify things by accepting the table eariler if we
285 * always ignore errors here. Perhaps we should always
286 * accept the table if the magic is right but not let
287 * bad entries affect the geometry.
289 check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks,
296 * Accept the DOS partition table.
297 * First adjust the label (we have been careful not to change it
298 * before we can guarantee success).
300 secpercyl = (u_long)max_nsectors * max_ntracks;
301 if (secpercyl != 0) {
306 lp->d_nsectors = max_nsectors;
307 lp->d_ntracks = max_ntracks;
308 lp->d_secpercyl = secpercyl;
310 * Temporarily, don't even consider adjusting the drive's
311 * size, since the adjusted size may exceed the hardware's
312 * addressing capabilities. The adjustment helped mainly
313 * for ancient MFM drives with > 1024 cylinders, but now
314 * breaks at least IDE drives with 63*16*65536 sectors if
315 * they are controlled by the wd driver in CHS mode.
318 secperunit = secpercyl * max_ncyls;
319 if (lp->d_secperunit < secperunit)
320 lp->d_secperunit = secperunit;
322 lp->d_ncylinders = lp->d_secperunit / secpercyl;
326 * We are passed a pointer to a suitably initialized minimal
327 * slices "struct" with no dangling pointers in it. Replace it
328 * by a maximal one. This usually oversizes the "struct", but
329 * enlarging it while searching for logical drives would be
332 free(*sspp, M_DEVBUF);
333 ssp = dsmakeslicestruct(MAX_SLICES, lp);
336 /* Initialize normal slices. */
337 sp = &ssp->dss_slices[BASE_SLICE];
338 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) {
339 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
341 (void)mbr_setslice(sname, lp, sp, dp, mbr_offset);
343 ssp->dss_nslices = BASE_SLICE + NDOSPART;
345 /* Handle extended partitions. */
347 for (dospart = 0; dospart < NDOSPART; dospart++, sp++)
348 if (sp->ds_type == DOSPTYP_EXTENDED ||
349 sp->ds_type == DOSPTYP_EXTENDEDX)
350 mbr_extended(bp->b_dev, lp, ssp,
351 sp->ds_offset, sp->ds_size, sp->ds_offset,
352 max_nsectors, max_ntracks, mbr_offset, 1);
355 * mbr_extended() abuses ssp->dss_nslices for the number of slices
356 * that would be found if there were no limit on the number of slices
357 * in *ssp. Cut it back now.
359 if (ssp->dss_nslices > MAX_SLICES)
360 ssp->dss_nslices = MAX_SLICES;
363 bp->b_flags |= B_INVAL | B_AGE;
371 mbr_extended(dev, lp, ssp, ext_offset, ext_size, base_ext_offset, nsectors,
372 ntracks, mbr_offset, level)
374 struct disklabel *lp;
375 struct diskslices *ssp;
378 u_long base_ext_offset;
387 struct dos_partition *dp;
388 struct dos_partition dpcopy[NDOSPART];
389 u_long ext_offsets[NDOSPART];
390 u_long ext_sizes[NDOSPART];
394 struct diskslice *sp;
398 "%s: excessive recursion in search for slices; aborting search\n",
403 /* Read extended boot record. */
404 bp = geteblk((int)lp->d_secsize);
406 bp->b_blkno = ext_offset;
407 bp->b_bcount = lp->d_secsize;
408 bp->b_flags |= B_READ;
410 if (biowait(bp) != 0) {
411 diskerr(bp, "reading extended partition table: error",
412 LOG_PRINTF, 0, (struct disklabel *)NULL);
417 /* Weakly verify it. */
419 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
420 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART,
423 printf("%s: invalid extended partition table: no magic\n",
428 /* Make a copy of the partition table to avoid alignment problems. */
429 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
431 slice = ssp->dss_nslices;
432 for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART;
434 ext_sizes[dospart] = 0;
435 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
436 && dp->dp_start == 0 && dp->dp_size == 0)
438 if (dp->dp_typ == DOSPTYP_EXTENDED ||
439 dp->dp_typ == DOSPTYP_EXTENDEDX) {
442 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE,
444 snprintf(buf, sizeof(buf), "%s", sname);
445 if (strlen(buf) < sizeof buf - 11)
446 strcat(buf, "<extended>");
447 check_part(buf, dp, base_ext_offset, nsectors,
448 ntracks, mbr_offset);
449 ext_offsets[dospart] = base_ext_offset + dp->dp_start;
450 ext_sizes[dospart] = dp->dp_size;
452 sname = dsname(dev, dkunit(dev), slice, RAW_PART,
454 check_part(sname, dp, ext_offset, nsectors, ntracks,
456 if (slice >= MAX_SLICES) {
457 printf("%s: too many slices\n", sname);
461 sp = &ssp->dss_slices[slice];
462 if (mbr_setslice(sname, lp, sp, dp, ext_offset) != 0)
467 ssp->dss_nslices = slice;
469 /* If we found any more slices, recursively find all the subslices. */
470 for (dospart = 0; dospart < NDOSPART; dospart++)
471 if (ext_sizes[dospart] != 0)
472 mbr_extended(dev, lp, ssp, ext_offsets[dospart],
473 ext_sizes[dospart], base_ext_offset,
474 nsectors, ntracks, mbr_offset, ++level);
477 bp->b_flags |= B_INVAL | B_AGE;
482 mbr_setslice(sname, lp, sp, dp, br_offset)
484 struct disklabel *lp;
485 struct diskslice *sp;
486 struct dos_partition *dp;
492 offset = br_offset + dp->dp_start;
493 if (offset > lp->d_secperunit || offset < br_offset) {
495 "%s: slice starts beyond end of the disk: rejecting it\n",
499 size = lp->d_secperunit - offset;
500 if (size >= dp->dp_size)
504 "%s: slice extends beyond end of disk: truncating from %lu to %lu sectors\n",
505 sname, (u_long)dp->dp_size, size);
506 sp->ds_offset = offset;
508 sp->ds_type = dp->dp_typ;
510 /* Fake FreeBSD(98). */
511 if (sp->ds_type == DOSPTYP_386BSD)
515 lp->d_subtype |= (lp->d_subtype & 3) | dospart | DSTYPE_INDOSPART;
522 alpha_fix_srm_checksum(bp)
529 p = (u_int64_t *) bp->b_data;
531 for (i = 0; i < 63; i++)