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 1.5 2003/11/10 06:12:13 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(sname, dp, offset, nsectors, ntracks, mbr_offset )
86 struct dos_partition *dp;
103 secpercyl = (u_long)nsectors * ntracks;
104 chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect);
105 chs_ssect = DPSECT(dp->dp_ssect);
106 ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl
108 ssector1 = offset + dp->dp_start;
111 * If ssector1 is on a cylinder >= 1024, then ssector can't be right.
112 * Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct
113 * apart from the cylinder being reduced modulo 1024. Always allow
116 if ((ssector < ssector1
117 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1
120 && (ssector1 - ssector) % (1024 * secpercyl) == 0)))
121 || (dp->dp_scyl == 255 && dp->dp_shd == 255
122 && dp->dp_ssect == 255)) {
123 TRACE(("%s: C/H/S start %d/%d/%d, start %lu: allow\n",
124 sname, chs_scyl, dp->dp_shd, chs_ssect, ssector1));
128 chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect);
129 chs_esect = DPSECT(dp->dp_esect);
130 esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl
132 esector1 = ssector1 + dp->dp_size - 1;
134 /* Allow certain bogus C/H/S values for esector, as above. */
135 if ((esector < esector1
136 && ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1
139 && (esector1 - esector) % (1024 * secpercyl) == 0)))
140 || (dp->dp_ecyl == 255 && dp->dp_ehd == 255
141 && dp->dp_esect == 255)) {
142 TRACE(("%s: C/H/S end %d/%d/%d, end %lu: allow\n",
143 sname, chs_ecyl, dp->dp_ehd, chs_esect, esector1));
147 error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL;
149 printf("%s: type 0x%x, start %lu, end = %lu, size %lu %s\n",
150 sname, dp->dp_typ, ssector1, esector1,
151 (u_long)dp->dp_size, error ? "" : ": OK");
152 if (ssector != ssector1 && bootverbose)
153 printf("%s: C/H/S start %d/%d/%d (%lu) != start %lu: invalid\n",
154 sname, chs_scyl, dp->dp_shd, chs_ssect,
156 if (esector != esector1 && bootverbose)
157 printf("%s: C/H/S end %d/%d/%d (%lu) != end %lu: invalid\n",
158 sname, chs_ecyl, dp->dp_ehd, chs_esect,
164 dsinit(dev, lp, sspp)
166 struct disklabel *lp;
167 struct diskslices **sspp;
172 struct dos_partition *dp;
173 struct dos_partition *dp0;
174 struct dos_partition dpcopy[NDOSPART];
183 struct diskslice *sp;
184 struct diskslices *ssp;
186 mbr_offset = DOSBBSECTOR;
188 /* Read master boot record. */
189 bp = geteblk((int)lp->d_secsize);
190 bp->b_dev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
191 bp->b_blkno = mbr_offset;
192 bp->b_bcount = lp->d_secsize;
193 bp->b_flags |= B_READ;
195 if (biowait(bp) != 0) {
196 diskerr(bp, "reading primary partition table: error",
197 LOG_PRINTF, 0, (struct disklabel *)NULL);
203 /* Weakly verify it. */
205 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname);
206 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
208 printf("%s: invalid primary partition table: no magic\n",
214 /* Make a copy of the partition table to avoid alignment problems. */
215 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
219 /* Check for "Ontrack Diskmanager". */
220 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
221 if (dp->dp_typ == DOSPTYP_ONTRACK) {
224 "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname);
225 bp->b_flags |= B_INVAL | B_AGE;
232 if (bcmp(dp0, historical_bogus_partition_table,
233 sizeof historical_bogus_partition_table) == 0) {
234 TRACE(("%s: invalid primary partition table: historical\n",
240 /* Guess the geometry. */
243 * Perhaps skip entries with 0 size.
244 * Perhaps only look at entries of type DOSPTYP_386BSD.
249 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
254 ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1;
255 if (max_ncyls < ncyls)
257 nsectors = DPSECT(dp->dp_esect);
258 if (max_nsectors < nsectors)
259 max_nsectors = nsectors;
260 ntracks = dp->dp_ehd + 1;
261 if (max_ntracks < ntracks)
262 max_ntracks = ntracks;
266 * Check that we have guessed the geometry right by checking the
272 * Check for overlaps.
273 * Check against d_secperunit if the latter is reliable.
276 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
277 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
278 && dp->dp_start == 0 && dp->dp_size == 0)
280 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
284 * Temporarily ignore errors from this check. We could
285 * simplify things by accepting the table eariler if we
286 * always ignore errors here. Perhaps we should always
287 * accept the table if the magic is right but not let
288 * bad entries affect the geometry.
290 check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks,
297 * Accept the DOS partition table.
298 * First adjust the label (we have been careful not to change it
299 * before we can guarantee success).
301 secpercyl = (u_long)max_nsectors * max_ntracks;
302 if (secpercyl != 0) {
307 lp->d_nsectors = max_nsectors;
308 lp->d_ntracks = max_ntracks;
309 lp->d_secpercyl = secpercyl;
311 * Temporarily, don't even consider adjusting the drive's
312 * size, since the adjusted size may exceed the hardware's
313 * addressing capabilities. The adjustment helped mainly
314 * for ancient MFM drives with > 1024 cylinders, but now
315 * breaks at least IDE drives with 63*16*65536 sectors if
316 * they are controlled by the wd driver in CHS mode.
319 secperunit = secpercyl * max_ncyls;
320 if (lp->d_secperunit < secperunit)
321 lp->d_secperunit = secperunit;
323 lp->d_ncylinders = lp->d_secperunit / secpercyl;
327 * We are passed a pointer to a suitably initialized minimal
328 * slices "struct" with no dangling pointers in it. Replace it
329 * by a maximal one. This usually oversizes the "struct", but
330 * enlarging it while searching for logical drives would be
333 free(*sspp, M_DEVBUF);
334 ssp = dsmakeslicestruct(MAX_SLICES, lp);
337 /* Initialize normal slices. */
338 sp = &ssp->dss_slices[BASE_SLICE];
339 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) {
340 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
342 (void)mbr_setslice(sname, lp, sp, dp, mbr_offset);
344 ssp->dss_nslices = BASE_SLICE + NDOSPART;
346 /* Handle extended partitions. */
348 for (dospart = 0; dospart < NDOSPART; dospart++, sp++)
349 if (sp->ds_type == DOSPTYP_EXTENDED ||
350 sp->ds_type == DOSPTYP_EXTENDEDX)
351 mbr_extended(bp->b_dev, lp, ssp,
352 sp->ds_offset, sp->ds_size, sp->ds_offset,
353 max_nsectors, max_ntracks, mbr_offset, 1);
356 * mbr_extended() abuses ssp->dss_nslices for the number of slices
357 * that would be found if there were no limit on the number of slices
358 * in *ssp. Cut it back now.
360 if (ssp->dss_nslices > MAX_SLICES)
361 ssp->dss_nslices = MAX_SLICES;
364 bp->b_flags |= B_INVAL | B_AGE;
372 mbr_extended(dev, lp, ssp, ext_offset, ext_size, base_ext_offset, nsectors,
373 ntracks, mbr_offset, level)
375 struct disklabel *lp;
376 struct diskslices *ssp;
379 u_long base_ext_offset;
388 struct dos_partition *dp;
389 struct dos_partition dpcopy[NDOSPART];
390 u_long ext_offsets[NDOSPART];
391 u_long ext_sizes[NDOSPART];
395 struct diskslice *sp;
399 "%s: excessive recursion in search for slices; aborting search\n",
404 /* Read extended boot record. */
405 bp = geteblk((int)lp->d_secsize);
407 bp->b_blkno = ext_offset;
408 bp->b_bcount = lp->d_secsize;
409 bp->b_flags |= B_READ;
411 if (biowait(bp) != 0) {
412 diskerr(bp, "reading extended partition table: error",
413 LOG_PRINTF, 0, (struct disklabel *)NULL);
418 /* Weakly verify it. */
420 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
421 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART,
424 printf("%s: invalid extended partition table: no magic\n",
429 /* Make a copy of the partition table to avoid alignment problems. */
430 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
432 slice = ssp->dss_nslices;
433 for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART;
435 ext_sizes[dospart] = 0;
436 if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
437 && dp->dp_start == 0 && dp->dp_size == 0)
439 if (dp->dp_typ == DOSPTYP_EXTENDED ||
440 dp->dp_typ == DOSPTYP_EXTENDEDX) {
443 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE,
445 snprintf(buf, sizeof(buf), "%s", sname);
446 if (strlen(buf) < sizeof buf - 11)
447 strcat(buf, "<extended>");
448 check_part(buf, dp, base_ext_offset, nsectors,
449 ntracks, mbr_offset);
450 ext_offsets[dospart] = base_ext_offset + dp->dp_start;
451 ext_sizes[dospart] = dp->dp_size;
453 sname = dsname(dev, dkunit(dev), slice, RAW_PART,
455 check_part(sname, dp, ext_offset, nsectors, ntracks,
457 if (slice >= MAX_SLICES) {
458 printf("%s: too many slices\n", sname);
462 sp = &ssp->dss_slices[slice];
463 if (mbr_setslice(sname, lp, sp, dp, ext_offset) != 0)
468 ssp->dss_nslices = slice;
470 /* If we found any more slices, recursively find all the subslices. */
471 for (dospart = 0; dospart < NDOSPART; dospart++)
472 if (ext_sizes[dospart] != 0)
473 mbr_extended(dev, lp, ssp, ext_offsets[dospart],
474 ext_sizes[dospart], base_ext_offset,
475 nsectors, ntracks, mbr_offset, ++level);
478 bp->b_flags |= B_INVAL | B_AGE;
483 mbr_setslice(sname, lp, sp, dp, br_offset)
485 struct disklabel *lp;
486 struct diskslice *sp;
487 struct dos_partition *dp;
493 offset = br_offset + dp->dp_start;
494 if (offset > lp->d_secperunit || offset < br_offset) {
496 "%s: slice starts beyond end of the disk: rejecting it\n",
500 size = lp->d_secperunit - offset;
501 if (size >= dp->dp_size)
505 "%s: slice extends beyond end of disk: truncating from %lu to %lu sectors\n",
506 sname, (u_long)dp->dp_size, size);
507 sp->ds_offset = offset;
509 sp->ds_type = dp->dp_typ;
511 /* Fake FreeBSD(98). */
512 if (sp->ds_type == DOSPTYP_386BSD)
516 lp->d_subtype |= (lp->d_subtype & 3) | dospart | DSTYPE_INDOSPART;
523 alpha_fix_srm_checksum(bp)
530 p = (u_int64_t *) bp->b_data;
532 for (i = 0; i < 63; i++)