__P() removal
[dragonfly.git] / sys / kern / subr_diskmbr.c
CommitLineData
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1/*-
2 * Copyright (c) 1994 Bruce D. Evans.
3 * All rights reserved.
4 *
5 * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
23 *
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
34 * SUCH DAMAGE.
35 *
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 $
402ed7e1 39 * $DragonFly: src/sys/kern/subr_diskmbr.c,v 1.4 2003/08/26 21:09:02 rob Exp $
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40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/buf.h>
45#include <sys/conf.h>
46#ifdef PC98
47#define PC98_ATCOMPAT
48#define dsinit atcompat_dsinit
49#endif
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>
335dda38 57#include <sys/device.h>
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58
59#define TRACE(str) do { if (dsi_debug) printf str; } while (0)
60
61static volatile u_char dsi_debug;
62
63static 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, },
68};
69
402ed7e1 70static int check_part (char *sname, struct dos_partition *dp,
984263bc 71 u_long offset, int nsectors, int ntracks,
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72 u_long mbr_offset);
73static void mbr_extended (dev_t dev, struct disklabel *lp,
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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,
402ed7e1
RG
77 int level);
78static int mbr_setslice (char *sname, struct disklabel *lp,
984263bc 79 struct diskslice *sp, struct dos_partition *dp,
402ed7e1 80 u_long br_offset);
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81
82static int
83check_part(sname, dp, offset, nsectors, ntracks, mbr_offset )
84 char *sname;
85 struct dos_partition *dp;
86 u_long offset;
87 int nsectors;
88 int ntracks;
89 u_long mbr_offset;
90{
91 int chs_ecyl;
92 int chs_esect;
93 int chs_scyl;
94 int chs_ssect;
95 int error;
96 u_long esector;
97 u_long esector1;
98 u_long secpercyl;
99 u_long ssector;
100 u_long ssector1;
101
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
106 + mbr_offset;
107 ssector1 = offset + dp->dp_start;
108
109 /*
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
113 * 1023/255/63.
114 */
115 if ((ssector < ssector1
116 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1
117 && chs_scyl == 1023)
118 || (secpercyl != 0
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));
124 ssector = ssector1;
125 }
126
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
130 + mbr_offset;
131 esector1 = ssector1 + dp->dp_size - 1;
132
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
136 && chs_ecyl == 1023)
137 || (secpercyl != 0
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));
143 esector = esector1;
144 }
145
146 error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL;
147 if (bootverbose)
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,
154 ssector, ssector1);
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,
158 esector, esector1);
159 return (error);
160}
161
162int
163dsinit(dev, lp, sspp)
164 dev_t dev;
165 struct disklabel *lp;
166 struct diskslices **sspp;
167{
168 struct buf *bp;
169 u_char *cp;
170 int dospart;
171 struct dos_partition *dp;
172 struct dos_partition *dp0;
173 struct dos_partition dpcopy[NDOSPART];
174 int error;
175 int max_ncyls;
176 int max_nsectors;
177 int max_ntracks;
178 u_long mbr_offset;
179 char partname[2];
180 u_long secpercyl;
181 char *sname;
182 struct diskslice *sp;
183 struct diskslices *ssp;
184
185 mbr_offset = DOSBBSECTOR;
186reread_mbr:
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;
193 BUF_STRATEGY(bp, 1);
194 if (biowait(bp) != 0) {
195 diskerr(bp, "reading primary partition table: error",
196 LOG_PRINTF, 0, (struct disklabel *)NULL);
197 printf("\n");
198 error = EIO;
199 goto done;
200 }
201
202 /* Weakly verify it. */
203 cp = bp->b_data;
204 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART, partname);
205 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
206 if (bootverbose)
207 printf("%s: invalid primary partition table: no magic\n",
208 sname);
209 error = EINVAL;
210 goto done;
211 }
212
213 /* Make a copy of the partition table to avoid alignment problems. */
214 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
215
216 dp0 = &dpcopy[0];
217
218 /* Check for "Ontrack Diskmanager". */
219 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
220 if (dp->dp_typ == DOSPTYP_ONTRACK) {
221 if (bootverbose)
222 printf(
223 "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname);
224 bp->b_flags |= B_INVAL | B_AGE;
225 brelse(bp);
226 mbr_offset = 63;
227 goto reread_mbr;
228 }
229 }
230
231 if (bcmp(dp0, historical_bogus_partition_table,
232 sizeof historical_bogus_partition_table) == 0) {
233 TRACE(("%s: invalid primary partition table: historical\n",
234 sname));
235 error = EINVAL;
236 goto done;
237 }
238
239 /* Guess the geometry. */
240 /*
241 * TODO:
242 * Perhaps skip entries with 0 size.
243 * Perhaps only look at entries of type DOSPTYP_386BSD.
244 */
245 max_ncyls = 0;
246 max_nsectors = 0;
247 max_ntracks = 0;
248 for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
249 int ncyls;
250 int nsectors;
251 int ntracks;
252
253 ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1;
254 if (max_ncyls < ncyls)
255 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;
262 }
263
264 /*
265 * Check that we have guessed the geometry right by checking the
266 * partition entries.
267 */
268 /*
269 * TODO:
270 * As above.
271 * Check for overlaps.
272 * Check against d_secperunit if the latter is reliable.
273 */
274 error = 0;
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)
278 continue;
279 sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart,
280 RAW_PART, partname);
281
282 /*
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.
288 */
289 check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks,
290 mbr_offset);
291 }
292 if (error != 0)
293 goto done;
294
295 /*
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).
299 */
300 secpercyl = (u_long)max_nsectors * max_ntracks;
301 if (secpercyl != 0) {
302#if 0
303 u_long secperunit;
304#endif
305
306 lp->d_nsectors = max_nsectors;
307 lp->d_ntracks = max_ntracks;
308 lp->d_secpercyl = secpercyl;
309 /*
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.
316 */
317#if 0
318 secperunit = secpercyl * max_ncyls;
319 if (lp->d_secperunit < secperunit)
320 lp->d_secperunit = secperunit;
321#endif
322 lp->d_ncylinders = lp->d_secperunit / secpercyl;
323 }
324
325 /*
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
330 * inconvenient.
331 */
332 free(*sspp, M_DEVBUF);
333 ssp = dsmakeslicestruct(MAX_SLICES, lp);
334 *sspp = ssp;
335
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,
340 RAW_PART, partname);
341 (void)mbr_setslice(sname, lp, sp, dp, mbr_offset);
342 }
343 ssp->dss_nslices = BASE_SLICE + NDOSPART;
344
345 /* Handle extended partitions. */
346 sp -= NDOSPART;
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);
353
354 /*
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.
358 */
359 if (ssp->dss_nslices > MAX_SLICES)
360 ssp->dss_nslices = MAX_SLICES;
361
362done:
363 bp->b_flags |= B_INVAL | B_AGE;
364 brelse(bp);
365 if (error == EINVAL)
366 error = 0;
367 return (error);
368}
369
370void
371mbr_extended(dev, lp, ssp, ext_offset, ext_size, base_ext_offset, nsectors,
372 ntracks, mbr_offset, level)
373 dev_t dev;
374 struct disklabel *lp;
375 struct diskslices *ssp;
376 u_long ext_offset;
377 u_long ext_size;
378 u_long base_ext_offset;
379 int nsectors;
380 int ntracks;
381 u_long mbr_offset;
382 int level;
383{
384 struct buf *bp;
385 u_char *cp;
386 int dospart;
387 struct dos_partition *dp;
388 struct dos_partition dpcopy[NDOSPART];
389 u_long ext_offsets[NDOSPART];
390 u_long ext_sizes[NDOSPART];
391 char partname[2];
392 int slice;
393 char *sname;
394 struct diskslice *sp;
395
396 if (level >= 16) {
397 printf(
398 "%s: excessive recursion in search for slices; aborting search\n",
399 devtoname(dev));
400 return;
401 }
402
403 /* Read extended boot record. */
404 bp = geteblk((int)lp->d_secsize);
405 bp->b_dev = dev;
406 bp->b_blkno = ext_offset;
407 bp->b_bcount = lp->d_secsize;
408 bp->b_flags |= B_READ;
409 BUF_STRATEGY(bp, 1);
410 if (biowait(bp) != 0) {
411 diskerr(bp, "reading extended partition table: error",
412 LOG_PRINTF, 0, (struct disklabel *)NULL);
413 printf("\n");
414 goto done;
415 }
416
417 /* Weakly verify it. */
418 cp = bp->b_data;
419 if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
420 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART,
421 partname);
422 if (bootverbose)
423 printf("%s: invalid extended partition table: no magic\n",
424 sname);
425 goto done;
426 }
427
428 /* Make a copy of the partition table to avoid alignment problems. */
429 memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy));
430
431 slice = ssp->dss_nslices;
432 for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART;
433 dospart++, dp++) {
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)
437 continue;
438 if (dp->dp_typ == DOSPTYP_EXTENDED ||
439 dp->dp_typ == DOSPTYP_EXTENDEDX) {
440 static char buf[32];
441
442 sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE,
443 RAW_PART, partname);
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;
451 } else {
452 sname = dsname(dev, dkunit(dev), slice, RAW_PART,
453 partname);
454 check_part(sname, dp, ext_offset, nsectors, ntracks,
455 mbr_offset);
456 if (slice >= MAX_SLICES) {
457 printf("%s: too many slices\n", sname);
458 slice++;
459 continue;
460 }
461 sp = &ssp->dss_slices[slice];
462 if (mbr_setslice(sname, lp, sp, dp, ext_offset) != 0)
463 continue;
464 slice++;
465 }
466 }
467 ssp->dss_nslices = slice;
468
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);
475
476done:
477 bp->b_flags |= B_INVAL | B_AGE;
478 brelse(bp);
479}
480
481static int
482mbr_setslice(sname, lp, sp, dp, br_offset)
483 char *sname;
484 struct disklabel *lp;
485 struct diskslice *sp;
486 struct dos_partition *dp;
487 u_long br_offset;
488{
489 u_long offset;
490 u_long size;
491
492 offset = br_offset + dp->dp_start;
493 if (offset > lp->d_secperunit || offset < br_offset) {
494 printf(
495 "%s: slice starts beyond end of the disk: rejecting it\n",
496 sname);
497 return (1);
498 }
499 size = lp->d_secperunit - offset;
500 if (size >= dp->dp_size)
501 size = dp->dp_size;
502 else
503 printf(
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;
507 sp->ds_size = size;
508 sp->ds_type = dp->dp_typ;
509#ifdef PC98_ATCOMPAT
510 /* Fake FreeBSD(98). */
511 if (sp->ds_type == DOSPTYP_386BSD)
512 sp->ds_type = 0x94;
513#endif
514#if 0
515 lp->d_subtype |= (lp->d_subtype & 3) | dospart | DSTYPE_INDOSPART;
516#endif
517 return (0);
518}
519
520#ifdef __alpha__
521void
522alpha_fix_srm_checksum(bp)
523 struct buf *bp;
524{
525 u_int64_t *p;
526 u_int64_t sum;
527 int i;
528
529 p = (u_int64_t *) bp->b_data;
530 sum = 0;
531 for (i = 0; i < 63; i++)
532 sum += p[i];
533 p[63] = sum;
534}
535#endif