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biosdisk.c (172927) biosdisk.c (172940)
1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 11 unchanged lines hidden (view full) ---

20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 11 unchanged lines hidden (view full) ---

20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/boot/i386/libi386/biosdisk.c 172927 2007-10-24 12:49:55Z jhb $");
28__FBSDID("$FreeBSD: head/sys/boot/i386/libi386/biosdisk.c 172940 2007-10-24 21:33:00Z jhb $");
29
30/*
31 * BIOS disk device handling.
32 *
33 * Ideas and algorithms from:
34 *
35 * - NetBSD libi386/biosdisk.c
36 * - FreeBSD biosboot/disk.c
37 *
38 */
39
40#include <stand.h>
41
42#include <sys/disklabel.h>
43#include <sys/diskmbr.h>
29
30/*
31 * BIOS disk device handling.
32 *
33 * Ideas and algorithms from:
34 *
35 * - NetBSD libi386/biosdisk.c
36 * - FreeBSD biosboot/disk.c
37 *
38 */
39
40#include <stand.h>
41
42#include <sys/disklabel.h>
43#include <sys/diskmbr.h>
44#include <sys/gpt.h>
44#include <machine/bootinfo.h>
45
46#include <stdarg.h>
45#include <machine/bootinfo.h>
46
47#include <stdarg.h>
48#include <uuid.h>
47
48#include <bootstrap.h>
49#include <btxv86.h>
50#include "libi386.h"
51
52#define BIOS_NUMDRIVES 0x475
53#define BIOSDISK_SECSIZE 512
54#define BUFSIZE (1 * BIOSDISK_SECSIZE)

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61#define DAMAJOR 4
62
63#ifdef DISK_DEBUG
64# define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args)
65#else
66# define DEBUG(fmt, args...)
67#endif
68
49
50#include <bootstrap.h>
51#include <btxv86.h>
52#include "libi386.h"
53
54#define BIOS_NUMDRIVES 0x475
55#define BIOSDISK_SECSIZE 512
56#define BUFSIZE (1 * BIOSDISK_SECSIZE)

--- 6 unchanged lines hidden (view full) ---

63#define DAMAJOR 4
64
65#ifdef DISK_DEBUG
66# define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args)
67#else
68# define DEBUG(fmt, args...)
69#endif
70
71struct gpt_part {
72 int gp_index;
73 uuid_t gp_type;
74 uint64_t gp_start;
75 uint64_t gp_end;
76};
77
69struct open_disk {
70 int od_dkunit; /* disk unit number */
71 int od_unit; /* BIOS unit number */
72 int od_cyl; /* BIOS geometry */
73 int od_hds;
74 int od_sec;
75 int od_boff; /* block offset from beginning of BIOS disk */
76 int od_flags;
77#define BD_MODEINT13 0x0000
78#define BD_MODEEDD1 0x0001
79#define BD_MODEEDD3 0x0002
80#define BD_MODEMASK 0x0003
81#define BD_FLOPPY 0x0004
82#define BD_LABELOK 0x0008
83#define BD_PARTTABOK 0x0010
78struct open_disk {
79 int od_dkunit; /* disk unit number */
80 int od_unit; /* BIOS unit number */
81 int od_cyl; /* BIOS geometry */
82 int od_hds;
83 int od_sec;
84 int od_boff; /* block offset from beginning of BIOS disk */
85 int od_flags;
86#define BD_MODEINT13 0x0000
87#define BD_MODEEDD1 0x0001
88#define BD_MODEEDD3 0x0002
89#define BD_MODEMASK 0x0003
90#define BD_FLOPPY 0x0004
91#define BD_LABELOK 0x0008
92#define BD_PARTTABOK 0x0010
84 struct disklabel od_disklabel;
85 int od_nslices; /* slice count */
86 struct dos_partition od_slicetab[NEXTDOSPART];
93#define BD_GPTOK 0x0020
94 union {
95 struct {
96 struct disklabel mbr_disklabel;
97 int mbr_nslices; /* slice count */
98 struct dos_partition mbr_slicetab[NEXTDOSPART];
99 } _mbr;
100 struct {
101 int gpt_nparts;
102 struct gpt_part *gpt_partitions;
103 } _gpt;
104 } _data;
87};
88
105};
106
107#define od_disklabel _data._mbr.mbr_disklabel
108#define od_nslices _data._mbr.mbr_nslices
109#define od_slicetab _data._mbr.mbr_slicetab
110#define od_nparts _data._gpt.gpt_nparts
111#define od_partitions _data._gpt.gpt_partitions
112
89/*
90 * List of BIOS devices, translation from disk unit number to
91 * BIOS unit number.
92 */
93static struct bdinfo
94{
95 int bd_unit; /* BIOS unit number */
96 int bd_flags;

--- 4 unchanged lines hidden (view full) ---

101static int bd_getgeom(struct open_disk *od);
102static int bd_read(struct open_disk *od, daddr_t dblk, int blks,
103 caddr_t dest);
104static int bd_write(struct open_disk *od, daddr_t dblk, int blks,
105 caddr_t dest);
106
107static int bd_int13probe(struct bdinfo *bd);
108
113/*
114 * List of BIOS devices, translation from disk unit number to
115 * BIOS unit number.
116 */
117static struct bdinfo
118{
119 int bd_unit; /* BIOS unit number */
120 int bd_flags;

--- 4 unchanged lines hidden (view full) ---

125static int bd_getgeom(struct open_disk *od);
126static int bd_read(struct open_disk *od, daddr_t dblk, int blks,
127 caddr_t dest);
128static int bd_write(struct open_disk *od, daddr_t dblk, int blks,
129 caddr_t dest);
130
131static int bd_int13probe(struct bdinfo *bd);
132
133static void bd_printgptpart(struct open_disk *od, struct gpt_part *gp,
134 char *prefix, int verbose);
109static void bd_printslice(struct open_disk *od, struct dos_partition *dp,
110 char *prefix, int verbose);
111static void bd_printbsdslice(struct open_disk *od, daddr_t offset,
112 char *prefix, int verbose);
113
114static int bd_init(void);
115static int bd_strategy(void *devdata, int flag, daddr_t dblk,
116 size_t size, char *buf, size_t *rsize);

--- 12 unchanged lines hidden (view full) ---

129 bd_close,
130 noioctl,
131 bd_print,
132 NULL
133};
134
135static int bd_opendisk(struct open_disk **odp, struct i386_devdesc *dev);
136static void bd_closedisk(struct open_disk *od);
135static void bd_printslice(struct open_disk *od, struct dos_partition *dp,
136 char *prefix, int verbose);
137static void bd_printbsdslice(struct open_disk *od, daddr_t offset,
138 char *prefix, int verbose);
139
140static int bd_init(void);
141static int bd_strategy(void *devdata, int flag, daddr_t dblk,
142 size_t size, char *buf, size_t *rsize);

--- 12 unchanged lines hidden (view full) ---

155 bd_close,
156 noioctl,
157 bd_print,
158 NULL
159};
160
161static int bd_opendisk(struct open_disk **odp, struct i386_devdesc *dev);
162static void bd_closedisk(struct open_disk *od);
163static int bd_open_mbr(struct open_disk *od, struct i386_devdesc *dev);
137static int bd_bestslice(struct open_disk *od);
138static void bd_checkextended(struct open_disk *od, int slicenum);
164static int bd_bestslice(struct open_disk *od);
165static void bd_checkextended(struct open_disk *od, int slicenum);
166static int bd_open_gpt(struct open_disk *od, struct i386_devdesc *dev);
167static struct gpt_part *bd_best_gptpart(struct open_disk *od);
139
140/*
141 * Translate between BIOS device numbers and our private unit numbers.
142 */
143int
144bd_bios2unit(int biosdev)
145{
146 int i;

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252
253 /* try to open the whole disk */
254 dev.d_unit = i;
255 dev.d_kind.biosdisk.slice = -1;
256 dev.d_kind.biosdisk.partition = -1;
257
258 if (!bd_opendisk(&od, &dev)) {
259
168
169/*
170 * Translate between BIOS device numbers and our private unit numbers.
171 */
172int
173bd_bios2unit(int biosdev)
174{
175 int i;

--- 105 unchanged lines hidden (view full) ---

281
282 /* try to open the whole disk */
283 dev.d_unit = i;
284 dev.d_kind.biosdisk.slice = -1;
285 dev.d_kind.biosdisk.partition = -1;
286
287 if (!bd_opendisk(&od, &dev)) {
288
289 /* Do we have a GPT table? */
290 if (od->od_flags & BD_GPTOK) {
291 for (j = 0; j < od->od_nparts; j++) {
292 sprintf(line, " disk%dp%d", i,
293 od->od_partitions[j].gp_index);
294 bd_printgptpart(od, &od->od_partitions[j], line, verbose);
295 }
296
260 /* Do we have a partition table? */
297 /* Do we have a partition table? */
261 if (od->od_flags & BD_PARTTABOK) {
298 } else if (od->od_flags & BD_PARTTABOK) {
262 dptr = &od->od_slicetab[0];
263
264 /* Check for a "dedicated" disk */
265 if ((dptr[3].dp_typ == DOSPTYP_386BSD) &&
266 (dptr[3].dp_start == 0) &&
267 (dptr[3].dp_size == 50000)) {
268 sprintf(line, " disk%d", i);
269 bd_printbsdslice(od, 0, line, verbose);

--- 4 unchanged lines hidden (view full) ---

274 }
275 }
276 }
277 bd_closedisk(od);
278 }
279 }
280}
281
299 dptr = &od->od_slicetab[0];
300
301 /* Check for a "dedicated" disk */
302 if ((dptr[3].dp_typ == DOSPTYP_386BSD) &&
303 (dptr[3].dp_start == 0) &&
304 (dptr[3].dp_size == 50000)) {
305 sprintf(line, " disk%d", i);
306 bd_printbsdslice(od, 0, line, verbose);

--- 4 unchanged lines hidden (view full) ---

311 }
312 }
313 }
314 bd_closedisk(od);
315 }
316 }
317}
318
319static uuid_t efi = GPT_ENT_TYPE_EFI;
320static uuid_t freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT;
321static uuid_t freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS;
322static uuid_t freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP;
323static uuid_t freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS;
324static uuid_t ms_basic_data = GPT_ENT_TYPE_MS_BASIC_DATA;
325
326static void
327bd_printgptpart(struct open_disk *od, struct gpt_part *gp, char *prefix,
328 int verbose)
329{
330 char stats[80];
331 char line[96];
332 uint64_t size;
333 char unit;
334
335 if (verbose) {
336 size = (gp->gp_end + 1 - gp->gp_start) / 2048;
337 unit = 'M';
338 if (size >= 10240000) {
339 size /= 1048576;
340 unit = 'T';
341 } else if (size >= 10000) {
342 size /= 1024;
343 unit = 'G';
344 }
345 sprintf(stats, " %.6ld%cB", (long)size, unit);
346 } else
347 stats[0] = '\0';
348
349 if (uuid_equal(&gp->gp_type, &efi, NULL))
350 sprintf(line, "%s: EFI%s\n", prefix, stats);
351 else if (uuid_equal(&gp->gp_type, &ms_basic_data, NULL))
352 sprintf(line, "%s: FAT/NTFS%s\n", prefix, stats);
353 else if (uuid_equal(&gp->gp_type, &freebsd_boot, NULL))
354 sprintf(line, "%s: FreeBSD boot%s\n", prefix, stats);
355 else if (uuid_equal(&gp->gp_type, &freebsd_ufs, NULL))
356 sprintf(line, "%s: FreeBSD UFS%s\n", prefix, stats);
357 else if (uuid_equal(&gp->gp_type, &freebsd_zfs, NULL))
358 sprintf(line, "%s: FreeBSD ZFS%s\n", prefix, stats);
359 else if (uuid_equal(&gp->gp_type, &freebsd_swap, NULL))
360 sprintf(line, "%s: FreeBSD swap%s\n", prefix, stats);
361 else
362 sprintf(line, "%s: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x%s\n",
363 gp->gp_type.time_low, gp->gp_type.time_mid,
364 gp->gp_type.time_hi_and_version,
365 gp->gp_type.clock_seq_hi_and_reserved, gp->gp_type.clock_seq_low,
366 gp->gp_type.node[0], gp->gp_type.node[1], gp->gp_type.node[2],
367 gp->gp_type.node[3], gp->gp_type.node[4], gp->gp_type.node[5],
368 stats);
369 pager_output(line);
370}
371
282/*
283 * Print information about slices on a disk. For the size calculations we
284 * assume a 512 byte sector.
285 */
286static void
287bd_printslice(struct open_disk *od, struct dos_partition *dp, char *prefix,
288 int verbose)
289{

--- 152 unchanged lines hidden (view full) ---

442 ((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data = od;
443 DEBUG("open_disk %p, partition at 0x%x", od, od->od_boff);
444 return(0);
445}
446
447static int
448bd_opendisk(struct open_disk **odp, struct i386_devdesc *dev)
449{
372/*
373 * Print information about slices on a disk. For the size calculations we
374 * assume a 512 byte sector.
375 */
376static void
377bd_printslice(struct open_disk *od, struct dos_partition *dp, char *prefix,
378 int verbose)
379{

--- 152 unchanged lines hidden (view full) ---

532 ((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data = od;
533 DEBUG("open_disk %p, partition at 0x%x", od, od->od_boff);
534 return(0);
535}
536
537static int
538bd_opendisk(struct open_disk **odp, struct i386_devdesc *dev)
539{
450 struct dos_partition *dptr;
451 struct disklabel *lp;
452 struct open_disk *od;
540 struct open_disk *od;
453 int sector, slice, i;
454 int error;
541 int error;
455 char buf[BUFSIZE];
456
457 if (dev->d_unit >= nbdinfo) {
458 DEBUG("attempt to open nonexistent disk");
459 return(ENXIO);
460 }
461
462 od = (struct open_disk *)malloc(sizeof(struct open_disk));
463 if (!od) {
464 DEBUG("no memory");
465 return (ENOMEM);
466 }
467
468 /* Look up BIOS unit number, intialise open_disk structure */
469 od->od_dkunit = dev->d_unit;
470 od->od_unit = bdinfo[od->od_dkunit].bd_unit;
471 od->od_flags = bdinfo[od->od_dkunit].bd_flags;
472 od->od_boff = 0;
542
543 if (dev->d_unit >= nbdinfo) {
544 DEBUG("attempt to open nonexistent disk");
545 return(ENXIO);
546 }
547
548 od = (struct open_disk *)malloc(sizeof(struct open_disk));
549 if (!od) {
550 DEBUG("no memory");
551 return (ENOMEM);
552 }
553
554 /* Look up BIOS unit number, intialise open_disk structure */
555 od->od_dkunit = dev->d_unit;
556 od->od_unit = bdinfo[od->od_dkunit].bd_unit;
557 od->od_flags = bdinfo[od->od_dkunit].bd_flags;
558 od->od_boff = 0;
473 od->od_nslices = 0;
474 error = 0;
559 error = 0;
475 DEBUG("open '%s', unit 0x%x slice %d partition %c",
560 DEBUG("open '%s', unit 0x%x slice %d partition %d",
476 i386_fmtdev(dev), dev->d_unit,
561 i386_fmtdev(dev), dev->d_unit,
477 dev->d_kind.biosdisk.slice, dev->d_kind.biosdisk.partition + 'a');
562 dev->d_kind.biosdisk.slice, dev->d_kind.biosdisk.partition);
478
479 /* Get geometry for this open (removable device may have changed) */
480 if (bd_getgeom(od)) {
481 DEBUG("can't get geometry");
482 error = ENXIO;
483 goto out;
484 }
485
563
564 /* Get geometry for this open (removable device may have changed) */
565 if (bd_getgeom(od)) {
566 DEBUG("can't get geometry");
567 error = ENXIO;
568 goto out;
569 }
570
571 /* Determine disk layout. */
572 error = bd_open_gpt(od, dev);
573 if (error)
574 error = bd_open_mbr(od, dev);
575
576 out:
577 if (error) {
578 free(od);
579 } else {
580 *odp = od; /* return the open disk */
581 }
582 return(error);
583}
584
585static int
586bd_open_mbr(struct open_disk *od, struct i386_devdesc *dev)
587{
588 struct dos_partition *dptr;
589 struct disklabel *lp;
590 int sector, slice, i;
591 int error;
592 char buf[BUFSIZE];
593
486 /*
487 * Following calculations attempt to determine the correct value
488 * for d->od_boff by looking for the slice and partition specified,
489 * or searching for reasonable defaults.
490 */
491
492 /*
493 * Find the slice in the DOS slice table.
494 */
594 /*
595 * Following calculations attempt to determine the correct value
596 * for d->od_boff by looking for the slice and partition specified,
597 * or searching for reasonable defaults.
598 */
599
600 /*
601 * Find the slice in the DOS slice table.
602 */
603 od->od_nslices = 0;
495 if (bd_read(od, 0, 1, buf)) {
496 DEBUG("error reading MBR");
604 if (bd_read(od, 0, 1, buf)) {
605 DEBUG("error reading MBR");
497 error = EIO;
498 goto out;
606 return (EIO);
499 }
500
501 /*
502 * Check the slice table magic.
503 */
504 if (((u_char)buf[0x1fe] != 0x55) || ((u_char)buf[0x1ff] != 0xaa)) {
505 /* If a slice number was explicitly supplied, this is an error */
506 if (dev->d_kind.biosdisk.slice > 0) {
507 DEBUG("no slice table/MBR (no magic)");
607 }
608
609 /*
610 * Check the slice table magic.
611 */
612 if (((u_char)buf[0x1fe] != 0x55) || ((u_char)buf[0x1ff] != 0xaa)) {
613 /* If a slice number was explicitly supplied, this is an error */
614 if (dev->d_kind.biosdisk.slice > 0) {
615 DEBUG("no slice table/MBR (no magic)");
508 error = ENOENT;
509 goto out;
616 return (ENOENT);
510 }
511 sector = 0;
512 goto unsliced; /* may be a floppy */
513 }
514
515 /*
516 * copy the partition table, then pick up any extended partitions.
517 */

--- 13 unchanged lines hidden (view full) ---

531
532 /*
533 * if a slice number was supplied but not found, this is an error.
534 */
535 if (dev->d_kind.biosdisk.slice > 0) {
536 slice = dev->d_kind.biosdisk.slice - 1;
537 if (slice >= od->od_nslices) {
538 DEBUG("slice %d not found", slice);
617 }
618 sector = 0;
619 goto unsliced; /* may be a floppy */
620 }
621
622 /*
623 * copy the partition table, then pick up any extended partitions.
624 */

--- 13 unchanged lines hidden (view full) ---

638
639 /*
640 * if a slice number was supplied but not found, this is an error.
641 */
642 if (dev->d_kind.biosdisk.slice > 0) {
643 slice = dev->d_kind.biosdisk.slice - 1;
644 if (slice >= od->od_nslices) {
645 DEBUG("slice %d not found", slice);
539 error = ENOENT;
540 goto out;
646 return (ENOENT);
541 }
542 }
543
544 /*
545 * Check for the historically bogus MBR found on true dedicated disks
546 */
547 if ((dptr[3].dp_typ == DOSPTYP_386BSD) &&
548 (dptr[3].dp_start == 0) &&
549 (dptr[3].dp_size == 50000)) {
550 sector = 0;
551 goto unsliced;
552 }
553
554 /* Try to auto-detect the best slice; this should always give a slice number */
555 if (dev->d_kind.biosdisk.slice == 0) {
556 slice = bd_bestslice(od);
557 if (slice == -1) {
647 }
648 }
649
650 /*
651 * Check for the historically bogus MBR found on true dedicated disks
652 */
653 if ((dptr[3].dp_typ == DOSPTYP_386BSD) &&
654 (dptr[3].dp_start == 0) &&
655 (dptr[3].dp_size == 50000)) {
656 sector = 0;
657 goto unsliced;
658 }
659
660 /* Try to auto-detect the best slice; this should always give a slice number */
661 if (dev->d_kind.biosdisk.slice == 0) {
662 slice = bd_bestslice(od);
663 if (slice == -1) {
558 error = ENOENT;
559 goto out;
664 return (ENOENT);
560 }
561 dev->d_kind.biosdisk.slice = slice;
562 }
563
564 dptr = &od->od_slicetab[0];
565 /*
566 * Accept the supplied slice number unequivocally (we may be looking
567 * at a DOS partition).

--- 17 unchanged lines hidden (view full) ---

585 */
586 if (dev->d_kind.biosdisk.partition < 0) {
587 od->od_boff = sector; /* no partition, must be after the slice */
588 DEBUG("opening raw slice");
589 } else {
590
591 if (bd_read(od, sector + LABELSECTOR, 1, buf)) {
592 DEBUG("error reading disklabel");
665 }
666 dev->d_kind.biosdisk.slice = slice;
667 }
668
669 dptr = &od->od_slicetab[0];
670 /*
671 * Accept the supplied slice number unequivocally (we may be looking
672 * at a DOS partition).

--- 17 unchanged lines hidden (view full) ---

690 */
691 if (dev->d_kind.biosdisk.partition < 0) {
692 od->od_boff = sector; /* no partition, must be after the slice */
693 DEBUG("opening raw slice");
694 } else {
695
696 if (bd_read(od, sector + LABELSECTOR, 1, buf)) {
697 DEBUG("error reading disklabel");
593 error = EIO;
594 goto out;
698 return (EIO);
595 }
596 DEBUG("copy %d bytes of label from %p to %p", sizeof(struct disklabel), buf + LABELOFFSET, &od->od_disklabel);
597 bcopy(buf + LABELOFFSET, &od->od_disklabel, sizeof(struct disklabel));
598 lp = &od->od_disklabel;
599 od->od_flags |= BD_LABELOK;
600
601 if (lp->d_magic != DISKMAGIC) {
602 DEBUG("no disklabel");
699 }
700 DEBUG("copy %d bytes of label from %p to %p", sizeof(struct disklabel), buf + LABELOFFSET, &od->od_disklabel);
701 bcopy(buf + LABELOFFSET, &od->od_disklabel, sizeof(struct disklabel));
702 lp = &od->od_disklabel;
703 od->od_flags |= BD_LABELOK;
704
705 if (lp->d_magic != DISKMAGIC) {
706 DEBUG("no disklabel");
603 error = ENOENT;
604 goto out;
707 return (ENOENT);
605 }
606 if (dev->d_kind.biosdisk.partition >= lp->d_npartitions) {
607 DEBUG("partition '%c' exceeds partitions in table (a-'%c')",
608 'a' + dev->d_kind.biosdisk.partition, 'a' + lp->d_npartitions);
708 }
709 if (dev->d_kind.biosdisk.partition >= lp->d_npartitions) {
710 DEBUG("partition '%c' exceeds partitions in table (a-'%c')",
711 'a' + dev->d_kind.biosdisk.partition, 'a' + lp->d_npartitions);
609 error = EPART;
610 goto out;
611
712 return (EPART);
612 }
613
614#ifdef DISK_DEBUG
615 /* Complain if the partition is unused unless this is a floppy. */
616 if ((lp->d_partitions[dev->d_kind.biosdisk.partition].p_fstype == FS_UNUSED) &&
617 !(od->od_flags & BD_FLOPPY))
618 DEBUG("warning, partition marked as unused");
619#endif
620
621 od->od_boff =
622 lp->d_partitions[dev->d_kind.biosdisk.partition].p_offset -
623 lp->d_partitions[RAW_PART].p_offset +
624 sector;
625 }
713 }
714
715#ifdef DISK_DEBUG
716 /* Complain if the partition is unused unless this is a floppy. */
717 if ((lp->d_partitions[dev->d_kind.biosdisk.partition].p_fstype == FS_UNUSED) &&
718 !(od->od_flags & BD_FLOPPY))
719 DEBUG("warning, partition marked as unused");
720#endif
721
722 od->od_boff =
723 lp->d_partitions[dev->d_kind.biosdisk.partition].p_offset -
724 lp->d_partitions[RAW_PART].p_offset +
725 sector;
726 }
626
627 out:
628 if (error) {
629 free(od);
630 } else {
631 *odp = od; /* return the open disk */
632 }
633 return(error);
727 return (0);
634}
635
636static void
637bd_checkextended(struct open_disk *od, int slicenum)
638{
639 char buf[BIOSDISK_SECSIZE];
640 struct dos_partition *dp;
641 u_int base;

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734 }
735 if (pref < preflevel) {
736 preflevel = pref;
737 prefslice = i + 1;
738 }
739 }
740 return (prefslice);
741}
728}
729
730static void
731bd_checkextended(struct open_disk *od, int slicenum)
732{
733 char buf[BIOSDISK_SECSIZE];
734 struct dos_partition *dp;
735 u_int base;

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828 }
829 if (pref < preflevel) {
830 preflevel = pref;
831 prefslice = i + 1;
832 }
833 }
834 return (prefslice);
835}
742
836
837static int
838bd_open_gpt(struct open_disk *od, struct i386_devdesc *dev)
839{
840 struct dos_partition *dp;
841 struct gpt_hdr *hdr;
842 struct gpt_ent *ent;
843 struct gpt_part *gp;
844 int entries_per_sec, error, i, part;
845 daddr_t lba, elba;
846 char gpt[BIOSDISK_SECSIZE], tbl[BIOSDISK_SECSIZE];
847
848 /*
849 * Following calculations attempt to determine the correct value
850 * for d->od_boff by looking for the slice and partition specified,
851 * or searching for reasonable defaults.
852 */
853 error = 0;
854
855 /* First, read the MBR and see if we have a PMBR. */
856 if (bd_read(od, 0, 1, tbl)) {
857 DEBUG("error reading MBR");
858 return (EIO);
859 }
860
861 /* Check the slice table magic. */
862 if (((u_char)tbl[0x1fe] != 0x55) || ((u_char)tbl[0x1ff] != 0xaa))
863 return (ENXIO);
864
865 /* Check for GPT slice. */
866 part = 0;
867 dp = (struct dos_partition *)(tbl + DOSPARTOFF);
868 for (i = 0; i < NDOSPART; i++) {
869 if (dp[i].dp_typ == 0xee)
870 part++;
871 else if (dp[i].dp_typ != 0x00)
872 return (EINVAL);
873 }
874 if (part != 1)
875 return (EINVAL);
876
877 /* Read primary GPT table header. */
878 if (bd_read(od, 1, 1, gpt)) {
879 DEBUG("error reading GPT header");
880 return (EIO);
881 }
882 hdr = (struct gpt_hdr *)gpt;
883 if (bcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0 ||
884 hdr->hdr_lba_self != 1 || hdr->hdr_revision < 0x00010000 ||
885 hdr->hdr_entsz < sizeof(*ent) ||
886 BIOSDISK_SECSIZE % hdr->hdr_entsz != 0) {
887 DEBUG("Invalid GPT header\n");
888 return (EINVAL);
889 }
890
891 /* Now walk the partition table to count the number of valid partitions. */
892 part = 0;
893 entries_per_sec = BIOSDISK_SECSIZE / hdr->hdr_entsz;
894 elba = hdr->hdr_lba_table + hdr->hdr_entries / entries_per_sec;
895 for (lba = hdr->hdr_lba_table; lba < elba; lba++) {
896 if (bd_read(od, lba, 1, tbl)) {
897 DEBUG("error reading GPT table");
898 return (EIO);
899 }
900 for (i = 0; i < entries_per_sec; i++) {
901 ent = (struct gpt_ent *)(tbl + i * hdr->hdr_entsz);
902 if (uuid_is_nil(&ent->ent_type, NULL) || ent->ent_lba_start == 0 ||
903 ent->ent_lba_end < ent->ent_lba_start)
904 continue;
905 part++;
906 }
907 }
908
909 /* Save the important information about all the valid partitions. */
910 od->od_nparts = part;
911 if (part != 0) {
912 od->od_partitions = malloc(part * sizeof(struct gpt_part));
913 part = 0;
914 for (lba = hdr->hdr_lba_table; lba < elba; lba++) {
915 if (bd_read(od, lba, 1, tbl)) {
916 DEBUG("error reading GPT table");
917 error = EIO;
918 goto out;
919 }
920 for (i = 0; i < entries_per_sec; i++) {
921 ent = (struct gpt_ent *)(tbl + i * hdr->hdr_entsz);
922 if (uuid_is_nil(&ent->ent_type, NULL) ||
923 ent->ent_lba_start == 0 ||
924 ent->ent_lba_end < ent->ent_lba_start)
925 continue;
926 od->od_partitions[part].gp_index = (lba - hdr->hdr_lba_table) *
927 entries_per_sec + i + 1;
928 od->od_partitions[part].gp_type = ent->ent_type;
929 od->od_partitions[part].gp_start = ent->ent_lba_start;
930 od->od_partitions[part].gp_end = ent->ent_lba_end;
931 part++;
932 }
933 }
934 }
935 od->od_flags |= BD_GPTOK;
936
937 /* Is this a request for the whole disk? */
938 if (dev->d_kind.biosdisk.slice < 0) {
939 od->od_boff = 0;
940 return (0);
941 }
942
943 /*
944 * If a partition number was supplied, then the user is trying to use
945 * an MBR address rather than a GPT address, so fail.
946 */
947 if (dev->d_kind.biosdisk.partition != 0xff) {
948 error = ENOENT;
949 goto out;
950 }
951
952 /* If a slice number was supplied but not found, this is an error. */
953 gp = NULL;
954 if (dev->d_kind.biosdisk.slice > 0) {
955 for (i = 0; i < od->od_nparts; i++) {
956 if (od->od_partitions[i].gp_index == dev->d_kind.biosdisk.slice) {
957 gp = &od->od_partitions[i];
958 break;
959 }
960 }
961 if (gp == NULL) {
962 DEBUG("partition %d not found", dev->d_kind.biosdisk.slice);
963 error = ENOENT;
964 goto out;
965 }
966 }
967
968 /* Try to auto-detect the best partition. */
969 if (dev->d_kind.biosdisk.slice == 0) {
970 gp = bd_best_gptpart(od);
971 if (gp == NULL) {
972 error = ENOENT;
973 goto out;
974 }
975 dev->d_kind.biosdisk.slice = gp->gp_index;
976 }
977 od->od_boff = gp->gp_start;
978
979out:
980 if (error)
981 free(od->od_partitions);
982 return (error);
983}
984
985static struct gpt_part *
986bd_best_gptpart(struct open_disk *od)
987{
988 struct gpt_part *gp, *prefpart;
989 int i, pref, preflevel;
990
991 prefpart = NULL;
992 preflevel = PREF_NONE;
993
994 gp = od->od_partitions;
995 for (i = 0; i < od->od_nparts; i++, gp++) {
996 /* Windows. XXX: Also Linux. */
997 if (uuid_equal(&gp->gp_type, &ms_basic_data, NULL))
998 pref = PREF_DOS;
999 /* FreeBSD */
1000 else if (uuid_equal(&gp->gp_type, &freebsd_ufs, NULL) ||
1001 uuid_equal(&gp->gp_type, &freebsd_zfs, NULL))
1002 pref = PREF_FBSD;
1003 else
1004 pref = PREF_NONE;
1005 if (pref < preflevel) {
1006 preflevel = pref;
1007 prefpart = gp;
1008 }
1009 }
1010 return (prefpart);
1011}
1012
743static int
744bd_close(struct open_file *f)
745{
746 struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data);
747
748 bd_closedisk(od);
749 return(0);
750}
751
752static void
753bd_closedisk(struct open_disk *od)
754{
755 DEBUG("open_disk %p", od);
756#if 0
757 /* XXX is this required? (especially if disk already open...) */
758 if (od->od_flags & BD_FLOPPY)
759 delay(3000000);
760#endif
1013static int
1014bd_close(struct open_file *f)
1015{
1016 struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)(f->f_devdata))->d_kind.biosdisk.data);
1017
1018 bd_closedisk(od);
1019 return(0);
1020}
1021
1022static void
1023bd_closedisk(struct open_disk *od)
1024{
1025 DEBUG("open_disk %p", od);
1026#if 0
1027 /* XXX is this required? (especially if disk already open...) */
1028 if (od->od_flags & BD_FLOPPY)
1029 delay(3000000);
1030#endif
1031 if (od->od_flags & BD_GPTOK)
1032 free(od->od_partitions);
761 free(od);
762}
763
764static int
765bd_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
766{
767 struct bcache_devdata bcd;
768 struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data);

--- 367 unchanged lines hidden --- 		1033 free(od);
1034}
1035
1036static int
1037bd_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
1038{
1039 struct bcache_devdata bcd;
1040 struct open_disk *od = (struct open_disk *)(((struct i386_devdesc *)devdata)->d_kind.biosdisk.data);

--- 367 unchanged lines hidden ---