2 * Mach Operating System
3 * Copyright (c) 1992 Carnegie Mellon University
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
16 * Carnegie Mellon requests users of this software to return to
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
31 #include <sys/disklabel.h>
32 #include <sys/diskmbr.h>
33 #include <sys/endian.h>
34 #include <sys/param.h>
36 #include <sys/mount.h>
53 static char lbuf[LBUF];
57 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992
59 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University
60 * Copyright (c) 1989 Robert. V. Baron
64 #define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp
66 #define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs)
68 #define MAX_SEC_SIZE 2048 /* maximum section size that is supported */
69 #define MIN_SEC_SIZE 512 /* the sector size to start sensing at */
70 static int secsize = 0; /* the sensed sector size */
74 static int cyls, sectors, heads, cylsecs, disksecs;
77 unsigned char padding[2]; /* force the longs to be long aligned */
78 unsigned char *bootinst; /* boot code */
80 struct dos_partition parts[NDOSPART];
83 static struct mboot mboot;
89 static uint dos_heads;
90 static uint dos_sectors;
91 static uint dos_cylsecs;
93 #define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0))
94 #define DOSCYL(c) (c & 0xff)
98 static int current_line_number;
100 static int geom_processed = 0;
101 static int part_processed = 0;
102 static int active_processed = 0;
113 static int B_flag = 0; /* replace boot code */
114 static int I_flag = 0; /* use entire disk for FreeBSD */
115 static int a_flag = 0; /* set active partition */
116 static char *b_flag = NULL; /* path to boot code */
117 static int i_flag = 0; /* replace partition data */
118 static int q_flag = 0; /* Be quiet */
119 static int u_flag = 0; /* update partition data */
120 static int s_flag = 0; /* Print a summary and exit */
121 static int t_flag = 0; /* test only */
122 static char *f_flag = NULL; /* Read config info from file */
123 static int v_flag = 0; /* Be verbose */
124 static int print_config_flag = 0;
126 static struct part_type
132 ,{0x01, "Primary DOS with 12 bit FAT"}
133 ,{0x02, "XENIX / file system"}
134 ,{0x03, "XENIX /usr file system"}
135 ,{0x04, "Primary DOS with 16 bit FAT (< 32MB)"}
136 ,{0x05, "Extended DOS"}
137 ,{0x06, "Primary 'big' DOS (>= 32MB)"}
138 ,{0x07, "OS/2 HPFS, NTFS, QNX-2 (16 bit) or Advanced UNIX"}
139 ,{0x08, "AIX file system or SplitDrive"}
140 ,{0x09, "AIX boot partition or Coherent"}
141 ,{0x0A, "OS/2 Boot Manager, OPUS or Coherent swap"}
142 ,{0x0B, "DOS or Windows 95 with 32 bit FAT"}
143 ,{0x0C, "DOS or Windows 95 with 32 bit FAT (LBA)"}
144 ,{0x0E, "Primary 'big' DOS (>= 32MB, LBA)"}
145 ,{0x0F, "Extended DOS (LBA)"}
147 ,{0x11, "OS/2 BM: hidden DOS with 12-bit FAT"}
148 ,{0x12, "Compaq diagnostics"}
149 ,{0x14, "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)"}
150 ,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"}
151 ,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"}
152 ,{0x18, "AST Windows swapfile"}
154 ,{0x3C, "PartitionMagic recovery"}
157 ,{0x41, "Linux/MINIX (sharing disk with DRDOS)"}
158 ,{0x42, "SFS or Linux swap (sharing disk with DRDOS)"}
159 ,{0x43, "Linux native (sharing disk with DRDOS)"}
160 ,{0x4D, "QNX 4.2 Primary"}
161 ,{0x4E, "QNX 4.2 Secondary"}
162 ,{0x4F, "QNX 4.2 Tertiary"}
163 ,{0x50, "DM (disk manager)"}
164 ,{0x51, "DM6 Aux1 (or Novell)"}
165 ,{0x52, "CP/M or Microport SysV/AT"}
168 ,{0x55, "EZ-Drive (disk manager)"}
169 ,{0x56, "Golden Bow (disk manager)"}
170 ,{0x5c, "Priam Edisk (disk manager)"} /* according to S. Widlake */
172 ,{0x63, "System V/386 (such as ISC UNIX), GNU HURD or Mach"}
173 ,{0x64, "Novell Netware/286 2.xx"}
174 ,{0x65, "Novell Netware/386 3.xx"}
175 ,{0x70, "DiskSecure Multi-Boot"}
178 ,{0x78, "QNX4.x 2nd part"}
179 ,{0x79, "QNX4.x 3rd part"}
180 ,{0x80, "Minix until 1.4a"}
181 ,{0x81, "Minix since 1.4b, early Linux partition or Mitac disk manager"}
182 ,{0x82, "Linux swap or Solaris x86"}
183 ,{0x83, "Linux native"}
184 ,{0x84, "OS/2 hidden C: drive"}
185 ,{0x85, "Linux extended"}
186 ,{0x86, "NTFS volume set??"}
187 ,{0x87, "NTFS volume set??"}
188 ,{0x93, "Amoeba file system"}
189 ,{0x94, "Amoeba bad block table"}
191 ,{0xA0, "Suspend to Disk"}
192 ,{0xA5, "FreeBSD/NetBSD/386BSD"}
198 ,{0xB7, "BSDI BSD/386 file system"}
199 ,{0xB8, "BSDI BSD/386 swap"}
200 ,{0xBE, "Solaris x86 boot"}
201 ,{0xBF, "Solaris x86 (new)"}
202 ,{0xC1, "DRDOS/sec with 12-bit FAT"}
203 ,{0xC4, "DRDOS/sec with 16-bit FAT (< 32MB)"}
204 ,{0xC6, "DRDOS/sec with 16-bit FAT (>= 32MB)"}
206 ,{0xDB, "CP/M, Concurrent CP/M, Concurrent DOS or CTOS"}
207 ,{0xE1, "DOS access or SpeedStor with 12-bit FAT extended partition"}
208 ,{0xE3, "DOS R/O or SpeedStor"}
209 ,{0xE4, "SpeedStor with 16-bit FAT extended partition < 1024 cyl."}
210 ,{0xEB, "BeOS file system"}
212 ,{0xEF, "EFI System Partition"}
214 ,{0xF2, "DOS 3.3+ Secondary"}
215 ,{0xF4, "SpeedStor large partition"}
216 ,{0xFE, "SpeedStor >1024 cyl. or LANstep"}
217 ,{0xFF, "Xenix bad blocks table"}
220 static void print_s0(int which);
221 static void print_part(int i);
222 static void init_sector0(unsigned long start);
223 static void init_boot(void);
224 static void change_part(int i);
225 static void print_params(void);
226 static void change_active(int which);
227 static void change_code(void);
228 static void get_params_to_use(void);
229 static char *get_rootdisk(void);
230 static void dos(struct dos_partition *partp);
231 static int open_disk(int flag);
232 static ssize_t read_disk(off_t sector, void *buf);
233 static int write_disk(off_t sector, void *buf);
234 static int get_params(void);
235 static int read_s0(void);
236 static int write_s0(void);
237 static int ok(const char *str);
238 static int decimal(const char *str, int *num, int deflt);
239 static const char *get_type(int type);
240 static int read_config(char *config_file);
241 static void reset_boot(void);
242 static int sanitize_partition(struct dos_partition *);
243 static void usage(void);
246 main(int argc, char *argv[])
251 struct dos_partition *partp;
253 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1)
274 print_config_flag = 1;
300 if (f_flag || i_flag)
308 disk = get_rootdisk();
310 if (stat(argv[0], &sb) == 0) {
311 /* OK, full pathname given */
313 } else if (errno == ENOENT && argv[0][0] != '/') {
314 /* Try prepending "/dev" */
315 asprintf(&disk, "%s%s", _PATH_DEV, argv[0]);
317 errx(1, "out of memory");
319 /* other stat error, let it fail below */
323 if (open_disk(u_flag) < 0)
324 err(1, "cannot open disk %s", disk);
326 /* (abu)use mboot.bootinst to probe for the sector size */
327 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL)
328 err(1, "cannot allocate buffer to determine disk sector size");
329 if (read_disk(0, mboot.bootinst) == -1)
330 errx(1, "could not detect sector size");
331 free(mboot.bootinst);
332 mboot.bootinst = NULL;
334 if (print_config_flag) {
338 printf("# %s\n", disk);
339 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors);
341 for (i = 0; i < NDOSPART; i++) {
342 partp = ((struct dos_partition *)&mboot.parts) + i;
344 if (partp->dp_start == 0 && partp->dp_size == 0)
347 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ,
348 (u_long)partp->dp_start, (u_long)partp->dp_size);
350 /* Fill flags for the partition. */
351 if (partp->dp_flag & 0x80)
352 printf("a %d\n", i + 1);
359 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads,
361 printf("Part %11s %11s Type Flags\n", "Start", "Size");
362 for (i = 0; i < NDOSPART; i++) {
363 partp = ((struct dos_partition *) &mboot.parts) + i;
364 if (partp->dp_start == 0 && partp->dp_size == 0)
366 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1,
367 (u_long) partp->dp_start,
368 (u_long) partp->dp_size, partp->dp_typ,
374 printf("******* Working on device %s *******\n",disk);
379 partp = (struct dos_partition *) (&mboot.parts[0]);
380 partp->dp_typ = DOSPTYP_386BSD;
381 partp->dp_flag = ACTIVE;
382 partp->dp_start = dos_sectors;
383 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs -
393 if (read_s0() || i_flag)
395 if (!read_config(f_flag))
408 init_sector0(dos_sectors);
410 printf("Media sector size is %d\n", secsize);
411 printf("Warning: BIOS sector numbering starts with sector 1\n");
412 printf("Information from DOS bootblock is:\n");
414 for (i = 1; i <= NDOSPART; i++)
417 change_part(partition);
419 if (u_flag || a_flag)
420 change_active(partition);
425 if (u_flag || a_flag || B_flag) {
427 printf("\nWe haven't changed the partition table yet. ");
428 printf("This is your last chance.\n");
432 if (ok("Should we write new partition table?"))
435 printf("\n-t flag specified -- partition table not written.\n");
446 fprintf(stderr, "%s%s",
447 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n",
448 " fdisk -f configfile [-itv] [disk]\n");
458 printf("Information from DOS bootblock is:\n");
460 for (i = 1; i <= NDOSPART; i++)
461 printf("%d: ", i), print_part(i);
466 static struct dos_partition mtpart;
471 struct dos_partition *partp;
474 partp = ((struct dos_partition *) &mboot.parts) + i - 1;
476 if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) {
477 printf("<UNUSED>\n");
481 * Be careful not to overflow.
483 part_mb = partp->dp_size;
485 part_mb /= (1024 * 1024);
486 printf("sysid %d (%#04x),(%s)\n", partp->dp_typ, partp->dp_typ,
487 get_type(partp->dp_typ));
488 printf(" start %lu, size %lu (%ju Meg), flag %x%s\n",
489 (u_long)partp->dp_start,
490 (u_long)partp->dp_size,
493 partp->dp_flag == ACTIVE ? " (active)" : "");
494 printf("\tbeg: cyl %d/ head %d/ sector %d;\n\tend: cyl %d/ head %d/ sector %d\n"
495 ,DPCYL(partp->dp_scyl, partp->dp_ssect)
497 ,DPSECT(partp->dp_ssect)
498 ,DPCYL(partp->dp_ecyl, partp->dp_esect)
500 ,DPSECT(partp->dp_esect));
512 fname = b_flag ? b_flag : "/boot/mbr";
513 if ((fdesc = open(fname, O_RDONLY)) == -1 ||
514 fstat(fdesc, &sb) == -1)
516 if ((mboot.bootinst_size = sb.st_size) % secsize != 0)
517 errx(1, "%s: length must be a multiple of sector size", fname);
518 if (mboot.bootinst != NULL)
519 free(mboot.bootinst);
520 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL)
521 errx(1, "%s: unable to allocate read buffer", fname);
522 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 ||
525 if (n != mboot.bootinst_size)
526 errx(1, "%s: short read", fname);
528 if (mboot.bootinst != NULL)
529 free(mboot.bootinst);
530 mboot.bootinst_size = secsize;
531 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL)
532 errx(1, "unable to allocate boot block buffer");
533 memset(mboot.bootinst, 0, mboot.bootinst_size);
534 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
540 init_sector0(unsigned long start)
542 struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[0]);
546 partp->dp_typ = DOSPTYP_386BSD;
547 partp->dp_flag = ACTIVE;
548 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors;
551 partp->dp_start = start;
552 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start;
560 struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1;
562 printf("The data for partition %d is:\n", i);
565 if (u_flag && ok("Do you want to change it?")) {
569 bzero((char *)partp, sizeof (struct dos_partition));
572 printf("\nThe static data for the slice 1 has been reinitialized to:\n");
578 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp);
579 Decimal("start", partp->dp_start, tmp);
580 Decimal("size", partp->dp_size, tmp);
581 if (!sanitize_partition(partp)) {
582 warnx("ERROR: failed to adjust; setting sysid to 0");
586 if (ok("Explicitly specify beg/end address ?"))
589 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect);
591 tsec = DPSECT(partp->dp_ssect);
592 Decimal("beginning cylinder", tcyl, tmp);
593 Decimal("beginning head", thd, tmp);
594 Decimal("beginning sector", tsec, tmp);
595 partp->dp_scyl = DOSCYL(tcyl);
596 partp->dp_ssect = DOSSECT(tsec,tcyl);
599 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect);
601 tsec = DPSECT(partp->dp_esect);
602 Decimal("ending cylinder", tcyl, tmp);
603 Decimal("ending head", thd, tmp);
604 Decimal("ending sector", tsec, tmp);
605 partp->dp_ecyl = DOSCYL(tcyl);
606 partp->dp_esect = DOSSECT(tsec,tcyl);
612 } while (!ok("Are we happy with this entry?"));
619 printf("parameters extracted from in-core disklabel are:\n");
620 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
621 ,cyls,heads,sectors,cylsecs);
622 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63)
623 printf("Figures below won't work with BIOS for partitions not in cyl 1\n");
624 printf("parameters to be used for BIOS calculations are:\n");
625 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
626 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs);
630 change_active(int which)
632 struct dos_partition *partp = &mboot.parts[0];
633 int active, i, new, tmp;
636 for (i = 0; i < NDOSPART; i++) {
637 if ((partp[i].dp_flag & ACTIVE) == 0)
639 printf("Partition %d is marked active\n", i + 1);
643 if (a_flag && which != -1)
645 else if (active == -1)
648 if (!ok("Do you want to change the active partition?"))
653 Decimal("active partition", new, tmp);
654 if (new < 1 || new > 4) {
655 printf("Active partition number must be in range 1-4."
660 } while (!ok("Are you happy with this choice"));
661 for (i = 0; i < NDOSPART; i++)
662 partp[i].dp_flag = 0;
663 if (active > 0 && active <= NDOSPART)
664 partp[active-1].dp_flag = ACTIVE;
670 if (ok("Do you want to change the boot code?"))
679 if (ok("Do you want to change our idea of what BIOS thinks ?"))
683 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp);
684 Decimal("BIOS's idea of #heads", dos_heads, tmp);
685 Decimal("BIOS's idea of #sectors", dos_sectors, tmp);
686 dos_cylsecs = dos_heads * dos_sectors;
689 while(!ok("Are you happy with this choice"));
694 /***********************************************\
695 * Change real numbers into strange dos numbers *
696 \***********************************************/
698 dos(struct dos_partition *partp)
703 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) {
704 memcpy(partp, &mtpart, sizeof(*partp));
709 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors;
710 cy = partp->dp_start / dos_cylsecs;
711 sec = partp->dp_start % dos_sectors + 1;
712 partp->dp_scyl = DOSCYL(cy);
713 partp->dp_ssect = DOSSECT(sec, cy);
716 end = partp->dp_start + partp->dp_size - 1;
717 partp->dp_ehd = end % dos_cylsecs / dos_sectors;
718 cy = end / dos_cylsecs;
719 sec = end % dos_sectors + 1;
720 partp->dp_ecyl = DOSCYL(cy);
721 partp->dp_esect = DOSSECT(sec, cy);
730 if (stat(disk, &st) == -1) {
733 warnx("can't get file status of %s", disk);
736 if ( !(st.st_mode & S_IFCHR) )
737 warnx("device %s is not character special", disk);
738 rwmode = a_flag || I_flag || B_flag || flag ? O_RDWR : O_RDONLY;
739 fd = open(disk, rwmode);
740 if (fd == -1 && errno == EPERM && rwmode == O_RDWR)
741 fd = open(disk, O_RDONLY);
742 if (fd == -1 && errno == ENXIO)
745 warnx("can't open device %s", disk);
748 if (get_params() == -1) {
749 warnx("can't get disk parameters on %s", disk);
756 read_disk(off_t sector, void *buf)
759 lseek(fd, (sector * 512), 0);
761 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE;
764 int size = read(fd, buf, secsize);
766 /* it worked so return */
770 return read(fd, buf, secsize);
772 /* we failed to read at any of the sizes */
777 write_disk(off_t sector, void *buf)
780 struct gctl_req *grq;
785 grq = gctl_get_handle();
786 gctl_ro_param(grq, "verb", -1, "write MBR");
787 gctl_ro_param(grq, "class", -1, "MBR");
788 q = strrchr(disk, '/');
793 gctl_ro_param(grq, "geom", -1, q);
794 gctl_ro_param(grq, "data", secsize, buf);
800 if (!q_flag) /* GEOM errors are benign, not all devices supported */
804 error = pwrite(fd, buf, secsize, (sector * 512));
805 if (error == secsize)
808 for (i = 1; i < 5; i++) {
809 sprintf(fbuf, "%ss%d", disk, i);
810 fdw = open(fbuf, O_RDWR, 0);
813 error = ioctl(fdw, DIOCSMBR, buf);
818 warnx("Failed to write sector zero");
829 error = ioctl(fd, DIOCGFWSECTORS, &u);
831 sectors = dos_sectors = u;
833 sectors = dos_sectors = 63;
835 error = ioctl(fd, DIOCGFWHEADS, &u);
837 heads = dos_heads = u;
839 heads = dos_heads = 255;
841 dos_cylsecs = cylsecs = heads * sectors;
842 disksecs = cyls * heads * sectors;
844 error = ioctl(fd, DIOCGSECTORSIZE, &u);
845 if (error != 0 || u == 0)
850 error = ioctl(fd, DIOCGMEDIASIZE, &o);
853 cyls = dos_cyls = o / (u * dos_heads * dos_sectors);
865 mboot.bootinst_size = secsize;
866 if (mboot.bootinst != NULL)
867 free(mboot.bootinst);
868 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) {
869 warnx("unable to allocate buffer to read fdisk "
873 if (read_disk(0, mboot.bootinst) == -1) {
874 warnx("can't read fdisk partition table");
877 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) {
878 warnx("invalid fdisk partition table found");
879 /* So should we initialize things */
882 for (i = 0; i < NDOSPART; i++)
884 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
898 for(i = 0; i < NDOSPART; i++)
899 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
901 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
902 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++)
903 if (write_disk(sector,
904 &mboot.bootinst[sector * secsize]) == -1) {
905 warn("can't write fdisk partition table");
915 printf("%s [n] ", str);
917 if (fgets(lbuf, LBUF, stdin) == NULL)
919 lbuf[strlen(lbuf)-1] = 0;
922 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") ||
923 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y")))
930 decimal(const char *str, int *num, int deflt)
936 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt);
938 if (fgets(lbuf, LBUF, stdin) == NULL)
940 lbuf[strlen(lbuf)-1] = 0;
946 while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
949 while ((c = *cp++)) {
950 if (c <= '9' && c >= '0')
951 acc = acc * 10 + c - '0';
955 if (c == ' ' || c == '\t')
956 while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
961 printf("%s is an invalid decimal number. Try again.\n",
970 int numentries = (sizeof(part_types)/sizeof(struct part_type));
972 struct part_type *ptr = part_types;
975 while(counter < numentries) {
976 if(ptr->type == type)
986 parse_config_line(char *line, CMD *command)
992 memset(command, 0, sizeof(*command));
994 while (isspace(*cp)) ++cp;
995 if (*cp == '\0' || *cp == '#')
997 command->cmd = *cp++;
1003 while (isspace(*cp)) ++cp;
1005 break; /* found comment */
1007 command->args[command->n_args].argtype = *cp++;
1009 break; /* assume end of line */
1011 command->args[command->n_args].arg_val = strtol(cp, &end, 0);
1013 break; /* couldn't parse number */
1023 process_geometry(CMD *command)
1029 if (part_processed) {
1031 "ERROR line %d: the geometry specification line must occur before\n\
1032 all partition specifications",
1033 current_line_number);
1037 if (command->n_args != 3) {
1038 warnx("ERROR line %d: incorrect number of geometry args",
1039 current_line_number);
1046 for (i = 0; i < 3; ++i) {
1047 switch (command->args[i].argtype) {
1049 dos_cyls = command->args[i].arg_val;
1052 dos_heads = command->args[i].arg_val;
1055 dos_sectors = command->args[i].arg_val;
1059 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)",
1060 current_line_number, command->args[i].argtype,
1061 command->args[i].argtype);
1069 dos_cylsecs = dos_heads * dos_sectors;
1072 * Do sanity checks on parameter values
1074 if (dos_cyls == 0) {
1075 warnx("ERROR line %d: number of cylinders not specified",
1076 current_line_number);
1079 if (dos_cyls > 1024) {
1081 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\
1082 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\
1083 is dedicated to FreeBSD)",
1084 current_line_number, dos_cyls);
1087 if (dos_heads == 0) {
1088 warnx("ERROR line %d: number of heads not specified",
1089 current_line_number);
1091 } else if (dos_heads > 256) {
1092 warnx("ERROR line %d: number of heads must be within (1-256)",
1093 current_line_number);
1097 if (dos_sectors == 0) {
1098 warnx("ERROR line %d: number of sectors not specified",
1099 current_line_number);
1101 } else if (dos_sectors > 63) {
1102 warnx("ERROR line %d: number of sectors must be within (1-63)",
1103 current_line_number);
1114 process_partition(CMD *command)
1116 int status = 0, partition;
1117 u_int32_t prev_head_boundary, prev_cyl_boundary;
1118 u_int32_t adj_size, max_end;
1119 struct dos_partition *partp;
1123 if (command->n_args != 4) {
1124 warnx("ERROR line %d: incorrect number of partition args",
1125 current_line_number);
1128 partition = command->args[0].arg_val;
1129 if (partition < 1 || partition > 4) {
1130 warnx("ERROR line %d: invalid partition number %d",
1131 current_line_number, partition);
1134 partp = ((struct dos_partition *) &mboot.parts) + partition - 1;
1135 bzero((char *)partp, sizeof (struct dos_partition));
1136 partp->dp_typ = command->args[1].arg_val;
1137 partp->dp_start = command->args[2].arg_val;
1138 partp->dp_size = command->args[3].arg_val;
1139 max_end = partp->dp_start + partp->dp_size;
1141 if (partp->dp_typ == 0) {
1143 * Get out, the partition is marked as unused.
1146 * Insure that it's unused.
1148 bzero((char *)partp, sizeof (struct dos_partition));
1154 * Adjust start upwards, if necessary, to fall on a head boundary.
1156 if (partp->dp_start % dos_sectors != 0) {
1157 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors;
1158 if (max_end < dos_sectors ||
1159 prev_head_boundary > max_end - dos_sectors) {
1161 * Can't go past end of partition
1164 "ERROR line %d: unable to adjust start of partition %d to fall on\n\
1166 current_line_number, partition);
1170 "WARNING: adjusting start offset of partition %d\n\
1171 from %u to %u, to fall on a head boundary",
1172 partition, (u_int)partp->dp_start,
1173 (u_int)(prev_head_boundary + dos_sectors));
1174 partp->dp_start = prev_head_boundary + dos_sectors;
1178 * Adjust size downwards, if necessary, to fall on a cylinder
1182 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs;
1183 if (prev_cyl_boundary > partp->dp_start)
1184 adj_size = prev_cyl_boundary - partp->dp_start;
1187 "ERROR: could not adjust partition to start on a head boundary\n\
1188 and end on a cylinder boundary.");
1191 if (adj_size != partp->dp_size) {
1193 "WARNING: adjusting size of partition %d from %u to %u\n\
1194 to end on a cylinder boundary",
1195 partition, (u_int)partp->dp_size, (u_int)adj_size);
1196 partp->dp_size = adj_size;
1198 if (partp->dp_size == 0) {
1199 warnx("ERROR line %d: size of partition %d is zero",
1200 current_line_number, partition);
1213 process_active(CMD *command)
1215 int status = 0, partition, i;
1216 struct dos_partition *partp;
1219 active_processed = 1;
1220 if (command->n_args != 1) {
1221 warnx("ERROR line %d: incorrect number of active args",
1222 current_line_number);
1226 partition = command->args[0].arg_val;
1227 if (partition < 1 || partition > 4) {
1228 warnx("ERROR line %d: invalid partition number %d",
1229 current_line_number, partition);
1233 * Reset active partition
1235 partp = ((struct dos_partition *) &mboot.parts);
1236 for (i = 0; i < NDOSPART; i++)
1237 partp[i].dp_flag = 0;
1238 partp[partition-1].dp_flag = ACTIVE;
1248 process_line(char *line)
1254 parse_config_line(line, &command);
1255 switch (command.cmd) {
1258 * Comment or blank line
1265 status = process_geometry(&command);
1268 status = process_partition(&command);
1271 status = process_active(&command);
1284 read_config(char *config_file)
1291 if (strcmp(config_file, "-") != 0) {
1293 * We're not reading from stdin
1295 if ((fp = fopen(config_file, "r")) == NULL) {
1302 current_line_number = 0;
1304 if (fgets(buf, sizeof(buf), fp) == NULL)
1306 ++current_line_number;
1307 status = process_line(buf);
1315 * It doesn't matter if we're reading from stdin, as we've reached EOF
1327 struct dos_partition *partp;
1330 for (i = 0; i < 4; ++i) {
1331 partp = ((struct dos_partition *) &mboot.parts) + i;
1332 bzero((char *)partp, sizeof (struct dos_partition));
1337 sanitize_partition(struct dos_partition *partp)
1339 u_int32_t prev_head_boundary, prev_cyl_boundary;
1340 u_int32_t max_end, size, start;
1342 start = partp->dp_start;
1343 size = partp->dp_size;
1344 max_end = start + size;
1345 /* Only allow a zero size if the partition is being marked unused. */
1347 if (start == 0 && partp->dp_typ == 0)
1349 warnx("ERROR: size of partition is zero");
1352 /* Return if no adjustment is necessary. */
1353 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0)
1357 warnx("WARNING: partition overlaps with partition table");
1358 if (ok("Correct this automatically?"))
1359 start = dos_sectors;
1361 if (start % dos_sectors != 0)
1362 warnx("WARNING: partition does not start on a head boundary");
1363 if ((start +size) % dos_sectors != 0)
1364 warnx("WARNING: partition does not end on a cylinder boundary");
1365 warnx("WARNING: this may confuse the BIOS or some operating systems");
1366 if (!ok("Correct this automatically?"))
1370 * Adjust start upwards, if necessary, to fall on a head boundary.
1372 if (start % dos_sectors != 0) {
1373 prev_head_boundary = start / dos_sectors * dos_sectors;
1374 if (max_end < dos_sectors ||
1375 prev_head_boundary >= max_end - dos_sectors) {
1377 * Can't go past end of partition
1380 "ERROR: unable to adjust start of partition to fall on a head boundary");
1383 start = prev_head_boundary + dos_sectors;
1387 * Adjust size downwards, if necessary, to fall on a cylinder
1390 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs;
1391 if (prev_cyl_boundary > start)
1392 size = prev_cyl_boundary - start;
1394 warnx("ERROR: could not adjust partition to start on a head boundary\n\
1395 and end on a cylinder boundary.");
1399 /* Finally, commit any changes to partp and return. */
1400 if (start != partp->dp_start) {
1401 warnx("WARNING: adjusting start offset of partition to %u",
1403 partp->dp_start = start;
1405 if (size != partp->dp_size) {
1406 warnx("WARNING: adjusting size of partition to %u", (u_int)size);
1407 partp->dp_size = size;
1414 * Try figuring out the root device's canonical disk name.
1415 * The following choices are considered:
1416 * /dev/ad0s1a => /dev/ad0
1417 * /dev/da0a => /dev/da0
1418 * /dev/vinum/root => /dev/vinum/root
1423 struct statfs rootfs;
1426 regmatch_t rm[NMATCHES];
1430 if (statfs("/", &rootfs) == -1)
1431 err(1, "statfs(\"/\")");
1433 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]+)([sp][0-9]+)?[a-h]?$",
1434 REG_EXTENDED)) != 0)
1435 errx(1, "regcomp() failed (%d)", rv);
1436 if ((rv = regexec(&re, rootfs.f_mntfromname, NMATCHES, rm, 0)) != 0)
1438 "mounted root fs resource doesn't match expectations (regexec returned %d)",
1440 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL)
1441 errx(1, "out of memory");
1442 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so,
1443 rm[1].rm_eo - rm[1].rm_so);
1444 s[rm[1].rm_eo - rm[1].rm_so] = 0;