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>
52 #define NO_DISK_SECTORS ((u_int32_t)-1)
53 #define NO_TRACK_CYLINDERS 1023
54 #define NO_TRACK_HEADS 255
55 #define NO_TRACK_SECTORS 63
57 static char lbuf[LBUF];
61 * Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992
63 * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University
64 * Copyright (c) 1989 Robert. V. Baron
68 #define Decimal(str, ans, tmp, maxval) if (decimal(str, &tmp, ans, maxval)) ans = tmp
70 #define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs)
72 #define MAX_SEC_SIZE 2048 /* maximum section size that is supported */
73 #define MIN_SEC_SIZE 512 /* the sector size to start sensing at */
74 static int secsize = 0; /* the sensed sector size */
78 static int cyls, sectors, heads, cylsecs, disksecs;
81 unsigned char *bootinst; /* boot code */
83 struct dos_partition parts[NDOSPART];
86 static struct mboot mboot;
92 static uint dos_heads;
93 static uint dos_sectors;
94 static uint dos_cylsecs;
96 #define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0))
97 #define DOSCYL(c) (c & 0xff)
101 static int current_line_number;
103 static int geom_processed = 0;
104 static int part_processed = 0;
105 static int active_processed = 0;
112 unsigned long arg_val;
117 static int B_flag = 0; /* replace boot code */
118 static int I_flag = 0; /* use entire disk for FreeBSD */
119 static int a_flag = 0; /* set active partition */
120 static char *b_flag = NULL; /* path to boot code */
121 static int i_flag = 0; /* replace partition data */
122 static int q_flag = 0; /* Be quiet */
123 static int u_flag = 0; /* update partition data */
124 static int s_flag = 0; /* Print a summary and exit */
125 static int t_flag = 0; /* test only */
126 static char *f_flag = NULL; /* Read config info from file */
127 static int v_flag = 0; /* Be verbose */
128 static int print_config_flag = 0;
131 * A list of partition types, probably outdated.
133 static const char *const part_types[256] = {
135 [0x01] = "Primary DOS with 12 bit FAT",
136 [0x02] = "XENIX / file system",
137 [0x03] = "XENIX /usr file system",
138 [0x04] = "Primary DOS with 16 bit FAT (< 32MB)",
139 [0x05] = "Extended DOS",
140 [0x06] = "Primary DOS, 16 bit FAT (>= 32MB)",
141 [0x07] = "NTFS, OS/2 HPFS, QNX-2 (16 bit) or Advanced UNIX",
142 [0x08] = "AIX file system or SplitDrive",
143 [0x09] = "AIX boot partition or Coherent",
144 [0x0A] = "OS/2 Boot Manager, OPUS or Coherent swap",
145 [0x0B] = "DOS or Windows 95 with 32 bit FAT",
146 [0x0C] = "DOS or Windows 95 with 32 bit FAT (LBA)",
147 [0x0E] = "Primary 'big' DOS (>= 32MB, LBA)",
148 [0x0F] = "Extended DOS (LBA)",
150 [0x11] = "OS/2 BM: hidden DOS with 12-bit FAT",
151 [0x12] = "Compaq diagnostics",
152 [0x14] = "OS/2 BM: hidden DOS with 16-bit FAT (< 32MB)",
153 [0x16] = "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)",
154 [0x17] = "OS/2 BM: hidden IFS (e.g. HPFS)",
155 [0x18] = "AST Windows swapfile",
156 [0x1b] = "ASUS Recovery partition (NTFS)",
158 [0x3C] = "PartitionMagic recovery",
160 [0x40] = "VENIX 286",
161 [0x41] = "Linux/MINIX (sharing disk with DRDOS)",
162 [0x42] = "SFS or Linux swap (sharing disk with DRDOS)",
163 [0x43] = "Linux native (sharing disk with DRDOS)",
164 [0x4D] = "QNX 4.2 Primary",
165 [0x4E] = "QNX 4.2 Secondary",
166 [0x4F] = "QNX 4.2 Tertiary",
167 [0x50] = "DM (disk manager)",
168 [0x51] = "DM6 Aux1 (or Novell)",
169 [0x52] = "CP/M or Microport SysV/AT",
172 [0x55] = "EZ-Drive (disk manager)",
173 [0x56] = "Golden Bow (disk manager)",
174 [0x5c] = "Priam Edisk (disk manager)", /* according to S. Widlake */
175 [0x61] = "SpeedStor",
176 [0x63] = "System V/386 (such as ISC UNIX), GNU HURD or Mach",
177 [0x64] = "Novell Netware/286 2.xx",
178 [0x65] = "Novell Netware/386 3.xx",
179 [0x70] = "DiskSecure Multi-Boot",
182 [0x78] = "QNX4.x 2nd part",
183 [0x79] = "QNX4.x 3rd part",
184 [0x80] = "Minix until 1.4a",
185 [0x81] = "Minix since 1.4b, early Linux partition or Mitac disk manager",
186 [0x82] = "Linux swap or Solaris x86",
187 [0x83] = "Linux native",
188 [0x84] = "OS/2 hidden C: drive",
189 [0x85] = "Linux extended",
190 [0x86] = "NTFS volume set??",
191 [0x87] = "NTFS volume set??",
192 [0x93] = "Amoeba file system",
193 [0x94] = "Amoeba bad block table",
195 [0xA0] = "Suspend to Disk",
196 [0xA5] = "FreeBSD/NetBSD/386BSD",
202 [0xB7] = "BSDI BSD/386 file system",
203 [0xB8] = "BSDI BSD/386 swap",
204 [0xBE] = "Solaris x86 boot",
205 [0xBF] = "Solaris x86 (new)",
206 [0xC1] = "DRDOS/sec with 12-bit FAT",
207 [0xC4] = "DRDOS/sec with 16-bit FAT (< 32MB)",
208 [0xC6] = "DRDOS/sec with 16-bit FAT (>= 32MB)",
210 [0xDB] = "CP/M, Concurrent CP/M, Concurrent DOS or CTOS",
211 [0xDE] = "DELL Utilities - FAT filesystem",
212 [0xE1] = "DOS access or SpeedStor with 12-bit FAT extended partition",
213 [0xE3] = "DOS R/O or SpeedStor",
214 [0xE4] = "SpeedStor with 16-bit FAT extended partition < 1024 cyl.",
215 [0xEB] = "BeOS file system",
217 [0xEF] = "EFI System Partition",
218 [0xF1] = "SpeedStor",
219 [0xF2] = "DOS 3.3+ Secondary",
220 [0xF4] = "SpeedStor large partition",
221 [0xFE] = "SpeedStor >1024 cyl. or LANstep",
222 [0xFF] = "Xenix bad blocks table",
230 ret = (t >= 0 && t <= 255) ? part_types[t] : NULL;
231 return ret ? ret : "unknown";
235 static void print_s0(void);
236 static void print_part(const struct dos_partition *);
237 static void init_sector0(unsigned long start);
238 static void init_boot(void);
239 static void change_part(int i);
240 static void print_params(void);
241 static void change_active(int which);
242 static void change_code(void);
243 static void get_params_to_use(void);
244 static char *get_rootdisk(void);
245 static void dos(struct dos_partition *partp);
246 static int open_disk(int flag);
247 static ssize_t read_disk(off_t sector, void *buf);
248 static int write_disk(off_t sector, void *buf);
249 static int get_params(void);
250 static int read_s0(void);
251 static int write_s0(void);
252 static int ok(const char *str);
253 static int decimal(const char *str, int *num, int deflt, uint32_t maxval);
254 static int read_config(char *config_file);
255 static void reset_boot(void);
256 static int sanitize_partition(struct dos_partition *);
257 static void usage(void);
260 main(int argc, char *argv[])
264 struct dos_partition *partp;
266 while ((c = getopt(argc, argv, "BIab:f:ipqstuv1234")) != -1)
287 print_config_flag = 1;
313 if (f_flag || i_flag)
321 disk = get_rootdisk();
323 disk = g_device_path(argv[0]);
325 err(1, "unable to get correct path for %s", argv[0]);
327 if (open_disk(u_flag) < 0)
328 err(1, "cannot open disk %s", disk);
330 /* (abu)use mboot.bootinst to probe for the sector size */
331 if ((mboot.bootinst = malloc(MAX_SEC_SIZE)) == NULL)
332 err(1, "cannot allocate buffer to determine disk sector size");
333 if (read_disk(0, mboot.bootinst) == -1)
334 errx(1, "could not detect sector size");
335 free(mboot.bootinst);
336 mboot.bootinst = NULL;
338 if (print_config_flag) {
342 printf("# %s\n", disk);
343 printf("g c%d h%d s%d\n", dos_cyls, dos_heads, dos_sectors);
345 for (i = 0; i < NDOSPART; i++) {
346 partp = &mboot.parts[i];
348 if (partp->dp_start == 0 && partp->dp_size == 0)
351 printf("p %d 0x%02x %lu %lu\n", i + 1, partp->dp_typ,
352 (u_long)partp->dp_start, (u_long)partp->dp_size);
354 /* Fill flags for the partition. */
355 if (partp->dp_flag & 0x80)
356 printf("a %d\n", i + 1);
363 printf("%s: %d cyl %d hd %d sec\n", disk, dos_cyls, dos_heads,
365 printf("Part %11s %11s Type Flags\n", "Start", "Size");
366 for (i = 0; i < NDOSPART; i++) {
367 partp = &mboot.parts[i];
368 if (partp->dp_start == 0 && partp->dp_size == 0)
370 printf("%4d: %11lu %11lu 0x%02x 0x%02x\n", i + 1,
371 (u_long) partp->dp_start,
372 (u_long) partp->dp_size, partp->dp_typ,
378 printf("******* Working on device %s *******\n",disk);
383 partp = &mboot.parts[0];
384 partp->dp_typ = DOSPTYP_386BSD;
385 partp->dp_flag = ACTIVE;
386 partp->dp_start = dos_sectors;
387 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs -
397 if (read_s0() || i_flag)
399 if (!read_config(f_flag))
412 init_sector0(dos_sectors);
414 printf("Media sector size is %d\n", secsize);
415 printf("Warning: BIOS sector numbering starts with sector 1\n");
416 printf("Information from DOS bootblock is:\n");
418 for (i = 1; i <= NDOSPART; i++)
421 change_part(partition);
423 if (u_flag || a_flag)
424 change_active(partition);
429 if (u_flag || a_flag || B_flag) {
431 printf("\nWe haven't changed the partition table yet. ");
432 printf("This is your last chance.\n");
436 if (ok("Should we write new partition table?"))
439 printf("\n-t flag specified -- partition table not written.\n");
450 fprintf(stderr, "%s%s",
451 "usage: fdisk [-BIaipqstu] [-b bootcode] [-1234] [disk]\n",
452 " fdisk -f configfile [-itv] [disk]\n");
462 printf("Information from DOS bootblock is:\n");
463 for (i = 1; i <= NDOSPART; i++) {
465 print_part(&mboot.parts[i - 1]);
469 static struct dos_partition mtpart;
472 print_part(const struct dos_partition *partp)
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)
517 errx(1, "%s is empty, must not be.", fname);
518 if ((mboot.bootinst_size = sb.st_size) % secsize != 0)
519 errx(1, "%s: length must be a multiple of sector size", fname);
520 if (mboot.bootinst != NULL)
521 free(mboot.bootinst);
522 if ((mboot.bootinst = malloc(mboot.bootinst_size = sb.st_size)) == NULL)
523 errx(1, "%s: unable to allocate read buffer", fname);
524 if ((n = read(fdesc, mboot.bootinst, mboot.bootinst_size)) == -1 ||
527 if (n != mboot.bootinst_size)
528 errx(1, "%s: short read", fname);
530 if (mboot.bootinst != NULL)
531 free(mboot.bootinst);
532 mboot.bootinst_size = secsize;
533 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL)
534 errx(1, "unable to allocate boot block buffer");
535 memset(mboot.bootinst, 0, mboot.bootinst_size);
536 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
542 init_sector0(unsigned long start)
544 struct dos_partition *partp = &mboot.parts[0];
548 partp->dp_typ = DOSPTYP_386BSD;
549 partp->dp_flag = ACTIVE;
550 start = ((start + dos_sectors - 1) / dos_sectors) * dos_sectors;
553 partp->dp_start = start;
554 partp->dp_size = (disksecs / dos_cylsecs) * dos_cylsecs - start;
562 struct dos_partition *partp = &mboot.parts[i - 1];
564 printf("The data for partition %d is:\n", i);
567 if (u_flag && ok("Do you want to change it?")) {
571 bzero(partp, sizeof (*partp));
574 printf("\nThe static data for the slice 1 has been reinitialized to:\n");
580 Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp, 255);
581 Decimal("start", partp->dp_start, tmp, NO_DISK_SECTORS);
582 Decimal("size", partp->dp_size, tmp, NO_DISK_SECTORS);
583 if (!sanitize_partition(partp)) {
584 warnx("ERROR: failed to adjust; setting sysid to 0");
588 if (ok("Explicitly specify beg/end address ?"))
591 tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect);
593 tsec = DPSECT(partp->dp_ssect);
594 Decimal("beginning cylinder", tcyl, tmp, NO_TRACK_CYLINDERS);
595 Decimal("beginning head", thd, tmp, NO_TRACK_HEADS);
596 Decimal("beginning sector", tsec, tmp, NO_TRACK_SECTORS);
597 partp->dp_scyl = DOSCYL(tcyl);
598 partp->dp_ssect = DOSSECT(tsec,tcyl);
601 tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect);
603 tsec = DPSECT(partp->dp_esect);
604 Decimal("ending cylinder", tcyl, tmp, NO_TRACK_CYLINDERS);
605 Decimal("ending head", thd, tmp, NO_TRACK_HEADS);
606 Decimal("ending sector", tsec, tmp, NO_TRACK_SECTORS);
607 partp->dp_ecyl = DOSCYL(tcyl);
608 partp->dp_esect = DOSSECT(tsec,tcyl);
614 } while (!ok("Are we happy with this entry?"));
621 printf("parameters extracted from in-core disklabel are:\n");
622 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
623 ,cyls,heads,sectors,cylsecs);
624 if (dos_cyls > 1023 || dos_heads > 255 || dos_sectors > 63)
625 printf("Figures below won't work with BIOS for partitions not in cyl 1\n");
626 printf("parameters to be used for BIOS calculations are:\n");
627 printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
628 ,dos_cyls,dos_heads,dos_sectors,dos_cylsecs);
632 change_active(int which)
634 struct dos_partition *partp = &mboot.parts[0];
635 int active, i, new, tmp;
638 for (i = 0; i < NDOSPART; i++) {
639 if ((partp[i].dp_flag & ACTIVE) == 0)
641 printf("Partition %d is marked active\n", i + 1);
645 if (a_flag && which != -1)
647 else if (active == -1)
650 if (!ok("Do you want to change the active partition?"))
655 Decimal("active partition", new, tmp, 0);
656 if (new < 1 || new > 4) {
657 printf("Active partition number must be in range 1-4."
662 } while (!ok("Are you happy with this choice"));
663 for (i = 0; i < NDOSPART; i++)
664 partp[i].dp_flag = 0;
665 if (active > 0 && active <= NDOSPART)
666 partp[active-1].dp_flag = ACTIVE;
672 if (ok("Do you want to change the boot code?"))
681 if (ok("Do you want to change our idea of what BIOS thinks ?"))
685 Decimal("BIOS's idea of #cylinders", dos_cyls, tmp, 0);
686 Decimal("BIOS's idea of #heads", dos_heads, tmp, 0);
687 Decimal("BIOS's idea of #sectors", dos_sectors, tmp, 0);
688 dos_cylsecs = dos_heads * dos_sectors;
691 while(!ok("Are you happy with this choice"));
696 /***********************************************\
697 * Change real numbers into strange dos numbers *
698 \***********************************************/
700 dos(struct dos_partition *partp)
705 if (partp->dp_typ == 0 && partp->dp_start == 0 && partp->dp_size == 0) {
706 memcpy(partp, &mtpart, sizeof(*partp));
711 partp->dp_shd = partp->dp_start % dos_cylsecs / dos_sectors;
712 cy = partp->dp_start / dos_cylsecs;
713 sec = partp->dp_start % dos_sectors + 1;
714 partp->dp_scyl = DOSCYL(cy);
715 partp->dp_ssect = DOSSECT(sec, cy);
718 end = partp->dp_start + partp->dp_size - 1;
719 partp->dp_ehd = end % dos_cylsecs / dos_sectors;
720 cy = end / dos_cylsecs;
721 sec = end % dos_sectors + 1;
722 partp->dp_ecyl = DOSCYL(cy);
723 partp->dp_esect = DOSSECT(sec, cy);
731 /* Write mode if one of these flags are set. */
732 rwmode = (a_flag || I_flag || B_flag || flag);
733 fd = g_open(disk, rwmode);
734 /* If the mode fails, try read-only if we didn't. */
735 if (fd == -1 && errno == EPERM && rwmode)
736 fd = g_open(disk, 0);
737 if (fd == -1 && errno == ENXIO)
740 warnx("can't open device %s", disk);
743 if (get_params() == -1) {
744 warnx("can't get disk parameters on %s", disk);
751 read_disk(off_t sector, void *buf)
754 lseek(fd, (sector * 512), 0);
756 for (secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE;
759 int size = read(fd, buf, secsize);
761 /* it worked so return */
765 return read(fd, buf, secsize);
767 /* we failed to read at any of the sizes */
772 write_disk(off_t sector, void *buf)
775 struct gctl_req *grq;
777 char fbuf[BUFSIZ], *pname;
780 grq = gctl_get_handle();
781 gctl_ro_param(grq, "verb", -1, "write MBR");
782 gctl_ro_param(grq, "class", -1, "MBR");
783 pname = g_providername(fd);
785 warn("Error getting providername for %s", disk);
788 gctl_ro_param(grq, "geom", -1, pname);
789 gctl_ro_param(grq, "data", secsize, buf);
790 errmsg = gctl_issue(grq);
792 if (errmsg == NULL) {
796 if (!q_flag) /* GEOM errors are benign, not all devices supported */
800 error = pwrite(fd, buf, secsize, (sector * 512));
801 if (error == secsize)
804 for (i = 1; i < 5; i++) {
805 sprintf(fbuf, "%ss%d", disk, i);
806 fdw = open(fbuf, O_RDWR, 0);
809 error = ioctl(fdw, DIOCSMBR, buf);
814 warnx("Failed to write sector zero");
825 error = ioctl(fd, DIOCGFWSECTORS, &u);
827 sectors = dos_sectors = u;
829 sectors = dos_sectors = 63;
831 error = ioctl(fd, DIOCGFWHEADS, &u);
833 heads = dos_heads = u;
835 heads = dos_heads = 255;
837 dos_cylsecs = cylsecs = heads * sectors;
838 disksecs = cyls * heads * sectors;
840 u = g_sectorsize(fd);
848 cyls = dos_cyls = o / (u * dos_heads * dos_sectors);
858 mboot.bootinst_size = secsize;
859 if (mboot.bootinst != NULL)
860 free(mboot.bootinst);
861 if ((mboot.bootinst = malloc(mboot.bootinst_size)) == NULL) {
862 warnx("unable to allocate buffer to read fdisk "
866 if (read_disk(0, mboot.bootinst) == -1) {
867 warnx("can't read fdisk partition table");
870 if (le16dec(&mboot.bootinst[DOSMAGICOFFSET]) != DOSMAGIC) {
871 warnx("invalid fdisk partition table found");
872 /* So should we initialize things */
875 for (i = 0; i < NDOSPART; i++)
877 &mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
891 for(i = 0; i < NDOSPART; i++)
892 dos_partition_enc(&mboot.bootinst[DOSPARTOFF + i * DOSPARTSIZE],
894 le16enc(&mboot.bootinst[DOSMAGICOFFSET], DOSMAGIC);
895 for(sector = 0; sector < mboot.bootinst_size / secsize; sector++)
896 if (write_disk(sector,
897 &mboot.bootinst[sector * secsize]) == -1) {
898 warn("can't write fdisk partition table");
908 printf("%s [n] ", str);
910 if (fgets(lbuf, LBUF, stdin) == NULL)
912 lbuf[strlen(lbuf)-1] = 0;
915 (!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") ||
916 !strcmp(lbuf, "y") || !strcmp(lbuf, "Y")))
923 decimal(const char *str, int *num, int deflt, uint32_t maxval)
930 printf("Supply a decimal value for \"%s\" [%d] ", str, deflt);
932 if (fgets(lbuf, LBUF, stdin) == NULL)
934 lbuf[strlen(lbuf)-1] = 0;
940 while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
943 while ((c = *cp++)) {
944 if (c <= '9' && c >= '0') {
945 if (acc <= maxval || maxval == 0)
946 acc = acc * 10 + c - '0';
950 if (c == ' ' || c == '\t')
951 while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
953 if (maxval > 0 && acc > maxval) {
955 printf("%s exceeds maximum value allowed for "
956 "this field. The value has been reduced "
957 "to %lld\n", lbuf, acc);
962 printf("%s is an invalid decimal number. Try again.\n",
970 parse_config_line(char *line, CMD *command)
976 memset(command, 0, sizeof(*command));
978 while (isspace(*cp)) ++cp;
979 if (*cp == '\0' || *cp == '#')
981 command->cmd = *cp++;
987 while (isspace(*cp)) ++cp;
991 break; /* found comment */
993 command->args[command->n_args].argtype = *cp++;
995 command->args[command->n_args].arg_val = strtoul(cp, &end, 0);
996 if (cp == end || (!isspace(*end) && *end != '\0')) {
999 while (!isspace(*end) && *end != '\0') ++end;
1000 ch = *end; *end = '\0';
1001 command->args[command->n_args].arg_str = strdup(cp);
1004 command->args[command->n_args].arg_str = NULL;
1014 process_geometry(CMD *command)
1020 if (part_processed) {
1022 "ERROR line %d: the geometry specification line must occur before\n\
1023 all partition specifications",
1024 current_line_number);
1028 if (command->n_args != 3) {
1029 warnx("ERROR line %d: incorrect number of geometry args",
1030 current_line_number);
1037 for (i = 0; i < 3; ++i) {
1038 switch (command->args[i].argtype) {
1040 dos_cyls = command->args[i].arg_val;
1043 dos_heads = command->args[i].arg_val;
1046 dos_sectors = command->args[i].arg_val;
1050 "ERROR line %d: unknown geometry arg type: '%c' (0x%02x)",
1051 current_line_number, command->args[i].argtype,
1052 command->args[i].argtype);
1060 dos_cylsecs = dos_heads * dos_sectors;
1063 * Do sanity checks on parameter values
1065 if (dos_cyls == 0) {
1066 warnx("ERROR line %d: number of cylinders not specified",
1067 current_line_number);
1070 if (dos_cyls > 1024) {
1072 "WARNING line %d: number of cylinders (%d) may be out-of-range\n\
1073 (must be within 1-1024 for normal BIOS operation, unless the entire disk\n\
1074 is dedicated to FreeBSD)",
1075 current_line_number, dos_cyls);
1078 if (dos_heads == 0) {
1079 warnx("ERROR line %d: number of heads not specified",
1080 current_line_number);
1082 } else if (dos_heads > 256) {
1083 warnx("ERROR line %d: number of heads must be within (1-256)",
1084 current_line_number);
1088 if (dos_sectors == 0) {
1089 warnx("ERROR line %d: number of sectors not specified",
1090 current_line_number);
1092 } else if (dos_sectors > 63) {
1093 warnx("ERROR line %d: number of sectors must be within (1-63)",
1094 current_line_number);
1104 str2sectors(const char *str)
1109 val = strtoul(str, &end, 0);
1110 if (str == end || *end == '\0') {
1111 warnx("ERROR line %d: unexpected size: \'%s\'",
1112 current_line_number, str);
1113 return NO_DISK_SECTORS;
1117 val *= 1024UL / secsize;
1118 else if (*end == 'M')
1119 val *= 1024UL * 1024UL / secsize;
1120 else if (*end == 'G')
1121 val *= 1024UL * 1024UL * 1024UL / secsize;
1123 warnx("ERROR line %d: unexpected modifier: %c "
1124 "(not K/M/G)", current_line_number, *end);
1125 return NO_DISK_SECTORS;
1132 process_partition(CMD *command)
1134 int status = 0, partition;
1135 u_int32_t prev_head_boundary, prev_cyl_boundary;
1136 u_int32_t adj_size, max_end;
1137 struct dos_partition *partp;
1141 if (command->n_args != 4) {
1142 warnx("ERROR line %d: incorrect number of partition args",
1143 current_line_number);
1146 partition = command->args[0].arg_val;
1147 if (partition < 1 || partition > 4) {
1148 warnx("ERROR line %d: invalid partition number %d",
1149 current_line_number, partition);
1152 partp = &mboot.parts[partition - 1];
1153 bzero(partp, sizeof (*partp));
1154 partp->dp_typ = command->args[1].arg_val;
1155 if (command->args[2].arg_str != NULL) {
1156 if (strcmp(command->args[2].arg_str, "*") == 0) {
1158 partp->dp_start = dos_sectors;
1159 for (i = 1; i < partition; i++) {
1160 struct dos_partition *prev_partp;
1161 prev_partp = ((struct dos_partition *)
1162 &mboot.parts) + i - 1;
1163 if (prev_partp->dp_typ != 0)
1164 partp->dp_start = prev_partp->dp_start +
1165 prev_partp->dp_size;
1167 if (partp->dp_start % dos_sectors != 0) {
1168 prev_head_boundary = partp->dp_start /
1169 dos_sectors * dos_sectors;
1170 partp->dp_start = prev_head_boundary +
1174 partp->dp_start = str2sectors(command->args[2].arg_str);
1175 if (partp->dp_start == NO_DISK_SECTORS)
1179 partp->dp_start = command->args[2].arg_val;
1181 if (command->args[3].arg_str != NULL) {
1182 if (strcmp(command->args[3].arg_str, "*") == 0)
1183 partp->dp_size = ((disksecs / dos_cylsecs) *
1184 dos_cylsecs) - partp->dp_start;
1186 partp->dp_size = str2sectors(command->args[3].arg_str);
1187 if (partp->dp_size == NO_DISK_SECTORS)
1190 prev_cyl_boundary = ((partp->dp_start + partp->dp_size) /
1191 dos_cylsecs) * dos_cylsecs;
1192 if (prev_cyl_boundary > partp->dp_start)
1193 partp->dp_size = prev_cyl_boundary - partp->dp_start;
1195 partp->dp_size = command->args[3].arg_val;
1197 max_end = partp->dp_start + partp->dp_size;
1199 if (partp->dp_typ == 0) {
1201 * Get out, the partition is marked as unused.
1204 * Insure that it's unused.
1206 bzero(partp, sizeof(*partp));
1212 * Adjust start upwards, if necessary, to fall on a head boundary.
1214 if (partp->dp_start % dos_sectors != 0) {
1215 prev_head_boundary = partp->dp_start / dos_sectors * dos_sectors;
1216 if (max_end < dos_sectors ||
1217 prev_head_boundary > max_end - dos_sectors) {
1219 * Can't go past end of partition
1222 "ERROR line %d: unable to adjust start of partition %d to fall on\n\
1224 current_line_number, partition);
1228 "WARNING: adjusting start offset of partition %d\n\
1229 from %u to %u, to fall on a head boundary",
1230 partition, (u_int)partp->dp_start,
1231 (u_int)(prev_head_boundary + dos_sectors));
1232 partp->dp_start = prev_head_boundary + dos_sectors;
1236 * Adjust size downwards, if necessary, to fall on a cylinder
1240 ((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs;
1241 if (prev_cyl_boundary > partp->dp_start)
1242 adj_size = prev_cyl_boundary - partp->dp_start;
1245 "ERROR: could not adjust partition to start on a head boundary\n\
1246 and end on a cylinder boundary.");
1249 if (adj_size != partp->dp_size) {
1251 "WARNING: adjusting size of partition %d from %u to %u\n\
1252 to end on a cylinder boundary",
1253 partition, (u_int)partp->dp_size, (u_int)adj_size);
1254 partp->dp_size = adj_size;
1256 if (partp->dp_size == 0) {
1257 warnx("ERROR line %d: size of partition %d is zero",
1258 current_line_number, partition);
1271 process_active(CMD *command)
1273 int status = 0, partition, i;
1274 struct dos_partition *partp;
1277 active_processed = 1;
1278 if (command->n_args != 1) {
1279 warnx("ERROR line %d: incorrect number of active args",
1280 current_line_number);
1284 partition = command->args[0].arg_val;
1285 if (partition < 1 || partition > 4) {
1286 warnx("ERROR line %d: invalid partition number %d",
1287 current_line_number, partition);
1291 * Reset active partition
1293 partp = mboot.parts;
1294 for (i = 0; i < NDOSPART; i++)
1295 partp[i].dp_flag = 0;
1296 partp[partition-1].dp_flag = ACTIVE;
1306 process_line(char *line)
1312 parse_config_line(line, &command);
1313 switch (command.cmd) {
1316 * Comment or blank line
1323 status = process_geometry(&command);
1326 status = process_partition(&command);
1329 status = process_active(&command);
1342 read_config(char *config_file)
1349 if (strcmp(config_file, "-") != 0) {
1351 * We're not reading from stdin
1353 if ((fp = fopen(config_file, "r")) == NULL) {
1360 current_line_number = 0;
1362 if (fgets(buf, sizeof(buf), fp) == NULL)
1364 ++current_line_number;
1365 status = process_line(buf);
1373 * It doesn't matter if we're reading from stdin, as we've reached EOF
1385 struct dos_partition *partp;
1388 for (i = 0; i < 4; ++i) {
1389 partp = &mboot.parts[i];
1390 bzero(partp, sizeof(*partp));
1395 sanitize_partition(struct dos_partition *partp)
1397 u_int32_t prev_head_boundary, prev_cyl_boundary;
1398 u_int32_t max_end, size, start;
1400 start = partp->dp_start;
1401 size = partp->dp_size;
1402 max_end = start + size;
1403 /* Only allow a zero size if the partition is being marked unused. */
1405 if (start == 0 && partp->dp_typ == 0)
1407 warnx("ERROR: size of partition is zero");
1410 /* Return if no adjustment is necessary. */
1411 if (start % dos_sectors == 0 && (start + size) % dos_sectors == 0)
1415 warnx("WARNING: partition overlaps with partition table");
1416 if (ok("Correct this automatically?"))
1417 start = dos_sectors;
1419 if (start % dos_sectors != 0)
1420 warnx("WARNING: partition does not start on a head boundary");
1421 if ((start +size) % dos_sectors != 0)
1422 warnx("WARNING: partition does not end on a cylinder boundary");
1423 warnx("WARNING: this may confuse the BIOS or some operating systems");
1424 if (!ok("Correct this automatically?"))
1428 * Adjust start upwards, if necessary, to fall on a head boundary.
1430 if (start % dos_sectors != 0) {
1431 prev_head_boundary = start / dos_sectors * dos_sectors;
1432 if (max_end < dos_sectors ||
1433 prev_head_boundary >= max_end - dos_sectors) {
1435 * Can't go past end of partition
1438 "ERROR: unable to adjust start of partition to fall on a head boundary");
1441 start = prev_head_boundary + dos_sectors;
1445 * Adjust size downwards, if necessary, to fall on a cylinder
1448 prev_cyl_boundary = ((start + size) / dos_cylsecs) * dos_cylsecs;
1449 if (prev_cyl_boundary > start)
1450 size = prev_cyl_boundary - start;
1452 warnx("ERROR: could not adjust partition to start on a head boundary\n\
1453 and end on a cylinder boundary.");
1457 /* Finally, commit any changes to partp and return. */
1458 if (start != partp->dp_start) {
1459 warnx("WARNING: adjusting start offset of partition to %u",
1461 partp->dp_start = start;
1463 if (size != partp->dp_size) {
1464 warnx("WARNING: adjusting size of partition to %u", (u_int)size);
1465 partp->dp_size = size;
1472 * Try figuring out the root device's canonical disk name.
1473 * The following choices are considered:
1474 * /dev/ad0s1a => /dev/ad0
1475 * /dev/da0a => /dev/da0
1476 * /dev/vinum/root => /dev/vinum/root
1477 * A ".eli" part is removed if it exists (see geli(8)).
1478 * A ".journal" ending is removed if it exists (see gjournal(8)).
1483 struct statfs rootfs;
1486 regmatch_t rm[NMATCHES];
1487 char dev[PATH_MAX], *s;
1490 if (statfs("/", &rootfs) == -1)
1491 err(1, "statfs(\"/\")");
1493 if ((rv = regcomp(&re, "^(/dev/[a-z/]+[0-9]*)([sp][0-9]+)?[a-h]?(\\.journal)?$",
1494 REG_EXTENDED)) != 0)
1495 errx(1, "regcomp() failed (%d)", rv);
1496 strlcpy(dev, rootfs.f_mntfromname, sizeof (dev));
1497 if ((s = strstr(dev, ".eli")) != NULL)
1498 memmove(s, s+4, strlen(s + 4) + 1);
1500 if ((rv = regexec(&re, dev, NMATCHES, rm, 0)) != 0)
1502 "mounted root fs resource doesn't match expectations (regexec returned %d)",
1504 if ((s = malloc(rm[1].rm_eo - rm[1].rm_so + 1)) == NULL)
1505 errx(1, "out of memory");
1506 memcpy(s, rootfs.f_mntfromname + rm[1].rm_so,
1507 rm[1].rm_eo - rm[1].rm_so);
1508 s[rm[1].rm_eo - rm[1].rm_so] = 0;