/* $NetBSD: fdisk.c,v 1.22 1997/12/22 01:54:07 enami Exp $ */ /* * Mach Operating System * Copyright (c) 1992 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ #include #ifndef lint __RCSID("$NetBSD: fdisk.c,v 1.22 1997/12/22 01:54:07 enami Exp $"); #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define LBUF 100 static char lbuf[LBUF]; /* * 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University * Copyright (c) 1989 Robert. V. Baron * Created. */ char *disk = "/dev/rwd0d"; struct disklabel disklabel; /* disk parameters */ int cylinders, sectors, heads, cylindersectors, disksectors; struct mboot { unsigned char padding[2]; /* force the longs to be long alligned */ unsigned char bootinst[DOSPARTOFF]; struct dos_partition parts[4]; unsigned short int signature; }; struct mboot mboot; #define ACTIVE 0x80 #define BOOT_MAGIC 0xAA55 int dos_cylinders; int dos_heads; int dos_sectors; int dos_cylindersectors; #define DOSSECT(s,c) (((s) & 0x3f) | (((c) >> 2) & 0xc0)) #define DOSCYL(c) ((c) & 0xff) int partition = -1; int a_flag; /* set active partition */ int i_flag; /* replace partition data */ int u_flag; /* update partition data */ int sh_flag; /* Output data as shell defines */ int f_flag; /* force --not interactive */ int s_flag; /* set id,offset,size */ int b_flag; /* Set cyl, heads, secs (as c/h/s) */ int b_cyl, b_head, b_sec; /* b_flag values. */ unsigned char bootcode[] = { 0x33, 0xc0, 0xfa, 0x8e, 0xd0, 0xbc, 0x00, 0x7c, 0x8e, 0xc0, 0x8e, 0xd8, 0xfb, 0x8b, 0xf4, 0xbf, 0x00, 0x06, 0xb9, 0x00, 0x02, 0xfc, 0xf3, 0xa4, 0xea, 0x1d, 0x06, 0x00, 0x00, 0xb0, 0x04, 0xbe, 0xbe, 0x07, 0x80, 0x3c, 0x80, 0x74, 0x0c, 0x83, 0xc6, 0x10, 0xfe, 0xc8, 0x75, 0xf4, 0xbe, 0xbd, 0x06, 0xeb, 0x43, 0x8b, 0xfe, 0x8b, 0x14, 0x8b, 0x4c, 0x02, 0x83, 0xc6, 0x10, 0xfe, 0xc8, 0x74, 0x0a, 0x80, 0x3c, 0x80, 0x75, 0xf4, 0xbe, 0xbd, 0x06, 0xeb, 0x2b, 0xbd, 0x05, 0x00, 0xbb, 0x00, 0x7c, 0xb8, 0x01, 0x02, 0xcd, 0x13, 0x73, 0x0c, 0x33, 0xc0, 0xcd, 0x13, 0x4d, 0x75, 0xef, 0xbe, 0x9e, 0x06, 0xeb, 0x12, 0x81, 0x3e, 0xfe, 0x7d, 0x55, 0xaa, 0x75, 0x07, 0x8b, 0xf7, 0xea, 0x00, 0x7c, 0x00, 0x00, 0xbe, 0x85, 0x06, 0x2e, 0xac, 0x0a, 0xc0, 0x74, 0x06, 0xb4, 0x0e, 0xcd, 0x10, 0xeb, 0xf4, 0xfb, 0xeb, 0xfe, 'M', 'i', 's', 's', 'i', 'n', 'g', ' ', 'o', 'p', 'e', 'r', 'a', 't', 'i', 'n', 'g', ' ', 's', 'y', 's', 't', 'e', 'm', 0, 'E', 'r', 'r', 'o', 'r', ' ', 'l', 'o', 'a', 'd', 'i', 'n', 'g', ' ', 'o', 'p', 'e', 'r', 'a', 't', 'i', 'n', 'g', ' ', 's', 'y', 's', 't', 'e', 'm', 0, 'I', 'n', 'v', 'a', 'l', 'i', 'd', ' ', 'p', 'a', 'r', 't', 'i', 't', 'i', 'o', 'n', ' ', 't', 'a', 'b', 'l', 'e', 0, 'A', 'u', 't', 'h', 'o', 'r', ' ', '-', ' ', 'S', 'i', 'e', 'g', 'm', 'a', 'r', ' ', 'S', 'c', 'h', 'm', 'i', 'd', 't', 0,0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; struct part_type { int type; char *name; } part_types[] = { {0x00, "unused"}, {0x01, "Primary DOS with 12 bit FAT"}, {0x02, "XENIX / filesystem"}, {0x03, "XENIX /usr filesystem"}, {0x04, "Primary DOS with 16 bit FAT <32M"}, {0x05, "Extended DOS"}, {0x06, "Primary 'big' DOS, 16-bit FAT (> 32MB)"}, {0x07, "OS/2 HPFS or NTFS or QNX2 or Advanced UNIX"}, {0x08, "AIX filesystem"}, {0x09, "AIX boot partition or Coherent"}, {0x0A, "OS/2 Boot Manager or Coherent swap or OPUS"}, {0x0E, "DOS (16-bit FAT), CHS-mapped"}, {0x0F, "Ext. partition, CHS-mapped"}, {0x10, "OPUS"}, {0x11, "OS/2 BM: hidden DOS 12-bit FAT"}, {0x12, "Compaq diagnostics"}, {0x14, "OS/2 BM: hidden DOS 16-bit FAT <32M"}, {0x16, "OS/2 BM: hidden DOS 16-bit FAT >=32M"}, {0x17, "OS/2 BM: hidden IFS"}, {0x18, "AST Windows swapfile"}, {0x24, "NEC DOS"}, {0x3C, "PartitionMagic recovery"}, {0x40, "VENIX 286"}, {0x41, "Linux/MINIX (sharing disk with DRDOS)"}, {0x42, "SFS or Linux swap (sharing disk with DRDOS)"}, {0x43, "Linux native (sharing disk with DRDOS)"}, {0x50, "DM (disk manager)"}, {0x51, "DM6 Aux1 (or Novell)"}, {0x52, "CP/M or Microport SysV/AT"}, {0x53, "DM6 Aux3"}, {0x54, "DM6"}, {0x55, "EZ-Drive (disk manager)"}, {0x56, "Golden Bow (disk manager)"}, {0x5C, "Priam Edisk (disk manager)"}, {0x61, "SpeedStor"}, {0x63, "GNU HURD or Mach or Sys V/386 (such as ISC UNIX)"}, {0x64, "Novell Netware 2.xx"}, {0x65, "Novell Netware 3.xx"}, {0x70, "DiskSecure Multi-Boot"}, {0x75, "PC/IX"}, {0x77, "QNX4.x"}, {0x78, "QNX4.x 2nd part"}, {0x79, "QNX4.x 3rd part"}, {0x80, "MINIX until 1.4a"}, {0x81, "MINIX since 1.4b, early Linux, Mitac dmgr"}, {0x82, "Linux swap"}, {0x83, "Linux native"}, {0x84, "OS/2 hidden C: drive"}, {0x85, "Linux extended"}, {0x86, "NTFS volume set??"}, {0x87, "NTFS volume set??"}, {0x93, "Amoeba filesystem"}, {0x94, "Amoeba bad block table"}, {0xA0, "IBM Thinkpad hibernation"}, {0xA5, "NetBSD or FreeBSD or 386BSD"}, {0xA6, "OpenBSD"}, {0xA7, "NeXTSTEP 486"}, {0xB7, "BSDI BSD/386 filesystem"}, {0xB8, "BSDI BSD/386 swap"}, {0xC1, "DRDOS/sec (FAT-12)"}, {0xC4, "DRDOS/sec (FAT-16, < 32M)"}, {0xC6, "DRDOS/sec (FAT-16, >= 32M)"}, {0xC7, "Syrinx"}, {0xDB, "CP/M or Concurrent CP/M or Concurrent DOS or CTOS"}, {0xE1, "DOS access or SpeedStor 12-bit FAT extended partition"}, {0xE3, "DOS R/O or SpeedStor"}, {0xE4, "SpeedStor 16-bit FAT extended partition < 1024 cyl."}, {0xF1, "SpeedStor"}, {0xF2, "DOS 3.3+ Secondary"}, {0xF4, "SpeedStor large partition"}, {0xFE, "SpeedStor >1024 cyl. or LANstep"}, {0xFF, "Xenix Bad Block Table"}, }; void usage __P((void)); void print_s0 __P((int)); void print_part __P((int)); void init_sector0 __P((int)); void intuit_translated_geometry __P((void)); int try_heads __P((quad_t, quad_t, quad_t, quad_t, quad_t, quad_t, quad_t, quad_t)); int try_sectors __P((quad_t, quad_t, quad_t, quad_t, quad_t)); void change_part __P((int, int, int, int)); void print_params __P((void)); void change_active __P((int)); void get_params_to_use __P((void)); void dos __P((int, unsigned char *, unsigned char *, unsigned char *)); int open_disk __P((int)); int read_disk __P((int, void *)); int write_disk __P((int, void *)); int get_params __P((void)); int read_s0 __P((void)); int write_s0 __P((void)); int yesno __P((char *)); void decimal __P((char *, int *)); int type_match __P((const void *, const void *)); char *get_type __P((int)); int get_mapping __P((int, int *, int *, int *, long *)); static inline unsigned short getshort __P((void *)); static inline void putshort __P((void *p, unsigned short)); static inline unsigned long getlong __P((void *)); static inline void putlong __P((void *, unsigned long)); int main __P((int, char **)); int main(argc, argv) int argc; char *argv[]; { int ch; int part; int csysid, cstart, csize; /* For the b_flag. */ a_flag = i_flag = u_flag = sh_flag = f_flag = s_flag = b_flag = 0; csysid = cstart = csize = 0; while ((ch = getopt(argc, argv, "0123Safius:b:")) != -1) switch (ch) { case '0': partition = 0; break; case '1': partition = 1; break; case '2': partition = 2; break; case '3': partition = 3; break; case 'S': sh_flag = 1; break; case 'a': a_flag = 1; break; case 'f': f_flag = 1; break; case 'i': i_flag = 1; break; case 'u': u_flag = 1; break; case 's': s_flag = 1; if (sscanf (optarg, "%d/%d/%d", &csysid, &cstart, &csize) != 3) { (void)fprintf (stderr, "%s: Bad argument " "to the -s flag.\n", argv[0]); exit (1); } break; case 'b': b_flag = 1; if (sscanf (optarg, "%d/%d/%d", &b_cyl, &b_head, &b_sec) != 3) { (void)fprintf (stderr, "%s: Bad argument " "to the -b flag.\n", argv[0]); exit (1); } break; default: usage(); } argc -= optind; argv += optind; if (sh_flag && (a_flag || i_flag || u_flag || f_flag || s_flag)) usage(); if (partition == -1 && s_flag) { (void) fprintf (stderr, "-s flag requires a partition selected.\n"); usage(); } if (argc > 0) disk = argv[0]; if (open_disk(a_flag || i_flag || u_flag) < 0) exit(1); if (read_s0()) init_sector0(sectors > 63 ? 63 : sectors); intuit_translated_geometry(); if (!sh_flag && !f_flag) printf("******* Working on device %s *******\n", disk); if ((i_flag || u_flag) && (!f_flag || b_flag)) get_params_to_use(); if (i_flag) init_sector0(dos_sectors > 63 ? 63 : dos_sectors); if (!sh_flag && !f_flag) printf("Warning: BIOS sector numbering starts with sector 1\n"); /* Do the update stuff! */ if (u_flag) { if (!f_flag) printf("Information from DOS bootblock is:\n"); if (partition == -1) for (part = 0; part < NDOSPART; part++) change_part(part,-1, -1, -1); else change_part(partition, csysid, cstart, csize); } else if (!i_flag) print_s0(partition); if (a_flag) change_active(partition); if (u_flag || a_flag || i_flag) { if (!f_flag) { printf("\nWe haven't changed the partition table " "yet. This is your last chance.\n"); print_s0(-1); if (yesno("Should we write new partition table?")) write_s0(); } else write_s0(); } exit(0); } void usage() { (void)fprintf(stderr, "usage: fdisk [-aiufS] [-0|-1|-2|-3] " "[device]\n"); exit(1); } void print_s0(which) int which; { int part; print_params(); if (!sh_flag) printf("Information from DOS bootblock is:\n"); if (which == -1) { for (part = 0; part < NDOSPART; part++) { if (!sh_flag) printf("%d: ", part); print_part(part); } } else print_part(which); } static struct dos_partition mtpart = { 0 }; static inline unsigned short getshort(p) void *p; { unsigned char *cp = p; return cp[0] | (cp[1] << 8); } static inline void putshort(p, l) void *p; unsigned short l; { unsigned char *cp = p; *cp++ = l; *cp++ = l >> 8; } static inline unsigned long getlong(p) void *p; { unsigned char *cp = p; return cp[0] | (cp[1] << 8) | (cp[2] << 16) | (cp[3] << 24); } static inline void putlong(p, l) void *p; unsigned long l; { unsigned char *cp = p; *cp++ = l; *cp++ = l >> 8; *cp++ = l >> 16; *cp++ = l >> 24; } void print_part(part) int part; { struct dos_partition *partp; int empty; partp = &mboot.parts[part]; empty = !memcmp(partp, &mtpart, sizeof(struct dos_partition)); if (sh_flag) { if (empty) { printf("PART%dSIZE=0\n", part); return; } printf("PART%dID=%d\n", part, partp->dp_typ); printf("PART%dSIZE=%ld\n", part, getlong(&partp->dp_size)); printf("PART%dSTART=%ld\n", part, getlong(&partp->dp_start)); printf("PART%dFLAG=0x%x\n", part, partp->dp_flag); printf("PART%dBCYL=%d\n", part, DPCYL(partp->dp_scyl, partp->dp_ssect)); printf("PART%dBHEAD=%d\n", part, partp->dp_shd); printf("PART%dBSEC=%d\n", part, DPSECT(partp->dp_ssect)); printf("PART%dECYL=%d\n", part, DPCYL(partp->dp_ecyl, partp->dp_esect)); printf("PART%dEHEAD=%d\n", part, partp->dp_ehd); printf("PART%dESEC=%d\n", part, DPSECT(partp->dp_esect)); return; } /* Not sh_flag. */ if (empty) { printf("\n"); return; } printf("sysid %d (%s)\n", partp->dp_typ, get_type(partp->dp_typ)); printf(" start %ld, size %ld (%ld MB), flag 0x%x\n", getlong(&partp->dp_start), getlong(&partp->dp_size), getlong(&partp->dp_size) * 512 / (1024 * 1024), partp->dp_flag); printf("\tbeg: cylinder %4d, head %3d, sector %2d\n", DPCYL(partp->dp_scyl, partp->dp_ssect), partp->dp_shd, DPSECT(partp->dp_ssect)); printf("\tend: cylinder %4d, head %3d, sector %2d\n", DPCYL(partp->dp_ecyl, partp->dp_esect), partp->dp_ehd, DPSECT(partp->dp_esect)); } void init_sector0(start) int start; { int i; struct dos_partition *partp; int dos_disksectors = dos_cylinders * dos_heads * dos_sectors; memcpy(mboot.bootinst, bootcode, sizeof(bootcode)); putshort(&mboot.signature, BOOT_MAGIC); for (i=0; i<3; i++) memset (&mboot.parts[i], 0, sizeof(struct dos_partition)); partp = &mboot.parts[3]; partp->dp_typ = DOSPTYP_386BSD; partp->dp_flag = ACTIVE; putlong(&partp->dp_start, start); putlong(&partp->dp_size, dos_disksectors - start); dos(getlong(&partp->dp_start), &partp->dp_scyl, &partp->dp_shd, &partp->dp_ssect); dos(getlong(&partp->dp_start) + getlong(&partp->dp_size) - 1, &partp->dp_ecyl, &partp->dp_ehd, &partp->dp_esect); printf ("DOS partition table initialized.\n"); } /* Prerequisite: the disklabel parameters and master boot record must * have been read (i.e. dos_* and mboot are meaningful). * Specification: modifies dos_cylinders, dos_heads, dos_sectors, and * dos_cylindersectors to be consistent with what the * partition table is using, if we can find a geometry * which is consistent with all partition table entries. * We may get the number of cylinders slightly wrong (in * the conservative direction). The idea is to be able * to create a NetBSD partition on a disk we don't know * the translated geometry of. * This whole routine should be replaced with a kernel interface to get * the BIOS geometry (which in turn requires modifications to the i386 * boot loader to pass in the BIOS geometry for each disk). */ void intuit_translated_geometry() { int cylinders = -1, heads = -1, sectors = -1, i, j; int c1, h1, s1, c2, h2, s2; long a1, a2; quad_t num, denom; /* Try to deduce the number of heads from two different mappings. */ for (i = 0; i < NDOSPART * 2; i++) { if (get_mapping(i, &c1, &h1, &s1, &a1) < 0) continue; for (j = 0; j < 8; j++) { if (get_mapping(j, &c2, &h2, &s2, &a2) < 0) continue; num = (quad_t)h1*(a2-s2) - (quad_t)h2*(a1-s1); denom = (quad_t)c2*(a1-s1) - (quad_t)c1*(a2-s2); if (denom != 0 && num % denom == 0) { heads = num / denom; break; } } if (heads != -1) break; } if (heads == -1) return; /* Now figure out the number of sectors from a single mapping. */ for (i = 0; i < NDOSPART * 2; i++) { if (get_mapping(i, &c1, &h1, &s1, &a1) < 0) continue; num = a1 - s1; denom = c1 * heads + h1; if (denom != 0 && num % denom == 0) { sectors = num / denom; break; } } if (sectors == -1) return; /* Estimate the number of cylinders. */ cylinders = dos_cylinders * dos_cylindersectors / heads / sectors; /* Now verify consistency with each of the partition table entries. * Be willing to shove cylinders up a little bit to make things work, * but translation mismatches are fatal. */ for (i = 0; i < NDOSPART * 2; i++) { if (get_mapping(i, &c1, &h1, &s1, &a1) < 0) continue; if (sectors * (c1 * heads + h1) + s1 != a1) return; if (c1 >= cylinders) cylinders = c1 + 1; } /* Everything checks out. Reset the geometry to use for further * calculations. */ dos_cylinders = cylinders; dos_heads = heads; dos_sectors = sectors; dos_cylindersectors = heads * sectors; } /* For the purposes of intuit_translated_geometry(), treat the partition * table as a list of eight mapping between (cylinder, head, sector) * triplets and absolute sectors. Get the relevant geometry triplet and * absolute sectors for a given entry, or return -1 if it isn't present. * Note: for simplicity, the returned sector is 0-based. */ int get_mapping(i, cylinder, head, sector, absolute) int i, *cylinder, *head, *sector; long *absolute; { struct dos_partition *part = &mboot.parts[i / 2]; if (part->dp_typ == 0) return -1; if (i % 2 == 0) { *cylinder = DPCYL(part->dp_scyl, part->dp_ssect); *head = part->dp_shd; *sector = DPSECT(part->dp_ssect) - 1; *absolute = getlong(&part->dp_start); } else { *cylinder = DPCYL(part->dp_ecyl, part->dp_esect); *head = part->dp_ehd; *sector = DPSECT(part->dp_esect) - 1; *absolute = getlong(&part->dp_start) + getlong(&part->dp_size) - 1; } return 0; } void change_part(part, csysid, cstart, csize) int part, csysid, cstart, csize; { struct dos_partition *partp; partp = &mboot.parts[part]; if (s_flag) { partp->dp_typ = csysid; putlong(&partp->dp_start, cstart); putlong(&partp->dp_size, csize); dos(getlong(&partp->dp_start), &partp->dp_scyl, &partp->dp_shd, &partp->dp_ssect); dos(getlong(&partp->dp_start) + getlong(&partp->dp_size) - 1, &partp->dp_ecyl, &partp->dp_ehd, &partp->dp_esect); if (f_flag) return; } printf("The data for partition %d is:\n", part); print_part(part); if (!u_flag || !yesno("Do you want to change it?")) return; do { { int sysid, start, size; sysid = partp->dp_typ, start = getlong(&partp->dp_start), size = getlong(&partp->dp_size); decimal("sysid", &sysid); decimal("start", &start); decimal("size", &size); partp->dp_typ = sysid; putlong(&partp->dp_start, start); putlong(&partp->dp_size, size); } if (yesno("Explicitly specify beg/end address?")) { int tsector, tcylinder, thead; tcylinder = DPCYL(partp->dp_scyl, partp->dp_ssect); thead = partp->dp_shd; tsector = DPSECT(partp->dp_ssect); decimal("beginning cylinder", &tcylinder); decimal("beginning head", &thead); decimal("beginning sector", &tsector); partp->dp_scyl = DOSCYL(tcylinder); partp->dp_shd = thead; partp->dp_ssect = DOSSECT(tsector, tcylinder); tcylinder = DPCYL(partp->dp_ecyl, partp->dp_esect); thead = partp->dp_ehd; tsector = DPSECT(partp->dp_esect); decimal("ending cylinder", &tcylinder); decimal("ending head", &thead); decimal("ending sector", &tsector); partp->dp_ecyl = DOSCYL(tcylinder); partp->dp_ehd = thead; partp->dp_esect = DOSSECT(tsector, tcylinder); } else { dos(getlong(&partp->dp_start), &partp->dp_scyl, &partp->dp_shd, &partp->dp_ssect); dos(getlong(&partp->dp_start) + getlong(&partp->dp_size) - 1, &partp->dp_ecyl, &partp->dp_ehd, &partp->dp_esect); } print_part(part); } while (!yesno("Is this entry okay?")); } void print_params() { if (sh_flag) { printf ("DLCYL=%d\nDLHEAD=%d\nDLSEC=%d\n", cylinders, heads, sectors); printf ("BCYL=%d\nBHEAD=%d\nBSEC=%d\n", dos_cylinders, dos_heads, dos_sectors); return; } /* Not sh_flag */ printf("parameters extracted from in-core disklabel are:\n"); printf("cylinders=%d heads=%d sectors/track=%d (%d sectors/cylinder)\n\n", cylinders, heads, sectors, cylindersectors); if (dos_sectors > 63 || dos_cylinders > 1023 || dos_heads > 255) printf("Figures below won't work with BIOS for partitions not in cylinder 1\n"); printf("parameters to be used for BIOS calculations are:\n"); printf("cylinders=%d heads=%d sectors/track=%d (%d sectors/cylinder)\n\n", dos_cylinders, dos_heads, dos_sectors, dos_cylindersectors); } void change_active(which) int which; { struct dos_partition *partp; int part; int active = 4; partp = &mboot.parts[0]; if (a_flag && which != -1) active = which; else { for (part = 0; part < NDOSPART; part++) if (partp[part].dp_flag & ACTIVE) active = part; } if (!f_flag) { if (yesno("Do you want to change the active partition?")) { printf ("Choosing 4 will make no partition active.\n"); do { decimal("active partition", &active); } while (!yesno("Are you happy with this choice?")); } else return; } else if (active != 4) printf ("Making partition %d active.\n", active); for (part = 0; part < NDOSPART; part++) partp[part].dp_flag &= ~ACTIVE; if (active < 4) partp[active].dp_flag |= ACTIVE; } void get_params_to_use() { if (b_flag) { dos_cylinders = b_cyl; dos_heads = b_head; dos_sectors = b_sec; dos_cylindersectors = dos_heads * dos_sectors; return; } print_params(); if (yesno("Do you want to change our idea of what BIOS thinks?")) { do { decimal("BIOS's idea of #cylinders", &dos_cylinders); decimal("BIOS's idea of #heads", &dos_heads); decimal("BIOS's idea of #sectors", &dos_sectors); dos_cylindersectors = dos_heads * dos_sectors; print_params(); } while (!yesno("Are you happy with this choice?")); } } /***********************************************\ * Change real numbers into strange dos numbers * \***********************************************/ void dos(sector, cylinderp, headp, sectorp) int sector; unsigned char *cylinderp, *headp, *sectorp; { int cylinder, head; cylinder = sector / dos_cylindersectors; sector -= cylinder * dos_cylindersectors; head = sector / dos_sectors; sector -= head * dos_sectors; *cylinderp = DOSCYL(cylinder); *headp = head; *sectorp = DOSSECT(sector + 1, cylinder); } int fd; int open_disk(u_flag) int u_flag; { static char namebuf[MAXPATHLEN + 1]; struct stat st; fd = opendisk(disk, u_flag ? O_RDWR : O_RDONLY, namebuf, sizeof(namebuf), 0); if (fd < 0) { warn("%s", namebuf); return (-1); } disk = namebuf; if (fstat(fd, &st) == -1) { close(fd); warn("%s", disk); return (-1); } if (!S_ISCHR(st.st_mode) && !S_ISREG(st.st_mode)) { close(fd); warnx("%s is not a character device or regular file", disk); return (-1); } if (get_params() == -1) { close(fd); return (-1); } return (0); } int read_disk(sector, buf) int sector; void *buf; { if (lseek(fd, (off_t)(sector * 512), 0) == -1) return (-1); return (read(fd, buf, 512)); } int write_disk(sector, buf) int sector; void *buf; { if (lseek(fd, (off_t)(sector * 512), 0) == -1) return (-1); return (write(fd, buf, 512)); } int get_params() { if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) { warn("DIOCGDINFO"); return (-1); } dos_cylinders = cylinders = disklabel.d_ncylinders; dos_heads = heads = disklabel.d_ntracks; dos_sectors = sectors = disklabel.d_nsectors; dos_cylindersectors = cylindersectors = heads * sectors; disksectors = cylinders * heads * sectors; return (0); } int read_s0() { if (read_disk(0, mboot.bootinst) == -1) { warn("can't read fdisk partition table"); return (-1); } if (getshort(&mboot.signature) != BOOT_MAGIC) { warnx("invalid fdisk partition table found"); /* So should we initialize things? */ return (-1); } return (0); } int write_s0() { int flag; /* * write enable label sector before write (if necessary), * disable after writing. * needed if the disklabel protected area also protects * sector 0. (e.g. empty disk) */ flag = 1; if (ioctl(fd, DIOCWLABEL, &flag) < 0) warn("DIOCWLABEL"); if (write_disk(0, mboot.bootinst) == -1) { warn("can't write fdisk partition table"); return -1; } flag = 0; if (ioctl(fd, DIOCWLABEL, &flag) < 0) warn("DIOCWLABEL"); return 0; } int yesno(str) char *str; { int ch, first; printf("%s [n] ", str); first = ch = getchar(); while (ch != '\n' && ch != EOF) ch = getchar(); return (first == 'y' || first == 'Y'); } void decimal(str, num) char *str; int *num; { int acc = 0; char *cp; for (;; printf("%s is not a valid decimal number.\n", lbuf)) { printf("Supply a decimal value for \"%s\" [%d] ", str, *num); fgets(lbuf, LBUF, stdin); lbuf[strlen(lbuf)-1] = '\0'; cp = lbuf; cp += strspn(cp, " \t"); if (*cp == '\0') return; if (!isdigit(*cp)) continue; acc = strtol(lbuf, &cp, 10); cp += strspn(cp, " \t"); if (*cp != '\0') continue; *num = acc; return; } } int type_match(key, item) const void *key, *item; { const int *typep = key; const struct part_type *ptr = item; if (*typep < ptr->type) return (-1); if (*typep > ptr->type) return (1); return (0); } char * get_type(type) int type; { struct part_type *ptr; ptr = bsearch(&type, part_types, sizeof(part_types) / sizeof(struct part_type), sizeof(struct part_type), type_match); if (ptr == 0) return ("unknown"); return (ptr->name); }