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795733c59e
NetBSD/sbin/fdisk/fdisk.c
dsl 795733c59e Add a large comment about disk geometries. 
Rename (with #defines) the variables use for aligning partitions to
separate them from the bios geometry.
All in advance of allowing other partition alignments (eg 2048 sectors).
2009-12-20 17:32:09 +00:00

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/* $NetBSD: fdisk.c,v 1.127 2009/12/20 17:32:09 dsl 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.
*/
/*
* 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University
* Copyright (c) 1989 Robert. V. Baron
* Created.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: fdisk.c,v 1.127 2009/12/20 17:32:09 dsl Exp $");
#endif /* not lint */
#define MBRPTYPENAMES
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <vis.h>
#if !HAVE_NBTOOL_CONFIG_H
#include <sys/disklabel.h>
#include <sys/disklabel_gpt.h>
#include <sys/bootblock.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <disktab.h>
#include <util.h>
#include <zlib.h>
#else
#include <nbinclude/sys/disklabel.h>
#include <nbinclude/sys/disklabel_gpt.h>
#include <nbinclude/sys/bootblock.h>
#include "../../include/disktab.h"
/* We enforce -F, so none of these possibly undefined items can be needed */
#define opendisk(path, fl, buf, buflen, cooked) (-1)
#ifndef DIOCGDEFLABEL
#define DIOCGDEFLABEL 0
#endif
#ifndef DIOCGDINFO
#define DIOCGDINFO 0
#endif
#ifndef DIOCWLABEL
#define DIOCWLABEL 0
#endif
#endif /* HAVE_NBTOOL_CONFIG_H */
#define DEFAULT_BOOTDIR "/usr/mdec"
#define LE_MBR_MAGIC htole16(MBR_MAGIC)
#define LE_MBR_BS_MAGIC htole16(MBR_BS_MAGIC)
#if defined(__i386__) || defined(__x86_64__)
#if !HAVE_NBTOOL_CONFIG_H
#include <machine/cpu.h>
#endif /* !HAVE_NBTOOL_CONFIG_H */
#define BOOTSEL
#endif
#ifdef BOOTSEL
#define DEFAULT_BOOTCODE "mbr"
#define DEFAULT_BOOTSELCODE "mbr_bootsel"
#define DEFAULT_BOOTEXTCODE "mbr_ext"
/* Scan values for the various keys we use, as returned by the BIOS */
#define SCAN_ENTER 0x1c
#define SCAN_F1 0x3b
#define SCAN_1 0x2
#define MAX_BIOS_DISKS 16 /* Going beyond F12 is hard though! */
/* We same the dflt 'boot partition' as a disk block, with some magic values. */
#define DEFAULT_ACTIVE (~(daddr_t)0)
#define DEFAULT_DISK(n) (DEFAULT_ACTIVE - MAX_BIOS_DISKS + (n))
#endif
#define GPT_TYPE(offs) ((offs) == GPT_HDR_BLKNO ? "primary" : "secondary")
#ifndef PRIdaddr
#define PRIdaddr PRId64
#endif
#ifndef _PATH_DEFDISK
#define _PATH_DEFDISK "/dev/rwd0d"
#endif
struct {
struct mbr_sector *ptn; /* array of pbrs */
daddr_t base; /* first sector of ext. ptn */
daddr_t limit; /* last sector of ext. ptn */
int num_ptn; /* number of contained partitions */
int ptn_id; /* entry in mbr */
int is_corrupt; /* 1 if extended chain illegal */
} ext;
#define LBUF 100
static char lbuf[LBUF];
const char *disk = _PATH_DEFDISK;
struct disklabel disklabel; /* disk parameters */
struct mbr_sector mboot;
const char *boot_dir = DEFAULT_BOOTDIR;
char *boot_path = 0; /* name of file we actually opened */
#ifdef BOOTSEL
#define OPTIONS "0123BFSafiluvs:b:c:E:r:w:t:T:"
#else
#define change_part(e, p, id, st, sz, bm) change__part(e, p, id, st, sz)
#define OPTIONS "0123FSafiluvs:b:c:E:r:w:"
#endif
/*
* Disk geometry and partition alignment.
*
* Modern disks do not have a fixed geomery and will always give a 'faked'
* geometry that matches the ATA standard - max 16 heads and 256 sec/track.
* The ATA geometry allows access to 2^28 sectors (as does LBA mode).
*
* The BIOS calls originally used an 8bit register for cylinder, head and
* sector. Later 2 bits were stolen from the sector number and added to
* cylinder number. The BIOS will translate this faked geometry either to
* the geometry reported by the disk, or do LBA reads (possibly LBA48).
* BIOS CHS reads have all sorts of limits, but 2^24 is absolute.
* For historic reasons the BIOS geometry is the called the dos geometry!
*
* If you know the disks real geometry it is usually worth aligning
* disk partitions to cylinder boundaries (certainly traditional!).
* For 'mbr' disks this has always been done with the BIOS geometry.
* The first track (typically 63 sectors) is reserved because the first
* sector is used for boot code. Similarly the data partition in an
* extended partition will start one track in. If an extended partition
* starts at the beginning of the disk you lose 2 tracks.
*
* However non-magnetic media in particular has physical sectors that are
* not the same size as those reported, so has to do read modify write
* sequences for misaligned transfers. The alignment of partitions to
* cylinder boundaries makes this happen all the time.
*
* It is thus sensible to align partitions on a sensible sector boundary.
* For instance 1MB (2048 sectors).
* Common code can do this by using a geometry with 1 head and 2048
* sectors per track.
*/
/* Disks reported geometry and overall size from device driver */
unsigned int cylinders, sectors, heads;
daddr_t disksectors;
#define cylindersectors (heads * sectors)
/* Geometry from the BIOS */
unsigned int dos_cylinders;
unsigned int dos_heads;
unsigned int dos_sectors;
daddr_t dos_disksectors;
#define dos_cylindersectors (dos_heads * dos_sectors)
#define dos_totalsectors (dos_heads * dos_sectors * dos_cylinders)
#define DOSSECT(s,c) (((s) & 0x3f) | (((c) >> 2) & 0xc0))
#define DOSCYL(c) ((c) & 0xff)
#define SEC_IN_1M (1024 * 1024 / 512)
#define SEC_TO_MB(sec) ((unsigned int)(((sec) + SEC_IN_1M / 2) / SEC_IN_1M))
#define SEC_TO_CYL(sec) (((sec) + dos_cylindersectors/2) / dos_cylindersectors)
#define MAXCYL 1024 /* Usual limit is 1023 */
#define MAXHEAD 256 /* Usual limit is 255 */
#define MAXSECTOR 63
int partition = -1;
/* Alignment of partition, and offset if first sector unusable */
#define ptn_alignment dos_cylindersectors
#define ptn_offset dos_sectors
int fd = -1, wfd = -1, *rfd = &fd;
char *disk_file = NULL;
char *disk_type = NULL;
int a_flag; /* set active partition */
int i_flag; /* init bootcode */
int u_flag; /* update partition data */
int v_flag; /* more verbose */
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_flag; /* Edit/install bootselect code */
int E_flag; /* extended partition number */
int b_cyl, b_head, b_sec; /* b_flag values. */
#if !HAVE_NBTOOL_CONFIG_H
int F_flag = 0;
#else
/* Tool - force 'file' mode to avoid unsupported functions and ioctls */
int F_flag = 1;
#endif
struct gpt_hdr gpt1, gpt2; /* GUID partition tables */
struct mbr_sector bootcode[8192 / sizeof (struct mbr_sector)];
int bootsize; /* actual size of bootcode */
int boot_installed; /* 1 if we've copied code into the mbr */
#if (defined(__i386__) || defined(__x86_64__)) && !HAVE_NBTOOL_CONFIG_H
struct disklist *dl;
#endif
#define KNOWN_SYSIDS (sizeof(mbr_ptypes)/sizeof(mbr_ptypes[0]))
void usage(void);
void print_s0(int);
void print_part(struct mbr_sector *, int, daddr_t);
void print_mbr_partition(struct mbr_sector *, int, daddr_t, daddr_t, int);
void print_pbr(daddr_t, int, uint8_t);
int is_all_zero(const unsigned char *, size_t);
void printvis(int, const char *, const char *, size_t);
int read_boot(const char *, void *, size_t, int);
void init_sector0(int);
void intuit_translated_geometry(void);
void get_geometry(void);
void get_extended_ptn(void);
#if (defined(__i386__) || defined(__x86_64__)) && !HAVE_NBTOOL_CONFIG_H
void get_diskname(const char *, char *, size_t);
#endif /* (defined(__i386__) || defined(__x86_64__)) && !HAVE_NBTOOL_CONFIG_H */
int change_part(int, int, int, daddr_t, daddr_t, char *);
void print_params(void);
int first_active(void);
void change_active(int);
void get_params_to_use(void);
void dos(int, unsigned char *, unsigned char *, unsigned char *);
int open_disk(int);
int read_disk(daddr_t, void *);
int write_disk(daddr_t, void *);
int get_params(void);
int read_s0(daddr_t, struct mbr_sector *);
int write_mbr(void);
int read_gpt(daddr_t, struct gpt_hdr *);
int delete_gpt(struct gpt_hdr *);
int yesno(const char *, ...);
int decimal(const char *, int64_t, int, int64_t, int64_t);
#define DEC_SEC 1 /* asking for a sector number */
#define DEC_RND 2 /* round to end of first track */
#define DEC_RND_0 4 /* round 0 to size of a track */
#define DEC_RND_DOWN 8 /* subtract 1 track */
#define DEC_RND_DOWN_2 16 /* subtract 2 tracks */
void string(const char *, int, char *);
int ptn_id(const char *, int *);
int type_match(const void *, const void *);
const char *get_type(int);
int get_mapping(int, unsigned int *, unsigned int *, unsigned int *, unsigned long *);
#ifdef BOOTSEL
daddr_t configure_bootsel(daddr_t);
void install_bootsel(int);
daddr_t get_default_boot(void);
void set_default_boot(daddr_t);
#endif
static void
initvar_disk(const char **diskp)
{
#if !HAVE_NBTOOL_CONFIG_H
int mib[2];
size_t len;
char *root_device;
mib[0] = CTL_KERN;
mib[1] = KERN_ROOT_DEVICE;
if (sysctl(mib, 2, NULL, &len, NULL, 0) == -1 ||
(root_device = malloc(len)) == NULL ||
sysctl(mib, 2, root_device, &len, NULL, 0) == -1)
return;
*diskp = root_device;
#endif /* HAVE_NBTOOL_CONFIG_H */
}
int
main(int argc, char *argv[])
{
struct stat sb;
int ch;
size_t len;
char *cp;
int n;
#ifdef BOOTSEL
daddr_t default_ptn; /* start sector of default ptn */
char *cbootmenu = 0;
#endif
int csysid; /* For the s_flag. */
unsigned int cstart, csize;
a_flag = u_flag = sh_flag = f_flag = s_flag = b_flag = 0;
i_flag = B_flag = 0;
v_flag = 0;
E_flag = 0;
csysid = cstart = csize = 0;
while ((ch = getopt(argc, argv, OPTIONS)) != -1)
switch (ch) {
case '0':
partition = 0;
break;
case '1':
partition = 1;
break;
case '2':
partition = 2;
break;
case '3':
partition = 3;
break;
case 'E': /* Extended partition number */
E_flag = 1;
partition = strtoul(optarg, &cp, 0);
if (*cp || partition < 0)
errx(1, "Bad partition number -E %s.", optarg);
break;
#ifdef BOOTSEL
case 'B': /* Bootselect parameters */
B_flag = 1;
break;
#endif
case 'F': /* device argument is really a file */
F_flag = 1;
break;
case 'S': /* Output as shell variables */
sh_flag = 1;
break;
case 'a': /* Set active partition */
a_flag = 1;
break;
case 'f': /* Non interactive */
f_flag = 1;
break;
case 'i': /* Always update bootcode */
i_flag = 1;
break;
case 'l': /* List known partition types */
for (len = 0; len < KNOWN_SYSIDS; len++)
printf("%03d %s\n", mbr_ptypes[len].id,
mbr_ptypes[len].name);
return 0;
case 'u': /* Update partition details */
u_flag = 1;
break;
case 'v': /* Be verbose */
v_flag++;
break;
case 's': /* Partition details */
s_flag = 1;
if (sscanf(optarg, "%d/%u/%u%n", &csysid, &cstart,
&csize, &n) == 3) {
if (optarg[n] == 0)
break;
#ifdef BOOTSEL
if (optarg[n] == '/') {
cbootmenu = optarg + n + 1;
break;
}
#endif
}
errx(1, "Bad argument to the -s flag.");
break;
case 'b': /* BIOS geometry */
b_flag = 1;
if (sscanf(optarg, "%d/%d/%d%n", &b_cyl, &b_head,
&b_sec, &n) != 3 || optarg[n] != 0)
errx(1, "Bad argument to the -b flag.");
if (b_cyl > MAXCYL)
b_cyl = MAXCYL;
break;
case 'c': /* file/directory containing boot code */
if (strchr(optarg, '/') != NULL &&
stat(optarg, &sb) == 0 &&
(sb.st_mode & S_IFMT) == S_IFDIR) {
boot_dir = optarg;
break;
}
bootsize = read_boot(optarg, bootcode,
sizeof bootcode, 1);
i_flag = 1;
break;
case 'r': /* read data from disk_file (not raw disk) */
rfd = &wfd;
/* FALLTHROUGH */
case 'w': /* write data to disk_file */
disk_file = optarg;
break;
case 't':
if (setdisktab(optarg) == -1)
errx(EXIT_FAILURE, "bad disktab");
break;
case 'T':
disk_type = optarg;
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (disk_type != NULL && getdiskbyname(disk_type) == NULL)
errx(EXIT_FAILURE, "bad disktype");
if (sh_flag && (a_flag || i_flag || u_flag || f_flag || s_flag))
usage();
if (B_flag && f_flag) {
warnx("Bootselector may only be configured interactively");
usage();
}
if (f_flag && u_flag && !s_flag) {
warnx("Partition data not specified");
usage();
}
if (s_flag && partition == -1) {
warnx("-s flag requires a partition selected.");
usage();
}
if (argc > 1)
usage();
if (argc > 0)
disk = argv[0];
else if (!F_flag) {
/* Default to boot device */
initvar_disk(&disk);
}
if (!F_flag && stat(disk, &sb) == 0 && S_ISREG(sb.st_mode))
F_flag = 1;
if (open_disk(B_flag || a_flag || i_flag || u_flag) < 0)
exit(1);
if (read_s0(0, &mboot))
/* must have been a blank disk */
init_sector0(1);
read_gpt(GPT_HDR_BLKNO, &gpt1);
read_gpt(disksectors - 1, &gpt2);
#if (defined(__i386__) || defined(__x86_64__)) && !HAVE_NBTOOL_CONFIG_H
get_geometry();
#else
intuit_translated_geometry();
#endif
get_extended_ptn();
#ifdef BOOTSEL
default_ptn = get_default_boot();
#endif
if (E_flag && !u_flag && partition >= ext.num_ptn)
errx(1, "Extended partition %d is not defined.", partition);
if (u_flag && (!f_flag || b_flag))
get_params_to_use();
/* Do the update stuff! */
if (u_flag) {
if (s_flag)
change_part(E_flag, partition, csysid, cstart, csize,
cbootmenu);
else {
int part = partition, chg_ext = E_flag, prompt = 1;
do {
if (prompt) {
printf("\n");
print_s0(partition);
}
if (partition == -1)
part = ptn_id(
"Which partition do you want to change?",
&chg_ext);
if (part < 0)
break;
prompt = change_part(chg_ext, part, 0, 0, 0, 0);
} while (partition == -1);
}
} else
if (!i_flag && !B_flag) {
print_params();
print_s0(partition);
}
if (a_flag && !E_flag)
change_active(partition);
#ifdef BOOTSEL
if (B_flag || u_flag || i_flag)
/* Ensure the mbr code supports this configuration */
install_bootsel(0);
if (B_flag)
default_ptn = configure_bootsel(default_ptn);
set_default_boot(default_ptn);
#else
if (i_flag)
init_sector0(0);
#endif
if (u_flag || a_flag || i_flag || B_flag) {
if (!f_flag) {
printf("\nWe haven't written the MBR back to disk "
"yet. This is your last chance.\n");
if (u_flag)
print_s0(-1);
if (gpt1.hdr_size != 0 || gpt2.hdr_size != 0)
printf("\nWARNING: The disk is carrying "
"GUID Partition Tables.\n"
" If you continue, "
"GPT headers will be deleted.\n\n");
if (yesno("Should we write new partition table?")) {
delete_gpt(&gpt1);
delete_gpt(&gpt2);
write_mbr();
}
} else {
if (delete_gpt(&gpt1) > 0)
warnx("Primary GPT header was deleted");
if (delete_gpt(&gpt2) > 0)
warnx("Secondary GPT header was deleted");
write_mbr();
}
}
exit(0);
}
void
usage(void)
{
int indent = 7 + (int)strlen(getprogname()) + 1;
(void)fprintf(stderr, "usage: %s [-afiluvBS] "
"[-b cylinders/heads/sectors] \\\n"
"%*s[-0123 | -E num "
"[-s id/start/size[/bootmenu]]] \\\n"
"%*s[-t disktab] [-T disktype] \\\n"
"%*s[-c bootcode] "
"[-r|-w file] [device]\n"
"\t-a change active partition\n"
"\t-f force - not interactive\n"
"\t-i initialise MBR code\n"
"\t-l list partition types\n"
"\t-u update partition data\n"
"\t-v verbose output, -v -v more verbose still\n"
"\t-B update bootselect options\n"
"\t-F treat device as a regular file\n"
"\t-S output as shell defines\n"
"\t-r and -w access 'file' for non-destructive testing\n",
getprogname(), indent, "", indent, "", indent, "");
exit(1);
}
static daddr_t
ext_offset(int part)
{
daddr_t offset = ext.base;
if (part != 0)
offset += le32toh(ext.ptn[part - 1].mbr_parts[1].mbrp_start);
return offset;
}
void
print_s0(int which)
{
int part;
if (which == -1) {
if (!sh_flag)
printf("Partition table:\n");
for (part = 0; part < MBR_PART_COUNT; part++) {
if (!sh_flag)
printf("%d: ", part);
print_part(&mboot, part, 0);
}
if (!sh_flag) {
if (ext.is_corrupt)
printf("Extended partition table is corrupt\n");
else
if (ext.num_ptn != 0)
printf("Extended partition table:\n");
}
for (part = 0; part < ext.num_ptn; part++) {
if (!sh_flag)
printf("E%d: ", part);
print_part(&ext.ptn[part], 0, ext_offset(part));
if (!sh_flag && v_flag >= 2) {
printf("link: ");
print_mbr_partition(&ext.ptn[part], 1,
ext_offset(part), ext.base, 0);
}
}
#ifdef BOOTSEL
if (!sh_flag && mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC) {
int tmo;
printf("Bootselector ");
if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_ACTIVE) {
printf("enabled");
tmo = le16toh(mboot.mbr_bootsel.mbrbs_timeo);
if (tmo == 0xffff)
printf(", infinite timeout");
else
printf(", timeout %d seconds",
(10 * tmo + 9) / 182);
} else
printf("disabled");
printf(".\n");
}
#endif
if (!sh_flag) {
int active = first_active();
if (active == MBR_PART_COUNT)
printf("No active partition.\n");
else
printf("First active partition: %d\n", active);
}
if (!sh_flag && mboot.mbr_dsn != 0)
printf("Drive serial number: %"PRIu32" (0x%08x)\n",
le32toh(mboot.mbr_dsn),
le32toh(mboot.mbr_dsn));
return;
}
if (E_flag) {
if (!sh_flag)
printf("Extended partition E%d:\n", which);
if (which > ext.num_ptn)
printf("Undefined\n");
else
print_part(&ext.ptn[which], 0, ext_offset(which));
} else {
if (!sh_flag)
printf("Partition %d:\n", which);
print_part(&mboot, which, 0);
}
}
void
print_part(struct mbr_sector *boot, int part, daddr_t offset)
{
struct mbr_partition *partp;
const char *e;
if (!sh_flag) {
print_mbr_partition(boot, part, offset, 0, 0);
return;
}
partp = &boot->mbr_parts[part];
if (boot != &mboot) {
part = boot - ext.ptn;
e = "E";
} else
e = "";
if (partp->mbrp_type == 0) {
printf("PART%s%dSIZE=0\n", e, part);
return;
}
printf("PART%s%dID=%d\n", e, part, partp->mbrp_type);
printf("PART%s%dSIZE=%u\n", e, part, le32toh(partp->mbrp_size));
printf("PART%s%dSTART=%"PRIdaddr"\n", e, part,
offset + le32toh(partp->mbrp_start));
printf("PART%s%dFLAG=0x%x\n", e, part, partp->mbrp_flag);
printf("PART%s%dBCYL=%d\n", e, part,
MBR_PCYL(partp->mbrp_scyl, partp->mbrp_ssect));
printf("PART%s%dBHEAD=%d\n", e, part, partp->mbrp_shd);
printf("PART%s%dBSEC=%d\n", e, part, MBR_PSECT(partp->mbrp_ssect));
printf("PART%s%dECYL=%d\n", e, part,
MBR_PCYL(partp->mbrp_ecyl, partp->mbrp_esect));
printf("PART%s%dEHEAD=%d\n", e, part, partp->mbrp_ehd);
printf("PART%s%dESEC=%d\n", e, part, MBR_PSECT(partp->mbrp_esect));
}
static void
pr_cyls(daddr_t sector, int is_end)
{
unsigned long cyl, head, sect;
cyl = sector / dos_cylindersectors;
sect = sector - cyl * dos_cylindersectors;
head = sect / dos_sectors;
sect -= head * dos_sectors;
printf("%lu", cyl);
if (is_end) {
if (head == dos_heads - 1 && sect == dos_sectors - 1)
return;
} else {
if (head == 0 && sect == 0)
return;
}
printf("/%lu/%lu", head, sect + 1);
}
void
print_mbr_partition(struct mbr_sector *boot, int part,
daddr_t offset, daddr_t exoffset, int indent)
{
daddr_t start;
daddr_t size;
struct mbr_partition *partp = &boot->mbr_parts[part];
struct mbr_sector eboot;
int p;
static int dumped = 0;
if (partp->mbrp_type == 0 && v_flag < 2) {
printf("<UNUSED>\n");
return;
}
start = le32toh(partp->mbrp_start);
size = le32toh(partp->mbrp_size);
if (MBR_IS_EXTENDED(partp->mbrp_type))
start += exoffset;
else
start += offset;
printf("%s (sysid %d)\n", get_type(partp->mbrp_type), partp->mbrp_type);
#ifdef BOOTSEL
if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC &&
boot->mbr_bootsel.mbrbs_nametab[part][0])
printf("%*s bootmenu: %s\n", indent, "",
boot->mbr_bootsel.mbrbs_nametab[part]);
#endif
printf("%*s start %"PRIdaddr", size %"PRIdaddr,
indent, "", start, size);
if (size != 0) {
printf(" (%u MB, Cyls ", SEC_TO_MB(size));
if (v_flag == 0 && le32toh(partp->mbrp_start) == ptn_offset)
pr_cyls(start - ptn_offset, 0);
else
pr_cyls(start, 0);
printf("-");
pr_cyls(start + size - 1, 1);
printf(")");
}
switch (partp->mbrp_flag) {
case 0:
break;
case MBR_PFLAG_ACTIVE:
printf(", Active");
break;
default:
printf(", flag 0x%x", partp->mbrp_flag);
break;
}
printf("\n");
if (v_flag) {
printf("%*s beg: cylinder %4d, head %3d, sector %2d\n",
indent, "",
MBR_PCYL(partp->mbrp_scyl, partp->mbrp_ssect),
partp->mbrp_shd, MBR_PSECT(partp->mbrp_ssect));
printf("%*s end: cylinder %4d, head %3d, sector %2d\n",
indent, "",
MBR_PCYL(partp->mbrp_ecyl, partp->mbrp_esect),
partp->mbrp_ehd, MBR_PSECT(partp->mbrp_esect));
}
if (partp->mbrp_type == 0 && start == 0 && v_flag < 3)
return;
if (! MBR_IS_EXTENDED(partp->mbrp_type))
print_pbr(start, indent + 8, partp->mbrp_type);
if (!MBR_IS_EXTENDED(partp->mbrp_type) ||
(v_flag <= 2 && !ext.is_corrupt))
return;
/*
* Recursive dump extended table,
* This is read from the disk - so is wrong during editing.
* Just ensure we only show it once.
*/
if (dumped)
return;
printf("%*s Extended partition table:\n", indent, "");
indent += 4;
if (read_s0(start, &eboot) == -1)
return;
for (p = 0; p < MBR_PART_COUNT; p++) {
printf("%*s%d: ", indent, "", p);
print_mbr_partition(&eboot, p, start,
exoffset ? exoffset : start, indent);
}
if (exoffset == 0)
dumped = 1;
}
/* Print a line with a label and a vis-encoded string */
void
printvis(int indent, const char *label, const char *buf, size_t size)
{
char *visbuf;
if ((visbuf = malloc(size * 4 + 1)) == NULL)
err(1, "Malloc failed");
strsvisx(visbuf, buf, size, VIS_TAB|VIS_NL|VIS_OCTAL, "\"");
printf("%*s%s: \"%s\"\n",
indent, "",
label, visbuf);
free(visbuf);
}
/* Check whether a buffer contains all bytes zero */
int
is_all_zero(const unsigned char *p, size_t size)
{
while (size-- > 0) {
if (*p++ != 0)
return 0;
}
return 1;
}
/*
* Report on the contents of a PBR sector.
*
* We first perform several sanity checks. If vflag >= 2, we report all
* failing tests, but for smaller values of v_flag we stop after the
* first failing test. Tests are ordered in an attempt to get the most
* useful error message from the first failing test.
*
* If v_flag >= 2, we also report some decoded values from the PBR.
* These results may be meaningless, if the PBR doesn't follow common
* conventions.
*
* Trying to decode anything more than the magic number in the last
* two bytes is a layering violation, but it can be very useful in
* diagnosing boot failures.
*/
void
print_pbr(daddr_t sector, int indent, uint8_t part_type)
{
struct mbr_sector pboot;
unsigned char *p, *endp;
unsigned char val;
int ok;
int errcount = 0;
#define PBR_ERROR(...) \
do { \
++errcount; \
printf("%*s%s: ", indent, "", \
(v_flag < 2 ? "PBR is not bootable" : "Not bootable")); \
printf(__VA_ARGS__); \
if (v_flag < 2) \
return; \
} while (/*CONSTCOND*/ 0)
if (v_flag >= 2) {
printf("%*sInformation from PBR:\n",
indent, "");
indent += 4;
}
if (read_disk(sector, &pboot) == -1) {
PBR_ERROR("Sector %"PRIdaddr" is unreadable (%s)\n",
sector, strerror(errno));
return;
}
/* all bytes identical? */
p = (unsigned char *)&pboot;
endp = p + sizeof(pboot);
val = *p;
ok = 0;
for (; p < endp; p++) {
if (*p != val) {
ok = 1;
break;
}
}
if (! ok)
PBR_ERROR("All bytes are identical (0x%02x)\n", val);
if (pboot.mbr_magic != LE_MBR_MAGIC)
PBR_ERROR("Bad magic number (0x%04x)\n",
le16toh(pboot.mbr_magic));
#if 0
/* Some i386 OS might fail this test. All non-i386 will fail. */
if (pboot.mbr_jmpboot[0] != 0xE9
&& pboot.mbr_jmpboot[0] != 0xEB) {
PBR_ERROR("Does not begin with i386 JMP instruction"
" (0x%02x 0x%02x0 0x%02x)\n",
pboot.mbr_jmpboot[0], pboot.mbr_jmpboot[1],
pboot.mbr_jmpboot[2]);
}
#endif
if (v_flag > 0 && errcount == 0)
printf("%*sPBR appears to be bootable\n",
indent, "");
if (v_flag < 2)
return;
if (! is_all_zero(pboot.mbr_oemname, sizeof(pboot.mbr_oemname))) {
printvis(indent, "OEM name", (char *)pboot.mbr_oemname,
sizeof(pboot.mbr_oemname));
}
if (pboot.mbr_bpb.bpb16.bsBootSig == 0x29)
printf("%*sBPB FAT16 boot signature found\n",
indent, "");
if (pboot.mbr_bpb.bpb32.bsBootSig == 0x29)
printf("%*sBPB FAT32 boot signature found\n",
indent, "");
#undef PBR_ERROR
}
int
read_boot(const char *name, void *buf, size_t len, int err_exit)
{
int bfd, ret;
struct stat st;
if (boot_path != NULL)
free(boot_path);
if (strchr(name, '/') == 0)
asprintf(&boot_path, "%s/%s", boot_dir, name);
else
boot_path = strdup(name);
if (boot_path == NULL)
err(1, "Malloc failed");
if ((bfd = open(boot_path, O_RDONLY)) < 0 || fstat(bfd, &st) == -1) {
warn("%s", boot_path);
goto fail;
}
if (st.st_size > (off_t)len) {
warnx("%s: bootcode too large", boot_path);
goto fail;
}
ret = st.st_size;
if (ret < 0x200) {
warnx("%s: bootcode too small", boot_path);
goto fail;
}
if (read(bfd, buf, len) != ret) {
warn("%s", boot_path);
goto fail;
}
/*
* Do some sanity checking here
*/
if (((struct mbr_sector *)buf)->mbr_magic != LE_MBR_MAGIC) {
warnx("%s: invalid magic", boot_path);
goto fail;
}
close(bfd);
ret = (ret + 0x1ff) & ~0x1ff;
return ret;
fail:
if (bfd >= 0)
close(bfd);
if (err_exit)
exit(1);
return 0;
}
void
init_sector0(int zappart)
{
int i;
int copy_size = offsetof(struct mbr_sector, mbr_dsn);
#ifdef DEFAULT_BOOTCODE
if (bootsize == 0)
bootsize = read_boot(DEFAULT_BOOTCODE, bootcode,
sizeof bootcode, 0);
#endif
#ifdef BOOTSEL
if (mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC
&& bootcode[0].mbr_bootsel_magic == LE_MBR_BS_MAGIC)
copy_size = MBR_BS_OFFSET;
#endif
if (bootsize != 0) {
boot_installed = 1;
memcpy(&mboot, bootcode, copy_size);
mboot.mbr_bootsel_magic = bootcode[0].mbr_bootsel_magic;
}
mboot.mbr_magic = LE_MBR_MAGIC;
if (!zappart)
return;
for (i = 0; i < MBR_PART_COUNT; i++)
memset(&mboot.mbr_parts[i], 0, sizeof(mboot.mbr_parts[i]));
}
void
get_extended_ptn(void)
{
struct mbr_partition *mp;
struct mbr_sector *boot;
daddr_t offset;
struct mbr_sector *nptn;
/* find first (there should only be one) extended partition */
for (mp = mboot.mbr_parts; !MBR_IS_EXTENDED(mp->mbrp_type); mp++)
if (mp >= &mboot.mbr_parts[MBR_PART_COUNT])
return;
/*
* The extended partition should be structured as a linked list
* (even though it appears, at first glance, to be a tree).
*/
ext.base = le32toh(mp->mbrp_start);
ext.limit = ext.base + le32toh(mp->mbrp_size);
ext.ptn_id = mp - mboot.mbr_parts;
for (offset = 0;; offset = le32toh(boot->mbr_parts[1].mbrp_start)) {
nptn = realloc(ext.ptn, (ext.num_ptn + 1) * sizeof *ext.ptn);
if (nptn == NULL)
err(1, "Malloc failed");
ext.ptn = nptn;
boot = ext.ptn + ext.num_ptn;
if (read_s0(offset + ext.base, boot) == -1)
break;
/* expect p0 to be valid and p1 to be another extended ptn */
if (MBR_IS_EXTENDED(boot->mbr_parts[0].mbrp_type))
break;
if (boot->mbr_parts[1].mbrp_type != 0 &&
!MBR_IS_EXTENDED(boot->mbr_parts[1].mbrp_type))
break;
/* p2 and p3 should be unallocated */
if (boot->mbr_parts[2].mbrp_type != 0 ||
boot->mbr_parts[3].mbrp_type != 0)
break;
/* data ptn inside extended one */
if (boot->mbr_parts[0].mbrp_type != 0 &&
offset + le32toh(boot->mbr_parts[0].mbrp_start)
+ le32toh(boot->mbr_parts[0].mbrp_size) > ext.limit)
break;
ext.num_ptn++;
if (boot->mbr_parts[1].mbrp_type == 0)
/* end of extended partition chain */
return;
/* must be in sector order */
if (offset >= le32toh(boot->mbr_parts[1].mbrp_start))
break;
}
warnx("Extended partition table is corrupt\n");
ext.is_corrupt = 1;
ext.num_ptn = 0;
}
#if (defined(__i386__) || defined(__x86_64__)) && !HAVE_NBTOOL_CONFIG_H
void
get_diskname(const char *fullname, char *diskname, size_t size)
{
const char *p, *p2;
size_t len;
p = strrchr(fullname, '/');
if (p == NULL)
p = fullname;
else
p++;
if (*p == 0) {
strlcpy(diskname, fullname, size);
return;
}
if (*p == 'r')
p++;
for (p2 = p; *p2 != 0; p2++)
if (isdigit((unsigned char)*p2))
break;
if (*p2 == 0) {
/* XXX invalid diskname? */
strlcpy(diskname, fullname, size);
return;
}
while (isdigit((unsigned char)*p2))
p2++;
len = p2 - p;
if (len > size) {
/* XXX */
strlcpy(diskname, fullname, size);
return;
}
memcpy(diskname, p, len);
diskname[len] = 0;
}
void
get_geometry(void)
{
int mib[2], i;
size_t len;
struct biosdisk_info *bip;
struct nativedisk_info *nip;
char diskname[8];
mib[0] = CTL_MACHDEP;
mib[1] = CPU_DISKINFO;
if (sysctl(mib, 2, NULL, &len, NULL, 0) < 0) {
goto out;
}
dl = (struct disklist *) malloc(len);
if (dl == NULL)
err(1, "Malloc failed");
if (sysctl(mib, 2, dl, &len, NULL, 0) < 0) {
free(dl);
dl = 0;
goto out;
}
get_diskname(disk, diskname, sizeof diskname);
for (i = 0; i < dl->dl_nnativedisks; i++) {
nip = &dl->dl_nativedisks[i];
if (strcmp(diskname, nip->ni_devname))
continue;
/*
* XXX listing possible matches is better. This is ok for
* now because the user has a chance to change it later.
* Also, if all the disks have the same parameters then we can
* just use them, we don't need to know which disk is which.
*/
if (nip->ni_nmatches != 0) {
bip = &dl->dl_biosdisks[nip->ni_biosmatches[0]];
dos_cylinders = bip->bi_cyl;
dos_heads = bip->bi_head;
dos_sectors = bip->bi_sec;
if (bip->bi_lbasecs)
dos_disksectors = bip->bi_lbasecs;
return;
}
}
out:
/* Allright, allright, make a stupid guess.. */
intuit_translated_geometry();
}
#endif /* (defined(__i386__) || defined(__x86_64__)) && !HAVE_NBTOOL_CONFIG_H */
#ifdef BOOTSEL
daddr_t
get_default_boot(void)
{
unsigned int id;
int p;
if (mboot.mbr_bootsel_magic != LE_MBR_BS_MAGIC)
/* default to first active partition */
return DEFAULT_ACTIVE;
id = mboot.mbr_bootsel.mbrbs_defkey;
if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_ASCII) {
/* Keycode is ascii */
if (id == '\r')
return DEFAULT_ACTIVE;
/* '1'+ => allocated partition id, 'a'+ => disk 0+ */
if (id >= 'a' && id < 'a' + MAX_BIOS_DISKS)
return DEFAULT_DISK(id - 'a');
id -= '1';
} else {
/* keycode is PS/2 keycode */
if (id == SCAN_ENTER)
return DEFAULT_ACTIVE;
/* 1+ => allocated partition id, F1+ => disk 0+ */
if (id >= SCAN_F1 && id < SCAN_F1 + MAX_BIOS_DISKS)
return DEFAULT_DISK(id - SCAN_F1);
id -= SCAN_1;
}
/* Convert partition index to the invariant start sector number */
for (p = 0; p < MBR_PART_COUNT; p++) {
if (mboot.mbr_parts[p].mbrp_type == 0)
continue;
if (mboot.mbr_bootsel.mbrbs_nametab[p][0] == 0)
continue;
if (id-- == 0)
return le32toh(mboot.mbr_parts[p].mbrp_start);
}
for (p = 0; p < ext.num_ptn; p++) {
if (ext.ptn[p].mbr_parts[0].mbrp_type == 0)
continue;
if (ext.ptn[p].mbr_bootsel.mbrbs_nametab[0][0] == 0)
continue;
if (id-- == 0)
return ext_offset(p)
+ le32toh(ext.ptn[p].mbr_parts[0].mbrp_start);
}
return DEFAULT_ACTIVE;
}
void
set_default_boot(daddr_t default_ptn)
{
int p;
static const unsigned char key_list[] = { SCAN_ENTER, SCAN_F1, SCAN_1,
'\r', 'a', '1' };
const unsigned char *key = key_list;
if (mboot.mbr_bootsel_magic != LE_MBR_BS_MAGIC)
/* sanity */
return;
if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_ASCII)
/* Use ascii values */
key += 3;
if (default_ptn == DEFAULT_ACTIVE) {
mboot.mbr_bootsel.mbrbs_defkey = key[0];
return;
}
if (default_ptn >= DEFAULT_DISK(0)
&& default_ptn < DEFAULT_DISK(MAX_BIOS_DISKS)) {
mboot.mbr_bootsel.mbrbs_defkey = key[1]
+ default_ptn - DEFAULT_DISK(0);
return;
}
mboot.mbr_bootsel.mbrbs_defkey = key[2];
for (p = 0; p < MBR_PART_COUNT; p++) {
if (mboot.mbr_parts[p].mbrp_type == 0)
continue;
if (mboot.mbr_bootsel.mbrbs_nametab[p][0] == 0)
continue;
if (le32toh(mboot.mbr_parts[p].mbrp_start) == default_ptn)
return;
mboot.mbr_bootsel.mbrbs_defkey++;
}
if (mboot.mbr_bootsel.mbrbs_flags & MBR_BS_EXTLBA) {
for (p = 0; p < ext.num_ptn; p++) {
if (ext.ptn[p].mbr_parts[0].mbrp_type == 0)
continue;
if (ext.ptn[p].mbr_bootsel.mbrbs_nametab[0][0] == 0)
continue;
if (le32toh(ext.ptn[p].mbr_parts[0].mbrp_start) +
ext_offset(p) == default_ptn)
return;
mboot.mbr_bootsel.mbrbs_defkey++;
}
}
/* Default to first active partition */
mboot.mbr_bootsel.mbrbs_defkey = key[0];
}
void
install_bootsel(int needed)
{
struct mbr_bootsel *mbs = &mboot.mbr_bootsel;
int p;
int ext13 = 0;
const char *code;
needed |= MBR_BS_NEWMBR; /* need new bootsel code */
/* Work out which boot code we need for this configuration */
for (p = 0; p < MBR_PART_COUNT; p++) {
if (mboot.mbr_parts[p].mbrp_type == 0)
continue;
if (mboot.mbr_bootsel_magic != LE_MBR_BS_MAGIC)
break;
if (mbs->mbrbs_nametab[p][0] == 0)
continue;
needed |= MBR_BS_ACTIVE;
if (le32toh(mboot.mbr_parts[p].mbrp_start) >= dos_totalsectors)
ext13 = MBR_BS_EXTINT13;
}
for (p = 0; p < ext.num_ptn; p++) {
if (ext.ptn[p].mbr_bootsel_magic != LE_MBR_BS_MAGIC)
continue;
if (ext.ptn[p].mbr_parts[0].mbrp_type == 0)
continue;
if (ext.ptn[p].mbr_bootsel.mbrbs_nametab[p][0] == 0)
continue;
needed |= MBR_BS_EXTLBA | MBR_BS_ACTIVE;
}
if (B_flag)
needed |= MBR_BS_ACTIVE;
/* Is the installed code good enough ? */
if (!i_flag && (needed == 0 ||
(mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC
&& (mbs->mbrbs_flags & needed) == needed))) {
/* yes - just set flags */
mbs->mbrbs_flags |= ext13;
return;
}
/* ok - we need to replace the bootcode */
if (f_flag && !(i_flag || B_flag)) {
warnx("Installed bootfile doesn't support required options.");
return;
}
if (!f_flag && bootsize == 0 && !i_flag)
/* Output an explanation for the 'update bootcode' prompt. */
printf("\n%s\n",
"Installed bootfile doesn't support required options.");
/* Were we told a specific file ? (which we have already read) */
/* If so check that it supports what we need. */
if (bootsize != 0 && needed != 0
&& (bootcode[0].mbr_bootsel_magic != LE_MBR_BS_MAGIC
|| ((bootcode[0].mbr_bootsel.mbrbs_flags & needed) != needed))) {
/* No it doesn't... */
if (f_flag)
warnx("Bootfile %s doesn't support "
"required bootsel options", boot_path );
/* But install it anyway */
else
if (yesno("Bootfile %s doesn't support the required "
"options,\ninstall default bootfile instead?",
boot_path))
bootsize = 0;
}
if (bootsize == 0) {
/* Get name of bootfile that supports the required facilities */
code = DEFAULT_BOOTCODE;
if (needed & MBR_BS_ACTIVE)
code = DEFAULT_BOOTSELCODE;
#ifdef DEFAULT_BOOTEXTCODE
if (needed & MBR_BS_EXTLBA)
code = DEFAULT_BOOTEXTCODE;
#endif
bootsize = read_boot(code, bootcode, sizeof bootcode, 0);
if (bootsize == 0)
/* The old bootcode is better than no bootcode at all */
return;
if ((bootcode[0].mbr_bootsel.mbrbs_flags & needed) != needed)
warnx("Default bootfile %s doesn't support required "
"options. Got flags 0x%x, wanted 0x%x\n",
boot_path, bootcode[0].mbr_bootsel.mbrbs_flags,
needed);
}
if (!f_flag && !yesno("Update the bootcode from %s?", boot_path))
return;
init_sector0(0);
if (mboot.mbr_bootsel_magic == LE_MBR_BS_MAGIC)
mbs->mbrbs_flags = bootcode[0].mbr_bootsel.mbrbs_flags | ext13;
}
daddr_t
configure_bootsel(daddr_t default_ptn)
{
struct mbr_bootsel *mbs = &mboot.mbr_bootsel;
int i, item, opt;
int tmo;
daddr_t *off;
int num_bios_disks;
#if (defined(__i386__) || defined(__x86_64__)) && !HAVE_NBTOOL_CONFIG_H
if (dl != NULL) {
num_bios_disks = dl->dl_nbiosdisks;
if (num_bios_disks > MAX_BIOS_DISKS)
num_bios_disks = MAX_BIOS_DISKS;
} else
#endif
num_bios_disks = MAX_BIOS_DISKS;
printf("\nBoot selector configuration:\n");
/* The timeout value is in ticks, ~18.2 Hz. Avoid using floats.
* Ticks are nearly 64k/3600 - so our long timers are sligtly out!
* Newer bootcode always waits for 1 tick, so treats 0xffff
* as wait forever.
*/
tmo = le16toh(mbs->mbrbs_timeo);
tmo = tmo == 0xffff ? -1 : (10 * tmo + 9) / 182;
tmo = decimal("Timeout value (0 to 3600 seconds, -1 => never)",
tmo, 0, -1, 3600);
mbs->mbrbs_timeo = htole16(tmo == -1 ? 0xffff : (tmo * 182) / 10);
off = calloc(1 + MBR_PART_COUNT + ext.num_ptn + num_bios_disks, sizeof *off);
if (off == NULL)
err(1, "Malloc failed");
printf("Select the default boot option. Options are:\n\n");
item = 0;
opt = 0;
off[opt] = DEFAULT_ACTIVE;
printf("%d: The first active partition\n", opt);
for (i = 0; i < MBR_PART_COUNT; i++) {
if (mboot.mbr_parts[i].mbrp_type == 0)
continue;
if (mbs->mbrbs_nametab[i][0] == 0)
continue;
printf("%d: %s\n", ++opt, &mbs->mbrbs_nametab[i][0]);
off[opt] = le32toh(mboot.mbr_parts[i].mbrp_start);
if (off[opt] == default_ptn)
item = opt;
}
if (mbs->mbrbs_flags & MBR_BS_EXTLBA) {
for (i = 0; i < ext.num_ptn; i++) {
if (ext.ptn[i].mbr_parts[0].mbrp_type == 0)
continue;
if (ext.ptn[i].mbr_bootsel.mbrbs_nametab[0][0] == 0)
continue;
printf("%d: %s\n",
++opt, ext.ptn[i].mbr_bootsel.mbrbs_nametab[0]);
off[opt] = ext_offset(i) +
le32toh(ext.ptn[i].mbr_parts[0].mbrp_start);
if (off[opt] == default_ptn)
item = opt;
}
}
for (i = 0; i < num_bios_disks; i++) {
printf("%d: Harddisk %d\n", ++opt, i);
off[opt] = DEFAULT_DISK(i);
if (DEFAULT_DISK(i) == default_ptn)
item = opt;
}
item = decimal("Default boot option", item, 0, 0, opt);
default_ptn = off[item];
free(off);
return default_ptn;
}
#endif /* BOOTSEL */
/* 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 routine is only used for non-x86 systems or when we fail to
* get the BIOS geometry from the kernel.
*/
void
intuit_translated_geometry(void)
{
uint32_t xcylinders;
int xheads = -1, xsectors = -1, i, j;
unsigned int c1, h1, s1, c2, h2, s2;
unsigned long a1, a2;
uint64_t num, denom;
/*
* The physical parameters may be invalid as bios geometry.
* If we cannot determine the actual bios geometry, we are
* better off picking a likely 'faked' geometry than leaving
* the invalid physical one.
*/
if (dos_cylinders > MAXCYL || dos_heads > MAXHEAD ||
dos_sectors > MAXSECTOR) {
h1 = MAXHEAD - 1;
c1 = MAXCYL - 1;
#if (defined(__i386__) || defined(__x86_64__)) && !HAVE_NBTOOL_CONFIG_H
if (dl != NULL) {
/* BIOS may use 256 heads or 1024 cylinders */
for (i = 0; i < dl->dl_nbiosdisks; i++) {
if (h1 < (unsigned int)dl->dl_biosdisks[i].bi_head)
h1 = dl->dl_biosdisks[i].bi_head;
if (c1 < (unsigned int)dl->dl_biosdisks[i].bi_cyl)
c1 = dl->dl_biosdisks[i].bi_cyl;
}
}
#endif
dos_sectors = MAXSECTOR;
dos_heads = h1;
dos_cylinders = disklabel.d_secperunit / (MAXSECTOR * h1);
if (dos_cylinders > c1)
dos_cylinders = c1;
}
/* Try to deduce the number of heads from two different mappings. */
for (i = 0; i < MBR_PART_COUNT * 2 - 1; i++) {
if (get_mapping(i, &c1, &h1, &s1, &a1) < 0)
continue;
a1 -= s1;
for (j = i + 1; j < MBR_PART_COUNT * 2; j++) {
if (get_mapping(j, &c2, &h2, &s2, &a2) < 0)
continue;
a2 -= s2;
num = (uint64_t)h1 * a2 - (uint64_t)h2 * a1;
denom = (uint64_t)c2 * a1 - (uint64_t)c1 * a2;
if (denom != 0 && num != 0 && num % denom == 0) {
xheads = num / denom;
xsectors = a1 / (c1 * xheads + h1);
break;
}
}
if (xheads != -1)
break;
}
if (xheads == -1) {
warnx("Cannot determine the number of heads");
return;
}
if (xsectors == -1) {
warnx("Cannot determine the number of sectors");
return;
}
/* Estimate the number of cylinders. */
xcylinders = disklabel.d_secperunit / xheads / xsectors;
if (disklabel.d_secperunit > xcylinders * xheads * xsectors)
xcylinders++;
/*
* 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 < MBR_PART_COUNT * 2; i++) {
if (get_mapping(i, &c1, &h1, &s1, &a1) < 0)
continue;
if (c1 >= MAXCYL - 2)
continue;
if (xsectors * (c1 * xheads + h1) + s1 != a1)
return;
}
/* Everything checks out.
* Reset the geometry to use for further calculations.
* But cylinders cannot be > 1024.
*/
if (xcylinders > MAXCYL)
dos_cylinders = MAXCYL;
else
dos_cylinders = xcylinders;
dos_heads = xheads;
dos_sectors = xsectors;
}
/*
* 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(int i, unsigned int *cylinder, unsigned int *head, unsigned int *sector,
unsigned long *absolute)
{
struct mbr_partition *part = &mboot.mbr_parts[i / 2];
if (part->mbrp_type == 0)
return -1;
if (i % 2 == 0) {
*cylinder = MBR_PCYL(part->mbrp_scyl, part->mbrp_ssect);
*head = part->mbrp_shd;
*sector = MBR_PSECT(part->mbrp_ssect);
*absolute = le32toh(part->mbrp_start);
} else {
*cylinder = MBR_PCYL(part->mbrp_ecyl, part->mbrp_esect);
*head = part->mbrp_ehd;
*sector = MBR_PSECT(part->mbrp_esect);
*absolute = le32toh(part->mbrp_start)
+ le32toh(part->mbrp_size) - 1;
}
/* Sanity check the data against all zeroes */
if ((*cylinder == 0) && (*sector == 0) && (*head == 0))
return -1;
/* sector numbers in the MBR partition table start at 1 */
*sector = *sector - 1;
/* Sanity check the data against max values */
if ((((*cylinder * MAXHEAD) + *head) * MAXSECTOR + *sector) < *absolute)
/* cannot be a CHS mapping */
return -1;
return 0;
}
static void
delete_ptn(int part)
{
if (part == ext.ptn_id) {
/* forget all about the extended partition */
free(ext.ptn);
memset(&ext, 0, sizeof ext);
}
mboot.mbr_parts[part].mbrp_type = 0;
}
static void
delete_ext_ptn(int part)
{
if (part == 0) {
ext.ptn[0].mbr_parts[0].mbrp_type = 0;
return;
}
ext.ptn[part - 1].mbr_parts[1] = ext.ptn[part].mbr_parts[1];
memmove(&ext.ptn[part], &ext.ptn[part + 1],
(ext.num_ptn - part - 1) * sizeof ext.ptn[0]);
ext.num_ptn--;
}
static int
add_ext_ptn(daddr_t start, daddr_t size)
{
int part;
struct mbr_partition *partp;
struct mbr_sector *nptn;
nptn = realloc(ext.ptn, (ext.num_ptn + 1) * sizeof *ext.ptn);
if (!nptn)
err(1, "realloc");
ext.ptn = nptn;
for (part = 0; part < ext.num_ptn; part++)
if (ext_offset(part) > start)
break;
/* insert before 'part' - make space... */
memmove(&ext.ptn[part + 1], &ext.ptn[part],
(ext.num_ptn - part) * sizeof ext.ptn[0]);
memset(&ext.ptn[part], 0, sizeof ext.ptn[0]);
ext.ptn[part].mbr_magic = LE_MBR_MAGIC;
/* we will be 'part' */
if (part == 0) {
/* link us to 'next' */
partp = &ext.ptn[0].mbr_parts[1];
/* offset will be fixed by caller */
partp->mbrp_size = htole32(
le32toh(ext.ptn[1].mbr_parts[0].mbrp_start) +
le32toh(ext.ptn[1].mbr_parts[0].mbrp_size));
} else {
/* link us to prev's next */
partp = &ext.ptn[part - 1].mbr_parts[1];
ext.ptn[part].mbr_parts[1] = *partp;
/* and prev onto us */
partp->mbrp_start = htole32(start - ptn_offset - ext.base);
partp->mbrp_size = htole32(size + ptn_offset);
}
partp->mbrp_type = 5; /* as used by win98 */
partp->mbrp_flag = 0;
/* wallop in some CHS values - win98 doesn't saturate them */
dos(le32toh(partp->mbrp_start),
&partp->mbrp_scyl, &partp->mbrp_shd, &partp->mbrp_ssect);
dos(le32toh(partp->mbrp_start) + le32toh(partp->mbrp_size) - 1,
&partp->mbrp_ecyl, &partp->mbrp_ehd, &partp->mbrp_esect);
ext.num_ptn++;
return part;
}
static const char *
check_overlap(int part, int sysid, daddr_t start, daddr_t size, int fix)
{
int p;
unsigned int p_s, p_e;
if (sysid != 0) {
if (start == 0)
return "Sector zero is reserved for the MBR";
#if 0
if (start < ptn_offset)
/* This is just a convention, not a requirement */
return "Track zero is reserved for the BIOS";
#endif
if (start + size > disksectors)
return "Partition exceeds size of disk";
for (p = 0; p < MBR_PART_COUNT; p++) {
if (p == part || mboot.mbr_parts[p].mbrp_type == 0)
continue;
p_s = le32toh(mboot.mbr_parts[p].mbrp_start);
p_e = p_s + le32toh(mboot.mbr_parts[p].mbrp_size);
if (start + size <= p_s || start >= p_e)
continue;
if (f_flag) {
if (fix)
delete_ptn(p);
return 0;
}
return "Overlaps another partition";
}
}
/* Are we trying to create an extended partition */
if (!MBR_IS_EXTENDED(mboot.mbr_parts[part].mbrp_type)) {
/* this wasn't the extended partition */
if (!MBR_IS_EXTENDED(sysid))
return 0;
/* making an extended partition */
if (ext.base != 0) {
if (!f_flag)
return "There cannot be 2 extended partitions";
if (fix)
delete_ptn(ext.ptn_id);
}
if (fix) {
/* allocate a new extended partition */
ext.ptn = calloc(1, sizeof ext.ptn[0]);
if (ext.ptn == NULL)
err(1, "Malloc failed");
ext.ptn[0].mbr_magic = LE_MBR_MAGIC;
ext.ptn_id = part;
ext.base = start;
ext.limit = start + size;
ext.num_ptn = 1;
}
return 0;
}
/* Check we haven't cut space allocated to an extended ptn */
if (!MBR_IS_EXTENDED(sysid)) {
/* no longer an extended partition */
if (fix) {
/* Kill all memory of the extended partitions */
delete_ptn(part);
return 0;
}
if (ext.num_ptn == 0 ||
(ext.num_ptn == 1 && ext.ptn[0].mbr_parts[0].mbrp_type == 0))
/* nothing in extended partition */
return 0;
if (f_flag)
return 0;
if (yesno("Do you really want to delete all the extended partitions?"))
return 0;
return "Extended partition busy";
}
if (le32toh(mboot.mbr_parts[part].mbrp_start) != ext.base)
/* maybe impossible, but an extra sanity check */
return 0;
for (p = ext.num_ptn; --p >= 0;) {
if (ext.ptn[p].mbr_parts[0].mbrp_type == 0)
continue;
p_s = ext_offset(p);
p_e = p_s + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start)
+ le32toh(ext.ptn[p].mbr_parts[0].mbrp_size);
if (p_s >= start && p_e <= start + size)
continue;
if (!f_flag)
return "Extended partition outside main partition";
if (fix)
delete_ext_ptn(p);
}
if (fix && start != ext.base) {
/* The internal offsets need to be fixed up */
for (p = 0; p < ext.num_ptn - 1; p++)
ext.ptn[p].mbr_parts[1].mbrp_start = htole32(
le32toh(ext.ptn[p].mbr_parts[1].mbrp_start)
+ ext.base - start);
/* and maybe an empty partition at the start */
if (ext.ptn[0].mbr_parts[0].mbrp_type == 0) {
if (le32toh(ext.ptn[0].mbr_parts[1].mbrp_start) == 0) {
/* don't need the empty slot */
memmove(&ext.ptn[0], &ext.ptn[1],
(ext.num_ptn - 1) * sizeof ext.ptn[0]);
ext.num_ptn--;
}
} else {
/* must create an empty slot */
add_ext_ptn(start, ptn_offset);
ext.ptn[0].mbr_parts[1].mbrp_start = htole32(ext.base
- start);
}
}
if (fix) {
ext.base = start;
ext.limit = start + size;
}
return 0;
}
static const char *
check_ext_overlap(int part, int sysid, daddr_t start, daddr_t size, int fix)
{
int p;
unsigned int p_s, p_e;
if (sysid == 0)
return 0;
if (MBR_IS_EXTENDED(sysid))
return "Nested extended partitions are not allowed";
/* allow one track at start for extended partition header */
start -= ptn_offset;
size += ptn_offset;
if (start < ext.base || start + size > ext.limit)
return "Outside bounds of extended partition";
if (f_flag && !fix)
return 0;
for (p = ext.num_ptn; --p >= 0;) {
if (p == part || ext.ptn[p].mbr_parts[0].mbrp_type == 0)
continue;
p_s = ext_offset(p);
p_e = p_s + le32toh(ext.ptn[p].mbr_parts[0].mbrp_start)
+ le32toh(ext.ptn[p].mbr_parts[0].mbrp_size);
if (p == 0)
p_s += le32toh(ext.ptn[p].mbr_parts[0].mbrp_start)
- ptn_offset;
if (start < p_e && start + size > p_s) {
if (!f_flag)
return "Overlaps another extended partition";
if (fix) {
if (part == -1)
delete_ext_ptn(p);
else
/* must not change numbering yet */
ext.ptn[p].mbr_parts[0].mbrp_type = 0;
}
}
}
return 0;
}
int
change_part(int extended, int part, int sysid, daddr_t start, daddr_t size,
char *bootmenu)
{
struct mbr_partition *partp;
struct mbr_sector *boot;
daddr_t offset;
const char *e;
int upart = part;
int p;
int fl;
daddr_t n_s, n_e;
const char *errtext;
#ifdef BOOTSEL
char tmp_bootmenu[MBR_PART_COUNT * (MBR_BS_PARTNAMESIZE + 1)];
int bootmenu_len = (extended ? MBR_PART_COUNT : 1) * (MBR_BS_PARTNAMESIZE + 1);
#endif
if (extended) {
if (part != -1 && part < ext.num_ptn) {
boot = &ext.ptn[part];
partp = &boot->mbr_parts[0];
offset = ext_offset(part);
} else {
part = -1;
boot = 0;
partp = 0;
offset = 0;
}
upart = 0;
e = "E";
} else {
boot = &mboot;
partp = &boot->mbr_parts[part];
offset = 0;
e = "";
}
if (!f_flag && part != -1) {
printf("The data for partition %s%d is:\n", e, part);
print_part(boot, upart, offset);
}
#ifdef BOOTSEL
if (bootmenu != NULL)
strlcpy(tmp_bootmenu, bootmenu, bootmenu_len);
else
if (boot != NULL && boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC)
strlcpy(tmp_bootmenu,
boot->mbr_bootsel.mbrbs_nametab[upart],
bootmenu_len);
else
tmp_bootmenu[0] = 0;
#endif
if (!s_flag && partp != NULL) {
/* values not specified, default to current ones */
sysid = partp->mbrp_type;
start = offset + le32toh(partp->mbrp_start);
size = le32toh(partp->mbrp_size);
}
/* creating a new partition, default to free space */
if (!s_flag && sysid == 0 && extended) {
/* non-extended partition */
start = ext.base;
for (p = 0; p < ext.num_ptn; p++) {
if (ext.ptn[p].mbr_parts[0].mbrp_type == 0)
continue;
n_s = ext_offset(p);
if (n_s > start + ptn_offset)
break;
start = ext_offset(p)
+ le32toh(ext.ptn[p].mbr_parts[0].mbrp_start)
+ le32toh(ext.ptn[p].mbr_parts[0].mbrp_size);
}
if (ext.limit - start <= ptn_offset) {
printf("No space in extended partition\n");
return 0;
}
start += ptn_offset;
}
if (!s_flag && sysid == 0 && !extended) {
/* same for non-extended partition */
/* first see if old start is free */
if (start < ptn_offset)
start = 0;
for (p = 0; start != 0 && p < MBR_PART_COUNT; p++) {
if (mboot.mbr_parts[p].mbrp_type == 0)
continue;
n_s = le32toh(mboot.mbr_parts[p].mbrp_start);
if (start >= n_s &&
start < n_s + le32toh(mboot.mbr_parts[p].mbrp_size))
start = 0;
}
if (start == 0) {
/* Look for first gap */
start = ptn_offset;
for (p = 0; p < MBR_PART_COUNT; p++) {
if (mboot.mbr_parts[p].mbrp_type == 0)
continue;
n_s = le32toh(mboot.mbr_parts[p].mbrp_start);
n_e = n_s + le32toh(mboot.mbr_parts[p].mbrp_size);
if (start >= n_s && start < n_e) {
start = n_e;
p = -1;
}
}
if (start >= disksectors) {
printf("No free space\n");
return 0;
}
}
}
if (!f_flag) {
/* request new values from user */
if (sysid == 0)
sysid = 169;
sysid = decimal("sysid", sysid, 0, 0, 255);
if (sysid == 0 && !v_flag) {
start = 0;
size = 0;
#ifdef BOOTSEL
tmp_bootmenu[0] = 0;
#endif
} else {
daddr_t old = start;
daddr_t lim = extended ? ext.limit : disksectors;
start = decimal("start", start,
DEC_SEC | DEC_RND_0 | (extended ? DEC_RND : 0),
extended ? ext.base : 0, lim);
/* Adjust 'size' so that end doesn't move when 'start'
* is only changed slightly.
*/
if (size > start - old)
size -= start - old;
else
size = 0;
/* Find end of available space from this start point */
if (extended) {
for (p = 0; p < ext.num_ptn; p++) {
if (p == part)
continue;
if (ext.ptn[p].mbr_parts[0].mbrp_type == 0)
continue;
n_s = ext_offset(p);
if (n_s > start && n_s < lim)
lim = n_s;
if (start >= n_s && start < n_s
+ le32toh(ext.ptn[p].mbr_parts[0].mbrp_start)
+ le32toh(ext.ptn[p].mbr_parts[0].mbrp_size)) {
lim = start;
break;
}
}
} else {
for (p = 0; p < MBR_PART_COUNT; p++) {
if (p == part)
continue;
if (mboot.mbr_parts[p].mbrp_type == 0)
continue;
n_s = le32toh(mboot.mbr_parts[p].mbrp_start);
if (n_s > start && n_s < lim)
lim = n_s;
if (start >= n_s && start < n_s
+ le32toh(mboot.mbr_parts[p].mbrp_size)) {
lim = start;
break;
}
}
}
lim -= start;
if (lim == 0) {
printf("Start sector already allocated\n");
return 0;
}
if (size == 0 || size > lim)
size = lim;
fl = DEC_SEC;
if (start % ptn_alignment == ptn_offset)
fl |= DEC_RND_DOWN;
if (start == 2 * ptn_offset)
fl |= DEC_RND_DOWN | DEC_RND_DOWN_2;
size = decimal("size", size, fl, 0, lim);
#ifdef BOOTSEL
#ifndef DEFAULT_BOOTEXTCODE
if (!extended)
#endif
string("bootmenu", bootmenu_len, tmp_bootmenu);
#endif
}
}
/*
* Before we write these away, we must verify that nothing
* untoward has been requested.
*/
if (extended)
errtext = check_ext_overlap(part, sysid, start, size, 0);
else
errtext = check_overlap(part, sysid, start, size, 0);
if (errtext != NULL) {
if (f_flag)
errx(2, "%s\n", errtext);
printf("%s\n", errtext);
return 0;
}
/*
* Before proceeding, delete any overlapped partitions.
* This can only happen if '-f' was supplied on the command line.
* Just hope the caller knows what they are doing.
* This also fixes the base of each extended partition if the
* partition itself has moved.
*/
if (extended)
errtext = check_ext_overlap(part, sysid, start, size, 1);
else
errtext = check_overlap(part, sysid, start, size, 1);
if (errtext)
errx(1, "%s\n", errtext);
if (sysid == 0) {
/* delete this partition - save info though */
if (partp == NULL)
/* must have been trying to create an extended ptn */
return 0;
if (start == 0 && size == 0)
memset(partp, 0, sizeof *partp);
#ifdef BOOTSEL
if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC)
memset(boot->mbr_bootsel.mbrbs_nametab[upart], 0,
sizeof boot->mbr_bootsel.mbrbs_nametab[0]);
#endif
if (extended)
delete_ext_ptn(part);
else
delete_ptn(part);
return 1;
}
if (extended) {
if (part != -1)
delete_ext_ptn(part);
if (start == ext.base + ptn_offset)
/* First one must have been free */
part = 0;
else
part = add_ext_ptn(start, size);
/* These must be re-calculated because of the realloc */
boot = &ext.ptn[part];
partp = &boot->mbr_parts[0];
offset = ext_offset(part);
}
partp->mbrp_type = sysid;
partp->mbrp_start = htole32( start - offset);
partp->mbrp_size = htole32( size);
dos(start, &partp->mbrp_scyl, &partp->mbrp_shd, &partp->mbrp_ssect);
dos(start + size - 1,
&partp->mbrp_ecyl, &partp->mbrp_ehd, &partp->mbrp_esect);
#ifdef BOOTSEL
if (extended) {
boot->mbr_bootsel_magic = LE_MBR_BS_MAGIC;
strncpy(boot->mbr_bootsel.mbrbs_nametab[upart], tmp_bootmenu,
bootmenu_len);
} else {
/* We need to bootselect code installed in order to have
* somewhere to safely write the menu tag.
*/
if (boot->mbr_bootsel_magic != LE_MBR_BS_MAGIC) {
if (f_flag ||
yesno("The bootselect code is not installed, "
"do you want to install it now?"))
install_bootsel(MBR_BS_ACTIVE);
}
if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) {
strncpy(boot->mbr_bootsel.mbrbs_nametab[upart],
tmp_bootmenu, bootmenu_len);
}
}
#endif
if (v_flag && !f_flag && yesno("Explicitly specify beg/end address?")) {
/* this really isn't a good idea.... */
int tsector, tcylinder, thead;
tcylinder = MBR_PCYL(partp->mbrp_scyl, partp->mbrp_ssect);
thead = partp->mbrp_shd;
tsector = MBR_PSECT(partp->mbrp_ssect);
tcylinder = decimal("beginning cylinder",
tcylinder, 0, 0, dos_cylinders - 1);
thead = decimal("beginning head",
thead, 0, 0, dos_heads - 1);
tsector = decimal("beginning sector",
tsector, 0, 1, dos_sectors);
partp->mbrp_scyl = DOSCYL(tcylinder);
partp->mbrp_shd = thead;
partp->mbrp_ssect = DOSSECT(tsector, tcylinder);
tcylinder = MBR_PCYL(partp->mbrp_ecyl, partp->mbrp_esect);
thead = partp->mbrp_ehd;
tsector = MBR_PSECT(partp->mbrp_esect);
tcylinder = decimal("ending cylinder",
tcylinder, 0, 0, dos_cylinders - 1);
thead = decimal("ending head",
thead, 0, 0, dos_heads - 1);
tsector = decimal("ending sector",
tsector, 0, 1, dos_sectors);
partp->mbrp_ecyl = DOSCYL(tcylinder);
partp->mbrp_ehd = thead;
partp->mbrp_esect = DOSSECT(tsector, tcylinder);
}
/* If we had to mark an extended partition as deleted because
* another request would have overlapped it, now is the time
* to do the actual delete.
*/
if (extended && f_flag) {
for (p = ext.num_ptn; --p >= 0;)
if (ext.ptn[p].mbr_parts[0].mbrp_type == 0)
delete_ext_ptn(p);
}
return 1;
}
void
print_params(void)
{
if (sh_flag) {
printf("DISK=%s\n", disk);
printf("DLCYL=%d\nDLHEAD=%d\nDLSEC=%d\nDLSIZE=%"PRIdaddr"\n",
cylinders, heads, sectors, disksectors);
printf("BCYL=%d\nBHEAD=%d\nBSEC=%d\nBDLSIZE=%"PRIdaddr"\n",
dos_cylinders, dos_heads, dos_sectors, dos_disksectors);
printf("NUMEXTPTN=%d\n", ext.num_ptn);
return;
}
/* Not sh_flag */
printf("Disk: %s\n", disk);
printf("NetBSD disklabel disk geometry:\n");
printf("cylinders: %d, heads: %d, sectors/track: %d "
"(%d sectors/cylinder)\ntotal sectors: %"PRIdaddr"\n\n",
cylinders, heads, sectors, cylindersectors, disksectors);
printf("BIOS disk geometry:\n");
printf("cylinders: %d, heads: %d, sectors/track: %d "
"(%d sectors/cylinder)\ntotal sectors: %"PRIdaddr"\n\n",
dos_cylinders, dos_heads, dos_sectors, dos_cylindersectors,
dos_disksectors);
}
/* Find the first active partition, else return MBR_PART_COUNT */
int
first_active(void)
{
struct mbr_partition *partp = &mboot.mbr_parts[0];
int part;
for (part = 0; part < MBR_PART_COUNT; part++)
if (partp[part].mbrp_flag & MBR_PFLAG_ACTIVE)
return part;
return MBR_PART_COUNT;
}
void
change_active(int which)
{
struct mbr_partition *partp;
int part;
int active = MBR_PART_COUNT;
partp = &mboot.mbr_parts[0];
if (a_flag && which != -1)
active = which;
else
active = first_active();
if (!f_flag) {
if (yesno("Do you want to change the active partition?")) {
printf ("Choosing %d will make no partition active.\n",
MBR_PART_COUNT);
do {
active = decimal("active partition",
active, 0, 0, MBR_PART_COUNT);
} while (!yesno("Are you happy with this choice?"));
} else
return;
} else
if (active != MBR_PART_COUNT)
printf ("Making partition %d active.\n", active);
for (part = 0; part < MBR_PART_COUNT; part++)
partp[part].mbrp_flag &= ~MBR_PFLAG_ACTIVE;
if (active < MBR_PART_COUNT)
partp[active].mbrp_flag |= MBR_PFLAG_ACTIVE;
}
void
get_params_to_use(void)
{
#if defined(__i386__) || defined(__x86_64__)
struct biosdisk_info *bip;
int i;
#endif
if (b_flag) {
dos_cylinders = b_cyl;
dos_heads = b_head;
dos_sectors = b_sec;
return;
}
print_params();
if (!yesno("Do you want to change our idea of what BIOS thinks?"))
return;
#if (defined(__i386__) || defined(__x86_64__)) && !HAVE_NBTOOL_CONFIG_H
if (dl != NULL) {
for (i = 0; i < dl->dl_nbiosdisks; i++) {
if (i == 0)
printf("\nGeometries of known disks:\n");
bip = &dl->dl_biosdisks[i];
printf("Disk %d: cylinders %u, heads %u, sectors %u"
" (%"PRIdaddr" sectors, %dMB)\n",
i, bip->bi_cyl, bip->bi_head, bip->bi_sec,
bip->bi_lbasecs, SEC_TO_MB(bip->bi_lbasecs));
}
printf("\n");
}
#endif
do {
dos_cylinders = decimal("BIOS's idea of #cylinders",
dos_cylinders, 0, 0, MAXCYL);
dos_heads = decimal("BIOS's idea of #heads",
dos_heads, 0, 0, MAXHEAD);
dos_sectors = decimal("BIOS's idea of #sectors",
dos_sectors, 0, 1, MAXSECTOR);
print_params();
} while (!yesno("Are you happy with this choice?"));
}
/***********************************************\
* Change real numbers into strange dos numbers *
\***********************************************/
void
dos(int sector, unsigned char *cylinderp, unsigned char *headp,
unsigned char *sectorp)
{
int cylinder, head;
cylinder = sector / dos_cylindersectors;
sector -= cylinder * dos_cylindersectors;
head = sector / dos_sectors;
sector -= head * dos_sectors;
if (cylinder > 1023)
cylinder = 1023;
*cylinderp = DOSCYL(cylinder);
*headp = head;
*sectorp = DOSSECT(sector + 1, cylinder);
}
int
open_disk(int update)
{
static char namebuf[MAXPATHLEN + 1];
int flags = update && disk_file == NULL ? O_RDWR : O_RDONLY;
if (!F_flag) {
fd = opendisk(disk, flags, namebuf, sizeof(namebuf), 0);
if (fd < 0) {
if (errno == ENODEV)
warnx("%s is not a character device", namebuf);
else
warn("cannot opendisk %s", namebuf);
return (-1);
}
disk = namebuf;
} else {
fd = open(disk, flags, 0);
if (fd == -1) {
warn("cannot open %s", disk);
return -1;
}
}
if (get_params() == -1) {
close(fd);
fd = -1;
return (-1);
}
if (disk_file != NULL) {
/* for testing: read/write data from a disk file */
wfd = open(disk_file, update ? O_RDWR|O_CREAT : O_RDONLY, 0777);
if (wfd == -1) {
warn("%s", disk_file);
close(fd);
fd = -1;
return -1;
}
} else
wfd = fd;
return (0);
}
int
read_disk(daddr_t sector, void *buf)
{
if (*rfd == -1)
errx(1, "read_disk(); fd == -1");
if (lseek(*rfd, sector * (off_t)512, 0) == -1)
return (-1);
return (read(*rfd, buf, 512));
}
int
write_disk(daddr_t sector, void *buf)
{
if (wfd == -1)
errx(1, "write_disk(); wfd == -1");
if (lseek(wfd, sector * (off_t)512, 0) == -1)
return (-1);
return (write(wfd, buf, 512));
}
static void
guess_geometry(daddr_t _sectors)
{
dos_sectors = MAXSECTOR;
dos_heads = MAXHEAD - 1; /* some BIOS might use 256 */
dos_cylinders = _sectors / (MAXSECTOR * (MAXHEAD - 1));
if (dos_cylinders < 1)
dos_cylinders = 1;
else if (dos_cylinders > MAXCYL - 1)
dos_cylinders = MAXCYL - 1;
}
int
get_params(void)
{
if (disk_type != NULL) {
struct disklabel *tmplabel;
if ((tmplabel = getdiskbyname(disk_type)) == NULL) {
warn("bad disktype");
return (-1);
}
disklabel = *tmplabel;
} else if (F_flag) {
struct stat st;
if (fstat(fd, &st) == -1) {
warn("fstat");
return (-1);
}
if (st.st_size % 512 != 0) {
warnx("%s size (%lld) is not divisible "
"by sector size (%d)", disk, (long long)st.st_size,
512);
}
disklabel.d_secperunit = st.st_size / 512;
guess_geometry(disklabel.d_secperunit);
disklabel.d_ncylinders = dos_cylinders;
disklabel.d_ntracks = dos_heads;
disklabel.d_nsectors = dos_sectors;
} else if (ioctl(fd, DIOCGDEFLABEL, &disklabel) == -1) {
warn("DIOCGDEFLABEL");
if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) {
warn("DIOCGDINFO");
return (-1);
}
}
disksectors = disklabel.d_secperunit;
cylinders = disklabel.d_ncylinders;
heads = disklabel.d_ntracks;
sectors = disklabel.d_nsectors;
/* pick up some defaults for the BIOS sizes */
if (sectors <= MAXSECTOR) {
dos_cylinders = cylinders;
dos_heads = heads;
dos_sectors = sectors;
} else {
/* guess - has to better than the above */
guess_geometry(disksectors);
}
dos_disksectors = disksectors;
return (0);
}
#ifdef BOOTSEL
/*
* Rather unfortunately the bootsel 'magic' number is at the end of the
* the structure, and there is no checksum. So when other operating
* systems install mbr code by only writing the length of their code they
* can overwrite part of the structure but keeping the magic number intact.
* This code attempts to empirically detect this problem.
*/
static int
validate_bootsel(struct mbr_bootsel *mbs)
{
unsigned int key = mbs->mbrbs_defkey;
unsigned int tmo;
size_t i;
if (v_flag)
return 0;
/*
* Check default key is sane
* - this is the most likely field to be stuffed
* 16 disks and 16 bootable partitions seems enough!
* (the keymap decode starts falling apart at that point)
*/
if (mbs->mbrbs_flags & MBR_BS_ASCII) {
if (key != 0 && !(key == '\r'
|| (key >= '1' && key < '1' + MAX_BIOS_DISKS)
|| (key >= 'a' && key < 'a' + MAX_BIOS_DISKS)))
return 1;
} else {
if (key != 0 && !(key == SCAN_ENTER
|| (key >= SCAN_1 && key < SCAN_1 + MAX_BIOS_DISKS)
|| (key >= SCAN_F1 && key < SCAN_F1 + MAX_BIOS_DISKS)))
return 1;
}
/* Checking the flags will lead to breakage... */
/* Timeout value is expected to be a multiple of a second */
tmo = htole16(mbs->mbrbs_timeo);
if (tmo != 0 && tmo != 0xffff && tmo != (10 * tmo + 9) / 182 * 182 / 10)
return 2;
/* Check the menu strings are printable */
/* Unfortunately they aren't zero filled... */
for (i = 0; i < sizeof(mbs->mbrbs_nametab); i++) {
int c = (uint8_t)mbs->mbrbs_nametab[0][i];
if (c == 0 || isprint(c))
continue;
return 3;
}
return 0;
}
#endif
int
read_s0(daddr_t offset, struct mbr_sector *boot)
{
const char *tabletype = offset ? "extended" : "primary";
#ifdef BOOTSEL
static int reported;
#endif
if (read_disk(offset, boot) == -1) {
warn("Can't read %s partition table", tabletype);
return -1;
}
if (boot->mbr_magic != LE_MBR_MAGIC) {
warnx("%s partition table invalid, "
"no magic in sector %"PRIdaddr, tabletype, offset);
return -1;
}
#ifdef BOOTSEL
if (boot->mbr_bootsel_magic == LE_MBR_BS_MAGIC) {
/* mbr_bootsel in new location */
if (validate_bootsel(&boot->mbr_bootsel)) {
warnx("removing corrupt bootsel information");
boot->mbr_bootsel_magic = 0;
}
return 0;
}
if (boot->mbr_bootsel_magic != LE_MBR_MAGIC)
return 0;
/* mbr_bootsel in old location */
if (!reported)
warnx("%s partition table: using old-style bootsel information",
tabletype);
reported = 1;
if (validate_bootsel((void *)((uint8_t *)boot + MBR_BS_OFFSET + 4))) {
warnx("%s bootsel information corrupt - ignoring", tabletype);
return 0;
}
memmove((uint8_t *)boot + MBR_BS_OFFSET,
(uint8_t *)boot + MBR_BS_OFFSET + 4,
sizeof(struct mbr_bootsel));
if ( ! (boot->mbr_bootsel.mbrbs_flags & MBR_BS_NEWMBR)) {
/* old style default key */
int id;
/* F1..F4 => ptn 0..3, F5+ => disk 0+ */
id = boot->mbr_bootsel.mbrbs_defkey;
id -= SCAN_F1;
if (id >= MBR_PART_COUNT)
id -= MBR_PART_COUNT; /* Use number of disk */
else if (mboot.mbr_parts[id].mbrp_type != 0)
id = le32toh(boot->mbr_parts[id].mbrp_start);
else
id = DEFAULT_ACTIVE;
boot->mbr_bootsel.mbrbs_defkey = id;
}
boot->mbr_bootsel_magic = LE_MBR_BS_MAGIC;
/* highlight that new bootsel code is necessary */
boot->mbr_bootsel.mbrbs_flags &= ~MBR_BS_NEWMBR;
#endif /* BOOTSEL */
return 0;
}
int
write_mbr(void)
{
int flag, i;
daddr_t offset;
int rval = -1;
/*
* 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 (wfd == fd && F_flag == 0 && ioctl(wfd, DIOCWLABEL, &flag) < 0)
warn("DIOCWLABEL");
if (write_disk(0, &mboot) == -1) {
warn("Can't write fdisk partition table");
goto protect_label;
}
if (boot_installed)
for (i = bootsize; (i -= 0x200) > 0;)
if (write_disk(i / 0x200, &bootcode[i / 0x200]) == -1) {
warn("Can't write bootcode");
goto protect_label;
}
for (offset = 0, i = 0; i < ext.num_ptn; i++) {
if (write_disk(ext.base + offset, ext.ptn + i) == -1) {
warn("Can't write %dth extended partition", i);
goto protect_label;
}
offset = le32toh(ext.ptn[i].mbr_parts[1].mbrp_start);
}
rval = 0;
protect_label:
flag = 0;
if (wfd == fd && F_flag == 0 && ioctl(wfd, DIOCWLABEL, &flag) < 0)
warn("DIOCWLABEL");
return rval;
}
int
yesno(const char *str, ...)
{
int ch, first;
va_list ap;
va_start(ap, str);
vprintf(str, ap);
printf(" [n] ");
first = ch = getchar();
while (ch != '\n' && ch != EOF)
ch = getchar();
if (ch == EOF)
errx(1, "EOF");
return (first == 'y' || first == 'Y');
}
int
decimal(const char *prompt, int64_t dflt, int flags, int64_t minval, int64_t maxval)
{
int64_t acc = 0;
int valid;
int len;
char *cp;
for (;;) {
if (flags & DEC_SEC) {
printf("%s: [%" PRId64 "..%" PRId64 "cyl default: %" PRId64 ", %" PRId64 "cyl, %uMB] ",
prompt, SEC_TO_CYL(minval), SEC_TO_CYL(maxval),
dflt, SEC_TO_CYL(dflt), SEC_TO_MB(dflt));
} else
printf("%s: [%" PRId64 "..%" PRId64 " default: %" PRId64 "] ",
prompt, minval, maxval, dflt);
if (!fgets(lbuf, LBUF, stdin))
errx(1, "EOF");
cp = lbuf;
cp += strspn(cp, " \t");
if (*cp == '\n')
return dflt;
if (cp[0] == '$' && cp[1] == '\n')
return maxval;
if (isdigit((unsigned char)*cp) || *cp == '-') {
acc = strtoll(lbuf, &cp, 10);
len = strcspn(cp, " \t\n");
valid = 0;
if (len != 0 && (flags & DEC_SEC)) {
if (!strncasecmp(cp, "gb", len)) {
acc *= 1024;
valid = 1;
}
if (valid || !strncasecmp(cp, "mb", len)) {
acc *= SEC_IN_1M;
/* round to whole number of cylinders */
acc += ptn_alignment / 2;
acc /= ptn_alignment;
valid = 1;
}
if (valid || !strncasecmp(cp, "cyl", len)) {
acc *= ptn_alignment;
/* adjustments for cylinder boundary */
if (acc == 0 && flags & DEC_RND_0)
acc += ptn_offset;
if (flags & DEC_RND)
acc += ptn_offset;
if (flags & DEC_RND_DOWN)
acc -= ptn_offset;
if (flags & DEC_RND_DOWN_2)
acc -= ptn_offset;
cp += len;
}
}
}
cp += strspn(cp, " \t");
if (*cp != '\n') {
lbuf[strlen(lbuf) - 1] = 0;
printf("%s is not a valid %s number.\n", lbuf,
flags & DEC_SEC ? "sector" : "decimal");
continue;
}
if (acc >= minval && acc <= maxval)
return acc;
printf("%" PRId64 " is not between %" PRId64 " and %" PRId64 ".\n", acc, minval, maxval);
}
}
int
ptn_id(const char *prompt, int *extended)
{
unsigned int acc = 0;
char *cp;
for (;; printf("%s is not a valid partition number.\n", lbuf)) {
printf("%s: [none] ", prompt);
if (!fgets(lbuf, LBUF, stdin))
errx(1, "EOF");
lbuf[strlen(lbuf)-1] = '\0';
cp = lbuf;
cp += strspn(cp, " \t");
*extended = 0;
if (*cp == 0)
return -1;
if (*cp == 'E' || *cp == 'e') {
cp++;
*extended = 1;
}
acc = strtoul(cp, &cp, 10);
cp += strspn(cp, " \t");
if (*cp != '\0')
continue;
if (*extended || acc < MBR_PART_COUNT)
return acc;
}
}
#ifdef BOOTSEL
void
string(const char *prompt, int length, char *buf)
{
int len;
for (;;) {
printf("%s: [%.*s] ", prompt, length, buf);
if (!fgets(lbuf, LBUF, stdin))
errx(1, "EOF");
len = strlen(lbuf);
if (len <= 1)
/* unchanged if just <enter> */
return;
/* now strip trailing spaces, <space><enter> deletes string */
do
lbuf[--len] = 0;
while (len != 0 && lbuf[len - 1] == ' ');
if (len < length)
break;
printf("'%s' is longer than %d characters.\n",
lbuf, length - 1);
}
strncpy(buf, lbuf, length);
}
#endif
int
type_match(const void *key, const void *item)
{
const int *idp = key;
const struct mbr_ptype *ptr = item;
if (*idp < ptr->id)
return (-1);
if (*idp > ptr->id)
return (1);
return (0);
}
const char *
get_type(int type)
{
struct mbr_ptype *ptr;
ptr = bsearch(&type, mbr_ptypes, KNOWN_SYSIDS,
sizeof(mbr_ptypes[0]), type_match);
if (ptr == 0)
return ("unknown");
return (ptr->name);
}
int
read_gpt(daddr_t offset, struct gpt_hdr *gptp)
{
char buf[512];
struct gpt_hdr *hdr = (void *)buf;
const char *tabletype = GPT_TYPE(offset);
if (read_disk(offset, buf) == -1) {
warn("Can't read %s GPT header", tabletype);
return -1;
}
(void)memcpy(gptp, buf, GPT_HDR_SIZE);
/* GPT CRC should be calculated with CRC field preset to zero */
hdr->hdr_crc_self = 0;
if (memcmp(gptp->hdr_sig, GPT_HDR_SIG, sizeof(gptp->hdr_sig))
|| gptp->hdr_lba_self != (uint64_t)offset
|| crc32(0, (void *)hdr, gptp->hdr_size) != gptp->hdr_crc_self) {
/* not a GPT */
(void)memset(gptp, 0, GPT_HDR_SIZE);
}
if (v_flag && gptp->hdr_size != 0) {
printf("Found %s GPT header CRC %"PRIu32" "
"at sector %"PRIdaddr", backup at %"PRIdaddr"\n",
tabletype, gptp->hdr_crc_self, offset, gptp->hdr_lba_alt);
}
return gptp->hdr_size;
}
int
delete_gpt(struct gpt_hdr *gptp)
{
char buf[512];
struct gpt_hdr *hdr = (void *)buf;
if (gptp->hdr_size == 0)
return 0;
/* don't accidently overwrite something important */
if (gptp->hdr_lba_self != GPT_HDR_BLKNO &&
gptp->hdr_lba_self != (uint64_t)disksectors - 1) {
warnx("given GPT header location doesn't seem correct");
return -1;
}
(void)memcpy(buf, gptp, GPT_HDR_SIZE);
/*
* Don't really delete GPT, just "disable" it, so it can
* be recovered later in case of mistake or something
*/
(void)memset(hdr->hdr_sig, 0, sizeof(gptp->hdr_sig));
if (write_disk(gptp->hdr_lba_self, hdr) == -1) {
warn("can't delete %s GPT header",
GPT_TYPE(gptp->hdr_lba_self));
return -1;
}
(void)memset(gptp, 0, GPT_HDR_SIZE);
return 1;
}
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