608 lines
16 KiB
C
608 lines
16 KiB
C
/*
|
|
* Copyright (c) 2008 Luigi Rizzo
|
|
* Copyright (c) 1999 Robert Nordier
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
|
|
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
|
|
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
|
|
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
|
|
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/disklabel.h>
|
|
#include <sys/diskmbr.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <libgeom.h>
|
|
#include <paths.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#define MBRSIZE 512 /* master boot record size */
|
|
|
|
#define OFF_VERSION 0x1b0 /* offset: version number, only boot0version */
|
|
#define OFF_SERIAL 0x1b8 /* offset: volume serial number */
|
|
#define OFF_PTBL 0x1be /* offset: partition table */
|
|
#define OFF_MAGIC 0x1fe /* offset: magic number */
|
|
/*
|
|
* Offsets to the parameters of the 512-byte boot block.
|
|
* For historical reasons they are set as macros
|
|
*/
|
|
struct opt_offsets {
|
|
int opt;
|
|
int drive;
|
|
int flags;
|
|
int ticks;
|
|
};
|
|
|
|
static struct opt_offsets b0_ofs[] = {
|
|
{ 0x0, 0x0, 0x0, 0x0 }, /* no boot block */
|
|
{ 0x1b9, 0x1ba, 0x1bb, 0x1bc }, /* original block */
|
|
{ 0x1b5, 0x1b6, 0x1b7, 0x1bc }, /* NT_SERIAL block */
|
|
};
|
|
|
|
static int b0_ver; /* boot block version set by boot0bs */
|
|
|
|
#define OFF_OPT (b0_ofs[b0_ver].opt) /* default boot option */
|
|
#define OFF_DRIVE (b0_ofs[b0_ver].drive) /* setdrv drive */
|
|
#define OFF_FLAGS (b0_ofs[b0_ver].flags) /* option flags */
|
|
#define OFF_TICKS (b0_ofs[b0_ver].ticks) /* clock ticks */
|
|
|
|
|
|
#define cv2(p) ((p)[0] | (p)[1] << 010)
|
|
|
|
#define mk2(p, x) \
|
|
(p)[0] = (u_int8_t)(x), \
|
|
(p)[1] = (u_int8_t)((x) >> 010)
|
|
|
|
static const struct {
|
|
const char *tok;
|
|
int def;
|
|
} opttbl[] = {
|
|
{"packet", 0},
|
|
{"update", 1},
|
|
{"setdrv", 0}
|
|
};
|
|
static const int nopt = sizeof(opttbl) / sizeof(opttbl[0]);
|
|
|
|
static const char fmt0[] = "# flag start chs type"
|
|
" end chs offset size\n";
|
|
|
|
static const char fmt1[] = "%d 0x%02x %4u:%3u:%2u 0x%02x"
|
|
" %4u:%3u:%2u %10u %10u\n";
|
|
|
|
static int geom_class_available(const char *);
|
|
static int read_mbr(const char *, u_int8_t **, int);
|
|
static void write_mbr(const char *, int, u_int8_t *, int);
|
|
static void display_mbr(u_int8_t *);
|
|
static int boot0version(const u_int8_t *);
|
|
static int boot0bs(const u_int8_t *);
|
|
static void stropt(const char *, int *, int *);
|
|
static int argtoi(const char *, int, int, int);
|
|
static int set_bell(u_int8_t *, int, int);
|
|
static void usage(void);
|
|
|
|
static unsigned vol_id[5]; /* 4 plus 1 for flag */
|
|
|
|
static int v_flag;
|
|
/*
|
|
* Boot manager installation/configuration utility.
|
|
*/
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
u_int8_t *mbr, *boot0;
|
|
int boot0_size, mbr_size;
|
|
const char *bpath, *fpath;
|
|
char *disk;
|
|
int B_flag, o_flag;
|
|
int d_arg, m_arg, s_arg, t_arg;
|
|
int o_and, o_or, o_e = -1;
|
|
int up, c;
|
|
|
|
bpath = "/boot/boot0";
|
|
fpath = NULL;
|
|
B_flag = v_flag = o_flag = 0;
|
|
d_arg = m_arg = s_arg = t_arg = -1;
|
|
o_and = 0xff;
|
|
o_or = 0;
|
|
while ((c = getopt(argc, argv, "Bvb:d:e:f:i:m:o:s:t:")) != -1)
|
|
switch (c) {
|
|
case 'B':
|
|
B_flag = 1;
|
|
break;
|
|
case 'v':
|
|
v_flag = 1;
|
|
break;
|
|
case 'b':
|
|
bpath = optarg;
|
|
break;
|
|
case 'd':
|
|
d_arg = argtoi(optarg, 0, 0xff, 'd');
|
|
break;
|
|
case 'e':
|
|
if (optarg[0] == '0' && optarg[1] == 'x')
|
|
sscanf(optarg, "0x%02x", &o_e);
|
|
else
|
|
o_e = optarg[0];
|
|
break;
|
|
case 'f':
|
|
fpath = optarg;
|
|
break;
|
|
case 'i':
|
|
if (sscanf(optarg, "%02x%02x-%02x%02x",
|
|
vol_id, vol_id+1, vol_id+2, vol_id+3) == 4)
|
|
vol_id[4] = 1;
|
|
else
|
|
errx(1, "bad argument %s", optarg);
|
|
break;
|
|
case 'm':
|
|
m_arg = argtoi(optarg, 0, 0xf, 'm');
|
|
break;
|
|
case 'o':
|
|
stropt(optarg, &o_and, &o_or);
|
|
o_flag = 1;
|
|
break;
|
|
case 's':
|
|
if (strcasecmp(optarg, "pxe") == 0)
|
|
s_arg = 6;
|
|
else
|
|
s_arg = argtoi(optarg, 1, 6, 's');
|
|
break;
|
|
case 't':
|
|
t_arg = argtoi(optarg, 1, 0xffff, 't');
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
if (argc != 1)
|
|
usage();
|
|
disk = g_device_path(*argv);
|
|
if (disk == NULL)
|
|
errx(1, "Unable to get providername for %s\n", *argv);
|
|
up = B_flag || d_arg != -1 || m_arg != -1 || o_flag || s_arg != -1
|
|
|| t_arg != -1;
|
|
|
|
/* open the disk and read in the existing mbr. Either here or
|
|
* when reading the block from disk, we do check for the version
|
|
* and abort if a suitable block is not found.
|
|
*/
|
|
mbr_size = read_mbr(disk, &mbr, !B_flag);
|
|
|
|
/* save the existing MBR if we are asked to do so */
|
|
if (fpath)
|
|
write_mbr(fpath, O_CREAT | O_TRUNC, mbr, mbr_size);
|
|
|
|
/*
|
|
* If we are installing the boot loader, read it from disk and copy the
|
|
* slice table over from the existing MBR. If not, then point boot0
|
|
* back at the MBR we just read in. After this, boot0 is the data to
|
|
* write back to disk if we are going to do a write.
|
|
*/
|
|
if (B_flag) {
|
|
boot0_size = read_mbr(bpath, &boot0, 1);
|
|
memcpy(boot0 + OFF_PTBL, mbr + OFF_PTBL,
|
|
sizeof(struct dos_partition) * NDOSPART);
|
|
if (b0_ver == 2) /* volume serial number support */
|
|
memcpy(boot0 + OFF_SERIAL, mbr + OFF_SERIAL, 4);
|
|
} else {
|
|
boot0 = mbr;
|
|
boot0_size = mbr_size;
|
|
}
|
|
|
|
/* set the drive */
|
|
if (d_arg != -1)
|
|
boot0[OFF_DRIVE] = d_arg;
|
|
|
|
/* set various flags */
|
|
if (m_arg != -1) {
|
|
boot0[OFF_FLAGS] &= 0xf0;
|
|
boot0[OFF_FLAGS] |= m_arg;
|
|
}
|
|
if (o_flag) {
|
|
boot0[OFF_FLAGS] &= o_and;
|
|
boot0[OFF_FLAGS] |= o_or;
|
|
}
|
|
|
|
/* set the default boot selection */
|
|
if (s_arg != -1)
|
|
boot0[OFF_OPT] = s_arg - 1;
|
|
|
|
/* set the timeout */
|
|
if (t_arg != -1)
|
|
mk2(boot0 + OFF_TICKS, t_arg);
|
|
|
|
/* set the bell char */
|
|
if (o_e != -1 && set_bell(boot0, o_e, 0) != -1)
|
|
up = 1;
|
|
|
|
if (vol_id[4]) {
|
|
if (b0_ver != 2)
|
|
errx(1, "incompatible boot block, cannot set volume ID");
|
|
boot0[OFF_SERIAL] = vol_id[0];
|
|
boot0[OFF_SERIAL+1] = vol_id[1];
|
|
boot0[OFF_SERIAL+2] = vol_id[2];
|
|
boot0[OFF_SERIAL+3] = vol_id[3];
|
|
up = 1; /* force update */
|
|
}
|
|
/* write the MBR back to disk */
|
|
if (up)
|
|
write_mbr(disk, 0, boot0, boot0_size);
|
|
|
|
/* display the MBR */
|
|
if (v_flag)
|
|
display_mbr(boot0);
|
|
|
|
/* clean up */
|
|
if (mbr != boot0)
|
|
free(boot0);
|
|
free(mbr);
|
|
free(disk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* get or set the 'bell' character to be used in case of errors.
|
|
* Lookup for a certain code sequence, return -1 if not found.
|
|
*/
|
|
static int
|
|
set_bell(u_int8_t *mbr, int new_bell, int report)
|
|
{
|
|
/* lookup sequence: 0x100 means skip, 0x200 means done */
|
|
static unsigned seq[] =
|
|
{ 0xb0, 0x100, 0xe8, 0x100, 0x100, 0x30, 0xe4, 0x200 };
|
|
int ofs, i, c;
|
|
for (ofs = 0x60; ofs < 0x180; ofs++) { /* search range */
|
|
if (mbr[ofs] != seq[0]) /* search initial pattern */
|
|
continue;
|
|
for (i=0;; i++) {
|
|
if (seq[i] == 0x200) { /* found */
|
|
c = mbr[ofs+1];
|
|
if (!report)
|
|
mbr[ofs+1] = c = new_bell;
|
|
else
|
|
printf(" bell=%c (0x%x)",
|
|
(c >= ' ' && c < 0x7f) ? c : ' ', c);
|
|
return c;
|
|
}
|
|
if (seq[i] != 0x100 && seq[i] != mbr[ofs+i])
|
|
break;
|
|
}
|
|
}
|
|
warn("bell not found");
|
|
return -1;
|
|
}
|
|
/*
|
|
* Read in the MBR of the disk. If it is boot0, then use the version to
|
|
* read in all of it if necessary. Use pointers to return a malloc'd
|
|
* buffer containing the MBR and then return its size.
|
|
*/
|
|
static int
|
|
read_mbr(const char *disk, u_int8_t **mbr, int check_version)
|
|
{
|
|
u_int8_t buf[MBRSIZE];
|
|
int mbr_size, fd;
|
|
int ver;
|
|
ssize_t n;
|
|
|
|
if ((fd = open(disk, O_RDONLY)) == -1)
|
|
err(1, "open %s", disk);
|
|
if ((n = read(fd, buf, MBRSIZE)) == -1)
|
|
err(1, "read %s", disk);
|
|
if (n != MBRSIZE)
|
|
errx(1, "%s: short read", disk);
|
|
if (cv2(buf + OFF_MAGIC) != 0xaa55)
|
|
errx(1, "%s: bad magic", disk);
|
|
|
|
if (! (ver = boot0bs(buf))) {
|
|
if (check_version)
|
|
errx(1, "%s: unknown or incompatible boot code", disk);
|
|
} else if (boot0version(buf) == 0x101) {
|
|
mbr_size = 1024;
|
|
if ((*mbr = malloc(mbr_size)) == NULL)
|
|
errx(1, "%s: unable to allocate read buffer", disk);
|
|
if (lseek(fd, 0, SEEK_SET) == -1 ||
|
|
(n = read(fd, *mbr, mbr_size)) == -1)
|
|
err(1, "%s", disk);
|
|
if (n != mbr_size)
|
|
errx(1, "%s: short read", disk);
|
|
close(fd);
|
|
return (mbr_size);
|
|
}
|
|
*mbr = malloc(sizeof(buf));
|
|
if (*mbr == NULL)
|
|
errx(1, "%s: unable to allocate MBR buffer", disk);
|
|
memcpy(*mbr, buf, sizeof(buf));
|
|
close(fd);
|
|
|
|
return sizeof(buf);
|
|
}
|
|
|
|
static int
|
|
geom_class_available(const char *name)
|
|
{
|
|
struct gclass *class;
|
|
struct gmesh mesh;
|
|
int error;
|
|
|
|
error = geom_gettree(&mesh);
|
|
if (error != 0)
|
|
errc(1, error, "Cannot get GEOM tree");
|
|
|
|
LIST_FOREACH(class, &mesh.lg_class, lg_class) {
|
|
if (strcmp(class->lg_name, name) == 0) {
|
|
geom_deletetree(&mesh);
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
geom_deletetree(&mesh);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Write out the mbr to the specified file.
|
|
*/
|
|
static void
|
|
write_mbr(const char *fname, int flags, u_int8_t *mbr, int mbr_size)
|
|
{
|
|
struct gctl_req *grq;
|
|
const char *errmsg;
|
|
char *pname;
|
|
ssize_t n;
|
|
int fd;
|
|
|
|
fd = open(fname, O_WRONLY | flags, 0666);
|
|
if (fd != -1) {
|
|
n = write(fd, mbr, mbr_size);
|
|
close(fd);
|
|
if (n != mbr_size)
|
|
errx(1, "%s: short write", fname);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If we're called to write to a backup file, don't try to
|
|
* write through GEOM.
|
|
*/
|
|
if (flags != 0)
|
|
err(1, "can't open file %s to write backup", fname);
|
|
|
|
/* Try open it read only. */
|
|
fd = open(fname, O_RDONLY);
|
|
if (fd == -1) {
|
|
warn("error opening %s", fname);
|
|
return;
|
|
}
|
|
|
|
pname = g_providername(fd);
|
|
if (pname == NULL) {
|
|
warn("error getting providername for %s", fname);
|
|
return;
|
|
}
|
|
|
|
/* First check that GEOM_PART is available */
|
|
if (geom_class_available("PART") != 0) {
|
|
grq = gctl_get_handle();
|
|
gctl_ro_param(grq, "class", -1, "PART");
|
|
gctl_ro_param(grq, "arg0", -1, pname);
|
|
gctl_ro_param(grq, "verb", -1, "bootcode");
|
|
gctl_ro_param(grq, "bootcode", mbr_size, mbr);
|
|
gctl_ro_param(grq, "flags", -1, "C");
|
|
errmsg = gctl_issue(grq);
|
|
if (errmsg != NULL && errmsg[0] != '\0')
|
|
errx(1, "GEOM_PART: write bootcode to %s failed: %s",
|
|
fname, errmsg);
|
|
gctl_free(grq);
|
|
} else if (geom_class_available("MBR") != 0) {
|
|
grq = gctl_get_handle();
|
|
gctl_ro_param(grq, "verb", -1, "write MBR");
|
|
gctl_ro_param(grq, "class", -1, "MBR");
|
|
gctl_ro_param(grq, "geom", -1, pname);
|
|
gctl_ro_param(grq, "data", mbr_size, mbr);
|
|
errmsg = gctl_issue(grq);
|
|
if (errmsg != NULL)
|
|
err(1, "GEOM_MBR: write MBR to %s failed", fname);
|
|
gctl_free(grq);
|
|
} else
|
|
errx(1, "can't write MBR to %s", fname);
|
|
free(pname);
|
|
}
|
|
|
|
/*
|
|
* Outputs an informative dump of the data in the MBR to stdout.
|
|
*/
|
|
static void
|
|
display_mbr(u_int8_t *mbr)
|
|
{
|
|
struct dos_partition *part;
|
|
int i, version;
|
|
|
|
part = (struct dos_partition *)(mbr + DOSPARTOFF);
|
|
printf(fmt0);
|
|
for (i = 0; i < NDOSPART; i++)
|
|
if (part[i].dp_typ)
|
|
printf(fmt1, 1 + i, part[i].dp_flag,
|
|
part[i].dp_scyl + ((part[i].dp_ssect & 0xc0) << 2),
|
|
part[i].dp_shd, part[i].dp_ssect & 0x3f, part[i].dp_typ,
|
|
part[i].dp_ecyl + ((part[i].dp_esect & 0xc0) << 2),
|
|
part[i].dp_ehd, part[i].dp_esect & 0x3f, part[i].dp_start,
|
|
part[i].dp_size);
|
|
printf("\n");
|
|
version = boot0version(mbr);
|
|
printf("version=%d.%d drive=0x%x mask=0x%x ticks=%u",
|
|
version >> 8, version & 0xff, mbr[OFF_DRIVE],
|
|
mbr[OFF_FLAGS] & 0xf, cv2(mbr + OFF_TICKS));
|
|
set_bell(mbr, 0, 1);
|
|
printf("\noptions=");
|
|
for (i = 0; i < nopt; i++) {
|
|
if (i)
|
|
printf(",");
|
|
if (!(mbr[OFF_FLAGS] & 1 << (7 - i)) ^ opttbl[i].def)
|
|
printf("no");
|
|
printf("%s", opttbl[i].tok);
|
|
}
|
|
printf("\n");
|
|
if (b0_ver == 2)
|
|
printf("volume serial ID %02x%02x-%02x%02x\n",
|
|
mbr[OFF_SERIAL], mbr[OFF_SERIAL+1],
|
|
mbr[OFF_SERIAL+2], mbr[OFF_SERIAL+3]);
|
|
printf("default_selection=F%d (", mbr[OFF_OPT] + 1);
|
|
if (mbr[OFF_OPT] < 4)
|
|
printf("Slice %d", mbr[OFF_OPT] + 1);
|
|
else if (mbr[OFF_OPT] == 4)
|
|
printf("Drive 1");
|
|
else
|
|
printf("PXE");
|
|
printf(")\n");
|
|
}
|
|
|
|
/*
|
|
* Return the boot0 version with the minor revision in the low byte, and
|
|
* the major revision in the next higher byte.
|
|
*/
|
|
static int
|
|
boot0version(const u_int8_t *bs)
|
|
{
|
|
/* Check for old version, and return 0x100 if found. */
|
|
int v = boot0bs(bs);
|
|
if (v != 0)
|
|
return v << 8;
|
|
|
|
/* We have a newer boot0, so extract the version number and return it. */
|
|
return *(const int *)(bs + OFF_VERSION) & 0xffff;
|
|
}
|
|
|
|
/* descriptor of a pattern to match.
|
|
* Start from the first entry trying to match the chunk of bytes,
|
|
* if you hit an entry with len=0 terminate the search and report
|
|
* off as the version. Otherwise skip to the next block after len=0
|
|
* An entry with len=0, off=0 is the end marker.
|
|
*/
|
|
struct byte_pattern {
|
|
unsigned off;
|
|
unsigned len;
|
|
u_int8_t *key;
|
|
};
|
|
|
|
/*
|
|
* Decide if we have valid boot0 boot code by looking for
|
|
* characteristic byte sequences at fixed offsets.
|
|
*/
|
|
static int
|
|
boot0bs(const u_int8_t *bs)
|
|
{
|
|
/* the initial code sequence */
|
|
static u_int8_t id0[] = {0xfc, 0x31, 0xc0, 0x8e, 0xc0, 0x8e, 0xd8,
|
|
0x8e, 0xd0, 0xbc, 0x00, 0x7c };
|
|
/* the drive id */
|
|
static u_int8_t id1[] = {'D', 'r', 'i', 'v', 'e', ' '};
|
|
static struct byte_pattern patterns[] = {
|
|
{0x0, sizeof(id0), id0},
|
|
{0x1b2, sizeof(id1), id1},
|
|
{1, 0, NULL},
|
|
{0x0, sizeof(id0), id0}, /* version with NT support */
|
|
{0x1ae, sizeof(id1), id1},
|
|
{2, 0, NULL},
|
|
{0, 0, NULL},
|
|
};
|
|
struct byte_pattern *p = patterns;
|
|
|
|
for (; p->off || p->len; p++) {
|
|
if (p->len == 0)
|
|
break;
|
|
if (!memcmp(bs + p->off, p->key, p->len)) /* match */
|
|
continue;
|
|
while (p->len) /* skip to next block */
|
|
p++;
|
|
}
|
|
b0_ver = p->off; /* XXX ugly side effect */
|
|
return p->off;
|
|
}
|
|
|
|
/*
|
|
* Adjust "and" and "or" masks for a -o option argument.
|
|
*/
|
|
static void
|
|
stropt(const char *arg, int *xa, int *xo)
|
|
{
|
|
const char *q;
|
|
char *s, *s1;
|
|
int inv, i, x;
|
|
|
|
if (!(s = strdup(arg)))
|
|
err(1, NULL);
|
|
for (s1 = s; (q = strtok(s1, ",")); s1 = NULL) {
|
|
if ((inv = !strncmp(q, "no", 2)))
|
|
q += 2;
|
|
for (i = 0; i < nopt; i++)
|
|
if (!strcmp(q, opttbl[i].tok))
|
|
break;
|
|
if (i == nopt)
|
|
errx(1, "%s: Unknown -o option", q);
|
|
if (opttbl[i].def)
|
|
inv ^= 1;
|
|
x = 1 << (7 - i);
|
|
if (inv)
|
|
*xa &= ~x;
|
|
else
|
|
*xo |= x;
|
|
}
|
|
free(s);
|
|
}
|
|
|
|
/*
|
|
* Convert and check an option argument.
|
|
*/
|
|
static int
|
|
argtoi(const char *arg, int lo, int hi, int opt)
|
|
{
|
|
char *s;
|
|
long x;
|
|
|
|
errno = 0;
|
|
x = strtol(arg, &s, 0);
|
|
if (errno || !*arg || *s || x < lo || x > hi)
|
|
errx(1, "%s: Bad argument to -%c option", arg, opt);
|
|
return x;
|
|
}
|
|
|
|
/*
|
|
* Display usage information.
|
|
*/
|
|
static void
|
|
usage(void)
|
|
{
|
|
fprintf(stderr, "%s\n%s\n",
|
|
"usage: boot0cfg [-Bv] [-b boot0] [-d drive] [-f file] [-m mask]",
|
|
" [-o options] [-s slice] [-t ticks] disk");
|
|
exit(1);
|
|
}
|