ee6fb785cd
(with care) in those instances where boot0 is not passed the correct drive number by the PC BIOS. (The symptoms are a "F5 Drive 0" line, even though the current drive is drive 0.)
271 lines
7.8 KiB
C
271 lines
7.8 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] =
|
|
"$Id: boot0cfg.c,v 1.2 1999/02/22 09:36:54 rnordier Exp $";
|
|
#endif /* not lint */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/disklabel.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.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_DRIVE 0x1ba /* offset: setdrv drive */
|
|
#define OFF_FLAGS 0x1bb /* offset: option flags */
|
|
#define OFF_TICKS 0x1bc /* offset: clock ticks */
|
|
#define OFF_PTBL 0x1be /* offset: partition table */
|
|
#define OFF_MAGIC 0x1fe /* offset: magic number */
|
|
|
|
#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 void stropt(const char *, int *, int *);
|
|
static char *mkrdev(const char *);
|
|
static int argtoi(const char *, int, int, int);
|
|
static void usage(void);
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
u_int8_t buf[MBRSIZE];
|
|
struct dos_partition part[4];
|
|
const char *bpath, *fpath, *disk;
|
|
ssize_t n;
|
|
int B_flag, v_flag, o_flag;
|
|
int d_arg, t_arg;
|
|
int o_and, o_or;
|
|
int fd, fd1, up, c, i;
|
|
|
|
bpath = "/boot/boot0";
|
|
fpath = NULL;
|
|
B_flag = v_flag = o_flag = 0;
|
|
d_arg = t_arg = -1;
|
|
o_and = 0xff;
|
|
o_or = 0;
|
|
while ((c = getopt(argc, argv, "Bvb:d:f:o: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 'f':
|
|
fpath = optarg;
|
|
break;
|
|
case 'o':
|
|
stropt(optarg, &o_and, &o_or);
|
|
o_flag = 1;
|
|
break;
|
|
case 't':
|
|
t_arg = argtoi(optarg, 1, 0xffff, 't');
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
if (argc != 1)
|
|
usage();
|
|
disk = mkrdev(*argv);
|
|
up = B_flag || d_arg != -1 || o_flag || t_arg != -1;
|
|
if ((fd = open(disk, up ? O_RDWR : O_RDONLY)) == -1)
|
|
err(1, "%s", disk);
|
|
if ((n = read(fd, buf, MBRSIZE)) == -1)
|
|
err(1, "%s", disk);
|
|
if (n != MBRSIZE)
|
|
errx(1, "%s: short read", disk);
|
|
if (cv2(buf + OFF_MAGIC) != 0xaa55)
|
|
errx(1, "%s: bad magic", disk);
|
|
if (fpath) {
|
|
if ((fd1 = open(fpath, O_WRONLY | O_CREAT | O_TRUNC,
|
|
0666)) == -1 ||
|
|
(n = write(fd1, buf, MBRSIZE)) == -1 || close(fd1))
|
|
err(1, "%s", fpath);
|
|
if (n != MBRSIZE)
|
|
errx(1, "%s: short write", fpath);
|
|
}
|
|
memcpy(part, buf + OFF_PTBL, sizeof(part));
|
|
if (B_flag) {
|
|
if ((fd1 = open(bpath, O_RDONLY)) == -1 ||
|
|
(n = read(fd1, buf, MBRSIZE)) == -1 || close(fd1))
|
|
err(1, "%s", bpath);
|
|
if (n != MBRSIZE)
|
|
errx(1, "%s: short read", bpath);
|
|
if (cv2(buf + OFF_MAGIC) != 0xaa55)
|
|
errx(1, "%s: bad magic", bpath);
|
|
memcpy(buf + OFF_PTBL, part, sizeof(part));
|
|
}
|
|
if (d_arg != -1)
|
|
buf[OFF_DRIVE] = d_arg;
|
|
if (o_flag) {
|
|
buf[OFF_FLAGS] &= o_and;
|
|
buf[OFF_FLAGS] |= o_or;
|
|
}
|
|
if (t_arg != -1)
|
|
mk2(buf + OFF_TICKS, t_arg);
|
|
if (up) {
|
|
if (lseek(fd, 0, SEEK_SET) == -1 ||
|
|
(n = write(fd, buf, MBRSIZE)) == -1 || close(fd))
|
|
err(1, "%s", disk);
|
|
if (n != MBRSIZE)
|
|
errx(1, "%s: short write", disk);
|
|
}
|
|
if (v_flag) {
|
|
printf(fmt0);
|
|
for (i = 0; i < 4; 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");
|
|
printf("drive=0x%x options=", buf[OFF_DRIVE]);
|
|
for (i = 0; i < nopt; i++) {
|
|
if (i)
|
|
printf(",");
|
|
if (!(buf[OFF_FLAGS] & 1 << (7 - i)) ^ opttbl[i].def)
|
|
printf("no");
|
|
printf("%s", opttbl[i].tok);
|
|
}
|
|
printf(" ticks=%u\n", cv2(buf + OFF_TICKS));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static char *
|
|
mkrdev(const char *fname)
|
|
{
|
|
char buf[MAXPATHLEN];
|
|
struct stat sb;
|
|
char *s;
|
|
|
|
s = (char *) fname;
|
|
if (!strchr(fname, '/')) {
|
|
snprintf(buf, sizeof(buf), "%sr%s", _PATH_DEV, fname);
|
|
if (stat(buf, &sb))
|
|
snprintf(buf, sizeof(buf), "%s%s", _PATH_DEV, fname);
|
|
if (!(s = strdup(buf)))
|
|
err(1, NULL);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
fprintf(stderr, "%s\n%s\n",
|
|
"usage: boot0cfg [-Bv] [-b boot0] [-d drive] [-f file] [-o options]",
|
|
" [-t ticks] disk");
|
|
exit(1);
|
|
}
|