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/* $Id: read_bios.c,v 1.6 2009-01-28 17:20:10 potyra Exp $
*
* Copyright (C) 2004-2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
#include <features.h>
#define __USE_FILE_OFFSET64
#define __USE_LARGEFILE64
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
char *progname;
unsigned long addr = 0xf0000;
unsigned long size = 0x10000;
static __attribute__((__noreturn__)) void
usage(int retval)
{
fprintf(stderr, "Usage: %s [-a addr] [-s size]\n", progname);
exit(retval);
}
int
main(int argc, char **argv)
{
int c;
unsigned char bios[0x100000];
int fd;
int ret;
/*
* Get program name.
*/
progname = *argv;
/*
* Get options.
*/
while ((c = getopt(argc, argv, "a:s:")) != -1) {
switch (c) {
case 'a':
addr = strtoul(optarg, (char **) 0, 0);
break;
case 's':
size = strtoul(optarg, (char **) 0, 0);
break;
default:
usage(1);
}
}
argc -= optind;
argv += optind;
/*
* Check parameter.
*/
if (argc != 0) {
usage(1);
}
if (sizeof(bios) < size) {
fprintf(stderr, "Size too large (maximum: 0x%lx)!\n",
(unsigned long) sizeof(bios));
exit(1);
}
/*
* Do work.
*/
fd = open("/dev/mem", O_RDONLY | O_LARGEFILE);
if (fd < 0) {
fprintf(stderr, "%s: %s: open: %s.\n", progname, "/dev/mem",
strerror(errno));
exit(1);
}
ret = lseek(fd, addr, SEEK_SET);
if (ret == -1) {
fprintf(stderr, "%s: %s: lseek: %s.\n", progname, "/dev/mem",
strerror(errno));
exit(1);
}
if (ret != addr) {
fprintf(stderr, "%s: %s: lseek: %s.\n", progname, "/dev/mem",
"Bad seek");
exit(1);
}
ret = read(fd, bios, size);
if (ret < 0) {
fprintf(stderr, "%s: %s: read: %s.\n", progname, "/dev/mem",
strerror(errno));
exit(1);
}
if (ret < size) {
fprintf(stderr, "%s: %s: read: %s.\n", progname, "/dev/mem",
"Short read");
exit(1);
}
ret = close(fd);
if (ret < 0) {
fprintf(stderr, "%s: %s: close: %s.\n", progname, "/dev/mem",
strerror(errno));
exit(1);
}
ret = write(1, bios, size);
if (ret < 0) {
fprintf(stderr, "%s: %s: write: %s.\n", progname, "<stdout>",
strerror(errno));
exit(1);
}
if (ret < size) {
fprintf(stderr, "%s: %s: write: %s.\n", progname, "<stdout>",
"Short write");
exit(1);
}
return 0;
}
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