FreeBSD-5.3/sys/boot/common/boot.c
/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* 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: src/sys/boot/common/boot.c,v 1.29 2003/08/25 23:30:41 obrien Exp $");
/*
* Loading modules, booting the system
*/
#include <stand.h>
#include <string.h>
#include "bootstrap.h"
static char *getbootfile(int try);
static int loadakernel(int try, int argc, char* argv[]);
/* List of kernel names to try (may be overwritten by boot.config) XXX should move from here? */
static const char *default_bootfiles = "kernel";
static int autoboot_tried;
/*
* The user wants us to boot.
*/
COMMAND_SET(boot, "boot", "boot a file or loaded kernel", command_boot);
static int
command_boot(int argc, char *argv[])
{
struct preloaded_file *fp;
/*
* See if the user has specified an explicit kernel to boot.
*/
if ((argc > 1) && (argv[1][0] != '-')) {
/* XXX maybe we should discard everything and start again? */
if (file_findfile(NULL, NULL) != NULL) {
sprintf(command_errbuf, "can't boot '%s', kernel module already loaded", argv[1]);
return(CMD_ERROR);
}
/* find/load the kernel module */
if (mod_loadkld(argv[1], argc - 2, argv + 2) != 0)
return(CMD_ERROR);
/* we have consumed all arguments */
argc = 1;
}
/*
* See if there is a kernel module already loaded
*/
if (file_findfile(NULL, NULL) == NULL)
if (loadakernel(0, argc - 1, argv + 1))
/* we have consumed all arguments */
argc = 1;
/*
* Loaded anything yet?
*/
if ((fp = file_findfile(NULL, NULL)) == NULL) {
command_errmsg = "no bootable kernel";
return(CMD_ERROR);
}
/*
* If we were given arguments, discard any previous.
* XXX should we merge arguments? Hard to DWIM.
*/
if (argc > 1) {
if (fp->f_args != NULL)
free(fp->f_args);
fp->f_args = unargv(argc - 1, argv + 1);
}
/* Hook for platform-specific autoloading of modules */
if (archsw.arch_autoload() != 0)
return(CMD_ERROR);
/* Call the exec handler from the loader matching the kernel */
file_formats[fp->f_loader]->l_exec(fp);
return(CMD_ERROR);
}
/*
* Autoboot after a delay
*/
COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay", command_autoboot);
static int
command_autoboot(int argc, char *argv[])
{
int howlong;
char *cp, *prompt;
prompt = NULL;
howlong = -1;
switch(argc) {
case 3:
prompt = argv[2];
/* FALLTHROUGH */
case 2:
howlong = strtol(argv[1], &cp, 0);
if (*cp != 0) {
sprintf(command_errbuf, "bad delay '%s'", argv[1]);
return(CMD_ERROR);
}
/* FALLTHROUGH */
case 1:
return(autoboot(howlong, prompt));
}
command_errmsg = "too many arguments";
return(CMD_ERROR);
}
/*
* Called before we go interactive. If we think we can autoboot, and
* we haven't tried already, try now.
*/
void
autoboot_maybe()
{
char *cp;
cp = getenv("autoboot_delay");
if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO")))
autoboot(-1, NULL); /* try to boot automatically */
}
int
autoboot(int timeout, char *prompt)
{
time_t when, otime, ntime;
int c, yes;
char *argv[2], *cp, *ep;
char *kernelname;
autoboot_tried = 1;
if (timeout == -1) {
/* try to get a delay from the environment */
if ((cp = getenv("autoboot_delay"))) {
timeout = strtol(cp, &ep, 0);
if (cp == ep)
timeout = -1;
}
}
if (timeout == -1) /* all else fails */
timeout = 10;
kernelname = getenv("kernelname");
if (kernelname == NULL) {
argv[0] = NULL;
loadakernel(0, 0, argv);
kernelname = getenv("kernelname");
if (kernelname == NULL) {
command_errmsg = "no valid kernel found";
return(CMD_ERROR);
}
}
otime = time(NULL);
when = otime + timeout; /* when to boot */
yes = 0;
printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt);
for (;;) {
if (ischar()) {
c = getchar();
if ((c == '\r') || (c == '\n'))
yes = 1;
break;
}
ntime = time(NULL);
if (ntime >= when) {
yes = 1;
break;
}
if (ntime != otime) {
printf("\rBooting [%s] in %d second%s... ",
kernelname, (int)(when - ntime),
(when-ntime)==1?"":"s");
otime = ntime;
}
}
if (yes)
printf("\rBooting [%s]... ", kernelname);
putchar('\n');
if (yes) {
argv[0] = "boot";
argv[1] = NULL;
return(command_boot(1, argv));
}
return(CMD_OK);
}
/*
* Scrounge for the name of the (try)'th file we will try to boot.
*/
static char *
getbootfile(int try)
{
static char *name = NULL;
const char *spec, *ep;
size_t len;
/* we use dynamic storage */
if (name != NULL) {
free(name);
name = NULL;
}
/*
* Try $bootfile, then try our builtin default
*/
if ((spec = getenv("bootfile")) == NULL)
spec = default_bootfiles;
while ((try > 0) && (spec != NULL)) {
spec = strchr(spec, ';');
if (spec)
spec++; /* skip over the leading ';' */
try--;
}
if (spec != NULL) {
if ((ep = strchr(spec, ';')) != NULL) {
len = ep - spec;
} else {
len = strlen(spec);
}
name = malloc(len + 1);
strncpy(name, spec, len);
name[len] = 0;
}
if (name && name[0] == 0) {
free(name);
name = NULL;
}
return(name);
}
/*
* Try to find the /etc/fstab file on the filesystem (rootdev),
* which should be be the root filesystem, and parse it to find
* out what the kernel ought to think the root filesystem is.
*
* If we're successful, set vfs.root.mountfrom to <vfstype>:<path>
* so that the kernel can tell both which VFS and which node to use
* to mount the device. If this variable's already set, don't
* overwrite it.
*/
int
getrootmount(char *rootdev)
{
char lbuf[128], *cp, *ep, *dev, *fstyp;
int fd, error;
if (getenv("vfs.root.mountfrom") != NULL)
return(0);
sprintf(lbuf, "%s/etc/fstab", rootdev);
if ((fd = open(lbuf, O_RDONLY)) < 0)
return(1);
/* loop reading lines from /etc/fstab What was that about sscanf again? */
error = 1;
while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) {
if ((lbuf[0] == 0) || (lbuf[0] == '#'))
continue;
/* skip device name */
for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++)
;
if (*cp == 0) /* misformatted */
continue;
/* delimit and save */
*cp++ = 0;
dev = strdup(lbuf);
/* skip whitespace up to mountpoint */
while ((*cp != 0) && isspace(*cp))
cp++;
/* must have /<space> to be root */
if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1)))
continue;
/* skip whitespace up to fstype */
cp += 2;
while ((*cp != 0) && isspace(*cp))
cp++;
if (*cp == 0) /* misformatted */
continue;
/* skip text to end of fstype and delimit */
ep = cp;
while ((*cp != 0) && !isspace(*cp))
cp++;
*cp = 0;
fstyp = strdup(ep);
/* build the final result and save it */
sprintf(lbuf, "%s:%s", fstyp, dev);
free(dev);
free(fstyp);
setenv("vfs.root.mountfrom", lbuf, 0);
error = 0;
break;
}
close(fd);
return(error);
}
static int
loadakernel(int try, int argc, char* argv[])
{
char *cp;
for (try = 0; (cp = getbootfile(try)) != NULL; try++)
if (mod_loadkld(cp, argc - 1, argv + 1) != 0)
printf("can't load '%s'\n", cp);
else
return 1;
return 0;
}