354 lines
8.4 KiB
C
354 lines
8.4 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Loading modules, booting the system
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*/
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#include <stand.h>
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#include <string.h>
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#include "bootstrap.h"
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static char *getbootfile(int try);
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static int loadakernel(int try, int argc, char* argv[]);
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/* List of kernel names to try (may be overwritten by boot.config) XXX should move from here? */
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static const char *default_bootfiles = "kernel";
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static int autoboot_tried;
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/*
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* The user wants us to boot.
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*/
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COMMAND_SET(boot, "boot", "boot a file or loaded kernel", command_boot);
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static int
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command_boot(int argc, char *argv[])
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{
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struct preloaded_file *fp;
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/*
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* See if the user has specified an explicit kernel to boot.
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*/
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if ((argc > 1) && (argv[1][0] != '-')) {
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/* XXX maybe we should discard everything and start again? */
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if (file_findfile(NULL, NULL) != NULL) {
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sprintf(command_errbuf, "can't boot '%s', kernel module already loaded", argv[1]);
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return(CMD_ERROR);
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}
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/* find/load the kernel module */
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if (mod_load(argv[1], argc - 2, argv + 2) != 0)
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return(CMD_ERROR);
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/* we have consumed all arguments */
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argc = 1;
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}
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/*
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* See if there is a kernel module already loaded
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*/
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if (file_findfile(NULL, NULL) == NULL)
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if (loadakernel(0, argc - 1, argv + 1))
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/* we have consumed all arguments */
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argc = 1;
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/*
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* Loaded anything yet?
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*/
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if ((fp = file_findfile(NULL, NULL)) == NULL) {
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command_errmsg = "no bootable kernel";
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return(CMD_ERROR);
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}
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/*
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* If we were given arguments, discard any previous.
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* XXX should we merge arguments? Hard to DWIM.
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*/
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if (argc > 1) {
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if (fp->f_args != NULL)
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free(fp->f_args);
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fp->f_args = unargv(argc - 1, argv + 1);
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}
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/* Hook for platform-specific autoloading of modules */
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if (archsw.arch_autoload() != 0)
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return(CMD_ERROR);
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/* Call the exec handler from the loader matching the kernel */
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file_formats[fp->f_loader]->l_exec(fp);
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return(CMD_ERROR);
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}
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/*
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* Autoboot after a delay
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*/
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COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay", command_autoboot);
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static int
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command_autoboot(int argc, char *argv[])
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{
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int howlong;
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char *cp, *prompt;
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prompt = NULL;
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howlong = -1;
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switch(argc) {
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case 3:
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prompt = argv[2];
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/* FALLTHROUGH */
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case 2:
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howlong = strtol(argv[1], &cp, 0);
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if (*cp != 0) {
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sprintf(command_errbuf, "bad delay '%s'", argv[1]);
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return(CMD_ERROR);
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}
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/* FALLTHROUGH */
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case 1:
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return(autoboot(howlong, prompt));
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}
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command_errmsg = "too many arguments";
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return(CMD_ERROR);
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}
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/*
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* Called before we go interactive. If we think we can autoboot, and
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* we haven't tried already, try now.
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*/
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void
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autoboot_maybe()
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{
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char *cp;
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cp = getenv("autoboot_delay");
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if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO")))
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autoboot(-1, NULL); /* try to boot automatically */
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}
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int
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autoboot(int timeout, char *prompt)
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{
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time_t when, otime, ntime;
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int c, yes;
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char *argv[2], *cp, *ep;
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char *kernelname;
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autoboot_tried = 1;
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if (timeout == -1) {
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/* try to get a delay from the environment */
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if ((cp = getenv("autoboot_delay"))) {
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timeout = strtol(cp, &ep, 0);
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if (cp == ep)
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timeout = -1;
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}
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}
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if (timeout == -1) /* all else fails */
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timeout = 10;
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kernelname = getenv("kernelname");
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if (kernelname == NULL) {
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argv[0] = NULL;
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loadakernel(0, 0, argv);
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kernelname = getenv("kernelname");
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if (kernelname == NULL) {
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command_errmsg = "no valid kernel found";
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return(CMD_ERROR);
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}
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}
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otime = time(NULL);
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when = otime + timeout; /* when to boot */
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yes = 0;
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printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt);
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for (;;) {
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if (ischar()) {
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c = getchar();
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if ((c == '\r') || (c == '\n'))
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yes = 1;
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break;
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}
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ntime = time(NULL);
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if (ntime >= when) {
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yes = 1;
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break;
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}
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if (ntime != otime) {
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printf("\rBooting [%s] in %d second%s... ",
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kernelname, (int)(when - ntime),
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(when-ntime)==1?"":"s");
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otime = ntime;
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}
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}
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if (yes)
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printf("\rBooting [%s]... ", kernelname);
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putchar('\n');
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if (yes) {
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argv[0] = "boot";
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argv[1] = NULL;
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return(command_boot(1, argv));
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}
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return(CMD_OK);
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}
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/*
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* Scrounge for the name of the (try)'th file we will try to boot.
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*/
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static char *
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getbootfile(int try)
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{
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static char *name = NULL;
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const char *spec, *ep;
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size_t len;
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/* we use dynamic storage */
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if (name != NULL) {
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free(name);
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name = NULL;
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}
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/*
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* Try $bootfile, then try our builtin default
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*/
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if ((spec = getenv("bootfile")) == NULL)
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spec = default_bootfiles;
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while ((try > 0) && (spec != NULL)) {
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spec = strchr(spec, ';');
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if (spec)
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spec++; /* skip over the leading ';' */
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try--;
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}
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if (spec != NULL) {
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if ((ep = strchr(spec, ';')) != NULL) {
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len = ep - spec;
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} else {
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len = strlen(spec);
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}
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name = malloc(len + 1);
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strncpy(name, spec, len);
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name[len] = 0;
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}
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if (name && name[0] == 0) {
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free(name);
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name = NULL;
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}
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return(name);
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}
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/*
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* Try to find the /etc/fstab file on the filesystem (rootdev),
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* which should be be the root filesystem, and parse it to find
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* out what the kernel ought to think the root filesystem is.
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*
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* If we're successful, set vfs.root.mountfrom to <vfstype>:<path>
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* so that the kernel can tell both which VFS and which node to use
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* to mount the device. If this variable's already set, don't
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* overwrite it.
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*/
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int
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getrootmount(char *rootdev)
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{
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char lbuf[128], *cp, *ep, *dev, *fstyp;
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int fd, error;
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if (getenv("vfs.root.mountfrom") != NULL)
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return(0);
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sprintf(lbuf, "%s/etc/fstab", rootdev);
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if ((fd = open(lbuf, O_RDONLY)) < 0)
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return(1);
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/* loop reading lines from /etc/fstab What was that about sscanf again? */
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error = 1;
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while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) {
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if ((lbuf[0] == 0) || (lbuf[0] == '#'))
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continue;
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/* skip device name */
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for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++)
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;
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if (*cp == 0) /* misformatted */
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continue;
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/* delimit and save */
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*cp++ = 0;
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dev = strdup(lbuf);
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/* skip whitespace up to mountpoint */
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while ((*cp != 0) && isspace(*cp))
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cp++;
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/* must have /<space> to be root */
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if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1)))
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continue;
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/* skip whitespace up to fstype */
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cp += 2;
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while ((*cp != 0) && isspace(*cp))
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cp++;
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if (*cp == 0) /* misformatted */
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continue;
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/* skip text to end of fstype and delimit */
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ep = cp;
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while ((*cp != 0) && !isspace(*cp))
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cp++;
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*cp = 0;
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fstyp = strdup(ep);
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/* build the final result and save it */
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sprintf(lbuf, "%s:%s", fstyp, dev);
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free(dev);
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free(fstyp);
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setenv("vfs.root.mountfrom", lbuf, 0);
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error = 0;
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break;
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}
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close(fd);
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return(error);
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}
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static int
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loadakernel(int try, int argc, char* argv[])
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{
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char *cp;
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for (try = 0; (cp = getbootfile(try)) != NULL; try++)
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if (mod_load(cp, argc - 1, argv + 1) != 0)
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printf("can't load '%s'\n", cp);
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else
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return 1;
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return 0;
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}
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