2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/boot/common/boot.c,v 1.15.2.5 2000/12/28 13:12:33 ps Exp $
27 * $DragonFly: src/sys/boot/common/boot.c,v 1.2 2003/06/17 04:28:16 dillon Exp $
31 * Loading modules, booting the system
37 #include "bootstrap.h"
39 static char *getbootfile(int try);
41 /* List of kernel names to try (may be overwritten by boot.config) XXX should move from here? */
42 static const char *default_bootfiles = "kernel;kernel.old";
44 static int autoboot_tried;
47 * The user wants us to boot.
49 COMMAND_SET(boot, "boot", "boot a file or loaded kernel", command_boot);
52 command_boot(int argc, char *argv[])
54 struct loaded_module *km;
59 * See if the user has specified an explicit kernel to boot.
61 if ((argc > 1) && (argv[1][0] != '-')) {
63 /* XXX maybe we should discard everything and start again? */
64 if (mod_findmodule(NULL, NULL) != NULL) {
65 sprintf(command_errbuf, "can't boot '%s', kernel module already loaded", argv[1]);
69 /* find/load the kernel module */
70 if (mod_load(argv[1], argc - 2, argv + 2) != 0)
72 /* we have consumed all arguments */
77 * See if there is a kernel module already loaded
79 if (mod_findmodule(NULL, NULL) == NULL) {
80 for (try = 0; (cp = getbootfile(try)) != NULL; try++) {
81 if (mod_load(cp, argc - 1, argv + 1) != 0) {
82 printf("can't load '%s'\n", cp);
84 /* we have consumed all arguments */
92 * Loaded anything yet?
94 if ((km = mod_findmodule(NULL, NULL)) == NULL) {
95 command_errmsg = "no bootable kernel";
100 * If we were given arguments, discard any previous.
101 * XXX should we merge arguments? Hard to DWIM.
104 if (km->m_args != NULL)
106 km->m_args = unargv(argc - 1, argv + 1);
109 /* Hook for platform-specific autoloading of modules */
110 if (archsw.arch_autoload() != 0)
113 /* Call the exec handler from the loader matching the kernel */
114 module_formats[km->m_loader]->l_exec(km);
120 * Autoboot after a delay
123 COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay", command_autoboot);
126 command_autoboot(int argc, char *argv[])
138 howlong = strtol(argv[1], &cp, 0);
140 sprintf(command_errbuf, "bad delay '%s'", argv[1]);
145 return(autoboot(howlong, prompt));
148 command_errmsg = "too many arguments";
153 * Called before we go interactive. If we think we can autoboot, and
154 * we haven't tried already, try now.
161 cp = getenv("autoboot_delay");
162 if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO")))
163 autoboot(-1, NULL); /* try to boot automatically */
167 autoboot(int timeout, char *prompt)
169 time_t when, otime, ntime;
171 char *argv[2], *cp, *ep;
176 /* try to get a delay from the environment */
177 if ((cp = getenv("autoboot_delay"))) {
178 timeout = strtol(cp, &ep, 0);
183 if (timeout == -1) /* all else fails */
187 when = otime + timeout; /* when to boot */
190 /* XXX could try to work out what we might boot */
191 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt);
196 if ((c == '\r') || (c == '\n'))
205 if (ntime != otime) {
206 printf("\rBooting [%s] in %d second%s... ",
207 getbootfile(0), (int)(when - ntime),
208 (when-ntime)==1?"":"s");
213 printf("\rBooting [%s]... ", getbootfile(0));
218 return(command_boot(1, argv));
224 * Scrounge for the name of the (try)'th file we will try to boot.
229 static char *name = NULL;
233 /* we use dynamic storage */
240 * Try $bootfile, then try our builtin default
242 if ((spec = getenv("bootfile")) == NULL)
243 spec = default_bootfiles;
245 while ((try > 0) && (spec != NULL)) {
246 spec = strchr(spec, ';');
248 spec++; /* skip over the leading ';' */
252 if ((ep = strchr(spec, ';')) != NULL) {
257 name = malloc(len + 1);
258 strncpy(name, spec, len);
261 if (name && name[0] == 0) {
269 * Try to find the /etc/fstab file on the filesystem (rootdev),
270 * which should be be the root filesystem, and parse it to find
271 * out what the kernel ought to think the root filesystem is.
273 * If we're successful, set vfs.root.mountfrom to <vfstype>:<path>
274 * so that the kernel can tell both which VFS and which node to use
275 * to mount the device. If this variable's already set, don't
279 getrootmount(char *rootdev)
281 char lbuf[128], *cp, *ep, *dev, *fstyp;
284 if (getenv("vfs.root.mountfrom") != NULL)
287 sprintf(lbuf, "%s/etc/fstab", rootdev);
288 if ((fd = open(lbuf, O_RDONLY)) < 0)
291 /* loop reading lines from /etc/fstab What was that about sscanf again? */
293 while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) {
294 if ((lbuf[0] == 0) || (lbuf[0] == '#'))
297 /* skip device name */
298 for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++)
300 if (*cp == 0) /* misformatted */
302 /* delimit and save */
306 /* skip whitespace up to mountpoint */
307 while ((*cp != 0) && isspace(*cp))
309 /* must have /<space> to be root */
310 if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1)))
312 /* skip whitespace up to fstype */
314 while ((*cp != 0) && isspace(*cp))
316 if (*cp == 0) /* misformatted */
318 /* skip text to end of fstype and delimit */
320 while ((*cp != 0) && !isspace(*cp))
325 /* build the final result and save it */
326 sprintf(lbuf, "%s:%s", fstyp, dev);
329 setenv("vfs.root.mountfrom", lbuf, 0);