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 1.29 2003/08/25 23:30:41 obrien Exp $
27 * $DragonFly: src/sys/boot/common/boot.c,v 1.4 2005/12/10 00:39:48 swildner Exp $
31 * Loading modules, booting the system
37 #include "bootstrap.h"
39 static char *getbootfile(int try);
40 static int loadakernel(int try, int argc, char* argv[]);
42 /* List of kernel names to try (may be overwritten by boot.config) XXX should move from here? */
43 static const char *default_bootfiles = "kernel";
45 static int autoboot_tried;
48 * The user wants us to boot.
50 COMMAND_SET(boot, "boot", "boot a file or loaded kernel", command_boot);
53 command_boot(int argc, char *argv[])
55 struct preloaded_file *fp;
56 char *local_module_path;
57 char *exported_module_path;
60 * See if the user has specified an explicit kernel to boot.
62 if ((argc > 1) && (argv[1][0] != '-')) {
64 /* XXX maybe we should discard everything and start again? */
65 if (file_findfile(NULL, NULL) != NULL) {
66 sprintf(command_errbuf, "can't boot '%s', kernel module already loaded", argv[1]);
70 /* find/load the kernel module */
71 if (mod_loadkld(argv[1], argc - 2, argv + 2) != 0)
73 /* we have consumed all arguments */
78 * See if there is a kernel module already loaded
80 if (file_findfile(NULL, NULL) == NULL)
81 if (loadakernel(0, argc - 1, argv + 1))
82 /* we have consumed all arguments */
86 * Loaded anything yet?
88 if ((fp = file_findfile(NULL, NULL)) == NULL) {
89 command_errmsg = "no bootable kernel";
94 * If we were given arguments, discard any previous.
95 * XXX should we merge arguments? Hard to DWIM.
98 if (fp->f_args != NULL)
100 fp->f_args = unargv(argc - 1, argv + 1);
103 /* Hook for platform-specific autoloading of modules */
104 if (archsw.arch_autoload() != 0)
108 * Exec the kernel. We have to shift our exported_module_path
109 * (which has the correct /boot prefix for the kernel) over to
110 * module_path. If the exec fails we switch it back.
112 exported_module_path = getenv("exported_module_path");
113 if (exported_module_path) {
114 exported_module_path = strdup(exported_module_path);
115 local_module_path = getenv("module_path");
116 if (local_module_path)
117 local_module_path = strdup(local_module_path);
118 setenv("module_path", exported_module_path, 1);
119 unsetenv("exported_module_path");
122 /* Call the exec handler from the loader matching the kernel */
123 file_formats[fp->f_loader]->l_exec(fp);
125 if (exported_module_path) {
126 if (local_module_path) {
127 setenv("module_path", local_module_path, 1);
128 free(local_module_path);
130 unsetenv("module_path");
132 setenv("exported_module_path", exported_module_path, 1);
133 free(exported_module_path);
140 * Autoboot after a delay
143 COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay", command_autoboot);
146 command_autoboot(int argc, char *argv[])
158 howlong = strtol(argv[1], &cp, 0);
160 sprintf(command_errbuf, "bad delay '%s'", argv[1]);
165 return(autoboot(howlong, prompt));
168 command_errmsg = "too many arguments";
173 * Called before we go interactive. If we think we can autoboot, and
174 * we haven't tried already, try now.
181 cp = getenv("autoboot_delay");
182 if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO")))
183 autoboot(-1, NULL); /* try to boot automatically */
187 autoboot(int timeout, char *prompt)
189 time_t when, otime, ntime;
191 char *argv[2], *cp, *ep;
197 /* try to get a delay from the environment */
198 if ((cp = getenv("autoboot_delay"))) {
199 timeout = strtol(cp, &ep, 0);
204 if (timeout == -1) /* all else fails */
207 kernelname = getenv("kernelname");
208 if (kernelname == NULL) {
210 loadakernel(0, 0, argv);
211 kernelname = getenv("kernelname");
212 if (kernelname == NULL) {
213 command_errmsg = "no valid kernel found";
219 when = otime + timeout; /* when to boot */
222 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt);
227 if ((c == '\r') || (c == '\n'))
237 if (ntime != otime) {
238 printf("\rBooting [%s] in %d second%s... ",
239 kernelname, (int)(when - ntime),
240 (when-ntime)==1?"":"s");
245 printf("\rBooting [%s]... ", kernelname);
250 return(command_boot(1, argv));
256 * Scrounge for the name of the (try)'th file we will try to boot.
261 static char *name = NULL;
262 const char *spec, *ep;
265 /* we use dynamic storage */
272 * Try $bootfile, then try our builtin default
274 if ((spec = getenv("bootfile")) == NULL)
275 spec = default_bootfiles;
277 while ((try > 0) && (spec != NULL)) {
278 spec = strchr(spec, ';');
280 spec++; /* skip over the leading ';' */
284 if ((ep = strchr(spec, ';')) != NULL) {
289 name = malloc(len + 1);
290 strncpy(name, spec, len);
293 if (name && name[0] == 0) {
301 * Try to find the /etc/fstab file on the filesystem (rootdev),
302 * which should be be the root filesystem, and parse it to find
303 * out what the kernel ought to think the root filesystem is.
305 * If we're successful, set vfs.root.mountfrom to <vfstype>:<path>
306 * so that the kernel can tell both which VFS and which node to use
307 * to mount the device. If this variable's already set, don't
311 getrootmount(char *rootdev)
313 char lbuf[128], *cp, *ep, *dev, *fstyp;
316 if (getenv("vfs.root.mountfrom") != NULL)
319 sprintf(lbuf, "%s/etc/fstab", rootdev);
320 if ((fd = open(lbuf, O_RDONLY)) < 0)
323 /* loop reading lines from /etc/fstab What was that about sscanf again? */
325 while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) {
326 if ((lbuf[0] == 0) || (lbuf[0] == '#'))
329 /* skip device name */
330 for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++)
332 if (*cp == 0) /* misformatted */
334 /* delimit and save */
338 /* skip whitespace up to mountpoint */
339 while ((*cp != 0) && isspace(*cp))
341 /* must have /<space> to be root */
342 if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1)))
344 /* skip whitespace up to fstype */
346 while ((*cp != 0) && isspace(*cp))
348 if (*cp == 0) /* misformatted */
350 /* skip text to end of fstype and delimit */
352 while ((*cp != 0) && !isspace(*cp))
357 /* build the final result and save it */
358 sprintf(lbuf, "%s:%s", fstyp, dev);
361 setenv("vfs.root.mountfrom", lbuf, 0);
370 loadakernel(int try, int argc, char* argv[])
374 for (try = 0; (cp = getbootfile(try)) != NULL; try++)
375 if (mod_loadkld(cp, argc - 1, argv + 1) != 0)
376 printf("can't load '%s'\n", cp);