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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
31 * Loading modules, booting the system
37 #include <sys/reboot.h>
40 #include "bootstrap.h"
42 static int autoboot(int timeout, char *prompt);
43 static char *getbootfile(int try);
44 static int loadakernel(int try, int argc, char* argv[]);
46 /* List of kernel names to try (may be overwritten by boot.config) XXX should move from here? */
47 static const char *default_bootfiles = "kernel";
49 static int autoboot_tried;
52 * The user wants us to boot.
54 COMMAND_SET(boot, "boot", "boot a file or loaded kernel", command_boot);
57 command_boot(int argc, char *argv[])
59 struct preloaded_file *fp;
62 * See if the user has specified an explicit kernel to boot.
64 if ((argc > 1) && (argv[1][0] != '-')) {
66 /* XXX maybe we should discard everything and start again? */
67 if (file_findfile(NULL, NULL) != NULL) {
68 snprintf(command_errbuf, sizeof(command_errbuf),
69 "can't boot '%s', kernel module already loaded", argv[1]);
73 /* find/load the kernel module */
74 if (mod_loadkld(argv[1], argc - 2, argv + 2) != 0)
76 /* we have consumed all arguments */
81 * See if there is a kernel module already loaded
83 if (file_findfile(NULL, NULL) == NULL)
84 if (loadakernel(0, argc - 1, argv + 1))
85 /* we have consumed all arguments */
89 * Loaded anything yet?
91 if ((fp = file_findfile(NULL, NULL)) == NULL) {
92 command_errmsg = "no bootable kernel";
97 * If we were given arguments, discard any previous.
98 * XXX should we merge arguments? Hard to DWIM.
101 if (fp->f_args != NULL)
103 fp->f_args = unargv(argc - 1, argv + 1);
106 /* Hook for platform-specific autoloading of modules */
107 if (archsw.arch_autoload() != 0)
110 #ifdef LOADER_VERIEXEC
111 verify_pcr_export(); /* for measured boot */
112 #ifdef LOADER_VERIEXEC_PASS_MANIFEST
113 pass_manifest_export_envs();
117 /* Pass the tslog buffer to the kernel as a preloaded module. */
120 /* Call the exec handler from the loader matching the kernel */
121 file_formats[fp->f_loader]->l_exec(fp);
127 * Autoboot after a delay
130 COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay", command_autoboot);
133 command_autoboot(int argc, char *argv[])
145 howlong = strtol(argv[1], &cp, 0);
147 snprintf(command_errbuf, sizeof(command_errbuf),
148 "bad delay '%s'", argv[1]);
153 return(autoboot(howlong, prompt));
156 command_errmsg = "too many arguments";
161 * Called before we go interactive. If we think we can autoboot, and
162 * we haven't tried already, try now.
169 cp = getenv("autoboot_delay");
170 if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO")))
171 autoboot(-1, NULL); /* try to boot automatically */
175 autoboot(int timeout, char *prompt)
177 time_t when, otime, ntime;
179 char *argv[2], *cp, *ep;
181 #ifdef BOOT_PROMPT_123
182 const char *seq = "123", *p = seq;
189 /* try to get a delay from the environment */
190 if ((cp = getenv("autoboot_delay"))) {
191 timeout = strtol(cp, &ep, 0);
193 timeout = 10; /* Unparseable? Set default! */
197 kernelname = getenv("kernelname");
198 if (kernelname == NULL) {
200 loadakernel(0, 0, argv);
201 kernelname = getenv("kernelname");
202 if (kernelname == NULL) {
203 command_errmsg = "no valid kernel found";
211 when = ntime + timeout; /* when to boot */
215 #ifdef BOOT_PROMPT_123
216 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or "
217 "1 2 3 sequence for command prompt." : prompt);
219 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt);
225 #ifdef BOOT_PROMPT_123
226 if ((c == '\r') || (c == '\n')) {
229 } else if (c != *p++)
234 if ((c == '\r') || (c == '\n'))
245 if (ntime != otime) {
246 printf("\rBooting [%s] in %d second%s... ",
247 kernelname, (int)(when - ntime),
248 (when-ntime)==1?"":"s");
257 printf("\rBooting [%s]... ", kernelname);
262 return(command_boot(1, argv));
268 * Scrounge for the name of the (try)'th file we will try to boot.
273 static char *name = NULL;
274 const char *spec, *ep;
277 /* we use dynamic storage */
284 * Try $bootfile, then try our builtin default
286 if ((spec = getenv("bootfile")) == NULL)
287 spec = default_bootfiles;
289 while ((try > 0) && (spec != NULL)) {
290 spec = strchr(spec, ';');
292 spec++; /* skip over the leading ';' */
296 if ((ep = strchr(spec, ';')) != NULL) {
301 name = malloc(len + 1);
302 strncpy(name, spec, len);
305 if (name && name[0] == 0) {
313 * Try to find the /etc/fstab file on the filesystem (rootdev),
314 * which should be the root filesystem, and parse it to find
315 * out what the kernel ought to think the root filesystem is.
317 * If we're successful, set vfs.root.mountfrom to <vfstype>:<path>
318 * so that the kernel can tell both which VFS and which node to use
319 * to mount the device. If this variable's already set, don't
323 getrootmount(char *rootdev)
325 char lbuf[KENV_MVALLEN], *cp, *ep, *dev, *fstyp, *options;
328 if (getenv("vfs.root.mountfrom") != NULL)
332 snprintf(lbuf, sizeof(lbuf), "%s/etc/fstab", rootdev);
333 if ((fd = open(lbuf, O_RDONLY)) < 0)
336 /* loop reading lines from /etc/fstab What was that about sscanf again? */
339 while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) {
340 if ((lbuf[0] == 0) || (lbuf[0] == '#'))
343 /* skip device name */
344 for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++)
346 if (*cp == 0) /* misformatted */
348 /* delimit and save */
353 /* skip whitespace up to mountpoint */
354 while ((*cp != 0) && isspace(*cp))
356 /* must have /<space> to be root */
357 if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1)))
359 /* skip whitespace up to fstype */
361 while ((*cp != 0) && isspace(*cp))
363 if (*cp == 0) /* misformatted */
365 /* skip text to end of fstype and delimit */
367 while ((*cp != 0) && !isspace(*cp))
373 /* skip whitespace up to mount options */
375 while ((*cp != 0) && isspace(*cp))
377 if (*cp == 0) /* misformatted */
379 /* skip text to end of mount options and delimit */
381 while ((*cp != 0) && !isspace(*cp))
384 options = strdup(ep);
385 /* Build the <fstype>:<device> and save it in vfs.root.mountfrom */
386 snprintf(lbuf, sizeof(lbuf), "%s:%s", fstyp, dev);
387 setenv("vfs.root.mountfrom", lbuf, 0);
389 /* Don't override vfs.root.mountfrom.options if it is already set */
390 if (getenv("vfs.root.mountfrom.options") == NULL) {
391 /* save mount options */
392 setenv("vfs.root.mountfrom.options", options, 0);
406 currdev = getenv("currdev");
407 if (currdev != NULL && strncmp("zfs:", currdev, 4) == 0) {
408 cp = strdup(currdev);
409 cp[strlen(cp) - 1] = '\0';
410 setenv("vfs.root.mountfrom", cp, 0);
420 loadakernel(int try, int argc, char* argv[])
424 for (try = 0; (cp = getbootfile(try)) != NULL; try++)
425 if (mod_loadkld(cp, argc - 1, argv + 1) != 0)
426 printf("can't load '%s'\n", cp);