1 /*
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28
29 /*
30 * Loading modules, booting the system
31 */
32
33 #include <stand.h>
34 #include <string.h>
35
36 #include "bootstrap.h"
37
38 static char *getbootfile(int try);
39 static int loadakernel(int try, int argc, char *argv[]);
40
41 /*
42 * List of kernel names to try (may be overwritten by boot.config)
43 * XXX should move from here?
44 */
45 static const char *default_bootfiles = "kernel";
46
47 static int autoboot_tried;
48
49 /*
50 * The user wants us to boot.
51 */
52 COMMAND_SET(boot, "boot", "boot a file or loaded kernel", command_boot);
53
54 static int
command_boot(int argc,char * argv[])55 command_boot(int argc, char *argv[])
56 {
57 struct preloaded_file *fp;
58
59 /*
60 * See if the user has specified an explicit kernel to boot.
61 */
62 if ((argc > 1) && (argv[1][0] == '/')) {
63
64 /* XXX maybe we should discard everything and start again? */
65 if (file_findfile(NULL, NULL) != NULL) {
66 snprintf(command_errbuf, sizeof (command_errbuf),
67 "can't boot '%s', kernel module already loaded",
68 argv[1]);
69 return (CMD_ERROR);
70 }
71
72 /* find/load the kernel module */
73 if (mod_loadkld(argv[1], argc - 2, argv + 2) != 0)
74 return (CMD_ERROR);
75 /* we have consumed all arguments */
76 argc = 1;
77 }
78
79 /*
80 * See if there is a kernel module already loaded
81 */
82 if (file_findfile(NULL, NULL) == NULL)
83 if (loadakernel(0, argc - 1, argv + 1)) {
84 /* we have consumed all arguments */
85 argc = 1;
86 }
87
88 /*
89 * Loaded anything yet?
90 */
91 if ((fp = file_findfile(NULL, NULL)) == NULL) {
92 command_errmsg = "no bootable kernel";
93 return (CMD_ERROR);
94 }
95
96 /*
97 * If we were given arguments, discard any previous.
98 * XXX should we merge arguments? Hard to DWIM.
99 */
100 if (argc > 1) {
101 free(fp->f_args);
102 fp->f_args = unargv(argc - 1, argv + 1);
103 }
104
105 /* Hook for platform-specific autoloading of modules */
106 if (archsw.arch_autoload() != 0)
107 return (CMD_ERROR);
108
109 /* Call the exec handler from the loader matching the kernel */
110 file_formats[fp->f_loader]->l_exec(fp);
111 return (CMD_ERROR);
112 }
113
114
115 /*
116 * Autoboot after a delay
117 */
118
119 COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay",
120 command_autoboot);
121
122 static int
command_autoboot(int argc,char * argv[])123 command_autoboot(int argc, char *argv[])
124 {
125 int howlong;
126 char *cp, *prompt;
127
128 prompt = NULL;
129 howlong = -1;
130 switch (argc) {
131 case 3:
132 prompt = argv[2];
133 /* FALLTHROUGH */
134 case 2:
135 howlong = strtol(argv[1], &cp, 0);
136 if (*cp != 0) {
137 snprintf(command_errbuf, sizeof (command_errbuf),
138 "bad delay '%s'", argv[1]);
139 return (CMD_ERROR);
140 }
141 /* FALLTHROUGH */
142 case 1:
143 return (autoboot(howlong, prompt));
144 }
145
146 command_errmsg = "too many arguments";
147 return (CMD_ERROR);
148 }
149
150 /*
151 * Called before we go interactive. If we think we can autoboot, and
152 * we haven't tried already, try now.
153 */
154 void
autoboot_maybe(void)155 autoboot_maybe(void)
156 {
157 char *cp;
158
159 /* compatibility with sparc prom, check for autoboot? */
160 cp = getenv("autoboot?");
161 if (cp != NULL && strcasecmp(cp, "true") != 0)
162 return;
163 cp = getenv("autoboot_delay");
164 if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO")))
165 autoboot(-1, NULL); /* try to boot automatically */
166 }
167
168 int
autoboot(int timeout,char * prompt)169 autoboot(int timeout, char *prompt)
170 {
171 time_t when, otime, ntime;
172 int c, yes;
173 char *argv[2], *cp, *ep;
174 char *kernelname;
175 struct preloaded_file *fp;
176
177 autoboot_tried = 1;
178
179 if (timeout == -1) {
180 timeout = 10;
181 /* try to get a delay from the environment */
182 if ((cp = getenv("autoboot_delay"))) {
183 timeout = strtol(cp, &ep, 0);
184 if (cp == ep)
185 timeout = 10; /* Unparseable? Set default! */
186 }
187 }
188
189 fp = file_findfile(NULL, NULL);
190 if (fp == NULL) {
191 /* no preloaded files, run command start to load all */
192 bf_run("start");
193 fp = file_findfile(NULL, NULL);
194 if (fp == NULL) { /* still nothing? can't boot */
195 command_errmsg = "no valid kernel found";
196 return (CMD_ERROR);
197 }
198 }
199
200 kernelname = fp->f_name;
201
202 if (timeout >= 0) {
203 otime = time(NULL);
204 when = otime + timeout; /* when to boot */
205
206 yes = 0;
207
208 printf("%s\n", (prompt == NULL) ?
209 "Hit [Enter] to boot immediately, or any other key "
210 "for command prompt." : prompt);
211
212 for (;;) {
213 if (ischar()) {
214 c = getchar();
215 if ((c == '\r') || (c == '\n'))
216 yes = 1;
217 break;
218 }
219 ntime = time(NULL);
220 if (ntime >= when) {
221 yes = 1;
222 break;
223 }
224
225 if (ntime != otime) {
226 printf("\rBooting [%s] in %d second%s... ",
227 kernelname, (int)(when - ntime),
228 (when - ntime) == 1? "":"s");
229 otime = ntime;
230 }
231 }
232 } else {
233 yes = 1;
234 }
235
236 if (yes)
237 printf("\rBooting [%s]... ", kernelname);
238 putchar('\n');
239 if (yes) {
240 argv[0] = "boot";
241 argv[1] = NULL;
242 return (command_boot(1, argv));
243 }
244 return (CMD_OK);
245 }
246
247 /*
248 * Scrounge for the name of the (try)'th file we will try to boot.
249 */
250 static char *
getbootfile(int try)251 getbootfile(int try)
252 {
253 static char *name = NULL;
254 const char *spec, *ep;
255 size_t len;
256
257 /* we use dynamic storage */
258 free(name);
259 name = NULL;
260
261 /*
262 * Try $bootfile, then try our builtin default
263 */
264 if ((spec = getenv("bootfile")) == NULL)
265 spec = default_bootfiles;
266
267 while ((try > 0) && (spec != NULL)) {
268 spec = strchr(spec, ';');
269 if (spec)
270 spec++; /* skip over the leading ';' */
271 try--;
272 }
273 if (spec != NULL) {
274 if ((ep = strchr(spec, ';')) != NULL) {
275 len = ep - spec;
276 } else {
277 len = strlen(spec);
278 }
279 name = malloc(len + 1);
280 strncpy(name, spec, len);
281 name[len] = 0;
282 }
283 if (name && name[0] == 0) {
284 free(name);
285 name = NULL;
286 }
287 return (name);
288 }
289
290 /*
291 * Try to find the /etc/fstab file on the filesystem (rootdev),
292 * which should be be the root filesystem, and parse it to find
293 * out what the kernel ought to think the root filesystem is.
294 *
295 * If we're successful, set vfs.root.mountfrom to <vfstype>:<path>
296 * so that the kernel can tell both which VFS and which node to use
297 * to mount the device. If this variable's already set, don't
298 * overwrite it.
299 */
300 int
getrootmount(char * rootdev)301 getrootmount(char *rootdev)
302 {
303 char lbuf[128], *cp, *ep, *dev, *fstyp, *options;
304 int fd, error;
305
306 if (getenv("vfs.root.mountfrom") != NULL)
307 return (0);
308
309 error = 1;
310 sprintf(lbuf, "%s/etc/fstab", rootdev);
311 if ((fd = open(lbuf, O_RDONLY)) < 0)
312 goto notfound;
313
314 /*
315 * loop reading lines from /etc/fstab
316 * What was that about sscanf again?
317 */
318 fstyp = NULL;
319 dev = NULL;
320 while (fgetstr(lbuf, sizeof (lbuf), fd) >= 0) {
321 if ((lbuf[0] == 0) || (lbuf[0] == '#'))
322 continue;
323
324 /* skip device name */
325 for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++)
326 ;
327 if (*cp == 0) /* misformatted */
328 continue;
329 /* delimit and save */
330 *cp++ = 0;
331 free(dev);
332 dev = strdup(lbuf);
333
334 /* skip whitespace up to mountpoint */
335 while ((*cp != 0) && isspace(*cp))
336 cp++;
337 /* must have /<space> to be root */
338 if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1)))
339 continue;
340 /* skip whitespace up to fstype */
341 cp += 2;
342 while ((*cp != 0) && isspace(*cp))
343 cp++;
344 if (*cp == 0) /* misformatted */
345 continue;
346 /* skip text to end of fstype and delimit */
347 ep = cp;
348 while ((*cp != 0) && !isspace(*cp))
349 cp++;
350 *cp = 0;
351 free(fstyp);
352 fstyp = strdup(ep);
353
354 /* skip whitespace up to mount options */
355 cp += 1;
356 while ((*cp != 0) && isspace(*cp))
357 cp++;
358 if (*cp == 0) /* misformatted */
359 continue;
360 /* skip text to end of mount options and delimit */
361 ep = cp;
362 while ((*cp != 0) && !isspace(*cp))
363 cp++;
364 *cp = 0;
365 options = strdup(ep);
366 /*
367 * Build the <fstype>:<device> and save it in
368 * vfs.root.mountfrom
369 */
370 sprintf(lbuf, "%s:%s", fstyp, dev);
371 setenv("vfs.root.mountfrom", lbuf, 0);
372
373 /*
374 * Don't override vfs.root.mountfrom.options if it is
375 * already set
376 */
377 if (getenv("vfs.root.mountfrom.options") == NULL) {
378 /* save mount options */
379 setenv("vfs.root.mountfrom.options", options, 0);
380 }
381 free(options);
382 error = 0;
383 break;
384 }
385 close(fd);
386 free(dev);
387 free(fstyp);
388
389 notfound:
390 if (error) {
391 const char *currdev;
392
393 currdev = getenv("currdev");
394 if (currdev != NULL && strncmp("zfs:", currdev, 4) == 0) {
395 cp = strdup(currdev);
396 cp[strlen(cp) - 1] = '\0';
397 setenv("vfs.root.mountfrom", cp, 0);
398 error = 0;
399 free(cp);
400 }
401 }
402
403 return (error);
404 }
405
406 static int
loadakernel(int try,int argc,char * argv[])407 loadakernel(int try, int argc, char *argv[])
408 {
409 char *cp;
410
411 for (try = 0; (cp = getbootfile(try)) != NULL; try++)
412 if (mod_loadkld(cp, argc - 1, argv + 1) != 0)
413 printf("can't load '%s'\n", cp);
414 else
415 return (1);
416 return (0);
417 }
418