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 * $FreeBSD: head/sys/boot/common/boot.c 61659 2000-06-14 10:34:29Z ps $
|
| 26 * $FreeBSD: head/sys/boot/common/boot.c 64187 2000-08-03 09:14:02Z jhb $ |
27 */
28
29/*
30 * Loading modules, booting the system
31 */
32
33#include <stand.h>
34#include <string.h>
35
36#include "bootstrap.h"
37
38static char *getbootfile(int try);
39
40/* List of kernel names to try (may be overwritten by boot.config) XXX should move from here? */
|
41static char *default_bootfiles = "kernel;kernel.old";
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| 41static const char *default_bootfiles = "kernel;kernel.old"; |
42
43static int autoboot_tried;
44
45/*
46 * The user wants us to boot.
47 */
48COMMAND_SET(boot, "boot", "boot a file or loaded kernel", command_boot);
49
50static int
51command_boot(int argc, char *argv[])
52{
53 struct preloaded_file *fp;
54 char *cp;
55 int try;
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56 int i;
|
56
57 /*
58 * See if the user has specified an explicit kernel to boot.
59 */
60 if ((argc > 1) && (argv[1][0] != '-')) {
61
62 /* XXX maybe we should discard everything and start again? */
63 if (file_findfile(NULL, NULL) != NULL) {
64 sprintf(command_errbuf, "can't boot '%s', kernel module already loaded", argv[1]);
65 return(CMD_ERROR);
66 }
67
68 /* find/load the kernel module */
69 if (mod_load(argv[1], argc - 2, argv + 2) != 0)
70 return(CMD_ERROR);
71 /* we have consumed all arguments */
72 argc = 1;
73 }
74
75 /*
76 * See if there is a kernel module already loaded
77 */
78 if (file_findfile(NULL, NULL) == NULL) {
79 for (try = 0; (cp = getbootfile(try)) != NULL; try++) {
80 if (mod_load(cp, argc - 1, argv + 1) != 0) {
81 printf("can't load '%s'\n", cp);
82 } else {
83 /* we have consumed all arguments */
84 argc = 1;
85 break;
86 }
87 }
88 }
89
90 /*
91 * Loaded anything yet?
92 */
93 if ((fp = file_findfile(NULL, NULL)) == NULL) {
94 command_errmsg = "no bootable kernel";
95 return(CMD_ERROR);
96 }
97
98 /*
99 * If we were given arguments, discard any previous.
100 * XXX should we merge arguments? Hard to DWIM.
101 */
102 if (argc > 1) {
103 if (fp->f_args != NULL)
104 free(fp->f_args);
105 fp->f_args = unargv(argc - 1, argv + 1);
106 }
107
108 /* Hook for platform-specific autoloading of modules */
109 if (archsw.arch_autoload() != 0)
110 return(CMD_ERROR);
111
112 /* Call the exec handler from the loader matching the kernel */
113 file_formats[fp->f_loader]->l_exec(fp);
114 return(CMD_ERROR);
115}
116
117
118/*
119 * Autoboot after a delay
120 */
121
122COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay", command_autoboot);
123
124static int
125command_autoboot(int argc, char *argv[])
126{
127 int howlong;
128 char *cp, *prompt;
129
130 prompt = NULL;
131 howlong = -1;
132 switch(argc) {
133 case 3:
134 prompt = argv[2];
135 /* FALLTHROUGH */
136 case 2:
137 howlong = strtol(argv[1], &cp, 0);
138 if (*cp != 0) {
139 sprintf(command_errbuf, "bad delay '%s'", argv[1]);
140 return(CMD_ERROR);
141 }
142 /* FALLTHROUGH */
143 case 1:
144 return(autoboot(howlong, prompt));
145 }
146
147 command_errmsg = "too many arguments";
148 return(CMD_ERROR);
149}
150
151/*
152 * Called before we go interactive. If we think we can autoboot, and
153 * we haven't tried already, try now.
154 */
155void
156autoboot_maybe()
157{
158 char *cp;
159
160 cp = getenv("autoboot_delay");
161 if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO")))
162 autoboot(-1, NULL); /* try to boot automatically */
163}
164
165int
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167autoboot(int delay, char *prompt)
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| 166autoboot(int timeout, char *prompt) |
167{
168 time_t when, otime, ntime;
169 int c, yes;
170 char *argv[2], *cp, *ep;
171
172 autoboot_tried = 1;
173
|
175 if (delay == -1) {
|
| 174 if (timeout == -1) { |
175 /* try to get a delay from the environment */
176 if ((cp = getenv("autoboot_delay"))) {
|
178 delay = strtol(cp, &ep, 0);
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| 177 timeout = strtol(cp, &ep, 0); |
178 if (cp == ep)
|
180 delay = -1;
|
| 179 timeout = -1; |
180 }
181 }
|
183 if (delay == -1) /* all else fails */
184 delay = 10;
|
182 if (timeout == -1) /* all else fails */
183 timeout = 10; |
184
185 otime = time(NULL);
|
187 when = otime + delay; /* when to boot */
|
| 186 when = otime + timeout; /* when to boot */ |
187 yes = 0;
188
189 /* XXX could try to work out what we might boot */
190 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt);
191
192 for (;;) {
193 if (ischar()) {
194 c = getchar();
195 if ((c == '\r') || (c == '\n'))
196 yes = 1;
197 break;
198 }
199 ntime = time(NULL);
200 if (ntime >= when) {
201 yes = 1;
202 break;
203 }
204 if (ntime != otime) {
205 printf("\rBooting [%s] in %d second%s... ",
206 getbootfile(0), (int)(when - ntime),
207 (when-ntime)==1?"":"s");
208 otime = ntime;
209 }
210 }
211 if (yes)
212 printf("\rBooting [%s]... ", getbootfile(0));
213 putchar('\n');
214 if (yes) {
215 argv[0] = "boot";
216 argv[1] = NULL;
217 return(command_boot(1, argv));
218 }
219 return(CMD_OK);
220}
221
222/*
223 * Scrounge for the name of the (try)'th file we will try to boot.
224 */
225static char *
226getbootfile(int try)
227{
228 static char *name = NULL;
229 char *spec, *ep;
|
231 int len;
|
| 230 size_t len; |
231
232 /* we use dynamic storage */
233 if (name != NULL) {
234 free(name);
235 name = NULL;
236 }
237
238 /*
239 * Try $bootfile, then try our builtin default
240 */
241 if ((spec = getenv("bootfile")) == NULL)
242 spec = default_bootfiles;
243
244 while ((try > 0) && (spec != NULL)) {
245 spec = strchr(spec, ';');
246 if (spec)
247 spec++; /* skip over the leading ';' */
248 try--;
249 }
250 if (spec != NULL) {
251 if ((ep = strchr(spec, ';')) != NULL) {
252 len = ep - spec;
253 } else {
254 len = strlen(spec);
255 }
256 name = malloc(len + 1);
257 strncpy(name, spec, len);
258 name[len] = 0;
259 }
260 if (name[0] == 0) {
261 free(name);
262 name = NULL;
263 }
264 return(name);
265}
266
267/*
268 * Try to find the /etc/fstab file on the filesystem (rootdev),
269 * which should be be the root filesystem, and parse it to find
270 * out what the kernel ought to think the root filesystem is.
271 *
272 * If we're successful, set vfs.root.mountfrom to <vfstype>:<path>
273 * so that the kernel can tell both which VFS and which node to use
274 * to mount the device. If this variable's already set, don't
275 * overwrite it.
276 */
277int
278getrootmount(char *rootdev)
279{
280 char lbuf[128], *cp, *ep, *dev, *fstyp;
281 int fd, error;
282
283 if (getenv("vfs.root.mountfrom") != NULL)
284 return(0);
285
286 sprintf(lbuf, "%s/etc/fstab", rootdev);
287 if ((fd = open(lbuf, O_RDONLY)) < 0)
288 return(1);
289
290 /* loop reading lines from /etc/fstab What was that about sscanf again? */
291 error = 1;
292 while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) {
293 if ((lbuf[0] == 0) || (lbuf[0] == '#'))
294 continue;
295
296 /* skip device name */
297 for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++)
298 ;
299 if (*cp == 0) /* misformatted */
300 continue;
301 /* delimit and save */
302 *cp++ = 0;
303 dev = strdup(lbuf);
304
305 /* skip whitespace up to mountpoint */
306 while ((*cp != 0) && isspace(*cp))
307 cp++;
308 /* must have /<space> to be root */
309 if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1)))
310 continue;
311 /* skip whitespace up to fstype */
312 cp += 2;
313 while ((*cp != 0) && isspace(*cp))
314 cp++;
315 if (*cp == 0) /* misformatted */
316 continue;
317 /* skip text to end of fstype and delimit */
318 ep = cp;
319 while ((*cp != 0) && !isspace(*cp))
320 cp++;
321 *cp = 0;
322 fstyp = strdup(ep);
323
324 /* build the final result and save it */
325 sprintf(lbuf, "%s:%s", fstyp, dev);
326 free(dev);
327 free(fstyp);
328 setenv("vfs.root.mountfrom", lbuf, 0);
329 error = 0;
330 break;
331 }
332 close(fd);
333 return(error);
334}
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