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 __FBSDID("$FreeBSD$"); 29 30 /* 31 * Loading modules, booting the system 32 */ 33 34 #include <stand.h> 35 #include <string.h> 36 37 #include "bootstrap.h" 38 39 static char *getbootfile(int try); 40 static int loadakernel(int try, int argc, char* argv[]); 41 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"; 44 45 static int autoboot_tried; 46 47 /* 48 * The user wants us to boot. 49 */ 50 COMMAND_SET(boot, "boot", "boot a file or loaded kernel", command_boot); 51 52 static int 53 command_boot(int argc, char *argv[]) 54 { 55 struct preloaded_file *fp; 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 snprintf(command_errbuf, sizeof (command_errbuf), 65 "can't boot '%s', kernel module already loaded", argv[1]); 66 return(CMD_ERROR); 67 } 68 69 /* find/load the kernel module */ 70 if (mod_loadkld(argv[1], argc - 2, argv + 2) != 0) 71 return(CMD_ERROR); 72 /* we have consumed all arguments */ 73 argc = 1; 74 } 75 76 /* 77 * See if there is a kernel module already loaded 78 */ 79 if (file_findfile(NULL, NULL) == NULL) 80 if (loadakernel(0, argc - 1, argv + 1)) 81 /* we have consumed all arguments */ 82 argc = 1; 83 84 /* 85 * Loaded anything yet? 86 */ 87 if ((fp = file_findfile(NULL, NULL)) == NULL) { 88 command_errmsg = "no bootable kernel"; 89 return(CMD_ERROR); 90 } 91 92 /* 93 * If we were given arguments, discard any previous. 94 * XXX should we merge arguments? Hard to DWIM. 95 */ 96 if (argc > 1) { 97 if (fp->f_args != NULL) 98 free(fp->f_args); 99 fp->f_args = unargv(argc - 1, argv + 1); 100 } 101 102 /* Hook for platform-specific autoloading of modules */ 103 if (archsw.arch_autoload() != 0) 104 return(CMD_ERROR); 105 106 /* Call the exec handler from the loader matching the kernel */ 107 file_formats[fp->f_loader]->l_exec(fp); 108 return(CMD_ERROR); 109 } 110 111 112 /* 113 * Autoboot after a delay 114 */ 115 116 COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay", command_autoboot); 117 118 static int 119 command_autoboot(int argc, char *argv[]) 120 { 121 int howlong; 122 char *cp, *prompt; 123 124 prompt = NULL; 125 howlong = -1; 126 switch(argc) { 127 case 3: 128 prompt = argv[2]; 129 /* FALLTHROUGH */ 130 case 2: 131 howlong = strtol(argv[1], &cp, 0); 132 if (*cp != 0) { 133 snprintf(command_errbuf, sizeof (command_errbuf), 134 "bad delay '%s'", argv[1]); 135 return(CMD_ERROR); 136 } 137 /* FALLTHROUGH */ 138 case 1: 139 return(autoboot(howlong, prompt)); 140 } 141 142 command_errmsg = "too many arguments"; 143 return(CMD_ERROR); 144 } 145 146 /* 147 * Called before we go interactive. If we think we can autoboot, and 148 * we haven't tried already, try now. 149 */ 150 void 151 autoboot_maybe(void) 152 { 153 char *cp; 154 155 /* compatibility with sparc prom, check for autoboot? */ 156 cp = getenv("autoboot?"); 157 if (cp != NULL && strcasecmp(cp, "true") != 0) 158 return; 159 cp = getenv("autoboot_delay"); 160 if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO"))) 161 autoboot(-1, NULL); /* try to boot automatically */ 162 } 163 164 int 165 autoboot(int timeout, char *prompt) 166 { 167 time_t when, otime, ntime; 168 int c, yes; 169 char *argv[2], *cp, *ep; 170 char *kernelname; 171 struct preloaded_file *fp; 172 173 autoboot_tried = 1; 174 175 if (timeout == -1) { 176 timeout = 10; 177 /* try to get a delay from the environment */ 178 if ((cp = getenv("autoboot_delay"))) { 179 timeout = strtol(cp, &ep, 0); 180 if (cp == ep) 181 timeout = 10; /* Unparseable? Set default! */ 182 } 183 } 184 185 fp = file_findfile(NULL, NULL); 186 if (fp == NULL) { /* no preloaded files, run command start to load all */ 187 bf_run("start"); 188 fp = file_findfile(NULL, NULL); 189 if (fp == NULL) { /* still nothing? can't boot */ 190 command_errmsg = "no valid kernel found"; 191 return(CMD_ERROR); 192 } 193 } 194 195 kernelname = fp->f_name; 196 197 if (timeout >= 0) { 198 otime = time(NULL); 199 when = otime + timeout; /* when to boot */ 200 201 yes = 0; 202 203 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt); 204 205 for (;;) { 206 if (ischar()) { 207 c = getchar(); 208 if ((c == '\r') || (c == '\n')) 209 yes = 1; 210 break; 211 } 212 ntime = time(NULL); 213 if (ntime >= when) { 214 yes = 1; 215 break; 216 } 217 218 if (ntime != otime) { 219 printf("\rBooting [%s] in %d second%s... ", 220 kernelname, (int)(when - ntime), 221 (when-ntime)==1?"":"s"); 222 otime = ntime; 223 } 224 } 225 } else { 226 yes = 1; 227 } 228 229 if (yes) 230 printf("\rBooting [%s]... ", kernelname); 231 putchar('\n'); 232 if (yes) { 233 argv[0] = "boot"; 234 argv[1] = NULL; 235 return(command_boot(1, argv)); 236 } 237 return(CMD_OK); 238 } 239 240 /* 241 * Scrounge for the name of the (try)'th file we will try to boot. 242 */ 243 static char * 244 getbootfile(int try) 245 { 246 static char *name = NULL; 247 const char *spec, *ep; 248 size_t len; 249 250 /* we use dynamic storage */ 251 if (name != NULL) { 252 free(name); 253 name = NULL; 254 } 255 256 /* 257 * Try $bootfile, then try our builtin default 258 */ 259 if ((spec = getenv("bootfile")) == NULL) 260 spec = default_bootfiles; 261 262 while ((try > 0) && (spec != NULL)) { 263 spec = strchr(spec, ';'); 264 if (spec) 265 spec++; /* skip over the leading ';' */ 266 try--; 267 } 268 if (spec != NULL) { 269 if ((ep = strchr(spec, ';')) != NULL) { 270 len = ep - spec; 271 } else { 272 len = strlen(spec); 273 } 274 name = malloc(len + 1); 275 strncpy(name, spec, len); 276 name[len] = 0; 277 } 278 if (name && name[0] == 0) { 279 free(name); 280 name = NULL; 281 } 282 return(name); 283 } 284 285 /* 286 * Try to find the /etc/fstab file on the filesystem (rootdev), 287 * which should be be the root filesystem, and parse it to find 288 * out what the kernel ought to think the root filesystem is. 289 * 290 * If we're successful, set vfs.root.mountfrom to <vfstype>:<path> 291 * so that the kernel can tell both which VFS and which node to use 292 * to mount the device. If this variable's already set, don't 293 * overwrite it. 294 */ 295 int 296 getrootmount(char *rootdev) 297 { 298 char lbuf[128], *cp, *ep, *dev, *fstyp, *options; 299 int fd, error; 300 301 if (getenv("vfs.root.mountfrom") != NULL) 302 return(0); 303 304 error = 1; 305 sprintf(lbuf, "%s/etc/fstab", rootdev); 306 if ((fd = open(lbuf, O_RDONLY)) < 0) 307 goto notfound; 308 309 /* loop reading lines from /etc/fstab What was that about sscanf again? */ 310 while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) { 311 if ((lbuf[0] == 0) || (lbuf[0] == '#')) 312 continue; 313 314 /* skip device name */ 315 for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++) 316 ; 317 if (*cp == 0) /* misformatted */ 318 continue; 319 /* delimit and save */ 320 *cp++ = 0; 321 dev = strdup(lbuf); 322 323 /* skip whitespace up to mountpoint */ 324 while ((*cp != 0) && isspace(*cp)) 325 cp++; 326 /* must have /<space> to be root */ 327 if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1))) 328 continue; 329 /* skip whitespace up to fstype */ 330 cp += 2; 331 while ((*cp != 0) && isspace(*cp)) 332 cp++; 333 if (*cp == 0) /* misformatted */ 334 continue; 335 /* skip text to end of fstype and delimit */ 336 ep = cp; 337 while ((*cp != 0) && !isspace(*cp)) 338 cp++; 339 *cp = 0; 340 fstyp = strdup(ep); 341 342 /* skip whitespace up to mount options */ 343 cp += 1; 344 while ((*cp != 0) && isspace(*cp)) 345 cp++; 346 if (*cp == 0) /* misformatted */ 347 continue; 348 /* skip text to end of mount options and delimit */ 349 ep = cp; 350 while ((*cp != 0) && !isspace(*cp)) 351 cp++; 352 *cp = 0; 353 options = strdup(ep); 354 /* Build the <fstype>:<device> and save it in vfs.root.mountfrom */ 355 sprintf(lbuf, "%s:%s", fstyp, dev); 356 free(dev); 357 free(fstyp); 358 setenv("vfs.root.mountfrom", lbuf, 0); 359 360 /* Don't override vfs.root.mountfrom.options if it is already set */ 361 if (getenv("vfs.root.mountfrom.options") == NULL) { 362 /* save mount options */ 363 setenv("vfs.root.mountfrom.options", options, 0); 364 } 365 free(options); 366 error = 0; 367 break; 368 } 369 close(fd); 370 371 notfound: 372 if (error) { 373 const char *currdev; 374 375 currdev = getenv("currdev"); 376 if (currdev != NULL && strncmp("zfs:", currdev, 4) == 0) { 377 cp = strdup(currdev); 378 cp[strlen(cp) - 1] = '\0'; 379 setenv("vfs.root.mountfrom", cp, 0); 380 error = 0; 381 } 382 } 383 384 return(error); 385 } 386 387 static int 388 loadakernel(int try, int argc, char* argv[]) 389 { 390 char *cp; 391 392 for (try = 0; (cp = getbootfile(try)) != NULL; try++) 393 if (mod_loadkld(cp, argc - 1, argv + 1) != 0) 394 printf("can't load '%s'\n", cp); 395 else 396 return 1; 397 return 0; 398 } 399