kern_subr.c revision 1.215
1 /* $NetBSD: kern_subr.c,v 1.215 2014/11/22 10:24:02 mlelstv Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 1999, 2002, 2007, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center, and by Luke Mewburn. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1991, 1993 35 * The Regents of the University of California. All rights reserved. 36 * (c) UNIX System Laboratories, Inc. 37 * All or some portions of this file are derived from material licensed 38 * to the University of California by American Telephone and Telegraph 39 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 40 * the permission of UNIX System Laboratories, Inc. 41 * 42 * Copyright (c) 1992, 1993 43 * The Regents of the University of California. All rights reserved. 44 * 45 * This software was developed by the Computer Systems Engineering group 46 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 47 * contributed to Berkeley. 48 * 49 * All advertising materials mentioning features or use of this software 50 * must display the following acknowledgement: 51 * This product includes software developed by the University of 52 * California, Lawrence Berkeley Laboratory. 53 * 54 * Redistribution and use in source and binary forms, with or without 55 * modification, are permitted provided that the following conditions 56 * are met: 57 * 1. Redistributions of source code must retain the above copyright 58 * notice, this list of conditions and the following disclaimer. 59 * 2. Redistributions in binary form must reproduce the above copyright 60 * notice, this list of conditions and the following disclaimer in the 61 * documentation and/or other materials provided with the distribution. 62 * 3. Neither the name of the University nor the names of its contributors 63 * may be used to endorse or promote products derived from this software 64 * without specific prior written permission. 65 * 66 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 67 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 68 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 69 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 70 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 71 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 72 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 73 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 74 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 75 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 76 * SUCH DAMAGE. 77 * 78 * @(#)kern_subr.c 8.4 (Berkeley) 2/14/95 79 */ 80 81 #include <sys/cdefs.h> 82 __KERNEL_RCSID(0, "$NetBSD: kern_subr.c,v 1.215 2014/11/22 10:24:02 mlelstv Exp $"); 83 84 #include "opt_ddb.h" 85 #include "opt_md.h" 86 #include "opt_tftproot.h" 87 88 #include <sys/param.h> 89 #include <sys/systm.h> 90 #include <sys/proc.h> 91 #include <sys/mount.h> 92 #include <sys/device.h> 93 #include <sys/reboot.h> 94 #include <sys/conf.h> 95 #include <sys/disk.h> 96 #include <sys/disklabel.h> 97 #include <sys/queue.h> 98 #include <sys/fcntl.h> 99 #include <sys/kauth.h> 100 #include <sys/stat.h> 101 #include <sys/vnode.h> 102 #include <sys/module.h> 103 104 #include <dev/cons.h> 105 106 #include <net/if.h> 107 108 /* XXX these should eventually move to subr_autoconf.c */ 109 static device_t finddevice(const char *); 110 static device_t getdisk(char *, int, int, dev_t *, int); 111 static device_t parsedisk(char *, int, int, dev_t *); 112 static const char *getwedgename(const char *, int); 113 114 #ifdef TFTPROOT 115 int tftproot_dhcpboot(device_t); 116 #endif 117 118 dev_t dumpcdev; /* for savecore */ 119 120 static int 121 isswap(device_t dv) 122 { 123 struct dkwedge_info wi; 124 struct vnode *vn; 125 int error; 126 127 if (device_class(dv) != DV_DISK || !device_is_a(dv, "dk")) 128 return 0; 129 130 if ((vn = opendisk(dv)) == NULL) 131 return 0; 132 133 error = VOP_IOCTL(vn, DIOCGWEDGEINFO, &wi, FREAD, NOCRED); 134 VOP_CLOSE(vn, FREAD, NOCRED); 135 vput(vn); 136 if (error) { 137 #ifdef DEBUG_WEDGE 138 printf("%s: Get wedge info returned %d\n", device_xname(dv), error); 139 #endif 140 return 0; 141 } 142 return strcmp(wi.dkw_ptype, DKW_PTYPE_SWAP) == 0; 143 } 144 145 /* 146 * Determine the root device and, if instructed to, the root file system. 147 */ 148 149 #ifdef MEMORY_DISK_IS_ROOT 150 int md_is_root = 1; 151 #else 152 int md_is_root = 0; 153 #endif 154 155 /* 156 * The device and partition that we booted from. 157 */ 158 device_t booted_device; 159 int booted_partition; 160 daddr_t booted_startblk; 161 uint64_t booted_nblks; 162 163 /* 164 * Use partition letters if it's a disk class but not a wedge. 165 * XXX Check for wedge is kinda gross. 166 */ 167 #define DEV_USES_PARTITIONS(dv) \ 168 (device_class((dv)) == DV_DISK && \ 169 !device_is_a((dv), "dk")) 170 171 void 172 setroot(device_t bootdv, int bootpartition) 173 { 174 device_t dv; 175 deviter_t di; 176 int len, majdev; 177 dev_t nrootdev; 178 dev_t ndumpdev = NODEV; 179 char buf[128]; 180 const char *rootdevname; 181 const char *dumpdevname; 182 device_t rootdv = NULL; /* XXX gcc -Wuninitialized */ 183 device_t dumpdv = NULL; 184 struct ifnet *ifp; 185 const char *deffsname; 186 struct vfsops *vops; 187 188 #ifdef TFTPROOT 189 if (tftproot_dhcpboot(bootdv) != 0) 190 boothowto |= RB_ASKNAME; 191 #endif 192 193 /* 194 * For root on md0 we have to force the attachment of md0. 195 */ 196 if (md_is_root) { 197 int md_major; 198 dev_t md_dev; 199 200 bootdv = NULL; 201 md_major = devsw_name2blk("md", NULL, 0); 202 if (md_major >= 0) { 203 md_dev = MAKEDISKDEV(md_major, 0, RAW_PART); 204 if (bdev_open(md_dev, FREAD, S_IFBLK, curlwp) == 0) 205 bootdv = device_find_by_xname("md0"); 206 } 207 if (bootdv == NULL) 208 panic("Cannot open \"md0\" (root)"); 209 } 210 211 /* 212 * If NFS is specified as the file system, and we found 213 * a DV_DISK boot device (or no boot device at all), then 214 * find a reasonable network interface for "rootspec". 215 */ 216 vops = vfs_getopsbyname(MOUNT_NFS); 217 if (vops != NULL && strcmp(rootfstype, MOUNT_NFS) == 0 && 218 rootspec == NULL && 219 (bootdv == NULL || device_class(bootdv) != DV_IFNET)) { 220 IFNET_FOREACH(ifp) { 221 if ((ifp->if_flags & 222 (IFF_LOOPBACK|IFF_POINTOPOINT)) == 0) 223 break; 224 } 225 if (ifp == NULL) { 226 /* 227 * Can't find a suitable interface; ask the 228 * user. 229 */ 230 boothowto |= RB_ASKNAME; 231 } else { 232 /* 233 * Have a suitable interface; behave as if 234 * the user specified this interface. 235 */ 236 rootspec = (const char *)ifp->if_xname; 237 } 238 } 239 if (vops != NULL) 240 vfs_delref(vops); 241 242 /* 243 * If wildcarded root and we the boot device wasn't determined, 244 * ask the user. 245 */ 246 if (rootspec == NULL && bootdv == NULL) 247 boothowto |= RB_ASKNAME; 248 249 top: 250 if (boothowto & RB_ASKNAME) { 251 device_t defdumpdv; 252 253 for (;;) { 254 printf("root device"); 255 if (bootdv != NULL) { 256 printf(" (default %s", device_xname(bootdv)); 257 if (DEV_USES_PARTITIONS(bootdv)) 258 printf("%c", bootpartition + 'a'); 259 printf(")"); 260 } 261 printf(": "); 262 len = cngetsn(buf, sizeof(buf)); 263 if (len == 0 && bootdv != NULL) { 264 strlcpy(buf, device_xname(bootdv), sizeof(buf)); 265 len = strlen(buf); 266 } 267 if (len > 0 && buf[len - 1] == '*') { 268 buf[--len] = '\0'; 269 dv = getdisk(buf, len, 1, &nrootdev, 0); 270 if (dv != NULL) { 271 rootdv = dv; 272 break; 273 } 274 } 275 dv = getdisk(buf, len, bootpartition, &nrootdev, 0); 276 if (dv != NULL) { 277 rootdv = dv; 278 break; 279 } 280 } 281 282 /* 283 * Set up the default dump device. If root is on 284 * a network device, there is no default dump 285 * device, since we don't support dumps to the 286 * network. 287 */ 288 if (DEV_USES_PARTITIONS(rootdv) == 0) 289 defdumpdv = NULL; 290 else 291 defdumpdv = rootdv; 292 293 for (;;) { 294 printf("dump device"); 295 if (defdumpdv != NULL) { 296 /* 297 * Note, we know it's a disk if we get here. 298 */ 299 printf(" (default %sb)", device_xname(defdumpdv)); 300 } 301 printf(": "); 302 len = cngetsn(buf, sizeof(buf)); 303 if (len == 0) { 304 if (defdumpdv != NULL) { 305 ndumpdev = MAKEDISKDEV(major(nrootdev), 306 DISKUNIT(nrootdev), 1); 307 } 308 dumpdv = defdumpdv; 309 break; 310 } 311 if (len == 4 && strcmp(buf, "none") == 0) { 312 dumpdv = NULL; 313 break; 314 } 315 dv = getdisk(buf, len, 1, &ndumpdev, 1); 316 if (dv != NULL) { 317 dumpdv = dv; 318 break; 319 } 320 } 321 322 rootdev = nrootdev; 323 dumpdev = ndumpdev; 324 325 for (vops = LIST_FIRST(&vfs_list); vops != NULL; 326 vops = LIST_NEXT(vops, vfs_list)) { 327 if (vops->vfs_mountroot != NULL && 328 strcmp(rootfstype, vops->vfs_name) == 0) 329 break; 330 } 331 332 if (vops == NULL) { 333 deffsname = "generic"; 334 } else 335 deffsname = vops->vfs_name; 336 337 for (;;) { 338 printf("file system (default %s): ", deffsname); 339 len = cngetsn(buf, sizeof(buf)); 340 if (len == 0) { 341 if (strcmp(deffsname, "generic") == 0) 342 rootfstype = ROOT_FSTYPE_ANY; 343 break; 344 } 345 if (len == 4 && strcmp(buf, "halt") == 0) 346 cpu_reboot(RB_HALT, NULL); 347 else if (len == 6 && strcmp(buf, "reboot") == 0) 348 cpu_reboot(0, NULL); 349 #if defined(DDB) 350 else if (len == 3 && strcmp(buf, "ddb") == 0) { 351 console_debugger(); 352 } 353 #endif 354 else if (len == 7 && strcmp(buf, "generic") == 0) { 355 rootfstype = ROOT_FSTYPE_ANY; 356 break; 357 } 358 vops = vfs_getopsbyname(buf); 359 if (vops == NULL || vops->vfs_mountroot == NULL) { 360 printf("use one of: generic"); 361 for (vops = LIST_FIRST(&vfs_list); 362 vops != NULL; 363 vops = LIST_NEXT(vops, vfs_list)) { 364 if (vops->vfs_mountroot != NULL) 365 printf(" %s", vops->vfs_name); 366 } 367 if (vops != NULL) 368 vfs_delref(vops); 369 #if defined(DDB) 370 printf(" ddb"); 371 #endif 372 printf(" halt reboot\n"); 373 } else { 374 /* 375 * XXX If *vops gets freed between here and 376 * the call to mountroot(), rootfstype will 377 * point to something unexpected. But in 378 * this case the system will fail anyway. 379 */ 380 rootfstype = vops->vfs_name; 381 vfs_delref(vops); 382 break; 383 } 384 } 385 386 } else if (rootspec == NULL) { 387 /* 388 * Wildcarded root; use the boot device. 389 */ 390 rootdv = bootdv; 391 392 if (bootdv) 393 majdev = devsw_name2blk(device_xname(bootdv), NULL, 0); 394 else 395 majdev = -1; 396 if (majdev >= 0) { 397 /* 398 * Root is on a disk. `bootpartition' is root, 399 * unless the device does not use partitions. 400 */ 401 if (DEV_USES_PARTITIONS(bootdv)) 402 rootdev = MAKEDISKDEV(majdev, 403 device_unit(bootdv), 404 bootpartition); 405 else 406 rootdev = makedev(majdev, device_unit(bootdv)); 407 } 408 } else { 409 410 /* 411 * `root on <dev> ...' 412 */ 413 414 /* 415 * If it's a network interface, we can bail out 416 * early. 417 */ 418 dv = finddevice(rootspec); 419 if (dv != NULL && device_class(dv) == DV_IFNET) { 420 rootdv = dv; 421 goto haveroot; 422 } 423 424 if (rootdev == NODEV && 425 dv != NULL && device_class(dv) == DV_DISK && 426 device_is_a(dv, "dk") && 427 (majdev = devsw_name2blk(device_xname(dv), NULL, 0)) >= 0) 428 rootdev = makedev(majdev, device_unit(dv)); 429 430 rootdevname = devsw_blk2name(major(rootdev)); 431 if (rootdevname == NULL) { 432 printf("unknown device major 0x%llx\n", 433 (unsigned long long)rootdev); 434 boothowto |= RB_ASKNAME; 435 goto top; 436 } 437 memset(buf, 0, sizeof(buf)); 438 snprintf(buf, sizeof(buf), "%s%llu", rootdevname, 439 (unsigned long long)DISKUNIT(rootdev)); 440 441 rootdv = finddevice(buf); 442 if (rootdv == NULL) { 443 printf("device %s (0x%llx) not configured\n", 444 buf, (unsigned long long)rootdev); 445 boothowto |= RB_ASKNAME; 446 goto top; 447 } 448 } 449 450 haveroot: 451 452 root_device = rootdv; 453 454 switch (device_class(rootdv)) { 455 case DV_IFNET: 456 case DV_DISK: 457 aprint_normal("root on %s", device_xname(rootdv)); 458 if (DEV_USES_PARTITIONS(rootdv)) 459 aprint_normal("%c", (int)DISKPART(rootdev) + 'a'); 460 break; 461 462 default: 463 printf("can't determine root device\n"); 464 boothowto |= RB_ASKNAME; 465 goto top; 466 } 467 468 /* 469 * Now configure the dump device. 470 * 471 * If we haven't figured out the dump device, do so, with 472 * the following rules: 473 * 474 * (a) We already know dumpdv in the RB_ASKNAME case. 475 * 476 * (b) If dumpspec is set, try to use it. If the device 477 * is not available, punt. 478 * 479 * (c) If dumpspec is not set, the dump device is 480 * wildcarded or unspecified. If the root device 481 * is DV_IFNET, punt. Otherwise, use partition b 482 * of the root device. 483 */ 484 485 if (boothowto & RB_ASKNAME) { /* (a) */ 486 if (dumpdv == NULL) 487 goto nodumpdev; 488 } else if (dumpspec != NULL) { /* (b) */ 489 if (strcmp(dumpspec, "none") == 0 || dumpdev == NODEV) { 490 /* 491 * Operator doesn't want a dump device. 492 * Or looks like they tried to pick a network 493 * device. Oops. 494 */ 495 goto nodumpdev; 496 } 497 498 dumpdevname = devsw_blk2name(major(dumpdev)); 499 if (dumpdevname == NULL) 500 goto nodumpdev; 501 memset(buf, 0, sizeof(buf)); 502 snprintf(buf, sizeof(buf), "%s%llu", dumpdevname, 503 (unsigned long long)DISKUNIT(dumpdev)); 504 505 dumpdv = finddevice(buf); 506 if (dumpdv == NULL) { 507 /* 508 * Device not configured. 509 */ 510 goto nodumpdev; 511 } 512 } else { /* (c) */ 513 if (DEV_USES_PARTITIONS(rootdv) == 0) { 514 for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); 515 dv != NULL; 516 dv = deviter_next(&di)) 517 if (isswap(dv)) 518 break; 519 deviter_release(&di); 520 if (dv == NULL) 521 goto nodumpdev; 522 523 majdev = devsw_name2blk(device_xname(dv), NULL, 0); 524 if (majdev < 0) 525 goto nodumpdev; 526 dumpdv = dv; 527 dumpdev = makedev(majdev, device_unit(dumpdv)); 528 } else { 529 dumpdv = rootdv; 530 dumpdev = MAKEDISKDEV(major(rootdev), 531 device_unit(dumpdv), 1); 532 } 533 } 534 535 dumpcdev = devsw_blk2chr(dumpdev); 536 aprint_normal(" dumps on %s", device_xname(dumpdv)); 537 if (DEV_USES_PARTITIONS(dumpdv)) 538 aprint_normal("%c", (int)DISKPART(dumpdev) + 'a'); 539 aprint_normal("\n"); 540 return; 541 542 nodumpdev: 543 dumpdev = NODEV; 544 dumpcdev = NODEV; 545 aprint_normal("\n"); 546 } 547 548 static device_t 549 finddevice(const char *name) 550 { 551 const char *wname; 552 553 if ((wname = getwedgename(name, strlen(name))) != NULL) 554 return dkwedge_find_by_wname(wname); 555 556 return device_find_by_xname(name); 557 } 558 559 static device_t 560 getdisk(char *str, int len, int defpart, dev_t *devp, int isdump) 561 { 562 device_t dv; 563 deviter_t di; 564 565 if ((dv = parsedisk(str, len, defpart, devp)) == NULL) { 566 printf("use one of:"); 567 for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); dv != NULL; 568 dv = deviter_next(&di)) { 569 if (DEV_USES_PARTITIONS(dv)) 570 printf(" %s[a-%c]", device_xname(dv), 571 'a' + MAXPARTITIONS - 1); 572 else if (device_class(dv) == DV_DISK) 573 printf(" %s", device_xname(dv)); 574 if (isdump == 0 && device_class(dv) == DV_IFNET) 575 printf(" %s", device_xname(dv)); 576 } 577 deviter_release(&di); 578 dkwedge_print_wnames(); 579 if (isdump) 580 printf(" none"); 581 #if defined(DDB) 582 printf(" ddb"); 583 #endif 584 printf(" halt reboot\n"); 585 } 586 return dv; 587 } 588 589 static const char * 590 getwedgename(const char *name, int namelen) 591 { 592 const char *wpfx = "wedge:"; 593 const int wpfxlen = strlen(wpfx); 594 595 if (namelen < wpfxlen || strncmp(name, wpfx, wpfxlen) != 0) 596 return NULL; 597 598 return name + wpfxlen; 599 } 600 601 static device_t 602 parsedisk(char *str, int len, int defpart, dev_t *devp) 603 { 604 device_t dv; 605 const char *wname; 606 char *cp, c; 607 int majdev, part; 608 if (len == 0) 609 return (NULL); 610 611 if (len == 4 && strcmp(str, "halt") == 0) 612 cpu_reboot(RB_HALT, NULL); 613 else if (len == 6 && strcmp(str, "reboot") == 0) 614 cpu_reboot(0, NULL); 615 #if defined(DDB) 616 else if (len == 3 && strcmp(str, "ddb") == 0) 617 console_debugger(); 618 #endif 619 620 cp = str + len - 1; 621 c = *cp; 622 623 if ((wname = getwedgename(str, len)) != NULL) { 624 if ((dv = dkwedge_find_by_wname(wname)) == NULL) 625 return NULL; 626 part = defpart; 627 goto gotdisk; 628 } else if (c >= 'a' && c <= ('a' + MAXPARTITIONS - 1)) { 629 part = c - 'a'; 630 *cp = '\0'; 631 } else 632 part = defpart; 633 634 dv = finddevice(str); 635 if (dv != NULL) { 636 if (device_class(dv) == DV_DISK) { 637 gotdisk: 638 majdev = devsw_name2blk(device_xname(dv), NULL, 0); 639 if (majdev < 0) 640 panic("parsedisk"); 641 if (DEV_USES_PARTITIONS(dv)) 642 *devp = MAKEDISKDEV(majdev, device_unit(dv), 643 part); 644 else 645 *devp = makedev(majdev, device_unit(dv)); 646 } 647 648 if (device_class(dv) == DV_IFNET) 649 *devp = NODEV; 650 } 651 652 *cp = c; 653 return (dv); 654 } 655
Indexes created Mon Sep 22 13:09:51 GMT 2025