1 /* $NetBSD: kern_subr.c,v 1.217 2016/05/12 02:24:16 ozaki-r 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 1.217 2016/05/12 02:24:16 ozaki-r 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 char *bootspec; 163 164 /* 165 * Use partition letters if it's a disk class but not a wedge. 166 * XXX Check for wedge is kinda gross. 167 */ 168 #define DEV_USES_PARTITIONS(dv) \ 169 (device_class((dv)) == DV_DISK && \ 170 !device_is_a((dv), "dk")) 171 172 void 173 setroot(device_t bootdv, int bootpartition) 174 { 175 device_t dv; 176 deviter_t di; 177 int len, majdev; 178 dev_t nrootdev; 179 dev_t ndumpdev = NODEV; 180 char buf[128]; 181 const char *rootdevname; 182 const char *dumpdevname; 183 device_t rootdv = NULL; /* XXX gcc -Wuninitialized */ 184 device_t dumpdv = NULL; 185 struct ifnet *ifp; 186 const char *deffsname; 187 struct vfsops *vops; 188 189 #ifdef TFTPROOT 190 if (tftproot_dhcpboot(bootdv) != 0) 191 boothowto |= RB_ASKNAME; 192 #endif 193 194 /* 195 * For root on md0 we have to force the attachment of md0. 196 */ 197 if (md_is_root) { 198 int md_major; 199 dev_t md_dev; 200 201 bootdv = NULL; 202 md_major = devsw_name2blk("md", NULL, 0); 203 if (md_major >= 0) { 204 md_dev = MAKEDISKDEV(md_major, 0, RAW_PART); 205 if (bdev_open(md_dev, FREAD, S_IFBLK, curlwp) == 0) 206 bootdv = device_find_by_xname("md0"); 207 } 208 if (bootdv == NULL) 209 panic("Cannot open \"md0\" (root)"); 210 } 211 212 /* 213 * Let bootcode augment "rootspec". 214 */ 215 if (rootspec == NULL) 216 rootspec = bootspec; 217 218 /* 219 * If NFS is specified as the file system, and we found 220 * a DV_DISK boot device (or no boot device at all), then 221 * find a reasonable network interface for "rootspec". 222 */ 223 vops = vfs_getopsbyname(MOUNT_NFS); 224 if (vops != NULL && strcmp(rootfstype, MOUNT_NFS) == 0 && 225 rootspec == NULL && 226 (bootdv == NULL || device_class(bootdv) != DV_IFNET)) { 227 int s = pserialize_read_enter(); 228 IFNET_READER_FOREACH(ifp) { 229 if ((ifp->if_flags & 230 (IFF_LOOPBACK|IFF_POINTOPOINT)) == 0) 231 break; 232 } 233 if (ifp == NULL) { 234 /* 235 * Can't find a suitable interface; ask the 236 * user. 237 */ 238 boothowto |= RB_ASKNAME; 239 } else { 240 /* 241 * Have a suitable interface; behave as if 242 * the user specified this interface. 243 */ 244 rootspec = (const char *)ifp->if_xname; 245 } 246 pserialize_read_exit(s); 247 } 248 if (vops != NULL) 249 vfs_delref(vops); 250 251 /* 252 * If wildcarded root and we the boot device wasn't determined, 253 * ask the user. 254 */ 255 if (rootspec == NULL && bootdv == NULL) 256 boothowto |= RB_ASKNAME; 257 258 top: 259 if (boothowto & RB_ASKNAME) { 260 device_t defdumpdv; 261 262 for (;;) { 263 printf("root device"); 264 if (bootdv != NULL) { 265 printf(" (default %s", device_xname(bootdv)); 266 if (DEV_USES_PARTITIONS(bootdv)) 267 printf("%c", bootpartition + 'a'); 268 printf(")"); 269 } 270 printf(": "); 271 len = cngetsn(buf, sizeof(buf)); 272 if (len == 0 && bootdv != NULL) { 273 strlcpy(buf, device_xname(bootdv), sizeof(buf)); 274 len = strlen(buf); 275 } 276 if (len > 0 && buf[len - 1] == '*') { 277 buf[--len] = '\0'; 278 dv = getdisk(buf, len, 1, &nrootdev, 0); 279 if (dv != NULL) { 280 rootdv = dv; 281 break; 282 } 283 } 284 dv = getdisk(buf, len, bootpartition, &nrootdev, 0); 285 if (dv != NULL) { 286 rootdv = dv; 287 break; 288 } 289 } 290 291 /* 292 * Set up the default dump device. If root is on 293 * a network device, there is no default dump 294 * device, since we don't support dumps to the 295 * network. 296 */ 297 if (DEV_USES_PARTITIONS(rootdv) == 0) 298 defdumpdv = NULL; 299 else 300 defdumpdv = rootdv; 301 302 for (;;) { 303 printf("dump device"); 304 if (defdumpdv != NULL) { 305 /* 306 * Note, we know it's a disk if we get here. 307 */ 308 printf(" (default %sb)", device_xname(defdumpdv)); 309 } 310 printf(": "); 311 len = cngetsn(buf, sizeof(buf)); 312 if (len == 0) { 313 if (defdumpdv != NULL) { 314 ndumpdev = MAKEDISKDEV(major(nrootdev), 315 DISKUNIT(nrootdev), 1); 316 } 317 dumpdv = defdumpdv; 318 break; 319 } 320 if (len == 4 && strcmp(buf, "none") == 0) { 321 dumpdv = NULL; 322 break; 323 } 324 dv = getdisk(buf, len, 1, &ndumpdev, 1); 325 if (dv != NULL) { 326 dumpdv = dv; 327 break; 328 } 329 } 330 331 rootdev = nrootdev; 332 dumpdev = ndumpdev; 333 334 for (vops = LIST_FIRST(&vfs_list); vops != NULL; 335 vops = LIST_NEXT(vops, vfs_list)) { 336 if (vops->vfs_mountroot != NULL && 337 strcmp(rootfstype, vops->vfs_name) == 0) 338 break; 339 } 340 341 if (vops == NULL) { 342 deffsname = "generic"; 343 } else 344 deffsname = vops->vfs_name; 345 346 for (;;) { 347 printf("file system (default %s): ", deffsname); 348 len = cngetsn(buf, sizeof(buf)); 349 if (len == 0) { 350 if (strcmp(deffsname, "generic") == 0) 351 rootfstype = ROOT_FSTYPE_ANY; 352 break; 353 } 354 if (len == 4 && strcmp(buf, "halt") == 0) 355 cpu_reboot(RB_HALT, NULL); 356 else if (len == 6 && strcmp(buf, "reboot") == 0) 357 cpu_reboot(0, NULL); 358 #if defined(DDB) 359 else if (len == 3 && strcmp(buf, "ddb") == 0) { 360 console_debugger(); 361 } 362 #endif 363 else if (len == 7 && strcmp(buf, "generic") == 0) { 364 rootfstype = ROOT_FSTYPE_ANY; 365 break; 366 } 367 vops = vfs_getopsbyname(buf); 368 if (vops == NULL || vops->vfs_mountroot == NULL) { 369 printf("use one of: generic"); 370 for (vops = LIST_FIRST(&vfs_list); 371 vops != NULL; 372 vops = LIST_NEXT(vops, vfs_list)) { 373 if (vops->vfs_mountroot != NULL) 374 printf(" %s", vops->vfs_name); 375 } 376 if (vops != NULL) 377 vfs_delref(vops); 378 #if defined(DDB) 379 printf(" ddb"); 380 #endif 381 printf(" halt reboot\n"); 382 } else { 383 /* 384 * XXX If *vops gets freed between here and 385 * the call to mountroot(), rootfstype will 386 * point to something unexpected. But in 387 * this case the system will fail anyway. 388 */ 389 rootfstype = vops->vfs_name; 390 vfs_delref(vops); 391 break; 392 } 393 } 394 395 } else if (rootspec == NULL) { 396 /* 397 * Wildcarded root; use the boot device. 398 */ 399 rootdv = bootdv; 400 401 if (bootdv) 402 majdev = devsw_name2blk(device_xname(bootdv), NULL, 0); 403 else 404 majdev = -1; 405 if (majdev >= 0) { 406 /* 407 * Root is on a disk. `bootpartition' is root, 408 * unless the device does not use partitions. 409 */ 410 if (DEV_USES_PARTITIONS(bootdv)) 411 rootdev = MAKEDISKDEV(majdev, 412 device_unit(bootdv), 413 bootpartition); 414 else 415 rootdev = makedev(majdev, device_unit(bootdv)); 416 } 417 } else { 418 419 /* 420 * `root on <dev> ...' 421 */ 422 423 /* 424 * If it's a network interface, we can bail out 425 * early. 426 */ 427 dv = finddevice(rootspec); 428 if (dv != NULL && device_class(dv) == DV_IFNET) { 429 rootdv = dv; 430 goto haveroot; 431 } 432 433 if (rootdev == NODEV && 434 dv != NULL && device_class(dv) == DV_DISK && 435 device_is_a(dv, "dk") && 436 (majdev = devsw_name2blk(device_xname(dv), NULL, 0)) >= 0) 437 rootdev = makedev(majdev, device_unit(dv)); 438 439 rootdevname = devsw_blk2name(major(rootdev)); 440 if (rootdevname == NULL) { 441 printf("unknown device major 0x%llx\n", 442 (unsigned long long)rootdev); 443 boothowto |= RB_ASKNAME; 444 goto top; 445 } 446 memset(buf, 0, sizeof(buf)); 447 snprintf(buf, sizeof(buf), "%s%llu", rootdevname, 448 (unsigned long long)DISKUNIT(rootdev)); 449 450 rootdv = finddevice(buf); 451 if (rootdv == NULL) { 452 printf("device %s (0x%llx) not configured\n", 453 buf, (unsigned long long)rootdev); 454 boothowto |= RB_ASKNAME; 455 goto top; 456 } 457 } 458 459 haveroot: 460 461 root_device = rootdv; 462 463 switch (device_class(rootdv)) { 464 case DV_IFNET: 465 case DV_DISK: 466 aprint_normal("root on %s", device_xname(rootdv)); 467 if (DEV_USES_PARTITIONS(rootdv)) 468 aprint_normal("%c", (int)DISKPART(rootdev) + 'a'); 469 break; 470 471 default: 472 printf("can't determine root device\n"); 473 boothowto |= RB_ASKNAME; 474 goto top; 475 } 476 477 /* 478 * Now configure the dump device. 479 * 480 * If we haven't figured out the dump device, do so, with 481 * the following rules: 482 * 483 * (a) We already know dumpdv in the RB_ASKNAME case. 484 * 485 * (b) If dumpspec is set, try to use it. If the device 486 * is not available, punt. 487 * 488 * (c) If dumpspec is not set, the dump device is 489 * wildcarded or unspecified. If the root device 490 * is DV_IFNET, punt. Otherwise, use partition b 491 * of the root device. 492 */ 493 494 if (boothowto & RB_ASKNAME) { /* (a) */ 495 if (dumpdv == NULL) 496 goto nodumpdev; 497 } else if (dumpspec != NULL) { /* (b) */ 498 if (strcmp(dumpspec, "none") == 0 || dumpdev == NODEV) { 499 /* 500 * Operator doesn't want a dump device. 501 * Or looks like they tried to pick a network 502 * device. Oops. 503 */ 504 goto nodumpdev; 505 } 506 507 dumpdevname = devsw_blk2name(major(dumpdev)); 508 if (dumpdevname == NULL) 509 goto nodumpdev; 510 memset(buf, 0, sizeof(buf)); 511 snprintf(buf, sizeof(buf), "%s%llu", dumpdevname, 512 (unsigned long long)DISKUNIT(dumpdev)); 513 514 dumpdv = finddevice(buf); 515 if (dumpdv == NULL) { 516 /* 517 * Device not configured. 518 */ 519 goto nodumpdev; 520 } 521 } else { /* (c) */ 522 if (DEV_USES_PARTITIONS(rootdv) == 0) { 523 for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); 524 dv != NULL; 525 dv = deviter_next(&di)) 526 if (isswap(dv)) 527 break; 528 deviter_release(&di); 529 if (dv == NULL) 530 goto nodumpdev; 531 532 majdev = devsw_name2blk(device_xname(dv), NULL, 0); 533 if (majdev < 0) 534 goto nodumpdev; 535 dumpdv = dv; 536 dumpdev = makedev(majdev, device_unit(dumpdv)); 537 } else { 538 dumpdv = rootdv; 539 dumpdev = MAKEDISKDEV(major(rootdev), 540 device_unit(dumpdv), 1); 541 } 542 } 543 544 dumpcdev = devsw_blk2chr(dumpdev); 545 aprint_normal(" dumps on %s", device_xname(dumpdv)); 546 if (DEV_USES_PARTITIONS(dumpdv)) 547 aprint_normal("%c", (int)DISKPART(dumpdev) + 'a'); 548 aprint_normal("\n"); 549 return; 550 551 nodumpdev: 552 dumpdev = NODEV; 553 dumpcdev = NODEV; 554 aprint_normal("\n"); 555 } 556 557 static device_t 558 finddevice(const char *name) 559 { 560 const char *wname; 561 562 if ((wname = getwedgename(name, strlen(name))) != NULL) 563 return dkwedge_find_by_wname(wname); 564 565 return device_find_by_xname(name); 566 } 567 568 static device_t 569 getdisk(char *str, int len, int defpart, dev_t *devp, int isdump) 570 { 571 device_t dv; 572 deviter_t di; 573 574 if ((dv = parsedisk(str, len, defpart, devp)) == NULL) { 575 printf("use one of:"); 576 for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); dv != NULL; 577 dv = deviter_next(&di)) { 578 if (DEV_USES_PARTITIONS(dv)) 579 printf(" %s[a-%c]", device_xname(dv), 580 'a' + MAXPARTITIONS - 1); 581 else if (device_class(dv) == DV_DISK) 582 printf(" %s", device_xname(dv)); 583 if (isdump == 0 && device_class(dv) == DV_IFNET) 584 printf(" %s", device_xname(dv)); 585 } 586 deviter_release(&di); 587 dkwedge_print_wnames(); 588 if (isdump) 589 printf(" none"); 590 #if defined(DDB) 591 printf(" ddb"); 592 #endif 593 printf(" halt reboot\n"); 594 } 595 return dv; 596 } 597 598 static const char * 599 getwedgename(const char *name, int namelen) 600 { 601 const char *wpfx = "wedge:"; 602 const int wpfxlen = strlen(wpfx); 603 604 if (namelen < wpfxlen || strncmp(name, wpfx, wpfxlen) != 0) 605 return NULL; 606 607 return name + wpfxlen; 608 } 609 610 static device_t 611 parsedisk(char *str, int len, int defpart, dev_t *devp) 612 { 613 device_t dv; 614 const char *wname; 615 char *cp, c; 616 int majdev, part; 617 if (len == 0) 618 return (NULL); 619 620 if (len == 4 && strcmp(str, "halt") == 0) 621 cpu_reboot(RB_HALT, NULL); 622 else if (len == 6 && strcmp(str, "reboot") == 0) 623 cpu_reboot(0, NULL); 624 #if defined(DDB) 625 else if (len == 3 && strcmp(str, "ddb") == 0) 626 console_debugger(); 627 #endif 628 629 cp = str + len - 1; 630 c = *cp; 631 632 if ((wname = getwedgename(str, len)) != NULL) { 633 if ((dv = dkwedge_find_by_wname(wname)) == NULL) 634 return NULL; 635 part = defpart; 636 goto gotdisk; 637 } else if (c >= 'a' && c <= ('a' + MAXPARTITIONS - 1)) { 638 part = c - 'a'; 639 *cp = '\0'; 640 } else 641 part = defpart; 642 643 dv = finddevice(str); 644 if (dv != NULL) { 645 if (device_class(dv) == DV_DISK) { 646 gotdisk: 647 majdev = devsw_name2blk(device_xname(dv), NULL, 0); 648 if (majdev < 0) 649 panic("parsedisk"); 650 if (DEV_USES_PARTITIONS(dv)) 651 *devp = MAKEDISKDEV(majdev, device_unit(dv), 652 part); 653 else 654 *devp = makedev(majdev, device_unit(dv)); 655 } 656 657 if (device_class(dv) == DV_IFNET) 658 *devp = NODEV; 659 } 660 661 *cp = c; 662 return (dv); 663 } 664