Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_subr.c
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1 /* $NetBSD: kern_subr.c,v 1.231 2023/01/19 07:40:58 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 1.231 2023/01/19 07:40:58 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(const char *, int, int, dev_t *, int); 111 static device_t parsedisk(const char *, int, int, dev_t *); 112 static const char *getwedgename(const char *, int); 113 114 static void setroot_nfs(device_t); 115 static void setroot_md(device_t *); 116 static void setroot_ask(device_t, int); 117 static void setroot_root(device_t, int); 118 static void setroot_dump(device_t, device_t); 119 120 121 #ifdef TFTPROOT 122 int tftproot_dhcpboot(device_t); 123 #endif 124 125 dev_t dumpcdev; /* for savecore */ 126 127 static int 128 isswap(device_t dv) 129 { 130 struct dkwedge_info wi; 131 struct vnode *vn; 132 int error; 133 134 if (device_class(dv) != DV_DISK || !device_is_a(dv, "dk")) 135 return 0; 136 137 if ((vn = opendisk(dv)) == NULL) 138 return 0; 139 140 VOP_UNLOCK(vn); 141 error = VOP_IOCTL(vn, DIOCGWEDGEINFO, &wi, FREAD, NOCRED); 142 vn_lock(vn, LK_EXCLUSIVE | LK_RETRY); 143 VOP_CLOSE(vn, FREAD, NOCRED); 144 vput(vn); 145 if (error) { 146 #ifdef DEBUG_WEDGE 147 printf("%s: Get wedge info returned %d\n", device_xname(dv), error); 148 #endif 149 return 0; 150 } 151 return strcmp(wi.dkw_ptype, DKW_PTYPE_SWAP) == 0; 152 } 153 154 /* 155 * Determine the root device and, if instructed to, the root file system. 156 */ 157 158 #ifdef MEMORY_DISK_IS_ROOT 159 int md_is_root = 1; 160 #else 161 int md_is_root = 0; 162 #endif 163 164 /* 165 * The device and partition that we booted from. 166 * 167 * This data might be initialized by MD code, but is defined here. 168 */ 169 device_t booted_device; 170 const char *booted_method; 171 int booted_partition; 172 daddr_t booted_startblk; 173 uint64_t booted_nblks; 174 char *bootspec; 175 176 /* 177 * Time to wait for a specified boot device to appear. 178 */ 179 #ifndef ROOT_WAITTIME 180 #define ROOT_WAITTIME 20 181 #endif 182 183 /* 184 * Use partition letters if it's a disk class but not a wedge or flash. 185 * XXX Check for wedge/flash is kinda gross. 186 */ 187 #define DEV_USES_PARTITIONS(dv) \ 188 (device_class((dv)) == DV_DISK && \ 189 !device_is_a((dv), "dk") && \ 190 !device_is_a((dv), "flash")) 191 192 void 193 setroot(device_t bootdv, int bootpartition) 194 { 195 time_t waitend; 196 197 /* 198 * Let bootcode augment "rootspec", ensure that 199 * rootdev is invalid to avoid confusion. 200 */ 201 if (rootspec == NULL) { 202 rootspec = bootspec; 203 rootdev = NODEV; 204 } 205 206 /* 207 * force boot device to md0 208 */ 209 if (md_is_root) 210 setroot_md(&bootdv); 211 212 #ifdef TFTPROOT 213 /* 214 * XXX 215 * if rootspec specifies an interface 216 * sets root_device to that interface 217 * reuses NFS init code to set up network 218 * fetch image into ram disk 219 * 220 * if successful, we change boot device 221 */ 222 if (tftproot_dhcpboot(bootdv) == 0) 223 setroot_md(&bootdv); 224 #endif 225 226 /* 227 * quirk for 228 * evbarm/mini2440 229 * hpcarm 230 * hpcmips 231 * hpcsh 232 * 233 * if rootfstype is set to NFS and the 234 * kernel supports NFS and the boot device 235 * is unknown or not a network interface 236 * -> chose the first network interface you find 237 * 238 * hp300 has similar MD code 239 */ 240 setroot_nfs(bootdv); 241 242 /* 243 * If no bootdv was found by MD code and no 244 * root specified ask the user. 245 */ 246 if (rootspec == NULL && bootdv == NULL) 247 boothowto |= RB_ASKNAME; 248 249 /* 250 * loop until a root device is specified 251 */ 252 waitend = time_uptime + ROOT_WAITTIME; 253 do { 254 if (boothowto & RB_ASKNAME) 255 setroot_ask(bootdv, bootpartition); 256 else { 257 setroot_root(bootdv, bootpartition); 258 if (root_device == NULL) { 259 if (time_uptime < waitend) { 260 kpause("root", false, hz, NULL); 261 } else 262 boothowto |= RB_ASKNAME; 263 } 264 } 265 } while (root_device == NULL); 266 } 267 268 /* 269 * If NFS is specified as the file system, and we found 270 * a DV_DISK boot device (or no boot device at all), then 271 * find a reasonable network interface for "rootspec". 272 */ 273 static void 274 setroot_nfs(device_t dv) 275 { 276 struct vfsops *vops; 277 struct ifnet *ifp; 278 279 vops = vfs_getopsbyname(MOUNT_NFS); 280 if (vops != NULL && strcmp(rootfstype, MOUNT_NFS) == 0 && 281 rootspec == NULL && 282 (dv == NULL || device_class(dv) != DV_IFNET)) { 283 int s = pserialize_read_enter(); 284 IFNET_READER_FOREACH(ifp) { 285 if ((ifp->if_flags & 286 (IFF_LOOPBACK|IFF_POINTOPOINT)) == 0) 287 break; 288 } 289 if (ifp != NULL) { 290 /* 291 * Have a suitable interface; behave as if 292 * the user specified this interface. 293 */ 294 rootspec = (const char *)ifp->if_xname; 295 } 296 pserialize_read_exit(s); 297 } 298 if (vops != NULL) 299 vfs_delref(vops); 300 } 301 302 /* 303 * Change boot device to md0 304 * 305 * md0 only exists when it is opened once. 306 */ 307 static void 308 setroot_md(device_t *dvp) 309 { 310 int md_major; 311 dev_t md_dev; 312 313 md_major = devsw_name2blk("md", NULL, 0); 314 if (md_major >= 0) { 315 md_dev = MAKEDISKDEV(md_major, 0, RAW_PART); 316 if (bdev_open(md_dev, FREAD, S_IFBLK, curlwp) == 0) 317 *dvp = device_find_by_xname("md0"); 318 } 319 } 320 321 static void 322 setroot_ask(device_t bootdv, int bootpartition) 323 { 324 device_t dv, defdumpdv, rootdv, dumpdv; 325 dev_t nrootdev, ndumpdev; 326 struct vfsops *vops; 327 const char *deffsname; 328 int len; 329 char buf[128]; 330 331 for (;;) { 332 printf("root device"); 333 if (bootdv != NULL) { 334 printf(" (default %s", device_xname(bootdv)); 335 if (DEV_USES_PARTITIONS(bootdv)) 336 printf("%c", bootpartition + 'a'); 337 printf(")"); 338 } 339 printf(": "); 340 len = cngetsn(buf, sizeof(buf)); 341 if (len == 0 && bootdv != NULL) { 342 strlcpy(buf, device_xname(bootdv), sizeof(buf)); 343 len = strlen(buf); 344 } 345 if (len > 0 && buf[len - 1] == '*') { 346 buf[--len] = '\0'; 347 dv = getdisk(buf, len, 1, &nrootdev, 0); 348 if (dv != NULL) { 349 rootdv = dv; 350 break; 351 } 352 } 353 dv = getdisk(buf, len, bootpartition, &nrootdev, 0); 354 if (dv != NULL) { 355 rootdv = dv; 356 break; 357 } 358 } 359 rootdev = nrootdev; 360 361 /* 362 * Set up the default dump device. If root is on 363 * a network device or a disk without partitions, 364 * there is no default dump device. 365 */ 366 if (DEV_USES_PARTITIONS(rootdv) == 0) 367 defdumpdv = NULL; 368 else 369 defdumpdv = rootdv; 370 371 ndumpdev = NODEV; 372 for (;;) { 373 printf("dump device"); 374 if (defdumpdv != NULL) { 375 /* 376 * Note, we know it's a disk if we get here. 377 */ 378 printf(" (default %sb)", device_xname(defdumpdv)); 379 } 380 printf(": "); 381 len = cngetsn(buf, sizeof(buf)); 382 if (len == 0) { 383 if (defdumpdv != NULL) { 384 ndumpdev = MAKEDISKDEV(major(nrootdev), 385 DISKUNIT(nrootdev), 1); 386 } 387 dumpdv = defdumpdv; 388 break; 389 } 390 if (len == 4 && strcmp(buf, "none") == 0) { 391 dumpdv = NULL; 392 break; 393 } 394 dv = getdisk(buf, len, 1, &ndumpdev, 1); 395 if (dv != NULL) { 396 dumpdv = dv; 397 break; 398 } 399 } 400 dumpdev = ndumpdev; 401 402 for (vops = LIST_FIRST(&vfs_list); vops != NULL; 403 vops = LIST_NEXT(vops, vfs_list)) { 404 if (vops->vfs_mountroot != NULL && 405 strcmp(rootfstype, vops->vfs_name) == 0) 406 break; 407 } 408 409 if (vops == NULL) { 410 deffsname = "generic"; 411 } else 412 deffsname = vops->vfs_name; 413 414 for (;;) { 415 printf("file system (default %s): ", deffsname); 416 len = cngetsn(buf, sizeof(buf)); 417 if (len == 0) { 418 if (strcmp(deffsname, "generic") == 0) 419 rootfstype = ROOT_FSTYPE_ANY; 420 break; 421 } 422 if (len == 4 && strcmp(buf, "halt") == 0) 423 kern_reboot(RB_HALT, NULL); 424 else if (len == 6 && strcmp(buf, "reboot") == 0) 425 kern_reboot(0, NULL); 426 #if defined(DDB) 427 else if (len == 3 && strcmp(buf, "ddb") == 0) { 428 console_debugger(); 429 } 430 #endif 431 else if (len == 7 && strcmp(buf, "generic") == 0) { 432 rootfstype = ROOT_FSTYPE_ANY; 433 break; 434 } 435 vops = vfs_getopsbyname(buf); 436 if (vops == NULL || vops->vfs_mountroot == NULL) { 437 printf("use one of: generic"); 438 for (vops = LIST_FIRST(&vfs_list); 439 vops != NULL; 440 vops = LIST_NEXT(vops, vfs_list)) { 441 if (vops->vfs_mountroot != NULL) 442 printf(" %s", vops->vfs_name); 443 } 444 if (vops != NULL) 445 vfs_delref(vops); 446 #if defined(DDB) 447 printf(" ddb"); 448 #endif 449 printf(" halt reboot\n"); 450 } else { 451 /* 452 * XXX If *vops gets freed between here and 453 * the call to mountroot(), rootfstype will 454 * point to something unexpected. But in 455 * this case the system will fail anyway. 456 */ 457 rootfstype = vops->vfs_name; 458 vfs_delref(vops); 459 break; 460 } 461 } 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 default: 471 printf("can't determine root device\n"); 472 return; 473 } 474 475 root_device = rootdv; 476 setroot_dump(rootdv, dumpdv); 477 } 478 479 /* 480 * configure 481 * device_t root_device 482 * dev_t rootdev (for disks) 483 * 484 */ 485 static void 486 setroot_root(device_t bootdv, int bootpartition) 487 { 488 device_t rootdv; 489 int majdev; 490 const char *rootdevname; 491 char buf[128]; 492 dev_t nrootdev; 493 494 if (rootspec == NULL) { 495 496 /* 497 * Wildcarded root; use the boot device. 498 */ 499 rootdv = bootdv; 500 501 if (bootdv) 502 majdev = devsw_name2blk(device_xname(bootdv), NULL, 0); 503 else 504 majdev = -1; 505 if (majdev >= 0) { 506 /* 507 * Root is on a disk. `bootpartition' is root, 508 * unless the device does not use partitions. 509 */ 510 if (DEV_USES_PARTITIONS(bootdv)) 511 rootdev = MAKEDISKDEV(majdev, 512 device_unit(bootdv), 513 bootpartition); 514 else 515 rootdev = makedev(majdev, device_unit(bootdv)); 516 } 517 } else { 518 519 /* 520 * `root on <dev> ...' 521 */ 522 523 /* 524 * If rootspec can be parsed, just use it. 525 */ 526 rootdv = parsedisk(rootspec, strlen(rootspec), 0, &nrootdev); 527 if (rootdv != NULL) { 528 rootdev = nrootdev; 529 goto haveroot; 530 } 531 532 /* 533 * Fall back to rootdev, compute rootdv for it 534 */ 535 rootdevname = devsw_blk2name(major(rootdev)); 536 if (rootdevname == NULL) { 537 printf("unknown device major 0x%llx\n", 538 (unsigned long long)rootdev); 539 return; 540 } 541 memset(buf, 0, sizeof(buf)); 542 snprintf(buf, sizeof(buf), "%s%llu", rootdevname, 543 (unsigned long long)DISKUNIT(rootdev)); 544 545 rootdv = finddevice(buf); 546 if (rootdv == NULL) { 547 printf("device %s (0x%llx) not configured\n", 548 buf, (unsigned long long)rootdev); 549 return; 550 } 551 } 552 553 haveroot: 554 switch (device_class(rootdv)) { 555 case DV_IFNET: 556 case DV_DISK: 557 aprint_normal("root on %s", device_xname(rootdv)); 558 if (DEV_USES_PARTITIONS(rootdv)) 559 aprint_normal("%c", (int)DISKPART(rootdev) + 'a'); 560 break; 561 default: 562 printf("can't determine root device\n"); 563 return; 564 } 565 566 root_device = rootdv; 567 setroot_dump(rootdv, NULL); 568 } 569 570 /* 571 * configure 572 * dev_t dumpdev 573 * dev_t dumpcdev 574 * 575 * set to NODEV if device not found 576 */ 577 static void 578 setroot_dump(device_t rootdv, device_t dumpdv) 579 { 580 device_t dv; 581 deviter_t di; 582 const char *dumpdevname; 583 int majdev; 584 char buf[128]; 585 586 /* 587 * Now configure the dump device. 588 * 589 * If we haven't figured out the dump device, do so, with 590 * the following rules: 591 * 592 * (a) We already know dumpdv in the RB_ASKNAME case. 593 * 594 * (b) If dumpspec is set, try to use it. If the device 595 * is not available, punt. 596 * 597 * (c) If dumpspec is not set, the dump device is 598 * wildcarded or unspecified. If the root device 599 * is DV_IFNET, punt. Otherwise, use partition b 600 * of the root device. 601 */ 602 603 if (boothowto & RB_ASKNAME) { /* (a) */ 604 if (dumpdv == NULL) 605 goto nodumpdev; 606 } else if (dumpspec != NULL) { /* (b) */ 607 if (strcmp(dumpspec, "none") == 0 || dumpdev == NODEV) { 608 /* 609 * Operator doesn't want a dump device. 610 * Or looks like they tried to pick a network 611 * device. Oops. 612 */ 613 goto nodumpdev; 614 } 615 616 dumpdevname = devsw_blk2name(major(dumpdev)); 617 if (dumpdevname == NULL) 618 goto nodumpdev; 619 memset(buf, 0, sizeof(buf)); 620 snprintf(buf, sizeof(buf), "%s%llu", dumpdevname, 621 (unsigned long long)DISKUNIT(dumpdev)); 622 623 dumpdv = finddevice(buf); 624 if (dumpdv == NULL) { 625 /* 626 * Device not configured. 627 */ 628 goto nodumpdev; 629 } 630 } else { /* (c) */ 631 if (DEV_USES_PARTITIONS(rootdv) == 0) { 632 for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); 633 dv != NULL; 634 dv = deviter_next(&di)) 635 if (isswap(dv)) 636 break; 637 deviter_release(&di); 638 if (dv == NULL) 639 goto nodumpdev; 640 641 majdev = devsw_name2blk(device_xname(dv), NULL, 0); 642 if (majdev < 0) 643 goto nodumpdev; 644 dumpdv = dv; 645 dumpdev = makedev(majdev, device_unit(dumpdv)); 646 } else { 647 dumpdv = rootdv; 648 dumpdev = MAKEDISKDEV(major(rootdev), 649 device_unit(dumpdv), 1); 650 } 651 } 652 653 dumpcdev = devsw_blk2chr(dumpdev); 654 aprint_normal(" dumps on %s", device_xname(dumpdv)); 655 if (DEV_USES_PARTITIONS(dumpdv)) 656 aprint_normal("%c", (int)DISKPART(dumpdev) + 'a'); 657 aprint_normal("\n"); 658 return; 659 660 nodumpdev: 661 dumpdev = NODEV; 662 dumpcdev = NODEV; 663 aprint_normal("\n"); 664 } 665 666 static device_t 667 finddevice(const char *name) 668 { 669 const char *wname; 670 671 if ((wname = getwedgename(name, strlen(name))) != NULL) 672 return dkwedge_find_by_wname(wname); 673 674 return device_find_by_xname(name); 675 } 676 677 static device_t 678 getdisk(const char *str, int len, int defpart, dev_t *devp, int isdump) 679 { 680 device_t dv; 681 deviter_t di; 682 683 if (len == 4 && strcmp(str, "halt") == 0) 684 kern_reboot(RB_HALT, NULL); 685 else if (len == 6 && strcmp(str, "reboot") == 0) 686 kern_reboot(0, NULL); 687 #if defined(DDB) 688 else if (len == 3 && strcmp(str, "ddb") == 0) { 689 console_debugger(); 690 return NULL; 691 } 692 #endif 693 694 if ((dv = parsedisk(str, len, defpart, devp)) == NULL) { 695 printf("use one of:"); 696 for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); dv != NULL; 697 dv = deviter_next(&di)) { 698 if (DEV_USES_PARTITIONS(dv)) 699 printf(" %s[a-%c]", device_xname(dv), 700 'a' + MAXPARTITIONS - 1); 701 else if (device_class(dv) == DV_DISK) 702 printf(" %s", device_xname(dv)); 703 if (isdump == 0 && device_class(dv) == DV_IFNET) 704 printf(" %s", device_xname(dv)); 705 } 706 deviter_release(&di); 707 dkwedge_print_wnames(); 708 if (isdump) 709 printf(" none"); 710 #if defined(DDB) 711 printf(" ddb"); 712 #endif 713 printf(" halt reboot\n"); 714 } 715 return dv; 716 } 717 718 static const char * 719 getwedgename(const char *name, int namelen) 720 { 721 const char *wpfx1 = "wedge:"; 722 const char *wpfx2 = "NAME="; 723 const int wpfx1len = strlen(wpfx1); 724 const int wpfx2len = strlen(wpfx2); 725 726 if (namelen > wpfx1len && strncmp(name, wpfx1, wpfx1len) == 0) 727 return name + wpfx1len; 728 729 if (namelen > wpfx2len && strncasecmp(name, wpfx2, wpfx2len) == 0) 730 return name + wpfx2len; 731 732 return NULL; 733 } 734 735 static device_t 736 parsedisk(const char *str, int len, int defpart, dev_t *devp) 737 { 738 device_t dv; 739 const char *wname; 740 char c; 741 int majdev, part; 742 char xname[16]; /* same size as dv_xname */ 743 744 if (len == 0) 745 return (NULL); 746 747 if ((wname = getwedgename(str, len)) != NULL) { 748 if ((dv = dkwedge_find_by_wname(wname)) == NULL) 749 return NULL; 750 part = defpart; 751 goto gotdisk; 752 } 753 754 c = str[len-1]; 755 if (c >= 'a' && c <= ('a' + MAXPARTITIONS - 1)) { 756 part = c - 'a'; 757 len--; 758 if (len > sizeof(xname)-1) 759 return NULL; 760 memcpy(xname, str, len); 761 xname[len] = '\0'; 762 str = xname; 763 } else 764 part = defpart; 765 766 dv = finddevice(str); 767 if (dv != NULL) { 768 if (device_class(dv) == DV_DISK) { 769 gotdisk: 770 majdev = devsw_name2blk(device_xname(dv), NULL, 0); 771 if (majdev < 0) 772 panic("parsedisk"); 773 if (DEV_USES_PARTITIONS(dv)) 774 *devp = MAKEDISKDEV(majdev, device_unit(dv), 775 part); 776 else 777 *devp = makedev(majdev, device_unit(dv)); 778 } 779 780 if (device_class(dv) == DV_IFNET) 781 *devp = NODEV; 782 } 783 784 return (dv); 785 }
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