kern_subr.c revision 1.36
1 /* $NetBSD: kern_subr.c,v 1.36 1998/02/18 07:11:46 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998 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. 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1982, 1986, 1991, 1993 42 * The Regents of the University of California. All rights reserved. 43 * (c) UNIX System Laboratories, Inc. 44 * All or some portions of this file are derived from material licensed 45 * to the University of California by American Telephone and Telegraph 46 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 47 * the permission of UNIX System Laboratories, Inc. 48 * 49 * Copyright (c) 1992, 1993 50 * The Regents of the University of California. All rights reserved. 51 * 52 * This software was developed by the Computer Systems Engineering group 53 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 54 * contributed to Berkeley. 55 * 56 * All advertising materials mentioning features or use of this software 57 * must display the following acknowledgement: 58 * This product includes software developed by the University of 59 * California, Lawrence Berkeley Laboratory. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 1. Redistributions of source code must retain the above copyright 65 * notice, this list of conditions and the following disclaimer. 66 * 2. Redistributions in binary form must reproduce the above copyright 67 * notice, this list of conditions and the following disclaimer in the 68 * documentation and/or other materials provided with the distribution. 69 * 3. All advertising materials mentioning features or use of this software 70 * must display the following acknowledgement: 71 * This product includes software developed by the University of 72 * California, Berkeley and its contributors. 73 * 4. Neither the name of the University nor the names of its contributors 74 * may be used to endorse or promote products derived from this software 75 * without specific prior written permission. 76 * 77 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 78 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 79 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 80 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 81 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 82 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 83 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 84 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 85 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 86 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 87 * SUCH DAMAGE. 88 * 89 * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94 90 */ 91 92 #include "opt_uvm.h" 93 94 #include <sys/param.h> 95 #include <sys/systm.h> 96 #include <sys/proc.h> 97 #include <sys/malloc.h> 98 #include <sys/mount.h> 99 #include <sys/device.h> 100 #include <sys/reboot.h> 101 #include <sys/conf.h> 102 #include <sys/disklabel.h> 103 #include <sys/queue.h> 104 105 #include <dev/cons.h> 106 107 #include <net/if.h> 108 109 /* XXX these should eventually move to subr_autoconf.c */ 110 static int findblkmajor __P((const char *, struct devnametobdevmaj *)); 111 static const char *findblkname __P((int, struct devnametobdevmaj *)); 112 static struct device *getdisk __P((char *, int, int, 113 struct devnametobdevmaj *, dev_t *, int)); 114 static struct device *parsedisk __P((char *, int, int, 115 struct devnametobdevmaj *, dev_t *)); 116 static int getstr __P((char *, int)); 117 118 int 119 uiomove(buf, n, uio) 120 register void *buf; 121 register int n; 122 register struct uio *uio; 123 { 124 register struct iovec *iov; 125 u_int cnt; 126 int error = 0; 127 char *cp = buf; 128 129 #ifdef DIAGNOSTIC 130 if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE) 131 panic("uiomove: mode"); 132 if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) 133 panic("uiomove proc"); 134 #endif 135 while (n > 0 && uio->uio_resid) { 136 iov = uio->uio_iov; 137 cnt = iov->iov_len; 138 if (cnt == 0) { 139 uio->uio_iov++; 140 uio->uio_iovcnt--; 141 continue; 142 } 143 if (cnt > n) 144 cnt = n; 145 switch (uio->uio_segflg) { 146 147 case UIO_USERSPACE: 148 if (uio->uio_rw == UIO_READ) 149 error = copyout(cp, iov->iov_base, cnt); 150 else 151 error = copyin(iov->iov_base, cp, cnt); 152 if (error) 153 return (error); 154 break; 155 156 case UIO_SYSSPACE: 157 #if defined(UVM) 158 if (uio->uio_rw == UIO_READ) 159 error = kcopy(cp, iov->iov_base, cnt); 160 else 161 error = kcopy(iov->iov_base, cp, cnt); 162 if (error) 163 return(error); 164 #else 165 if (uio->uio_rw == UIO_READ) 166 bcopy(cp, iov->iov_base, cnt); 167 else 168 bcopy(iov->iov_base, cp, cnt); 169 #endif 170 break; 171 } 172 iov->iov_base += cnt; 173 iov->iov_len -= cnt; 174 uio->uio_resid -= cnt; 175 uio->uio_offset += cnt; 176 cp += cnt; 177 n -= cnt; 178 } 179 return (error); 180 } 181 182 /* 183 * Give next character to user as result of read. 184 */ 185 int 186 ureadc(c, uio) 187 register int c; 188 register struct uio *uio; 189 { 190 register struct iovec *iov; 191 192 if (uio->uio_resid <= 0) 193 panic("ureadc: non-positive resid"); 194 again: 195 if (uio->uio_iovcnt <= 0) 196 panic("ureadc: non-positive iovcnt"); 197 iov = uio->uio_iov; 198 if (iov->iov_len <= 0) { 199 uio->uio_iovcnt--; 200 uio->uio_iov++; 201 goto again; 202 } 203 switch (uio->uio_segflg) { 204 205 case UIO_USERSPACE: 206 if (subyte(iov->iov_base, c) < 0) 207 return (EFAULT); 208 break; 209 210 case UIO_SYSSPACE: 211 *iov->iov_base = c; 212 break; 213 } 214 iov->iov_base++; 215 iov->iov_len--; 216 uio->uio_resid--; 217 uio->uio_offset++; 218 return (0); 219 } 220 221 /* 222 * General routine to allocate a hash table. 223 */ 224 void * 225 hashinit(elements, type, flags, hashmask) 226 int elements, type, flags; 227 u_long *hashmask; 228 { 229 long hashsize; 230 LIST_HEAD(generic, generic) *hashtbl; 231 int i; 232 233 if (elements <= 0) 234 panic("hashinit: bad cnt"); 235 for (hashsize = 1; hashsize <= elements; hashsize <<= 1) 236 continue; 237 hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), type, flags); 238 for (i = 0; i < hashsize; i++) 239 LIST_INIT(&hashtbl[i]); 240 *hashmask = hashsize - 1; 241 return (hashtbl); 242 } 243 244 /* 245 * "Shutdown hook" types, functions, and variables. 246 */ 247 248 struct shutdownhook_desc { 249 LIST_ENTRY(shutdownhook_desc) sfd_list; 250 void (*sfd_fn) __P((void *)); 251 void *sfd_arg; 252 }; 253 254 LIST_HEAD(, shutdownhook_desc) shutdownhook_list; 255 256 void * 257 shutdownhook_establish(fn, arg) 258 void (*fn) __P((void *)); 259 void *arg; 260 { 261 struct shutdownhook_desc *ndp; 262 263 ndp = (struct shutdownhook_desc *) 264 malloc(sizeof (*ndp), M_DEVBUF, M_NOWAIT); 265 if (ndp == NULL) 266 return NULL; 267 268 ndp->sfd_fn = fn; 269 ndp->sfd_arg = arg; 270 LIST_INSERT_HEAD(&shutdownhook_list, ndp, sfd_list); 271 272 return (ndp); 273 } 274 275 void 276 shutdownhook_disestablish(vhook) 277 void *vhook; 278 { 279 #ifdef DIAGNOSTIC 280 struct shutdownhook_desc *dp; 281 282 for (dp = shutdownhook_list.lh_first; dp != NULL; 283 dp = dp->sfd_list.le_next) 284 if (dp == vhook) 285 break; 286 if (dp == NULL) 287 panic("shutdownhook_disestablish: hook not established"); 288 #endif 289 290 LIST_REMOVE((struct shutdownhook_desc *)vhook, sfd_list); 291 free(vhook, M_DEVBUF); 292 } 293 294 /* 295 * Run shutdown hooks. Should be invoked immediately before the 296 * system is halted or rebooted, i.e. after file systems unmounted, 297 * after crash dump done, etc. 298 * 299 * Each shutdown hook is removed from the list before it's run, so that 300 * it won't be run again. 301 */ 302 void 303 doshutdownhooks() 304 { 305 struct shutdownhook_desc *dp; 306 307 while ((dp = shutdownhook_list.lh_first) != NULL) { 308 LIST_REMOVE(dp, sfd_list); 309 (*dp->sfd_fn)(dp->sfd_arg); 310 #if 0 311 /* 312 * Don't bother freeing the hook structure,, since we may 313 * be rebooting because of a memory corruption problem, 314 * and this might only make things worse. It doesn't 315 * matter, anyway, since the system is just about to 316 * reboot. 317 */ 318 free(dp, M_DEVBUF); 319 #endif 320 } 321 } 322 323 /* 324 * "Mountroot hook" types, functions, and variables. 325 */ 326 327 struct mountroothook_desc { 328 LIST_ENTRY(mountroothook_desc) mrd_list; 329 struct device *mrd_device; 330 void (*mrd_func) __P((struct device *)); 331 }; 332 333 LIST_HEAD(, mountroothook_desc) mountroothook_list; 334 335 void * 336 mountroothook_establish(func, dev) 337 void (*func) __P((struct device *)); 338 struct device *dev; 339 { 340 struct mountroothook_desc *mrd; 341 342 mrd = (struct mountroothook_desc *) 343 malloc(sizeof(*mrd), M_DEVBUF, M_NOWAIT); 344 if (mrd == NULL) 345 return (NULL); 346 347 mrd->mrd_device = dev; 348 mrd->mrd_func = func; 349 LIST_INSERT_HEAD(&mountroothook_list, mrd, mrd_list); 350 351 return (mrd); 352 } 353 354 void 355 mountroothook_disestablish(vhook) 356 void *vhook; 357 { 358 #ifdef DIAGNOSTIC 359 struct mountroothook_desc *mrd; 360 361 for (mrd = mountroothook_list.lh_first; mrd != NULL; 362 mrd = mrd->mrd_list.le_next) 363 if (mrd == vhook) 364 break; 365 if (mrd == NULL) 366 panic("mountroothook_disestablish: hook not established"); 367 #endif 368 369 LIST_REMOVE((struct mountroothook_desc *)vhook, mrd_list); 370 free(vhook, M_DEVBUF); 371 } 372 373 void 374 mountroothook_destroy() 375 { 376 struct mountroothook_desc *mrd; 377 378 while ((mrd = mountroothook_list.lh_first) != NULL) { 379 LIST_REMOVE(mrd, mrd_list); 380 free(mrd, M_DEVBUF); 381 } 382 } 383 384 void 385 domountroothook() 386 { 387 struct mountroothook_desc *mrd; 388 389 for (mrd = mountroothook_list.lh_first; mrd != NULL; 390 mrd = mrd->mrd_list.le_next) { 391 if (mrd->mrd_device == root_device) { 392 (*mrd->mrd_func)(root_device); 393 return; 394 } 395 } 396 } 397 398 /* 399 * Determine the root device and, if instructed to, the root file system. 400 */ 401 402 #include "md.h" 403 #if NMD == 0 404 #undef MEMORY_DISK_HOOKS 405 #endif 406 407 #ifdef MEMORY_DISK_HOOKS 408 static struct device fakemdrootdev[NMD]; 409 #endif 410 411 void 412 setroot(bootdv, bootpartition, nam2blk) 413 struct device *bootdv; 414 int bootpartition; 415 struct devnametobdevmaj *nam2blk; 416 { 417 struct device *dv; 418 int len, print_newline = 0; 419 dev_t nrootdev; 420 dev_t ndumpdev = NODEV; 421 char buf[128]; 422 const char *rootdevname; 423 const char *dumpdevname; 424 struct device *rootdv = NULL; /* XXX gcc -Wuninitialized */ 425 struct device *dumpdv = NULL; 426 struct ifnet *ifp; 427 const char *deffsname; 428 struct vfsops *vops; 429 extern int (*mountroot) __P((void)); 430 static struct devnametobdevmaj *last_nam2blk; 431 432 if (nam2blk == NULL) { 433 if (last_nam2blk == NULL) 434 panic("setroot: no name to bdev major map"); 435 nam2blk = last_nam2blk; 436 } 437 last_nam2blk = nam2blk; 438 439 #ifdef MEMORY_DISK_HOOKS 440 for (i = 0; i < NMD; i++) { 441 fakemdrootdev[i].dv_class = DV_DISK; 442 fakemdrootdev[i].dv_cfdata = NULL; 443 fakemdrootdev[i].dv_unit = i; 444 fakemdrootdev[i].dv_parent = NULL; 445 sprintf(fakemdrootdev[i].dv_xname, "md%d", i); 446 } 447 #endif /* MEMORY_DISK_HOOKS */ 448 449 #ifdef MEMORY_DISK_IS_ROOT 450 bootdv = &fakemdrootdev[0]; 451 bootpartition = 0; 452 #endif 453 454 /* 455 * If NFS is specified as the file system, and we found 456 * a DV_DISK boot device (or no boot device at all), then 457 * find a reasonable network interface for "rootspec". 458 */ 459 vops = vfs_getopsbyname("nfs"); 460 if (vops != NULL && vops->vfs_mountroot == mountroot && 461 rootspec == NULL && 462 (bootdv == NULL || bootdv->dv_class != DV_IFNET)) { 463 for (ifp = ifnet.tqh_first; ifp != NULL; 464 ifp = ifp->if_list.tqe_next) 465 if ((ifp->if_flags & 466 (IFF_LOOPBACK|IFF_POINTOPOINT)) == 0) 467 break; 468 if (ifp == NULL) { 469 /* 470 * Can't find a suitable interface; ask the 471 * user. 472 */ 473 boothowto |= RB_ASKNAME; 474 } else { 475 /* 476 * Have a suitable interface; behave as if 477 * the user specified this interface. 478 */ 479 rootspec = (const char *)ifp->if_xname; 480 } 481 } 482 483 /* 484 * If wildcarded root and we the boot device wasn't determined, 485 * ask the user. 486 */ 487 if (rootspec == NULL && bootdv == NULL) 488 boothowto |= RB_ASKNAME; 489 490 top: 491 if (boothowto & RB_ASKNAME) { 492 struct device *defdumpdv; 493 494 for (;;) { 495 printf("root device"); 496 if (bootdv != NULL) { 497 printf(" (default %s", bootdv->dv_xname); 498 if (bootdv->dv_class == DV_DISK) 499 printf("%c", bootpartition + 'a'); 500 printf(")"); 501 } 502 printf(": "); 503 len = getstr(buf, sizeof(buf)); 504 if (len == 0 && bootdv != NULL) { 505 strcpy(buf, bootdv->dv_xname); 506 len = strlen(buf); 507 } 508 if (len > 0 && buf[len - 1] == '*') { 509 buf[--len] = '\0'; 510 dv = getdisk(buf, len, 1, nam2blk, 511 &nrootdev, 0); 512 if (dv != NULL) { 513 rootdv = dv; 514 break; 515 } 516 } 517 dv = getdisk(buf, len, bootpartition, nam2blk, 518 &nrootdev, 0); 519 if (dv != NULL) { 520 rootdv = dv; 521 break; 522 } 523 } 524 525 /* 526 * Set up the default dump device. If root is on 527 * a network device, there is no default dump 528 * device, since we don't support dumps to the 529 * network. 530 */ 531 if (rootdv->dv_class == DV_IFNET) 532 defdumpdv = NULL; 533 else 534 defdumpdv = rootdv; 535 536 for (;;) { 537 printf("dump device"); 538 if (defdumpdv != NULL) { 539 /* 540 * Note, we know it's a disk if we get here. 541 */ 542 printf(" (default %sb)", defdumpdv->dv_xname); 543 } 544 printf(": "); 545 len = getstr(buf, sizeof(buf)); 546 if (len == 0) { 547 if (defdumpdv != NULL) { 548 ndumpdev = MAKEDISKDEV(major(nrootdev), 549 DISKUNIT(nrootdev), 1); 550 } 551 if (rootdv->dv_class == DV_IFNET) 552 dumpdv = NULL; 553 else 554 dumpdv = rootdv; 555 break; 556 } 557 if (len == 4 && strcmp(buf, "none") == 0) { 558 dumpspec = "none"; 559 goto havedump; 560 } 561 dv = getdisk(buf, len, 1, nam2blk, &ndumpdev, 1); 562 if (dv) { 563 dumpdv = dv; 564 break; 565 } 566 } 567 568 havedump: 569 rootdev = nrootdev; 570 dumpdev = ndumpdev; 571 572 for (vops = LIST_FIRST(&vfs_list); vops != NULL; 573 vops = LIST_NEXT(vops, vfs_list)) { 574 if (vops->vfs_mountroot != NULL && 575 vops->vfs_mountroot == mountroot) 576 break; 577 } 578 579 if (vops == NULL) { 580 mountroot = NULL; 581 deffsname = "generic"; 582 } else 583 deffsname = vops->vfs_name; 584 585 for (;;) { 586 printf("file system (default %s): ", deffsname); 587 len = getstr(buf, sizeof(buf)); 588 if (len == 0) 589 break; 590 if (len == 4 && strcmp(buf, "halt") == 0) 591 cpu_reboot(RB_HALT, NULL); 592 else if (len == 7 && strcmp(buf, "generic") == 0) { 593 mountroot = NULL; 594 break; 595 } 596 vops = vfs_getopsbyname(buf); 597 if (vops == NULL || vops->vfs_mountroot == NULL) { 598 printf("use one of: generic"); 599 for (vops = LIST_FIRST(&vfs_list); 600 vops != NULL; 601 vops = LIST_NEXT(vops, vfs_list)) { 602 if (vops->vfs_mountroot != NULL) 603 printf(" %s", vops->vfs_name); 604 } 605 printf(" halt\n"); 606 } else { 607 mountroot = vops->vfs_mountroot; 608 break; 609 } 610 } 611 612 } else if (rootspec == NULL) { 613 int majdev; 614 615 /* 616 * Wildcarded root; use the boot device. 617 */ 618 rootdv = bootdv; 619 620 majdev = findblkmajor(bootdv->dv_xname, nam2blk); 621 if (majdev >= 0) { 622 /* 623 * Root is on a disk. `bootpartition' is root. 624 */ 625 rootdev = MAKEDISKDEV(majdev, bootdv->dv_unit, 626 bootpartition); 627 } 628 } else { 629 630 /* 631 * `root on <dev> ...' 632 */ 633 634 /* 635 * If it's a network interface, we can bail out 636 * early. 637 */ 638 for (dv = alldevs.tqh_first; dv != NULL; 639 dv = dv->dv_list.tqe_next) 640 if (strcmp(dv->dv_xname, rootspec) == 0) 641 break; 642 if (dv != NULL && dv->dv_class == DV_IFNET) { 643 rootdv = dv; 644 goto haveroot; 645 } 646 647 rootdevname = findblkname(major(rootdev), nam2blk); 648 if (rootdevname == NULL) { 649 printf("unknown device major 0x%x\n", rootdev); 650 boothowto |= RB_ASKNAME; 651 goto top; 652 } 653 bzero(buf, sizeof(buf)); 654 sprintf(buf, "%s%d", rootdevname, DISKUNIT(rootdev)); 655 656 for (dv = alldevs.tqh_first; dv != NULL; 657 dv = dv->dv_list.tqe_next) { 658 if (strcmp(buf, dv->dv_xname) == 0) { 659 rootdv = dv; 660 break; 661 } 662 } 663 if (rootdv == NULL) { 664 printf("device %s (0x%x) not configured\n", 665 buf, rootdev); 666 boothowto |= RB_ASKNAME; 667 goto top; 668 } 669 } 670 671 haveroot: 672 673 root_device = rootdv; 674 675 switch (rootdv->dv_class) { 676 case DV_IFNET: 677 /* Nothing. */ 678 break; 679 680 case DV_DISK: 681 printf("root on %s%c", rootdv->dv_xname, 682 DISKPART(rootdev) + 'a'); 683 print_newline = 1; 684 break; 685 686 default: 687 printf("can't determine root device\n"); 688 boothowto |= RB_ASKNAME; 689 goto top; 690 } 691 692 /* 693 * Now configure the dump device. 694 */ 695 696 if (dumpspec != NULL && strcmp(dumpspec, "none") == 0) { 697 /* 698 * Operator doesn't want a dump device. 699 */ 700 goto nodumpdev; 701 } 702 703 /* 704 * If we haven't figured out the dump device, do so, with 705 * the following rules: 706 * 707 * (a) We already know dumpdv in the RB_ASKNAME case. 708 * 709 * (b) If dumpspec is set, try to use it. If the device 710 * is not available, punt. 711 * 712 * (c) If dumpspec is not set, the dump device is 713 * wildcarded or unspecified. If the root device 714 * is DV_IFNET, punt. Otherwise, use partition b 715 * of the root device. 716 */ 717 718 if (boothowto & RB_ASKNAME) { 719 if (dumpdv == NULL) { 720 /* 721 * Just return; dumpdev is already set to NODEV 722 * and we don't want to print a newline in this 723 * case. 724 */ 725 return; 726 } 727 goto out; 728 } 729 730 if (dumpspec != NULL) { 731 if (dumpdev == NODEV) { 732 /* 733 * Looks like they tried to pick a network 734 * device. Oops. 735 */ 736 goto nodumpdev; 737 } 738 739 dumpdevname = findblkname(major(dumpdev), nam2blk); 740 if (dumpdevname == NULL) 741 goto nodumpdev; 742 bzero(buf, sizeof(buf)); 743 sprintf(buf, "%s%d", dumpdevname, DISKUNIT(dumpdev)); 744 745 for (dv = alldevs.tqh_first; dv != NULL; 746 dv = dv->dv_list.tqe_next) { 747 if (strcmp(buf, dv->dv_xname) == 0) { 748 dumpdv = dv; 749 break; 750 } 751 } 752 if (dv == NULL) { 753 /* 754 * Device not configured. 755 */ 756 goto nodumpdev; 757 } 758 } else if (rootdv->dv_class == DV_IFNET) 759 goto nodumpdev; 760 else { 761 dumpdv = rootdv; 762 dumpdev = MAKEDISKDEV(major(rootdev), dumpdv->dv_unit, 1); 763 } 764 765 out: 766 printf(" dumps on %s%c\n", dumpdv->dv_xname, DISKPART(dumpdev) + 'a'); 767 return; 768 769 nodumpdev: 770 dumpdev = NODEV; 771 if (print_newline) 772 printf("\n"); 773 } 774 775 static int 776 findblkmajor(name, nam2blk) 777 const char *name; 778 struct devnametobdevmaj *nam2blk; 779 { 780 int i; 781 782 if (nam2blk == NULL) 783 return (-1); 784 785 for (i = 0; nam2blk[i].d_name != NULL; i++) 786 if (strncmp(name, nam2blk[i].d_name, 787 strlen(nam2blk[i].d_name)) == 0) 788 return (nam2blk[i].d_maj); 789 return (-1); 790 } 791 792 const char * 793 findblkname(maj, nam2blk) 794 int maj; 795 struct devnametobdevmaj *nam2blk; 796 { 797 int i; 798 799 if (nam2blk == NULL) 800 return (NULL); 801 802 for (i = 0; nam2blk[i].d_name != NULL; i++) 803 if (nam2blk[i].d_maj == maj) 804 return (nam2blk[i].d_name); 805 return (NULL); 806 } 807 808 static struct device * 809 getdisk(str, len, defpart, nam2blk, devp, isdump) 810 char *str; 811 int len, defpart; 812 struct devnametobdevmaj *nam2blk; 813 dev_t *devp; 814 int isdump; 815 { 816 struct device *dv; 817 #ifdef MEMORY_DISK_HOOKS 818 int i; 819 #endif 820 821 if ((dv = parsedisk(str, len, defpart, nam2blk, devp)) == NULL) { 822 printf("use one of:"); 823 #ifdef MEMORY_DISK_HOOKS 824 if (isdump == 0) 825 for (i = 0; i < NMD; i++) 826 printf(" %s[a-%c]", fakemdrootdev[i].dv_xname, 827 'a' + MAXPARTITIONS - 1); 828 #endif 829 for (dv = alldevs.tqh_first; dv != NULL; 830 dv = dv->dv_list.tqe_next) { 831 if (dv->dv_class == DV_DISK) 832 printf(" %s[a-%c]", dv->dv_xname, 833 'a' + MAXPARTITIONS - 1); 834 if (isdump == 0 && dv->dv_class == DV_IFNET) 835 printf(" %s", dv->dv_xname); 836 } 837 if (isdump) 838 printf(" none"); 839 printf(" halt\n"); 840 } 841 return (dv); 842 } 843 844 static struct device * 845 parsedisk(str, len, defpart, nam2blk, devp) 846 char *str; 847 int len, defpart; 848 struct devnametobdevmaj *nam2blk; 849 dev_t *devp; 850 { 851 struct device *dv; 852 char *cp, c; 853 int majdev, part; 854 #ifdef MEMORY_DISK_HOOKS 855 int i; 856 #endif 857 858 if (len == 0) 859 return (NULL); 860 861 if (len == 4 && strcmp(str, "halt") == 0) 862 cpu_reboot(RB_HALT, NULL); 863 864 cp = str + len - 1; 865 c = *cp; 866 if (c >= 'a' && c <= ('a' + MAXPARTITIONS - 1)) { 867 part = c - 'a'; 868 *cp = '\0'; 869 } else 870 part = defpart; 871 872 #ifdef MEMORY_DISK_HOOKS 873 for (i = 0; i < NMD; i++) 874 if (strcmp(str, fakemdrootdev[i].dv_xname) == 0) { 875 dv = &fakemdrootdev[i]; 876 goto gotdisk; 877 } 878 #endif 879 880 for (dv = alldevs.tqh_first; dv != NULL; dv = dv->dv_list.tqe_next) { 881 if (dv->dv_class == DV_DISK && 882 strcmp(str, dv->dv_xname) == 0) { 883 #ifdef MEMORY_DISK_HOOKS 884 gotdisk: 885 #endif 886 majdev = findblkmajor(dv->dv_xname, nam2blk); 887 if (majdev < 0) 888 panic("parsedisk"); 889 *devp = MAKEDISKDEV(majdev, dv->dv_unit, part); 890 break; 891 } 892 893 if (dv->dv_class == DV_IFNET && 894 strcmp(str, dv->dv_xname) == 0) { 895 *devp = NODEV; 896 break; 897 } 898 } 899 900 *cp = c; 901 return (dv); 902 } 903 904 /* 905 * XXX shouldn't this be a common function? 906 */ 907 static int 908 getstr(cp, size) 909 char *cp; 910 int size; 911 { 912 char *lp; 913 int c, len; 914 915 cnpollc(1); 916 917 lp = cp; 918 len = 0; 919 for (;;) { 920 c = cngetc(); 921 switch (c) { 922 case '\n': 923 case '\r': 924 printf("\n"); 925 *lp++ = '\0'; 926 cnpollc(0); 927 return (len); 928 case '\b': 929 case '\177': 930 case '#': 931 if (len) { 932 --len; 933 --lp; 934 printf("\b \b"); 935 } 936 continue; 937 case '@': 938 case 'u'&037: 939 len = 0; 940 lp = cp; 941 printf("\n"); 942 continue; 943 default: 944 if (len + 1 >= size || c < ' ') { 945 printf("\007"); 946 continue; 947 } 948 printf("%c", c); 949 ++len; 950 *lp++ = c; 951 } 952 } 953 } 954
Indexes created Tue Sep 23 07:09:52 GMT 2025