1 /*- 2 * Copyright (c) 1986, 1988, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 39 * $Id: kern_shutdown.c,v 1.31 1998/05/12 17:34:02 bde Exp $ 40 */ 41 42 #include "opt_ddb.h" 43 #include "opt_hw_wdog.h" 44 #include "opt_panic.h" 45 #include "opt_show_busybufs.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/buf.h> 50 #include <sys/reboot.h> 51 #include <sys/proc.h> 52 #include <sys/malloc.h> 53 #include <sys/kernel.h> 54 #include <sys/mount.h> 55 #include <sys/sysctl.h> 56 #include <sys/conf.h> 57 #include <sys/sysproto.h> 58 59 #include <machine/pcb.h> 60 #include <machine/clock.h> 61 #include <machine/cons.h> 62 #include <machine/md_var.h> 63 #ifdef SMP 64 #include <machine/smp.h> /* smp_active, cpuid */ 65 #endif 66 67 #include <sys/signalvar.h> 68 69 #ifndef PANIC_REBOOT_WAIT_TIME 70 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 71 #endif 72 73 /* 74 * Note that stdarg.h and the ANSI style va_start macro is used for both 75 * ANSI and traditional C compilers. 76 */ 77 #include <machine/stdarg.h> 78 79 #ifdef DDB 80 #ifdef DDB_UNATTENDED 81 static int debugger_on_panic = 0; 82 #else 83 static int debugger_on_panic = 1; 84 #endif 85 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 86 &debugger_on_panic, 0, ""); 87 #endif 88 89 #ifdef HW_WDOG 90 /* 91 * If there is a hardware watchdog, point this at the function needed to 92 * hold it off. 93 * It's needed when the kernel needs to do some lengthy operations. 94 * e.g. in wd.c when dumping core.. It's most annoying to have 95 * your precious core-dump only half written because the wdog kicked in. 96 */ 97 watchdog_tickle_fn wdog_tickler = NULL; 98 #endif /* HW_WDOG */ 99 100 /* 101 * Variable panicstr contains argument to first call to panic; used as flag 102 * to indicate that the kernel has already called panic. 103 */ 104 const char *panicstr; 105 106 /* 107 * callout list for things to do a shutdown 108 */ 109 typedef struct shutdown_list_element { 110 struct shutdown_list_element *next; 111 bootlist_fn function; 112 void *arg; 113 } *sle_p; 114 115 /* 116 * there are two shutdown lists. Some things need to be shut down 117 * Earlier than others. 118 */ 119 static sle_p shutdown_list1; 120 static sle_p shutdown_list2; 121 122 static void boot __P((int)) __dead2; 123 static void dumpsys __P((void)); 124 125 #ifndef _SYS_SYSPROTO_H_ 126 struct reboot_args { 127 int opt; 128 }; 129 #endif 130 /* ARGSUSED */ 131 132 /* 133 * The system call that results in a reboot 134 */ 135 int 136 reboot(p, uap) 137 struct proc *p; 138 struct reboot_args *uap; 139 { 140 int error; 141 142 if ((error = suser(p->p_ucred, &p->p_acflag))) 143 return (error); 144 145 boot(uap->opt); 146 return (0); 147 } 148 149 /* 150 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 151 */ 152 void 153 shutdown_nice() 154 { 155 /* Send a signal to init(8) and have it shutdown the world */ 156 if (initproc != NULL) { 157 psignal(initproc, SIGINT); 158 } else { 159 /* No init(8) running, so simply reboot */ 160 boot(RB_NOSYNC); 161 } 162 return; 163 } 164 static int waittime = -1; 165 static struct pcb dumppcb; 166 167 /* 168 * Go through the rigmarole of shutting down.. 169 * this used to be in machdep.c but I'll be dammned if I could see 170 * anything machine dependant in it. 171 */ 172 static void 173 boot(howto) 174 int howto; 175 { 176 sle_p ep; 177 178 #ifdef SMP 179 if (smp_active) { 180 printf("boot() called on cpu#%d\n", cpuid); 181 } 182 #endif 183 /* 184 * Do any callouts that should be done BEFORE syncing the filesystems. 185 */ 186 ep = shutdown_list1; 187 while (ep) { 188 shutdown_list1 = ep->next; 189 (*ep->function)(howto, ep->arg); 190 ep = ep->next; 191 } 192 193 /* 194 * Now sync filesystems 195 */ 196 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 197 register struct buf *bp; 198 int iter, nbusy; 199 200 waittime = 0; 201 printf("\nsyncing disks... "); 202 203 sync(&proc0, NULL); 204 205 /* 206 * With soft updates, some buffers that are 207 * written will be remarked as dirty until other 208 * buffers are written. 209 */ 210 for (iter = 0; iter < 20; iter++) { 211 nbusy = 0; 212 for (bp = &buf[nbuf]; --bp >= buf; ) { 213 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 214 nbusy++; 215 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 216 == B_DELWRI) { 217 /* bawrite(bp);*/ 218 nbusy++; 219 } 220 } 221 if (nbusy == 0) 222 break; 223 printf("%d ", nbusy); 224 sync(&proc0, NULL); 225 DELAY(50000 * iter); 226 } 227 if (nbusy) { 228 /* 229 * Failed to sync all blocks. Indicate this and don't 230 * unmount filesystems (thus forcing an fsck on reboot). 231 */ 232 printf("giving up\n"); 233 #ifdef SHOW_BUSYBUFS 234 nbusy = 0; 235 for (bp = &buf[nbuf]; --bp >= buf; ) { 236 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 237 nbusy++; 238 printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno); 239 } 240 } 241 DELAY(5000000); /* 5 seconds */ 242 #endif 243 } else { 244 printf("done\n"); 245 /* 246 * Unmount filesystems 247 */ 248 if (panicstr == 0) 249 vfs_unmountall(); 250 } 251 DELAY(100000); /* wait for console output to finish */ 252 } 253 254 /* 255 * Ok, now do things that assume all filesystem activity has 256 * been completed. 257 */ 258 ep = shutdown_list2; 259 while (ep) { 260 shutdown_list2 = ep->next; 261 (*ep->function)(howto, ep->arg); 262 ep = ep->next; 263 } 264 splhigh(); 265 if (howto & RB_HALT) { 266 cpu_power_down(); 267 printf("\n"); 268 printf("The operating system has halted.\n"); 269 printf("Please press any key to reboot.\n\n"); 270 switch (cngetc()) { 271 case -1: /* No console, just die */ 272 cpu_halt(); 273 /* NOTREACHED */ 274 default: 275 break; 276 } 277 } else { 278 if (howto & RB_DUMP) { 279 if (!cold) { 280 savectx(&dumppcb); 281 dumppcb.pcb_cr3 = rcr3(); 282 dumpsys(); 283 } 284 285 if (PANIC_REBOOT_WAIT_TIME != 0) { 286 if (PANIC_REBOOT_WAIT_TIME != -1) { 287 int loop; 288 printf("Automatic reboot in %d seconds - press a key on the console to abort\n", 289 PANIC_REBOOT_WAIT_TIME); 290 for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { 291 DELAY(1000 * 100); /* 1/10th second */ 292 /* Did user type a key? */ 293 if (cncheckc() != -1) 294 break; 295 } 296 if (!loop) 297 goto die; 298 } 299 } else { /* zero time specified - reboot NOW */ 300 goto die; 301 } 302 printf("--> Press a key on the console to reboot <--\n"); 303 cngetc(); 304 } 305 } 306 die: 307 printf("Rebooting...\n"); 308 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 309 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 310 cpu_reset(); 311 for(;;) ; 312 /* NOTREACHED */ 313 } 314 315 /* 316 * Magic number for savecore 317 * 318 * exported (symorder) and used at least by savecore(8) 319 * 320 */ 321 static u_long const dumpmag = 0x8fca0101UL; 322 323 static int dumpsize = 0; /* also for savecore */ 324 325 static int dodump = 1; 326 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); 327 328 /* ARGSUSED */ 329 static void dump_conf __P((void *dummy)); 330 static void 331 dump_conf(dummy) 332 void *dummy; 333 { 334 cpu_dumpconf(); 335 } 336 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 337 338 /* 339 * Doadump comes here after turning off memory management and 340 * getting on the dump stack, either when called above, or by 341 * the auto-restart code. 342 */ 343 static void 344 dumpsys(void) 345 { 346 347 if (!dodump) 348 return; 349 if (dumpdev == NODEV) 350 return; 351 if ((minor(dumpdev)&07) != 1) 352 return; 353 if (!(bdevsw[major(dumpdev)])) 354 return; 355 if (!(bdevsw[major(dumpdev)]->d_dump)) 356 return; 357 dumpsize = Maxmem; 358 printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); 359 printf("dump "); 360 switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { 361 362 case ENXIO: 363 printf("device bad\n"); 364 break; 365 366 case EFAULT: 367 printf("device not ready\n"); 368 break; 369 370 case EINVAL: 371 printf("area improper\n"); 372 break; 373 374 case EIO: 375 printf("i/o error\n"); 376 break; 377 378 case EINTR: 379 printf("aborted from console\n"); 380 break; 381 382 default: 383 printf("succeeded\n"); 384 break; 385 } 386 } 387 388 /* 389 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 390 * and then reboots. If we are called twice, then we avoid trying to sync 391 * the disks as this often leads to recursive panics. 392 */ 393 void 394 panic(const char *fmt, ...) 395 { 396 int bootopt; 397 va_list ap; 398 399 bootopt = RB_AUTOBOOT | RB_DUMP; 400 if (panicstr) 401 bootopt |= RB_NOSYNC; 402 else 403 panicstr = fmt; 404 405 printf("panic: "); 406 va_start(ap, fmt); 407 vprintf(fmt, ap); 408 va_end(ap); 409 printf("\n"); 410 #ifdef SMP 411 /* three seperate prints in case of an unmapped page and trap */ 412 printf("mp_lock = %08x; ", mp_lock); 413 printf("cpuid = %d; ", cpuid); 414 printf("lapic.id = %08x\n", lapic.id); 415 #endif 416 417 #if defined(DDB) 418 if (debugger_on_panic) 419 Debugger ("panic"); 420 #endif 421 boot(bootopt); 422 } 423 424 /* 425 * Two routines to handle adding/deleting items on the 426 * shutdown callout lists 427 * 428 * at_shutdown(): 429 * Take the arguments given and put them onto the shutdown callout list. 430 * However first make sure that it's not already there. 431 * returns 0 on success. 432 */ 433 int 434 at_shutdown(bootlist_fn function, void *arg, int position) 435 { 436 sle_p ep, *epp; 437 438 switch(position) { 439 case SHUTDOWN_PRE_SYNC: 440 epp = &shutdown_list1; 441 break; 442 case SHUTDOWN_POST_SYNC: 443 epp = &shutdown_list2; 444 break; 445 default: 446 printf("bad exit callout list specified\n"); 447 return (EINVAL); 448 } 449 if (rm_at_shutdown(function, arg)) 450 printf("exit callout entry already present\n"); 451 ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT); 452 if (ep == NULL) 453 return (ENOMEM); 454 ep->next = *epp; 455 ep->function = function; 456 ep->arg = arg; 457 *epp = ep; 458 return (0); 459 } 460 461 /* 462 * Scan the exit callout lists for the given items and remove them. 463 * Returns the number of items removed. 464 */ 465 int 466 rm_at_shutdown(bootlist_fn function, void *arg) 467 { 468 sle_p *epp, ep; 469 int count; 470 471 count = 0; 472 epp = &shutdown_list1; 473 ep = *epp; 474 while (ep) { 475 if ((ep->function == function) && (ep->arg == arg)) { 476 *epp = ep->next; 477 free(ep, M_TEMP); 478 count++; 479 } else { 480 epp = &ep->next; 481 } 482 ep = *epp; 483 } 484 epp = &shutdown_list2; 485 ep = *epp; 486 while (ep) { 487 if ((ep->function == function) && (ep->arg == arg)) { 488 *epp = ep->next; 489 free(ep, M_TEMP); 490 count++; 491 } else { 492 epp = &ep->next; 493 } 494 ep = *epp; 495 } 496 return (count); 497 } 498 499