kern_shutdown.c revision 18277
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 1.6 1996/09/07 19:13:09 sos Exp $ 40 */ 41 42#include "opt_ddb.h" 43 44#include <sys/param.h> 45#include <sys/systm.h> 46#include <sys/reboot.h> 47#include <sys/msgbuf.h> 48#include <sys/proc.h> 49#include <sys/vnode.h> 50#include <sys/tty.h> 51#include <sys/tprintf.h> 52#include <sys/syslog.h> 53#include <sys/malloc.h> 54#include <sys/kernel.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 64#include <sys/utsname.h> 65#include <sys/signalvar.h> 66 67#ifndef PANIC_REBOOT_WAIT_TIME 68#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 69#endif 70 71/* 72 * Note that stdarg.h and the ANSI style va_start macro is used for both 73 * ANSI and traditional C compilers. 74 */ 75#include <machine/stdarg.h> 76 77#if defined(DDB) 78#ifdef DDB_UNATTENDED 79 static int debugger_on_panic = 0; 80#else 81 static int debugger_on_panic = 1; 82#endif 83 84SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 85 &debugger_on_panic, 0, ""); 86#endif 87 88 89/* 90 * Variable panicstr contains argument to first call to panic; used as flag 91 * to indicate that the kernel has already called panic. 92 */ 93const char *panicstr; 94 95/* 96 * callout list for things to do a shutdown 97 */ 98typedef struct shutdown_list_element { 99 struct shutdown_list_element *next; 100 bootlist_fn function; 101 void *arg; 102} *sle_p; 103 104/* 105 * there are two shutdown lists. Some things need to be shut down 106 * Earlier than others. 107 */ 108static sle_p shutdown_list1; 109static sle_p shutdown_list2; 110 111 112static void dumpsys(void); 113 114#ifndef _SYS_SYSPROTO_H_ 115struct reboot_args { 116 int opt; 117}; 118#endif 119/* ARGSUSED */ 120 121/* 122 * The system call that results in a reboot 123 */ 124int 125reboot(p, uap, retval) 126 struct proc *p; 127 struct reboot_args *uap; 128 int *retval; 129{ 130 int error; 131 132 if ((error = suser(p->p_ucred, &p->p_acflag))) 133 return (error); 134 135 boot(uap->opt); 136 return (0); 137} 138 139/* 140 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 141 */ 142void 143shutdown_nice(void) 144{ 145 /* Send a signal to init(8) and have it shutdown the world */ 146 if (initproc != NULL) { 147 psignal(initproc, SIGINT); 148 } else { 149 /* No init(8) running, so simply reboot */ 150 boot(RB_NOSYNC); 151 } 152 return; 153} 154static int waittime = -1; 155static struct pcb dumppcb; 156 157/* 158 * Go through the rigmarole of shutting down.. 159 * this used to be in machdep.c but I'll be dammned if I could see 160 * anything machine dependant in it. 161 */ 162void 163boot(howto) 164 int howto; 165{ 166 sle_p ep; 167 168 ep = shutdown_list1; 169 while (ep) { 170 shutdown_list1 = ep->next; 171 (*ep->function)(howto, ep->arg); 172 ep = ep->next; 173 } 174 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 175 register struct buf *bp; 176 int iter, nbusy; 177 178 waittime = 0; 179 printf("\nsyncing disks... "); 180 181 sync(&proc0, NULL, NULL); 182 183 for (iter = 0; iter < 20; iter++) { 184 nbusy = 0; 185 for (bp = &buf[nbuf]; --bp >= buf; ) { 186 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 187 nbusy++; 188 } 189 } 190 if (nbusy == 0) 191 break; 192 printf("%d ", nbusy); 193 DELAY(40000 * iter); 194 } 195 if (nbusy) { 196 /* 197 * Failed to sync all blocks. Indicate this and don't 198 * unmount filesystems (thus forcing an fsck on reboot). 199 */ 200 printf("giving up\n"); 201#ifdef SHOW_BUSYBUFS 202 nbusy = 0; 203 for (bp = &buf[nbuf]; --bp >= buf; ) { 204 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 205 nbusy++; 206 printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno); 207 } 208 } 209 DELAY(5000000); /* 5 seconds */ 210#endif 211 } else { 212 printf("done\n"); 213 /* 214 * Unmount filesystems 215 */ 216 if (panicstr == 0) 217 vfs_unmountall(); 218 } 219 DELAY(100000); /* wait for console output to finish */ 220 } 221 ep = shutdown_list2; 222 while (ep) { 223 shutdown_list2 = ep->next; 224 (*ep->function)(howto, ep->arg); 225 ep = ep->next; 226 } 227 splhigh(); 228 if (howto & RB_HALT) { 229 printf("\n"); 230 printf("The operating system has halted.\n"); 231 printf("Please press any key to reboot.\n\n"); 232 cngetc(); 233 } else { 234 if (howto & RB_DUMP) { 235 if (!cold) { 236 savectx(&dumppcb); 237 dumppcb.pcb_cr3 = rcr3(); 238 dumpsys(); 239 } 240 241 if (PANIC_REBOOT_WAIT_TIME != 0) { 242 if (PANIC_REBOOT_WAIT_TIME != -1) { 243 int loop; 244 printf("Automatic reboot in %d seconds - press a key on the console to abort\n", 245 PANIC_REBOOT_WAIT_TIME); 246 for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { 247 DELAY(1000 * 100); /* 1/10th second */ 248 if (cncheckc()) /* Did user type a key? */ 249 break; 250 } 251 if (!loop) 252 goto die; 253 } 254 } else { /* zero time specified - reboot NOW */ 255 goto die; 256 } 257 printf("--> Press a key on the console to reboot <--\n"); 258 cngetc(); 259 } 260 } 261die: 262 printf("Rebooting...\n"); 263 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 264 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 265 cpu_reset(); 266 for(;;) ; 267 /* NOTREACHED */ 268} 269 270/* 271 * Magic number for savecore 272 * 273 * exported (symorder) and used at least by savecore(8) 274 * 275 */ 276static u_long const dumpmag = 0x8fca0101UL; 277 278static int dumpsize = 0; /* also for savecore */ 279 280static int dodump = 1; 281SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); 282 283/* 284 * Doadump comes here after turning off memory management and 285 * getting on the dump stack, either when called above, or by 286 * the auto-restart code. 287 */ 288static void 289dumpsys(void) 290{ 291 292 if (!dodump) 293 return; 294 if (dumpdev == NODEV) 295 return; 296 if ((minor(dumpdev)&07) != 1) 297 return; 298 if (!(bdevsw[major(dumpdev)])) 299 return; 300 if (!(bdevsw[major(dumpdev)]->d_dump)) 301 return; 302 dumpsize = Maxmem; 303 printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); 304 printf("dump "); 305 switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { 306 307 case ENXIO: 308 printf("device bad\n"); 309 break; 310 311 case EFAULT: 312 printf("device not ready\n"); 313 break; 314 315 case EINVAL: 316 printf("area improper\n"); 317 break; 318 319 case EIO: 320 printf("i/o error\n"); 321 break; 322 323 case EINTR: 324 printf("aborted from console\n"); 325 break; 326 327 default: 328 printf("succeeded\n"); 329 break; 330 } 331} 332 333/* 334 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 335 * and then reboots. If we are called twice, then we avoid trying to sync 336 * the disks as this often leads to recursive panics. 337 */ 338void 339panic(const char *fmt, ...) 340{ 341 int bootopt; 342 va_list ap; 343 344 bootopt = RB_AUTOBOOT | RB_DUMP; 345 if (panicstr) 346 bootopt |= RB_NOSYNC; 347 else 348 panicstr = fmt; 349 350 printf("panic: "); 351 va_start(ap, fmt); 352 vprintf(fmt, ap); 353 va_end(ap); 354 printf("\n"); 355 356#if defined(DDB) 357 if (debugger_on_panic) 358 Debugger ("panic"); 359#endif 360 boot(bootopt); 361} 362 363/* 364 * Two routines to handle adding/deleting items on the 365 * shutdown callout lists 366 * 367 * at_shutdown(): 368 * Take the arguments given and put them onto the shutdown callout list. 369 * However first make sure that it's not already there. 370 * returns 0 on success. 371 */ 372int 373at_shutdown(bootlist_fn function, void *arg, int position) 374{ 375 sle_p ep, *epp; 376 377 switch(position) { 378 case SHUTDOWN_PRE_SYNC: 379 epp = &shutdown_list1; 380 break; 381 case SHUTDOWN_POST_SYNC: 382 epp = &shutdown_list2; 383 break; 384 default: 385 printf("bad exit callout list specified\n"); 386 return (EINVAL); 387 } 388 if (rm_at_shutdown(function, arg)) 389 printf("exit callout entry already present\n"); 390 ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT); 391 if (ep == NULL) 392 return (ENOMEM); 393 ep->next = *epp; 394 ep->function = function; 395 ep->arg = arg; 396 *epp = ep; 397 return (0); 398} 399 400/* 401 * Scan the exit callout lists for the given items and remove them. 402 * Returns the number of items removed. 403 */ 404int 405rm_at_shutdown(bootlist_fn function, void *arg) 406{ 407 sle_p *epp, ep; 408 int count; 409 410 count = 0; 411 epp = &shutdown_list1; 412 ep = *epp; 413 while (ep) { 414 if ((ep->function == function) && (ep->arg == arg)) { 415 *epp = ep->next; 416 free(ep, M_TEMP); 417 count++; 418 } else { 419 epp = &ep->next; 420 } 421 ep = *epp; 422 } 423 epp = &shutdown_list2; 424 ep = *epp; 425 while (ep) { 426 if ((ep->function == function) && (ep->arg == arg)) { 427 *epp = ep->next; 428 free(ep, M_TEMP); 429 count++; 430 } else { 431 epp = &ep->next; 432 } 433 ep = *epp; 434 } 435 return (count); 436} 437 438