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 1.7 1996/09/13 09:17:06 bde 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 84 SYSCTL_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 */ 93 const char *panicstr; 94 95 /* 96 * callout list for things to do a shutdown 97 */ 98 typedef 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 */ 108 static sle_p shutdown_list1; 109 static sle_p shutdown_list2; 110 111 112 static void dumpsys(void); 113 114 #ifndef _SYS_SYSPROTO_H_ 115 struct reboot_args { 116 int opt; 117 }; 118 #endif 119 /* ARGSUSED */ 120 121 /* 122 * The system call that results in a reboot 123 */ 124 int 125 reboot(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 */ 142 void 143 shutdown_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 } 154 static int waittime = -1; 155 static 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 */ 162 void 163 boot(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 /* Did user type a key? */ 249 if (cncheckc() != -1) 250 break; 251 } 252 if (!loop) 253 goto die; 254 } 255 } else { /* zero time specified - reboot NOW */ 256 goto die; 257 } 258 printf("--> Press a key on the console to reboot <--\n"); 259 cngetc(); 260 } 261 } 262 die: 263 printf("Rebooting...\n"); 264 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 265 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 266 cpu_reset(); 267 for(;;) ; 268 /* NOTREACHED */ 269 } 270 271 /* 272 * Magic number for savecore 273 * 274 * exported (symorder) and used at least by savecore(8) 275 * 276 */ 277 static u_long const dumpmag = 0x8fca0101UL; 278 279 static int dumpsize = 0; /* also for savecore */ 280 281 static int dodump = 1; 282 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); 283 284 /* 285 * Doadump comes here after turning off memory management and 286 * getting on the dump stack, either when called above, or by 287 * the auto-restart code. 288 */ 289 static void 290 dumpsys(void) 291 { 292 293 if (!dodump) 294 return; 295 if (dumpdev == NODEV) 296 return; 297 if ((minor(dumpdev)&07) != 1) 298 return; 299 if (!(bdevsw[major(dumpdev)])) 300 return; 301 if (!(bdevsw[major(dumpdev)]->d_dump)) 302 return; 303 dumpsize = Maxmem; 304 printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); 305 printf("dump "); 306 switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { 307 308 case ENXIO: 309 printf("device bad\n"); 310 break; 311 312 case EFAULT: 313 printf("device not ready\n"); 314 break; 315 316 case EINVAL: 317 printf("area improper\n"); 318 break; 319 320 case EIO: 321 printf("i/o error\n"); 322 break; 323 324 case EINTR: 325 printf("aborted from console\n"); 326 break; 327 328 default: 329 printf("succeeded\n"); 330 break; 331 } 332 } 333 334 /* 335 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 336 * and then reboots. If we are called twice, then we avoid trying to sync 337 * the disks as this often leads to recursive panics. 338 */ 339 void 340 panic(const char *fmt, ...) 341 { 342 int bootopt; 343 va_list ap; 344 345 bootopt = RB_AUTOBOOT | RB_DUMP; 346 if (panicstr) 347 bootopt |= RB_NOSYNC; 348 else 349 panicstr = fmt; 350 351 printf("panic: "); 352 va_start(ap, fmt); 353 vprintf(fmt, ap); 354 va_end(ap); 355 printf("\n"); 356 357 #if defined(DDB) 358 if (debugger_on_panic) 359 Debugger ("panic"); 360 #endif 361 boot(bootopt); 362 } 363 364 /* 365 * Two routines to handle adding/deleting items on the 366 * shutdown callout lists 367 * 368 * at_shutdown(): 369 * Take the arguments given and put them onto the shutdown callout list. 370 * However first make sure that it's not already there. 371 * returns 0 on success. 372 */ 373 int 374 at_shutdown(bootlist_fn function, void *arg, int position) 375 { 376 sle_p ep, *epp; 377 378 switch(position) { 379 case SHUTDOWN_PRE_SYNC: 380 epp = &shutdown_list1; 381 break; 382 case SHUTDOWN_POST_SYNC: 383 epp = &shutdown_list2; 384 break; 385 default: 386 printf("bad exit callout list specified\n"); 387 return (EINVAL); 388 } 389 if (rm_at_shutdown(function, arg)) 390 printf("exit callout entry already present\n"); 391 ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT); 392 if (ep == NULL) 393 return (ENOMEM); 394 ep->next = *epp; 395 ep->function = function; 396 ep->arg = arg; 397 *epp = ep; 398 return (0); 399 } 400 401 /* 402 * Scan the exit callout lists for the given items and remove them. 403 * Returns the number of items removed. 404 */ 405 int 406 rm_at_shutdown(bootlist_fn function, void *arg) 407 { 408 sle_p *epp, ep; 409 int count; 410 411 count = 0; 412 epp = &shutdown_list1; 413 ep = *epp; 414 while (ep) { 415 if ((ep->function == function) && (ep->arg == arg)) { 416 *epp = ep->next; 417 free(ep, M_TEMP); 418 count++; 419 } else { 420 epp = &ep->next; 421 } 422 ep = *epp; 423 } 424 epp = &shutdown_list2; 425 ep = *epp; 426 while (ep) { 427 if ((ep->function == function) && (ep->arg == arg)) { 428 *epp = ep->next; 429 free(ep, M_TEMP); 430 count++; 431 } else { 432 epp = &ep->next; 433 } 434 ep = *epp; 435 } 436 return (count); 437 } 438 439