Fix missing initialisation of big numbers. BN_hex2bn behaves
[dragonfly.git] / sys / kern / kern_shutdown.c
CommitLineData
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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 * $FreeBSD: src/sys/kern/kern_shutdown.c,v 1.72.2.12 2002/02/21 19:15:10 dillon Exp $
9ec81f83 40 * $DragonFly: src/sys/kern/kern_shutdown.c,v 1.20 2005/06/16 17:55:06 dillon Exp $
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41 */
42
43#include "opt_ddb.h"
b1e04573 44#include "opt_ddb_trace.h"
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45#include "opt_hw_wdog.h"
46#include "opt_panic.h"
47#include "opt_show_busybufs.h"
48
49#include <sys/param.h>
50#include <sys/systm.h>
51#include <sys/eventhandler.h>
52#include <sys/buf.h>
53#include <sys/disklabel.h>
54#include <sys/reboot.h>
55#include <sys/proc.h>
56#include <sys/vnode.h>
57#include <sys/kernel.h>
58#include <sys/kthread.h>
59#include <sys/malloc.h>
60#include <sys/mount.h>
61#include <sys/queue.h>
62#include <sys/sysctl.h>
63#include <sys/conf.h>
64#include <sys/sysproto.h>
335dda38 65#include <sys/device.h>
984263bc 66#include <sys/cons.h>
9ec81f83 67#include <sys/thread2.h>
3020e3be 68#include <sys/buf2.h>
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69
70#include <machine/pcb.h>
71#include <machine/clock.h>
72#include <machine/md_var.h>
0f7a3396 73#include <machine/smp.h> /* smp_active_mask, cpuid */
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74
75#include <sys/signalvar.h>
76
77#ifndef PANIC_REBOOT_WAIT_TIME
78#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
79#endif
80
81/*
82 * Note that stdarg.h and the ANSI style va_start macro is used for both
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83 * ANSI and traditional C compilers. We use the machine version to stay
84 * within the confines of the kernel header files.
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85 */
86#include <machine/stdarg.h>
87
88#ifdef DDB
89#ifdef DDB_UNATTENDED
90int debugger_on_panic = 0;
91#else
92int debugger_on_panic = 1;
93#endif
94SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
95 &debugger_on_panic, 0, "Run debugger on kernel panic");
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96
97extern void db_print_backtrace(void);
98
99#ifdef DDB_TRACE
100int trace_on_panic = 1;
101#else
102int trace_on_panic = 0;
103#endif
104SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
105 &trace_on_panic, 0, "Print stack trace on kernel panic");
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106#endif
107
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108static int sync_on_panic = 1;
109SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
110 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
111
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112SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
113
114#ifdef HW_WDOG
115/*
116 * If there is a hardware watchdog, point this at the function needed to
117 * hold it off.
118 * It's needed when the kernel needs to do some lengthy operations.
119 * e.g. in wd.c when dumping core.. It's most annoying to have
120 * your precious core-dump only half written because the wdog kicked in.
121 */
122watchdog_tickle_fn wdog_tickler = NULL;
123#endif /* HW_WDOG */
124
125/*
126 * Variable panicstr contains argument to first call to panic; used as flag
127 * to indicate that the kernel has already called panic.
128 */
129const char *panicstr;
130
131int dumping; /* system is dumping */
132
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133static void boot (int) __dead2;
134static void dumpsys (void);
135static int setdumpdev (dev_t dev);
136static void poweroff_wait (void *, int);
137static void print_uptime (void);
138static void shutdown_halt (void *junk, int howto);
139static void shutdown_panic (void *junk, int howto);
140static void shutdown_reset (void *junk, int howto);
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141
142/* register various local shutdown events */
143static void
144shutdown_conf(void *unused)
145{
146 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
147 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
148 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
149 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
150}
151
152SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
153
154/* ARGSUSED */
155
156/*
157 * The system call that results in a reboot
158 */
159int
41c20dac 160reboot(struct reboot_args *uap)
984263bc 161{
dadab5e9 162 struct thread *td = curthread;
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163 int error;
164
dadab5e9 165 if ((error = suser(td)))
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166 return (error);
167
168 boot(uap->opt);
169 return (0);
170}
171
172/*
173 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
174 */
175static int shutdown_howto = 0;
176
177void
178shutdown_nice(int howto)
179{
180 shutdown_howto = howto;
181
182 /* Send a signal to init(8) and have it shutdown the world */
183 if (initproc != NULL) {
184 psignal(initproc, SIGINT);
185 } else {
186 /* No init(8) running, so simply reboot */
187 boot(RB_NOSYNC);
188 }
189 return;
190}
191static int waittime = -1;
192static struct pcb dumppcb;
193
194static void
195print_uptime()
196{
197 int f;
198 struct timespec ts;
199
200 getnanouptime(&ts);
201 printf("Uptime: ");
202 f = 0;
203 if (ts.tv_sec >= 86400) {
204 printf("%ldd", ts.tv_sec / 86400);
205 ts.tv_sec %= 86400;
206 f = 1;
207 }
208 if (f || ts.tv_sec >= 3600) {
209 printf("%ldh", ts.tv_sec / 3600);
210 ts.tv_sec %= 3600;
211 f = 1;
212 }
213 if (f || ts.tv_sec >= 60) {
214 printf("%ldm", ts.tv_sec / 60);
215 ts.tv_sec %= 60;
216 f = 1;
217 }
218 printf("%lds\n", ts.tv_sec);
219}
220
221/*
222 * Go through the rigmarole of shutting down..
223 * this used to be in machdep.c but I'll be dammned if I could see
224 * anything machine dependant in it.
225 */
226static void
41c20dac 227boot(int howto)
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228{
229
230 /* collect extra flags that shutdown_nice might have set */
231 howto |= shutdown_howto;
232
233#ifdef SMP
0f7a3396 234 if (smp_active_mask > 1) {
72740893 235 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
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236 }
237#endif
238 /*
239 * Do any callouts that should be done BEFORE syncing the filesystems.
240 */
241 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
242
243 /*
244 * Now sync filesystems
245 */
246 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
1fd87d54 247 struct buf *bp;
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248 int iter, nbusy, pbusy;
249
250 waittime = 0;
251 printf("\nsyncing disks... ");
252
41c20dac 253 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
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254
255 /*
256 * With soft updates, some buffers that are
257 * written will be remarked as dirty until other
258 * buffers are written.
259 */
260 for (iter = pbusy = 0; iter < 20; iter++) {
261 nbusy = 0;
262 for (bp = &buf[nbuf]; --bp >= buf; ) {
263 if ((bp->b_flags & B_INVAL) == 0 &&
264 BUF_REFCNT(bp) > 0) {
265 nbusy++;
266 } else if ((bp->b_flags & (B_DELWRI | B_INVAL))
267 == B_DELWRI) {
268 /* bawrite(bp);*/
269 nbusy++;
270 }
271 }
272 if (nbusy == 0)
273 break;
274 printf("%d ", nbusy);
275 if (nbusy < pbusy)
276 iter = 0;
277 pbusy = nbusy;
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278 /*
279 * XXX:
280 * Process soft update work queue if buffers don't sync
281 * after 6 iterations by permitting the syncer to run.
282 */
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283 if (iter > 5 && bioops.io_sync)
284 (*bioops.io_sync)(NULL);
41c20dac 285 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
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286 DELAY(50000 * iter);
287 }
288 printf("\n");
289 /*
290 * Count only busy local buffers to prevent forcing
291 * a fsck if we're just a client of a wedged NFS server
292 */
293 nbusy = 0;
294 for (bp = &buf[nbuf]; --bp >= buf; ) {
295 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
296 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
297 if (bp->b_dev == NODEV) {
861905fb 298 mountlist_remove(bp->b_vp->v_mount);
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299 continue;
300 }
301 nbusy++;
302#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
303 printf(
304 "%p %d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n",
305 bp, nbusy, devtoname(bp->b_dev),
306 bp->b_flags, (long)bp->b_blkno,
307 (long)bp->b_lblkno);
308#endif
309 }
310 }
311 if (nbusy) {
312 /*
313 * Failed to sync all blocks. Indicate this and don't
314 * unmount filesystems (thus forcing an fsck on reboot).
315 */
316 printf("giving up on %d buffers\n", nbusy);
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317#ifdef DDB
318 Debugger("busy buffer problem");
319#endif /* DDB */
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320 DELAY(5000000); /* 5 seconds */
321 } else {
322 printf("done\n");
323 /*
324 * Unmount filesystems
325 */
326 if (panicstr == 0)
327 vfs_unmountall();
328 }
329 DELAY(100000); /* wait for console output to finish */
330 }
331
332 print_uptime();
333
334 /*
335 * Ok, now do things that assume all filesystem activity has
336 * been completed.
337 */
338 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
9ec81f83 339 crit_enter();
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340 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold)
341 dumpsys();
342
343 /* Now that we're going to really halt the system... */
344 EVENTHANDLER_INVOKE(shutdown_final, howto);
345
346 for(;;) ; /* safety against shutdown_reset not working */
347 /* NOTREACHED */
348}
349
350/*
351 * If the shutdown was a clean halt, behave accordingly.
352 */
353static void
354shutdown_halt(void *junk, int howto)
355{
356 if (howto & RB_HALT) {
357 printf("\n");
358 printf("The operating system has halted.\n");
359 printf("Please press any key to reboot.\n\n");
360 switch (cngetc()) {
361 case -1: /* No console, just die */
362 cpu_halt();
363 /* NOTREACHED */
364 default:
365 howto &= ~RB_HALT;
366 break;
367 }
368 }
369}
370
371/*
372 * Check to see if the system paniced, pause and then reboot
373 * according to the specified delay.
374 */
375static void
376shutdown_panic(void *junk, int howto)
377{
378 int loop;
379
380 if (howto & RB_DUMP) {
381 if (PANIC_REBOOT_WAIT_TIME != 0) {
382 if (PANIC_REBOOT_WAIT_TIME != -1) {
383 printf("Automatic reboot in %d seconds - "
384 "press a key on the console to abort\n",
385 PANIC_REBOOT_WAIT_TIME);
386 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
387 loop > 0; --loop) {
388 DELAY(1000 * 100); /* 1/10th second */
389 /* Did user type a key? */
390 if (cncheckc() != -1)
391 break;
392 }
393 if (!loop)
394 return;
395 }
396 } else { /* zero time specified - reboot NOW */
397 return;
398 }
399 printf("--> Press a key on the console to reboot,\n");
400 printf("--> or switch off the system now.\n");
401 cngetc();
402 }
403}
404
405/*
406 * Everything done, now reset
407 */
408static void
409shutdown_reset(void *junk, int howto)
410{
411 printf("Rebooting...\n");
412 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
413 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
414 cpu_reset();
415 /* NOTREACHED */ /* assuming reset worked */
416}
417
418/*
419 * Magic number for savecore
420 *
421 * exported (symorder) and used at least by savecore(8)
422 *
423 */
424static u_long const dumpmag = 0x8fca0101UL;
425
426static int dumpsize = 0; /* also for savecore */
427
428static int dodump = 1;
429
430SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
431 "Try to perform coredump on kernel panic");
432
433static int
434setdumpdev(dev)
435 dev_t dev;
436{
437 int psize;
438 long newdumplo;
439
440 if (dev == NODEV) {
441 dumpdev = dev;
442 return (0);
443 }
335dda38 444 psize = dev_dpsize(dev);
984263bc 445 if (psize == -1)
335dda38 446 return (ENXIO);
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447 /*
448 * XXX should clean up checking in dumpsys() to be more like this.
449 */
450 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE);
451 if (newdumplo <= LABELSECTOR)
452 return (ENOSPC);
453 dumpdev = dev;
454 dumplo = newdumplo;
455 return (0);
456}
457
458
459/* ARGSUSED */
402ed7e1 460static void dump_conf (void *dummy);
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461static void
462dump_conf(dummy)
463 void *dummy;
464{
465 char *path;
466 dev_t dev;
467
468 path = malloc(MNAMELEN, M_TEMP, M_WAITOK);
469 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
470 dev = getdiskbyname(path);
471 if (dev != NODEV)
472 dumpdev = dev;
473 }
474 free(path, M_TEMP);
475 if (setdumpdev(dumpdev) != 0)
476 dumpdev = NODEV;
477}
478
479SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
480
481static int
482sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
483{
484 int error;
485 udev_t ndumpdev;
486
487 ndumpdev = dev2udev(dumpdev);
488 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
489 if (error == 0 && req->newptr != NULL)
490 error = setdumpdev(udev2dev(ndumpdev, 0));
491 return (error);
492}
493
494SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
495 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
496
497/*
498 * Doadump comes here after turning off memory management and
499 * getting on the dump stack, either when called above, or by
500 * the auto-restart code.
501 */
502static void
503dumpsys(void)
504{
505 int error;
506
507 savectx(&dumppcb);
508 if (dumping++) {
509 printf("Dump already in progress, bailing...\n");
510 return;
511 }
512 if (!dodump)
513 return;
514 if (dumpdev == NODEV)
515 return;
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516 dumpsize = Maxmem;
517 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo);
518 printf("dump ");
335dda38 519 error = dev_ddump(dumpdev);
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520 if (error == 0) {
521 printf("succeeded\n");
522 return;
523 }
524 printf("failed, reason: ");
525 switch (error) {
335dda38 526 case ENOSYS:
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527 case ENODEV:
528 printf("device doesn't support a dump routine\n");
529 break;
530
531 case ENXIO:
532 printf("device bad\n");
533 break;
534
535 case EFAULT:
536 printf("device not ready\n");
537 break;
538
539 case EINVAL:
540 printf("area improper\n");
541 break;
542
543 case EIO:
544 printf("i/o error\n");
545 break;
546
547 case EINTR:
548 printf("aborted from console\n");
549 break;
550
551 default:
552 printf("unknown, error = %d\n", error);
553 break;
554 }
555}
556
557int
558dumpstatus(vm_offset_t addr, off_t count)
559{
560 int c;
561
562 if (addr % (1024 * 1024) == 0) {
563#ifdef HW_WDOG
564 if (wdog_tickler)
565 (*wdog_tickler)();
566#endif
567 printf("%ld ", (long)(count / (1024 * 1024)));
568 }
569
570 if ((c = cncheckc()) == 0x03)
571 return -1;
572 else if (c != -1)
573 printf("[CTRL-C to abort] ");
574
575 return 0;
576}
577
578/*
579 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
580 * and then reboots. If we are called twice, then we avoid trying to sync
581 * the disks as this often leads to recursive panics.
582 */
583void
584panic(const char *fmt, ...)
585{
b1e04573 586 int bootopt, newpanic;
e2565a42 587 __va_list ap;
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588 static char buf[256];
589
590 bootopt = RB_AUTOBOOT | RB_DUMP;
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591 if (sync_on_panic == 0)
592 bootopt |= RB_NOSYNC;
b1e04573 593 newpanic = 0;
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594 if (panicstr)
595 bootopt |= RB_NOSYNC;
b1e04573 596 else {
984263bc 597 panicstr = fmt;
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598 newpanic = 1;
599 }
984263bc 600
e2565a42 601 __va_start(ap, fmt);
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602 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
603 if (panicstr == fmt)
604 panicstr = buf;
e2565a42 605 __va_end(ap);
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606 printf("panic: %s\n", buf);
607#ifdef SMP
7a44d1cb 608 /* three separate prints in case of an unmapped page and trap */
984263bc 609 printf("mp_lock = %08x; ", mp_lock);
72740893 610 printf("cpuid = %d; ", mycpu->gd_cpuid);
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611 printf("lapic.id = %08x\n", lapic.id);
612#endif
613
614#if defined(DDB)
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615 if (newpanic && trace_on_panic)
616 db_print_backtrace();
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617 if (debugger_on_panic)
618 Debugger ("panic");
619#endif
620 boot(bootopt);
621}
622
623/*
624 * Support for poweroff delay.
625 */
626#ifndef POWEROFF_DELAY
627# define POWEROFF_DELAY 5000
628#endif
629static int poweroff_delay = POWEROFF_DELAY;
630
631SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
632 &poweroff_delay, 0, "");
633
634static void
635poweroff_wait(void *junk, int howto)
636{
637 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
638 return;
639 DELAY(poweroff_delay * 1000);
640}
641
642/*
643 * Some system processes (e.g. syncer) need to be stopped at appropriate
644 * points in their main loops prior to a system shutdown, so that they
645 * won't interfere with the shutdown process (e.g. by holding a disk buf
646 * to cause sync to fail). For each of these system processes, register
647 * shutdown_kproc() as a handler for one of shutdown events.
648 */
649static int kproc_shutdown_wait = 60;
650SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
651 &kproc_shutdown_wait, 0, "");
652
653void
654shutdown_kproc(void *arg, int howto)
655{
bc6dffab 656 struct thread *td;
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657 struct proc *p;
658 int error;
659
660 if (panicstr)
661 return;
662
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663 td = (struct thread *)arg;
664 if ((p = td->td_proc) != NULL) {
665 printf("Waiting (max %d seconds) for system process `%s' to stop...",
666 kproc_shutdown_wait, p->p_comm);
667 } else {
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668 printf("Waiting (max %d seconds) for system thread %s to stop...",
669 kproc_shutdown_wait, td->td_comm);
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670 }
671 error = suspend_kproc(td, kproc_shutdown_wait * hz);
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672
673 if (error == EWOULDBLOCK)
674 printf("timed out\n");
675 else
676 printf("stopped\n");
677}