kern_shutdown.c revision 21776
117658Sjulian/*- 217658Sjulian * Copyright (c) 1986, 1988, 1991, 1993 317658Sjulian * The Regents of the University of California. All rights reserved. 417658Sjulian * (c) UNIX System Laboratories, Inc. 517658Sjulian * All or some portions of this file are derived from material licensed 617658Sjulian * to the University of California by American Telephone and Telegraph 717658Sjulian * Co. or Unix System Laboratories, Inc. and are reproduced herein with 817658Sjulian * the permission of UNIX System Laboratories, Inc. 917658Sjulian * 1017658Sjulian * Redistribution and use in source and binary forms, with or without 1117658Sjulian * modification, are permitted provided that the following conditions 1217658Sjulian * are met: 1317658Sjulian * 1. Redistributions of source code must retain the above copyright 1417658Sjulian * notice, this list of conditions and the following disclaimer. 1517658Sjulian * 2. Redistributions in binary form must reproduce the above copyright 1617658Sjulian * notice, this list of conditions and the following disclaimer in the 1717658Sjulian * documentation and/or other materials provided with the distribution. 1817658Sjulian * 3. All advertising materials mentioning features or use of this software 1917658Sjulian * must display the following acknowledgement: 2017658Sjulian * This product includes software developed by the University of 2117658Sjulian * California, Berkeley and its contributors. 2217658Sjulian * 4. Neither the name of the University nor the names of its contributors 2317658Sjulian * may be used to endorse or promote products derived from this software 2417658Sjulian * without specific prior written permission. 2517658Sjulian * 2617658Sjulian * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2717658Sjulian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2817658Sjulian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2917658Sjulian * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3017658Sjulian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3117658Sjulian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3217658Sjulian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3317658Sjulian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3417658Sjulian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3517658Sjulian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3617658Sjulian * SUCH DAMAGE. 3717658Sjulian * 3817658Sjulian * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 3921673Sjkh * $FreeBSD: head/sys/kern/kern_shutdown.c 21776 1997-01-16 15:58:32Z bde $ 4017658Sjulian */ 4117658Sjulian 4217658Sjulian#include "opt_ddb.h" 4317658Sjulian 4417658Sjulian#include <sys/param.h> 4517658Sjulian#include <sys/systm.h> 4617658Sjulian#include <sys/reboot.h> 4717658Sjulian#include <sys/msgbuf.h> 4817658Sjulian#include <sys/proc.h> 4917658Sjulian#include <sys/vnode.h> 5017658Sjulian#include <sys/tty.h> 5117658Sjulian#include <sys/tprintf.h> 5217658Sjulian#include <sys/syslog.h> 5317658Sjulian#include <sys/malloc.h> 5417658Sjulian#include <sys/kernel.h> 5521776Sbde#include <sys/mount.h> 5617658Sjulian#include <sys/sysctl.h> 5717658Sjulian#include <sys/conf.h> 5817658Sjulian#include <sys/sysproto.h> 5917658Sjulian 6017658Sjulian#include <machine/pcb.h> 6117658Sjulian#include <machine/clock.h> 6217658Sjulian#include <machine/cons.h> 6317658Sjulian#include <machine/md_var.h> 6417658Sjulian 6517658Sjulian#include <sys/utsname.h> 6617658Sjulian#include <sys/signalvar.h> 6717658Sjulian 6817658Sjulian#ifndef PANIC_REBOOT_WAIT_TIME 6917658Sjulian#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 7017658Sjulian#endif 7117658Sjulian 7217658Sjulian/* 7317658Sjulian * Note that stdarg.h and the ANSI style va_start macro is used for both 7417658Sjulian * ANSI and traditional C compilers. 7517658Sjulian */ 7617658Sjulian#include <machine/stdarg.h> 7717658Sjulian 7817658Sjulian#if defined(DDB) 7917658Sjulian#ifdef DDB_UNATTENDED 8017658Sjulian static int debugger_on_panic = 0; 8117658Sjulian#else 8217658Sjulian static int debugger_on_panic = 1; 8317658Sjulian#endif 8417658Sjulian 8517658SjulianSYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 8617658Sjulian &debugger_on_panic, 0, ""); 8717658Sjulian#endif 8817658Sjulian 8917658Sjulian 9017658Sjulian/* 9117658Sjulian * Variable panicstr contains argument to first call to panic; used as flag 9217658Sjulian * to indicate that the kernel has already called panic. 9317658Sjulian */ 9417658Sjulianconst char *panicstr; 9517658Sjulian 9617658Sjulian/* 9717658Sjulian * callout list for things to do a shutdown 9817658Sjulian */ 9917658Sjuliantypedef struct shutdown_list_element { 10017658Sjulian struct shutdown_list_element *next; 10117658Sjulian bootlist_fn function; 10217658Sjulian void *arg; 10317658Sjulian} *sle_p; 10417658Sjulian 10517768Sjulian/* 10617768Sjulian * there are two shutdown lists. Some things need to be shut down 10717768Sjulian * Earlier than others. 10817768Sjulian */ 10917768Sjulianstatic sle_p shutdown_list1; 11017768Sjulianstatic sle_p shutdown_list2; 11117658Sjulian 11217658Sjulian 11317658Sjulianstatic void dumpsys(void); 11417658Sjulian 11517658Sjulian#ifndef _SYS_SYSPROTO_H_ 11617658Sjulianstruct reboot_args { 11717658Sjulian int opt; 11817658Sjulian}; 11917658Sjulian#endif 12017658Sjulian/* ARGSUSED */ 12117658Sjulian 12217658Sjulian/* 12317658Sjulian * The system call that results in a reboot 12417658Sjulian */ 12517658Sjulianint 12617658Sjulianreboot(p, uap, retval) 12717658Sjulian struct proc *p; 12817658Sjulian struct reboot_args *uap; 12917658Sjulian int *retval; 13017658Sjulian{ 13117658Sjulian int error; 13217658Sjulian 13317658Sjulian if ((error = suser(p->p_ucred, &p->p_acflag))) 13417658Sjulian return (error); 13517658Sjulian 13617658Sjulian boot(uap->opt); 13717658Sjulian return (0); 13817658Sjulian} 13917658Sjulian 14017658Sjulian/* 14117658Sjulian * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 14217658Sjulian */ 14317658Sjulianvoid 14417658Sjulianshutdown_nice(void) 14517658Sjulian{ 14617658Sjulian /* Send a signal to init(8) and have it shutdown the world */ 14717658Sjulian if (initproc != NULL) { 14817658Sjulian psignal(initproc, SIGINT); 14917658Sjulian } else { 15017658Sjulian /* No init(8) running, so simply reboot */ 15117658Sjulian boot(RB_NOSYNC); 15217658Sjulian } 15317658Sjulian return; 15417658Sjulian} 15517658Sjulianstatic int waittime = -1; 15617658Sjulianstatic struct pcb dumppcb; 15717658Sjulian 15817658Sjulian/* 15917658Sjulian * Go through the rigmarole of shutting down.. 16017658Sjulian * this used to be in machdep.c but I'll be dammned if I could see 16117658Sjulian * anything machine dependant in it. 16217658Sjulian */ 16318277Sbdevoid 16417658Sjulianboot(howto) 16517658Sjulian int howto; 16617658Sjulian{ 16717768Sjulian sle_p ep; 16817658Sjulian 16917768Sjulian ep = shutdown_list1; 17017768Sjulian while (ep) { 17117768Sjulian shutdown_list1 = ep->next; 17217658Sjulian (*ep->function)(howto, ep->arg); 17317658Sjulian ep = ep->next; 17417658Sjulian } 17517658Sjulian if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 17617658Sjulian register struct buf *bp; 17717658Sjulian int iter, nbusy; 17817658Sjulian 17917658Sjulian waittime = 0; 18017658Sjulian printf("\nsyncing disks... "); 18117658Sjulian 18217658Sjulian sync(&proc0, NULL, NULL); 18317658Sjulian 18417658Sjulian for (iter = 0; iter < 20; iter++) { 18517658Sjulian nbusy = 0; 18617658Sjulian for (bp = &buf[nbuf]; --bp >= buf; ) { 18717658Sjulian if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 18817658Sjulian nbusy++; 18917658Sjulian } 19017658Sjulian } 19117658Sjulian if (nbusy == 0) 19217658Sjulian break; 19317658Sjulian printf("%d ", nbusy); 19417658Sjulian DELAY(40000 * iter); 19517658Sjulian } 19617658Sjulian if (nbusy) { 19717658Sjulian /* 19817658Sjulian * Failed to sync all blocks. Indicate this and don't 19917658Sjulian * unmount filesystems (thus forcing an fsck on reboot). 20017658Sjulian */ 20117658Sjulian printf("giving up\n"); 20217658Sjulian#ifdef SHOW_BUSYBUFS 20317658Sjulian nbusy = 0; 20417658Sjulian for (bp = &buf[nbuf]; --bp >= buf; ) { 20517658Sjulian if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 20617658Sjulian nbusy++; 20717658Sjulian printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno); 20817658Sjulian } 20917658Sjulian } 21017658Sjulian DELAY(5000000); /* 5 seconds */ 21117658Sjulian#endif 21217658Sjulian } else { 21317658Sjulian printf("done\n"); 21417658Sjulian /* 21517658Sjulian * Unmount filesystems 21617658Sjulian */ 21717658Sjulian if (panicstr == 0) 21817658Sjulian vfs_unmountall(); 21917658Sjulian } 22017658Sjulian DELAY(100000); /* wait for console output to finish */ 22117658Sjulian } 22217768Sjulian ep = shutdown_list2; 22317768Sjulian while (ep) { 22417768Sjulian shutdown_list2 = ep->next; 22517768Sjulian (*ep->function)(howto, ep->arg); 22617768Sjulian ep = ep->next; 22717768Sjulian } 22817658Sjulian splhigh(); 22917658Sjulian if (howto & RB_HALT) { 23017658Sjulian printf("\n"); 23117658Sjulian printf("The operating system has halted.\n"); 23217658Sjulian printf("Please press any key to reboot.\n\n"); 23319274Sjulian switch (cngetc()) { 23419274Sjulian case -1: /* No console, just die */ 23519274Sjulian cpu_halt(); 23619274Sjulian /* NOTREACHED */ 23719274Sjulian default: 23819274Sjulian break; 23919274Sjulian } 24017658Sjulian } else { 24117658Sjulian if (howto & RB_DUMP) { 24217658Sjulian if (!cold) { 24317658Sjulian savectx(&dumppcb); 24417658Sjulian dumppcb.pcb_cr3 = rcr3(); 24517658Sjulian dumpsys(); 24617658Sjulian } 24717658Sjulian 24817658Sjulian if (PANIC_REBOOT_WAIT_TIME != 0) { 24917658Sjulian if (PANIC_REBOOT_WAIT_TIME != -1) { 25017658Sjulian int loop; 25117658Sjulian printf("Automatic reboot in %d seconds - press a key on the console to abort\n", 25217658Sjulian PANIC_REBOOT_WAIT_TIME); 25317658Sjulian for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { 25417658Sjulian DELAY(1000 * 100); /* 1/10th second */ 25518290Sbde /* Did user type a key? */ 25618290Sbde if (cncheckc() != -1) 25717658Sjulian break; 25817658Sjulian } 25917658Sjulian if (!loop) 26017658Sjulian goto die; 26117658Sjulian } 26217658Sjulian } else { /* zero time specified - reboot NOW */ 26317658Sjulian goto die; 26417658Sjulian } 26517658Sjulian printf("--> Press a key on the console to reboot <--\n"); 26617658Sjulian cngetc(); 26717658Sjulian } 26817658Sjulian } 26917658Sjuliandie: 27017658Sjulian printf("Rebooting...\n"); 27117658Sjulian DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 27217677Sjulian /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 27317658Sjulian cpu_reset(); 27417658Sjulian for(;;) ; 27517658Sjulian /* NOTREACHED */ 27617658Sjulian} 27717658Sjulian 27817658Sjulian/* 27917658Sjulian * Magic number for savecore 28017658Sjulian * 28117658Sjulian * exported (symorder) and used at least by savecore(8) 28217658Sjulian * 28317658Sjulian */ 28417658Sjulianstatic u_long const dumpmag = 0x8fca0101UL; 28517658Sjulian 28617658Sjulianstatic int dumpsize = 0; /* also for savecore */ 28717658Sjulian 28817658Sjulianstatic int dodump = 1; 28917658SjulianSYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); 29017658Sjulian 29117658Sjulian/* 29217658Sjulian * Doadump comes here after turning off memory management and 29317658Sjulian * getting on the dump stack, either when called above, or by 29417658Sjulian * the auto-restart code. 29517658Sjulian */ 29617658Sjulianstatic void 29717658Sjuliandumpsys(void) 29817658Sjulian{ 29917658Sjulian 30017658Sjulian if (!dodump) 30117658Sjulian return; 30217658Sjulian if (dumpdev == NODEV) 30317658Sjulian return; 30417658Sjulian if ((minor(dumpdev)&07) != 1) 30517658Sjulian return; 30617658Sjulian if (!(bdevsw[major(dumpdev)])) 30717658Sjulian return; 30817658Sjulian if (!(bdevsw[major(dumpdev)]->d_dump)) 30917658Sjulian return; 31017658Sjulian dumpsize = Maxmem; 31117658Sjulian printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); 31217658Sjulian printf("dump "); 31317658Sjulian switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { 31417658Sjulian 31517658Sjulian case ENXIO: 31617658Sjulian printf("device bad\n"); 31717658Sjulian break; 31817658Sjulian 31917658Sjulian case EFAULT: 32017658Sjulian printf("device not ready\n"); 32117658Sjulian break; 32217658Sjulian 32317658Sjulian case EINVAL: 32417658Sjulian printf("area improper\n"); 32517658Sjulian break; 32617658Sjulian 32717658Sjulian case EIO: 32817658Sjulian printf("i/o error\n"); 32917658Sjulian break; 33017658Sjulian 33117658Sjulian case EINTR: 33217658Sjulian printf("aborted from console\n"); 33317658Sjulian break; 33417658Sjulian 33517658Sjulian default: 33617658Sjulian printf("succeeded\n"); 33717658Sjulian break; 33817658Sjulian } 33917658Sjulian} 34017658Sjulian 34117658Sjulian/* 34217658Sjulian * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 34317658Sjulian * and then reboots. If we are called twice, then we avoid trying to sync 34417658Sjulian * the disks as this often leads to recursive panics. 34517658Sjulian */ 34617658Sjulianvoid 34717658Sjulianpanic(const char *fmt, ...) 34817658Sjulian{ 34917658Sjulian int bootopt; 35017658Sjulian va_list ap; 35117658Sjulian 35217658Sjulian bootopt = RB_AUTOBOOT | RB_DUMP; 35317658Sjulian if (panicstr) 35417658Sjulian bootopt |= RB_NOSYNC; 35517658Sjulian else 35617658Sjulian panicstr = fmt; 35717658Sjulian 35817658Sjulian printf("panic: "); 35917658Sjulian va_start(ap, fmt); 36017658Sjulian vprintf(fmt, ap); 36117658Sjulian va_end(ap); 36217658Sjulian printf("\n"); 36317658Sjulian 36417658Sjulian#if defined(DDB) 36517658Sjulian if (debugger_on_panic) 36617658Sjulian Debugger ("panic"); 36717658Sjulian#endif 36817658Sjulian boot(bootopt); 36917658Sjulian} 37017658Sjulian 37117768Sjulian/* 37217768Sjulian * Two routines to handle adding/deleting items on the 37317768Sjulian * shutdown callout lists 37417768Sjulian * 37517768Sjulian * at_shutdown(): 37617658Sjulian * Take the arguments given and put them onto the shutdown callout list. 37717658Sjulian * However first make sure that it's not already there. 37817658Sjulian * returns 0 on success. 37917658Sjulian */ 38017658Sjulianint 38117768Sjulianat_shutdown(bootlist_fn function, void *arg, int position) 38217658Sjulian{ 38317768Sjulian sle_p ep, *epp; 38417768Sjulian 38517768Sjulian switch(position) { 38617768Sjulian case SHUTDOWN_PRE_SYNC: 38717768Sjulian epp = &shutdown_list1; 38817768Sjulian break; 38917768Sjulian case SHUTDOWN_POST_SYNC: 39017768Sjulian epp = &shutdown_list2; 39117768Sjulian break; 39217768Sjulian default: 39317768Sjulian printf("bad exit callout list specified\n"); 39417768Sjulian return (EINVAL); 39517768Sjulian } 39617768Sjulian if (rm_at_shutdown(function, arg)) 39717658Sjulian printf("exit callout entry already present\n"); 39817768Sjulian ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT); 39917768Sjulian if (ep == NULL) 40017768Sjulian return (ENOMEM); 40117768Sjulian ep->next = *epp; 40217658Sjulian ep->function = function; 40317658Sjulian ep->arg = arg; 40417768Sjulian *epp = ep; 40517768Sjulian return (0); 40617658Sjulian} 40717768Sjulian 40817658Sjulian/* 40917768Sjulian * Scan the exit callout lists for the given items and remove them. 41017658Sjulian * Returns the number of items removed. 41117658Sjulian */ 41217658Sjulianint 41317658Sjulianrm_at_shutdown(bootlist_fn function, void *arg) 41417658Sjulian{ 41517768Sjulian sle_p *epp, ep; 41617768Sjulian int count; 41717658Sjulian 41817768Sjulian count = 0; 41917768Sjulian epp = &shutdown_list1; 42017658Sjulian ep = *epp; 42117768Sjulian while (ep) { 42217834Sjulian if ((ep->function == function) && (ep->arg == arg)) { 42317658Sjulian *epp = ep->next; 42417768Sjulian free(ep, M_TEMP); 42517658Sjulian count++; 42617658Sjulian } else { 42717658Sjulian epp = &ep->next; 42817658Sjulian } 42917658Sjulian ep = *epp; 43017658Sjulian } 43117768Sjulian epp = &shutdown_list2; 43217768Sjulian ep = *epp; 43317768Sjulian while (ep) { 43417834Sjulian if ((ep->function == function) && (ep->arg == arg)) { 43517768Sjulian *epp = ep->next; 43617768Sjulian free(ep, M_TEMP); 43717768Sjulian count++; 43817768Sjulian } else { 43917768Sjulian epp = &ep->next; 44017768Sjulian } 44117768Sjulian ep = *epp; 44217768Sjulian } 44317768Sjulian return (count); 44417658Sjulian} 44517658Sjulian 446