ad4240fec4
called kern_shutdown.c note: I couldn't see anything machine dependant in the functions boot() and dumpsys() which were in machdep.c I have left a prototype for cpu_boot() which would go in machdep.c, but I have nothing to put in it. Iexpect others will let me know in no uncertain ways that this or that is machine dependant and should be there, but I'll way for that to happen.. :) I haven't actually taken the functions OUT of machdep or anywhere else yet.. I'm checking in this file so others can have a look at it and comment. SO PLEASE DO COMMENT! I am also (in another checkin) addinf a man(9) page for the new at_shotdown().. er freudian slip there.. at_shutdown() call so have a look at that (and at_exit and at_fork as well) and feed me comments.. I'll heck in the changes to make these (shutdown) changes active tomorrow if no-one objects too strongly..
430 lines
10 KiB
C
430 lines
10 KiB
C
/*-
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* Copyright (c) 1986, 1988, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
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* $Id: subr_prf.c,v 1.37 1996/05/09 18:58:06 gpalmer Exp $
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*/
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/reboot.h>
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#include <sys/msgbuf.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/tty.h>
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#include <sys/tprintf.h>
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#include <sys/syslog.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/devconf.h>
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#include <sys/conf.h>
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#include <sys/sysproto.h>
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#include <machine/pcb.h>
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#include <machine/clock.h>
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#include <machine/cons.h>
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#include <machine/md_var.h>
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#include <sys/utsname.h>
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#include <sys/signalvar.h>
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#ifndef PANIC_REBOOT_WAIT_TIME
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#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
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#endif
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/*
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* Note that stdarg.h and the ANSI style va_start macro is used for both
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* ANSI and traditional C compilers.
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*/
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#include <machine/stdarg.h>
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#if defined(DDB)
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#ifdef DDB_UNATTENDED
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static int debugger_on_panic = 0;
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#else
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static int debugger_on_panic = 1;
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#endif
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SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
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&debugger_on_panic, 0, "");
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#endif
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/*
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* Variable panicstr contains argument to first call to panic; used as flag
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* to indicate that the kernel has already called panic.
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*/
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const char *panicstr;
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/*
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* callout list for things to do a shutdown
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*/
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typedef struct shutdown_list_element {
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struct shutdown_list_element *next;
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bootlist_fn function;
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void *arg;
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} *sle_p;
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static sle_p shutdown_list;
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/* This implements a "TEXT_SET" for cleanup functions */
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static void dummy_cleanup __P((void));
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static void
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dummy_cleanup() {}
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TEXT_SET(cleanup_set, dummy_cleanup);
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typedef void (*cleanup_func_t)(void);
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extern const struct linker_set cleanup_set;
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static const cleanup_func_t *cleanups =
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(const cleanup_func_t *)&cleanup_set.ls_items[0];
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static void dumpsys(void);
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#ifndef _SYS_SYSPROTO_H_
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struct reboot_args {
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int opt;
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};
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#endif
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/* ARGSUSED */
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/*
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* The system call that results in a reboot
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*/
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int
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reboot(p, uap, retval)
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struct proc *p;
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struct reboot_args *uap;
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int *retval;
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{
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int error;
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if ((error = suser(p->p_ucred, &p->p_acflag)))
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return (error);
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boot(uap->opt);
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return (0);
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}
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/*
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* Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
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*/
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void
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shutdown_nice(void)
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{
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/* Send a signal to init(8) and have it shutdown the world */
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if (initproc != NULL) {
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psignal(initproc, SIGINT);
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} else {
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/* No init(8) running, so simply reboot */
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boot(RB_NOSYNC);
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}
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return;
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}
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static int waittime = -1;
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static struct pcb dumppcb;
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/*
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* Go through the rigmarole of shutting down..
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* this used to be in machdep.c but I'll be dammned if I could see
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* anything machine dependant in it.
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*/
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__dead void
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boot(howto)
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int howto;
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{
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sle_p ep = shutdown_list;
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/*
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* eventually the at_shutdown() method will totally replace the
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* linker set but for now leave them both (so 3rd partys
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* modules that might use it can not break).
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* The linker set is no good for LKMs etc.
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*/
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if ((howto & RB_NOSYNC) == 0 ) {
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printf("\ncleaning up... ");
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while(*cleanups) {
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printf("Using obsolete shutdown callout..\n");
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printf("update code to use at_shutdown()\n");
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(**cleanups++)();
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}
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}
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while(ep) {
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shutdown_list = ep->next;
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(*ep->function)(howto, ep->arg);
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ep = ep->next;
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}
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if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
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register struct buf *bp;
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int iter, nbusy;
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waittime = 0;
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printf("\nsyncing disks... ");
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sync(&proc0, NULL, NULL);
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for (iter = 0; iter < 20; iter++) {
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nbusy = 0;
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for (bp = &buf[nbuf]; --bp >= buf; ) {
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if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) {
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nbusy++;
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}
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}
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if (nbusy == 0)
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break;
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printf("%d ", nbusy);
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DELAY(40000 * iter);
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}
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if (nbusy) {
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/*
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* Failed to sync all blocks. Indicate this and don't
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* unmount filesystems (thus forcing an fsck on reboot).
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*/
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printf("giving up\n");
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#ifdef SHOW_BUSYBUFS
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nbusy = 0;
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for (bp = &buf[nbuf]; --bp >= buf; ) {
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if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) {
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nbusy++;
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printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno);
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}
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}
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DELAY(5000000); /* 5 seconds */
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#endif
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} else {
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printf("done\n");
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/*
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* Unmount filesystems
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*/
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if (panicstr == 0)
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vfs_unmountall();
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}
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DELAY(100000); /* wait for console output to finish */
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dev_shutdownall(FALSE);
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}
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splhigh();
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if (howto & RB_HALT) {
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printf("\n");
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printf("The operating system has halted.\n");
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printf("Please press any key to reboot.\n\n");
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cngetc();
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} else {
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if (howto & RB_DUMP) {
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if (!cold) {
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savectx(&dumppcb);
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dumppcb.pcb_cr3 = rcr3();
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dumpsys();
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}
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if (PANIC_REBOOT_WAIT_TIME != 0) {
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if (PANIC_REBOOT_WAIT_TIME != -1) {
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int loop;
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printf("Automatic reboot in %d seconds - press a key on the console to abort\n",
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PANIC_REBOOT_WAIT_TIME);
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for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) {
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DELAY(1000 * 100); /* 1/10th second */
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if (cncheckc()) /* Did user type a key? */
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break;
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}
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if (!loop)
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goto die;
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}
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} else { /* zero time specified - reboot NOW */
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goto die;
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}
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printf("--> Press a key on the console to reboot <--\n");
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cngetc();
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}
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}
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die:
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printf("Rebooting...\n");
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DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
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cpu_reset();
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for(;;) ;
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/* NOTREACHED */
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}
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/*
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* Magic number for savecore
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*
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* exported (symorder) and used at least by savecore(8)
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*
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*/
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static u_long const dumpmag = 0x8fca0101UL;
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static int dumpsize = 0; /* also for savecore */
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static int dodump = 1;
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SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, "");
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/*
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* Doadump comes here after turning off memory management and
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* getting on the dump stack, either when called above, or by
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* the auto-restart code.
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*/
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static void
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dumpsys(void)
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{
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if (!dodump)
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return;
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if (dumpdev == NODEV)
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return;
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if ((minor(dumpdev)&07) != 1)
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return;
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if (!(bdevsw[major(dumpdev)]))
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return;
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if (!(bdevsw[major(dumpdev)]->d_dump))
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return;
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dumpsize = Maxmem;
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printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo);
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printf("dump ");
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switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) {
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case ENXIO:
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printf("device bad\n");
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break;
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case EFAULT:
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printf("device not ready\n");
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break;
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case EINVAL:
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printf("area improper\n");
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break;
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case EIO:
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printf("i/o error\n");
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break;
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case EINTR:
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printf("aborted from console\n");
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break;
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default:
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printf("succeeded\n");
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break;
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}
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}
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/*
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* Panic is called on unresolvable fatal errors. It prints "panic: mesg",
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* and then reboots. If we are called twice, then we avoid trying to sync
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* the disks as this often leads to recursive panics.
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*/
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#ifdef __GNUC__
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__dead /* panic() does not return */
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#endif
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void
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panic(const char *fmt, ...)
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{
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int bootopt;
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va_list ap;
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bootopt = RB_AUTOBOOT | RB_DUMP;
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if (panicstr)
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bootopt |= RB_NOSYNC;
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else
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panicstr = fmt;
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printf("panic: ");
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va_start(ap, fmt);
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vprintf(fmt, ap);
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va_end(ap);
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printf("\n");
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#if defined(DDB)
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if (debugger_on_panic)
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Debugger ("panic");
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#endif
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boot(bootopt);
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}
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/*********************************************************
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* general routines to handle adding/deleting items on the
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* shutdown callout list
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*****
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* Take the arguments given and put them onto the shutdown callout list.
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* However first make sure that it's not already there.
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* returns 0 on success.
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*/
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int
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at_shutdown(bootlist_fn function, void *arg)
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{
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sle_p ep;
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if(rm_at_shutdown(function, arg)) {
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printf("exit callout entry already present\n");
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}
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ep = malloc(sizeof(*ep),M_TEMP,M_NOWAIT);
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if(!ep) return ENOMEM;
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ep->next = shutdown_list;
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ep->function = function;
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ep->arg = arg;
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shutdown_list = ep;
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return 0;
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}
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/*
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* Scan the exit callout list for the given items and remove them.
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* Returns the number of items removed.
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*/
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int
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rm_at_shutdown(bootlist_fn function, void *arg)
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{
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sle_p *epp,ep;
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int count = 0;
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epp = &shutdown_list;
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ep = *epp;
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while(ep) {
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if((ep->function == function) && (ep->arg = arg)) {
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*epp = ep->next;
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free(ep,M_TEMP);
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count++;
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} else {
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epp = &ep->next;
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}
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ep = *epp;
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}
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return count;
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}
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