sys/platform/vkernel64/platform/shutdown.c

   1 /*
   2  * Copyright (c) 2007 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34 /*
  35  * Install a signal handler for SIGTERM which shuts down the virtual kernel
  36  */
  37
  38 #include <sys/types.h>
  39 #include <sys/systm.h>
  40 #include <sys/reboot.h>
  41 #include <sys/kernel.h>
  42 #include <sys/kthread.h>
  43 #include <sys/interrupt.h>
  44 #include <sys/bus.h>
  45 #include <ddb/ddb.h>
  46
  47 #include <sys/thread2.h>
  48
  49 #include <machine/trap.h>
  50 #include <machine/md_var.h>
  51 #include <machine/segments.h>
  52 #include <machine/cpu.h>
  53
  54 #include <err.h>
  55 #include <signal.h>
  56 #include <unistd.h>
  57
  58 static void shutdownsig(int signo);
  59 static void shutdown_intr(void *arg __unused, void *frame __unused);
  60
  61 static
  62 void
  63 initshutdown(void *arg __unused)
  64 {
  65         struct sigaction sa;
  66
  67         bzero(&sa, sizeof(sa));
  68         sigemptyset(&sa.sa_mask);
  69         sa.sa_flags |= SA_NODEFER;
  70         sa.sa_handler = shutdownsig;
  71         sigaction(SIGTERM, &sa, NULL);
  72
  73         register_int_virtual(2, shutdown_intr, NULL, "shutdown", NULL,
  74             INTR_MPSAFE);
  75 }
  76
  77 static
  78 void
  79 shutdownsig(int signo)
  80 {
  81         signalintr(2);
  82 }
  83
  84 SYSINIT(initshutdown, SI_BOOT2_PROC0, SI_ORDER_ANY,
  85         initshutdown, NULL);
  86
  87 /*
  88  * DragonFly-safe interrupt thread.  We are the only handler on interrupt
  89  * #2 so we can just steal the thread's context forever.
  90  */
  91 static
  92 void
  93 shutdown_intr(void *arg __unused, void *frame __unused)
  94 {
  95         kprintf("Caught SIGTERM from host system. Shutting down...\n");
  96         if (initproc != NULL) {
  97                 ksignal(initproc, SIGUSR2);
  98         } else {
  99                 reboot(RB_POWEROFF);
 100         }
 101 }