Bring in all of Joe Talbott's SMP virtual kernel work to date, which makes
[dragonfly.git] / sys / platform / vkernel / platform / shutdown.c
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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 * $DragonFly: src/sys/platform/vkernel/platform/shutdown.c,v 1.1 2007/07/01 02:51:45 dillon Exp $
35 */
36/*
37 * Install a signal handler for SIGTERM which shuts down the virtual kernel
38 */
39
40#include "opt_ddb.h"
41#include <sys/types.h>
42#include <sys/systm.h>
43#include <sys/reboot.h>
44#include <sys/kernel.h>
45#include <sys/kthread.h>
46#include <sys/reboot.h>
47#include <sys/interrupt.h>
48#include <ddb/ddb.h>
49
50#include <sys/thread2.h>
51
52#include <machine/trap.h>
53#include <machine/md_var.h>
54#include <machine/segments.h>
55#include <machine/cpu.h>
56
57#include <err.h>
58#include <signal.h>
59#include <unistd.h>
60
61static void shutdownsig(int signo);
62static void shutdown_intr(void *arg __unused, void *frame __unused);
63
64static
65void
66initshutdown(void *arg __unused)
67{
68 struct sigaction sa;
69
70 bzero(&sa, sizeof(sa));
71 sigemptyset(&sa.sa_mask);
72 sa.sa_flags |= SA_NODEFER;
73 sa.sa_handler = shutdownsig;
74 sigaction(SIGTERM, &sa, NULL);
75
76 register_int(2, shutdown_intr, NULL, "shutdown", NULL, 0);
77}
78
79static
80void
81shutdownsig(int signo)
82{
83 signalintr(2);
84}
85
86SYSINIT(initshutdown, SI_BOOT2_PROC0, SI_ORDER_ANY,
87 initshutdown, NULL);
88
89/*
90 * DragonFly-safe interrupt thread. We are the only handler on interrupt
91 * #2 so we can just steal the thread's context forever.
92 */
93static
94void
95shutdown_intr(void *arg __unused, void *frame __unused)
96{
97 kprintf("Caught SIGTERM from host system. Shutting down...\n");
98 if (initproc != NULL) {
99 ksignal(initproc, SIGUSR2);
100 } else {
101 reboot(RB_POWEROFF);
102 }
103}
104