1 /* $NetBSD: kern_reboot.c,v 1.5 2024/03/05 14:15:36 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
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 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)kern_xxx.c 8.3 (Berkeley) 2/14/95
32 * from: NetBSD: kern_xxx.c,v 1.74 2017/10/28 00:37:11 pgoyette Exp
33 */
34
35 #include <sys/cdefs.h>
36 __KERNEL_RCSID(0, "$NetBSD: kern_reboot.c,v 1.5 2024/03/05 14:15:36 thorpej Exp $");
37
38 #include <sys/atomic.h>
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/proc.h>
42 #include <sys/reboot.h>
43 #include <sys/syscall.h>
44 #include <sys/syscallargs.h>
45 #include <sys/kernel.h>
46 #include <sys/kauth.h>
47 #include <sys/timevar.h>
48
49 /*
50 * Reboot / shutdown the system.
51 */
52 void
kern_reboot(int howto,char * bootstr)53 kern_reboot(int howto, char *bootstr)
54 {
55 static lwp_t *rebooter;
56 lwp_t *l;
57
58 /*
59 * If already rebooting then just hang out. Allow reentry for the
60 * benfit of ddb, even if questionable. It would be better to call
61 * exit1(), but this is called from all sorts of places.
62 */
63 l = atomic_cas_ptr(&rebooter, NULL, curlwp);
64 while (l != NULL && l != curlwp) {
65 (void)kpause("reboot", true, 0, NULL);
66 }
67 shutting_down = 1;
68
69 /* Just cut to the chase if cold. */
70 if (cold) {
71 goto do_cpu_reboot;
72 }
73
74 if ((boothowto & RB_NOSYNC) == 0 && panicstr == NULL) {
75 /*
76 * If we've been adjusting the clock, the todr
77 * will be out of synch; adjust it now.
78 */
79 if (time_adjusted != 0) {
80 time_adjusted = 0;
81 resettodr();
82 }
83 }
84
85 /*
86 * XXX We should re-factor out all of the common stuff
87 * that each and every cpu_reboot() does and put it here.
88 */
89
90 do_cpu_reboot:
91 cpu_reboot(howto, bootstr);
92 }
93
94 /* ARGSUSED */
95 int
sys_reboot(struct lwp * l,const struct sys_reboot_args * uap,register_t * retval)96 sys_reboot(struct lwp *l, const struct sys_reboot_args *uap, register_t *retval)
97 {
98 /* {
99 syscallarg(int) opt;
100 syscallarg(char *) bootstr;
101 } */
102 int error;
103 char *bootstr, bs[128];
104
105 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_REBOOT,
106 0, NULL, NULL, NULL)) != 0)
107 return (error);
108
109 /*
110 * Only use the boot string if RB_STRING is set.
111 */
112 if ((SCARG(uap, opt) & RB_STRING) &&
113 (error = copyinstr(SCARG(uap, bootstr), bs, sizeof(bs), 0)) == 0)
114 bootstr = bs;
115 else
116 bootstr = NULL;
117 /*
118 * Not all ports use the bootstr currently.
119 */
120 kern_reboot(SCARG(uap, opt), bootstr);
121 return (0);
122 }
123