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 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 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