1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (C) 2000-2004 The FreeBSD Project. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/kernel.h> 32 #include <sys/kthread.h> 33 #include <sys/lock.h> 34 #include <sys/mutex.h> 35 #include <sys/proc.h> 36 #include <sys/resourcevar.h> 37 #include <sys/sched.h> 38 #include <sys/unistd.h> 39 #ifdef SMP 40 #include <sys/smp.h> 41 #endif 42 43 static void idle_setup(void *dummy); 44 SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL); 45 46 /* 47 * Set up per-cpu idle process contexts. The AP's shouldn't be running or 48 * accessing their idle processes at this point, so don't bother with 49 * locking. 50 */ 51 static void 52 idle_setup(void *dummy) 53 { 54 #ifdef SMP 55 struct pcpu *pc; 56 #endif 57 struct proc *p; 58 struct thread *td; 59 int error; 60 61 p = NULL; /* start with no idle process */ 62 #ifdef SMP 63 STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) { 64 #endif 65 #ifdef SMP 66 error = kproc_kthread_add(sched_idletd, NULL, &p, &td, 67 RFSTOPPED | RFHIGHPID, 0, "idle", "idle: cpu%d", pc->pc_cpuid); 68 pc->pc_idlethread = td; 69 #else 70 error = kproc_kthread_add(sched_idletd, NULL, &p, &td, 71 RFSTOPPED | RFHIGHPID, 0, "idle", "idle"); 72 PCPU_SET(idlethread, td); 73 #endif 74 if (error) 75 panic("idle_setup: kproc_create error %d\n", error); 76 77 thread_lock(td); 78 TD_SET_CAN_RUN(td); 79 td->td_flags |= TDF_IDLETD | TDF_NOLOAD; 80 sched_class(td, PRI_IDLE); 81 sched_prio(td, PRI_MAX_IDLE); 82 thread_unlock(td); 83 #ifdef SMP 84 } 85 #endif 86 } 87