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/param.h> 29 #include <sys/systm.h> 30 #include <sys/kernel.h> 31 #include <sys/kthread.h> 32 #include <sys/lock.h> 33 #include <sys/mutex.h> 34 #include <sys/proc.h> 35 #include <sys/resourcevar.h> 36 #include <sys/sched.h> 37 #include <sys/unistd.h> 38 #ifdef SMP 39 #include <sys/smp.h> 40 #endif 41 42 static void idle_setup(void *dummy); 43 SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL); 44 45 /* 46 * Set up per-cpu idle process contexts. The AP's shouldn't be running or 47 * accessing their idle processes at this point, so don't bother with 48 * locking. 49 */ 50 static void 51 idle_setup(void *dummy) 52 { 53 #ifdef SMP 54 struct pcpu *pc; 55 #endif 56 struct proc *p; 57 struct thread *td; 58 int error; 59 60 p = NULL; /* start with no idle process */ 61 #ifdef SMP 62 STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) { 63 #endif 64 #ifdef SMP 65 error = kproc_kthread_add(sched_idletd, NULL, &p, &td, 66 RFSTOPPED | RFHIGHPID, 0, "idle", "idle: cpu%d", pc->pc_cpuid); 67 pc->pc_idlethread = td; 68 #else 69 error = kproc_kthread_add(sched_idletd, NULL, &p, &td, 70 RFSTOPPED | RFHIGHPID, 0, "idle", "idle"); 71 PCPU_SET(idlethread, td); 72 #endif 73 if (error) 74 panic("idle_setup: kproc_create error %d\n", error); 75 76 thread_lock(td); 77 TD_SET_CAN_RUN(td); 78 td->td_flags |= TDF_IDLETD | TDF_NOLOAD; 79 sched_class(td, PRI_IDLE); 80 sched_prio(td, PRI_MAX_IDLE); 81 thread_unlock(td); 82 #ifdef SMP 83 } 84 #endif 85 } 86