1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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__FBSDID("$FreeBSD$");
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/kernel.h>
34#include <sys/kthread.h>
35#include <sys/lock.h>
36#include <sys/mutex.h>
37#include <sys/proc.h>
38#include <sys/resourcevar.h>
39#include <sys/sched.h>
40#include <sys/unistd.h>
41#ifdef SMP
42#include <sys/smp.h>
43#endif
44
45static void idle_setup(void *dummy);
46SYSINIT(idle_setup, SI_SUB_SCHED_IDLE, SI_ORDER_FIRST, idle_setup, NULL);
47
48/*
49 * Set up per-cpu idle process contexts.  The AP's shouldn't be running or
50 * accessing their idle processes at this point, so don't bother with
51 * locking.
52 */
53static void
54idle_setup(void *dummy)
55{
56#ifdef SMP
57	struct pcpu *pc;
58#endif
59	struct proc *p;
60	struct thread *td;
61	int error;
62
63	p = NULL; /* start with no idle process */
64#ifdef SMP
65	STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
66#endif
67#ifdef SMP
68		error = kproc_kthread_add(sched_idletd, NULL, &p, &td,
69		    RFSTOPPED | RFHIGHPID, 0, "idle", "idle: cpu%d", pc->pc_cpuid);
70		pc->pc_idlethread = td;
71#else
72		error = kproc_kthread_add(sched_idletd, NULL, &p, &td,
73		    RFSTOPPED | RFHIGHPID, 0, "idle", "idle");
74		PCPU_SET(idlethread, td);
75#endif
76		if (error)
77			panic("idle_setup: kproc_create error %d\n", error);
78
79		thread_lock(td);
80		TD_SET_CAN_RUN(td);
81		td->td_flags |= TDF_IDLETD | TDF_NOLOAD;
82		sched_class(td, PRI_IDLE);
83		sched_prio(td, PRI_MAX_IDLE);
84		thread_unlock(td);
85#ifdef SMP
86	}
87#endif
88}
89