1/*-
2 * Copyright (C) 2000-2004 The FreeBSD Project. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD$");
28
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
43static void idle_setup(void *dummy);
44SYSINIT(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 */
51static void
52idle_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