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
idle_setup(void * dummy)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