subr_pcpu.c revision 76440 
1/*
2 * Copyright (c) 2001 Wind River Systems, Inc.
3 * All rights reserved.
4 * Written by: John Baldwin <jhb@FreeBSD.org>
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 * 4. Neither the name of the author nor the names of any co-contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $FreeBSD: head/sys/kern/subr_pcpu.c 76440 2001-05-10 17:45:49Z jhb $
31 */
32
33/*
34 * This module provides MI support for per-cpu data.
35 */
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/pcpu.h>
40
41static struct globaldata *cpuid_to_globaldata[MAXCPU];
42struct cpuhead cpuhead = SLIST_HEAD_INITIALIZER(cpuhead);
43
44/*
45 * Register a struct globaldata.
46 */
47void
48globaldata_register(struct globaldata *globaldata)
49{
50
51	KASSERT(globaldata->gd_cpuid >= 0 && globaldata->gd_cpuid < MAXCPU,
52	    ("globaldata_register: invalid cpuid"));
53	cpuid_to_globaldata[globaldata->gd_cpuid] = globaldata;
54	SLIST_INSERT_HEAD(&cpuhead, globaldata, gd_allcpu);
55}
56
57/*
58 * Locate a struct globaldata by cpu id.
59 */
60struct globaldata *
61globaldata_find(u_int cpuid)
62{
63
64	return (cpuid_to_globaldata[cpuid]);
65}
66