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/* $NetBSD: cpuset.c,v 1.18 2012/03/09 15:41:16 christos Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _STANDALONE
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: cpuset.c,v 1.18 2012/03/09 15:41:16 christos Exp $");
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
#include <sys/sched.h>
#ifdef _KERNEL
#include <sys/kmem.h>
#include <lib/libkern/libkern.h>
#include <sys/atomic.h>
#else
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/sysctl.h>
#endif
#define CPUSET_SHIFT 5
#define CPUSET_MASK 31
#define CPUSET_NENTRIES(nc) ((nc) > 32 ? ((nc) >> CPUSET_SHIFT) : 1)
#ifndef __lint__
#define CPUSET_SIZE(n) (sizeof( \
struct { \
uint32_t bits[0]; \
}) + sizeof(uint32_t) * (n))
#else
#define CPUSET_SIZE(n) 0
#endif
struct _cpuset {
uint32_t bits[0];
};
#ifndef _KERNEL
static size_t cpuset_size = 0;
static size_t cpuset_nentries = 0;
size_t
/*ARGSUSED*/
_cpuset_size(const cpuset_t *c)
{
return cpuset_size;
}
void
_cpuset_zero(cpuset_t *c)
{
memset(c->bits, 0, cpuset_nentries * sizeof(c->bits[0]));
}
int
_cpuset_isset(cpuid_t i, const cpuset_t *c)
{
const unsigned long j = i >> CPUSET_SHIFT;
if (j >= cpuset_nentries) {
errno = EINVAL;
return -1;
}
return ((1 << (unsigned int)(i & CPUSET_MASK)) & c->bits[j]) != 0;
}
int
_cpuset_set(cpuid_t i, cpuset_t *c)
{
const unsigned long j = i >> CPUSET_SHIFT;
if (j >= cpuset_nentries) {
errno = EINVAL;
return -1;
}
c->bits[j] |= 1 << (unsigned int)(i & CPUSET_MASK);
return 0;
}
int
_cpuset_clr(cpuid_t i, cpuset_t *c)
{
const unsigned long j = i >> CPUSET_SHIFT;
if (j >= cpuset_nentries) {
errno = EINVAL;
return -1;
}
c->bits[j] &= ~(1 << (unsigned int)(i & CPUSET_MASK));
return 0;
}
cpuset_t *
_cpuset_create(void)
{
if (cpuset_size == 0) {
static int mib[2] = { CTL_HW, HW_NCPU };
size_t len;
u_int nc;
len = sizeof(nc);
if (sysctl(mib, (unsigned int)__arraycount(mib), &nc, &len,
NULL, 0) == -1)
return NULL;
cpuset_nentries = CPUSET_NENTRIES(nc);
cpuset_size = CPUSET_SIZE(cpuset_nentries);
}
return calloc(1, cpuset_size);
}
void
_cpuset_destroy(cpuset_t *c)
{
free(c);
}
#endif
#endif
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