| 1 | /* $NetBSD: cpuset.c,v 1.18 2012/03/09 15:41:16 christos Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Christos Zoulas. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #ifndef _STANDALONE |
| 33 | #include <sys/cdefs.h> |
| 34 | #if defined(LIBC_SCCS) && !defined(lint) |
| 35 | __RCSID("$NetBSD: cpuset.c,v 1.18 2012/03/09 15:41:16 christos Exp $" ); |
| 36 | #endif /* LIBC_SCCS and not lint */ |
| 37 | |
| 38 | #include <sys/param.h> |
| 39 | #include <sys/sched.h> |
| 40 | #ifdef _KERNEL |
| 41 | #include <sys/kmem.h> |
| 42 | #include <lib/libkern/libkern.h> |
| 43 | #include <sys/atomic.h> |
| 44 | #else |
| 45 | #include <errno.h> |
| 46 | #include <string.h> |
| 47 | #include <stdlib.h> |
| 48 | #include <sys/sysctl.h> |
| 49 | #endif |
| 50 | |
| 51 | #define CPUSET_SHIFT 5 |
| 52 | #define CPUSET_MASK 31 |
| 53 | #define CPUSET_NENTRIES(nc) ((nc) > 32 ? ((nc) >> CPUSET_SHIFT) : 1) |
| 54 | #ifndef __lint__ |
| 55 | #define CPUSET_SIZE(n) (sizeof( \ |
| 56 | struct { \ |
| 57 | uint32_t bits[0]; \ |
| 58 | }) + sizeof(uint32_t) * (n)) |
| 59 | #else |
| 60 | #define CPUSET_SIZE(n) 0 |
| 61 | #endif |
| 62 | |
| 63 | struct _cpuset { |
| 64 | uint32_t bits[0]; |
| 65 | }; |
| 66 | |
| 67 | #ifndef _KERNEL |
| 68 | |
| 69 | static size_t cpuset_size = 0; |
| 70 | static size_t cpuset_nentries = 0; |
| 71 | |
| 72 | size_t |
| 73 | /*ARGSUSED*/ |
| 74 | _cpuset_size(const cpuset_t *c) |
| 75 | { |
| 76 | |
| 77 | return cpuset_size; |
| 78 | } |
| 79 | |
| 80 | void |
| 81 | _cpuset_zero(cpuset_t *c) |
| 82 | { |
| 83 | |
| 84 | memset(c->bits, 0, cpuset_nentries * sizeof(c->bits[0])); |
| 85 | } |
| 86 | |
| 87 | int |
| 88 | _cpuset_isset(cpuid_t i, const cpuset_t *c) |
| 89 | { |
| 90 | const unsigned long j = i >> CPUSET_SHIFT; |
| 91 | |
| 92 | if (j >= cpuset_nentries) { |
| 93 | errno = EINVAL; |
| 94 | return -1; |
| 95 | } |
| 96 | return ((1 << (unsigned int)(i & CPUSET_MASK)) & c->bits[j]) != 0; |
| 97 | } |
| 98 | |
| 99 | int |
| 100 | _cpuset_set(cpuid_t i, cpuset_t *c) |
| 101 | { |
| 102 | const unsigned long j = i >> CPUSET_SHIFT; |
| 103 | |
| 104 | if (j >= cpuset_nentries) { |
| 105 | errno = EINVAL; |
| 106 | return -1; |
| 107 | } |
| 108 | c->bits[j] |= 1 << (unsigned int)(i & CPUSET_MASK); |
| 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | int |
| 113 | _cpuset_clr(cpuid_t i, cpuset_t *c) |
| 114 | { |
| 115 | const unsigned long j = i >> CPUSET_SHIFT; |
| 116 | |
| 117 | if (j >= cpuset_nentries) { |
| 118 | errno = EINVAL; |
| 119 | return -1; |
| 120 | } |
| 121 | c->bits[j] &= ~(1 << (unsigned int)(i & CPUSET_MASK)); |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | cpuset_t * |
| 126 | _cpuset_create(void) |
| 127 | { |
| 128 | |
| 129 | if (cpuset_size == 0) { |
| 130 | static int mib[2] = { CTL_HW, HW_NCPU }; |
| 131 | size_t len; |
| 132 | u_int nc; |
| 133 | |
| 134 | len = sizeof(nc); |
| 135 | if (sysctl(mib, (unsigned int)__arraycount(mib), &nc, &len, |
| 136 | NULL, 0) == -1) |
| 137 | return NULL; |
| 138 | |
| 139 | cpuset_nentries = CPUSET_NENTRIES(nc); |
| 140 | cpuset_size = CPUSET_SIZE(cpuset_nentries); |
| 141 | } |
| 142 | return calloc(1, cpuset_size); |
| 143 | } |
| 144 | |
| 145 | void |
| 146 | _cpuset_destroy(cpuset_t *c) |
| 147 | { |
| 148 | |
| 149 | free(c); |
| 150 | } |
| 151 | |
| 152 | #endif |
| 153 | #endif |
| 154 | |