1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #pragma weak _getisax = getisax 30 31 #include "lint.h" 32 #include <sys/types.h> 33 #include <sys/auxv.h> 34 35 extern long ___getauxval(int type); 36 37 /* 38 * Return the 'hwcap' vector of bits in the AT_SUN_HWCAP aux vector entry. 39 * 40 * At this time, the worst-case implementation only uses 13 bits, but for 41 * future-proofing, we allow the interface to describe an arbitrary length 42 * array of 32-bit words. 43 * 44 * As a convenience, the routine returns the maximum number of array alements 45 * that may contain non-zero values. 46 */ 47 uint_t 48 getisax(uint32_t *array, uint_t n) 49 { 50 int i; 51 static uint32_t auxv_hwcap; 52 53 if (auxv_hwcap == 0) 54 auxv_hwcap = (uint32_t)___getauxval(AT_SUN_HWCAP); 55 56 if (n > 0) { 57 if (n >= 1) 58 array[0] = auxv_hwcap; 59 for (i = 1; i < n; i++) 60 array[i] = 0; 61 } 62 return (auxv_hwcap == 0 ? 0 : 1); 63 } 64