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      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