xref: /onnv-gate/usr/src/lib/libc/port/gen/getisax.c (revision 6812:febeba71273d)
10Sstevel@tonic-gate /*
20Sstevel@tonic-gate  * CDDL HEADER START
30Sstevel@tonic-gate  *
40Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*6812Sraf  * Common Development and Distribution License (the "License").
6*6812Sraf  * You may not use this file except in compliance with the License.
70Sstevel@tonic-gate  *
80Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
90Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
100Sstevel@tonic-gate  * See the License for the specific language governing permissions
110Sstevel@tonic-gate  * and limitations under the License.
120Sstevel@tonic-gate  *
130Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
140Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
150Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
160Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
170Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
180Sstevel@tonic-gate  *
190Sstevel@tonic-gate  * CDDL HEADER END
200Sstevel@tonic-gate  */
21*6812Sraf 
220Sstevel@tonic-gate /*
23*6812Sraf  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
240Sstevel@tonic-gate  * Use is subject to license terms.
250Sstevel@tonic-gate  */
260Sstevel@tonic-gate 
270Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
280Sstevel@tonic-gate 
29*6812Sraf #pragma weak _getisax = getisax
300Sstevel@tonic-gate 
31*6812Sraf #include "lint.h"
320Sstevel@tonic-gate #include <sys/types.h>
330Sstevel@tonic-gate #include <sys/auxv.h>
340Sstevel@tonic-gate 
350Sstevel@tonic-gate extern long ___getauxval(int type);
360Sstevel@tonic-gate 
370Sstevel@tonic-gate /*
380Sstevel@tonic-gate  * Return the 'hwcap' vector of bits in the AT_SUN_HWCAP aux vector entry.
390Sstevel@tonic-gate  *
400Sstevel@tonic-gate  * At this time, the worst-case implementation only uses 13 bits, but for
410Sstevel@tonic-gate  * future-proofing, we allow the interface to describe an arbitrary length
420Sstevel@tonic-gate  * array of 32-bit words.
430Sstevel@tonic-gate  *
440Sstevel@tonic-gate  * As a convenience, the routine returns the maximum number of array alements
450Sstevel@tonic-gate  * that may contain non-zero values.
460Sstevel@tonic-gate  */
470Sstevel@tonic-gate uint_t
getisax(uint32_t * array,uint_t n)480Sstevel@tonic-gate getisax(uint32_t *array, uint_t n)
490Sstevel@tonic-gate {
500Sstevel@tonic-gate 	int i;
510Sstevel@tonic-gate 	static uint32_t auxv_hwcap;
520Sstevel@tonic-gate 
530Sstevel@tonic-gate 	if (auxv_hwcap == 0)
540Sstevel@tonic-gate 		auxv_hwcap = (uint32_t)___getauxval(AT_SUN_HWCAP);
550Sstevel@tonic-gate 
560Sstevel@tonic-gate 	if (n > 0) {
570Sstevel@tonic-gate 		if (n >= 1)
580Sstevel@tonic-gate 			array[0] = auxv_hwcap;
590Sstevel@tonic-gate 		for (i = 1; i < n; i++)
600Sstevel@tonic-gate 			array[i] = 0;
610Sstevel@tonic-gate 	}
620Sstevel@tonic-gate 	return (auxv_hwcap == 0 ? 0 : 1);
630Sstevel@tonic-gate }
64