/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#include "SYS.h"

	ANSI_PRAGMA_WEAK(gettimeofday,function)

/*

 *  implements int gettimeofday(struct timeval *tp, void *tzp)

 *

 *	note that tzp is always ignored

 */

	ENTRY(gettimeofday)

/*

 *	use long long gethrestime()

 */

	pushq	%rdi		/* pointer to timeval */

	SYSFASTTRAP(GETHRESTIME)

/*

 *	gethrestime trap returns seconds in %eax, nsecs in %edx

 *	need to convert nsecs to usecs & store into area pointed

 *	to by struct timeval * argument.

 */

	popq	%rcx		/* pointer to timeval */

	jrcxz	1f		/* bail if we get a null pointer */

	movq	%rax, (%rcx)	/* store seconds into timeval ptr	 */

	movl	$274877907, %eax	/* divide by 1000 as impl. by gcc */

	imull	%edx		/* See Hacker's Delight pg 162 */

	sarl	$6, %edx	/* simplified by 0 <= nsec <= 1e9 */

	movq	%rdx, 8(%rcx)	/* store usecs into timeval ptr + 8. */

1:

	RETC			/* return 0 */

	SET_SIZE(gettimeofday)