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/*
* 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.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
.file "gettimeofday.s"
/*
* C library -- gettimeofday
* int gettimeofday (struct timeval *tp);
*/
#include "SYS.h"
ANSI_PRAGMA_WEAK(gettimeofday,function)
/*
* The interface below calls the trap (0x27) to get the timestamp in
* secs and nsecs. It than converts the nsecs value into usecs before
* it returns.
*
* The algorithm used to perform the division by 1000 is based upon
* algorithms for division based upon multiplication by invariant
* integers. Relevant sources for these algorithms are:
*
* Granlund, T.; Montgomery, P.L.: "Division by Invariant Integers using
* Multiplication". SIGPLAN Notices, Vol. 29, June 1994, page 61.
*
* Magenheimer, D.J.; et al: "Integer Multiplication and Division on the HP
* Precision Architecture". IEEE Transactions on Computers, Vol 37, No. 8,
* August 1988, page 980.
*
* Steele G.; Warren H.: Hacker's Delight. 2002 Pearson Education, Ch 10
*
*/
ENTRY(gettimeofday)
brz,pn %o0, 1f
mov %o0, %o5
SYSFASTTRAP(GETHRESTIME)
stn %o0, [%o5]
sethi %hi(0x10624DD3), %o2
or %o2, %lo(0x10624DD3), %o2
mulx %o1, %o2, %o2
srlx %o2, 38, %o2
stn %o2, [%o5 + CLONGSIZE]
1: RETC
SET_SIZE(gettimeofday)
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