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 56812Sraf * Common Development and Distribution License (the "License"). 66812Sraf * 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 */ 216812Sraf 226812Sraf/* 236812Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 246812Sraf * Use is subject to license terms. 256812Sraf */ 266812Sraf 270Sstevel@tonic-gate/* Copyright (c) 1988 AT&T */ 280Sstevel@tonic-gate/* All Rights Reserved */ 290Sstevel@tonic-gate 30*7298SMark.J.Nelson@Sun.COM .file "gettimeofday.s" 310Sstevel@tonic-gate 320Sstevel@tonic-gate/* 330Sstevel@tonic-gate * C library -- gettimeofday 340Sstevel@tonic-gate * int gettimeofday (struct timeval *tp); 350Sstevel@tonic-gate */ 360Sstevel@tonic-gate 376812Sraf#include "SYS.h" 380Sstevel@tonic-gate 390Sstevel@tonic-gate ANSI_PRAGMA_WEAK(gettimeofday,function) 400Sstevel@tonic-gate 410Sstevel@tonic-gate/* 420Sstevel@tonic-gate * The interface below calls the trap (0x27) to get the timestamp in 430Sstevel@tonic-gate * secs and nsecs. It than converts the nsecs value into usecs before 440Sstevel@tonic-gate * it returns. 450Sstevel@tonic-gate * 460Sstevel@tonic-gate * The algorithm used to perform the division by 1000 is based upon 470Sstevel@tonic-gate * algorithms for division based upon multiplication by invariant 480Sstevel@tonic-gate * integers. Relevant sources for these algorithms are: 490Sstevel@tonic-gate * 500Sstevel@tonic-gate * Granlund, T.; Montgomery, P.L.: "Division by Invariant Integers using 510Sstevel@tonic-gate * Multiplication". SIGPLAN Notices, Vol. 29, June 1994, page 61. 520Sstevel@tonic-gate * 530Sstevel@tonic-gate * Magenheimer, D.J.; et al: "Integer Multiplication and Division on the HP 540Sstevel@tonic-gate * Precision Architecture". IEEE Transactions on Computers, Vol 37, No. 8, 550Sstevel@tonic-gate * August 1988, page 980. 560Sstevel@tonic-gate * 570Sstevel@tonic-gate * Steele G.; Warren H.: Hacker's Delight. 2002 Pearson Education, Ch 10 580Sstevel@tonic-gate * 590Sstevel@tonic-gate */ 600Sstevel@tonic-gate 616812Sraf ENTRY(gettimeofday) 620Sstevel@tonic-gate brz,pn %o0, 1f 630Sstevel@tonic-gate mov %o0, %o5 640Sstevel@tonic-gate SYSFASTTRAP(GETHRESTIME) 650Sstevel@tonic-gate stn %o0, [%o5] 660Sstevel@tonic-gate sethi %hi(0x10624DD3), %o2 670Sstevel@tonic-gate or %o2, %lo(0x10624DD3), %o2 680Sstevel@tonic-gate mulx %o1, %o2, %o2 690Sstevel@tonic-gate srlx %o2, 38, %o2 700Sstevel@tonic-gate stn %o2, [%o5 + CLONGSIZE] 710Sstevel@tonic-gate1: RETC 726812Sraf SET_SIZE(gettimeofday) 73