17c478bd9Sstevel@tonic-gate/* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 57257d1b4Sraf * Common Development and Distribution License (the "License"). 67257d1b4Sraf * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 217c478bd9Sstevel@tonic-gate 227c478bd9Sstevel@tonic-gate/* 237257d1b4Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 277257d1b4Sraf/* Copyright (c) 1988 AT&T */ 287257d1b4Sraf/* All Rights Reserved */ 297257d1b4Sraf 30*9a70fc3bSMark J. Nelson .file "gettimeofday.s" 317c478bd9Sstevel@tonic-gate 327c478bd9Sstevel@tonic-gate/* 337c478bd9Sstevel@tonic-gate * C library -- gettimeofday 347c478bd9Sstevel@tonic-gate * int gettimeofday (struct timeval *tp); 357c478bd9Sstevel@tonic-gate */ 367c478bd9Sstevel@tonic-gate 377257d1b4Sraf#include "SYS.h" 387c478bd9Sstevel@tonic-gate 397c478bd9Sstevel@tonic-gate ANSI_PRAGMA_WEAK(gettimeofday,function) 407c478bd9Sstevel@tonic-gate 417c478bd9Sstevel@tonic-gate/* 427c478bd9Sstevel@tonic-gate * The interface below calls the trap (0x27) to get the timestamp in 437c478bd9Sstevel@tonic-gate * secs and nsecs. It than converts the nsecs value into usecs before 447c478bd9Sstevel@tonic-gate * it returns. 457c478bd9Sstevel@tonic-gate * 467c478bd9Sstevel@tonic-gate * The algorithm used to perform the division by 1000 is based upon 477c478bd9Sstevel@tonic-gate * algorithms for division based upon multiplication by invariant 487c478bd9Sstevel@tonic-gate * integers. Relevant sources for these algorithms are: 497c478bd9Sstevel@tonic-gate * 507c478bd9Sstevel@tonic-gate * Granlund, T.; Montgomery, P.L.: "Division by Invariant Integers using 517c478bd9Sstevel@tonic-gate * Multiplication". SIGPLAN Notices, Vol. 29, June 1994, page 61. 527c478bd9Sstevel@tonic-gate * 537c478bd9Sstevel@tonic-gate * Magenheimer, D.J.; et al: "Integer Multiplication and Division on the HP 547c478bd9Sstevel@tonic-gate * Precision Architecture". IEEE Transactions on Computers, Vol 37, No. 8, 557c478bd9Sstevel@tonic-gate * August 1988, page 980. 567c478bd9Sstevel@tonic-gate * 577c478bd9Sstevel@tonic-gate * Steele G.; Warren H.: Hacker's Delight. 2002 Pearson Education, Ch 10 587c478bd9Sstevel@tonic-gate * 597c478bd9Sstevel@tonic-gate */ 607c478bd9Sstevel@tonic-gate 617257d1b4Sraf ENTRY(gettimeofday) 627c478bd9Sstevel@tonic-gate brz,pn %o0, 1f 637c478bd9Sstevel@tonic-gate mov %o0, %o5 647c478bd9Sstevel@tonic-gate SYSFASTTRAP(GETHRESTIME) 657c478bd9Sstevel@tonic-gate stn %o0, [%o5] 667c478bd9Sstevel@tonic-gate sethi %hi(0x10624DD3), %o2 677c478bd9Sstevel@tonic-gate or %o2, %lo(0x10624DD3), %o2 687c478bd9Sstevel@tonic-gate mulx %o1, %o2, %o2 697c478bd9Sstevel@tonic-gate srlx %o2, 38, %o2 707c478bd9Sstevel@tonic-gate stn %o2, [%o5 + CLONGSIZE] 717c478bd9Sstevel@tonic-gate1: RETC 727257d1b4Sraf SET_SIZE(gettimeofday) 73