1*5d9d9091SRichard Lowe/* 2*5d9d9091SRichard Lowe * CDDL HEADER START 3*5d9d9091SRichard Lowe * 4*5d9d9091SRichard Lowe * The contents of this file are subject to the terms of the 5*5d9d9091SRichard Lowe * Common Development and Distribution License (the "License"). 6*5d9d9091SRichard Lowe * You may not use this file except in compliance with the License. 7*5d9d9091SRichard Lowe * 8*5d9d9091SRichard Lowe * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*5d9d9091SRichard Lowe * or http://www.opensolaris.org/os/licensing. 10*5d9d9091SRichard Lowe * See the License for the specific language governing permissions 11*5d9d9091SRichard Lowe * and limitations under the License. 12*5d9d9091SRichard Lowe * 13*5d9d9091SRichard Lowe * When distributing Covered Code, include this CDDL HEADER in each 14*5d9d9091SRichard Lowe * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*5d9d9091SRichard Lowe * If applicable, add the following below this CDDL HEADER, with the 16*5d9d9091SRichard Lowe * fields enclosed by brackets "[]" replaced with your own identifying 17*5d9d9091SRichard Lowe * information: Portions Copyright [yyyy] [name of copyright owner] 18*5d9d9091SRichard Lowe * 19*5d9d9091SRichard Lowe * CDDL HEADER END 20*5d9d9091SRichard Lowe */ 21*5d9d9091SRichard Lowe 22*5d9d9091SRichard Lowe/* 23*5d9d9091SRichard Lowe * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24*5d9d9091SRichard Lowe * Use is subject to license terms. 25*5d9d9091SRichard Lowe */ 26*5d9d9091SRichard Lowe 27*5d9d9091SRichard Lowe/* Copyright (c) 1988 AT&T */ 28*5d9d9091SRichard Lowe/* All Rights Reserved */ 29*5d9d9091SRichard Lowe 30*5d9d9091SRichard Lowe .file "gettimeofday.s" 31*5d9d9091SRichard Lowe 32*5d9d9091SRichard Lowe/* 33*5d9d9091SRichard Lowe * C library -- gettimeofday 34*5d9d9091SRichard Lowe * int gettimeofday (struct timeval *tp); 35*5d9d9091SRichard Lowe */ 36*5d9d9091SRichard Lowe 37*5d9d9091SRichard Lowe#include "SYS.h" 38*5d9d9091SRichard Lowe 39*5d9d9091SRichard Lowe ANSI_PRAGMA_WEAK(gettimeofday,function) 40*5d9d9091SRichard Lowe 41*5d9d9091SRichard Lowe/* 42*5d9d9091SRichard Lowe * The interface below calls the trap (0x27) to get the timestamp in 43*5d9d9091SRichard Lowe * secs and nsecs. It than converts the nsecs value into usecs before 44*5d9d9091SRichard Lowe * it returns. 45*5d9d9091SRichard Lowe * 46*5d9d9091SRichard Lowe * The algorithm used to perform the division by 1000 is based upon 47*5d9d9091SRichard Lowe * algorithms for division based upon multiplication by invariant 48*5d9d9091SRichard Lowe * integers. Relevant sources for these algorithms are: 49*5d9d9091SRichard Lowe * 50*5d9d9091SRichard Lowe * Granlund, T.; Montgomery, P.L.: "Division by Invariant Integers using 51*5d9d9091SRichard Lowe * Multiplication". SIGPLAN Notices, Vol. 29, June 1994, page 61. 52*5d9d9091SRichard Lowe * 53*5d9d9091SRichard Lowe * Magenheimer, D.J.; et al: "Integer Multiplication and Division on the HP 54*5d9d9091SRichard Lowe * Precision Architecture". IEEE Transactions on Computers, Vol 37, No. 8, 55*5d9d9091SRichard Lowe * August 1988, page 980. 56*5d9d9091SRichard Lowe * 57*5d9d9091SRichard Lowe * Steele G.; Warren H.: Hacker's Delight. 2002 Pearson Education, Ch 10 58*5d9d9091SRichard Lowe * 59*5d9d9091SRichard Lowe */ 60*5d9d9091SRichard Lowe 61*5d9d9091SRichard Lowe ENTRY(gettimeofday) 62*5d9d9091SRichard Lowe brz,pn %o0, 1f 63*5d9d9091SRichard Lowe mov %o0, %o5 64*5d9d9091SRichard Lowe SYSFASTTRAP(GETHRESTIME) 65*5d9d9091SRichard Lowe stn %o0, [%o5] 66*5d9d9091SRichard Lowe sethi %hi(0x10624DD3), %o2 67*5d9d9091SRichard Lowe or %o2, %lo(0x10624DD3), %o2 68*5d9d9091SRichard Lowe mulx %o1, %o2, %o2 69*5d9d9091SRichard Lowe srlx %o2, 38, %o2 70*5d9d9091SRichard Lowe stn %o2, [%o5 + CLONGSIZE] 71*5d9d9091SRichard Lowe1: RETC 72*5d9d9091SRichard Lowe SET_SIZE(gettimeofday) 73