1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 .file "lock.s" 27 28#include <sys/asm_linkage.h> 29 30/* 31 * lock_try(lp) 32 * - returns non-zero on success. 33 */ 34 ENTRY(_lock_try) 35 ldstub [%o0], %o1 ! try to set lock, get value in %o1 36 membar #LoadLoad 37 retl 38 xor %o1, 0xff, %o0 ! delay - return non-zero if success 39 SET_SIZE(_lock_try) 40 41/* 42 * lock_clear(lp) 43 * - clear lock. 44 */ 45 ENTRY(_lock_clear) 46 membar #LoadStore|#StoreStore 47 retl 48 clrb [%o0] 49 SET_SIZE(_lock_clear) 50