lock.s revision 9a70fc3be3b1e966bf78825cdb8d509963a6f0a1
/*
* 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 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.file "lock.s"
#include <sys/asm_linkage.h>
/*
* lock_try(lp)
* - returns non-zero on success.
*/
ENTRY(_lock_try)
ldstub [%o0], %o1 ! try to set lock, get value in %o1
membar #LoadLoad
retl
xor %o1, 0xff, %o0 ! delay - return non-zero if success
SET_SIZE(_lock_try)
/*
* lock_clear(lp)
* - clear lock.
*/
ENTRY(_lock_clear)
membar #LoadStore|#StoreStore
retl
clrb [%o0]
SET_SIZE(_lock_clear)