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      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