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lock.h revision 1.1 
      1 /* $NetBSD: lock.h,v 1.1 2014/08/10 05:47:38 matt Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 /*
     32  * Machine-dependent spin lock operations.
     33  */
     34 
     35 #ifndef _AARCH64_LOCK_H_
     36 #define	_AARCH64_LOCK_H_
     37 
     38 #ifdef __aarch64__
     39 
     40 static __inline int
     41 __SIMPLELOCK_LOCKED_P(__cpu_simple_lock_t *__ptr)
     42 {
     43 	return *__ptr != __SIMPLELOCK_UNLOCKED;
     44 }
     45 
     46 static __inline int
     47 __SIMPLELOCK_UNLOCKED_P(__cpu_simple_lock_t *__ptr)
     48 {
     49 	return *__ptr == __SIMPLELOCK_UNLOCKED;
     50 }
     51 
     52 static __inline void
     53 __cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr)
     54 {
     55 	__atomic_clear(__ptr, __ATOMIC_RELAXED);
     56 }
     57 
     58 static __inline void
     59 __cpu_simple_lock_set(__cpu_simple_lock_t *__ptr)
     60 {
     61 	(void)__atomic_test_and_set(__ptr, __ATOMIC_RELAXED);
     62 }
     63 
     64 static __inline void __unused
     65 __cpu_simple_lock_init(__cpu_simple_lock_t *alp)
     66 {
     67 	__atomic_clear(alp, __ATOMIC_ACQUIRE);
     68 }
     69 
     70 static __inline void __unused
     71 __cpu_simple_lock(__cpu_simple_lock_t *alp)
     72 {
     73 	while (__atomic_test_and_set(alp, __ATOMIC_ACQUIRE)) {
     74 		/* do nothing */
     75 	}
     76 }
     77 
     78 static __inline int __unused
     79 __cpu_simple_lock_try(__cpu_simple_lock_t *alp)
     80 {
     81 	return !__atomic_test_and_set(alp, __ATOMIC_ACQUIRE);
     82 }
     83 
     84 static __inline void __unused
     85 __cpu_simple_unlock(__cpu_simple_lock_t *alp)
     86 {
     87 	__atomic_clear(alp, __ATOMIC_RELEASE);
     88 }
     89 
     90 #elif defined(__arm__)
     91 
     92 #include <arm/lock.h>
     93 
     94 #endif
     95 
     96 #endif /* _AARCH64_LOCK_H_ */
     97