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lock.h revision 1.14.16.1 
      1 /*	$NetBSD: lock.h,v 1.14.16.1 2008/06/02 13:22:38 mjf Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Gregory McGarry.
      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 /*
     33  * Machine-dependent spin lock operations.
     34  */
     35 
     36 #ifndef _SH3_LOCK_H_
     37 #define	_SH3_LOCK_H_
     38 
     39 static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *)
     40 	__attribute__((__unused__));
     41 static __inline void __cpu_simple_lock(__cpu_simple_lock_t *)
     42 	__attribute__((__unused__));
     43 static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *)
     44 	__attribute__((__unused__));
     45 static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *)
     46 	__attribute__((__unused__));
     47 
     48 static __inline int
     49 __SIMPLELOCK_LOCKED_P(__cpu_simple_lock_t *__ptr)
     50 {
     51 	return *__ptr == __SIMPLELOCK_LOCKED;
     52 }
     53 
     54 static __inline int
     55 __SIMPLELOCK_UNLOCKED_P(__cpu_simple_lock_t *__ptr)
     56 {
     57 	return *__ptr == __SIMPLELOCK_UNLOCKED;
     58 }
     59 
     60 static __inline void
     61 __cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr)
     62 {
     63 	*__ptr = __SIMPLELOCK_UNLOCKED;
     64 }
     65 
     66 static __inline void
     67 __cpu_simple_lock_set(__cpu_simple_lock_t *__ptr)
     68 {
     69 	*__ptr = __SIMPLELOCK_LOCKED;
     70 }
     71 
     72 static __inline void
     73 __cpu_simple_lock_init(__cpu_simple_lock_t *alp)
     74 {
     75 
     76 	*alp = __SIMPLELOCK_UNLOCKED;
     77 }
     78 
     79 static __inline void
     80 __cpu_simple_lock(__cpu_simple_lock_t *alp)
     81 {
     82 
     83 	 __asm volatile(
     84 		"1:	tas.b	%0	\n"
     85 		"	bf	1b	\n"
     86 		: "=m" (*alp)
     87 		: /* no inputs */
     88 		: "cc");
     89 }
     90 
     91 static __inline int
     92 __cpu_simple_lock_try(__cpu_simple_lock_t *alp)
     93 {
     94 	int __rv;
     95 
     96 	__asm volatile(
     97 		"	tas.b	%0	\n"
     98 		"	movt	%1	\n"
     99 		: "=m" (*alp), "=r" (__rv)
    100 		: /* no inputs */
    101 		: "cc");
    102 
    103 	return (__rv);
    104 }
    105 
    106 static __inline void
    107 __cpu_simple_unlock(__cpu_simple_lock_t *alp)
    108 {
    109 
    110 	*alp = __SIMPLELOCK_UNLOCKED;
    111 }
    112 
    113 static __inline void
    114 mb_read(void)
    115 {
    116 	__asm volatile("" : : : "memory");
    117 }
    118 
    119 static __inline void
    120 mb_write(void)
    121 {
    122 	__asm volatile("" : : : "memory");
    123 }
    124 
    125 static __inline void
    126 mb_memory(void)
    127 {
    128 	__asm volatile("" : : : "memory");
    129 }
    130 
    131 #endif /* !_SH3_LOCK_H_ */
    132