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lock.h revision 1.12.18.1 
      1 /*	$NetBSD: lock.h,v 1.12.18.1 2007/11/06 23:22:01 matt 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * Machine-dependent spin lock operations.
     41  */
     42 
     43 #ifndef _SH3_LOCK_H_
     44 #define	_SH3_LOCK_H_
     45 
     46 static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *)
     47 	__attribute__((__unused__));
     48 static __inline void __cpu_simple_lock(__cpu_simple_lock_t *)
     49 	__attribute__((__unused__));
     50 static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *)
     51 	__attribute__((__unused__));
     52 static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *)
     53 	__attribute__((__unused__));
     54 
     55 static __inline int
     56 __SIMPLELOCK_LOCKED_P(__cpu_simple_lock_t *__ptr)
     57 {
     58 	return *__ptr == __SIMPLELOCK_LOCKED;
     59 }
     60 
     61 static __inline int
     62 __SIMPLELOCK_UNLOCKED_P(__cpu_simple_lock_t *__ptr)
     63 {
     64 	return *__ptr == __SIMPLELOCK_UNLOCKED;
     65 }
     66 
     67 static __inline void
     68 __cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr)
     69 {
     70 	*__ptr = __SIMPLELOCK_UNLOCKED;
     71 }
     72 
     73 static __inline void
     74 __cpu_simple_lock_set(__cpu_simple_lock_t *__ptr)
     75 {
     76 	*__ptr = __SIMPLELOCK_LOCKED;
     77 }
     78 
     79 static __inline void
     80 __cpu_simple_lock_init(__cpu_simple_lock_t *alp)
     81 {
     82 
     83 	*alp = __SIMPLELOCK_UNLOCKED;
     84 }
     85 
     86 static __inline void
     87 __cpu_simple_lock(__cpu_simple_lock_t *alp)
     88 {
     89 
     90 	 __asm volatile(
     91 		"1:	tas.b	%0	\n"
     92 		"	bf	1b	\n"
     93 		: "=m" (*alp)
     94 		: /* no inputs */
     95 		: "cc");
     96 }
     97 
     98 static __inline int
     99 __cpu_simple_lock_try(__cpu_simple_lock_t *alp)
    100 {
    101 	int __rv;
    102 
    103 	__asm volatile(
    104 		"	tas.b	%0	\n"
    105 		"	movt	%1	\n"
    106 		: "=m" (*alp), "=r" (__rv)
    107 		: /* no inputs */
    108 		: "cc");
    109 
    110 	return (__rv);
    111 }
    112 
    113 static __inline void
    114 __cpu_simple_unlock(__cpu_simple_lock_t *alp)
    115 {
    116 
    117 	*alp = __SIMPLELOCK_UNLOCKED;
    118 }
    119 
    120 static __inline void
    121 mb_read(void)
    122 {
    123 	__asm volatile("" : : : "memory");
    124 }
    125 
    126 static __inline void
    127 mb_write(void)
    128 {
    129 	__asm volatile("" : : : "memory");
    130 }
    131 
    132 static __inline void
    133 mb_memory(void)
    134 {
    135 	__asm volatile("" : : : "memory");
    136 }
    137 
    138 #endif /* !_SH3_LOCK_H_ */
    139