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lock.h revision 1.11.6.1 
      1 /*	$NetBSD: lock.h,v 1.11.6.1 2007/03/13 16:50:04 ad 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 void
     56 __cpu_simple_lock_init(__cpu_simple_lock_t *alp)
     57 {
     58 
     59 	*alp = __SIMPLELOCK_UNLOCKED;
     60 }
     61 
     62 static __inline void
     63 __cpu_simple_lock(__cpu_simple_lock_t *alp)
     64 {
     65 
     66 	 __asm volatile(
     67 		"1:	tas.b	%0	\n"
     68 		"	bf	1b	\n"
     69 		: "=m" (*alp)
     70 		: /* no inputs */
     71 		: "cc");
     72 }
     73 
     74 static __inline int
     75 __cpu_simple_lock_try(__cpu_simple_lock_t *alp)
     76 {
     77 	int __rv;
     78 
     79 	__asm volatile(
     80 		"	tas.b	%0	\n"
     81 		"	movt	%1	\n"
     82 		: "=m" (*alp), "=r" (__rv)
     83 		: /* no inputs */
     84 		: "cc");
     85 
     86 	return (__rv);
     87 }
     88 
     89 static __inline void
     90 __cpu_simple_unlock(__cpu_simple_lock_t *alp)
     91 {
     92 
     93 	*alp = __SIMPLELOCK_UNLOCKED;
     94 }
     95 
     96 static __inline void
     97 mb_read(void)
     98 {
     99 	__asm volatile("" : : : "memory");
    100 }
    101 
    102 static __inline void
    103 mb_write(void)
    104 {
    105 	__asm volatile("" : : : "memory");
    106 }
    107 
    108 static __inline void
    109 mb_memory(void)
    110 {
    111 	__asm volatile("" : : : "memory");
    112 }
    113 
    114 #endif /* !_SH3_LOCK_H_ */
    115