1 /* $NetBSD: lock.h,v 1.14 2007/10/17 19:57:07 garbled 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