1 /* $NetBSD: lock.h,v 1.13 2007/10/17 19:55:05 garbled Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 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 _M68K_LOCK_H_ 44 #define _M68K_LOCK_H_ 45 46 static __inline int 47 __SIMPLELOCK_LOCKED_P(__cpu_simple_lock_t *__ptr) 48 { 49 return *__ptr == __SIMPLELOCK_LOCKED; 50 } 51 52 static __inline int 53 __SIMPLELOCK_UNLOCKED_P(__cpu_simple_lock_t *__ptr) 54 { 55 return *__ptr == __SIMPLELOCK_UNLOCKED; 56 } 57 58 static __inline void 59 __cpu_simple_lock_init(__cpu_simple_lock_t *alp) 60 { 61 62 *alp = __SIMPLELOCK_UNLOCKED; 63 } 64 65 66 static __inline void 67 __cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr) 68 { 69 *__ptr = __SIMPLELOCK_UNLOCKED; 70 } 71 72 static __inline void 73 __cpu_simple_lock_set(__cpu_simple_lock_t *__ptr) 74 { 75 *__ptr = __SIMPLELOCK_LOCKED; 76 } 77 78 static __inline void 79 __cpu_simple_lock(__cpu_simple_lock_t *alp) 80 { 81 82 __asm volatile( 83 "1: tas %0 \n" 84 " jne 1b \n" 85 : "=m" (*alp)); 86 } 87 88 static __inline int 89 __cpu_simple_lock_try(__cpu_simple_lock_t *alp) 90 { 91 int __rv; 92 93 __asm volatile( 94 " moveq #1, %1 \n" 95 " tas %0 \n" 96 " jeq 1f \n" 97 " moveq #0, %1 \n" 98 "1: \n" 99 : "=m" (*alp), "=d" (__rv)); 100 101 return (__rv); 102 } 103 104 static __inline void 105 __cpu_simple_unlock(__cpu_simple_lock_t *alp) 106 { 107 108 *alp = __SIMPLELOCK_UNLOCKED; 109 } 110 111 static __inline void 112 mb_read(void) 113 { 114 __asm volatile("" : : : "memory"); 115 } 116 117 static __inline void 118 mb_write(void) 119 { 120 __asm volatile("" : : : "memory"); 121 } 122 123 static __inline void 124 mb_memory(void) 125 { 126 __asm volatile("" : : : "memory"); 127 } 128 129 #endif /* _M68K_LOCK_H_ */ 130