1 /* $NetBSD: lock.h,v 1.9 2005/12/28 19:09:29 perry 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 void __unused 47 __cpu_simple_lock_init(__cpu_simple_lock_t *alp) 48 { 49 50 *alp = __SIMPLELOCK_UNLOCKED; 51 } 52 53 static __inline void __unused 54 __cpu_simple_lock(__cpu_simple_lock_t *alp) 55 { 56 57 __asm volatile( 58 "1: tas %0 \n" 59 " jne 1b \n" 60 : "=m" (*alp)); 61 } 62 63 static __inline int __unused 64 __cpu_simple_lock_try(__cpu_simple_lock_t *alp) 65 { 66 int __rv; 67 68 __asm volatile( 69 " moveq #1, %1 \n" 70 " tas %0 \n" 71 " jeq 1f \n" 72 " moveq #0, %1 \n" 73 "1: \n" 74 : "=m" (*alp), "=d" (__rv)); 75 76 return (__rv); 77 } 78 79 static __inline void __unused 80 __cpu_simple_unlock(__cpu_simple_lock_t *alp) 81 { 82 83 *alp = __SIMPLELOCK_UNLOCKED; 84 } 85 86 #endif /* _M68K_LOCK_H_ */ 87