1 /* $NetBSD: lock.h,v 1.6 2003/09/26 22:46:01 nathanw 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 __P((__cpu_simple_lock_t *)) 47 __attribute__((__unused__)); 48 static __inline void __cpu_simple_lock __P((__cpu_simple_lock_t *)) 49 __attribute__((__unused__)); 50 static __inline int __cpu_simple_lock_try __P((__cpu_simple_lock_t *)) 51 __attribute__((__unused__)); 52 static __inline void __cpu_simple_unlock __P((__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 } 71 72 static __inline int 73 __cpu_simple_lock_try(__cpu_simple_lock_t *alp) 74 { 75 int __rv; 76 77 __asm __volatile( 78 " tas.b %0 \n" 79 " mov #0, %1 \n" 80 " rotcl %1 \n" 81 : "=m" (*alp), "=r" (__rv)); 82 83 return (__rv); 84 } 85 86 static __inline void 87 __cpu_simple_unlock(__cpu_simple_lock_t *alp) 88 { 89 90 *alp = __SIMPLELOCK_UNLOCKED; 91 } 92 93 #endif /* !_SH3_LOCK_H_ */ 94