1 /* $NetBSD: lock.h,v 1.7 2008/04/28 20:23:09 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2000, 2001 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _ACORN32_LOCK_H_ 33 #define _ACORN32_LOCK_H_ 34 35 #ifdef _KERNEL_OPT 36 #include "opt_multiprocessor.h" 37 #endif 38 39 #if defined(_KERNEL) && defined(MULTIPROCESSOR) 40 41 #include <arm/cpufunc.h> 42 43 static __inline int 44 __swp(int __val, volatile int *__ptr) 45 { 46 47 __asm volatile("swp %0, %1, [%2]" 48 : "=r" (__val) : "r" (__val), "r" (__ptr) : "memory"); 49 return __val; 50 } 51 52 static __inline void __attribute__((__unused__)) 53 __cpu_simple_lock_init(__cpu_simple_lock_t *alp) 54 { 55 56 *alp = __SIMPLELOCK_UNLOCKED; 57 } 58 59 static __inline void __attribute__((__unused__)) 60 __cpu_simple_lock(__cpu_simple_lock_t *alp) 61 { 62 63 while (__swp(__SIMPLELOCK_LOCKED, alp) != __SIMPLELOCK_UNLOCKED) 64 continue; 65 cpu_idcache_wbinv_all(); 66 } 67 68 static __inline int __attribute__((__unused__)) 69 __cpu_simple_lock_try(__cpu_simple_lock_t *alp) 70 { 71 int __result; 72 73 __result = __swp(__SIMPLELOCK_LOCKED, alp) == __SIMPLELOCK_UNLOCKED; 74 if (__result) 75 cpu_idcache_wbinv_all(); 76 return __result; 77 } 78 79 static __inline void __attribute__((__unused__)) 80 __cpu_simple_unlock(__cpu_simple_lock_t *alp) 81 { 82 83 *alp = __SIMPLELOCK_UNLOCKED; 84 } 85 86 #else /* !(_KERNEL && MULTIPROCESSOR) */ 87 #include <arm/lock.h> 88 #endif /* !(_KERNEL && MULTIPROCESSOR) */ 89 #endif 90