1 /* $NetBSD: lock.h,v 1.9 2009/01/15 01:11:32 pooka 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 #include <sys/param.h> 36 37 #ifdef _KERNEL_OPT 38 #include "opt_multiprocessor.h" 39 #endif 40 41 #if defined(_HARDKERNEL) && defined(MULTIPROCESSOR) 42 43 #include <arm/cpufunc.h> 44 45 static __inline int 46 __swp(int __val, volatile unsigned char *__ptr) 47 { 48 49 __asm volatile("swpb %0, %1, [%2]" 50 : "=r" (__val) : "r" (__val), "r" (__ptr) : "memory"); 51 return __val; 52 } 53 54 static __inline void __attribute__((__unused__)) 55 __cpu_simple_lock_init(__cpu_simple_lock_t *alp) 56 { 57 58 *alp = __SIMPLELOCK_UNLOCKED; 59 } 60 61 static __inline void __attribute__((__unused__)) 62 __cpu_simple_lock(__cpu_simple_lock_t *alp) 63 { 64 65 while (__swp(__SIMPLELOCK_LOCKED, alp) != __SIMPLELOCK_UNLOCKED) 66 continue; 67 cpu_idcache_wbinv_all(); 68 } 69 70 static __inline int __attribute__((__unused__)) 71 __cpu_simple_lock_try(__cpu_simple_lock_t *alp) 72 { 73 int __result; 74 75 __result = __swp(__SIMPLELOCK_LOCKED, alp) == __SIMPLELOCK_UNLOCKED; 76 if (__result) 77 cpu_idcache_wbinv_all(); 78 return __result; 79 } 80 81 static __inline void __attribute__((__unused__)) 82 __cpu_simple_unlock(__cpu_simple_lock_t *alp) 83 { 84 85 *alp = __SIMPLELOCK_UNLOCKED; 86 } 87 88 #else /* !(_HARDKERNEL && MULTIPROCESSOR) */ 89 #include <arm/lock.h> 90 #endif /* !(_HARDKERNEL && MULTIPROCESSOR) */ 91 #endif 92