00001 /* 00002 * Copyright (C) 2001-2004 Jakub Jermar 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions 00007 * are met: 00008 * 00009 * - Redistributions of source code must retain the above copyright 00010 * notice, this list of conditions and the following disclaimer. 00011 * - Redistributions in binary form must reproduce the above copyright 00012 * notice, this list of conditions and the following disclaimer in the 00013 * documentation and/or other materials provided with the distribution. 00014 * - The name of the author may not be used to endorse or promote products 00015 * derived from this software without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 00018 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 00019 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 00020 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 00021 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 00022 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00023 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00024 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00025 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 00026 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00027 */ 00028 00035 #ifndef __ia32_ATOMIC_H__ 00036 #define __ia32_ATOMIC_H__ 00037 00038 static inline void atomic_inc(atomic_t *val) { 00039 __asm__ volatile ("lock incl %0\n" : "=m" (val->count)); 00040 } 00041 00042 static inline void atomic_dec(atomic_t *val) { 00043 __asm__ volatile ("lock decl %0\n" : "=m" (val->count)); 00044 } 00045 00046 static inline long atomic_postinc(atomic_t *val) 00047 { 00048 long r; 00049 00050 __asm__ volatile ( 00051 "movl $1, %0\n" 00052 "lock xaddl %0, %1\n" 00053 : "=r" (r), "=m" (val->count) 00054 ); 00055 00056 return r; 00057 } 00058 00059 static inline long atomic_postdec(atomic_t *val) 00060 { 00061 long r; 00062 00063 __asm__ volatile ( 00064 "movl $-1, %0\n" 00065 "lock xaddl %0, %1\n" 00066 : "=r" (r), "=m" (val->count) 00067 ); 00068 00069 return r; 00070 } 00071 00072 #define atomic_preinc(val) (atomic_postinc(val)+1) 00073 #define atomic_predec(val) (atomic_postdec(val)-1) 00074 00075 #endif 00076 00077