00001 /* 00002 * Copyright (C) 2005 Martin Decky 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 __ppc32_ATOMIC_H__ 00036 #define __ppc32_ATOMIC_H__ 00037 00038 static inline void atomic_inc(atomic_t *val) 00039 { 00040 long tmp; 00041 00042 asm __volatile__ ( 00043 "1:\n" 00044 "lwarx %0, 0, %2\n" 00045 "addic %0, %0, 1\n" 00046 "stwcx. %0, 0, %2\n" 00047 "bne- 1b" 00048 : "=&r" (tmp), "=m" (val->count) 00049 : "r" (&val->count), "m" (val->count) 00050 : "cc"); 00051 } 00052 00053 static inline void atomic_dec(atomic_t *val) 00054 { 00055 long tmp; 00056 00057 asm __volatile__( 00058 "1:\n" 00059 "lwarx %0, 0, %2\n" 00060 "addic %0, %0, -1\n" 00061 "stwcx. %0, 0, %2\n" 00062 "bne- 1b" 00063 : "=&r" (tmp), "=m" (val->count) 00064 : "r" (&val->count), "m" (val->count) 00065 : "cc"); 00066 } 00067 00068 static inline long atomic_postinc(atomic_t *val) 00069 { 00070 atomic_inc(val); 00071 return val->count - 1; 00072 } 00073 00074 static inline long atomic_postdec(atomic_t *val) 00075 { 00076 atomic_dec(val); 00077 return val->count + 1; 00078 } 00079 00080 static inline long atomic_preinc(atomic_t *val) 00081 { 00082 atomic_inc(val); 00083 return val->count; 00084 } 00085 00086 static inline long atomic_predec(atomic_t *val) 00087 { 00088 atomic_dec(val); 00089 return val->count; 00090 } 00091 00092 #endif 00093