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/* $OpenBSD: atomic.h,v 1.2 2004/06/13 21:49:16 niklas Exp $ */
/* $NetBSD: atomic.h,v 1.1.2.2 2000/02/21 18:54:07 sommerfeld Exp $ */
/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by RedBack Networks Inc.
*
* Author: Bill Sommerfeld
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _ATOMIC_H_
#define _ATOMIC_H_
#ifndef _LOCORE
static __inline u_int32_t
i386_atomic_testset_ul (volatile u_int32_t *ptr, unsigned long val) {
__asm__ volatile ("xchgl %0,(%2)" :"=r" (val):"0" (val),"r" (ptr));
return val;
}
static __inline int
i386_atomic_testset_i (volatile int *ptr, unsigned long val) {
__asm__ volatile ("xchgl %0,(%2)" :"=r" (val):"0" (val),"r" (ptr));
return val;
}
static __inline void
i386_atomic_setbits_l (volatile u_int32_t *ptr, unsigned long bits) {
__asm __volatile("lock ; orl %1,%0" : "=m" (*ptr) : "ir" (bits));
}
static __inline void
i386_atomic_clearbits_l (volatile u_int32_t *ptr, unsigned long bits) {
bits = ~bits;
__asm __volatile("lock ; and %1,%0" : "=m" (*ptr) : "ir" (bits));
}
#endif
#endif
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