1117756Sdeischen/*- 2117756Sdeischen * Copyright (c) 2001 Daniel Eischen <deischen@FreeBSD.org> 3117756Sdeischen * All rights reserved. 4117756Sdeischen * 5117756Sdeischen * Redistribution and use in source and binary forms, with or without 6117756Sdeischen * modification, are permitted provided that the following conditions 7117756Sdeischen * are met: 8117756Sdeischen * 1. Redistributions of source code must retain the above copyright 9117756Sdeischen * notice, this list of conditions and the following disclaimer. 10117756Sdeischen * 2. Neither the name of the author nor the names of its contributors 11117756Sdeischen * may be used to endorse or promote products derived from this software 12117756Sdeischen * without specific prior written permission. 13117756Sdeischen * 14117756Sdeischen * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15117756Sdeischen * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16117756Sdeischen * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17117756Sdeischen * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18117756Sdeischen * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19117756Sdeischen * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20117756Sdeischen * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21117756Sdeischen * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22117756Sdeischen * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23117756Sdeischen * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24117756Sdeischen * SUCH DAMAGE. 25117756Sdeischen * 26117756Sdeischen * $FreeBSD: releng/10.2/lib/libkse/arch/amd64/include/atomic_ops.h 174112 2007-11-30 17:20:29Z deischen $ 27117756Sdeischen */ 28117756Sdeischen 29117756Sdeischen#ifndef _ATOMIC_OPS_H_ 30117756Sdeischen#define _ATOMIC_OPS_H_ 31117756Sdeischen 32117756Sdeischen/* 33117756Sdeischen * Atomic swap: 34117756Sdeischen * Atomic (tmp = *dst, *dst = val), then *res = tmp 35117756Sdeischen * 36119723Sdeischen * void atomic_swap64(intptr_t *dst, intptr_t val, intptr_t *res); 37117756Sdeischen */ 38117756Sdeischenstatic inline void 39174112Sdeischenatomic_swap64(volatile intptr_t *dst, intptr_t val, intptr_t *res) 40117756Sdeischen{ 41117756Sdeischen __asm __volatile( 42117756Sdeischen "xchgq %2, %1; movq %2, %0" 43117756Sdeischen : "=m" (*res) : "m" (*dst), "r" (val) : "memory"); 44117756Sdeischen} 45117756Sdeischen 46119723Sdeischenstatic inline void 47174112Sdeischenatomic_swap_int(volatile int *dst, int val, int *res) 48119723Sdeischen{ 49119723Sdeischen __asm __volatile( 50119723Sdeischen "xchgl %2, %1; movl %2, %0" 51119723Sdeischen : "=m" (*res) : "m" (*dst), "r" (val) : "memory"); 52119723Sdeischen} 53119723Sdeischen 54117756Sdeischen#define atomic_swap_ptr(d, v, r) \ 55174112Sdeischen atomic_swap64((volatile intptr_t *)(d), (intptr_t)(v), (intptr_t *)(r)) 56117756Sdeischen 57117756Sdeischen#endif 58