1113661Sdeischen/*- 2113656Sdeischen * Copyright (c) 2001 Daniel Eischen <deischen@FreeBSD.org> 3113656Sdeischen * All rights reserved. 4113656Sdeischen * 5113656Sdeischen * Redistribution and use in source and binary forms, with or without 6113656Sdeischen * modification, are permitted provided that the following conditions 7113656Sdeischen * are met: 8113656Sdeischen * 1. Redistributions of source code must retain the above copyright 9113656Sdeischen * notice, this list of conditions and the following disclaimer. 10113661Sdeischen * 2. Neither the name of the author nor the names of its contributors 11113661Sdeischen * may be used to endorse or promote products derived from this software 12113661Sdeischen * without specific prior written permission. 13113656Sdeischen * 14113656Sdeischen * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15113656Sdeischen * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16113656Sdeischen * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17113656Sdeischen * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18113656Sdeischen * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19113656Sdeischen * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20113656Sdeischen * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21113656Sdeischen * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22113656Sdeischen * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23113656Sdeischen * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24113656Sdeischen * SUCH DAMAGE. 25113656Sdeischen * 26113656Sdeischen * $FreeBSD$ 27113656Sdeischen */ 28113656Sdeischen 29113656Sdeischen#ifndef _ATOMIC_OPS_H_ 30113656Sdeischen#define _ATOMIC_OPS_H_ 31113656Sdeischen 32113656Sdeischen/* 33113656Sdeischen * Atomic swap: 34113656Sdeischen * Atomic (tmp = *dst, *dst = val), then *res = tmp 35113656Sdeischen * 36119723Sdeischen * void atomic_swap32(intptr_t *dst, intptr_t val, intptr_t *res); 37113656Sdeischen */ 38113656Sdeischenstatic inline void 39174112Sdeischenatomic_swap32(volatile intptr_t *dst, intptr_t val, intptr_t *res) 40113656Sdeischen{ 41113656Sdeischen __asm __volatile( 42113656Sdeischen "xchgl %2, %1; movl %2, %0" 43113656Sdeischen : "=m" (*res) : "m" (*dst), "r" (val) : "memory"); 44113656Sdeischen} 45113656Sdeischen 46119723Sdeischen#define atomic_swap_ptr(d, v, r) \ 47174112Sdeischen atomic_swap32((volatile intptr_t *)d, (intptr_t)v, (intptr_t *)r) 48119723Sdeischen 49113656Sdeischen#define atomic_swap_int(d, v, r) \ 50174112Sdeischen atomic_swap32((volatile intptr_t *)d, (intptr_t)v, (intptr_t *)r) 51113656Sdeischen#endif 52