Return to atomic.h CVS log

Up to [local] / sys / arch / i386 / include

Annotation of sys/arch/i386/include/atomic.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: atomic.h,v 1.6 2007/05/25 15:55:27 art Exp $  */
        !             2: /* $NetBSD: atomic.h,v 1.1.2.2 2000/02/21 18:54:07 sommerfeld Exp $ */
        !             3:
        !             4: /*-
        !             5:  * Copyright (c) 2000 The NetBSD Foundation, Inc.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * This code is derived from software contributed to The NetBSD Foundation
        !             9:  * by RedBack Networks Inc.
        !            10:  *
        !            11:  * Author: Bill Sommerfeld
        !            12:  *
        !            13:  * Redistribution and use in source and binary forms, with or without
        !            14:  * modification, are permitted provided that the following conditions
        !            15:  * are met:
        !            16:  * 1. Redistributions of source code must retain the above copyright
        !            17:  *    notice, this list of conditions and the following disclaimer.
        !            18:  * 2. Redistributions in binary form must reproduce the above copyright
        !            19:  *    notice, this list of conditions and the following disclaimer in the
        !            20:  *    documentation and/or other materials provided with the distribution.
        !            21:  * 3. All advertising materials mentioning features or use of this software
        !            22:  *    must display the following acknowledgement:
        !            23:  *        This product includes software developed by the NetBSD
        !            24:  *        Foundation, Inc. and its contributors.
        !            25:  * 4. Neither the name of The NetBSD Foundation nor the names of its
        !            26:  *    contributors may be used to endorse or promote products derived
        !            27:  *    from this software without specific prior written permission.
        !            28:  *
        !            29:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
        !            30:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
        !            31:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        !            32:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
        !            33:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        !            34:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
        !            35:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
        !            36:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
        !            37:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
        !            38:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            39:  * POSSIBILITY OF SUCH DAMAGE.
        !            40:  */
        !            41:
        !            42: #ifndef _I386_ATOMIC_H_
        !            43: #define _I386_ATOMIC_H_
        !            44:
        !            45: /*
        !            46:  * Perform atomic operations on memory. Should be atomic with respect
        !            47:  * to interrupts and multiple processors.
        !            48:  *
        !            49:  * void atomic_setbits_int(volatile u_int *a, u_int mask) { *a |= mask; }
        !            50:  * void atomic_clearbits_int(volatile u_int *a, u_int mas) { *a &= ~mask; }
        !            51:  */
        !            52: #if defined(_KERNEL) && !defined(_LOCORE)
        !            53:
        !            54: #ifdef MULTIPROCESSOR
        !            55: #define LOCK "lock"
        !            56: #else
        !            57: #define LOCK
        !            58: #endif
        !            59:
        !            60: static __inline u_int64_t
        !            61: i386_atomic_testset_uq(volatile u_int64_t *ptr, u_int64_t val)
        !            62: {
        !            63:        __asm__ volatile ("\n1:\t" LOCK " cmpxchg8b (%1); jnz 1b" : "+A" (val) :
        !            64:            "r" (ptr), "b" ((u_int32_t)val), "c" ((u_int32_t)(val >> 32)));
        !            65:        return val;
        !            66: }
        !            67:
        !            68: static __inline u_int32_t
        !            69: i386_atomic_testset_ul(volatile u_int32_t *ptr, unsigned long val)
        !            70: {
        !            71:        __asm__ volatile ("xchgl %0,(%2)" :"=r" (val):"0" (val),"r" (ptr));
        !            72:        return val;
        !            73: }
        !            74:
        !            75: static __inline int
        !            76: i386_atomic_testset_i(volatile int *ptr, unsigned long val)
        !            77: {
        !            78:        __asm__ volatile ("xchgl %0,(%2)" :"=r" (val):"0" (val),"r" (ptr));
        !            79:        return val;
        !            80: }
        !            81:
        !            82: static __inline void
        !            83: i386_atomic_setbits_l(volatile u_int32_t *ptr, unsigned long bits)
        !            84: {
        !            85:        __asm __volatile(LOCK " orl %1,%0" :  "=m" (*ptr) : "ir" (bits));
        !            86: }
        !            87:
        !            88: static __inline void
        !            89: i386_atomic_clearbits_l(volatile u_int32_t *ptr, unsigned long bits)
        !            90: {
        !            91:        bits = ~bits;
        !            92:        __asm __volatile(LOCK " andl %1,%0" :  "=m" (*ptr) : "ir" (bits));
        !            93: }
        !            94:
        !            95: /*
        !            96:  * cas = compare and set
        !            97:  */
        !            98: static __inline int
        !            99: i486_atomic_cas_int(volatile u_int *ptr, u_int expect, u_int set)
        !           100: {
        !           101:        int res;
        !           102:
        !           103:        __asm volatile(LOCK " cmpxchgl %2, %1" : "=a" (res), "=m" (*ptr)
        !           104:             : "r" (set), "a" (expect), "m" (*ptr) : "memory");
        !           105:
        !           106:        return (res);
        !           107: }
        !           108:
        !           109: #define atomic_setbits_int i386_atomic_setbits_l
        !           110: #define atomic_clearbits_int i386_atomic_clearbits_l
        !           111:
        !           112: #undef LOCK
        !           113:
        !           114: #endif /* defined(_KERNEL) && !defined(_LOCORE) */
        !           115: #endif /* _I386_ATOMIC_H_ */