Annotation of sys/arch/amd64/include/atomic.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: atomic.h,v 1.6 2007/05/25 16:22:11 art Exp $ */
! 2: /* $NetBSD: atomic.h,v 1.1 2003/04/26 18:39:37 fvdl Exp $ */
! 3:
! 4: /*
! 5: * Copyright 2002 (c) Wasabi Systems, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * Written by Frank van der Linden for Wasabi Systems, Inc.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: * 3. All advertising materials mentioning features or use of this software
! 19: * must display the following acknowledgement:
! 20: * This product includes software developed for the NetBSD Project by
! 21: * Wasabi Systems, Inc.
! 22: * 4. The name of Wasabi Systems, Inc. may not be used to endorse
! 23: * or promote products derived from this software without specific prior
! 24: * written permission.
! 25: *
! 26: * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
! 27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 28: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 29: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
! 30: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 31: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 32: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 33: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 34: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 35: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 36: * POSSIBILITY OF SUCH DAMAGE.
! 37: */
! 38:
! 39: #ifndef _AMD64_ATOMIC_H
! 40: #define _AMD64_ATOMIC_H
! 41:
! 42: /*
! 43: * Perform atomic operations on memory. Should be atomic with respect
! 44: * to interrupts and multiple processors.
! 45: *
! 46: * void atomic_setbits_int(volatile u_int *a, u_int mask) { *a |= mask; }
! 47: * void atomic_clearbits_int(volatile u_int *a, u_int mas) { *a &= ~mask; }
! 48: */
! 49:
! 50: #if defined(_KERNEL) && !defined(_LOCORE)
! 51:
! 52: #ifdef MULTIPROCESSOR
! 53: #define LOCK "lock"
! 54: #else
! 55: #define LOCK
! 56: #endif
! 57:
! 58: static __inline u_int64_t
! 59: x86_atomic_testset_u64(volatile u_int64_t *ptr, u_int64_t val)
! 60: {
! 61: __asm__ volatile ("xchgq %0,(%2)" :"=r" (val):"0" (val),"r" (ptr));
! 62: return val;
! 63: }
! 64:
! 65: static __inline u_int32_t
! 66: x86_atomic_testset_u32(volatile u_int32_t *ptr, u_int32_t val)
! 67: {
! 68: __asm__ volatile ("xchgl %0,(%2)" :"=r" (val):"0" (val),"r" (ptr));
! 69: return val;
! 70: }
! 71:
! 72: static __inline int32_t
! 73: x86_atomic_testset_i32(volatile int32_t *ptr, int32_t val)
! 74: {
! 75: __asm__ volatile ("xchgl %0,(%2)" :"=r" (val):"0" (val),"r" (ptr));
! 76: return val;
! 77: }
! 78:
! 79:
! 80:
! 81: static __inline void
! 82: x86_atomic_setbits_u32(volatile u_int32_t *ptr, u_int32_t bits)
! 83: {
! 84: __asm __volatile(LOCK " orl %1,%0" : "=m" (*ptr) : "ir" (bits));
! 85: }
! 86:
! 87: static __inline void
! 88: x86_atomic_clearbits_u32(volatile u_int32_t *ptr, u_int32_t bits)
! 89: {
! 90: __asm __volatile(LOCK " andl %1,%0" : "=m" (*ptr) : "ir" (~bits));
! 91: }
! 92:
! 93: static __inline u_long
! 94: x86_atomic_cas_ul(volatile u_long *ptr, u_long expect, u_long set)
! 95: {
! 96: u_long res;
! 97:
! 98: __asm volatile(LOCK " cmpxchgq %2, %1" : "=a" (res), "=m" (*ptr)
! 99: : "r" (set), "a" (expect), "m" (*ptr) : "memory");
! 100:
! 101: return (res);
! 102: }
! 103:
! 104: /*
! 105: * XXX XXX XXX
! 106: * theoretically 64bit cannot be used as
! 107: * an "i" and thus if we ever try to give
! 108: * these anything from the high dword there
! 109: * is an asm error pending
! 110: */
! 111: static __inline void
! 112: x86_atomic_setbits_u64(volatile u_int64_t *ptr, u_int64_t bits)
! 113: {
! 114: __asm __volatile(LOCK " orq %1,%0" : "=m" (*ptr) : "ir" (bits));
! 115: }
! 116:
! 117: static __inline void
! 118: x86_atomic_clearbits_u64(volatile u_int64_t *ptr, u_int64_t bits)
! 119: {
! 120: __asm __volatile(LOCK " andq %1,%0" : "=m" (*ptr) : "ir" (~bits));
! 121: }
! 122:
! 123: #define x86_atomic_testset_ul x86_atomic_testset_u32
! 124: #define x86_atomic_testset_i x86_atomic_testset_i32
! 125: #define x86_atomic_setbits_l x86_atomic_setbits_u32
! 126: #define x86_atomic_setbits_ul x86_atomic_setbits_u32
! 127: #define x86_atomic_clearbits_l x86_atomic_clearbits_u32
! 128: #define x86_atomic_clearbits_ul x86_atomic_clearbits_u32
! 129:
! 130: #define atomic_setbits_int x86_atomic_setbits_u32
! 131: #define atomic_clearbits_int x86_atomic_clearbits_u32
! 132:
! 133: #undef LOCK
! 134:
! 135: #endif /* defined(_KERNEL) && !defined(_LOCORE) */
! 136: #endif /* _AMD64_ATOMIC_H_ */
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