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30d4f9e888
They provide relaxed-ordered atomic access semantic. Due to the FreeBSD memory model, the operations are syntaxical wrappers around the volatile accesses. The volatile qualifier is used to ensure that the access not optimized out and in turn depends on the volatile semantic as implemented by supported compilers. The motivation for adding the operation is to help people coming from other systems or knowing the C11/C++ standards where atomics have special type and require use of the special access operations. It is still the case that FreeBSD requires plain load and stores of aligned integer types to be atomic. Suggested by: jhb Reviewed by: alc, jhb Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D13534
126 lines
4.4 KiB
C
126 lines
4.4 KiB
C
/* $NetBSD: atomic.h,v 1.1 2002/10/19 12:22:34 bsh Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (C) 2003-2004 Olivier Houchard
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* Copyright (C) 1994-1997 Mark Brinicombe
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* Copyright (C) 1994 Brini
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* All rights reserved.
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*
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* This code is derived from software written for Brini by Mark Brinicombe
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Brini.
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* 4. The name of Brini may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL BRINI BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_ATOMIC_H_
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#define _MACHINE_ATOMIC_H_
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#include <sys/atomic_common.h>
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#include <machine/armreg.h>
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#ifndef _KERNEL
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#include <machine/sysarch.h>
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#endif
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#if __ARM_ARCH >= 6
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#include <machine/atomic-v6.h>
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#else /* < armv6 */
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#include <machine/atomic-v4.h>
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#endif /* Arch >= v6 */
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static __inline int
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atomic_load_32(volatile uint32_t *v)
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{
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return (*v);
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}
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static __inline void
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atomic_store_32(volatile uint32_t *dst, uint32_t src)
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{
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*dst = src;
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}
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static __inline int
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atomic_load_long(volatile u_long *v)
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{
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return (*v);
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}
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static __inline void
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atomic_store_long(volatile u_long *dst, u_long src)
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{
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*dst = src;
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}
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#define atomic_clear_ptr atomic_clear_32
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#define atomic_clear_acq_ptr atomic_clear_acq_32
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#define atomic_clear_rel_ptr atomic_clear_rel_32
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#define atomic_set_ptr atomic_set_32
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#define atomic_set_acq_ptr atomic_set_acq_32
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#define atomic_set_rel_ptr atomic_set_rel_32
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#define atomic_fcmpset_ptr atomic_fcmpset_32
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#define atomic_fcmpset_rel_ptr atomic_fcmpset_rel_32
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#define atomic_fcmpset_acq_ptr atomic_fcmpset_acq_32
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#define atomic_cmpset_ptr atomic_cmpset_32
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#define atomic_cmpset_acq_ptr atomic_cmpset_acq_32
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#define atomic_cmpset_rel_ptr atomic_cmpset_rel_32
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#define atomic_load_acq_ptr atomic_load_acq_32
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#define atomic_store_ptr atomic_store_32
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#define atomic_store_rel_ptr atomic_store_rel_32
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#define atomic_swap_ptr atomic_swap_32
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#define atomic_readandclear_ptr atomic_readandclear_32
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#define atomic_add_int atomic_add_32
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#define atomic_add_acq_int atomic_add_acq_32
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#define atomic_add_rel_int atomic_add_rel_32
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#define atomic_subtract_int atomic_subtract_32
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#define atomic_subtract_acq_int atomic_subtract_acq_32
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#define atomic_subtract_rel_int atomic_subtract_rel_32
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#define atomic_clear_int atomic_clear_32
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#define atomic_clear_acq_int atomic_clear_acq_32
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#define atomic_clear_rel_int atomic_clear_rel_32
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#define atomic_set_int atomic_set_32
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#define atomic_set_acq_int atomic_set_acq_32
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#define atomic_set_rel_int atomic_set_rel_32
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#define atomic_fcmpset_int atomic_fcmpset_32
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#define atomic_fcmpset_acq_int atomic_fcmpset_acq_32
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#define atomic_fcmpset_rel_int atomic_fcmpset_rel_32
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#define atomic_cmpset_int atomic_cmpset_32
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#define atomic_cmpset_acq_int atomic_cmpset_acq_32
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#define atomic_cmpset_rel_int atomic_cmpset_rel_32
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#define atomic_fetchadd_int atomic_fetchadd_32
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#define atomic_readandclear_int atomic_readandclear_32
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#define atomic_load_acq_int atomic_load_acq_32
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#define atomic_store_rel_int atomic_store_rel_32
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#define atomic_swap_int atomic_swap_32
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#endif /* _MACHINE_ATOMIC_H_ */
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