xref: /src/common/lib/libc/atomic/atomic_load.c

/*	$NetBSD: atomic_load.c,v 1.5 2024/02/14 18:00:02 christos Exp $	*/

/*-
 * Copyright (c) 2014 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__RCSID("$NetBSD: atomic_load.c,v 1.5 2024/02/14 18:00:02 christos Exp $");

#include "atomic_op_namespace.h"

#include <sys/types.h>
#include <sys/atomic.h>

#define atomic_load_n(n,b) \
uint ## b ## _t __atomic_load_ ## n(const volatile void *, int); \
/*ARGSUSED*/ \
uint ## b ## _t \
__atomic_load_ ## n(const volatile void *ptr, int memmodel __unused) \
{ \
	uint## b ##_t val; \
	val = *(const volatile uint ## b ## _t *)ptr; \
	membar_acquire(); \
	return val; \
}

atomic_load_n(1, 8)
atomic_load_n(2, 16)
atomic_load_n(4, 32)
#ifdef	__HAVE_ATOMIC_CAS_64_UP
atomic_load_n(8, 64)
#endif