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      1 /*	$NetBSD: atomic_load.c,v 1.5 2024/02/14 18:00:02 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __RCSID("$NetBSD: atomic_load.c,v 1.5 2024/02/14 18:00:02 christos Exp $");
     31 
     32 #include "atomic_op_namespace.h"
     33 
     34 #include <sys/types.h>
     35 #include <sys/atomic.h>
     36 
     37 #define atomic_load_n(n,b) \
     38 uint ## b ## _t __atomic_load_ ## n(const volatile void *, int); \
     39 /*ARGSUSED*/ \
     40 uint ## b ## _t \
     41 __atomic_load_ ## n(const volatile void *ptr, int memmodel __unused) \
     42 { \
     43 	uint## b ##_t val; \
     44 	val = *(const volatile uint ## b ## _t *)ptr; \
     45 	membar_acquire(); \
     46 	return val; \
     47 }
     48 
     49 atomic_load_n(1, 8)
     50 atomic_load_n(2, 16)
     51 atomic_load_n(4, 32)
     52 #ifdef	__HAVE_ATOMIC_CAS_64_UP
     53 atomic_load_n(8, 64)
     54 #endif
     55