1 /* $NetBSD: atomic_add_32_cas.c,v 1.9 2014/06/23 21:53:45 joerg Exp $ */
2
3 /*-
4 * Copyright (c) 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include "atomic_op_namespace.h"
33
34 #include <sys/atomic.h>
35
36 uint32_t fetch_and_add_4(volatile uint32_t *, uint32_t, ...)
37 #if defined(_LIBC) || defined(_HARDKERNEL)
38 asm("__sync_fetch_and_add_4"); /* C runtime internal */
39 #else
40 ;
41 #endif
42
43 uint32_t
fetch_and_add_4(volatile uint32_t * addr,uint32_t val,...)44 fetch_and_add_4(volatile uint32_t *addr, uint32_t val, ...)
45 {
46 uint32_t old, new;
47
48 do {
49 old = *addr;
50 new = old + val;
51 } while (atomic_cas_32(addr, old, new) != old);
52 return old;
53 }
54
55 void
atomic_add_32(volatile uint32_t * addr,int32_t val)56 atomic_add_32(volatile uint32_t *addr, int32_t val)
57 {
58 (void) fetch_and_add_4(addr, val);
59 }
60
61 #undef atomic_add_32
62 atomic_op_alias(atomic_add_32,_atomic_add_32)
63
64 #undef atomic_add_int
65 atomic_op_alias(atomic_add_int,_atomic_add_32)
66 __strong_alias(_atomic_add_int,_atomic_add_32)
67
68 #if !defined(_LP64)
69 #undef atomic_add_long
70 atomic_op_alias(atomic_add_long,_atomic_add_32)
71 __strong_alias(_atomic_add_long,_atomic_add_32)
72
73 #undef atomic_add_ptr
74 atomic_op_alias(atomic_add_ptr,_atomic_add_32)
75 __strong_alias(_atomic_add_ptr,_atomic_add_32)
76 #endif /* _LP64 */
77
78 __strong_alias(__atomic_fetch_add_4,__sync_fetch_and_add_4)
79