1 /*
2 * Copyright (c) 2019 François Tigeot <ftigeot@wolfpond.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef _ASM_ATOMIC64_64_H_
28 #define _ASM_ATOMIC64_64_H_
29
30 #include <linux/types.h>
31
32 #include <cpu/x86_64/include/atomic.h>
33
34 static inline long
atomic64_add_return(int64_t i,atomic64_t * v)35 atomic64_add_return(int64_t i, atomic64_t *v)
36 {
37 return i + atomic_fetchadd_64(&v->counter, i);
38 }
39
40 /* From Linux */
41 static inline void
atomic64_inc(atomic64_t * v)42 atomic64_inc(atomic64_t *v)
43 {
44 __asm __volatile(MPLOCKED "incq %0"
45 : "=m" (v->counter)
46 : "m" (v->counter));
47 }
48
49 #endif /* _ASM_ATOMIC64_64_H_ */
50