s390: Fix some compiler warnings
[urcu.git] / arch_atomic_s390.h
CommitLineData
ac26f1a8
JB
1#ifndef _ARCH_ATOMIC_S390_H
2#define _ARCH_ATOMIC_S390_H
3
4/*
5 * Atomic exchange operations for the S390 architecture.
6 *
7 * Copyright (C) 2009 Novell, Inc.
8 * Author: Jan Blunck <jblunck@suse.de>
9 *
10 * This is taken from the Principles of Operation Appendix A "Conditional
11 * Swapping Instructions (CS, CDS)".
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU Lesser General Public License version 2.1 as
15 * published by the Free Software Foundation.
16 */
17
18#ifndef __SIZEOF_LONG__
19#ifdef __s390x__
20#define __SIZEOF_LONG__ 8
21#else
22#define __SIZEOF_LONG__ 4
23#endif
24#endif
25
26#ifndef BITS_PER_LONG
27#define BITS_PER_LONG (__SIZEOF_LONG__ * 8)
28#endif
29
30#ifndef _INCLUDE_API_H
31
a9a05d42 32static inline __attribute__((always_inline))
ac26f1a8
JB
33unsigned int atomic_exchange_32(volatile unsigned int *addr, unsigned int val)
34{
35 unsigned int result;
36
37 __asm__ __volatile__(
38 "0: cs %0,%2,%1\n"
39 " brc 4,0b\n"
40 : "=&r"(result), "=m" (*addr)
41 : "r"(val), "m" (*addr)
42 : "memory", "cc");
43
44 return result;
45}
46
47#if (BITS_PER_LONG == 64)
48
a9a05d42 49static inline __attribute__((always_inline))
ac26f1a8
JB
50unsigned long atomic_exchange_64(volatile unsigned long *addr,
51 unsigned long val)
52{
53 unsigned long result;
54
55 __asm__ __volatile__(
56 "0: csg %0,%2,%1\n"
57 " brc 4,0b\n"
58 : "=&r"(result), "=m" (*addr)
59 : "r"(val), "m" (*addr)
60 : "memory", "cc");
61
62 return result;
63}
64
65#endif
66
a9a05d42 67static inline __attribute__((always_inline))
ac26f1a8
JB
68unsigned long _atomic_exchange(volatile void *addr, unsigned long val, int len)
69{
70 switch (len) {
71 case 4:
72 return atomic_exchange_32(addr, val);
73#if (BITS_PER_LONG == 64)
74 case 8:
75 return atomic_exchange_64(addr, val);
76#endif
77 default:
78 __asm__ __volatile__(".long 0xd00d00");
79 }
80
81 return 0;
82}
83
a9a05d42
JB
84#define xchg(addr, v) \
85 (__typeof__(*(addr))) _atomic_exchange((addr), (unsigned long)(v), \
86 sizeof(*(addr)))
ac26f1a8
JB
87
88#endif /* #ifndef _INCLUDE_API_H */
89
90#endif /* ARCH_ATOMIC_S390_H */
This page took 0.02556 seconds and 4 git commands to generate.