1 #ifndef _ARCH_ATOMIC_S390_H
2 #define _ARCH_ATOMIC_S390_H
5 * Atomic exchange operations for the S390 architecture. Based on information
6 * taken from the Principles of Operation Appendix A "Conditional Swapping
7 * Instructions (CS, CDS)".
9 * Copyright (c) 2009 Novell, Inc.
10 * Author: Jan Blunck <jblunck@suse.de>
12 * Permission is hereby granted, free of charge, to any person obtaining a copy
13 * of this software and associated documentation files (the "Software"), to
14 * deal in the Software without restriction, including without limitation the
15 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
16 * sell copies of the Software, and to permit persons to whom the Software is
17 * furnished to do so, subject to the following conditions:
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
25 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
31 #ifndef __SIZEOF_LONG__
33 #define __SIZEOF_LONG__ 8
35 #define __SIZEOF_LONG__ 4
40 #define BITS_PER_LONG (__SIZEOF_LONG__ * 8)
43 #ifndef _INCLUDE_API_H
45 static inline __attribute__((always_inline
))
46 unsigned int atomic_exchange_32(volatile unsigned int *addr
, unsigned int val
)
53 : "=&r"(result
), "=m" (*addr
)
54 : "r"(val
), "m" (*addr
)
60 #if (BITS_PER_LONG == 64)
62 static inline __attribute__((always_inline
))
63 unsigned long atomic_exchange_64(volatile unsigned long *addr
,
71 : "=&r"(result
), "=m" (*addr
)
72 : "r"(val
), "m" (*addr
)
80 static inline __attribute__((always_inline
))
81 unsigned long _atomic_exchange(volatile void *addr
, unsigned long val
, int len
)
85 return atomic_exchange_32(addr
, val
);
86 #if (BITS_PER_LONG == 64)
88 return atomic_exchange_64(addr
, val
);
91 __asm__
__volatile__(".long 0xd00d00");
97 #define xchg(addr, v) \
98 (__typeof__(*(addr))) _atomic_exchange((addr), (unsigned long)(v), \
101 #endif /* #ifndef _INCLUDE_API_H */
103 #endif /* ARCH_ATOMIC_S390_H */
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