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1 | #ifndef _ARCH_ATOMIC_S390_H |
2 | #define _ARCH_ATOMIC_S390_H | |
3 | ||
4 | /* | |
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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)". | |
ac26f1a8 | 8 | * |
7039fa6f | 9 | * Copyright (c) 2009 Novell, Inc. |
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10 | * Author: Jan Blunck <jblunck@suse.de> |
11 | * | |
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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: | |
ac26f1a8 | 18 | * |
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19 | * The above copyright notice and this permission notice shall be included in |
20 | * all copies or substantial portions of the Software. | |
21 | * | |
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 | |
28 | * IN THE SOFTWARE. | |
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29 | */ |
30 | ||
31 | #ifndef __SIZEOF_LONG__ | |
32 | #ifdef __s390x__ | |
33 | #define __SIZEOF_LONG__ 8 | |
34 | #else | |
35 | #define __SIZEOF_LONG__ 4 | |
36 | #endif | |
37 | #endif | |
38 | ||
39 | #ifndef BITS_PER_LONG | |
40 | #define BITS_PER_LONG (__SIZEOF_LONG__ * 8) | |
41 | #endif | |
42 | ||
43 | #ifndef _INCLUDE_API_H | |
44 | ||
a9a05d42 | 45 | static inline __attribute__((always_inline)) |
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46 | unsigned int atomic_exchange_32(volatile unsigned int *addr, unsigned int val) |
47 | { | |
48 | unsigned int result; | |
49 | ||
50 | __asm__ __volatile__( | |
51 | "0: cs %0,%2,%1\n" | |
52 | " brc 4,0b\n" | |
53 | : "=&r"(result), "=m" (*addr) | |
54 | : "r"(val), "m" (*addr) | |
55 | : "memory", "cc"); | |
56 | ||
57 | return result; | |
58 | } | |
59 | ||
60 | #if (BITS_PER_LONG == 64) | |
61 | ||
a9a05d42 | 62 | static inline __attribute__((always_inline)) |
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63 | unsigned long atomic_exchange_64(volatile unsigned long *addr, |
64 | unsigned long val) | |
65 | { | |
66 | unsigned long result; | |
67 | ||
68 | __asm__ __volatile__( | |
69 | "0: csg %0,%2,%1\n" | |
70 | " brc 4,0b\n" | |
71 | : "=&r"(result), "=m" (*addr) | |
72 | : "r"(val), "m" (*addr) | |
73 | : "memory", "cc"); | |
74 | ||
75 | return result; | |
76 | } | |
77 | ||
78 | #endif | |
79 | ||
a9a05d42 | 80 | static inline __attribute__((always_inline)) |
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81 | unsigned long _atomic_exchange(volatile void *addr, unsigned long val, int len) |
82 | { | |
83 | switch (len) { | |
84 | case 4: | |
85 | return atomic_exchange_32(addr, val); | |
86 | #if (BITS_PER_LONG == 64) | |
87 | case 8: | |
88 | return atomic_exchange_64(addr, val); | |
89 | #endif | |
90 | default: | |
91 | __asm__ __volatile__(".long 0xd00d00"); | |
92 | } | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
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97 | #define xchg(addr, v) \ |
98 | (__typeof__(*(addr))) _atomic_exchange((addr), (unsigned long)(v), \ | |
99 | sizeof(*(addr))) | |
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100 | |
101 | #endif /* #ifndef _INCLUDE_API_H */ | |
102 | ||
103 | #endif /* ARCH_ATOMIC_S390_H */ |