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9c697e4d MD |
1 | #ifndef _URCU_UATOMIC_ARCH_S390_H |
2 | #define _URCU_UATOMIC_ARCH_S390_H | |
ac26f1a8 JB |
3 | |
4 | /* | |
7039fa6f JB |
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. |
ac26f1a8 | 10 | * Author: Jan Blunck <jblunck@suse.de> |
9c697e4d | 11 | * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> |
ac26f1a8 | 12 | * |
7039fa6f JB |
13 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
14 | * of this software and associated documentation files (the "Software"), to | |
15 | * deal in the Software without restriction, including without limitation the | |
16 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | |
17 | * sell copies of the Software, and to permit persons to whom the Software is | |
18 | * furnished to do so, subject to the following conditions: | |
ac26f1a8 | 19 | * |
7039fa6f JB |
20 | * The above copyright notice and this permission notice shall be included in |
21 | * all copies or substantial portions of the Software. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
24 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
25 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
26 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
27 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
28 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
29 | * IN THE SOFTWARE. | |
ac26f1a8 JB |
30 | */ |
31 | ||
b46b23cb MD |
32 | #include <urcu/compiler.h> |
33 | #include <urcu/system.h> | |
34 | ||
ac26f1a8 JB |
35 | #ifndef __SIZEOF_LONG__ |
36 | #ifdef __s390x__ | |
37 | #define __SIZEOF_LONG__ 8 | |
38 | #else | |
39 | #define __SIZEOF_LONG__ 4 | |
40 | #endif | |
41 | #endif | |
42 | ||
43 | #ifndef BITS_PER_LONG | |
44 | #define BITS_PER_LONG (__SIZEOF_LONG__ * 8) | |
45 | #endif | |
46 | ||
b46b23cb MD |
47 | #define uatomic_set(addr, v) STORE_SHARED(*(addr), (v)) |
48 | #define uatomic_read(addr) LOAD_SHARED(*(addr)) | |
8af57509 | 49 | |
9c697e4d | 50 | /* xchg */ |
ec4e58a3 | 51 | unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len) |
ac26f1a8 JB |
52 | { |
53 | switch (len) { | |
54 | case 4: | |
9c697e4d MD |
55 | unsigned int old_val; |
56 | ||
57 | __asm__ __volatile__( | |
58 | "0: cs %0,%2,%1\n" | |
59 | " brc 4,0b\n" | |
60 | : "=&r"(old_val), "=m" (*addr) | |
61 | : "r"(val), "m" (*addr) | |
62 | : "memory", "cc"); | |
ac26f1a8 JB |
63 | #if (BITS_PER_LONG == 64) |
64 | case 8: | |
9c697e4d MD |
65 | unsigned long old_val; |
66 | ||
67 | __asm__ __volatile__( | |
68 | "0: csg %0,%2,%1\n" | |
69 | " brc 4,0b\n" | |
70 | : "=&r"(old_val), "=m" (*addr) | |
71 | : "r"(val), "m" (*addr) | |
72 | : "memory", "cc"); | |
ac26f1a8 JB |
73 | #endif |
74 | default: | |
75 | __asm__ __volatile__(".long 0xd00d00"); | |
76 | } | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
9c697e4d | 81 | #define uatomic_xchg(addr, v) \ |
ec4e58a3 | 82 | (__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ |
a9a05d42 | 83 | sizeof(*(addr))) |
ac26f1a8 | 84 | |
9c697e4d | 85 | /* cmpxchg */ |
8af57509 JB |
86 | |
87 | static inline __attribute__((always_inline)) | |
9c697e4d MD |
88 | unsigned long _uatomic_cmpxchg(void *addr, unsigned long old, |
89 | unsigned long new, int len) | |
8af57509 JB |
90 | { |
91 | switch (len) { | |
92 | case 4: | |
9c697e4d MD |
93 | unsigned int old_val = (unsigned int)old; |
94 | ||
95 | __asm__ __volatile__( | |
96 | " cs %0,%2,%1\n" | |
97 | : "+r"(old_val), "+m"(*addr) | |
98 | : "r"(new) | |
99 | : "memory", "cc"); | |
100 | return old_val; | |
8af57509 JB |
101 | #if (BITS_PER_LONG == 64) |
102 | case 8: | |
9c697e4d MD |
103 | __asm__ __volatile__( |
104 | " csg %0,%2,%1\n" | |
105 | : "+r"(old), "+m"(*addr) | |
106 | : "r"(new) | |
107 | : "memory", "cc"); | |
108 | return old; | |
8af57509 JB |
109 | #endif |
110 | default: | |
111 | __asm__ __volatile__(".long 0xd00d00"); | |
112 | } | |
113 | ||
9c697e4d | 114 | return 0; |
8af57509 JB |
115 | } |
116 | ||
9c697e4d MD |
117 | #define uatomic_cmpxchg(addr, old, new) \ |
118 | (__typeof__(*(addr))) _uatomic_cmpxchg((addr), \ | |
119 | (unsigned long)(old), \ | |
120 | (unsigned long)(new), \ | |
121 | sizeof(*(addr))) | |
8af57509 | 122 | |
9c697e4d | 123 | /* uatomic_add_return */ |
8af57509 JB |
124 | |
125 | static inline __attribute__((always_inline)) | |
9c697e4d | 126 | unsigned long _uatomic_add_return(void *addr, unsigned long val, int len) |
8af57509 JB |
127 | { |
128 | switch (len) { | |
129 | case 4: | |
9c697e4d MD |
130 | { |
131 | unsigned int old, oldt; | |
132 | ||
133 | oldt = uatomic_read((unsigned int *)addr); | |
134 | do { | |
135 | old = oldt; | |
136 | oldt = _uatomic_cmpxchg(addr, old, old + val, 4); | |
137 | } while (oldt != old); | |
138 | ||
139 | return old + val; | |
140 | } | |
8af57509 JB |
141 | #if (BITS_PER_LONG == 64) |
142 | case 8: | |
9c697e4d MD |
143 | { |
144 | unsigned long old, oldt; | |
145 | ||
146 | oldt = uatomic_read((unsigned long *)addr); | |
147 | do { | |
148 | old = oldt; | |
149 | oldt = _uatomic_cmpxchg(addr, old, old + val, 8); | |
150 | } while (oldt != old); | |
151 | ||
152 | return old + val; | |
153 | } | |
8af57509 | 154 | #endif |
8af57509 | 155 | } |
9c697e4d | 156 | __builtin_trap(); |
8af57509 JB |
157 | return 0; |
158 | } | |
159 | ||
9c697e4d MD |
160 | #define uatomic_add_return(addr, v) \ |
161 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
162 | (unsigned long)(v), \ | |
163 | sizeof(*(addr)))) | |
164 | ||
165 | /* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */ | |
166 | ||
167 | #define uatomic_sub_return(addr, v) uatomic_add_return((addr), -(v)) | |
168 | ||
169 | #define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v)) | |
170 | #define uatomic_sub(addr, v) (void)uatomic_sub_return((addr), (v)) | |
171 | ||
172 | #define uatomic_inc(addr) uatomic_add((addr), 1) | |
173 | #define uatomic_dec(addr) uatomic_add((addr), -1) | |
8af57509 | 174 | |
9c697e4d | 175 | #define compat_uatomic_cmpxchg(ptr, old, _new) uatomic_cmpxchg(ptr, old, _new) |
7d413817 | 176 | |
9c697e4d | 177 | #endif /* _URCU_UATOMIC_ARCH_S390_H */ |