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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 */ |
f64acda4 MD |
51 | |
52 | static inline __attribute__((always_inline)) | |
ec4e58a3 | 53 | unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len) |
ac26f1a8 JB |
54 | { |
55 | switch (len) { | |
56 | case 4: | |
2837ec40 | 57 | { |
9c697e4d MD |
58 | unsigned int old_val; |
59 | ||
60 | __asm__ __volatile__( | |
61 | "0: cs %0,%2,%1\n" | |
62 | " brc 4,0b\n" | |
63 | : "=&r"(old_val), "=m" (*addr) | |
64 | : "r"(val), "m" (*addr) | |
65 | : "memory", "cc"); | |
1cf421dc | 66 | return old_val; |
2837ec40 | 67 | } |
ac26f1a8 JB |
68 | #if (BITS_PER_LONG == 64) |
69 | case 8: | |
2837ec40 | 70 | { |
9c697e4d MD |
71 | unsigned long old_val; |
72 | ||
73 | __asm__ __volatile__( | |
74 | "0: csg %0,%2,%1\n" | |
75 | " brc 4,0b\n" | |
76 | : "=&r"(old_val), "=m" (*addr) | |
77 | : "r"(val), "m" (*addr) | |
78 | : "memory", "cc"); | |
1cf421dc | 79 | return old_val; |
2837ec40 | 80 | } |
ac26f1a8 JB |
81 | #endif |
82 | default: | |
83 | __asm__ __volatile__(".long 0xd00d00"); | |
84 | } | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
9c697e4d | 89 | #define uatomic_xchg(addr, v) \ |
ec4e58a3 | 90 | (__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \ |
a9a05d42 | 91 | sizeof(*(addr))) |
ac26f1a8 | 92 | |
9c697e4d | 93 | /* cmpxchg */ |
8af57509 JB |
94 | |
95 | static inline __attribute__((always_inline)) | |
9c697e4d | 96 | unsigned long _uatomic_cmpxchg(void *addr, unsigned long old, |
1cf421dc | 97 | unsigned long _new, int len) |
8af57509 JB |
98 | { |
99 | switch (len) { | |
100 | case 4: | |
2837ec40 | 101 | { |
9c697e4d MD |
102 | unsigned int old_val = (unsigned int)old; |
103 | ||
104 | __asm__ __volatile__( | |
105 | " cs %0,%2,%1\n" | |
106 | : "+r"(old_val), "+m"(*addr) | |
1cf421dc | 107 | : "r"(_new) |
9c697e4d MD |
108 | : "memory", "cc"); |
109 | return old_val; | |
2837ec40 | 110 | } |
8af57509 JB |
111 | #if (BITS_PER_LONG == 64) |
112 | case 8: | |
f64acda4 | 113 | { |
9c697e4d MD |
114 | __asm__ __volatile__( |
115 | " csg %0,%2,%1\n" | |
116 | : "+r"(old), "+m"(*addr) | |
1cf421dc | 117 | : "r"(_new) |
9c697e4d MD |
118 | : "memory", "cc"); |
119 | return old; | |
f64acda4 | 120 | } |
8af57509 JB |
121 | #endif |
122 | default: | |
123 | __asm__ __volatile__(".long 0xd00d00"); | |
124 | } | |
125 | ||
9c697e4d | 126 | return 0; |
8af57509 JB |
127 | } |
128 | ||
1cf421dc | 129 | #define uatomic_cmpxchg(addr, old, _new) \ |
9c697e4d MD |
130 | (__typeof__(*(addr))) _uatomic_cmpxchg((addr), \ |
131 | (unsigned long)(old), \ | |
1cf421dc | 132 | (unsigned long)(_new), \ |
9c697e4d | 133 | sizeof(*(addr))) |
8af57509 | 134 | |
9c697e4d | 135 | /* uatomic_add_return */ |
8af57509 JB |
136 | |
137 | static inline __attribute__((always_inline)) | |
9c697e4d | 138 | unsigned long _uatomic_add_return(void *addr, unsigned long val, int len) |
8af57509 JB |
139 | { |
140 | switch (len) { | |
141 | case 4: | |
9c697e4d MD |
142 | { |
143 | unsigned int old, oldt; | |
144 | ||
145 | oldt = uatomic_read((unsigned int *)addr); | |
146 | do { | |
147 | old = oldt; | |
148 | oldt = _uatomic_cmpxchg(addr, old, old + val, 4); | |
149 | } while (oldt != old); | |
150 | ||
151 | return old + val; | |
152 | } | |
8af57509 JB |
153 | #if (BITS_PER_LONG == 64) |
154 | case 8: | |
9c697e4d MD |
155 | { |
156 | unsigned long old, oldt; | |
157 | ||
158 | oldt = uatomic_read((unsigned long *)addr); | |
159 | do { | |
160 | old = oldt; | |
161 | oldt = _uatomic_cmpxchg(addr, old, old + val, 8); | |
162 | } while (oldt != old); | |
163 | ||
164 | return old + val; | |
165 | } | |
8af57509 | 166 | #endif |
8af57509 | 167 | } |
9c697e4d | 168 | __builtin_trap(); |
8af57509 JB |
169 | return 0; |
170 | } | |
171 | ||
9c697e4d MD |
172 | #define uatomic_add_return(addr, v) \ |
173 | ((__typeof__(*(addr))) _uatomic_add_return((addr), \ | |
174 | (unsigned long)(v), \ | |
175 | sizeof(*(addr)))) | |
176 | ||
177 | /* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */ | |
178 | ||
179 | #define uatomic_sub_return(addr, v) uatomic_add_return((addr), -(v)) | |
180 | ||
181 | #define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v)) | |
182 | #define uatomic_sub(addr, v) (void)uatomic_sub_return((addr), (v)) | |
183 | ||
184 | #define uatomic_inc(addr) uatomic_add((addr), 1) | |
185 | #define uatomic_dec(addr) uatomic_add((addr), -1) | |
8af57509 | 186 | |
9c697e4d | 187 | #define compat_uatomic_cmpxchg(ptr, old, _new) uatomic_cmpxchg(ptr, old, _new) |
7d413817 | 188 | |
9c697e4d | 189 | #endif /* _URCU_UATOMIC_ARCH_S390_H */ |