diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-ia64/atomic.h |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/asm-ia64/atomic.h')
-rw-r--r-- | include/asm-ia64/atomic.h | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/include/asm-ia64/atomic.h b/include/asm-ia64/atomic.h new file mode 100644 index 000000000000..874a6f890e75 --- /dev/null +++ b/include/asm-ia64/atomic.h | |||
@@ -0,0 +1,183 @@ | |||
1 | #ifndef _ASM_IA64_ATOMIC_H | ||
2 | #define _ASM_IA64_ATOMIC_H | ||
3 | |||
4 | /* | ||
5 | * Atomic operations that C can't guarantee us. Useful for | ||
6 | * resource counting etc.. | ||
7 | * | ||
8 | * NOTE: don't mess with the types below! The "unsigned long" and | ||
9 | * "int" types were carefully placed so as to ensure proper operation | ||
10 | * of the macros. | ||
11 | * | ||
12 | * Copyright (C) 1998, 1999, 2002-2003 Hewlett-Packard Co | ||
13 | * David Mosberger-Tang <davidm@hpl.hp.com> | ||
14 | */ | ||
15 | #include <linux/types.h> | ||
16 | |||
17 | #include <asm/intrinsics.h> | ||
18 | |||
19 | /* | ||
20 | * On IA-64, counter must always be volatile to ensure that that the | ||
21 | * memory accesses are ordered. | ||
22 | */ | ||
23 | typedef struct { volatile __s32 counter; } atomic_t; | ||
24 | typedef struct { volatile __s64 counter; } atomic64_t; | ||
25 | |||
26 | #define ATOMIC_INIT(i) ((atomic_t) { (i) }) | ||
27 | #define ATOMIC64_INIT(i) ((atomic64_t) { (i) }) | ||
28 | |||
29 | #define atomic_read(v) ((v)->counter) | ||
30 | #define atomic64_read(v) ((v)->counter) | ||
31 | |||
32 | #define atomic_set(v,i) (((v)->counter) = (i)) | ||
33 | #define atomic64_set(v,i) (((v)->counter) = (i)) | ||
34 | |||
35 | static __inline__ int | ||
36 | ia64_atomic_add (int i, atomic_t *v) | ||
37 | { | ||
38 | __s32 old, new; | ||
39 | CMPXCHG_BUGCHECK_DECL | ||
40 | |||
41 | do { | ||
42 | CMPXCHG_BUGCHECK(v); | ||
43 | old = atomic_read(v); | ||
44 | new = old + i; | ||
45 | } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); | ||
46 | return new; | ||
47 | } | ||
48 | |||
49 | static __inline__ int | ||
50 | ia64_atomic64_add (__s64 i, atomic64_t *v) | ||
51 | { | ||
52 | __s64 old, new; | ||
53 | CMPXCHG_BUGCHECK_DECL | ||
54 | |||
55 | do { | ||
56 | CMPXCHG_BUGCHECK(v); | ||
57 | old = atomic_read(v); | ||
58 | new = old + i; | ||
59 | } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); | ||
60 | return new; | ||
61 | } | ||
62 | |||
63 | static __inline__ int | ||
64 | ia64_atomic_sub (int i, atomic_t *v) | ||
65 | { | ||
66 | __s32 old, new; | ||
67 | CMPXCHG_BUGCHECK_DECL | ||
68 | |||
69 | do { | ||
70 | CMPXCHG_BUGCHECK(v); | ||
71 | old = atomic_read(v); | ||
72 | new = old - i; | ||
73 | } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); | ||
74 | return new; | ||
75 | } | ||
76 | |||
77 | static __inline__ int | ||
78 | ia64_atomic64_sub (__s64 i, atomic64_t *v) | ||
79 | { | ||
80 | __s64 old, new; | ||
81 | CMPXCHG_BUGCHECK_DECL | ||
82 | |||
83 | do { | ||
84 | CMPXCHG_BUGCHECK(v); | ||
85 | old = atomic_read(v); | ||
86 | new = old - i; | ||
87 | } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); | ||
88 | return new; | ||
89 | } | ||
90 | |||
91 | #define atomic_add_return(i,v) \ | ||
92 | ({ \ | ||
93 | int __ia64_aar_i = (i); \ | ||
94 | (__builtin_constant_p(i) \ | ||
95 | && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \ | ||
96 | || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \ | ||
97 | || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \ | ||
98 | || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \ | ||
99 | ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \ | ||
100 | : ia64_atomic_add(__ia64_aar_i, v); \ | ||
101 | }) | ||
102 | |||
103 | #define atomic64_add_return(i,v) \ | ||
104 | ({ \ | ||
105 | long __ia64_aar_i = (i); \ | ||
106 | (__builtin_constant_p(i) \ | ||
107 | && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \ | ||
108 | || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \ | ||
109 | || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \ | ||
110 | || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \ | ||
111 | ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \ | ||
112 | : ia64_atomic64_add(__ia64_aar_i, v); \ | ||
113 | }) | ||
114 | |||
115 | /* | ||
116 | * Atomically add I to V and return TRUE if the resulting value is | ||
117 | * negative. | ||
118 | */ | ||
119 | static __inline__ int | ||
120 | atomic_add_negative (int i, atomic_t *v) | ||
121 | { | ||
122 | return atomic_add_return(i, v) < 0; | ||
123 | } | ||
124 | |||
125 | static __inline__ int | ||
126 | atomic64_add_negative (__s64 i, atomic64_t *v) | ||
127 | { | ||
128 | return atomic64_add_return(i, v) < 0; | ||
129 | } | ||
130 | |||
131 | #define atomic_sub_return(i,v) \ | ||
132 | ({ \ | ||
133 | int __ia64_asr_i = (i); \ | ||
134 | (__builtin_constant_p(i) \ | ||
135 | && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \ | ||
136 | || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \ | ||
137 | || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \ | ||
138 | || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \ | ||
139 | ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \ | ||
140 | : ia64_atomic_sub(__ia64_asr_i, v); \ | ||
141 | }) | ||
142 | |||
143 | #define atomic64_sub_return(i,v) \ | ||
144 | ({ \ | ||
145 | long __ia64_asr_i = (i); \ | ||
146 | (__builtin_constant_p(i) \ | ||
147 | && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \ | ||
148 | || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \ | ||
149 | || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \ | ||
150 | || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \ | ||
151 | ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \ | ||
152 | : ia64_atomic64_sub(__ia64_asr_i, v); \ | ||
153 | }) | ||
154 | |||
155 | #define atomic_dec_return(v) atomic_sub_return(1, (v)) | ||
156 | #define atomic_inc_return(v) atomic_add_return(1, (v)) | ||
157 | #define atomic64_dec_return(v) atomic64_sub_return(1, (v)) | ||
158 | #define atomic64_inc_return(v) atomic64_add_return(1, (v)) | ||
159 | |||
160 | #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) | ||
161 | #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) | ||
162 | #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) | ||
163 | #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0) | ||
164 | #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) | ||
165 | #define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0) | ||
166 | |||
167 | #define atomic_add(i,v) atomic_add_return((i), (v)) | ||
168 | #define atomic_sub(i,v) atomic_sub_return((i), (v)) | ||
169 | #define atomic_inc(v) atomic_add(1, (v)) | ||
170 | #define atomic_dec(v) atomic_sub(1, (v)) | ||
171 | |||
172 | #define atomic64_add(i,v) atomic64_add_return((i), (v)) | ||
173 | #define atomic64_sub(i,v) atomic64_sub_return((i), (v)) | ||
174 | #define atomic64_inc(v) atomic64_add(1, (v)) | ||
175 | #define atomic64_dec(v) atomic64_sub(1, (v)) | ||
176 | |||
177 | /* Atomic operations are already serializing */ | ||
178 | #define smp_mb__before_atomic_dec() barrier() | ||
179 | #define smp_mb__after_atomic_dec() barrier() | ||
180 | #define smp_mb__before_atomic_inc() barrier() | ||
181 | #define smp_mb__after_atomic_inc() barrier() | ||
182 | |||
183 | #endif /* _ASM_IA64_ATOMIC_H */ | ||