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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 */ |