1#ifndef _ASM_IA64_ATOMIC_H
2#define _ASM_IA64_ATOMIC_H
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14
15#include <linux/types.h>
16
17#include <asm/intrinsics.h>
18#include <asm/system.h>
19
20
21
22
23
24typedef struct { volatile __s32 counter; } atomic_t;
25typedef struct { volatile __s64 counter; } atomic64_t;
26
27#define ATOMIC_INIT(i) ((atomic_t) { (i) })
28#define ATOMIC64_INIT(i) ((atomic64_t) { (i) })
29
30#define atomic_read(v) ((v)->counter)
31#define atomic64_read(v) ((v)->counter)
32
33#define atomic_set(v,i) (((v)->counter) = (i))
34#define atomic64_set(v,i) (((v)->counter) = (i))
35
36static __inline__ int
37ia64_atomic_add (int i, atomic_t *v)
38{
39 __s32 old, new;
40 CMPXCHG_BUGCHECK_DECL
41
42 do {
43 CMPXCHG_BUGCHECK(v);
44 old = atomic_read(v);
45 new = old + i;
46 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
47 return new;
48}
49
50static __inline__ int
51ia64_atomic64_add (__s64 i, atomic64_t *v)
52{
53 __s64 old, new;
54 CMPXCHG_BUGCHECK_DECL
55
56 do {
57 CMPXCHG_BUGCHECK(v);
58 old = atomic64_read(v);
59 new = old + i;
60 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
61 return new;
62}
63
64static __inline__ int
65ia64_atomic_sub (int i, atomic_t *v)
66{
67 __s32 old, new;
68 CMPXCHG_BUGCHECK_DECL
69
70 do {
71 CMPXCHG_BUGCHECK(v);
72 old = atomic_read(v);
73 new = old - i;
74 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
75 return new;
76}
77
78static __inline__ int
79ia64_atomic64_sub (__s64 i, atomic64_t *v)
80{
81 __s64 old, new;
82 CMPXCHG_BUGCHECK_DECL
83
84 do {
85 CMPXCHG_BUGCHECK(v);
86 old = atomic64_read(v);
87 new = old - i;
88 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
89 return new;
90}
91
92#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
93#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
94
95#define atomic64_cmpxchg(v, old, new) \
96 (cmpxchg(&((v)->counter), old, new))
97#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
98
99static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
100{
101 int c, old;
102 c = atomic_read(v);
103 for (;;) {
104 if (unlikely(c == (u)))
105 break;
106 old = atomic_cmpxchg((v), c, c + (a));
107 if (likely(old == c))
108 break;
109 c = old;
110 }
111 return c != (u);
112}
113
114#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
115
116static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
117{
118 long c, old;
119 c = atomic64_read(v);
120 for (;;) {
121 if (unlikely(c == (u)))
122 break;
123 old = atomic64_cmpxchg((v), c, c + (a));
124 if (likely(old == c))
125 break;
126 c = old;
127 }
128 return c != (u);
129}
130
131#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
132
133#define atomic_add_return(i,v) \
134({ \
135 int __ia64_aar_i = (i); \
136 (__builtin_constant_p(i) \
137 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
138 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
139 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
140 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
141 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
142 : ia64_atomic_add(__ia64_aar_i, v); \
143})
144
145#define atomic64_add_return(i,v) \
146({ \
147 long __ia64_aar_i = (i); \
148 (__builtin_constant_p(i) \
149 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
150 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
151 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
152 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
153 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
154 : ia64_atomic64_add(__ia64_aar_i, v); \
155})
156
157
158
159
160
161static __inline__ int
162atomic_add_negative (int i, atomic_t *v)
163{
164 return atomic_add_return(i, v) < 0;
165}
166
167static __inline__ int
168atomic64_add_negative (__s64 i, atomic64_t *v)
169{
170 return atomic64_add_return(i, v) < 0;
171}
172
173#define atomic_sub_return(i,v) \
174({ \
175 int __ia64_asr_i = (i); \
176 (__builtin_constant_p(i) \
177 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
178 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
179 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
180 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
181 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
182 : ia64_atomic_sub(__ia64_asr_i, v); \
183})
184
185#define atomic64_sub_return(i,v) \
186({ \
187 long __ia64_asr_i = (i); \
188 (__builtin_constant_p(i) \
189 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
190 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
191 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
192 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
193 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
194 : ia64_atomic64_sub(__ia64_asr_i, v); \
195})
196
197#define atomic_dec_return(v) atomic_sub_return(1, (v))
198#define atomic_inc_return(v) atomic_add_return(1, (v))
199#define atomic64_dec_return(v) atomic64_sub_return(1, (v))
200#define atomic64_inc_return(v) atomic64_add_return(1, (v))
201
202#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
203#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
204#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
205#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
206#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)
207#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)
208
209#define atomic_add(i,v) atomic_add_return((i), (v))
210#define atomic_sub(i,v) atomic_sub_return((i), (v))
211#define atomic_inc(v) atomic_add(1, (v))
212#define atomic_dec(v) atomic_sub(1, (v))
213
214#define atomic64_add(i,v) atomic64_add_return((i), (v))
215#define atomic64_sub(i,v) atomic64_sub_return((i), (v))
216#define atomic64_inc(v) atomic64_add(1, (v))
217#define atomic64_dec(v) atomic64_sub(1, (v))
218
219
220#define smp_mb__before_atomic_dec() barrier()
221#define smp_mb__after_atomic_dec() barrier()
222#define smp_mb__before_atomic_inc() barrier()
223#define smp_mb__after_atomic_inc() barrier()
224
225#include <asm-generic/atomic.h>
226#endif
227
