1 #ifndef _ASM_IA64_ATOMIC_H
2 #define _ASM_IA64_ATOMIC_H
5 * Atomic operations that C can't guarantee us. Useful for
6 * resource counting etc..
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
12 * Copyright (C) 1998, 1999, 2002-2003 Hewlett-Packard Co
13 * David Mosberger-Tang <davidm@hpl.hp.com>
15 #include <linux/types.h>
17 #include <asm/intrinsics.h>
20 * On IA-64, counter must always be volatile to ensure that that the
21 * memory accesses are ordered.
23 typedef struct { volatile __s32 counter; } atomic_t;
24 typedef struct { volatile __s64 counter; } atomic64_t;
26 #define ATOMIC_INIT(i) ((atomic_t) { (i) })
27 #define ATOMIC64_INIT(i) ((atomic64_t) { (i) })
29 #define atomic_read(v) ((v)->counter)
30 #define atomic64_read(v) ((v)->counter)
32 #define atomic_set(v,i) (((v)->counter) = (i))
33 #define atomic64_set(v,i) (((v)->counter) = (i))
36 ia64_atomic_add (int i, atomic_t *v)
45 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
50 ia64_atomic64_add (__s64 i, atomic64_t *v)
59 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
64 ia64_atomic_sub (int i, atomic_t *v)
73 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
78 ia64_atomic64_sub (__s64 i, atomic64_t *v)
87 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
91 #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
92 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
94 #define atomic64_cmpxchg(v, old, new) \
95 (cmpxchg(&((v)->counter), old, new))
96 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
98 #define atomic_add_unless(v, a, u) \
100 __typeof__(v->counter) c, old; \
101 c = atomic_read(v); \
103 if (unlikely(c == (u))) \
105 old = atomic_cmpxchg((v), c, c + (a)); \
106 if (likely(old == c)) \
112 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
114 #define atomic64_add_unless(v, a, u) \
116 __typeof__(v->counter) c, old; \
117 c = atomic64_read(v); \
119 if (unlikely(c == (u))) \
121 old = atomic64_cmpxchg((v), c, c + (a)); \
122 if (likely(old == c)) \
128 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
130 #define atomic_add_return(i,v) \
132 int __ia64_aar_i = (i); \
133 (__builtin_constant_p(i) \
134 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
135 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
136 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
137 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
138 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
139 : ia64_atomic_add(__ia64_aar_i, v); \
142 #define atomic64_add_return(i,v) \
144 long __ia64_aar_i = (i); \
145 (__builtin_constant_p(i) \
146 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
147 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
148 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
149 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
150 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
151 : ia64_atomic64_add(__ia64_aar_i, v); \
155 * Atomically add I to V and return TRUE if the resulting value is
158 static __inline__ int
159 atomic_add_negative (int i, atomic_t *v)
161 return atomic_add_return(i, v) < 0;
164 static __inline__ int
165 atomic64_add_negative (__s64 i, atomic64_t *v)
167 return atomic64_add_return(i, v) < 0;
170 #define atomic_sub_return(i,v) \
172 int __ia64_asr_i = (i); \
173 (__builtin_constant_p(i) \
174 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
175 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
176 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
177 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
178 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
179 : ia64_atomic_sub(__ia64_asr_i, v); \
182 #define atomic64_sub_return(i,v) \
184 long __ia64_asr_i = (i); \
185 (__builtin_constant_p(i) \
186 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
187 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
188 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
189 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
190 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
191 : ia64_atomic64_sub(__ia64_asr_i, v); \
194 #define atomic_dec_return(v) atomic_sub_return(1, (v))
195 #define atomic_inc_return(v) atomic_add_return(1, (v))
196 #define atomic64_dec_return(v) atomic64_sub_return(1, (v))
197 #define atomic64_inc_return(v) atomic64_add_return(1, (v))
199 #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
200 #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
201 #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
202 #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
203 #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)
204 #define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)
206 #define atomic_add(i,v) atomic_add_return((i), (v))
207 #define atomic_sub(i,v) atomic_sub_return((i), (v))
208 #define atomic_inc(v) atomic_add(1, (v))
209 #define atomic_dec(v) atomic_sub(1, (v))
211 #define atomic64_add(i,v) atomic64_add_return((i), (v))
212 #define atomic64_sub(i,v) atomic64_sub_return((i), (v))
213 #define atomic64_inc(v) atomic64_add(1, (v))
214 #define atomic64_dec(v) atomic64_sub(1, (v))
216 /* Atomic operations are already serializing */
217 #define smp_mb__before_atomic_dec() barrier()
218 #define smp_mb__after_atomic_dec() barrier()
219 #define smp_mb__before_atomic_inc() barrier()
220 #define smp_mb__after_atomic_inc() barrier()
222 #include <asm-generic/atomic.h>
223 #endif /* _ASM_IA64_ATOMIC_H */