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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#include <asm/barrier.h>
19
20
21#define ATOMIC_INIT(i) { (i) }
22#define ATOMIC64_INIT(i) { (i) }
23
24#define atomic_read(v) READ_ONCE((v)->counter)
25#define atomic64_read(v) READ_ONCE((v)->counter)
26
27#define atomic_set(v,i) WRITE_ONCE(((v)->counter), (i))
28#define atomic64_set(v,i) WRITE_ONCE(((v)->counter), (i))
29
30#define ATOMIC_OP(op, c_op) \
31static __inline__ int \
32ia64_atomic_##op (int i, atomic_t *v) \
33{ \
34 __s32 old, new; \
35 CMPXCHG_BUGCHECK_DECL \
36 \
37 do { \
38 CMPXCHG_BUGCHECK(v); \
39 old = atomic_read(v); \
40 new = old c_op i; \
41 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); \
42 return new; \
43}
44
45ATOMIC_OP(add, +)
46ATOMIC_OP(sub, -)
47
48#define atomic_add_return(i,v) \
49({ \
50 int __ia64_aar_i = (i); \
51 (__builtin_constant_p(i) \
52 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
53 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
54 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
55 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
56 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
57 : ia64_atomic_add(__ia64_aar_i, v); \
58})
59
60#define atomic_sub_return(i,v) \
61({ \
62 int __ia64_asr_i = (i); \
63 (__builtin_constant_p(i) \
64 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
65 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
66 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
67 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
68 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
69 : ia64_atomic_sub(__ia64_asr_i, v); \
70})
71
72ATOMIC_OP(and, &)
73ATOMIC_OP(or, |)
74ATOMIC_OP(xor, ^)
75
76#define atomic_and(i,v) (void)ia64_atomic_and(i,v)
77#define atomic_or(i,v) (void)ia64_atomic_or(i,v)
78#define atomic_xor(i,v) (void)ia64_atomic_xor(i,v)
79
80#undef ATOMIC_OP
81
82#define ATOMIC64_OP(op, c_op) \
83static __inline__ long \
84ia64_atomic64_##op (__s64 i, atomic64_t *v) \
85{ \
86 __s64 old, new; \
87 CMPXCHG_BUGCHECK_DECL \
88 \
89 do { \
90 CMPXCHG_BUGCHECK(v); \
91 old = atomic64_read(v); \
92 new = old c_op i; \
93 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); \
94 return new; \
95}
96
97ATOMIC64_OP(add, +)
98ATOMIC64_OP(sub, -)
99
100#define atomic64_add_return(i,v) \
101({ \
102 long __ia64_aar_i = (i); \
103 (__builtin_constant_p(i) \
104 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
105 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
106 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
107 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
108 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
109 : ia64_atomic64_add(__ia64_aar_i, v); \
110})
111
112#define atomic64_sub_return(i,v) \
113({ \
114 long __ia64_asr_i = (i); \
115 (__builtin_constant_p(i) \
116 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
117 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
118 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
119 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
120 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
121 : ia64_atomic64_sub(__ia64_asr_i, v); \
122})
123
124ATOMIC64_OP(and, &)
125ATOMIC64_OP(or, |)
126ATOMIC64_OP(xor, ^)
127
128#define atomic64_and(i,v) (void)ia64_atomic64_and(i,v)
129#define atomic64_or(i,v) (void)ia64_atomic64_or(i,v)
130#define atomic64_xor(i,v) (void)ia64_atomic64_xor(i,v)
131
132#undef ATOMIC64_OP
133
134#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
135#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
136
137#define atomic64_cmpxchg(v, old, new) \
138 (cmpxchg(&((v)->counter), old, new))
139#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
140
141static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
142{
143 int c, old;
144 c = atomic_read(v);
145 for (;;) {
146 if (unlikely(c == (u)))
147 break;
148 old = atomic_cmpxchg((v), c, c + (a));
149 if (likely(old == c))
150 break;
151 c = old;
152 }
153 return c;
154}
155
156
157static __inline__ long atomic64_add_unless(atomic64_t *v, long a, long u)
158{
159 long c, old;
160 c = atomic64_read(v);
161 for (;;) {
162 if (unlikely(c == (u)))
163 break;
164 old = atomic64_cmpxchg((v), c, c + (a));
165 if (likely(old == c))
166 break;
167 c = old;
168 }
169 return c != (u);
170}
171
172#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
173
174/*
175 * Atomically add I to V and return TRUE if the resulting value is
176 * negative.
177 */
178static __inline__ int
179atomic_add_negative (int i, atomic_t *v)
180{
181 return atomic_add_return(i, v) < 0;
182}
183
184static __inline__ long
185atomic64_add_negative (__s64 i, atomic64_t *v)
186{
187 return atomic64_add_return(i, v) < 0;
188}
189
190#define atomic_dec_return(v) atomic_sub_return(1, (v))
191#define atomic_inc_return(v) atomic_add_return(1, (v))
192#define atomic64_dec_return(v) atomic64_sub_return(1, (v))
193#define atomic64_inc_return(v) atomic64_add_return(1, (v))
194
195#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
196#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
197#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
198#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
199#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)
200#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)
201
202#define atomic_add(i,v) (void)atomic_add_return((i), (v))
203#define atomic_sub(i,v) (void)atomic_sub_return((i), (v))
204#define atomic_inc(v) atomic_add(1, (v))
205#define atomic_dec(v) atomic_sub(1, (v))
206
207#define atomic64_add(i,v) (void)atomic64_add_return((i), (v))
208#define atomic64_sub(i,v) (void)atomic64_sub_return((i), (v))
209#define atomic64_inc(v) atomic64_add(1, (v))
210#define atomic64_dec(v) atomic64_sub(1, (v))
211
212#endif /* _ASM_IA64_ATOMIC_H */
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#include <asm/system.h>
19
20
21#define ATOMIC_INIT(i) ((atomic_t) { (i) })
22#define ATOMIC64_INIT(i) ((atomic64_t) { (i) })
23
24#define atomic_read(v) (*(volatile int *)&(v)->counter)
25#define atomic64_read(v) (*(volatile long *)&(v)->counter)
26
27#define atomic_set(v,i) (((v)->counter) = (i))
28#define atomic64_set(v,i) (((v)->counter) = (i))
29
30static __inline__ int
31ia64_atomic_add (int i, atomic_t *v)
32{
33 __s32 old, new;
34 CMPXCHG_BUGCHECK_DECL
35
36 do {
37 CMPXCHG_BUGCHECK(v);
38 old = atomic_read(v);
39 new = old + i;
40 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
41 return new;
42}
43
44static __inline__ long
45ia64_atomic64_add (__s64 i, atomic64_t *v)
46{
47 __s64 old, new;
48 CMPXCHG_BUGCHECK_DECL
49
50 do {
51 CMPXCHG_BUGCHECK(v);
52 old = atomic64_read(v);
53 new = old + i;
54 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
55 return new;
56}
57
58static __inline__ int
59ia64_atomic_sub (int i, atomic_t *v)
60{
61 __s32 old, new;
62 CMPXCHG_BUGCHECK_DECL
63
64 do {
65 CMPXCHG_BUGCHECK(v);
66 old = atomic_read(v);
67 new = old - i;
68 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
69 return new;
70}
71
72static __inline__ long
73ia64_atomic64_sub (__s64 i, atomic64_t *v)
74{
75 __s64 old, new;
76 CMPXCHG_BUGCHECK_DECL
77
78 do {
79 CMPXCHG_BUGCHECK(v);
80 old = atomic64_read(v);
81 new = old - i;
82 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
83 return new;
84}
85
86#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
87#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
88
89#define atomic64_cmpxchg(v, old, new) \
90 (cmpxchg(&((v)->counter), old, new))
91#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
92
93static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
94{
95 int c, old;
96 c = atomic_read(v);
97 for (;;) {
98 if (unlikely(c == (u)))
99 break;
100 old = atomic_cmpxchg((v), c, c + (a));
101 if (likely(old == c))
102 break;
103 c = old;
104 }
105 return c;
106}
107
108
109static __inline__ long atomic64_add_unless(atomic64_t *v, long a, long u)
110{
111 long c, old;
112 c = atomic64_read(v);
113 for (;;) {
114 if (unlikely(c == (u)))
115 break;
116 old = atomic64_cmpxchg((v), c, c + (a));
117 if (likely(old == c))
118 break;
119 c = old;
120 }
121 return c != (u);
122}
123
124#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
125
126#define atomic_add_return(i,v) \
127({ \
128 int __ia64_aar_i = (i); \
129 (__builtin_constant_p(i) \
130 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
131 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
132 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
133 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
134 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
135 : ia64_atomic_add(__ia64_aar_i, v); \
136})
137
138#define atomic64_add_return(i,v) \
139({ \
140 long __ia64_aar_i = (i); \
141 (__builtin_constant_p(i) \
142 && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
143 || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
144 || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
145 || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
146 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
147 : ia64_atomic64_add(__ia64_aar_i, v); \
148})
149
150/*
151 * Atomically add I to V and return TRUE if the resulting value is
152 * negative.
153 */
154static __inline__ int
155atomic_add_negative (int i, atomic_t *v)
156{
157 return atomic_add_return(i, v) < 0;
158}
159
160static __inline__ long
161atomic64_add_negative (__s64 i, atomic64_t *v)
162{
163 return atomic64_add_return(i, v) < 0;
164}
165
166#define atomic_sub_return(i,v) \
167({ \
168 int __ia64_asr_i = (i); \
169 (__builtin_constant_p(i) \
170 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
171 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
172 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
173 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
174 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
175 : ia64_atomic_sub(__ia64_asr_i, v); \
176})
177
178#define atomic64_sub_return(i,v) \
179({ \
180 long __ia64_asr_i = (i); \
181 (__builtin_constant_p(i) \
182 && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
183 || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
184 || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
185 || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
186 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
187 : ia64_atomic64_sub(__ia64_asr_i, v); \
188})
189
190#define atomic_dec_return(v) atomic_sub_return(1, (v))
191#define atomic_inc_return(v) atomic_add_return(1, (v))
192#define atomic64_dec_return(v) atomic64_sub_return(1, (v))
193#define atomic64_inc_return(v) atomic64_add_return(1, (v))
194
195#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
196#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
197#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
198#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
199#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)
200#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)
201
202#define atomic_add(i,v) atomic_add_return((i), (v))
203#define atomic_sub(i,v) atomic_sub_return((i), (v))
204#define atomic_inc(v) atomic_add(1, (v))
205#define atomic_dec(v) atomic_sub(1, (v))
206
207#define atomic64_add(i,v) atomic64_add_return((i), (v))
208#define atomic64_sub(i,v) atomic64_sub_return((i), (v))
209#define atomic64_inc(v) atomic64_add(1, (v))
210#define atomic64_dec(v) atomic64_sub(1, (v))
211
212/* Atomic operations are already serializing */
213#define smp_mb__before_atomic_dec() barrier()
214#define smp_mb__after_atomic_dec() barrier()
215#define smp_mb__before_atomic_inc() barrier()
216#define smp_mb__after_atomic_inc() barrier()
217
218#endif /* _ASM_IA64_ATOMIC_H */