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1 | /* |
2 | * Copyright (C) 2006 Atmark Techno, Inc. | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | */ | |
8 | ||
9 | #ifndef _ASM_MICROBLAZE_ATOMIC_H | |
10 | #define _ASM_MICROBLAZE_ATOMIC_H | |
11 | ||
12 | #include <linux/types.h> | |
13 | #include <linux/compiler.h> /* likely */ | |
14 | #include <asm/system.h> /* local_irq_XXX and friends */ | |
15 | ||
16 | #define ATOMIC_INIT(i) { (i) } | |
17 | #define atomic_read(v) ((v)->counter) | |
18 | #define atomic_set(v, i) (((v)->counter) = (i)) | |
19 | ||
20 | #define atomic_inc(v) (atomic_add_return(1, (v))) | |
21 | #define atomic_dec(v) (atomic_sub_return(1, (v))) | |
22 | ||
23 | #define atomic_add(i, v) (atomic_add_return(i, (v))) | |
24 | #define atomic_sub(i, v) (atomic_sub_return(i, (v))) | |
25 | ||
26 | #define atomic_inc_return(v) (atomic_add_return(1, (v))) | |
27 | #define atomic_dec_return(v) (atomic_sub_return(1, (v))) | |
28 | ||
29 | #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) | |
30 | #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) | |
31 | ||
32 | #define atomic_inc_not_zero(v) (atomic_add_unless((v), 1, 0)) | |
33 | ||
34 | #define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0) | |
35 | ||
36 | static inline int atomic_cmpxchg(atomic_t *v, int old, int new) | |
37 | { | |
38 | int ret; | |
39 | unsigned long flags; | |
40 | ||
41 | local_irq_save(flags); | |
42 | ret = v->counter; | |
43 | if (likely(ret == old)) | |
44 | v->counter = new; | |
45 | local_irq_restore(flags); | |
46 | ||
47 | return ret; | |
48 | } | |
49 | ||
50 | static inline int atomic_add_unless(atomic_t *v, int a, int u) | |
51 | { | |
52 | int c, old; | |
53 | ||
54 | c = atomic_read(v); | |
55 | while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c) | |
56 | c = old; | |
57 | return c != u; | |
58 | } | |
59 | ||
60 | static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr) | |
61 | { | |
62 | unsigned long flags; | |
63 | ||
64 | local_irq_save(flags); | |
65 | *addr &= ~mask; | |
66 | local_irq_restore(flags); | |
67 | } | |
68 | ||
69 | /** | |
70 | * atomic_add_return - add and return | |
71 | * @i: integer value to add | |
72 | * @v: pointer of type atomic_t | |
73 | * | |
74 | * Atomically adds @i to @v and returns @i + @v | |
75 | */ | |
76 | static inline int atomic_add_return(int i, atomic_t *v) | |
77 | { | |
78 | unsigned long flags; | |
79 | int val; | |
80 | ||
81 | local_irq_save(flags); | |
82 | val = v->counter; | |
83 | v->counter = val += i; | |
84 | local_irq_restore(flags); | |
85 | ||
86 | return val; | |
87 | } | |
88 | ||
89 | static inline int atomic_sub_return(int i, atomic_t *v) | |
90 | { | |
91 | return atomic_add_return(-i, v); | |
92 | } | |
93 | ||
94 | /* | |
95 | * Atomically test *v and decrement if it is greater than 0. | |
96 | * The function returns the old value of *v minus 1. | |
97 | */ | |
98 | static inline int atomic_dec_if_positive(atomic_t *v) | |
99 | { | |
100 | unsigned long flags; | |
101 | int res; | |
102 | ||
103 | local_irq_save(flags); | |
104 | res = v->counter - 1; | |
105 | if (res >= 0) | |
106 | v->counter = res; | |
107 | local_irq_restore(flags); | |
108 | ||
109 | return res; | |
110 | } | |
111 | ||
112 | #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) | |
113 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) | |
114 | ||
115 | /* Atomic operations are already serializing */ | |
116 | #define smp_mb__before_atomic_dec() barrier() | |
117 | #define smp_mb__after_atomic_dec() barrier() | |
118 | #define smp_mb__before_atomic_inc() barrier() | |
119 | #define smp_mb__after_atomic_inc() barrier() | |
120 | ||
72099ed2 | 121 | #include <asm-generic/atomic-long.h> |
10713b1d MS |
122 | |
123 | #endif /* _ASM_MICROBLAZE_ATOMIC_H */ |