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1965aae3 PA |
1 | #ifndef _ASM_X86_LOCAL_H |
2 | #define _ASM_X86_LOCAL_H | |
5638f993 HH |
3 | |
4 | #include <linux/percpu.h> | |
5 | ||
60063497 | 6 | #include <linux/atomic.h> |
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7 | #include <asm/asm.h> |
8 | ||
01c57fb6 | 9 | typedef struct { |
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10 | atomic_long_t a; |
11 | } local_t; | |
12 | ||
13 | #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } | |
14 | ||
15 | #define local_read(l) atomic_long_read(&(l)->a) | |
01c57fb6 | 16 | #define local_set(l, i) atomic_long_set(&(l)->a, (i)) |
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17 | |
18 | static inline void local_inc(local_t *l) | |
19 | { | |
69cde651 JP |
20 | asm volatile(_ASM_INC "%0" |
21 | : "+m" (l->a.counter)); | |
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22 | } |
23 | ||
24 | static inline void local_dec(local_t *l) | |
25 | { | |
69cde651 JP |
26 | asm volatile(_ASM_DEC "%0" |
27 | : "+m" (l->a.counter)); | |
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28 | } |
29 | ||
30 | static inline void local_add(long i, local_t *l) | |
31 | { | |
69cde651 JP |
32 | asm volatile(_ASM_ADD "%1,%0" |
33 | : "+m" (l->a.counter) | |
34 | : "ir" (i)); | |
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35 | } |
36 | ||
37 | static inline void local_sub(long i, local_t *l) | |
38 | { | |
69cde651 JP |
39 | asm volatile(_ASM_SUB "%1,%0" |
40 | : "+m" (l->a.counter) | |
41 | : "ir" (i)); | |
5638f993 HH |
42 | } |
43 | ||
44 | /** | |
45 | * local_sub_and_test - subtract value from variable and test result | |
46 | * @i: integer value to subtract | |
47 | * @l: pointer to type local_t | |
48 | * | |
49 | * Atomically subtracts @i from @l and returns | |
50 | * true if the result is zero, or false for all | |
51 | * other cases. | |
52 | */ | |
53 | static inline int local_sub_and_test(long i, local_t *l) | |
54 | { | |
e0f6dec3 | 55 | GEN_BINARY_RMWcc(_ASM_SUB, l->a.counter, "er", i, "%0", "e"); |
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56 | } |
57 | ||
58 | /** | |
59 | * local_dec_and_test - decrement and test | |
60 | * @l: pointer to type local_t | |
61 | * | |
62 | * Atomically decrements @l by 1 and | |
63 | * returns true if the result is 0, or false for all other | |
64 | * cases. | |
65 | */ | |
66 | static inline int local_dec_and_test(local_t *l) | |
67 | { | |
0c44c2d0 | 68 | GEN_UNARY_RMWcc(_ASM_DEC, l->a.counter, "%0", "e"); |
5638f993 HH |
69 | } |
70 | ||
71 | /** | |
72 | * local_inc_and_test - increment and test | |
73 | * @l: pointer to type local_t | |
74 | * | |
75 | * Atomically increments @l by 1 | |
76 | * and returns true if the result is zero, or false for all | |
77 | * other cases. | |
78 | */ | |
79 | static inline int local_inc_and_test(local_t *l) | |
80 | { | |
0c44c2d0 | 81 | GEN_UNARY_RMWcc(_ASM_INC, l->a.counter, "%0", "e"); |
5638f993 HH |
82 | } |
83 | ||
84 | /** | |
85 | * local_add_negative - add and test if negative | |
86 | * @i: integer value to add | |
87 | * @l: pointer to type local_t | |
88 | * | |
89 | * Atomically adds @i to @l and returns true | |
90 | * if the result is negative, or false when | |
91 | * result is greater than or equal to zero. | |
92 | */ | |
93 | static inline int local_add_negative(long i, local_t *l) | |
94 | { | |
e0f6dec3 | 95 | GEN_BINARY_RMWcc(_ASM_ADD, l->a.counter, "er", i, "%0", "s"); |
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96 | } |
97 | ||
98 | /** | |
99 | * local_add_return - add and return | |
100 | * @i: integer value to add | |
101 | * @l: pointer to type local_t | |
102 | * | |
103 | * Atomically adds @i to @l and returns @i + @l | |
104 | */ | |
105 | static inline long local_add_return(long i, local_t *l) | |
106 | { | |
7ac468b1 | 107 | long __i = i; |
69cde651 JP |
108 | asm volatile(_ASM_XADD "%0, %1;" |
109 | : "+r" (i), "+m" (l->a.counter) | |
110 | : : "memory"); | |
5638f993 | 111 | return i + __i; |
5638f993 HH |
112 | } |
113 | ||
114 | static inline long local_sub_return(long i, local_t *l) | |
115 | { | |
01c57fb6 | 116 | return local_add_return(-i, l); |
5638f993 HH |
117 | } |
118 | ||
01c57fb6 HH |
119 | #define local_inc_return(l) (local_add_return(1, l)) |
120 | #define local_dec_return(l) (local_sub_return(1, l)) | |
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121 | |
122 | #define local_cmpxchg(l, o, n) \ | |
123 | (cmpxchg_local(&((l)->a.counter), (o), (n))) | |
124 | /* Always has a lock prefix */ | |
125 | #define local_xchg(l, n) (xchg(&((l)->a.counter), (n))) | |
126 | ||
127 | /** | |
128 | * local_add_unless - add unless the number is a given value | |
129 | * @l: pointer of type local_t | |
130 | * @a: the amount to add to l... | |
131 | * @u: ...unless l is equal to u. | |
132 | * | |
133 | * Atomically adds @a to @l, so long as it was not @u. | |
134 | * Returns non-zero if @l was not @u, and zero otherwise. | |
135 | */ | |
136 | #define local_add_unless(l, a, u) \ | |
137 | ({ \ | |
138 | long c, old; \ | |
69cde651 | 139 | c = local_read((l)); \ |
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140 | for (;;) { \ |
141 | if (unlikely(c == (u))) \ | |
142 | break; \ | |
69cde651 | 143 | old = local_cmpxchg((l), c, c + (a)); \ |
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144 | if (likely(old == c)) \ |
145 | break; \ | |
146 | c = old; \ | |
147 | } \ | |
148 | c != (u); \ | |
149 | }) | |
150 | #define local_inc_not_zero(l) local_add_unless((l), 1, 0) | |
151 | ||
152 | /* On x86_32, these are no better than the atomic variants. | |
153 | * On x86-64 these are better than the atomic variants on SMP kernels | |
154 | * because they dont use a lock prefix. | |
155 | */ | |
156 | #define __local_inc(l) local_inc(l) | |
157 | #define __local_dec(l) local_dec(l) | |
01c57fb6 HH |
158 | #define __local_add(i, l) local_add((i), (l)) |
159 | #define __local_sub(i, l) local_sub((i), (l)) | |
5638f993 | 160 | |
1965aae3 | 161 | #endif /* _ASM_X86_LOCAL_H */ |