1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
#ifndef _ASM_X86_SYNC_BITOPS_H
#define _ASM_X86_SYNC_BITOPS_H
/*
* Copyright 1992, Linus Torvalds.
*/
/*
* These have to be done with inline assembly: that way the bit-setting
* is guaranteed to be atomic. All bit operations return 0 if the bit
* was cleared before the operation and != 0 if it was not.
*
* bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
*/
#define ADDR (*(volatile long *)addr)
/**
* sync_set_bit - Atomically set a bit in memory
* @nr: the bit to set
* @addr: the address to start counting from
*
* This function is atomic and may not be reordered. See __set_bit()
* if you do not require the atomic guarantees.
*
* Note that @nr may be almost arbitrarily large; this function is not
* restricted to acting on a single-word quantity.
*/
static inline void sync_set_bit(long nr, volatile unsigned long *addr)
{
asm volatile("lock; bts %1,%0"
: "+m" (ADDR)
: "Ir" (nr)
: "memory");
}
/**
* sync_clear_bit - Clears a bit in memory
* @nr: Bit to clear
* @addr: Address to start counting from
*
* sync_clear_bit() is atomic and may not be reordered. However, it does
* not contain a memory barrier, so if it is used for locking purposes,
* you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
* in order to ensure changes are visible on other processors.
*/
static inline void sync_clear_bit(long nr, volatile unsigned long *addr)
{
asm volatile("lock; btr %1,%0"
: "+m" (ADDR)
: "Ir" (nr)
: "memory");
}
/**
* sync_change_bit - Toggle a bit in memory
* @nr: Bit to change
* @addr: Address to start counting from
*
* sync_change_bit() is atomic and may not be reordered.
* Note that @nr may be almost arbitrarily large; this function is not
* restricted to acting on a single-word quantity.
*/
static inline void sync_change_bit(long nr, volatile unsigned long *addr)
{
asm volatile("lock; btc %1,%0"
: "+m" (ADDR)
: "Ir" (nr)
: "memory");
}
/**
* sync_test_and_set_bit - Set a bit and return its old value
* @nr: Bit to set
* @addr: Address to count from
*
* This operation is atomic and cannot be reordered.
* It also implies a memory barrier.
*/
static inline int sync_test_and_set_bit(long nr, volatile unsigned long *addr)
{
int oldbit;
asm volatile("lock; bts %2,%1\n\tsbbl %0,%0"
: "=r" (oldbit), "+m" (ADDR)
: "Ir" (nr) : "memory");
return oldbit;
}
/**
* sync_test_and_clear_bit - Clear a bit and return its old value
* @nr: Bit to clear
* @addr: Address to count from
*
* This operation is atomic and cannot be reordered.
* It also implies a memory barrier.
*/
static inline int sync_test_and_clear_bit(long nr, volatile unsigned long *addr)
{
int oldbit;
asm volatile("lock; btr %2,%1\n\tsbbl %0,%0"
: "=r" (oldbit), "+m" (ADDR)
: "Ir" (nr) : "memory");
return oldbit;
}
/**
* sync_test_and_change_bit - Change a bit and return its old value
* @nr: Bit to change
* @addr: Address to count from
*
* This operation is atomic and cannot be reordered.
* It also implies a memory barrier.
*/
static inline int sync_test_and_change_bit(long nr, volatile unsigned long *addr)
{
int oldbit;
asm volatile("lock; btc %2,%1\n\tsbbl %0,%0"
: "=r" (oldbit), "+m" (ADDR)
: "Ir" (nr) : "memory");
return oldbit;
}
#define sync_test_bit(nr, addr) test_bit(nr, addr)
#undef ADDR
#endif /* _ASM_X86_SYNC_BITOPS_H */
|
