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
|
#ifndef __XEN_SYNCH_BITOPS_H__
#define __XEN_SYNCH_BITOPS_H__
/*
* Copyright 1992, Linus Torvalds.
* Heavily modified to provide guaranteed strong synchronisation
* when communicating with Xen or other guest OSes running on other CPUs.
*/
#include <linux/config.h>
#define ADDR (*(volatile long *) addr)
static __inline__ void synch_set_bit(int nr, volatile void * addr)
{
__asm__ __volatile__ (
"lock btsl %1,%0"
: "=m" (ADDR) : "Ir" (nr) : "memory" );
}
static __inline__ void synch_clear_bit(int nr, volatile void * addr)
{
__asm__ __volatile__ (
"lock btrl %1,%0"
: "=m" (ADDR) : "Ir" (nr) : "memory" );
}
static __inline__ void synch_change_bit(int nr, volatile void * addr)
{
__asm__ __volatile__ (
"lock btcl %1,%0"
: "=m" (ADDR) : "Ir" (nr) : "memory" );
}
static __inline__ int synch_test_and_set_bit(int nr, volatile void * addr)
{
int oldbit;
__asm__ __volatile__ (
"lock btsl %2,%1\n\tsbbl %0,%0"
: "=r" (oldbit), "=m" (ADDR) : "Ir" (nr) : "memory");
return oldbit;
}
static __inline__ int synch_test_and_clear_bit(int nr, volatile void * addr)
{
int oldbit;
__asm__ __volatile__ (
"lock btrl %2,%1\n\tsbbl %0,%0"
: "=r" (oldbit), "=m" (ADDR) : "Ir" (nr) : "memory");
return oldbit;
}
static __inline__ int synch_test_and_change_bit(int nr, volatile void * addr)
{
int oldbit;
__asm__ __volatile__ (
"lock btcl %2,%1\n\tsbbl %0,%0"
: "=r" (oldbit), "=m" (ADDR) : "Ir" (nr) : "memory");
return oldbit;
}
static __inline__ int synch_const_test_bit(int nr, const volatile void * addr)
{
return ((1UL << (nr & 31)) &
(((const volatile unsigned int *) addr)[nr >> 5])) != 0;
}
static __inline__ int synch_var_test_bit(int nr, volatile void * addr)
{
int oldbit;
__asm__ __volatile__ (
"btl %2,%1\n\tsbbl %0,%0"
: "=r" (oldbit) : "m" (ADDR), "Ir" (nr) );
return oldbit;
}
#define synch_test_bit(nr,addr) \
(__builtin_constant_p(nr) ? \
synch_const_test_bit((nr),(addr)) : \
synch_var_test_bit((nr),(addr)))
#endif /* __XEN_SYNCH_BITOPS_H__ */
|
