blob: f556c4843aa18af74359dfeb2a41d39d9a2c3bb9 (
plain)
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
|
#ifndef _ASM_X86_VGTOD_H
#define _ASM_X86_VGTOD_H
#include <linux/compiler.h>
#include <linux/clocksource.h>
#ifdef BUILD_VDSO32_64
typedef u64 gtod_long_t;
#else
typedef unsigned long gtod_long_t;
#endif
/*
* vsyscall_gtod_data will be accessed by 32 and 64 bit code at the same time
* so be carefull by modifying this structure.
*/
struct vsyscall_gtod_data {
unsigned seq;
int vclock_mode;
cycle_t cycle_last;
cycle_t mask;
u32 mult;
u32 shift;
/* open coded 'struct timespec' */
u64 wall_time_snsec;
gtod_long_t wall_time_sec;
gtod_long_t monotonic_time_sec;
u64 monotonic_time_snsec;
gtod_long_t wall_time_coarse_sec;
gtod_long_t wall_time_coarse_nsec;
gtod_long_t monotonic_time_coarse_sec;
gtod_long_t monotonic_time_coarse_nsec;
int tz_minuteswest;
int tz_dsttime;
};
extern struct vsyscall_gtod_data vsyscall_gtod_data;
static inline unsigned gtod_read_begin(const struct vsyscall_gtod_data *s)
{
unsigned ret;
repeat:
ret = ACCESS_ONCE(s->seq);
if (unlikely(ret & 1)) {
cpu_relax();
goto repeat;
}
smp_rmb();
return ret;
}
static inline int gtod_read_retry(const struct vsyscall_gtod_data *s,
unsigned start)
{
smp_rmb();
return unlikely(s->seq != start);
}
static inline void gtod_write_begin(struct vsyscall_gtod_data *s)
{
++s->seq;
smp_wmb();
}
static inline void gtod_write_end(struct vsyscall_gtod_data *s)
{
smp_wmb();
++s->seq;
}
#ifdef CONFIG_X86_64
#define VGETCPU_CPU_MASK 0xfff
static inline unsigned int __getcpu(void)
{
unsigned int p;
/*
* Load per CPU data from GDT. LSL is faster than RDTSCP and
* works on all CPUs. This is volatile so that it orders
* correctly wrt barrier() and to keep gcc from cleverly
* hoisting it out of the calling function.
*/
asm volatile ("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));
return p;
}
#endif /* CONFIG_X86_64 */
#endif /* _ASM_X86_VGTOD_H */
|
