summaryrefslogtreecommitdiff
path: root/arch/arm/include/asm/vdso/gettimeofday.h
blob: fe6e1f65932d5fb363629a206d5e6cf18220f5b4 (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
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
131
132
133
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2018 ARM Limited
 */
#ifndef __ASM_VDSO_GETTIMEOFDAY_H
#define __ASM_VDSO_GETTIMEOFDAY_H

#ifndef __ASSEMBLY__

#include <asm/barrier.h>
#include <asm/cp15.h>
#include <asm/unistd.h>
#include <uapi/linux/time.h>

#define VDSO_HAS_CLOCK_GETRES		1

extern struct vdso_data *__get_datapage(void);

static __always_inline int gettimeofday_fallback(
				struct __kernel_old_timeval *_tv,
				struct timezone *_tz)
{
	register struct timezone *tz asm("r1") = _tz;
	register struct __kernel_old_timeval *tv asm("r0") = _tv;
	register long ret asm ("r0");
	register long nr asm("r7") = __NR_gettimeofday;

	asm volatile(
	"	swi #0\n"
	: "=r" (ret)
	: "r" (tv), "r" (tz), "r" (nr)
	: "memory");

	return ret;
}

static __always_inline long clock_gettime_fallback(
					clockid_t _clkid,
					struct __kernel_timespec *_ts)
{
	register struct __kernel_timespec *ts asm("r1") = _ts;
	register clockid_t clkid asm("r0") = _clkid;
	register long ret asm ("r0");
	register long nr asm("r7") = __NR_clock_gettime64;

	asm volatile(
	"	swi #0\n"
	: "=r" (ret)
	: "r" (clkid), "r" (ts), "r" (nr)
	: "memory");

	return ret;
}

static __always_inline long clock_gettime32_fallback(
					clockid_t _clkid,
					struct old_timespec32 *_ts)
{
	register struct old_timespec32 *ts asm("r1") = _ts;
	register clockid_t clkid asm("r0") = _clkid;
	register long ret asm ("r0");
	register long nr asm("r7") = __NR_clock_gettime;

	asm volatile(
	"	swi #0\n"
	: "=r" (ret)
	: "r" (clkid), "r" (ts), "r" (nr)
	: "memory");

	return ret;
}

static __always_inline int clock_getres_fallback(
					clockid_t _clkid,
					struct __kernel_timespec *_ts)
{
	register struct __kernel_timespec *ts asm("r1") = _ts;
	register clockid_t clkid asm("r0") = _clkid;
	register long ret asm ("r0");
	register long nr asm("r7") = __NR_clock_getres_time64;

	asm volatile(
	"       swi #0\n"
	: "=r" (ret)
	: "r" (clkid), "r" (ts), "r" (nr)
	: "memory");

	return ret;
}

static __always_inline int clock_getres32_fallback(
					clockid_t _clkid,
					struct old_timespec32 *_ts)
{
	register struct old_timespec32 *ts asm("r1") = _ts;
	register clockid_t clkid asm("r0") = _clkid;
	register long ret asm ("r0");
	register long nr asm("r7") = __NR_clock_getres;

	asm volatile(
	"       swi #0\n"
	: "=r" (ret)
	: "r" (clkid), "r" (ts), "r" (nr)
	: "memory");

	return ret;
}

static __always_inline u64 __arch_get_hw_counter(int clock_mode)
{
#ifdef CONFIG_ARM_ARCH_TIMER
	u64 cycle_now;

	if (!clock_mode)
		return -EINVAL;

	isb();
	cycle_now = read_sysreg(CNTVCT);

	return cycle_now;
#else
	return -EINVAL; /* use fallback */
#endif
}

static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
{
	return __get_datapage();
}

#endif /* !__ASSEMBLY__ */

#endif /* __ASM_VDSO_GETTIMEOFDAY_H */