summaryrefslogtreecommitdiff
path: root/include/linux/time64.h
blob: 77b5df2acd2adde021954ae8275b9f39d19c7c0f (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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
#ifndef _LINUX_TIME64_H
#define _LINUX_TIME64_H

#include <uapi/linux/time.h>
#include <linux/math64.h>

typedef __s64 time64_t;

/*
 * This wants to go into uapi/linux/time.h once we agreed about the
 * userspace interfaces.
 */
#if __BITS_PER_LONG == 64
# define timespec64 timespec
#else
struct timespec64 {
	time64_t	tv_sec;			/* seconds */
	long		tv_nsec;		/* nanoseconds */
};
#endif

/* Parameters used to convert the timespec values: */
#define MSEC_PER_SEC	1000L
#define USEC_PER_MSEC	1000L
#define NSEC_PER_USEC	1000L
#define NSEC_PER_MSEC	1000000L
#define USEC_PER_SEC	1000000L
#define NSEC_PER_SEC	1000000000L
#define FSEC_PER_SEC	1000000000000000LL

/* Located here for timespec[64]_valid_strict */
#define TIME64_MAX			((s64)~((u64)1 << 63))
#define KTIME_MAX			((s64)~((u64)1 << 63))
#define KTIME_SEC_MAX			(KTIME_MAX / NSEC_PER_SEC)

#if __BITS_PER_LONG == 64

static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
{
	return ts64;
}

static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
{
	return ts;
}

# define timespec64_equal		timespec_equal
# define timespec64_compare		timespec_compare
# define set_normalized_timespec64	set_normalized_timespec
# define timespec64_add_safe		timespec_add_safe
# define timespec64_add			timespec_add
# define timespec64_sub			timespec_sub
# define timespec64_valid		timespec_valid
# define timespec64_valid_strict	timespec_valid_strict
# define timespec64_to_ns		timespec_to_ns
# define ns_to_timespec64		ns_to_timespec
# define timespec64_add_ns		timespec_add_ns

#else

static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
{
	struct timespec ret;

	ret.tv_sec = (time_t)ts64.tv_sec;
	ret.tv_nsec = ts64.tv_nsec;
	return ret;
}

static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
{
	struct timespec64 ret;

	ret.tv_sec = ts.tv_sec;
	ret.tv_nsec = ts.tv_nsec;
	return ret;
}

static inline int timespec64_equal(const struct timespec64 *a,
				   const struct timespec64 *b)
{
	return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
}

/*
 * lhs < rhs:  return <0
 * lhs == rhs: return 0
 * lhs > rhs:  return >0
 */
static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs)
{
	if (lhs->tv_sec < rhs->tv_sec)
		return -1;
	if (lhs->tv_sec > rhs->tv_sec)
		return 1;
	return lhs->tv_nsec - rhs->tv_nsec;
}

extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);

/*
 * timespec64_add_safe assumes both values are positive and checks for
 * overflow. It will return TIME_T_MAX if the returned value would be
 * smaller then either of the arguments.
 */
extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
					 const struct timespec64 rhs);


static inline struct timespec64 timespec64_add(struct timespec64 lhs,
						struct timespec64 rhs)
{
	struct timespec64 ts_delta;
	set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec,
				lhs.tv_nsec + rhs.tv_nsec);
	return ts_delta;
}

/*
 * sub = lhs - rhs, in normalized form
 */
static inline struct timespec64 timespec64_sub(struct timespec64 lhs,
						struct timespec64 rhs)
{
	struct timespec64 ts_delta;
	set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
				lhs.tv_nsec - rhs.tv_nsec);
	return ts_delta;
}

/*
 * Returns true if the timespec64 is norm, false if denorm:
 */
static inline bool timespec64_valid(const struct timespec64 *ts)
{
	/* Dates before 1970 are bogus */
	if (ts->tv_sec < 0)
		return false;
	/* Can't have more nanoseconds then a second */
	if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
		return false;
	return true;
}

static inline bool timespec64_valid_strict(const struct timespec64 *ts)
{
	if (!timespec64_valid(ts))
		return false;
	/* Disallow values that could overflow ktime_t */
	if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
		return false;
	return true;
}

/**
 * timespec64_to_ns - Convert timespec64 to nanoseconds
 * @ts:		pointer to the timespec64 variable to be converted
 *
 * Returns the scalar nanosecond representation of the timespec64
 * parameter.
 */
static inline s64 timespec64_to_ns(const struct timespec64 *ts)
{
	return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
}

/**
 * ns_to_timespec64 - Convert nanoseconds to timespec64
 * @nsec:	the nanoseconds value to be converted
 *
 * Returns the timespec64 representation of the nsec parameter.
 */
extern struct timespec64 ns_to_timespec64(const s64 nsec);

/**
 * timespec64_add_ns - Adds nanoseconds to a timespec64
 * @a:		pointer to timespec64 to be incremented
 * @ns:		unsigned nanoseconds value to be added
 *
 * This must always be inlined because its used from the x86-64 vdso,
 * which cannot call other kernel functions.
 */
static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns)
{
	a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
	a->tv_nsec = ns;
}

#endif

#endif /* _LINUX_TIME64_H */