1#ifndef _LINUX_TIME_H
2#define _LINUX_TIME_H
3
4#include <linux/types.h>
5
6#ifdef __KERNEL__
7# include <linux/seqlock.h>
8#endif
9
10#ifndef _STRUCT_TIMESPEC
11#define _STRUCT_TIMESPEC
12struct timespec {
13	time_t	tv_sec;		/* seconds */
14	long	tv_nsec;	/* nanoseconds */
15};
16#endif
17
18struct timeval {
19	time_t		tv_sec;		/* seconds */
20	suseconds_t	tv_usec;	/* microseconds */
21};
22
23struct timezone {
24	int	tz_minuteswest;	/* minutes west of Greenwich */
25	int	tz_dsttime;	/* type of dst correction */
26};
27
28#ifdef __KERNEL__
29
30/* Parameters used to convert the timespec values: */
31#define MSEC_PER_SEC	1000L
32#define USEC_PER_MSEC	1000L
33#define NSEC_PER_USEC	1000L
34#define NSEC_PER_MSEC	1000000L
35#define USEC_PER_SEC	1000000L
36#define NSEC_PER_SEC	1000000000L
37#define FSEC_PER_SEC	1000000000000000L
38
39static inline int timespec_equal(struct timespec *a, struct timespec *b)
40{
41	return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
42}
43
44/*
45 * lhs < rhs:  return <0
46 * lhs == rhs: return 0
47 * lhs > rhs:  return >0
48 */
49static inline int timespec_compare(struct timespec *lhs, struct timespec *rhs)
50{
51	if (lhs->tv_sec < rhs->tv_sec)
52		return -1;
53	if (lhs->tv_sec > rhs->tv_sec)
54		return 1;
55	return lhs->tv_nsec - rhs->tv_nsec;
56}
57
58static inline int timeval_compare(struct timeval *lhs, struct timeval *rhs)
59{
60	if (lhs->tv_sec < rhs->tv_sec)
61		return -1;
62	if (lhs->tv_sec > rhs->tv_sec)
63		return 1;
64	return lhs->tv_usec - rhs->tv_usec;
65}
66
67extern unsigned long mktime(const unsigned int year, const unsigned int mon,
68			    const unsigned int day, const unsigned int hour,
69			    const unsigned int min, const unsigned int sec);
70
71extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
72
73/*
74 * sub = lhs - rhs, in normalized form
75 */
76static inline struct timespec timespec_sub(struct timespec lhs,
77						struct timespec rhs)
78{
79	struct timespec ts_delta;
80	set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
81				lhs.tv_nsec - rhs.tv_nsec);
82	return ts_delta;
83}
84
85/*
86 * Returns true if the timespec is norm, false if denorm:
87 */
88#define timespec_valid(ts) \
89	(((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
90
91extern struct timespec xtime;
92extern struct timespec wall_to_monotonic;
93extern seqlock_t xtime_lock;
94
95void timekeeping_init(void);
96
97static inline unsigned long get_seconds(void)
98{
99	return xtime.tv_sec;
100}
101
102struct timespec current_kernel_time(void);
103
104#define CURRENT_TIME		(current_kernel_time())
105#define CURRENT_TIME_SEC	((struct timespec) { xtime.tv_sec, 0 })
106
107extern void do_gettimeofday(struct timeval *tv);
108extern int do_settimeofday(struct timespec *tv);
109extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
110#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
111extern long do_utimes(int dfd, char __user *filename, struct timeval *times);
112struct itimerval;
113extern int do_setitimer(int which, struct itimerval *value,
114			struct itimerval *ovalue);
115extern unsigned int alarm_setitimer(unsigned int seconds);
116extern int do_getitimer(int which, struct itimerval *value);
117extern void getnstimeofday(struct timespec *tv);
118
119extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
120extern int timekeeping_is_continuous(void);
121
122/**
123 * timespec_to_ns - Convert timespec to nanoseconds
124 * @ts:		pointer to the timespec variable to be converted
125 *
126 * Returns the scalar nanosecond representation of the timespec
127 * parameter.
128 */
129static inline s64 timespec_to_ns(const struct timespec *ts)
130{
131	return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
132}
133
134/**
135 * timeval_to_ns - Convert timeval to nanoseconds
136 * @ts:		pointer to the timeval variable to be converted
137 *
138 * Returns the scalar nanosecond representation of the timeval
139 * parameter.
140 */
141static inline s64 timeval_to_ns(const struct timeval *tv)
142{
143	return ((s64) tv->tv_sec * NSEC_PER_SEC) +
144		tv->tv_usec * NSEC_PER_USEC;
145}
146
147/**
148 * ns_to_timespec - Convert nanoseconds to timespec
149 * @nsec:	the nanoseconds value to be converted
150 *
151 * Returns the timespec representation of the nsec parameter.
152 */
153extern struct timespec ns_to_timespec(const s64 nsec);
154
155/**
156 * ns_to_timeval - Convert nanoseconds to timeval
157 * @nsec:	the nanoseconds value to be converted
158 *
159 * Returns the timeval representation of the nsec parameter.
160 */
161extern struct timeval ns_to_timeval(const s64 nsec);
162
163/**
164 * timespec_add_ns - Adds nanoseconds to a timespec
165 * @a:		pointer to timespec to be incremented
166 * @ns:		unsigned nanoseconds value to be added
167 */
168static inline void timespec_add_ns(struct timespec *a, u64 ns)
169{
170	ns += a->tv_nsec;
171	while(unlikely(ns >= NSEC_PER_SEC)) {
172		ns -= NSEC_PER_SEC;
173		a->tv_sec++;
174	}
175	a->tv_nsec = ns;
176}
177#endif /* __KERNEL__ */
178
179#define NFDBITS			__NFDBITS
180
181#define FD_SETSIZE		__FD_SETSIZE
182#define FD_SET(fd,fdsetp)	__FD_SET(fd,fdsetp)
183#define FD_CLR(fd,fdsetp)	__FD_CLR(fd,fdsetp)
184#define FD_ISSET(fd,fdsetp)	__FD_ISSET(fd,fdsetp)
185#define FD_ZERO(fdsetp)		__FD_ZERO(fdsetp)
186
187/*
188 * Names of the interval timers, and structure
189 * defining a timer setting:
190 */
191#define	ITIMER_REAL		0
192#define	ITIMER_VIRTUAL		1
193#define	ITIMER_PROF		2
194
195struct itimerspec {
196	struct timespec it_interval;	/* timer period */
197	struct timespec it_value;	/* timer expiration */
198};
199
200struct itimerval {
201	struct timeval it_interval;	/* timer interval */
202	struct timeval it_value;	/* current value */
203};
204
205/*
206 * The IDs of the various system clocks (for POSIX.1b interval timers):
207 */
208#define CLOCK_REALTIME			0
209#define CLOCK_MONOTONIC			1
210#define CLOCK_PROCESS_CPUTIME_ID	2
211#define CLOCK_THREAD_CPUTIME_ID		3
212
213/*
214 * The IDs of various hardware clocks:
215 */
216#define CLOCK_SGI_CYCLE			10
217#define MAX_CLOCKS			16
218#define CLOCKS_MASK			(CLOCK_REALTIME | CLOCK_MONOTONIC)
219#define CLOCKS_MONO			CLOCK_MONOTONIC
220
221/*
222 * The various flags for setting POSIX.1b interval timers:
223 */
224#define TIMER_ABSTIME			0x01
225
226#endif
227