include/linux/time.h - kernel/msm-4.9 - Gitiles

 #ifndef _LINUX_TIME_H
 #define _LINUX_TIME_H

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

 extern struct timezone sys_tz;

 /* 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

 #define TIME_T_MAX	(time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)

 static inline int timespec_equal(const struct timespec *a,
                                  const struct timespec *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 timespec_compare(const struct timespec *lhs, const struct timespec *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;
 }

 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
 {
 	if (lhs->tv_sec < rhs->tv_sec)
 		return -1;
 	if (lhs->tv_sec > rhs->tv_sec)
 		return 1;
 	return lhs->tv_usec - rhs->tv_usec;
 }

 extern unsigned long mktime(const unsigned int year, const unsigned int mon,
 			    const unsigned int day, const unsigned int hour,
 			    const unsigned int min, const unsigned int sec);

 extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);

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


 static inline struct timespec timespec_add(struct timespec lhs,
 						struct timespec rhs)
 {
 	struct timespec ts_delta;
 	set_normalized_timespec(&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 timespec timespec_sub(struct timespec lhs,
 						struct timespec rhs)
 {
 	struct timespec ts_delta;
 	set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
 				lhs.tv_nsec - rhs.tv_nsec);
 	return ts_delta;
 }

 #define KTIME_MAX			((s64)~((u64)1 << 63))
 #if (BITS_PER_LONG == 64)
 # define KTIME_SEC_MAX			(KTIME_MAX / NSEC_PER_SEC)
 #else
 # define KTIME_SEC_MAX			LONG_MAX
 #endif

 /*
  * Returns true if the timespec is norm, false if denorm:
  */
 static inline bool timespec_valid(const struct timespec *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 timespec_valid_strict(const struct timespec *ts)
 {
 	if (!timespec_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;
 }

 extern bool persistent_clock_exist;

 static inline bool has_persistent_clock(void)
 {
 	return persistent_clock_exist;
 }

 extern void read_persistent_clock(struct timespec *ts);
 extern void read_boot_clock(struct timespec *ts);
 extern int persistent_clock_is_local;
 extern int update_persistent_clock(struct timespec now);
 void timekeeping_init(void);
 extern int timekeeping_suspended;

 unsigned long get_seconds(void);
 struct timespec current_kernel_time(void);
 struct timespec __current_kernel_time(void); /* does not take xtime_lock */
 struct timespec get_monotonic_coarse(void);
 void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
 				struct timespec *wtom, struct timespec *sleep);
 void timekeeping_inject_sleeptime(struct timespec *delta);

 #define CURRENT_TIME		(current_kernel_time())
 #define CURRENT_TIME_SEC	((struct timespec) { get_seconds(), 0 })

 /* Some architectures do not supply their own clocksource.
  * This is mainly the case in architectures that get their
  * inter-tick times by reading the counter on their interval
  * timer. Since these timers wrap every tick, they're not really
  * useful as clocksources. Wrapping them to act like one is possible
  * but not very efficient. So we provide a callout these arches
  * can implement for use with the jiffies clocksource to provide
  * finer then tick granular time.
  */
 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
 extern u32 (*arch_gettimeoffset)(void);
 #endif

 extern void do_gettimeofday(struct timeval *tv);
 extern int do_settimeofday(const struct timespec *tv);
 extern int do_sys_settimeofday(const struct timespec *tv,
 			       const struct timezone *tz);
 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
 struct itimerval;
 extern int do_setitimer(int which, struct itimerval *value,
 			struct itimerval *ovalue);
 extern unsigned int alarm_setitimer(unsigned int seconds);
 extern int do_getitimer(int which, struct itimerval *value);
 extern int __getnstimeofday(struct timespec *tv);
 extern void getnstimeofday(struct timespec *tv);
 extern void getrawmonotonic(struct timespec *ts);
 extern void getnstime_raw_and_real(struct timespec *ts_raw,
 		struct timespec *ts_real);
 extern void getboottime(struct timespec *ts);
 extern void monotonic_to_bootbased(struct timespec *ts);
 extern void get_monotonic_boottime(struct timespec *ts);

 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
 extern int timekeeping_valid_for_hres(void);
 extern u64 timekeeping_max_deferment(void);
 extern int timekeeping_inject_offset(struct timespec *ts);
 extern s32 timekeeping_get_tai_offset(void);
 extern void timekeeping_set_tai_offset(s32 tai_offset);
 extern void timekeeping_clocktai(struct timespec *ts);

 struct tms;
 extern void do_sys_times(struct tms *);

 /*
  * Similar to the struct tm in userspace <time.h>, but it needs to be here so
  * that the kernel source is self contained.
  */
 struct tm {
 	/*
 	 * the number of seconds after the minute, normally in the range
 	 * 0 to 59, but can be up to 60 to allow for leap seconds
 	 */
 	int tm_sec;
 	/* the number of minutes after the hour, in the range 0 to 59*/
 	int tm_min;
 	/* the number of hours past midnight, in the range 0 to 23 */
 	int tm_hour;
 	/* the day of the month, in the range 1 to 31 */
 	int tm_mday;
 	/* the number of months since January, in the range 0 to 11 */
 	int tm_mon;
 	/* the number of years since 1900 */
 	long tm_year;
 	/* the number of days since Sunday, in the range 0 to 6 */
 	int tm_wday;
 	/* the number of days since January 1, in the range 0 to 365 */
 	int tm_yday;
 };

 void time_to_tm(time_t totalsecs, int offset, struct tm *result);

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

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

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

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

 /**
  * timespec_add_ns - Adds nanoseconds to a timespec
  * @a:		pointer to timespec 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 timespec_add_ns(struct timespec *a, u64 ns)
 {
 	a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
 	a->tv_nsec = ns;
 }

 #endif
	#ifndef _LINUX_TIME_H
	#define _LINUX_TIME_H

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

	extern struct timezone sys_tz;

	/* 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

	#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)

	static inline int timespec_equal(const struct timespec *a,
	const struct timespec *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 timespec_compare(const struct timespec lhs, const struct timespec 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;
	}

	static inline int timeval_compare(const struct timeval lhs, const struct timeval rhs)
	{
	if (lhs->tv_sec < rhs->tv_sec)
	return -1;
	if (lhs->tv_sec > rhs->tv_sec)
	return 1;
	return lhs->tv_usec - rhs->tv_usec;
	}

	extern unsigned long mktime(const unsigned int year, const unsigned int mon,
	const unsigned int day, const unsigned int hour,
	const unsigned int min, const unsigned int sec);

	extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);

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


	static inline struct timespec timespec_add(struct timespec lhs,
	struct timespec rhs)
	{
	struct timespec ts_delta;
	set_normalized_timespec(&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 timespec timespec_sub(struct timespec lhs,
	struct timespec rhs)
	{
	struct timespec ts_delta;
	set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
	lhs.tv_nsec - rhs.tv_nsec);
	return ts_delta;
	}

	#define KTIME_MAX ((s64)~((u64)1 << 63))
	#if (BITS_PER_LONG == 64)
	# define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
	#else
	# define KTIME_SEC_MAX LONG_MAX
	#endif

	/*
	* Returns true if the timespec is norm, false if denorm:
	*/
	static inline bool timespec_valid(const struct timespec *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 timespec_valid_strict(const struct timespec *ts)
	{
	if (!timespec_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;
	}

	extern bool persistent_clock_exist;

	static inline bool has_persistent_clock(void)
	{
	return persistent_clock_exist;
	}

	extern void read_persistent_clock(struct timespec *ts);
	extern void read_boot_clock(struct timespec *ts);
	extern int persistent_clock_is_local;
	extern int update_persistent_clock(struct timespec now);
	void timekeeping_init(void);
	extern int timekeeping_suspended;

	unsigned long get_seconds(void);
	struct timespec current_kernel_time(void);
	struct timespec __current_kernel_time(void); /* does not take xtime_lock */
	struct timespec get_monotonic_coarse(void);
	void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
	struct timespec wtom, struct timespec sleep);
	void timekeeping_inject_sleeptime(struct timespec *delta);

	#define CURRENT_TIME (current_kernel_time())
	#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })

	/* Some architectures do not supply their own clocksource.
	* This is mainly the case in architectures that get their
	* inter-tick times by reading the counter on their interval
	* timer. Since these timers wrap every tick, they're not really
	* useful as clocksources. Wrapping them to act like one is possible
	* but not very efficient. So we provide a callout these arches
	* can implement for use with the jiffies clocksource to provide
	* finer then tick granular time.
	*/
	#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
	extern u32 (*arch_gettimeoffset)(void);
	#endif

	extern void do_gettimeofday(struct timeval *tv);
	extern int do_settimeofday(const struct timespec *tv);
	extern int do_sys_settimeofday(const struct timespec *tv,
	const struct timezone *tz);
	#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
	extern long do_utimes(int dfd, const char __user filename, struct timespec times, int flags);
	struct itimerval;
	extern int do_setitimer(int which, struct itimerval *value,
	struct itimerval *ovalue);
	extern unsigned int alarm_setitimer(unsigned int seconds);
	extern int do_getitimer(int which, struct itimerval *value);
	extern int __getnstimeofday(struct timespec *tv);
	extern void getnstimeofday(struct timespec *tv);
	extern void getrawmonotonic(struct timespec *ts);
	extern void getnstime_raw_and_real(struct timespec *ts_raw,
	struct timespec *ts_real);
	extern void getboottime(struct timespec *ts);
	extern void monotonic_to_bootbased(struct timespec *ts);
	extern void get_monotonic_boottime(struct timespec *ts);

	extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
	extern int timekeeping_valid_for_hres(void);
	extern u64 timekeeping_max_deferment(void);
	extern int timekeeping_inject_offset(struct timespec *ts);
	extern s32 timekeeping_get_tai_offset(void);
	extern void timekeeping_set_tai_offset(s32 tai_offset);
	extern void timekeeping_clocktai(struct timespec *ts);

	struct tms;
	extern void do_sys_times(struct tms *);

	/*
	* Similar to the struct tm in userspace <time.h>, but it needs to be here so
	* that the kernel source is self contained.
	*/
	struct tm {
	/*
	* the number of seconds after the minute, normally in the range
	* 0 to 59, but can be up to 60 to allow for leap seconds
	*/
	int tm_sec;
	/* the number of minutes after the hour, in the range 0 to 59*/
	int tm_min;
	/* the number of hours past midnight, in the range 0 to 23 */
	int tm_hour;
	/* the day of the month, in the range 1 to 31 */
	int tm_mday;
	/* the number of months since January, in the range 0 to 11 */
	int tm_mon;
	/* the number of years since 1900 */
	long tm_year;
	/* the number of days since Sunday, in the range 0 to 6 */
	int tm_wday;
	/* the number of days since January 1, in the range 0 to 365 */
	int tm_yday;
	};

	void time_to_tm(time_t totalsecs, int offset, struct tm *result);

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

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

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

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

	/**
	* timespec_add_ns - Adds nanoseconds to a timespec
	* @a: pointer to timespec 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 timespec_add_ns(struct timespec *a, u64 ns)
	{
	a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
	a->tv_nsec = ns;
	}

	#endif