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/*

 *  include/linux/ktime.h

 *

 *  ktime_t - nanosecond-resolution time format.

 *

 *   Copyright(C) 2005, Thomas Gleixner 

 *   Copyright(C) 2005, Red Hat, Inc., Ingo Molnar

 *

 *  data type definitions, declarations, prototypes and macros.

 *

 *  Started by: Thomas Gleixner and Ingo Molnar

 *

 *  Credits:

 *

 *  	Roman Zippel provided the ideas and primary code snippets of

 *  	the ktime_t union and further simplifications of the original

 *  	code.

 *

 *  For licencing details see kernel-base/COPYING

 */

#ifndef _LINUX_KTIME_H

#define _LINUX_KTIME_H

#include 

#include 

/*

 * ktime_t:

 *

 * A single 64-bit variable is used to store the hrtimers

 * internal representation of time values in scalar nanoseconds. The

 * design plays out best on 64-bit CPUs, where most conversions are

 * NOPs and most arithmetic ktime_t operations are plain arithmetic

 * operations.

 *

 */

union ktime {

	s64	tv64;

};

typedef union ktime ktime_t;		/* Kill this */

/**

 * ktime_set - Set a ktime_t variable from a seconds/nanoseconds value

 * @secs:	seconds to set

 * @nsecs:	nanoseconds to set

 *

 * Return: The ktime_t representation of the value.

 */

static inline ktime_t ktime_set(const s64 secs, const unsigned long nsecs)

{

	if (unlikely(secs >= KTIME_SEC_MAX))

		return (ktime_t){ .tv64 = KTIME_MAX };

	return (ktime_t) { .tv64 = secs * NSEC_PER_SEC + (s64)nsecs };

}

/* Subtract two ktime_t variables. rem = lhs -rhs: */

#define ktime_sub(lhs, rhs) \

		({ (ktime_t){ .tv64 = (lhs).tv64 - (rhs).tv64 }; })

/* Add two ktime_t variables. res = lhs + rhs: */

#define ktime_add(lhs, rhs) \

		({ (ktime_t){ .tv64 = (lhs).tv64 + (rhs).tv64 }; })

/*

 * Add a ktime_t variable and a scalar nanosecond value.

 * res = kt + nsval:

 */

#define ktime_add_ns(kt, nsval) \

		({ (ktime_t){ .tv64 = (kt).tv64 + (nsval) }; })

/*

 * Subtract a scalar nanosecod from a ktime_t variable

 * res = kt - nsval:

 */

#define ktime_sub_ns(kt, nsval) \

		({ (ktime_t){ .tv64 = (kt).tv64 - (nsval) }; })

/* convert a timespec to ktime_t format: */

static inline ktime_t timespec_to_ktime(struct timespec ts)

{

	return ktime_set(ts.tv_sec, ts.tv_nsec);

}

/* convert a timespec64 to ktime_t format: */

static inline ktime_t timespec64_to_ktime(struct timespec64 ts)

{

	return ktime_set(ts.tv_sec, ts.tv_nsec);

}

/* convert a timeval to ktime_t format: */

static inline ktime_t timeval_to_ktime(struct timeval tv)

{

	return ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC);

}

/* Map the ktime_t to timespec conversion to ns_to_timespec function */

#define ktime_to_timespec(kt)		ns_to_timespec((kt).tv64)

/* Map the ktime_t to timespec conversion to ns_to_timespec function */

#define ktime_to_timespec64(kt)		ns_to_timespec64((kt).tv64)

/* Map the ktime_t to timeval conversion to ns_to_timeval function */

#define ktime_to_timeval(kt)		ns_to_timeval((kt).tv64)

/* Convert ktime_t to nanoseconds - NOP in the scalar storage format: */

#define ktime_to_ns(kt)			((kt).tv64)

/**

 * ktime_equal - Compares two ktime_t variables to see if they are equal

 * @cmp1:	comparable1

 * @cmp2:	comparable2

 *

 * Compare two ktime_t variables.

 *

 * Return: 1 if equal.

 */

static inline int ktime_equal(const ktime_t cmp1, const ktime_t cmp2)

{

	return cmp1.tv64 == cmp2.tv64;

}

/**

 * ktime_compare - Compares two ktime_t variables for less, greater or equal

 * @cmp1:	comparable1

 * @cmp2:	comparable2

 *

 * Return: ...

 *   cmp1  < cmp2: return <0

 *   cmp1 == cmp2: return 0

 *   cmp1  > cmp2: return >0

 */

static inline int ktime_compare(const ktime_t cmp1, const ktime_t cmp2)

{

	if (cmp1.tv64 < cmp2.tv64)

		return -1;

	if (cmp1.tv64 > cmp2.tv64)

		return 1;

	return 0;

}

/**

 * ktime_after - Compare if a ktime_t value is bigger than another one.

 * @cmp1:	comparable1

 * @cmp2:	comparable2

 *

 * Return: true if cmp1 happened after cmp2.

 */

static inline bool ktime_after(const ktime_t cmp1, const ktime_t cmp2)

{

	return ktime_compare(cmp1, cmp2) > 0;

}

/**

 * ktime_before - Compare if a ktime_t value is smaller than another one.

 * @cmp1:	comparable1

 * @cmp2:	comparable2

 *

 * Return: true if cmp1 happened before cmp2.

 */

static inline bool ktime_before(const ktime_t cmp1, const ktime_t cmp2)

{

	return ktime_compare(cmp1, cmp2) < 0;

}

#if BITS_PER_LONG < 64

extern s64 __ktime_divns(const ktime_t kt, s64 div);

static inline s64 ktime_divns(const ktime_t kt, s64 div)

{

	/*

	 * Negative divisors could cause an inf loop,

	 * so bug out here.

	 */

	BUG_ON(div < 0);

	if (__builtin_constant_p(div) && !(div >> 32)) {

		s64 ns = kt.tv64;

		u64 tmp = ns < 0 ? -ns : ns;

		do_div(tmp, div);

		return ns < 0 ? -tmp : tmp;

	} else {

		return __ktime_divns(kt, div);

	}

}

#else /* BITS_PER_LONG < 64 */

static inline s64 ktime_divns(const ktime_t kt, s64 div)

{

	/*

	 * 32-bit implementation cannot handle negative divisors,

	 * so catch them on 64bit as well.

	 */

	WARN_ON(div < 0);

	return kt.tv64 / div;

}

#endif

static inline s64 ktime_to_us(const ktime_t kt)

{

	return ktime_divns(kt, NSEC_PER_USEC);

}

static inline s64 ktime_to_ms(const ktime_t kt)

{

	return ktime_divns(kt, NSEC_PER_MSEC);

}

static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier)

{

       return ktime_to_us(ktime_sub(later, earlier));

}

static inline s64 ktime_ms_delta(const ktime_t later, const ktime_t earlier)

{

	return ktime_to_ms(ktime_sub(later, earlier));

}

static inline ktime_t ktime_add_us(const ktime_t kt, const u64 usec)

{

	return ktime_add_ns(kt, usec * NSEC_PER_USEC);

}

static inline ktime_t ktime_add_ms(const ktime_t kt, const u64 msec)

{

	return ktime_add_ns(kt, msec * NSEC_PER_MSEC);

}

static inline ktime_t ktime_sub_us(const ktime_t kt, const u64 usec)

{

	return ktime_sub_ns(kt, usec * NSEC_PER_USEC);

}

extern ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs);

/**

 * ktime_to_timespec_cond - convert a ktime_t variable to timespec

 *			    format only if the variable contains data

 * @kt:		the ktime_t variable to convert

 * @ts:		the timespec variable to store the result in

 *

 * Return: %true if there was a successful conversion, %false if kt was 0.

 */

static inline __must_check bool ktime_to_timespec_cond(const ktime_t kt,

						       struct timespec *ts)

{

	if (kt.tv64) {

		*ts = ktime_to_timespec(kt);

		return true;

	} else {

		return false;

	}

}

/**

 * ktime_to_timespec64_cond - convert a ktime_t variable to timespec64

 *			    format only if the variable contains data

 * @kt:		the ktime_t variable to convert

 * @ts:		the timespec variable to store the result in

 *

 * Return: %true if there was a successful conversion, %false if kt was 0.

 */

static inline __must_check bool ktime_to_timespec64_cond(const ktime_t kt,

						       struct timespec64 *ts)

{

	if (kt.tv64) {

		*ts = ktime_to_timespec64(kt);

		return true;

	} else {

		return false;

	}

}

/*

 * The resolution of the clocks. The resolution value is returned in

 * the clock_getres() system call to give application programmers an

 * idea of the (in)accuracy of timers. Timer values are rounded up to

 * this resolution values.

 */

#define LOW_RES_NSEC		TICK_NSEC

#define KTIME_LOW_RES		(ktime_t){ .tv64 = LOW_RES_NSEC }

ktime_t ktime_get(void);

static inline ktime_t ns_to_ktime(u64 ns)

{

	static const ktime_t ktime_zero = { .tv64 = 0 };

	return ktime_add_ns(ktime_zero, ns);

}

static inline ktime_t ms_to_ktime(u64 ms)

{

	static const ktime_t ktime_zero = { .tv64 = 0 };

	return ktime_add_ms(ktime_zero, ms);

}

static inline u64 ktime_get_raw_ns(void)

{

    return ktime_get().tv64;

}

#endif