forked from Imagelibrary/rtems
223 lines
7.5 KiB
C
223 lines
7.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 2016 embedded brains GmbH & Co. KG
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*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)time.h 8.5 (Berkeley) 5/4/95
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* $FreeBSD$
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*/
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/**
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* @file
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*
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* @ingroup RTEMSImplFreeBSDKernel
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*
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* @brief This header file provides time definitions for the kernel space
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* (_KERNEL is defined before including <sys/time.h>).
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*/
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#if defined(_SYS_TIME_H_) && defined(_KERNEL)
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#include <machine/_timecounter.h>
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/* Operations on timespecs */
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#ifndef timespecclear
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#define timespecclear(tvp) ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
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#endif
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#ifndef timespecisset
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#define timespecisset(tvp) ((tvp)->tv_sec || (tvp)->tv_nsec)
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#endif
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#ifndef timespeccmp
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#define timespeccmp(tvp, uvp, cmp) \
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(((tvp)->tv_sec == (uvp)->tv_sec) ? \
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((tvp)->tv_nsec cmp (uvp)->tv_nsec) : \
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((tvp)->tv_sec cmp (uvp)->tv_sec))
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#endif
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#ifndef timespecadd
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#define timespecadd(tsp, usp, vsp) \
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do { \
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(vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec; \
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(vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec; \
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if ((vsp)->tv_nsec >= 1000000000L) { \
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(vsp)->tv_sec++; \
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(vsp)->tv_nsec -= 1000000000L; \
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} \
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} while (0)
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#endif
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#ifndef timespecsub
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#define timespecsub(tsp, usp, vsp) \
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do { \
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(vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec; \
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(vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec; \
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if ((vsp)->tv_nsec < 0) { \
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(vsp)->tv_sec--; \
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(vsp)->tv_nsec += 1000000000L; \
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} \
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} while (0)
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#endif
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/*
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* Simple macros to convert ticks to milliseconds
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* or microseconds and vice-versa. The answer
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* will always be at least 1. Note the return
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* value is a uint32_t however we step up the
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* operations to 64 bit to avoid any overflow/underflow
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* problems.
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*/
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#define TICKS_2_MSEC(t) max(1, (uint32_t)(hz == 1000) ? \
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(t) : (((uint64_t)(t) * (uint64_t)1000)/(uint64_t)hz))
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#define TICKS_2_USEC(t) max(1, (uint32_t)(hz == 1000) ? \
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((t) * 1000) : (((uint64_t)(t) * (uint64_t)1000000)/(uint64_t)hz))
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#define MSEC_2_TICKS(m) max(1, (uint32_t)((hz == 1000) ? \
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(m) : ((uint64_t)(m) * (uint64_t)hz)/(uint64_t)1000))
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#define USEC_2_TICKS(u) max(1, (uint32_t)((hz == 1000) ? \
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((u) / 1000) : ((uint64_t)(u) * (uint64_t)hz)/(uint64_t)1000000))
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/* Operations on timevals. */
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#define timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
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#define timevalisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
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#define timevalcmp(tvp, uvp, cmp) \
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(((tvp)->tv_sec == (uvp)->tv_sec) ? \
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((tvp)->tv_usec cmp (uvp)->tv_usec) : \
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((tvp)->tv_sec cmp (uvp)->tv_sec))
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/* timevaladd and timevalsub are not inlined */
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/*
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* Kernel to clock driver interface.
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*/
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void inittodr(time_t base);
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void resettodr(void);
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#define time_second _Timecounter_Time_second
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#define time_uptime _Timecounter_Time_uptime
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extern struct timeval boottime;
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extern struct bintime tc_tick_bt;
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extern sbintime_t tc_tick_sbt;
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extern struct bintime tick_bt;
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extern sbintime_t tick_sbt;
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extern int tc_precexp;
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extern int tc_timepercentage;
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extern struct bintime bt_timethreshold;
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extern struct bintime bt_tickthreshold;
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extern sbintime_t sbt_timethreshold;
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extern sbintime_t sbt_tickthreshold;
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/*
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* Functions for looking at our clock: [get]{bin,nano,micro}[up]time()
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*
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* Functions without the "get" prefix returns the best timestamp
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* we can produce in the given format.
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*
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* "bin" == struct bintime == seconds + 64 bit fraction of seconds.
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* "nano" == struct timespec == seconds + nanoseconds.
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* "micro" == struct timeval == seconds + microseconds.
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*
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* Functions containing "up" returns time relative to boot and
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* should be used for calculating time intervals.
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*
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* Functions without "up" returns UTC time.
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*
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* Functions with the "get" prefix returns a less precise result
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* much faster than the functions without "get" prefix and should
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* be used where a precision of 1/hz seconds is acceptable or where
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* performance is priority. (NB: "precision", _not_ "resolution" !)
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*/
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#define binuptime(_bt) _Timecounter_Binuptime(_bt)
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#define nanouptime(_tsp) _Timecounter_Nanouptime(_tsp)
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#define microuptime(_tvp) _Timecounter_Microuptime(_tvp)
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static __inline sbintime_t
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sbinuptime(void)
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{
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struct bintime _bt;
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binuptime(&_bt);
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return (bttosbt(_bt));
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}
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#define bintime(_bt) _Timecounter_Bintime(_bt)
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#define nanotime(_tsp) _Timecounter_Nanotime(_tsp)
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#define microtime(_tvp) _Timecounter_Microtime(_tvp)
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#define getbinuptime(_bt) _Timecounter_Getbinuptime(_bt)
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#define getnanouptime(_tsp) _Timecounter_Getnanouptime(_tsp)
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#define getmicrouptime(_tvp) _Timecounter_Getmicrouptime(_tvp)
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static __inline sbintime_t
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getsbinuptime(void)
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{
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struct bintime _bt;
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getbinuptime(&_bt);
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return (bttosbt(_bt));
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}
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#define getbintime(_bt) _Timecounter_Getbintime(_bt)
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#define getnanotime(_tsp) _Timecounter_Getnanotime(_tsp)
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#define getmicrotime(_tvp) _Timecounter_Getmicrotime(_tvp)
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#define getboottime(_tvp) _Timecounter_Getboottime(_tvp)
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#define getboottimebin(_bt) _Timecounter_Getboottimebin(_bt)
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/* Other functions */
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int itimerdecr(struct itimerval *itp, int usec);
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int itimerfix(struct timeval *tv);
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int ppsratecheck(struct timeval *, int *, int);
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int ratecheck(struct timeval *, const struct timeval *);
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void timevaladd(struct timeval *t1, const struct timeval *t2);
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void timevalsub(struct timeval *t1, const struct timeval *t2);
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int tvtohz(struct timeval *tv);
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#define TC_DEFAULTPERC 5
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#define BT2FREQ(bt) \
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(((uint64_t)0x8000000000000000 + ((bt)->frac >> 2)) / \
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((bt)->frac >> 1))
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#define SBT2FREQ(sbt) ((SBT_1S + ((sbt) >> 1)) / (sbt))
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#define FREQ2BT(freq, bt) \
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{ \
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(bt)->sec = 0; \
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(bt)->frac = ((uint64_t)0x8000000000000000 / (freq)) << 1; \
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}
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#define TIMESEL(sbt, sbt2) \
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(((sbt2) >= sbt_timethreshold) ? \
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((*(sbt) = getsbinuptime()), 1) : ((*(sbt) = sbinuptime()), 0))
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#else /* !_SYS_TIME_H_ || !_KERNEL */
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#error "must be included via <sys/time.h> in kernel space"
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#endif /* _SYS_TIME_H_ && _KERNEL */
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