source: rtems/cpukit/libcsupport/include/machine/_kernel_time.h @ 6de41c5f

/*-
 * Copyright (c) 2016 embedded brains GmbH
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if !defined(_SYS_TIME_H_) || !defined(_KERNEL)
#error "must be included via <sys/time.h> in kernel space"
#endif

/* Operations on timespecs */
#define timespecclear(tvp)      ((tvp)->tv_sec = (tvp)->tv_nsec = 0)
#define timespecisset(tvp)      ((tvp)->tv_sec || (tvp)->tv_nsec)
#define timespeccmp(tvp, uvp, cmp)                                      \
        (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
            ((tvp)->tv_nsec cmp (uvp)->tv_nsec) :                       \
            ((tvp)->tv_sec cmp (uvp)->tv_sec))
#define timespecadd(vvp, uvp)                                           \
        do {                                                            \
                (vvp)->tv_sec += (uvp)->tv_sec;                         \
                (vvp)->tv_nsec += (uvp)->tv_nsec;                       \
                if ((vvp)->tv_nsec >= 1000000000) {                     \
                        (vvp)->tv_sec++;                                \
                        (vvp)->tv_nsec -= 1000000000;                   \
                }                                                       \
        } while (0)
#define timespecsub(vvp, uvp)                                           \
        do {                                                            \
                (vvp)->tv_sec -= (uvp)->tv_sec;                         \
                (vvp)->tv_nsec -= (uvp)->tv_nsec;                       \
                if ((vvp)->tv_nsec < 0) {                               \
                        (vvp)->tv_sec--;                                \
                        (vvp)->tv_nsec += 1000000000;                   \
                }                                                       \
        } while (0)

/* Operations on timevals. */

#define timevalclear(tvp)               ((tvp)->tv_sec = (tvp)->tv_usec = 0)
#define timevalisset(tvp)               ((tvp)->tv_sec || (tvp)->tv_usec)
#define timevalcmp(tvp, uvp, cmp)                                       \
        (((tvp)->tv_sec == (uvp)->tv_sec) ?                             \
            ((tvp)->tv_usec cmp (uvp)->tv_usec) :                       \
            ((tvp)->tv_sec cmp (uvp)->tv_sec))

/* timevaladd and timevalsub are not inlined */

/*
 * Kernel to clock driver interface.
 */
void    inittodr(time_t base);
void    resettodr(void);

#define time_second _Timecounter_Time_second
#define time_uptime _Timecounter_Time_uptime
#define boottimebin _Timecounter_Boottimebin
extern struct timeval boottime;
extern struct bintime tc_tick_bt;
extern sbintime_t tc_tick_sbt;
extern struct bintime tick_bt;
extern sbintime_t tick_sbt;
extern int tc_precexp;
extern int tc_timepercentage;
extern struct bintime bt_timethreshold;
extern struct bintime bt_tickthreshold;
extern sbintime_t sbt_timethreshold;
extern sbintime_t sbt_tickthreshold;

/*
 * Functions for looking at our clock: [get]{bin,nano,micro}[up]time()
 *
 * Functions without the "get" prefix returns the best timestamp
 * we can produce in the given format.
 *
 * "bin"   == struct bintime  == seconds + 64 bit fraction of seconds.
 * "nano"  == struct timespec == seconds + nanoseconds.
 * "micro" == struct timeval  == seconds + microseconds.
 *
 * Functions containing "up" returns time relative to boot and
 * should be used for calculating time intervals.
 *
 * Functions without "up" returns UTC time.
 *
 * Functions with the "get" prefix returns a less precise result
 * much faster than the functions without "get" prefix and should
 * be used where a precision of 1/hz seconds is acceptable or where
 * performance is priority. (NB: "precision", _not_ "resolution" !)
 */

#define binuptime(_bt) _Timecounter_Binuptime(_bt)
#define nanouptime(_tsp) _Timecounter_Nanouptime(_tsp)
#define microuptime(_tvp) _Timecounter_Microuptime(_tvp)

static __inline sbintime_t
sbinuptime(void)
{
        struct bintime _bt;

        binuptime(&_bt);
        return (bttosbt(_bt));
}

#define bintime(_bt) _Timecounter_Bintime(_bt)
#define nanotime(_tsp) _Timecounter_Nanotime(_tsp)
#define microtime(_tvp) _Timecounter_Microtime(_tvp)

#define getbinuptime(_bt) _Timecounter_Getbinuptime(_bt)
#define getnanouptime(_tsp) _Timecounter_Getnanouptime(_tsp)
#define getmicrouptime(_tvp) _Timecounter_Getmicrouptime(_tvp)

static __inline sbintime_t
getsbinuptime(void)
{
        struct bintime _bt;

        getbinuptime(&_bt);
        return (bttosbt(_bt));
}

#define getbintime(_bt) _Timecounter_Getbintime(_bt)
#define getnanotime(_tsp) _Timecounter_Getnanotime(_tsp)
#define getmicrotime(_tvp) _Timecounter_Getmicrotime(_tvp)

/* Other functions */
int     itimerdecr(struct itimerval *itp, int usec);
int     itimerfix(struct timeval *tv);
int     ppsratecheck(struct timeval *, int *, int);
int     ratecheck(struct timeval *, const struct timeval *);
void    timevaladd(struct timeval *t1, const struct timeval *t2);
void    timevalsub(struct timeval *t1, const struct timeval *t2);
int     tvtohz(struct timeval *tv);

#define TC_DEFAULTPERC          5

#define BT2FREQ(bt)                                                     \
        (((uint64_t)0x8000000000000000 + ((bt)->frac >> 2)) /           \
            ((bt)->frac >> 1))

#define SBT2FREQ(sbt)   ((SBT_1S + ((sbt) >> 1)) / (sbt))

#define FREQ2BT(freq, bt)                                               \
{                                                                       \
        (bt)->sec = 0;                                                  \
        (bt)->frac = ((uint64_t)0x8000000000000000  / (freq)) << 1;     \
}

#define TIMESEL(sbt, sbt2)                                              \
        (((sbt2) >= sbt_timethreshold) ?                                \
            ((*(sbt) = getsbinuptime()), 1) : ((*(sbt) = sbinuptime()), 0))