2 * Copyright (c) 2004, Matthew Dillon <dillon@backplane.com>
3 * Copyright (c) 1997, 1998 Poul-Henning Kamp <phk@FreeBSD.org>
4 * Copyright (c) 1982, 1986, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
41 * $FreeBSD: src/sys/kern/kern_clock.c,v 1.105.2.10 2002/10/17 13:19:40 maxim Exp $
42 * $DragonFly: src/sys/kern/kern_clock.c,v 1.17 2004/03/20 19:21:08 dillon Exp $
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/dkstat.h>
50 #include <sys/callout.h>
51 #include <sys/kernel.h>
53 #include <sys/malloc.h>
54 #include <sys/resourcevar.h>
55 #include <sys/signalvar.h>
56 #include <sys/timex.h>
57 #include <sys/timepps.h>
61 #include <vm/vm_map.h>
62 #include <sys/sysctl.h>
63 #include <sys/thread2.h>
65 #include <machine/cpu.h>
66 #include <machine/limits.h>
67 #include <machine/smp.h>
74 extern void init_device_poll(void);
75 extern void hardclock_device_poll(void);
76 #endif /* DEVICE_POLLING */
78 static void initclocks (void *dummy);
79 SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL)
82 * Some of these don't belong here, but it's easiest to concentrate them.
83 * Note that cp_time[] counts in microseconds, but most userland programs
84 * just compare relative times against the total by delta.
86 long cp_time[CPUSTATES];
88 SYSCTL_OPAQUE(_kern, OID_AUTO, cp_time, CTLFLAG_RD, &cp_time, sizeof(cp_time),
89 "LU", "CPU time statistics");
97 * boottime is used to calculate the 'real' uptime. Do not confuse this with
98 * microuptime(). microtime() is not drift compensated. The real uptime
99 * with compensation is nanotime() - bootime.
101 * basetime is used to calculate the compensated real time of day. Chunky
102 * changes to the time, aka settimeofday(), are made by modifying basetime.
104 * The gd_time_seconds and gd_cpuclock_base fields remain fairly monotonic.
105 * Slight adjustments to gd_cpuclock_base are made to phase-lock it to
108 struct timespec boottime; /* boot time (realtime) for reference only */
109 struct timespec basetime; /* base time adjusts uptime -> realtime */
110 time_t time_second; /* read-only 'passive' uptime in seconds */
112 SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD,
113 &boottime, timeval, "System boottime");
114 SYSCTL_STRUCT(_kern, OID_AUTO, basetime, CTLFLAG_RD,
115 &basetime, timeval, "System basetime");
117 static void hardclock(systimer_t info, struct intrframe *frame);
118 static void statclock(systimer_t info, struct intrframe *frame);
119 static void schedclock(systimer_t info, struct intrframe *frame);
121 int ticks; /* system master ticks at hz */
122 int64_t nsec_adj; /* ntpd per-tick adjustment in nsec << 32 */
123 int64_t nsec_acc; /* accumulator */
126 * Finish initializing clock frequencies and start all clocks running.
130 initclocks(void *dummy)
133 #ifdef DEVICE_POLLING
136 /*psratio = profhz / stathz;*/
141 * Called on a per-cpu basis
144 initclocks_pcpu(void)
146 struct globaldata *gd = mycpu;
149 if (gd->gd_cpuid == 0) {
150 gd->gd_time_seconds = 1;
151 gd->gd_cpuclock_base = cputimer_count();
154 gd->gd_time_seconds = globaldata_find(0)->gd_time_seconds;
155 gd->gd_cpuclock_base = globaldata_find(0)->gd_cpuclock_base;
157 systimer_init_periodic(&gd->gd_hardclock, hardclock, NULL, hz);
158 systimer_init_periodic(&gd->gd_statclock, statclock, NULL, stathz);
159 /* XXX correct the frequency for scheduler / estcpu tests */
160 systimer_init_periodic(&gd->gd_schedclock, schedclock,
166 * This sets the current real time of day. Timespecs are in seconds and
167 * nanoseconds. We do not mess with gd_time_seconds and gd_cpuclock_base,
168 * instead we adjust basetime so basetime + gd_* results in the current
169 * time of day. This way the gd_* fields are guarenteed to represent
170 * a monotonically increasing 'uptime' value.
173 set_timeofday(struct timespec *ts)
178 * XXX SMP / non-atomic basetime updates
182 basetime.tv_sec = ts->tv_sec - ts2.tv_sec;
183 basetime.tv_nsec = ts->tv_nsec - ts2.tv_nsec;
184 if (basetime.tv_nsec < 0) {
185 basetime.tv_nsec += 1000000000;
188 if (boottime.tv_sec == 0)
195 * Each cpu has its own hardclock, but we only increments ticks and softticks
198 * NOTE! systimer! the MP lock might not be held here. We can only safely
199 * manipulate objects owned by the current cpu.
202 hardclock(systimer_t info, struct intrframe *frame)
206 struct pstats *pstats;
207 struct globaldata *gd = mycpu;
210 * Realtime updates are per-cpu. Note that timer corrections as
211 * returned by microtime() and friends make an additional adjustment
212 * using a system-wise 'basetime', but the running time is always
213 * taken from the per-cpu globaldata area. Since the same clock
214 * is distributing (XXX SMP) to all cpus, the per-cpu timebases
217 * Note that we never allow info->time (aka gd->gd_hardclock.time)
218 * to reverse index gd_cpuclock_base.
220 cputicks = info->time - gd->gd_cpuclock_base;
221 if (cputicks > cputimer_freq) {
222 ++gd->gd_time_seconds;
223 gd->gd_cpuclock_base += cputimer_freq;
227 * The system-wide ticks and softticks are only updated by cpu #0.
228 * Callwheel actions are also (at the moment) only handled by cpu #0.
229 * Finally, we also do NTP related timedelta/tickdelta adjustments
230 * by adjusting basetime.
232 if (gd->gd_cpuid == 0) {
238 #ifdef DEVICE_POLLING
239 hardclock_device_poll(); /* mpsafe, short and quick */
240 #endif /* DEVICE_POLLING */
242 if (TAILQ_FIRST(&callwheel[ticks & callwheelmask]) != NULL) {
244 } else if (softticks + 1 == ticks) {
249 if (tco->tc_poll_pps)
250 tco->tc_poll_pps(tco);
253 * Apply adjtime corrections. At the moment only do this if
254 * we can get the MP lock to interlock with adjtime's modification
255 * of these variables. Note that basetime adjustments are not
256 * MP safe either XXX.
258 if (timedelta != 0 && try_mplock()) {
259 basetime.tv_nsec += tickdelta * 1000;
260 if (basetime.tv_nsec >= 1000000000) {
261 basetime.tv_nsec -= 1000000000;
263 } else if (basetime.tv_nsec < 0) {
264 basetime.tv_nsec += 1000000000;
267 timedelta -= tickdelta;
272 * Apply per-tick compensation. ticks_adj adjusts for both
273 * offset and frequency, and could be negative.
275 if (nsec_adj != 0 && try_mplock()) {
276 nsec_acc += nsec_adj;
277 if (nsec_acc >= 0x100000000LL) {
278 basetime.tv_nsec += nsec_acc >> 32;
279 nsec_acc = (nsec_acc & 0xFFFFFFFFLL);
280 } else if (nsec_acc <= -0x100000000LL) {
281 basetime.tv_nsec -= -nsec_acc >> 32;
282 nsec_acc = -(-nsec_acc & 0xFFFFFFFFLL);
284 if (basetime.tv_nsec >= 1000000000) {
285 basetime.tv_nsec -= 1000000000;
287 } else if (basetime.tv_nsec < 0) {
288 basetime.tv_nsec += 1000000000;
295 * If the realtime-adjusted seconds hand rolls over then tell
296 * ntp_update_second() what we did in the last second so it can
297 * calculate what to do in the next second. It may also add
298 * or subtract a leap second.
301 if (time_second != nts.tv_sec) {
302 leap = ntp_update_second(time_second, &nsec_adj);
303 basetime.tv_sec += leap;
304 time_second = nts.tv_sec + leap;
310 * ITimer handling is per-tick, per-cpu. I don't think psignal()
311 * is mpsafe on curproc, so XXX get the mplock.
313 if ((p = curproc) != NULL && try_mplock()) {
315 if (frame && CLKF_USERMODE(frame) &&
316 timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) &&
317 itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0)
318 psignal(p, SIGVTALRM);
319 if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value) &&
320 itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0)
328 * The statistics clock typically runs at a 125Hz rate, and is intended
329 * to be frequency offset from the hardclock (typ 100Hz). It is per-cpu.
331 * NOTE! systimer! the MP lock might not be held here. We can only safely
332 * manipulate objects owned by the current cpu.
334 * The stats clock is responsible for grabbing a profiling sample.
335 * Most of the statistics are only used by user-level statistics programs.
336 * The main exceptions are p->p_uticks, p->p_sticks, p->p_iticks, and
339 * Like the other clocks, the stat clock is called from what is effectively
340 * a fast interrupt, so the context should be the thread/process that got
344 statclock(systimer_t info, struct intrframe *frame)
357 * How big was our timeslice relative to the last time?
359 microuptime(&tv); /* mpsafe */
360 stv = &mycpu->gd_stattv;
361 if (stv->tv_sec == 0) {
364 bump = tv.tv_usec - stv->tv_usec +
365 (tv.tv_sec - stv->tv_sec) * 1000000;
376 if (frame && CLKF_USERMODE(frame)) {
378 * Came from userland, handle user time and deal with
381 if (p && (p->p_flag & P_PROFIL))
382 addupc_intr(p, CLKF_PC(frame), 1);
383 td->td_uticks += bump;
386 * Charge the time as appropriate
388 if (p && p->p_nice > NZERO)
389 cp_time[CP_NICE] += bump;
391 cp_time[CP_USER] += bump;
395 * Kernel statistics are just like addupc_intr, only easier.
398 if (g->state == GMON_PROF_ON && frame) {
399 i = CLKF_PC(frame) - g->lowpc;
400 if (i < g->textsize) {
401 i /= HISTFRACTION * sizeof(*g->kcount);
407 * Came from kernel mode, so we were:
408 * - handling an interrupt,
409 * - doing syscall or trap work on behalf of the current
411 * - spinning in the idle loop.
412 * Whichever it is, charge the time as appropriate.
413 * Note that we charge interrupts to the current process,
414 * regardless of whether they are ``for'' that process,
415 * so that we know how much of its real time was spent
416 * in ``non-process'' (i.e., interrupt) work.
418 * XXX assume system if frame is NULL. A NULL frame
419 * can occur if ipi processing is done from an splx().
421 if (frame && CLKF_INTR(frame))
422 td->td_iticks += bump;
424 td->td_sticks += bump;
426 if (frame && CLKF_INTR(frame)) {
427 cp_time[CP_INTR] += bump;
429 if (td == &mycpu->gd_idlethread)
430 cp_time[CP_IDLE] += bump;
432 cp_time[CP_SYS] += bump;
438 * The scheduler clock typically runs at a 10Hz rate. NOTE! systimer,
439 * the MP lock might not be held. We can safely manipulate parts of curproc
440 * but that's about it.
443 schedclock(systimer_t info, struct intrframe *frame)
446 struct pstats *pstats;
451 schedulerclock(NULL); /* mpsafe */
452 if ((p = curproc) != NULL) {
453 /* Update resource usage integrals and maximums. */
454 if ((pstats = p->p_stats) != NULL &&
455 (ru = &pstats->p_ru) != NULL &&
456 (vm = p->p_vmspace) != NULL) {
457 ru->ru_ixrss += pgtok(vm->vm_tsize);
458 ru->ru_idrss += pgtok(vm->vm_dsize);
459 ru->ru_isrss += pgtok(vm->vm_ssize);
460 rss = pgtok(vmspace_resident_count(vm));
461 if (ru->ru_maxrss < rss)
468 * Compute number of ticks for the specified amount of time. The
469 * return value is intended to be used in a clock interrupt timed
470 * operation and guarenteed to meet or exceed the requested time.
471 * If the representation overflows, return INT_MAX. The minimum return
472 * value is 1 ticks and the function will average the calculation up.
473 * If any value greater then 0 microseconds is supplied, a value
474 * of at least 2 will be returned to ensure that a near-term clock
475 * interrupt does not cause the timeout to occur (degenerately) early.
477 * Note that limit checks must take into account microseconds, which is
478 * done simply by using the smaller signed long maximum instead of
479 * the unsigned long maximum.
481 * If ints have 32 bits, then the maximum value for any timeout in
482 * 10ms ticks is 248 days.
485 tvtohz_high(struct timeval *tv)
502 printf("tvotohz: negative time difference %ld sec %ld usec\n",
506 } else if (sec <= INT_MAX / hz) {
507 ticks = (int)(sec * hz +
508 ((u_long)usec + (tick - 1)) / tick) + 1;
516 * Compute number of ticks for the specified amount of time, erroring on
517 * the side of it being too low to ensure that sleeping the returned number
518 * of ticks will not result in a late return.
520 * The supplied timeval may not be negative and should be normalized. A
521 * return value of 0 is possible if the timeval converts to less then
524 * If ints have 32 bits, then the maximum value for any timeout in
525 * 10ms ticks is 248 days.
528 tvtohz_low(struct timeval *tv)
534 if (sec <= INT_MAX / hz)
535 ticks = (int)(sec * hz + (u_long)tv->tv_usec / tick);
543 * Start profiling on a process.
545 * Kernel profiling passes proc0 which never exits and hence
546 * keeps the profile clock running constantly.
549 startprofclock(struct proc *p)
551 if ((p->p_flag & P_PROFIL) == 0) {
552 p->p_flag |= P_PROFIL;
554 if (++profprocs == 1 && stathz != 0) {
557 setstatclockrate(profhz);
565 * Stop profiling on a process.
568 stopprofclock(struct proc *p)
570 if (p->p_flag & P_PROFIL) {
571 p->p_flag &= ~P_PROFIL;
573 if (--profprocs == 0 && stathz != 0) {
576 setstatclockrate(stathz);
584 * Return information about system clocks.
587 sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
589 struct clockinfo clkinfo;
591 * Construct clockinfo structure.
595 clkinfo.tickadj = tickadj;
596 clkinfo.profhz = profhz;
597 clkinfo.stathz = stathz ? stathz : hz;
598 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req));
601 SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
602 0, 0, sysctl_kern_clockrate, "S,clockinfo","");
605 * We have eight functions for looking at the clock, four for
606 * microseconds and four for nanoseconds. For each there is fast
607 * but less precise version "get{nano|micro}[up]time" which will
608 * return a time which is up to 1/HZ previous to the call, whereas
609 * the raw version "{nano|micro}[up]time" will return a timestamp
610 * which is as precise as possible. The "up" variants return the
611 * time relative to system boot, these are well suited for time
612 * interval measurements.
614 * Each cpu independantly maintains the current time of day, so all
615 * we need to do to protect ourselves from changes is to do a loop
616 * check on the seconds field changing out from under us.
619 getmicrouptime(struct timeval *tvp)
621 struct globaldata *gd = mycpu;
625 tvp->tv_sec = gd->gd_time_seconds;
626 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
627 } while (tvp->tv_sec != gd->gd_time_seconds);
628 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32;
629 if (tvp->tv_usec >= 1000000) {
630 tvp->tv_usec -= 1000000;
636 getnanouptime(struct timespec *tsp)
638 struct globaldata *gd = mycpu;
642 tsp->tv_sec = gd->gd_time_seconds;
643 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
644 } while (tsp->tv_sec != gd->gd_time_seconds);
645 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
646 if (tsp->tv_nsec >= 1000000000) {
647 tsp->tv_nsec -= 1000000000;
653 microuptime(struct timeval *tvp)
655 struct globaldata *gd = mycpu;
659 tvp->tv_sec = gd->gd_time_seconds;
660 delta = cputimer_count() - gd->gd_cpuclock_base;
661 } while (tvp->tv_sec != gd->gd_time_seconds);
662 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32;
663 if (tvp->tv_usec >= 1000000) {
664 tvp->tv_usec -= 1000000;
670 nanouptime(struct timespec *tsp)
672 struct globaldata *gd = mycpu;
676 tsp->tv_sec = gd->gd_time_seconds;
677 delta = cputimer_count() - gd->gd_cpuclock_base;
678 } while (tsp->tv_sec != gd->gd_time_seconds);
679 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
680 if (tsp->tv_nsec >= 1000000000) {
681 tsp->tv_nsec -= 1000000000;
691 getmicrotime(struct timeval *tvp)
693 struct globaldata *gd = mycpu;
697 tvp->tv_sec = gd->gd_time_seconds;
698 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
699 } while (tvp->tv_sec != gd->gd_time_seconds);
700 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32;
702 tvp->tv_sec += basetime.tv_sec;
703 tvp->tv_usec += basetime.tv_nsec / 1000;
704 while (tvp->tv_usec >= 1000000) {
705 tvp->tv_usec -= 1000000;
711 getnanotime(struct timespec *tsp)
713 struct globaldata *gd = mycpu;
717 tsp->tv_sec = gd->gd_time_seconds;
718 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
719 } while (tsp->tv_sec != gd->gd_time_seconds);
720 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
722 tsp->tv_sec += basetime.tv_sec;
723 tsp->tv_nsec += basetime.tv_nsec;
724 while (tsp->tv_nsec >= 1000000000) {
725 tsp->tv_nsec -= 1000000000;
731 microtime(struct timeval *tvp)
733 struct globaldata *gd = mycpu;
737 tvp->tv_sec = gd->gd_time_seconds;
738 delta = cputimer_count() - gd->gd_cpuclock_base;
739 } while (tvp->tv_sec != gd->gd_time_seconds);
740 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32;
742 tvp->tv_sec += basetime.tv_sec;
743 tvp->tv_usec += basetime.tv_nsec / 1000;
744 while (tvp->tv_usec >= 1000000) {
745 tvp->tv_usec -= 1000000;
751 nanotime(struct timespec *tsp)
753 struct globaldata *gd = mycpu;
757 tsp->tv_sec = gd->gd_time_seconds;
758 delta = cputimer_count() - gd->gd_cpuclock_base;
759 } while (tsp->tv_sec != gd->gd_time_seconds);
760 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
762 tsp->tv_sec += basetime.tv_sec;
763 tsp->tv_nsec += basetime.tv_nsec;
764 while (tsp->tv_nsec >= 1000000000) {
765 tsp->tv_nsec -= 1000000000;
771 pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps)
774 struct pps_fetch_args *fapi;
776 struct pps_kcbind_args *kapi;
782 case PPS_IOC_DESTROY:
784 case PPS_IOC_SETPARAMS:
785 app = (pps_params_t *)data;
786 if (app->mode & ~pps->ppscap)
788 pps->ppsparam = *app;
790 case PPS_IOC_GETPARAMS:
791 app = (pps_params_t *)data;
792 *app = pps->ppsparam;
793 app->api_version = PPS_API_VERS_1;
796 *(int*)data = pps->ppscap;
799 fapi = (struct pps_fetch_args *)data;
800 if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC)
802 if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec)
804 pps->ppsinfo.current_mode = pps->ppsparam.mode;
805 fapi->pps_info_buf = pps->ppsinfo;
809 kapi = (struct pps_kcbind_args *)data;
810 /* XXX Only root should be able to do this */
811 if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC)
813 if (kapi->kernel_consumer != PPS_KC_HARDPPS)
815 if (kapi->edge & ~pps->ppscap)
817 pps->kcmode = kapi->edge;
828 pps_init(struct pps_state *pps)
830 pps->ppscap |= PPS_TSFMT_TSPEC;
831 if (pps->ppscap & PPS_CAPTUREASSERT)
832 pps->ppscap |= PPS_OFFSETASSERT;
833 if (pps->ppscap & PPS_CAPTURECLEAR)
834 pps->ppscap |= PPS_OFFSETCLEAR;
838 pps_event(struct pps_state *pps, sysclock_t count, int event)
840 struct globaldata *gd;
841 struct timespec *tsp;
842 struct timespec *osp;
855 /* Things would be easier with arrays... */
856 if (event == PPS_CAPTUREASSERT) {
857 tsp = &pps->ppsinfo.assert_timestamp;
858 osp = &pps->ppsparam.assert_offset;
859 foff = pps->ppsparam.mode & PPS_OFFSETASSERT;
860 fhard = pps->kcmode & PPS_CAPTUREASSERT;
861 pcount = &pps->ppscount[0];
862 pseq = &pps->ppsinfo.assert_sequence;
864 tsp = &pps->ppsinfo.clear_timestamp;
865 osp = &pps->ppsparam.clear_offset;
866 foff = pps->ppsparam.mode & PPS_OFFSETCLEAR;
867 fhard = pps->kcmode & PPS_CAPTURECLEAR;
868 pcount = &pps->ppscount[1];
869 pseq = &pps->ppsinfo.clear_sequence;
872 /* Nothing really happened */
873 if (*pcount == count)
879 ts.tv_sec = gd->gd_time_seconds;
880 delta = count - gd->gd_cpuclock_base;
881 } while (ts.tv_sec != gd->gd_time_seconds);
882 if (delta > cputimer_freq) {
883 ts.tv_sec += delta / cputimer_freq;
884 delta %= cputimer_freq;
886 ts.tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
887 ts.tv_sec += basetime.tv_sec;
888 ts.tv_nsec += basetime.tv_nsec;
889 while (ts.tv_nsec >= 1000000000) {
890 ts.tv_nsec -= 1000000000;
898 timespecadd(tsp, osp);
899 if (tsp->tv_nsec < 0) {
900 tsp->tv_nsec += 1000000000;
906 /* magic, at its best... */
907 tcount = count - pps->ppscount[2];
908 pps->ppscount[2] = count;
909 delta = (cputimer_freq64_nsec * tcount) >> 32;