2 * Copyright (c) 1997, 1998 Poul-Henning Kamp <phk@FreeBSD.org>
3 * Copyright (c) 1982, 1986, 1991, 1993
4 * The Regents of the University of California. All rights reserved.
5 * (c) UNIX System Laboratories, Inc.
6 * All or some portions of this file are derived from material licensed
7 * to the University of California by American Telephone and Telegraph
8 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
9 * the permission of UNIX System Laboratories, Inc.
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15 * notice, this list of conditions and the following disclaimer.
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21 * This product includes software developed by the University of
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23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
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39 * @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
40 * $FreeBSD: src/sys/kern/kern_clock.c,v 1.105.2.10 2002/10/17 13:19:40 maxim Exp $
41 * $DragonFly: src/sys/kern/kern_clock.c,v 1.13 2004/01/07 11:04:18 dillon Exp $
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/dkstat.h>
49 #include <sys/callout.h>
50 #include <sys/kernel.h>
52 #include <sys/malloc.h>
53 #include <sys/resourcevar.h>
54 #include <sys/signalvar.h>
55 #include <sys/timex.h>
56 #include <sys/timepps.h>
60 #include <vm/vm_map.h>
61 #include <sys/sysctl.h>
63 #include <machine/cpu.h>
64 #include <machine/limits.h>
65 #include <machine/smp.h>
72 extern void init_device_poll(void);
73 extern void hardclock_device_poll(void);
74 #endif /* DEVICE_POLLING */
77 * Number of timecounters used to implement stable storage
80 #define NTIMECOUNTER 5
83 static MALLOC_DEFINE(M_TIMECOUNTER, "timecounter",
84 "Timecounter stable storage");
86 static void initclocks (void *dummy);
87 SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL)
89 static void tco_forward (int force);
90 static void tco_setscales (struct timecounter *tc);
91 static __inline unsigned tco_delta (struct timecounter *tc);
94 * Some of these don't belong here, but it's easiest to concentrate them.
95 * Note that cp_time[] counts in microseconds, but most userland programs
96 * just compare relative times against the total by delta.
98 long cp_time[CPUSTATES];
100 SYSCTL_OPAQUE(_kern, OID_AUTO, cp_time, CTLFLAG_RD, &cp_time, sizeof(cp_time),
101 "LU", "CPU time statistics");
110 struct timeval boottime;
111 SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD,
112 &boottime, timeval, "System boottime");
115 * Which update policy to use.
116 * 0 - every tick, bad hardware may fail with "calcru negative..."
117 * 1 - more resistent to the above hardware, but less efficient.
119 static int tco_method;
122 * Implement a dummy timecounter which we can use until we get a real one
123 * in the air. This allows the console and other early stuff to use
128 dummy_get_timecount(struct timecounter *tc)
134 static struct timecounter dummy_timecounter = {
142 struct timecounter *timecounter = &dummy_timecounter;
145 * Clock handling routines.
147 * This code is written to operate with two timers that run independently of
150 * The main timer, running hz times per second, is used to trigger interval
151 * timers, timeouts and rescheduling as needed.
153 * The second timer handles kernel and user profiling,
154 * and does resource use estimation. If the second timer is programmable,
155 * it is randomized to avoid aliasing between the two clocks. For example,
156 * the randomization prevents an adversary from always giving up the cpu
157 * just before its quantum expires. Otherwise, it would never accumulate
158 * cpu ticks. The mean frequency of the second timer is stathz.
160 * If no second timer exists, stathz will be zero; in this case we drive
161 * profiling and statistics off the main clock. This WILL NOT be accurate;
162 * do not do it unless absolutely necessary.
164 * The statistics clock may (or may not) be run at a higher rate while
165 * profiling. This profile clock runs at profhz. We require that profhz
166 * be an integral multiple of stathz.
168 * If the statistics clock is running fast, it must be divided by the ratio
169 * profhz/stathz for statistics. (For profiling, every tick counts.)
171 * Time-of-day is maintained using a "timecounter", which may or may
172 * not be related to the hardware generating the above mentioned
178 static int profprocs;
180 static int psticks; /* profiler ticks */
181 static int psdiv; /* prof / stat divider */
182 int psratio; /* ratio: prof * 100 / stat */
185 * Initialize clock frequencies and start both clocks running.
195 * Set divisors to 1 (normal case) and let the machine-specific
201 #ifdef DEVICE_POLLING
206 * Compute profhz/stathz, and fix profhz if needed.
208 i = stathz ? stathz : hz;
211 psratio = profhz / i;
215 * The real-time timer, interrupting hz times per second. This is implemented
216 * as a FAST interrupt so it is in the context of the thread it interrupted,
217 * and not in an interrupt thread. YYY needs help.
221 struct clockframe *frame;
227 struct pstats *pstats;
230 * Run current process's virtual and profile time, as needed.
233 if (CLKF_USERMODE(frame) &&
234 timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) &&
235 itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0)
236 psignal(p, SIGVTALRM);
237 if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value) &&
238 itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0)
242 #if 0 /* SMP and BETTER_CLOCK */
243 forward_hardclock(pscnt);
247 * If no separate statistics clock is available, run it from here.
255 #ifdef DEVICE_POLLING
256 hardclock_device_poll(); /* this is very short and quick */
257 #endif /* DEVICE_POLLING */
260 * Process callouts at a very low cpu priority, so we don't keep the
261 * relatively high clock interrupt priority any longer than necessary.
263 if (TAILQ_FIRST(&callwheel[ticks & callwheelmask]) != NULL) {
265 } else if (softticks + 1 == ticks) {
271 * Compute number of ticks for the specified amount of time. The
272 * return value is intended to be used in a clock interrupt timed
273 * operation and guarenteed to meet or exceed the requested time.
274 * If the representation overflows, return INT_MAX. The minimum return
275 * value is 1 ticks and the function will average the calculation up.
276 * If any value greater then 0 microseconds is supplied, a value
277 * of at least 2 will be returned to ensure that a near-term clock
278 * interrupt does not cause the timeout to occur (degenerately) early.
280 * Note that limit checks must take into account microseconds, which is
281 * done simply by using the smaller signed long maximum instead of
282 * the unsigned long maximum.
284 * If ints have 32 bits, then the maximum value for any timeout in
285 * 10ms ticks is 248 days.
288 tvtohz_high(struct timeval *tv)
305 printf("tvotohz: negative time difference %ld sec %ld usec\n",
309 } else if (sec <= INT_MAX / hz) {
310 ticks = (int)(sec * hz +
311 ((u_long)usec + (tick - 1)) / tick) + 1;
319 * Compute number of ticks for the specified amount of time, erroring on
320 * the side of it being too low to ensure that sleeping the returned number
321 * of ticks will not result in a late return.
323 * The supplied timeval may not be negative and should be normalized. A
324 * return value of 0 is possible if the timeval converts to less then
327 * If ints have 32 bits, then the maximum value for any timeout in
328 * 10ms ticks is 248 days.
331 tvtohz_low(struct timeval *tv)
337 if (sec <= INT_MAX / hz)
338 ticks = (int)(sec * hz + (u_long)tv->tv_usec / tick);
346 * Start profiling on a process.
348 * Kernel profiling passes proc0 which never exits and hence
349 * keeps the profile clock running constantly.
357 if ((p->p_flag & P_PROFIL) == 0) {
358 p->p_flag |= P_PROFIL;
359 if (++profprocs == 1 && stathz != 0) {
362 setstatclockrate(profhz);
369 * Stop profiling on a process.
377 if (p->p_flag & P_PROFIL) {
378 p->p_flag &= ~P_PROFIL;
379 if (--profprocs == 0 && stathz != 0) {
382 setstatclockrate(stathz);
389 * Statistics clock. Grab profile sample, and if divider reaches 0,
390 * do process and kernel statistics. Most of the statistics are only
391 * used by user-level statistics programs. The main exceptions are
392 * p->p_uticks, p->p_sticks, p->p_iticks, and p->p_estcpu.
394 * The statclock should be called from an exclusive, fast interrupt,
395 * so the context should be the thread/process that got interrupted and
396 * not an interrupt thread.
400 struct clockframe *frame;
407 struct pstats *pstats;
417 * How big was our timeslice relative to the last time
420 stv = &mycpu->gd_stattv;
421 if (stv->tv_sec == 0) {
424 bump = tv.tv_usec - stv->tv_usec +
425 (tv.tv_sec - stv->tv_sec) * 1000000;
436 if (CLKF_USERMODE(frame)) {
438 * Came from userland, handle user time and deal with
441 if (p && (p->p_flag & P_PROFIL))
442 addupc_intr(p, CLKF_PC(frame), 1);
443 #if 0 /* SMP and BETTER_CLOCK */
445 forward_statclock(pscnt);
447 td->td_uticks += bump;
450 * Charge the time as appropriate
452 if (p && p->p_nice > NZERO)
453 cp_time[CP_NICE] += bump;
455 cp_time[CP_USER] += bump;
459 * Kernel statistics are just like addupc_intr, only easier.
462 if (g->state == GMON_PROF_ON) {
463 i = CLKF_PC(frame) - g->lowpc;
464 if (i < g->textsize) {
465 i /= HISTFRACTION * sizeof(*g->kcount);
470 #if 0 /* SMP and BETTER_CLOCK */
472 forward_statclock(pscnt);
475 * Came from kernel mode, so we were:
476 * - handling an interrupt,
477 * - doing syscall or trap work on behalf of the current
479 * - spinning in the idle loop.
480 * Whichever it is, charge the time as appropriate.
481 * Note that we charge interrupts to the current process,
482 * regardless of whether they are ``for'' that process,
483 * so that we know how much of its real time was spent
484 * in ``non-process'' (i.e., interrupt) work.
486 if (CLKF_INTR(frame))
487 td->td_iticks += bump;
489 td->td_sticks += bump;
491 if (CLKF_INTR(frame)) {
492 cp_time[CP_INTR] += bump;
494 if (td == &mycpu->gd_idlethread)
495 cp_time[CP_IDLE] += bump;
497 cp_time[CP_SYS] += bump;
502 * bump psticks and check against gd_psticks. When we hit the
503 * 1*hz mark (psdiv ticks) we do the more expensive stuff. If
504 * psdiv changes we reset everything to avoid confusion.
507 if (psticks < mycpu->gd_psticks && psdiv == mycpu->gd_psdiv)
510 mycpu->gd_psdiv = psdiv;
511 mycpu->gd_psticks = psticks + psdiv;
514 * XXX YYY DragonFly... need to rewrite all of this,
515 * only schedclock is distributed at the moment
519 if (smp_started && invltlb_ok && !cold && !panicstr) /* YYY */
520 lwkt_send_ipiq_mask(mycpu->gd_other_cpus, schedclock, NULL);
524 /* Update resource usage integrals and maximums. */
525 if ((pstats = p->p_stats) != NULL &&
526 (ru = &pstats->p_ru) != NULL &&
527 (vm = p->p_vmspace) != NULL) {
528 ru->ru_ixrss += pgtok(vm->vm_tsize);
529 ru->ru_idrss += pgtok(vm->vm_dsize);
530 ru->ru_isrss += pgtok(vm->vm_ssize);
531 rss = pgtok(vmspace_resident_count(vm));
532 if (ru->ru_maxrss < rss)
539 * Return information about system clocks.
542 sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
544 struct clockinfo clkinfo;
546 * Construct clockinfo structure.
550 clkinfo.tickadj = tickadj;
551 clkinfo.profhz = profhz;
552 clkinfo.stathz = stathz ? stathz : hz;
553 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req));
556 SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
557 0, 0, sysctl_kern_clockrate, "S,clockinfo","");
559 static __inline unsigned
560 tco_delta(struct timecounter *tc)
563 return ((tc->tc_get_timecount(tc) - tc->tc_offset_count) &
564 tc->tc_counter_mask);
568 * We have eight functions for looking at the clock, four for
569 * microseconds and four for nanoseconds. For each there is fast
570 * but less precise version "get{nano|micro}[up]time" which will
571 * return a time which is up to 1/HZ previous to the call, whereas
572 * the raw version "{nano|micro}[up]time" will return a timestamp
573 * which is as precise as possible. The "up" variants return the
574 * time relative to system boot, these are well suited for time
575 * interval measurements.
579 getmicrotime(struct timeval *tvp)
581 struct timecounter *tc;
585 *tvp = tc->tc_microtime;
592 getnanotime(struct timespec *tsp)
594 struct timecounter *tc;
598 *tsp = tc->tc_nanotime;
605 microtime(struct timeval *tv)
607 struct timecounter *tc;
610 tv->tv_sec = tc->tc_offset_sec;
611 tv->tv_usec = tc->tc_offset_micro;
612 tv->tv_usec += ((u_int64_t)tco_delta(tc) * tc->tc_scale_micro) >> 32;
613 tv->tv_usec += boottime.tv_usec;
614 tv->tv_sec += boottime.tv_sec;
615 while (tv->tv_usec < 0) {
616 tv->tv_usec += 1000000;
620 while (tv->tv_usec >= 1000000) {
621 tv->tv_usec -= 1000000;
627 nanotime(struct timespec *ts)
631 struct timecounter *tc;
634 ts->tv_sec = tc->tc_offset_sec;
635 count = tco_delta(tc);
636 delta = tc->tc_offset_nano;
637 delta += ((u_int64_t)count * tc->tc_scale_nano_f);
639 delta += ((u_int64_t)count * tc->tc_scale_nano_i);
640 delta += boottime.tv_usec * 1000;
641 ts->tv_sec += boottime.tv_sec;
647 while (delta >= 1000000000) {
655 getmicrouptime(struct timeval *tvp)
657 struct timecounter *tc;
661 tvp->tv_sec = tc->tc_offset_sec;
662 tvp->tv_usec = tc->tc_offset_micro;
669 getnanouptime(struct timespec *tsp)
671 struct timecounter *tc;
675 tsp->tv_sec = tc->tc_offset_sec;
676 tsp->tv_nsec = tc->tc_offset_nano >> 32;
683 microuptime(struct timeval *tv)
685 struct timecounter *tc;
688 tv->tv_sec = tc->tc_offset_sec;
689 tv->tv_usec = tc->tc_offset_micro;
690 tv->tv_usec += ((u_int64_t)tco_delta(tc) * tc->tc_scale_micro) >> 32;
691 while (tv->tv_usec < 0) {
692 tv->tv_usec += 1000000;
696 while (tv->tv_usec >= 1000000) {
697 tv->tv_usec -= 1000000;
703 nanouptime(struct timespec *ts)
707 struct timecounter *tc;
710 ts->tv_sec = tc->tc_offset_sec;
711 count = tco_delta(tc);
712 delta = tc->tc_offset_nano;
713 delta += ((u_int64_t)count * tc->tc_scale_nano_f);
715 delta += ((u_int64_t)count * tc->tc_scale_nano_i);
721 while (delta >= 1000000000) {
729 tco_setscales(struct timecounter *tc)
733 scale = 1000000000LL << 32;
734 scale += tc->tc_adjustment;
735 scale /= tc->tc_tweak->tc_frequency;
736 tc->tc_scale_micro = scale / 1000;
737 tc->tc_scale_nano_f = scale & 0xffffffff;
738 tc->tc_scale_nano_i = scale >> 32;
742 update_timecounter(struct timecounter *tc)
748 init_timecounter(struct timecounter *tc)
751 struct timecounter *t1, *t2, *t3;
755 u = tc->tc_frequency / tc->tc_counter_mask;
757 printf("Timecounter \"%s\" frequency %lu Hz"
758 " -- Insufficient hz, needs at least %u\n",
759 tc->tc_name, (u_long) tc->tc_frequency, u);
763 tc->tc_adjustment = 0;
766 tc->tc_offset_count = tc->tc_get_timecount(tc);
767 if (timecounter == &dummy_timecounter)
770 tc->tc_avail = timecounter->tc_tweak->tc_avail;
771 timecounter->tc_tweak->tc_avail = tc;
773 MALLOC(t1, struct timecounter *, sizeof *t1, M_TIMECOUNTER, M_WAITOK);
777 for (i = 1; i < NTIMECOUNTER; i++) {
778 MALLOC(t3, struct timecounter *, sizeof *t3,
779 M_TIMECOUNTER, M_WAITOK);
787 printf("Timecounter \"%s\" frequency %lu Hz\n",
788 tc->tc_name, (u_long)tc->tc_frequency);
790 /* XXX: For now always start using the counter. */
791 tc->tc_offset_count = tc->tc_get_timecount(tc);
793 tc->tc_offset_nano = (u_int64_t)ts1.tv_nsec << 32;
794 tc->tc_offset_micro = ts1.tv_nsec / 1000;
795 tc->tc_offset_sec = ts1.tv_sec;
800 set_timecounter(struct timespec *ts)
805 boottime.tv_sec = ts->tv_sec - ts2.tv_sec;
806 boottime.tv_usec = (ts->tv_nsec - ts2.tv_nsec) / 1000;
807 if (boottime.tv_usec < 0) {
808 boottime.tv_usec += 1000000;
811 /* fiddle all the little crinkly bits around the fiords... */
816 switch_timecounter(struct timecounter *newtc)
819 struct timecounter *tc;
824 if (newtc->tc_tweak == tc->tc_tweak) {
828 newtc = newtc->tc_tweak->tc_other;
830 newtc->tc_offset_sec = ts.tv_sec;
831 newtc->tc_offset_nano = (u_int64_t)ts.tv_nsec << 32;
832 newtc->tc_offset_micro = ts.tv_nsec / 1000;
833 newtc->tc_offset_count = newtc->tc_get_timecount(newtc);
834 tco_setscales(newtc);
839 static struct timecounter *
840 sync_other_counter(void)
842 struct timecounter *tc, *tcn, *tco;
850 delta = tco_delta(tc);
851 tc->tc_offset_count += delta;
852 tc->tc_offset_count &= tc->tc_counter_mask;
853 tc->tc_offset_nano += (u_int64_t)delta * tc->tc_scale_nano_f;
854 tc->tc_offset_nano += (u_int64_t)delta * tc->tc_scale_nano_i << 32;
859 tco_forward(int force)
861 struct timecounter *tc, *tco;
865 tc = sync_other_counter();
867 * We may be inducing a tiny error here, the tc_poll_pps() may
868 * process a latched count which happens after the tco_delta()
869 * in sync_other_counter(), which would extend the previous
870 * counters parameters into the domain of this new one.
871 * Since the timewindow is very small for this, the error is
872 * going to be only a few weenieseconds (as Dave Mills would
873 * say), so lets just not talk more about it, OK ?
875 if (tco->tc_poll_pps)
876 tco->tc_poll_pps(tco);
877 if (timedelta != 0) {
879 tvt.tv_usec += tickdelta;
880 if (tvt.tv_usec >= 1000000) {
882 tvt.tv_usec -= 1000000;
883 } else if (tvt.tv_usec < 0) {
885 tvt.tv_usec += 1000000;
888 timedelta -= tickdelta;
891 while (tc->tc_offset_nano >= 1000000000ULL << 32) {
892 tc->tc_offset_nano -= 1000000000ULL << 32;
894 ntp_update_second(tc); /* XXX only needed if xntpd runs */
899 if (tco_method && !force)
902 tc->tc_offset_micro = (tc->tc_offset_nano / 1000) >> 32;
904 /* Figure out the wall-clock time */
905 tc->tc_nanotime.tv_sec = tc->tc_offset_sec + boottime.tv_sec;
906 tc->tc_nanotime.tv_nsec =
907 (tc->tc_offset_nano >> 32) + boottime.tv_usec * 1000;
908 tc->tc_microtime.tv_usec = tc->tc_offset_micro + boottime.tv_usec;
909 while (tc->tc_nanotime.tv_nsec >= 1000000000) {
910 tc->tc_nanotime.tv_nsec -= 1000000000;
911 tc->tc_microtime.tv_usec -= 1000000;
912 tc->tc_nanotime.tv_sec++;
914 time_second = tc->tc_microtime.tv_sec = tc->tc_nanotime.tv_sec;
919 SYSCTL_NODE(_kern, OID_AUTO, timecounter, CTLFLAG_RW, 0, "");
921 SYSCTL_INT(_kern_timecounter, OID_AUTO, method, CTLFLAG_RW, &tco_method, 0,
922 "This variable determines the method used for updating timecounters. "
923 "If the default algorithm (0) fails with \"calcru negative...\" messages "
924 "try the alternate algorithm (1) which handles bad hardware better."
929 sysctl_kern_timecounter_hardware(SYSCTL_HANDLER_ARGS)
932 struct timecounter *newtc, *tc;
935 tc = timecounter->tc_tweak;
936 strncpy(newname, tc->tc_name, sizeof(newname));
937 error = sysctl_handle_string(oidp, &newname[0], sizeof(newname), req);
938 if (error == 0 && req->newptr != NULL &&
939 strcmp(newname, tc->tc_name) != 0) {
940 for (newtc = tc->tc_avail; newtc != tc;
941 newtc = newtc->tc_avail) {
942 if (strcmp(newname, newtc->tc_name) == 0) {
943 /* Warm up new timecounter. */
944 (void)newtc->tc_get_timecount(newtc);
946 switch_timecounter(newtc);
955 SYSCTL_PROC(_kern_timecounter, OID_AUTO, hardware, CTLTYPE_STRING | CTLFLAG_RW,
956 0, 0, sysctl_kern_timecounter_hardware, "A", "");
960 pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps)
963 struct pps_fetch_args *fapi;
965 struct pps_kcbind_args *kapi;
971 case PPS_IOC_DESTROY:
973 case PPS_IOC_SETPARAMS:
974 app = (pps_params_t *)data;
975 if (app->mode & ~pps->ppscap)
977 pps->ppsparam = *app;
979 case PPS_IOC_GETPARAMS:
980 app = (pps_params_t *)data;
981 *app = pps->ppsparam;
982 app->api_version = PPS_API_VERS_1;
985 *(int*)data = pps->ppscap;
988 fapi = (struct pps_fetch_args *)data;
989 if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC)
991 if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec)
993 pps->ppsinfo.current_mode = pps->ppsparam.mode;
994 fapi->pps_info_buf = pps->ppsinfo;
998 kapi = (struct pps_kcbind_args *)data;
999 /* XXX Only root should be able to do this */
1000 if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC)
1002 if (kapi->kernel_consumer != PPS_KC_HARDPPS)
1004 if (kapi->edge & ~pps->ppscap)
1006 pps->kcmode = kapi->edge;
1009 return (EOPNOTSUPP);
1017 pps_init(struct pps_state *pps)
1019 pps->ppscap |= PPS_TSFMT_TSPEC;
1020 if (pps->ppscap & PPS_CAPTUREASSERT)
1021 pps->ppscap |= PPS_OFFSETASSERT;
1022 if (pps->ppscap & PPS_CAPTURECLEAR)
1023 pps->ppscap |= PPS_OFFSETCLEAR;
1027 pps_event(struct pps_state *pps, struct timecounter *tc, unsigned count, int event)
1029 struct timespec ts, *tsp, *osp;
1031 unsigned tcount, *pcount;
1035 /* Things would be easier with arrays... */
1036 if (event == PPS_CAPTUREASSERT) {
1037 tsp = &pps->ppsinfo.assert_timestamp;
1038 osp = &pps->ppsparam.assert_offset;
1039 foff = pps->ppsparam.mode & PPS_OFFSETASSERT;
1040 fhard = pps->kcmode & PPS_CAPTUREASSERT;
1041 pcount = &pps->ppscount[0];
1042 pseq = &pps->ppsinfo.assert_sequence;
1044 tsp = &pps->ppsinfo.clear_timestamp;
1045 osp = &pps->ppsparam.clear_offset;
1046 foff = pps->ppsparam.mode & PPS_OFFSETCLEAR;
1047 fhard = pps->kcmode & PPS_CAPTURECLEAR;
1048 pcount = &pps->ppscount[1];
1049 pseq = &pps->ppsinfo.clear_sequence;
1052 /* The timecounter changed: bail */
1054 pps->ppstc->tc_name != tc->tc_name ||
1055 tc->tc_name != timecounter->tc_name) {
1061 /* Nothing really happened */
1062 if (*pcount == count)
1067 /* Convert the count to timespec */
1068 ts.tv_sec = tc->tc_offset_sec;
1069 tcount = count - tc->tc_offset_count;
1070 tcount &= tc->tc_counter_mask;
1071 delta = tc->tc_offset_nano;
1072 delta += ((u_int64_t)tcount * tc->tc_scale_nano_f);
1074 delta += ((u_int64_t)tcount * tc->tc_scale_nano_i);
1075 delta += boottime.tv_usec * 1000;
1076 ts.tv_sec += boottime.tv_sec;
1077 while (delta >= 1000000000) {
1078 delta -= 1000000000;
1087 timespecadd(tsp, osp);
1088 if (tsp->tv_nsec < 0) {
1089 tsp->tv_nsec += 1000000000;
1095 /* magic, at its best... */
1096 tcount = count - pps->ppscount[2];
1097 pps->ppscount[2] = count;
1098 tcount &= tc->tc_counter_mask;
1099 delta = ((u_int64_t)tcount * tc->tc_tweak->tc_scale_nano_f);
1101 delta += ((u_int64_t)tcount * tc->tc_tweak->tc_scale_nano_i);
1102 hardpps(tsp, delta);