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.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
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
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 1.14 2004/01/07 20:21:46 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>
62 #include <sys/thread2.h>
64 #include <machine/cpu.h>
65 #include <machine/limits.h>
66 #include <machine/smp.h>
73 extern void init_device_poll(void);
74 extern void hardclock_device_poll(void);
75 #endif /* DEVICE_POLLING */
78 * Number of timecounters used to implement stable storage
81 #define NTIMECOUNTER 5
84 static MALLOC_DEFINE(M_TIMECOUNTER, "timecounter",
85 "Timecounter stable storage");
87 static void initclocks (void *dummy);
88 SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL)
90 static void tco_forward (int force);
91 static void tco_setscales (struct timecounter *tc);
92 static __inline unsigned tco_delta (struct timecounter *tc);
95 * Some of these don't belong here, but it's easiest to concentrate them.
96 * Note that cp_time[] counts in microseconds, but most userland programs
97 * just compare relative times against the total by delta.
99 long cp_time[CPUSTATES];
101 SYSCTL_OPAQUE(_kern, OID_AUTO, cp_time, CTLFLAG_RD, &cp_time, sizeof(cp_time),
102 "LU", "CPU time statistics");
111 struct timeval boottime;
112 SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD,
113 &boottime, timeval, "System boottime");
116 * Which update policy to use.
117 * 0 - every tick, bad hardware may fail with "calcru negative..."
118 * 1 - more resistent to the above hardware, but less efficient.
120 static int tco_method;
123 * Implement a dummy timecounter which we can use until we get a real one
124 * in the air. This allows the console and other early stuff to use
129 dummy_get_timecount(struct timecounter *tc)
135 static struct timecounter dummy_timecounter = {
143 struct timecounter *timecounter = &dummy_timecounter;
146 * Clock handling routines.
148 * This code is written to operate with two timers that run independently of
151 * The main timer, running hz times per second, is used to trigger interval
152 * timers, timeouts and rescheduling as needed.
154 * The second timer handles kernel and user profiling,
155 * and does resource use estimation. If the second timer is programmable,
156 * it is randomized to avoid aliasing between the two clocks. For example,
157 * the randomization prevents an adversary from always giving up the cpu
158 * just before its quantum expires. Otherwise, it would never accumulate
159 * cpu ticks. The mean frequency of the second timer is stathz.
161 * If no second timer exists, stathz will be zero; in this case we drive
162 * profiling and statistics off the main clock. This WILL NOT be accurate;
163 * do not do it unless absolutely necessary.
165 * The statistics clock may (or may not) be run at a higher rate while
166 * profiling. This profile clock runs at profhz. We require that profhz
167 * be an integral multiple of stathz.
169 * If the statistics clock is running fast, it must be divided by the ratio
170 * profhz/stathz for statistics. (For profiling, every tick counts.)
172 * Time-of-day is maintained using a "timecounter", which may or may
173 * not be related to the hardware generating the above mentioned
179 static int profprocs;
181 static int psticks; /* profiler ticks */
182 static int psdiv; /* prof / stat divider */
183 int psratio; /* ratio: prof * 100 / stat */
186 * Initialize clock frequencies and start both clocks running.
196 * Set divisors to 1 (normal case) and let the machine-specific
202 #ifdef DEVICE_POLLING
207 * Compute profhz/stathz, and fix profhz if needed.
209 i = stathz ? stathz : hz;
212 psratio = profhz / i;
216 * The real-time timer, interrupting hz times per second. This is implemented
217 * as a FAST interrupt so it is in the context of the thread it interrupted,
218 * and not in an interrupt thread. YYY needs help.
222 struct clockframe *frame;
228 struct pstats *pstats;
231 * Run current process's virtual and profile time, as needed.
234 if (CLKF_USERMODE(frame) &&
235 timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) &&
236 itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0)
237 psignal(p, SIGVTALRM);
238 if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value) &&
239 itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0)
243 #if 0 /* SMP and BETTER_CLOCK */
244 forward_hardclock(pscnt);
248 * If no separate statistics clock is available, run it from here.
256 #ifdef DEVICE_POLLING
257 hardclock_device_poll(); /* this is very short and quick */
258 #endif /* DEVICE_POLLING */
261 * Process callouts at a very low cpu priority, so we don't keep the
262 * relatively high clock interrupt priority any longer than necessary.
264 if (TAILQ_FIRST(&callwheel[ticks & callwheelmask]) != NULL) {
266 } else if (softticks + 1 == ticks) {
272 * Compute number of ticks for the specified amount of time. The
273 * return value is intended to be used in a clock interrupt timed
274 * operation and guarenteed to meet or exceed the requested time.
275 * If the representation overflows, return INT_MAX. The minimum return
276 * value is 1 ticks and the function will average the calculation up.
277 * If any value greater then 0 microseconds is supplied, a value
278 * of at least 2 will be returned to ensure that a near-term clock
279 * interrupt does not cause the timeout to occur (degenerately) early.
281 * Note that limit checks must take into account microseconds, which is
282 * done simply by using the smaller signed long maximum instead of
283 * the unsigned long maximum.
285 * If ints have 32 bits, then the maximum value for any timeout in
286 * 10ms ticks is 248 days.
289 tvtohz_high(struct timeval *tv)
306 printf("tvotohz: negative time difference %ld sec %ld usec\n",
310 } else if (sec <= INT_MAX / hz) {
311 ticks = (int)(sec * hz +
312 ((u_long)usec + (tick - 1)) / tick) + 1;
320 * Compute number of ticks for the specified amount of time, erroring on
321 * the side of it being too low to ensure that sleeping the returned number
322 * of ticks will not result in a late return.
324 * The supplied timeval may not be negative and should be normalized. A
325 * return value of 0 is possible if the timeval converts to less then
328 * If ints have 32 bits, then the maximum value for any timeout in
329 * 10ms ticks is 248 days.
332 tvtohz_low(struct timeval *tv)
338 if (sec <= INT_MAX / hz)
339 ticks = (int)(sec * hz + (u_long)tv->tv_usec / tick);
347 * Start profiling on a process.
349 * Kernel profiling passes proc0 which never exits and hence
350 * keeps the profile clock running constantly.
358 if ((p->p_flag & P_PROFIL) == 0) {
359 p->p_flag |= P_PROFIL;
360 if (++profprocs == 1 && stathz != 0) {
363 setstatclockrate(profhz);
370 * Stop profiling on a process.
378 if (p->p_flag & P_PROFIL) {
379 p->p_flag &= ~P_PROFIL;
380 if (--profprocs == 0 && stathz != 0) {
383 setstatclockrate(stathz);
390 * Statistics clock. Grab profile sample, and if divider reaches 0,
391 * do process and kernel statistics. Most of the statistics are only
392 * used by user-level statistics programs. The main exceptions are
393 * p->p_uticks, p->p_sticks, p->p_iticks, and p->p_estcpu.
395 * The statclock should be called from an exclusive, fast interrupt,
396 * so the context should be the thread/process that got interrupted and
397 * not an interrupt thread.
401 struct clockframe *frame;
408 struct pstats *pstats;
418 * How big was our timeslice relative to the last time
421 stv = &mycpu->gd_stattv;
422 if (stv->tv_sec == 0) {
425 bump = tv.tv_usec - stv->tv_usec +
426 (tv.tv_sec - stv->tv_sec) * 1000000;
437 if (CLKF_USERMODE(frame)) {
439 * Came from userland, handle user time and deal with
442 if (p && (p->p_flag & P_PROFIL))
443 addupc_intr(p, CLKF_PC(frame), 1);
444 #if 0 /* SMP and BETTER_CLOCK */
446 forward_statclock(pscnt);
448 td->td_uticks += bump;
451 * Charge the time as appropriate
453 if (p && p->p_nice > NZERO)
454 cp_time[CP_NICE] += bump;
456 cp_time[CP_USER] += bump;
460 * Kernel statistics are just like addupc_intr, only easier.
463 if (g->state == GMON_PROF_ON) {
464 i = CLKF_PC(frame) - g->lowpc;
465 if (i < g->textsize) {
466 i /= HISTFRACTION * sizeof(*g->kcount);
471 #if 0 /* SMP and BETTER_CLOCK */
473 forward_statclock(pscnt);
476 * Came from kernel mode, so we were:
477 * - handling an interrupt,
478 * - doing syscall or trap work on behalf of the current
480 * - spinning in the idle loop.
481 * Whichever it is, charge the time as appropriate.
482 * Note that we charge interrupts to the current process,
483 * regardless of whether they are ``for'' that process,
484 * so that we know how much of its real time was spent
485 * in ``non-process'' (i.e., interrupt) work.
487 if (CLKF_INTR(frame))
488 td->td_iticks += bump;
490 td->td_sticks += bump;
492 if (CLKF_INTR(frame)) {
493 cp_time[CP_INTR] += bump;
495 if (td == &mycpu->gd_idlethread)
496 cp_time[CP_IDLE] += bump;
498 cp_time[CP_SYS] += bump;
503 * bump psticks and check against gd_psticks. When we hit the
504 * 1*hz mark (psdiv ticks) we do the more expensive stuff. If
505 * psdiv changes we reset everything to avoid confusion.
508 if (psticks < mycpu->gd_psticks && psdiv == mycpu->gd_psdiv)
511 mycpu->gd_psdiv = psdiv;
512 mycpu->gd_psticks = psticks + psdiv;
515 * XXX YYY DragonFly... need to rewrite all of this,
516 * only schedclock is distributed at the moment
520 if (smp_started && invltlb_ok && !cold && !panicstr) /* YYY */
521 lwkt_send_ipiq_mask(mycpu->gd_other_cpus, schedclock, NULL);
525 /* Update resource usage integrals and maximums. */
526 if ((pstats = p->p_stats) != NULL &&
527 (ru = &pstats->p_ru) != NULL &&
528 (vm = p->p_vmspace) != NULL) {
529 ru->ru_ixrss += pgtok(vm->vm_tsize);
530 ru->ru_idrss += pgtok(vm->vm_dsize);
531 ru->ru_isrss += pgtok(vm->vm_ssize);
532 rss = pgtok(vmspace_resident_count(vm));
533 if (ru->ru_maxrss < rss)
540 * Return information about system clocks.
543 sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
545 struct clockinfo clkinfo;
547 * Construct clockinfo structure.
551 clkinfo.tickadj = tickadj;
552 clkinfo.profhz = profhz;
553 clkinfo.stathz = stathz ? stathz : hz;
554 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req));
557 SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
558 0, 0, sysctl_kern_clockrate, "S,clockinfo","");
560 static __inline unsigned
561 tco_delta(struct timecounter *tc)
564 return ((tc->tc_get_timecount(tc) - tc->tc_offset_count) &
565 tc->tc_counter_mask);
569 * We have eight functions for looking at the clock, four for
570 * microseconds and four for nanoseconds. For each there is fast
571 * but less precise version "get{nano|micro}[up]time" which will
572 * return a time which is up to 1/HZ previous to the call, whereas
573 * the raw version "{nano|micro}[up]time" will return a timestamp
574 * which is as precise as possible. The "up" variants return the
575 * time relative to system boot, these are well suited for time
576 * interval measurements.
580 getmicrotime(struct timeval *tvp)
582 struct timecounter *tc;
586 *tvp = tc->tc_microtime;
593 getnanotime(struct timespec *tsp)
595 struct timecounter *tc;
599 *tsp = tc->tc_nanotime;
606 microtime(struct timeval *tv)
608 struct timecounter *tc;
613 delta = tco_delta(tc);
614 tv->tv_sec = tc->tc_offset_sec;
615 tv->tv_usec = tc->tc_offset_micro;
616 tv->tv_usec += ((u_int64_t)delta * tc->tc_scale_micro) >> 32;
618 tv->tv_usec += boottime.tv_usec;
619 tv->tv_sec += boottime.tv_sec;
620 while (tv->tv_usec < 0) {
621 tv->tv_usec += 1000000;
625 while (tv->tv_usec >= 1000000) {
626 tv->tv_usec -= 1000000;
632 nanotime(struct timespec *ts)
636 struct timecounter *tc;
640 ts->tv_sec = tc->tc_offset_sec;
641 count = tco_delta(tc);
642 delta = tc->tc_offset_nano;
644 delta += ((u_int64_t)count * tc->tc_scale_nano_f);
646 delta += ((u_int64_t)count * tc->tc_scale_nano_i);
647 delta += boottime.tv_usec * 1000;
648 ts->tv_sec += boottime.tv_sec;
654 while (delta >= 1000000000) {
662 getmicrouptime(struct timeval *tvp)
664 struct timecounter *tc;
668 tvp->tv_sec = tc->tc_offset_sec;
669 tvp->tv_usec = tc->tc_offset_micro;
676 getnanouptime(struct timespec *tsp)
678 struct timecounter *tc;
682 tsp->tv_sec = tc->tc_offset_sec;
683 tsp->tv_nsec = tc->tc_offset_nano >> 32;
690 microuptime(struct timeval *tv)
692 struct timecounter *tc;
695 tv->tv_sec = tc->tc_offset_sec;
696 tv->tv_usec = tc->tc_offset_micro;
697 tv->tv_usec += ((u_int64_t)tco_delta(tc) * tc->tc_scale_micro) >> 32;
698 while (tv->tv_usec < 0) {
699 tv->tv_usec += 1000000;
703 while (tv->tv_usec >= 1000000) {
704 tv->tv_usec -= 1000000;
710 nanouptime(struct timespec *ts)
714 struct timecounter *tc;
717 ts->tv_sec = tc->tc_offset_sec;
718 count = tco_delta(tc);
719 delta = tc->tc_offset_nano;
720 delta += ((u_int64_t)count * tc->tc_scale_nano_f);
722 delta += ((u_int64_t)count * tc->tc_scale_nano_i);
728 while (delta >= 1000000000) {
736 tco_setscales(struct timecounter *tc)
740 scale = 1000000000LL << 32;
741 scale += tc->tc_adjustment;
742 scale /= tc->tc_tweak->tc_frequency;
743 tc->tc_scale_micro = scale / 1000;
744 tc->tc_scale_nano_f = scale & 0xffffffff;
745 tc->tc_scale_nano_i = scale >> 32;
749 update_timecounter(struct timecounter *tc)
755 init_timecounter(struct timecounter *tc)
758 struct timecounter *t1, *t2, *t3;
762 u = tc->tc_frequency / tc->tc_counter_mask;
764 printf("Timecounter \"%s\" frequency %lu Hz"
765 " -- Insufficient hz, needs at least %u\n",
766 tc->tc_name, (u_long) tc->tc_frequency, u);
770 tc->tc_adjustment = 0;
773 tc->tc_offset_count = tc->tc_get_timecount(tc);
774 if (timecounter == &dummy_timecounter)
777 tc->tc_avail = timecounter->tc_tweak->tc_avail;
778 timecounter->tc_tweak->tc_avail = tc;
780 MALLOC(t1, struct timecounter *, sizeof *t1, M_TIMECOUNTER, M_WAITOK);
784 for (i = 1; i < NTIMECOUNTER; i++) {
785 MALLOC(t3, struct timecounter *, sizeof *t3,
786 M_TIMECOUNTER, M_WAITOK);
794 printf("Timecounter \"%s\" frequency %lu Hz\n",
795 tc->tc_name, (u_long)tc->tc_frequency);
797 /* XXX: For now always start using the counter. */
798 tc->tc_offset_count = tc->tc_get_timecount(tc);
800 tc->tc_offset_nano = (u_int64_t)ts1.tv_nsec << 32;
801 tc->tc_offset_micro = ts1.tv_nsec / 1000;
802 tc->tc_offset_sec = ts1.tv_sec;
807 set_timecounter(struct timespec *ts)
812 boottime.tv_sec = ts->tv_sec - ts2.tv_sec;
813 boottime.tv_usec = (ts->tv_nsec - ts2.tv_nsec) / 1000;
814 if (boottime.tv_usec < 0) {
815 boottime.tv_usec += 1000000;
818 /* fiddle all the little crinkly bits around the fiords... */
823 switch_timecounter(struct timecounter *newtc)
826 struct timecounter *tc;
831 if (newtc->tc_tweak == tc->tc_tweak) {
835 newtc = newtc->tc_tweak->tc_other;
837 newtc->tc_offset_sec = ts.tv_sec;
838 newtc->tc_offset_nano = (u_int64_t)ts.tv_nsec << 32;
839 newtc->tc_offset_micro = ts.tv_nsec / 1000;
840 newtc->tc_offset_count = newtc->tc_get_timecount(newtc);
841 tco_setscales(newtc);
846 static struct timecounter *
847 sync_other_counter(void)
849 struct timecounter *tc, *tcn, *tco;
857 delta = tco_delta(tc);
858 tc->tc_offset_count += delta;
859 tc->tc_offset_count &= tc->tc_counter_mask;
860 tc->tc_offset_nano += (u_int64_t)delta * tc->tc_scale_nano_f;
861 tc->tc_offset_nano += (u_int64_t)delta * tc->tc_scale_nano_i << 32;
866 tco_forward(int force)
868 struct timecounter *tc, *tco;
872 tc = sync_other_counter();
874 * We may be inducing a tiny error here, the tc_poll_pps() may
875 * process a latched count which happens after the tco_delta()
876 * in sync_other_counter(), which would extend the previous
877 * counters parameters into the domain of this new one.
878 * Since the timewindow is very small for this, the error is
879 * going to be only a few weenieseconds (as Dave Mills would
880 * say), so lets just not talk more about it, OK ?
882 if (tco->tc_poll_pps)
883 tco->tc_poll_pps(tco);
884 if (timedelta != 0) {
886 tvt.tv_usec += tickdelta;
887 if (tvt.tv_usec >= 1000000) {
889 tvt.tv_usec -= 1000000;
890 } else if (tvt.tv_usec < 0) {
892 tvt.tv_usec += 1000000;
895 timedelta -= tickdelta;
898 while (tc->tc_offset_nano >= 1000000000ULL << 32) {
899 tc->tc_offset_nano -= 1000000000ULL << 32;
901 ntp_update_second(tc); /* XXX only needed if xntpd runs */
906 if (tco_method && !force)
909 tc->tc_offset_micro = (tc->tc_offset_nano / 1000) >> 32;
911 /* Figure out the wall-clock time */
912 tc->tc_nanotime.tv_sec = tc->tc_offset_sec + boottime.tv_sec;
913 tc->tc_nanotime.tv_nsec =
914 (tc->tc_offset_nano >> 32) + boottime.tv_usec * 1000;
915 tc->tc_microtime.tv_usec = tc->tc_offset_micro + boottime.tv_usec;
916 while (tc->tc_nanotime.tv_nsec >= 1000000000) {
917 tc->tc_nanotime.tv_nsec -= 1000000000;
918 tc->tc_microtime.tv_usec -= 1000000;
919 tc->tc_nanotime.tv_sec++;
921 time_second = tc->tc_microtime.tv_sec = tc->tc_nanotime.tv_sec;
926 SYSCTL_NODE(_kern, OID_AUTO, timecounter, CTLFLAG_RW, 0, "");
928 SYSCTL_INT(_kern_timecounter, OID_AUTO, method, CTLFLAG_RW, &tco_method, 0,
929 "This variable determines the method used for updating timecounters. "
930 "If the default algorithm (0) fails with \"calcru negative...\" messages "
931 "try the alternate algorithm (1) which handles bad hardware better."
936 sysctl_kern_timecounter_hardware(SYSCTL_HANDLER_ARGS)
939 struct timecounter *newtc, *tc;
942 tc = timecounter->tc_tweak;
943 strncpy(newname, tc->tc_name, sizeof(newname));
944 error = sysctl_handle_string(oidp, &newname[0], sizeof(newname), req);
945 if (error == 0 && req->newptr != NULL &&
946 strcmp(newname, tc->tc_name) != 0) {
947 for (newtc = tc->tc_avail; newtc != tc;
948 newtc = newtc->tc_avail) {
949 if (strcmp(newname, newtc->tc_name) == 0) {
950 /* Warm up new timecounter. */
951 (void)newtc->tc_get_timecount(newtc);
953 switch_timecounter(newtc);
962 SYSCTL_PROC(_kern_timecounter, OID_AUTO, hardware, CTLTYPE_STRING | CTLFLAG_RW,
963 0, 0, sysctl_kern_timecounter_hardware, "A", "");
967 pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps)
970 struct pps_fetch_args *fapi;
972 struct pps_kcbind_args *kapi;
978 case PPS_IOC_DESTROY:
980 case PPS_IOC_SETPARAMS:
981 app = (pps_params_t *)data;
982 if (app->mode & ~pps->ppscap)
984 pps->ppsparam = *app;
986 case PPS_IOC_GETPARAMS:
987 app = (pps_params_t *)data;
988 *app = pps->ppsparam;
989 app->api_version = PPS_API_VERS_1;
992 *(int*)data = pps->ppscap;
995 fapi = (struct pps_fetch_args *)data;
996 if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC)
998 if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec)
1000 pps->ppsinfo.current_mode = pps->ppsparam.mode;
1001 fapi->pps_info_buf = pps->ppsinfo;
1003 case PPS_IOC_KCBIND:
1005 kapi = (struct pps_kcbind_args *)data;
1006 /* XXX Only root should be able to do this */
1007 if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC)
1009 if (kapi->kernel_consumer != PPS_KC_HARDPPS)
1011 if (kapi->edge & ~pps->ppscap)
1013 pps->kcmode = kapi->edge;
1016 return (EOPNOTSUPP);
1024 pps_init(struct pps_state *pps)
1026 pps->ppscap |= PPS_TSFMT_TSPEC;
1027 if (pps->ppscap & PPS_CAPTUREASSERT)
1028 pps->ppscap |= PPS_OFFSETASSERT;
1029 if (pps->ppscap & PPS_CAPTURECLEAR)
1030 pps->ppscap |= PPS_OFFSETCLEAR;
1034 pps_event(struct pps_state *pps, struct timecounter *tc, unsigned count, int event)
1036 struct timespec ts, *tsp, *osp;
1038 unsigned tcount, *pcount;
1042 /* Things would be easier with arrays... */
1043 if (event == PPS_CAPTUREASSERT) {
1044 tsp = &pps->ppsinfo.assert_timestamp;
1045 osp = &pps->ppsparam.assert_offset;
1046 foff = pps->ppsparam.mode & PPS_OFFSETASSERT;
1047 fhard = pps->kcmode & PPS_CAPTUREASSERT;
1048 pcount = &pps->ppscount[0];
1049 pseq = &pps->ppsinfo.assert_sequence;
1051 tsp = &pps->ppsinfo.clear_timestamp;
1052 osp = &pps->ppsparam.clear_offset;
1053 foff = pps->ppsparam.mode & PPS_OFFSETCLEAR;
1054 fhard = pps->kcmode & PPS_CAPTURECLEAR;
1055 pcount = &pps->ppscount[1];
1056 pseq = &pps->ppsinfo.clear_sequence;
1059 /* The timecounter changed: bail */
1061 pps->ppstc->tc_name != tc->tc_name ||
1062 tc->tc_name != timecounter->tc_name) {
1068 /* Nothing really happened */
1069 if (*pcount == count)
1074 /* Convert the count to timespec */
1075 ts.tv_sec = tc->tc_offset_sec;
1076 tcount = count - tc->tc_offset_count;
1077 tcount &= tc->tc_counter_mask;
1078 delta = tc->tc_offset_nano;
1079 delta += ((u_int64_t)tcount * tc->tc_scale_nano_f);
1081 delta += ((u_int64_t)tcount * tc->tc_scale_nano_i);
1082 delta += boottime.tv_usec * 1000;
1083 ts.tv_sec += boottime.tv_sec;
1084 while (delta >= 1000000000) {
1085 delta -= 1000000000;
1094 timespecadd(tsp, osp);
1095 if (tsp->tv_nsec < 0) {
1096 tsp->tv_nsec += 1000000000;
1102 /* magic, at its best... */
1103 tcount = count - pps->ppscount[2];
1104 pps->ppscount[2] = count;
1105 tcount &= tc->tc_counter_mask;
1106 delta = ((u_int64_t)tcount * tc->tc_tweak->tc_scale_nano_f);
1108 delta += ((u_int64_t)tcount * tc->tc_tweak->tc_scale_nano_i);
1109 hardpps(tsp, delta);