2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * Copyright (c) 1997, 1998 Poul-Henning Kamp <phk@FreeBSD.org>
35 * Copyright (c) 1982, 1986, 1991, 1993
36 * The Regents of the University of California. All rights reserved.
37 * (c) UNIX System Laboratories, Inc.
38 * All or some portions of this file are derived from material licensed
39 * to the University of California by American Telephone and Telegraph
40 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
41 * the permission of UNIX System Laboratories, Inc.
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
51 * 3. All advertising materials mentioning features or use of this software
52 * must display the following acknowledgement:
53 * This product includes software developed by the University of
54 * California, Berkeley and its contributors.
55 * 4. Neither the name of the University nor the names of its contributors
56 * may be used to endorse or promote products derived from this software
57 * without specific prior written permission.
59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
71 * @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
72 * $FreeBSD: src/sys/kern/kern_clock.c,v 1.105.2.10 2002/10/17 13:19:40 maxim Exp $
73 * $DragonFly: src/sys/kern/kern_clock.c,v 1.21 2004/07/16 05:51:09 dillon Exp $
78 #include <sys/param.h>
79 #include <sys/systm.h>
80 #include <sys/dkstat.h>
81 #include <sys/callout.h>
82 #include <sys/kernel.h>
84 #include <sys/malloc.h>
85 #include <sys/resourcevar.h>
86 #include <sys/signalvar.h>
87 #include <sys/timex.h>
88 #include <sys/timepps.h>
92 #include <vm/vm_map.h>
93 #include <sys/sysctl.h>
94 #include <sys/thread2.h>
96 #include <machine/cpu.h>
97 #include <machine/limits.h>
98 #include <machine/smp.h>
101 #include <sys/gmon.h>
104 #ifdef DEVICE_POLLING
105 extern void init_device_poll(void);
106 extern void hardclock_device_poll(void);
107 #endif /* DEVICE_POLLING */
109 static void initclocks (void *dummy);
110 SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL)
113 * Some of these don't belong here, but it's easiest to concentrate them.
114 * Note that cp_time[] counts in microseconds, but most userland programs
115 * just compare relative times against the total by delta.
117 long cp_time[CPUSTATES];
119 SYSCTL_OPAQUE(_kern, OID_AUTO, cp_time, CTLFLAG_RD, &cp_time, sizeof(cp_time),
120 "LU", "CPU time statistics");
128 * boottime is used to calculate the 'real' uptime. Do not confuse this with
129 * microuptime(). microtime() is not drift compensated. The real uptime
130 * with compensation is nanotime() - bootime. boottime is recalculated
131 * whenever the real time is set based on the compensated elapsed time
132 * in seconds (gd->gd_time_seconds).
134 * basetime is used to calculate the compensated real time of day. Chunky
135 * changes to the time, aka settimeofday(), are made by modifying basetime.
137 * The gd_time_seconds and gd_cpuclock_base fields remain fairly monotonic.
138 * Slight adjustments to gd_cpuclock_base are made to phase-lock it to
141 struct timespec boottime; /* boot time (realtime) for reference only */
142 struct timespec basetime; /* base time adjusts uptime -> realtime */
143 time_t time_second; /* read-only 'passive' uptime in seconds */
145 SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD,
146 &boottime, timeval, "System boottime");
147 SYSCTL_STRUCT(_kern, OID_AUTO, basetime, CTLFLAG_RD,
148 &basetime, timeval, "System basetime");
150 static void hardclock(systimer_t info, struct intrframe *frame);
151 static void statclock(systimer_t info, struct intrframe *frame);
152 static void schedclock(systimer_t info, struct intrframe *frame);
154 int ticks; /* system master ticks at hz */
155 int64_t nsec_adj; /* ntpd per-tick adjustment in nsec << 32 */
156 int64_t nsec_acc; /* accumulator */
159 * Finish initializing clock frequencies and start all clocks running.
163 initclocks(void *dummy)
166 #ifdef DEVICE_POLLING
169 /*psratio = profhz / stathz;*/
174 * Called on a per-cpu basis
177 initclocks_pcpu(void)
179 struct globaldata *gd = mycpu;
182 if (gd->gd_cpuid == 0) {
183 gd->gd_time_seconds = 1;
184 gd->gd_cpuclock_base = cputimer_count();
187 gd->gd_time_seconds = globaldata_find(0)->gd_time_seconds;
188 gd->gd_cpuclock_base = globaldata_find(0)->gd_cpuclock_base;
190 systimer_init_periodic(&gd->gd_hardclock, hardclock, NULL, hz);
191 systimer_init_periodic(&gd->gd_statclock, statclock, NULL, stathz);
192 /* XXX correct the frequency for scheduler / estcpu tests */
193 systimer_init_periodic(&gd->gd_schedclock, schedclock,
199 * This sets the current real time of day. Timespecs are in seconds and
200 * nanoseconds. We do not mess with gd_time_seconds and gd_cpuclock_base,
201 * instead we adjust basetime so basetime + gd_* results in the current
202 * time of day. This way the gd_* fields are guarenteed to represent
203 * a monotonically increasing 'uptime' value.
206 set_timeofday(struct timespec *ts)
211 * XXX SMP / non-atomic basetime updates
215 basetime.tv_sec = ts->tv_sec - ts2.tv_sec;
216 basetime.tv_nsec = ts->tv_nsec - ts2.tv_nsec;
217 if (basetime.tv_nsec < 0) {
218 basetime.tv_nsec += 1000000000;
221 boottime.tv_sec = basetime.tv_sec - mycpu->gd_time_seconds;
227 * Each cpu has its own hardclock, but we only increments ticks and softticks
230 * NOTE! systimer! the MP lock might not be held here. We can only safely
231 * manipulate objects owned by the current cpu.
234 hardclock(systimer_t info, struct intrframe *frame)
238 struct pstats *pstats;
239 struct globaldata *gd = mycpu;
242 * Realtime updates are per-cpu. Note that timer corrections as
243 * returned by microtime() and friends make an additional adjustment
244 * using a system-wise 'basetime', but the running time is always
245 * taken from the per-cpu globaldata area. Since the same clock
246 * is distributing (XXX SMP) to all cpus, the per-cpu timebases
249 * Note that we never allow info->time (aka gd->gd_hardclock.time)
250 * to reverse index gd_cpuclock_base.
252 cputicks = info->time - gd->gd_cpuclock_base;
253 if (cputicks > cputimer_freq) {
254 ++gd->gd_time_seconds;
255 gd->gd_cpuclock_base += cputimer_freq;
259 * The system-wide ticks and softticks are only updated by cpu #0.
260 * Callwheel actions are also (at the moment) only handled by cpu #0.
261 * Finally, we also do NTP related timedelta/tickdelta adjustments
262 * by adjusting basetime.
264 if (gd->gd_cpuid == 0) {
270 #ifdef DEVICE_POLLING
271 hardclock_device_poll(); /* mpsafe, short and quick */
272 #endif /* DEVICE_POLLING */
274 if (TAILQ_FIRST(&callwheel[ticks & callwheelmask]) != NULL) {
276 } else if (softticks + 1 == ticks) {
281 if (tco->tc_poll_pps)
282 tco->tc_poll_pps(tco);
285 * Apply adjtime corrections. At the moment only do this if
286 * we can get the MP lock to interlock with adjtime's modification
287 * of these variables. Note that basetime adjustments are not
288 * MP safe either XXX.
290 if (timedelta != 0 && try_mplock()) {
291 basetime.tv_nsec += tickdelta * 1000;
292 if (basetime.tv_nsec >= 1000000000) {
293 basetime.tv_nsec -= 1000000000;
295 } else if (basetime.tv_nsec < 0) {
296 basetime.tv_nsec += 1000000000;
299 timedelta -= tickdelta;
304 * Apply per-tick compensation. ticks_adj adjusts for both
305 * offset and frequency, and could be negative.
307 if (nsec_adj != 0 && try_mplock()) {
308 nsec_acc += nsec_adj;
309 if (nsec_acc >= 0x100000000LL) {
310 basetime.tv_nsec += nsec_acc >> 32;
311 nsec_acc = (nsec_acc & 0xFFFFFFFFLL);
312 } else if (nsec_acc <= -0x100000000LL) {
313 basetime.tv_nsec -= -nsec_acc >> 32;
314 nsec_acc = -(-nsec_acc & 0xFFFFFFFFLL);
316 if (basetime.tv_nsec >= 1000000000) {
317 basetime.tv_nsec -= 1000000000;
319 } else if (basetime.tv_nsec < 0) {
320 basetime.tv_nsec += 1000000000;
327 * If the realtime-adjusted seconds hand rolls over then tell
328 * ntp_update_second() what we did in the last second so it can
329 * calculate what to do in the next second. It may also add
330 * or subtract a leap second.
333 if (time_second != nts.tv_sec) {
334 leap = ntp_update_second(time_second, &nsec_adj);
335 basetime.tv_sec += leap;
336 time_second = nts.tv_sec + leap;
342 * ITimer handling is per-tick, per-cpu. I don't think psignal()
343 * is mpsafe on curproc, so XXX get the mplock.
345 if ((p = curproc) != NULL && try_mplock()) {
347 if (frame && CLKF_USERMODE(frame) &&
348 timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) &&
349 itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0)
350 psignal(p, SIGVTALRM);
351 if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value) &&
352 itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0)
360 * The statistics clock typically runs at a 125Hz rate, and is intended
361 * to be frequency offset from the hardclock (typ 100Hz). It is per-cpu.
363 * NOTE! systimer! the MP lock might not be held here. We can only safely
364 * manipulate objects owned by the current cpu.
366 * The stats clock is responsible for grabbing a profiling sample.
367 * Most of the statistics are only used by user-level statistics programs.
368 * The main exceptions are p->p_uticks, p->p_sticks, p->p_iticks, and
371 * Like the other clocks, the stat clock is called from what is effectively
372 * a fast interrupt, so the context should be the thread/process that got
376 statclock(systimer_t info, struct intrframe *frame)
389 * How big was our timeslice relative to the last time?
391 microuptime(&tv); /* mpsafe */
392 stv = &mycpu->gd_stattv;
393 if (stv->tv_sec == 0) {
396 bump = tv.tv_usec - stv->tv_usec +
397 (tv.tv_sec - stv->tv_sec) * 1000000;
408 if (frame && CLKF_USERMODE(frame)) {
410 * Came from userland, handle user time and deal with
413 if (p && (p->p_flag & P_PROFIL))
414 addupc_intr(p, CLKF_PC(frame), 1);
415 td->td_uticks += bump;
418 * Charge the time as appropriate
420 if (p && p->p_nice > NZERO)
421 cp_time[CP_NICE] += bump;
423 cp_time[CP_USER] += bump;
427 * Kernel statistics are just like addupc_intr, only easier.
430 if (g->state == GMON_PROF_ON && frame) {
431 i = CLKF_PC(frame) - g->lowpc;
432 if (i < g->textsize) {
433 i /= HISTFRACTION * sizeof(*g->kcount);
439 * Came from kernel mode, so we were:
440 * - handling an interrupt,
441 * - doing syscall or trap work on behalf of the current
443 * - spinning in the idle loop.
444 * Whichever it is, charge the time as appropriate.
445 * Note that we charge interrupts to the current process,
446 * regardless of whether they are ``for'' that process,
447 * so that we know how much of its real time was spent
448 * in ``non-process'' (i.e., interrupt) work.
450 * XXX assume system if frame is NULL. A NULL frame
451 * can occur if ipi processing is done from an splx().
453 if (frame && CLKF_INTR(frame))
454 td->td_iticks += bump;
456 td->td_sticks += bump;
458 if (frame && CLKF_INTR(frame)) {
459 cp_time[CP_INTR] += bump;
461 if (td == &mycpu->gd_idlethread)
462 cp_time[CP_IDLE] += bump;
464 cp_time[CP_SYS] += bump;
470 * The scheduler clock typically runs at a 20Hz rate. NOTE! systimer,
471 * the MP lock might not be held. We can safely manipulate parts of curproc
472 * but that's about it.
475 schedclock(systimer_t info, struct intrframe *frame)
478 struct pstats *pstats;
483 schedulerclock(NULL); /* mpsafe */
484 if ((p = curproc) != NULL) {
485 /* Update resource usage integrals and maximums. */
486 if ((pstats = p->p_stats) != NULL &&
487 (ru = &pstats->p_ru) != NULL &&
488 (vm = p->p_vmspace) != NULL) {
489 ru->ru_ixrss += pgtok(vm->vm_tsize);
490 ru->ru_idrss += pgtok(vm->vm_dsize);
491 ru->ru_isrss += pgtok(vm->vm_ssize);
492 rss = pgtok(vmspace_resident_count(vm));
493 if (ru->ru_maxrss < rss)
500 * Compute number of ticks for the specified amount of time. The
501 * return value is intended to be used in a clock interrupt timed
502 * operation and guarenteed to meet or exceed the requested time.
503 * If the representation overflows, return INT_MAX. The minimum return
504 * value is 1 ticks and the function will average the calculation up.
505 * If any value greater then 0 microseconds is supplied, a value
506 * of at least 2 will be returned to ensure that a near-term clock
507 * interrupt does not cause the timeout to occur (degenerately) early.
509 * Note that limit checks must take into account microseconds, which is
510 * done simply by using the smaller signed long maximum instead of
511 * the unsigned long maximum.
513 * If ints have 32 bits, then the maximum value for any timeout in
514 * 10ms ticks is 248 days.
517 tvtohz_high(struct timeval *tv)
534 printf("tvotohz: negative time difference %ld sec %ld usec\n",
538 } else if (sec <= INT_MAX / hz) {
539 ticks = (int)(sec * hz +
540 ((u_long)usec + (tick - 1)) / tick) + 1;
548 * Compute number of ticks for the specified amount of time, erroring on
549 * the side of it being too low to ensure that sleeping the returned number
550 * of ticks will not result in a late return.
552 * The supplied timeval may not be negative and should be normalized. A
553 * return value of 0 is possible if the timeval converts to less then
556 * If ints have 32 bits, then the maximum value for any timeout in
557 * 10ms ticks is 248 days.
560 tvtohz_low(struct timeval *tv)
566 if (sec <= INT_MAX / hz)
567 ticks = (int)(sec * hz + (u_long)tv->tv_usec / tick);
575 * Start profiling on a process.
577 * Kernel profiling passes proc0 which never exits and hence
578 * keeps the profile clock running constantly.
581 startprofclock(struct proc *p)
583 if ((p->p_flag & P_PROFIL) == 0) {
584 p->p_flag |= P_PROFIL;
586 if (++profprocs == 1 && stathz != 0) {
589 setstatclockrate(profhz);
597 * Stop profiling on a process.
600 stopprofclock(struct proc *p)
602 if (p->p_flag & P_PROFIL) {
603 p->p_flag &= ~P_PROFIL;
605 if (--profprocs == 0 && stathz != 0) {
608 setstatclockrate(stathz);
616 * Return information about system clocks.
619 sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
621 struct clockinfo clkinfo;
623 * Construct clockinfo structure.
627 clkinfo.tickadj = tickadj;
628 clkinfo.profhz = profhz;
629 clkinfo.stathz = stathz ? stathz : hz;
630 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req));
633 SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
634 0, 0, sysctl_kern_clockrate, "S,clockinfo","");
637 * We have eight functions for looking at the clock, four for
638 * microseconds and four for nanoseconds. For each there is fast
639 * but less precise version "get{nano|micro}[up]time" which will
640 * return a time which is up to 1/HZ previous to the call, whereas
641 * the raw version "{nano|micro}[up]time" will return a timestamp
642 * which is as precise as possible. The "up" variants return the
643 * time relative to system boot, these are well suited for time
644 * interval measurements.
646 * Each cpu independantly maintains the current time of day, so all
647 * we need to do to protect ourselves from changes is to do a loop
648 * check on the seconds field changing out from under us.
651 getmicrouptime(struct timeval *tvp)
653 struct globaldata *gd = mycpu;
657 tvp->tv_sec = gd->gd_time_seconds;
658 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
659 } while (tvp->tv_sec != gd->gd_time_seconds);
660 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32;
661 if (tvp->tv_usec >= 1000000) {
662 tvp->tv_usec -= 1000000;
668 getnanouptime(struct timespec *tsp)
670 struct globaldata *gd = mycpu;
674 tsp->tv_sec = gd->gd_time_seconds;
675 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
676 } while (tsp->tv_sec != gd->gd_time_seconds);
677 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
678 if (tsp->tv_nsec >= 1000000000) {
679 tsp->tv_nsec -= 1000000000;
685 microuptime(struct timeval *tvp)
687 struct globaldata *gd = mycpu;
691 tvp->tv_sec = gd->gd_time_seconds;
692 delta = cputimer_count() - gd->gd_cpuclock_base;
693 } while (tvp->tv_sec != gd->gd_time_seconds);
694 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32;
695 if (tvp->tv_usec >= 1000000) {
696 tvp->tv_usec -= 1000000;
702 nanouptime(struct timespec *tsp)
704 struct globaldata *gd = mycpu;
708 tsp->tv_sec = gd->gd_time_seconds;
709 delta = cputimer_count() - gd->gd_cpuclock_base;
710 } while (tsp->tv_sec != gd->gd_time_seconds);
711 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
712 if (tsp->tv_nsec >= 1000000000) {
713 tsp->tv_nsec -= 1000000000;
723 getmicrotime(struct timeval *tvp)
725 struct globaldata *gd = mycpu;
729 tvp->tv_sec = gd->gd_time_seconds;
730 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
731 } while (tvp->tv_sec != gd->gd_time_seconds);
732 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32;
734 tvp->tv_sec += basetime.tv_sec;
735 tvp->tv_usec += basetime.tv_nsec / 1000;
736 while (tvp->tv_usec >= 1000000) {
737 tvp->tv_usec -= 1000000;
743 getnanotime(struct timespec *tsp)
745 struct globaldata *gd = mycpu;
749 tsp->tv_sec = gd->gd_time_seconds;
750 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
751 } while (tsp->tv_sec != gd->gd_time_seconds);
752 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
754 tsp->tv_sec += basetime.tv_sec;
755 tsp->tv_nsec += basetime.tv_nsec;
756 while (tsp->tv_nsec >= 1000000000) {
757 tsp->tv_nsec -= 1000000000;
763 microtime(struct timeval *tvp)
765 struct globaldata *gd = mycpu;
769 tvp->tv_sec = gd->gd_time_seconds;
770 delta = cputimer_count() - gd->gd_cpuclock_base;
771 } while (tvp->tv_sec != gd->gd_time_seconds);
772 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32;
774 tvp->tv_sec += basetime.tv_sec;
775 tvp->tv_usec += basetime.tv_nsec / 1000;
776 while (tvp->tv_usec >= 1000000) {
777 tvp->tv_usec -= 1000000;
783 nanotime(struct timespec *tsp)
785 struct globaldata *gd = mycpu;
789 tsp->tv_sec = gd->gd_time_seconds;
790 delta = cputimer_count() - gd->gd_cpuclock_base;
791 } while (tsp->tv_sec != gd->gd_time_seconds);
792 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
794 tsp->tv_sec += basetime.tv_sec;
795 tsp->tv_nsec += basetime.tv_nsec;
796 while (tsp->tv_nsec >= 1000000000) {
797 tsp->tv_nsec -= 1000000000;
803 pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps)
806 struct pps_fetch_args *fapi;
808 struct pps_kcbind_args *kapi;
814 case PPS_IOC_DESTROY:
816 case PPS_IOC_SETPARAMS:
817 app = (pps_params_t *)data;
818 if (app->mode & ~pps->ppscap)
820 pps->ppsparam = *app;
822 case PPS_IOC_GETPARAMS:
823 app = (pps_params_t *)data;
824 *app = pps->ppsparam;
825 app->api_version = PPS_API_VERS_1;
828 *(int*)data = pps->ppscap;
831 fapi = (struct pps_fetch_args *)data;
832 if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC)
834 if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec)
836 pps->ppsinfo.current_mode = pps->ppsparam.mode;
837 fapi->pps_info_buf = pps->ppsinfo;
841 kapi = (struct pps_kcbind_args *)data;
842 /* XXX Only root should be able to do this */
843 if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC)
845 if (kapi->kernel_consumer != PPS_KC_HARDPPS)
847 if (kapi->edge & ~pps->ppscap)
849 pps->kcmode = kapi->edge;
860 pps_init(struct pps_state *pps)
862 pps->ppscap |= PPS_TSFMT_TSPEC;
863 if (pps->ppscap & PPS_CAPTUREASSERT)
864 pps->ppscap |= PPS_OFFSETASSERT;
865 if (pps->ppscap & PPS_CAPTURECLEAR)
866 pps->ppscap |= PPS_OFFSETCLEAR;
870 pps_event(struct pps_state *pps, sysclock_t count, int event)
872 struct globaldata *gd;
873 struct timespec *tsp;
874 struct timespec *osp;
887 /* Things would be easier with arrays... */
888 if (event == PPS_CAPTUREASSERT) {
889 tsp = &pps->ppsinfo.assert_timestamp;
890 osp = &pps->ppsparam.assert_offset;
891 foff = pps->ppsparam.mode & PPS_OFFSETASSERT;
892 fhard = pps->kcmode & PPS_CAPTUREASSERT;
893 pcount = &pps->ppscount[0];
894 pseq = &pps->ppsinfo.assert_sequence;
896 tsp = &pps->ppsinfo.clear_timestamp;
897 osp = &pps->ppsparam.clear_offset;
898 foff = pps->ppsparam.mode & PPS_OFFSETCLEAR;
899 fhard = pps->kcmode & PPS_CAPTURECLEAR;
900 pcount = &pps->ppscount[1];
901 pseq = &pps->ppsinfo.clear_sequence;
904 /* Nothing really happened */
905 if (*pcount == count)
911 ts.tv_sec = gd->gd_time_seconds;
912 delta = count - gd->gd_cpuclock_base;
913 } while (ts.tv_sec != gd->gd_time_seconds);
914 if (delta > cputimer_freq) {
915 ts.tv_sec += delta / cputimer_freq;
916 delta %= cputimer_freq;
918 ts.tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
919 ts.tv_sec += basetime.tv_sec;
920 ts.tv_nsec += basetime.tv_nsec;
921 while (ts.tv_nsec >= 1000000000) {
922 ts.tv_nsec -= 1000000000;
930 timespecadd(tsp, osp);
931 if (tsp->tv_nsec < 0) {
932 tsp->tv_nsec += 1000000000;
938 /* magic, at its best... */
939 tcount = count - pps->ppscount[2];
940 pps->ppscount[2] = count;
941 delta = (cputimer_freq64_nsec * tcount) >> 32;