Always use SYSCTL_OUT, sysctl doesn't print the value otherwise.
[dragonfly.git] / sys / kern / kern_clock.c
CommitLineData
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1/*
2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
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
16 * distribution.
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.
20 *
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
32 * SUCH DAMAGE.
33 *
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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.
42 *
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
45 * are met:
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.
58 *
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
69 * SUCH DAMAGE.
70 *
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 $
5d1a8afc 73 * $DragonFly: src/sys/kern/kern_clock.c,v 1.36 2005/04/20 17:57:16 joerg Exp $
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74 */
75
76#include "opt_ntp.h"
77
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>
f5d21610 83#include <sys/kinfo.h>
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84#include <sys/proc.h>
85#include <sys/malloc.h>
86#include <sys/resourcevar.h>
87#include <sys/signalvar.h>
88#include <sys/timex.h>
89#include <sys/timepps.h>
90#include <vm/vm.h>
91#include <sys/lock.h>
92#include <vm/pmap.h>
93#include <vm/vm_map.h>
94#include <sys/sysctl.h>
2689779e 95#include <sys/thread2.h>
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96
97#include <machine/cpu.h>
98#include <machine/limits.h>
99#include <machine/smp.h>
100
101#ifdef GPROF
102#include <sys/gmon.h>
103#endif
104
105#ifdef DEVICE_POLLING
106extern void init_device_poll(void);
107extern void hardclock_device_poll(void);
108#endif /* DEVICE_POLLING */
109
402ed7e1 110static void initclocks (void *dummy);
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111SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL)
112
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113/*
114 * Some of these don't belong here, but it's easiest to concentrate them.
f5d21610 115 * Note that cp_time counts in microseconds, but most userland programs
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116 * just compare relative times against the total by delta.
117 */
f5d21610 118struct cp_time cp_time;
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119
120SYSCTL_OPAQUE(_kern, OID_AUTO, cp_time, CTLFLAG_RD, &cp_time, sizeof(cp_time),
121 "LU", "CPU time statistics");
122
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123/*
124 * boottime is used to calculate the 'real' uptime. Do not confuse this with
125 * microuptime(). microtime() is not drift compensated. The real uptime
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126 * with compensation is nanotime() - bootime. boottime is recalculated
127 * whenever the real time is set based on the compensated elapsed time
128 * in seconds (gd->gd_time_seconds).
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129 *
130 * basetime is used to calculate the compensated real time of day. Chunky
131 * changes to the time, aka settimeofday(), are made by modifying basetime.
132 *
133 * The gd_time_seconds and gd_cpuclock_base fields remain fairly monotonic.
134 * Slight adjustments to gd_cpuclock_base are made to phase-lock it to
135 * the real time.
136 */
137struct timespec boottime; /* boot time (realtime) for reference only */
5d1a8afc 138static struct timespec basetime; /* base time adjusts uptime -> realtime */
88c4d2f6 139time_t time_second; /* read-only 'passive' uptime in seconds */
984263bc 140
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141SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD,
142 &boottime, timeval, "System boottime");
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143SYSCTL_STRUCT(_kern, OID_AUTO, basetime, CTLFLAG_RD,
144 &basetime, timeval, "System basetime");
984263bc 145
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146static void hardclock(systimer_t info, struct intrframe *frame);
147static void statclock(systimer_t info, struct intrframe *frame);
148static void schedclock(systimer_t info, struct intrframe *frame);
149
150int ticks; /* system master ticks at hz */
da3639ef 151int clocks_running; /* tsleep/timeout clocks operational */
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152int64_t nsec_adj; /* ntpd per-tick adjustment in nsec << 32 */
153int64_t nsec_acc; /* accumulator */
984263bc 154
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155/* NTPD time correction fields */
156int64_t ntp_tick_permanent; /* per-tick adjustment in nsec << 32 */
157int64_t ntp_tick_acc; /* accumulator for per-tick adjustment */
158int64_t ntp_delta; /* one-time correction in nsec */
159int64_t ntp_big_delta = 1000000000;
160int32_t ntp_tick_delta; /* current adjustment rate */
161int32_t ntp_default_tick_delta; /* adjustment rate for ntp_delta */
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162time_t ntp_leap_second; /* time of next leap second */
163int ntp_leap_insert; /* whether to insert or remove a second */
4026c000 164
984263bc 165/*
88c4d2f6 166 * Finish initializing clock frequencies and start all clocks running.
984263bc 167 */
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168/* ARGSUSED*/
169static void
170initclocks(void *dummy)
984263bc 171{
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172 cpu_initclocks();
173#ifdef DEVICE_POLLING
174 init_device_poll();
175#endif
176 /*psratio = profhz / stathz;*/
177 initclocks_pcpu();
da3639ef 178 clocks_running = 1;
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179}
180
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181/*
182 * Called on a per-cpu basis
183 */
184void
185initclocks_pcpu(void)
186{
187 struct globaldata *gd = mycpu;
984263bc 188
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189 crit_enter();
190 if (gd->gd_cpuid == 0) {
191 gd->gd_time_seconds = 1;
192 gd->gd_cpuclock_base = cputimer_count();
193 } else {
194 /* XXX */
195 gd->gd_time_seconds = globaldata_find(0)->gd_time_seconds;
196 gd->gd_cpuclock_base = globaldata_find(0)->gd_cpuclock_base;
197 }
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198
199 /*
200 * Use a non-queued periodic systimer to prevent multiple ticks from
201 * building up if the sysclock jumps forward (8254 gets reset). The
202 * sysclock will never jump backwards. Our time sync is based on
203 * the actual sysclock, not the ticks count.
204 */
205 systimer_init_periodic_nq(&gd->gd_hardclock, hardclock, NULL, hz);
206 systimer_init_periodic_nq(&gd->gd_statclock, statclock, NULL, stathz);
88c4d2f6 207 /* XXX correct the frequency for scheduler / estcpu tests */
0d1dffdf 208 systimer_init_periodic_nq(&gd->gd_schedclock, schedclock,
8478264a 209 NULL, ESTCPUFREQ);
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210 crit_exit();
211}
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212
213/*
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214 * This sets the current real time of day. Timespecs are in seconds and
215 * nanoseconds. We do not mess with gd_time_seconds and gd_cpuclock_base,
216 * instead we adjust basetime so basetime + gd_* results in the current
217 * time of day. This way the gd_* fields are guarenteed to represent
218 * a monotonically increasing 'uptime' value.
984263bc 219 */
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220void
221set_timeofday(struct timespec *ts)
222{
223 struct timespec ts2;
984263bc 224
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225 /*
226 * XXX SMP / non-atomic basetime updates
227 */
228 crit_enter();
229 nanouptime(&ts2);
230 basetime.tv_sec = ts->tv_sec - ts2.tv_sec;
231 basetime.tv_nsec = ts->tv_nsec - ts2.tv_nsec;
232 if (basetime.tv_nsec < 0) {
233 basetime.tv_nsec += 1000000000;
234 --basetime.tv_sec;
235 }
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236
237 /*
238 * Note that basetime diverges from boottime as the clock drift is
239 * compensated for, so we cannot do away with boottime. When setting
240 * the absolute time of day the drift is 0 (for an instant) and we
241 * can simply assign boottime to basetime.
242 *
243 * Note that nanouptime() is based on gd_time_seconds which is drift
244 * compensated up to a point (it is guarenteed to remain monotonically
245 * increasing). gd_time_seconds is thus our best uptime guess and
246 * suitable for use in the boottime calculation. It is already taken
247 * into account in the basetime calculation above.
248 */
249 boottime.tv_sec = basetime.tv_sec;
4026c000 250 ntp_delta = 0;
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251 crit_exit();
252}
253
984263bc 254/*
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255 * Each cpu has its own hardclock, but we only increments ticks and softticks
256 * on cpu #0.
257 *
258 * NOTE! systimer! the MP lock might not be held here. We can only safely
259 * manipulate objects owned by the current cpu.
984263bc 260 */
984263bc 261static void
88c4d2f6 262hardclock(systimer_t info, struct intrframe *frame)
984263bc 263{
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264 sysclock_t cputicks;
265 struct proc *p;
266 struct pstats *pstats;
267 struct globaldata *gd = mycpu;
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268
269 /*
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270 * Realtime updates are per-cpu. Note that timer corrections as
271 * returned by microtime() and friends make an additional adjustment
272 * using a system-wise 'basetime', but the running time is always
273 * taken from the per-cpu globaldata area. Since the same clock
274 * is distributing (XXX SMP) to all cpus, the per-cpu timebases
275 * stay in synch.
276 *
277 * Note that we never allow info->time (aka gd->gd_hardclock.time)
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278 * to reverse index gd_cpuclock_base, but that it is possible for
279 * it to temporarily get behind in the seconds if something in the
280 * system locks interrupts for a long period of time. Since periodic
281 * timers count events, though everything should resynch again
282 * immediately.
984263bc 283 */
88c4d2f6 284 cputicks = info->time - gd->gd_cpuclock_base;
fad57d0e 285 if (cputicks >= cputimer_freq) {
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286 ++gd->gd_time_seconds;
287 gd->gd_cpuclock_base += cputimer_freq;
288 }
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289
290 /*
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291 * The system-wide ticks counter and NTP related timedelta/tickdelta
292 * adjustments only occur on cpu #0. NTP adjustments are accomplished
293 * by updating basetime.
984263bc 294 */
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295 if (gd->gd_cpuid == 0) {
296 struct timespec nts;
297 int leap;
984263bc 298
88c4d2f6 299 ++ticks;
984263bc 300
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301#ifdef DEVICE_POLLING
302 hardclock_device_poll(); /* mpsafe, short and quick */
303#endif /* DEVICE_POLLING */
984263bc 304
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305#if 0
306 if (tco->tc_poll_pps)
307 tco->tc_poll_pps(tco);
308#endif
309 /*
310 * Apply adjtime corrections. At the moment only do this if
311 * we can get the MP lock to interlock with adjtime's modification
312 * of these variables. Note that basetime adjustments are not
313 * MP safe either XXX.
314 */
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315 if (ntp_delta != 0) {
316 basetime.tv_nsec += ntp_tick_delta;
317 ntp_delta -= ntp_tick_delta;
318 if ((ntp_delta > 0 && ntp_delta < ntp_tick_delta) ||
319 (ntp_delta < 0 && ntp_delta > ntp_tick_delta)) {
320 ntp_tick_delta = ntp_delta;
321 }
322 }
323
324 if (ntp_tick_permanent != 0) {
325 ntp_tick_acc += ntp_tick_permanent;
326 if (ntp_tick_acc >= (1LL << 32)) {
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327 basetime.tv_nsec += ntp_tick_acc >> 32;
328 ntp_tick_acc -= (ntp_tick_acc >> 32) << 32;
4026c000 329 } else if (ntp_tick_acc <= -(1LL << 32)) {
331bc6f8 330 /* Negate ntp_tick_acc to avoid shifting the sign bit. */
4026c000 331 basetime.tv_nsec -= (-ntp_tick_acc) >> 32;
331bc6f8 332 ntp_tick_acc += ((-ntp_tick_acc) >> 32) << 32;
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333 }
334 }
335
336 if (basetime.tv_nsec >= 1000000000) {
337 basetime.tv_sec++;
88c4d2f6 338 basetime.tv_nsec -= 1000000000;
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339 } else if (basetime.tv_nsec < 0) {
340 basetime.tv_sec--;
88c4d2f6 341 basetime.tv_nsec += 1000000000;
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342 }
343
48590578 344 if (ntp_leap_second) {
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345 struct timespec tsp;
346 nanotime(&tsp);
347
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348 if (ntp_leap_second == tsp.tv_sec) {
349 if (ntp_leap_insert)
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350 basetime.tv_sec++;
351 else
352 basetime.tv_sec--;
48590578 353 ntp_leap_second--;
88c4d2f6 354 }
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355 }
356
357 /*
358 * Apply per-tick compensation. ticks_adj adjusts for both
359 * offset and frequency, and could be negative.
360 */
361 if (nsec_adj != 0 && try_mplock()) {
362 nsec_acc += nsec_adj;
363 if (nsec_acc >= 0x100000000LL) {
364 basetime.tv_nsec += nsec_acc >> 32;
365 nsec_acc = (nsec_acc & 0xFFFFFFFFLL);
366 } else if (nsec_acc <= -0x100000000LL) {
367 basetime.tv_nsec -= -nsec_acc >> 32;
368 nsec_acc = -(-nsec_acc & 0xFFFFFFFFLL);
369 }
370 if (basetime.tv_nsec >= 1000000000) {
371 basetime.tv_nsec -= 1000000000;
372 ++basetime.tv_sec;
373 } else if (basetime.tv_nsec < 0) {
374 basetime.tv_nsec += 1000000000;
375 --basetime.tv_sec;
376 }
377 rel_mplock();
378 }
379
380 /*
381 * If the realtime-adjusted seconds hand rolls over then tell
382 * ntp_update_second() what we did in the last second so it can
383 * calculate what to do in the next second. It may also add
384 * or subtract a leap second.
385 */
386 getnanotime(&nts);
387 if (time_second != nts.tv_sec) {
388 leap = ntp_update_second(time_second, &nsec_adj);
389 basetime.tv_sec += leap;
390 time_second = nts.tv_sec + leap;
391 nsec_adj /= hz;
392 }
393 }
394
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395 /*
396 * softticks are handled for all cpus
397 */
398 hardclock_softtick(gd);
399
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400 /*
401 * ITimer handling is per-tick, per-cpu. I don't think psignal()
402 * is mpsafe on curproc, so XXX get the mplock.
403 */
404 if ((p = curproc) != NULL && try_mplock()) {
984263bc 405 pstats = p->p_stats;
88c4d2f6 406 if (frame && CLKF_USERMODE(frame) &&
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407 timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) &&
408 itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0)
409 psignal(p, SIGVTALRM);
410 if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value) &&
411 itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0)
412 psignal(p, SIGPROF);
88c4d2f6 413 rel_mplock();
984263bc 414 }
604e1e09 415 setdelayed();
88c4d2f6 416}
984263bc 417
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418/*
419 * The statistics clock typically runs at a 125Hz rate, and is intended
420 * to be frequency offset from the hardclock (typ 100Hz). It is per-cpu.
421 *
422 * NOTE! systimer! the MP lock might not be held here. We can only safely
423 * manipulate objects owned by the current cpu.
424 *
425 * The stats clock is responsible for grabbing a profiling sample.
426 * Most of the statistics are only used by user-level statistics programs.
427 * The main exceptions are p->p_uticks, p->p_sticks, p->p_iticks, and
428 * p->p_estcpu.
429 *
430 * Like the other clocks, the stat clock is called from what is effectively
431 * a fast interrupt, so the context should be the thread/process that got
432 * interrupted.
433 */
434static void
435statclock(systimer_t info, struct intrframe *frame)
436{
437#ifdef GPROF
438 struct gmonparam *g;
439 int i;
984263bc 440#endif
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441 thread_t td;
442 struct proc *p;
443 int bump;
444 struct timeval tv;
445 struct timeval *stv;
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446
447 /*
88c4d2f6 448 * How big was our timeslice relative to the last time?
984263bc 449 */
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450 microuptime(&tv); /* mpsafe */
451 stv = &mycpu->gd_stattv;
452 if (stv->tv_sec == 0) {
453 bump = 1;
454 } else {
455 bump = tv.tv_usec - stv->tv_usec +
456 (tv.tv_sec - stv->tv_sec) * 1000000;
457 if (bump < 0)
458 bump = 0;
459 if (bump > 1000000)
460 bump = 1000000;
461 }
462 *stv = tv;
984263bc 463
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464 td = curthread;
465 p = td->td_proc;
984263bc 466
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467 if (frame && CLKF_USERMODE(frame)) {
468 /*
469 * Came from userland, handle user time and deal with
470 * possible process.
471 */
472 if (p && (p->p_flag & P_PROFIL))
473 addupc_intr(p, CLKF_PC(frame), 1);
474 td->td_uticks += bump;
984263bc 475
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476 /*
477 * Charge the time as appropriate
478 */
479 if (p && p->p_nice > NZERO)
f5d21610 480 cp_time.cp_nice += bump;
88c4d2f6 481 else
f5d21610 482 cp_time.cp_user += bump;
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483 } else {
484#ifdef GPROF
485 /*
486 * Kernel statistics are just like addupc_intr, only easier.
487 */
488 g = &_gmonparam;
489 if (g->state == GMON_PROF_ON && frame) {
490 i = CLKF_PC(frame) - g->lowpc;
491 if (i < g->textsize) {
492 i /= HISTFRACTION * sizeof(*g->kcount);
493 g->kcount[i]++;
494 }
495 }
496#endif
497 /*
498 * Came from kernel mode, so we were:
499 * - handling an interrupt,
500 * - doing syscall or trap work on behalf of the current
501 * user process, or
502 * - spinning in the idle loop.
503 * Whichever it is, charge the time as appropriate.
504 * Note that we charge interrupts to the current process,
505 * regardless of whether they are ``for'' that process,
506 * so that we know how much of its real time was spent
507 * in ``non-process'' (i.e., interrupt) work.
508 *
509 * XXX assume system if frame is NULL. A NULL frame
510 * can occur if ipi processing is done from an splx().
511 */
512 if (frame && CLKF_INTR(frame))
513 td->td_iticks += bump;
514 else
515 td->td_sticks += bump;
516
517 if (frame && CLKF_INTR(frame)) {
f5d21610 518 cp_time.cp_intr += bump;
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519 } else {
520 if (td == &mycpu->gd_idlethread)
f5d21610 521 cp_time.cp_idle += bump;
88c4d2f6 522 else
f5d21610 523 cp_time.cp_sys += bump;
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524 }
525 }
526}
527
528/*
0a3f9b47 529 * The scheduler clock typically runs at a 20Hz rate. NOTE! systimer,
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530 * the MP lock might not be held. We can safely manipulate parts of curproc
531 * but that's about it.
532 */
533static void
534schedclock(systimer_t info, struct intrframe *frame)
535{
536 struct proc *p;
537 struct pstats *pstats;
538 struct rusage *ru;
539 struct vmspace *vm;
540 long rss;
541
542 schedulerclock(NULL); /* mpsafe */
543 if ((p = curproc) != NULL) {
544 /* Update resource usage integrals and maximums. */
545 if ((pstats = p->p_stats) != NULL &&
546 (ru = &pstats->p_ru) != NULL &&
547 (vm = p->p_vmspace) != NULL) {
548 ru->ru_ixrss += pgtok(vm->vm_tsize);
549 ru->ru_idrss += pgtok(vm->vm_dsize);
550 ru->ru_isrss += pgtok(vm->vm_ssize);
551 rss = pgtok(vmspace_resident_count(vm));
552 if (ru->ru_maxrss < rss)
553 ru->ru_maxrss = rss;
554 }
b68b7282 555 }
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556}
557
558/*
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559 * Compute number of ticks for the specified amount of time. The
560 * return value is intended to be used in a clock interrupt timed
561 * operation and guarenteed to meet or exceed the requested time.
562 * If the representation overflows, return INT_MAX. The minimum return
563 * value is 1 ticks and the function will average the calculation up.
564 * If any value greater then 0 microseconds is supplied, a value
565 * of at least 2 will be returned to ensure that a near-term clock
566 * interrupt does not cause the timeout to occur (degenerately) early.
567 *
568 * Note that limit checks must take into account microseconds, which is
569 * done simply by using the smaller signed long maximum instead of
570 * the unsigned long maximum.
571 *
572 * If ints have 32 bits, then the maximum value for any timeout in
573 * 10ms ticks is 248 days.
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574 */
575int
a94976ad 576tvtohz_high(struct timeval *tv)
984263bc 577{
a94976ad 578 int ticks;
1fd87d54 579 long sec, usec;
984263bc 580
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MD
581 sec = tv->tv_sec;
582 usec = tv->tv_usec;
583 if (usec < 0) {
584 sec--;
585 usec += 1000000;
586 }
587 if (sec < 0) {
588#ifdef DIAGNOSTIC
589 if (usec > 0) {
590 sec++;
591 usec -= 1000000;
592 }
593 printf("tvotohz: negative time difference %ld sec %ld usec\n",
594 sec, usec);
595#endif
596 ticks = 1;
a94976ad
MD
597 } else if (sec <= INT_MAX / hz) {
598 ticks = (int)(sec * hz +
599 ((u_long)usec + (tick - 1)) / tick) + 1;
600 } else {
601 ticks = INT_MAX;
602 }
603 return (ticks);
604}
605
606/*
607 * Compute number of ticks for the specified amount of time, erroring on
608 * the side of it being too low to ensure that sleeping the returned number
609 * of ticks will not result in a late return.
610 *
611 * The supplied timeval may not be negative and should be normalized. A
612 * return value of 0 is possible if the timeval converts to less then
613 * 1 tick.
614 *
615 * If ints have 32 bits, then the maximum value for any timeout in
616 * 10ms ticks is 248 days.
617 */
618int
619tvtohz_low(struct timeval *tv)
620{
621 int ticks;
622 long sec;
623
624 sec = tv->tv_sec;
625 if (sec <= INT_MAX / hz)
626 ticks = (int)(sec * hz + (u_long)tv->tv_usec / tick);
984263bc 627 else
984263bc 628 ticks = INT_MAX;
a94976ad 629 return (ticks);
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MD
630}
631
a94976ad 632
984263bc
MD
633/*
634 * Start profiling on a process.
635 *
636 * Kernel profiling passes proc0 which never exits and hence
637 * keeps the profile clock running constantly.
638 */
639void
88c4d2f6 640startprofclock(struct proc *p)
984263bc 641{
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MD
642 if ((p->p_flag & P_PROFIL) == 0) {
643 p->p_flag |= P_PROFIL;
88c4d2f6 644#if 0 /* XXX */
984263bc
MD
645 if (++profprocs == 1 && stathz != 0) {
646 s = splstatclock();
6ad39cae 647 psdiv = psratio;
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648 setstatclockrate(profhz);
649 splx(s);
650 }
88c4d2f6 651#endif
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MD
652 }
653}
654
655/*
656 * Stop profiling on a process.
657 */
658void
88c4d2f6 659stopprofclock(struct proc *p)
984263bc 660{
984263bc
MD
661 if (p->p_flag & P_PROFIL) {
662 p->p_flag &= ~P_PROFIL;
88c4d2f6 663#if 0 /* XXX */
984263bc
MD
664 if (--profprocs == 0 && stathz != 0) {
665 s = splstatclock();
6ad39cae 666 psdiv = 1;
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667 setstatclockrate(stathz);
668 splx(s);
669 }
984263bc 670#endif
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MD
671 }
672}
673
674/*
675 * Return information about system clocks.
676 */
677static int
678sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
679{
f5d21610 680 struct kinfo_clockinfo clkinfo;
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681 /*
682 * Construct clockinfo structure.
683 */
f5d21610
JS
684 clkinfo.ci_hz = hz;
685 clkinfo.ci_tick = tick;
4026c000 686 clkinfo.ci_tickadj = ntp_default_tick_delta / 1000;
f5d21610
JS
687 clkinfo.ci_profhz = profhz;
688 clkinfo.ci_stathz = stathz ? stathz : hz;
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MD
689 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req));
690}
691
692SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
693 0, 0, sysctl_kern_clockrate, "S,clockinfo","");
694
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MD
695/*
696 * We have eight functions for looking at the clock, four for
697 * microseconds and four for nanoseconds. For each there is fast
698 * but less precise version "get{nano|micro}[up]time" which will
699 * return a time which is up to 1/HZ previous to the call, whereas
700 * the raw version "{nano|micro}[up]time" will return a timestamp
701 * which is as precise as possible. The "up" variants return the
702 * time relative to system boot, these are well suited for time
703 * interval measurements.
88c4d2f6
MD
704 *
705 * Each cpu independantly maintains the current time of day, so all
706 * we need to do to protect ourselves from changes is to do a loop
707 * check on the seconds field changing out from under us.
fad57d0e
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708 *
709 * The system timer maintains a 32 bit count and due to various issues
710 * it is possible for the calculated delta to occassionally exceed
711 * cputimer_freq. If this occurs the cputimer_freq64_nsec multiplication
712 * can easily overflow, so we deal with the case. For uniformity we deal
713 * with the case in the usec case too.
984263bc 714 */
984263bc
MD
715void
716getmicrouptime(struct timeval *tvp)
717{
88c4d2f6
MD
718 struct globaldata *gd = mycpu;
719 sysclock_t delta;
720
721 do {
722 tvp->tv_sec = gd->gd_time_seconds;
723 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
724 } while (tvp->tv_sec != gd->gd_time_seconds);
fad57d0e
MD
725
726 if (delta >= cputimer_freq) {
727 tvp->tv_sec += delta / cputimer_freq;
728 delta %= cputimer_freq;
729 }
88c4d2f6
MD
730 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32;
731 if (tvp->tv_usec >= 1000000) {
732 tvp->tv_usec -= 1000000;
733 ++tvp->tv_sec;
984263bc
MD
734 }
735}
736
737void
738getnanouptime(struct timespec *tsp)
739{
88c4d2f6
MD
740 struct globaldata *gd = mycpu;
741 sysclock_t delta;
742
743 do {
744 tsp->tv_sec = gd->gd_time_seconds;
745 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
746 } while (tsp->tv_sec != gd->gd_time_seconds);
fad57d0e
MD
747
748 if (delta >= cputimer_freq) {
749 tsp->tv_sec += delta / cputimer_freq;
750 delta %= cputimer_freq;
984263bc 751 }
fad57d0e 752 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
984263bc
MD
753}
754
755void
88c4d2f6 756microuptime(struct timeval *tvp)
984263bc 757{
88c4d2f6
MD
758 struct globaldata *gd = mycpu;
759 sysclock_t delta;
760
761 do {
762 tvp->tv_sec = gd->gd_time_seconds;
763 delta = cputimer_count() - gd->gd_cpuclock_base;
764 } while (tvp->tv_sec != gd->gd_time_seconds);
fad57d0e
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765
766 if (delta >= cputimer_freq) {
767 tvp->tv_sec += delta / cputimer_freq;
768 delta %= cputimer_freq;
984263bc 769 }
fad57d0e 770 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32;
984263bc
MD
771}
772
773void
88c4d2f6 774nanouptime(struct timespec *tsp)
984263bc 775{
88c4d2f6
MD
776 struct globaldata *gd = mycpu;
777 sysclock_t delta;
778
779 do {
780 tsp->tv_sec = gd->gd_time_seconds;
781 delta = cputimer_count() - gd->gd_cpuclock_base;
782 } while (tsp->tv_sec != gd->gd_time_seconds);
fad57d0e
MD
783
784 if (delta >= cputimer_freq) {
785 tsp->tv_sec += delta / cputimer_freq;
786 delta %= cputimer_freq;
984263bc 787 }
fad57d0e 788 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
984263bc
MD
789}
790
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791/*
792 * realtime routines
793 */
984263bc
MD
794
795void
88c4d2f6 796getmicrotime(struct timeval *tvp)
984263bc 797{
88c4d2f6
MD
798 struct globaldata *gd = mycpu;
799 sysclock_t delta;
984263bc 800
88c4d2f6
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801 do {
802 tvp->tv_sec = gd->gd_time_seconds;
803 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
804 } while (tvp->tv_sec != gd->gd_time_seconds);
fad57d0e
MD
805
806 if (delta >= cputimer_freq) {
807 tvp->tv_sec += delta / cputimer_freq;
808 delta %= cputimer_freq;
809 }
88c4d2f6 810 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32;
984263bc 811
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MD
812 tvp->tv_sec += basetime.tv_sec;
813 tvp->tv_usec += basetime.tv_nsec / 1000;
814 while (tvp->tv_usec >= 1000000) {
815 tvp->tv_usec -= 1000000;
816 ++tvp->tv_sec;
984263bc 817 }
984263bc
MD
818}
819
820void
88c4d2f6 821getnanotime(struct timespec *tsp)
984263bc 822{
88c4d2f6
MD
823 struct globaldata *gd = mycpu;
824 sysclock_t delta;
984263bc 825
88c4d2f6
MD
826 do {
827 tsp->tv_sec = gd->gd_time_seconds;
828 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
829 } while (tsp->tv_sec != gd->gd_time_seconds);
fad57d0e
MD
830
831 if (delta >= cputimer_freq) {
832 tsp->tv_sec += delta / cputimer_freq;
833 delta %= cputimer_freq;
834 }
88c4d2f6 835 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
984263bc 836
88c4d2f6
MD
837 tsp->tv_sec += basetime.tv_sec;
838 tsp->tv_nsec += basetime.tv_nsec;
839 while (tsp->tv_nsec >= 1000000000) {
840 tsp->tv_nsec -= 1000000000;
841 ++tsp->tv_sec;
984263bc 842 }
984263bc
MD
843}
844
88c4d2f6
MD
845void
846microtime(struct timeval *tvp)
984263bc 847{
88c4d2f6
MD
848 struct globaldata *gd = mycpu;
849 sysclock_t delta;
984263bc 850
88c4d2f6
MD
851 do {
852 tvp->tv_sec = gd->gd_time_seconds;
853 delta = cputimer_count() - gd->gd_cpuclock_base;
854 } while (tvp->tv_sec != gd->gd_time_seconds);
fad57d0e
MD
855
856 if (delta >= cputimer_freq) {
857 tvp->tv_sec += delta / cputimer_freq;
858 delta %= cputimer_freq;
859 }
88c4d2f6 860 tvp->tv_usec = (cputimer_freq64_usec * delta) >> 32;
984263bc 861
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MD
862 tvp->tv_sec += basetime.tv_sec;
863 tvp->tv_usec += basetime.tv_nsec / 1000;
864 while (tvp->tv_usec >= 1000000) {
865 tvp->tv_usec -= 1000000;
866 ++tvp->tv_sec;
984263bc 867 }
984263bc
MD
868}
869
88c4d2f6
MD
870void
871nanotime(struct timespec *tsp)
872{
873 struct globaldata *gd = mycpu;
874 sysclock_t delta;
984263bc 875
88c4d2f6
MD
876 do {
877 tsp->tv_sec = gd->gd_time_seconds;
878 delta = cputimer_count() - gd->gd_cpuclock_base;
879 } while (tsp->tv_sec != gd->gd_time_seconds);
fad57d0e
MD
880
881 if (delta >= cputimer_freq) {
882 tsp->tv_sec += delta / cputimer_freq;
883 delta %= cputimer_freq;
884 }
88c4d2f6 885 tsp->tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
984263bc 886
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MD
887 tsp->tv_sec += basetime.tv_sec;
888 tsp->tv_nsec += basetime.tv_nsec;
889 while (tsp->tv_nsec >= 1000000000) {
890 tsp->tv_nsec -= 1000000000;
891 ++tsp->tv_sec;
984263bc 892 }
984263bc
MD
893}
894
25b804e7
MD
895/*
896 * note: this is not exactly synchronized with real time. To do that we
897 * would have to do what microtime does and check for a nanoseconds overflow.
898 */
899time_t
900get_approximate_time_t(void)
901{
902 struct globaldata *gd = mycpu;
903 return(gd->gd_time_seconds + basetime.tv_sec);
904}
905
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906int
907pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps)
908{
909 pps_params_t *app;
910 struct pps_fetch_args *fapi;
911#ifdef PPS_SYNC
912 struct pps_kcbind_args *kapi;
913#endif
914
915 switch (cmd) {
916 case PPS_IOC_CREATE:
917 return (0);
918 case PPS_IOC_DESTROY:
919 return (0);
920 case PPS_IOC_SETPARAMS:
921 app = (pps_params_t *)data;
922 if (app->mode & ~pps->ppscap)
923 return (EINVAL);
924 pps->ppsparam = *app;
925 return (0);
926 case PPS_IOC_GETPARAMS:
927 app = (pps_params_t *)data;
928 *app = pps->ppsparam;
929 app->api_version = PPS_API_VERS_1;
930 return (0);
931 case PPS_IOC_GETCAP:
932 *(int*)data = pps->ppscap;
933 return (0);
934 case PPS_IOC_FETCH:
935 fapi = (struct pps_fetch_args *)data;
936 if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC)
937 return (EINVAL);
938 if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec)
939 return (EOPNOTSUPP);
940 pps->ppsinfo.current_mode = pps->ppsparam.mode;
941 fapi->pps_info_buf = pps->ppsinfo;
942 return (0);
943 case PPS_IOC_KCBIND:
944#ifdef PPS_SYNC
945 kapi = (struct pps_kcbind_args *)data;
946 /* XXX Only root should be able to do this */
947 if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC)
948 return (EINVAL);
949 if (kapi->kernel_consumer != PPS_KC_HARDPPS)
950 return (EINVAL);
951 if (kapi->edge & ~pps->ppscap)
952 return (EINVAL);
953 pps->kcmode = kapi->edge;
954 return (0);
955#else
956 return (EOPNOTSUPP);
957#endif
958 default:
959 return (ENOTTY);
960 }
961}
962
963void
964pps_init(struct pps_state *pps)
965{
966 pps->ppscap |= PPS_TSFMT_TSPEC;
967 if (pps->ppscap & PPS_CAPTUREASSERT)
968 pps->ppscap |= PPS_OFFSETASSERT;
969 if (pps->ppscap & PPS_CAPTURECLEAR)
970 pps->ppscap |= PPS_OFFSETCLEAR;
971}
972
973void
88c4d2f6 974pps_event(struct pps_state *pps, sysclock_t count, int event)
984263bc 975{
88c4d2f6
MD
976 struct globaldata *gd;
977 struct timespec *tsp;
978 struct timespec *osp;
979 struct timespec ts;
980 sysclock_t *pcount;
981#ifdef PPS_SYNC
982 sysclock_t tcount;
983#endif
984 sysclock_t delta;
985 pps_seq_t *pseq;
986 int foff;
987 int fhard;
988
989 gd = mycpu;
984263bc
MD
990
991 /* Things would be easier with arrays... */
992 if (event == PPS_CAPTUREASSERT) {
993 tsp = &pps->ppsinfo.assert_timestamp;
994 osp = &pps->ppsparam.assert_offset;
995 foff = pps->ppsparam.mode & PPS_OFFSETASSERT;
996 fhard = pps->kcmode & PPS_CAPTUREASSERT;
997 pcount = &pps->ppscount[0];
998 pseq = &pps->ppsinfo.assert_sequence;
999 } else {
1000 tsp = &pps->ppsinfo.clear_timestamp;
1001 osp = &pps->ppsparam.clear_offset;
1002 foff = pps->ppsparam.mode & PPS_OFFSETCLEAR;
1003 fhard = pps->kcmode & PPS_CAPTURECLEAR;
1004 pcount = &pps->ppscount[1];
1005 pseq = &pps->ppsinfo.clear_sequence;
1006 }
1007
984263bc
MD
1008 /* Nothing really happened */
1009 if (*pcount == count)
1010 return;
1011
1012 *pcount = count;
1013
88c4d2f6
MD
1014 do {
1015 ts.tv_sec = gd->gd_time_seconds;
1016 delta = count - gd->gd_cpuclock_base;
1017 } while (ts.tv_sec != gd->gd_time_seconds);
fad57d0e
MD
1018
1019 if (delta >= cputimer_freq) {
88c4d2f6
MD
1020 ts.tv_sec += delta / cputimer_freq;
1021 delta %= cputimer_freq;
1022 }
1023 ts.tv_nsec = (cputimer_freq64_nsec * delta) >> 32;
1024 ts.tv_sec += basetime.tv_sec;
1025 ts.tv_nsec += basetime.tv_nsec;
1026 while (ts.tv_nsec >= 1000000000) {
1027 ts.tv_nsec -= 1000000000;
1028 ++ts.tv_sec;
984263bc 1029 }
984263bc
MD
1030
1031 (*pseq)++;
1032 *tsp = ts;
1033
1034 if (foff) {
1035 timespecadd(tsp, osp);
1036 if (tsp->tv_nsec < 0) {
1037 tsp->tv_nsec += 1000000000;
1038 tsp->tv_sec -= 1;
1039 }
1040 }
1041#ifdef PPS_SYNC
1042 if (fhard) {
1043 /* magic, at its best... */
1044 tcount = count - pps->ppscount[2];
1045 pps->ppscount[2] = count;
fad57d0e 1046 if (tcount >= cputimer_freq) {
64642171
JS
1047 delta = (1000000000 * (tcount / cputimer_freq) +
1048 cputimer_freq64_nsec *
fad57d0e
MD
1049 (tcount % cputimer_freq)) >> 32;
1050 } else {
1051 delta = (cputimer_freq64_nsec * tcount) >> 32;
1052 }
984263bc
MD
1053 hardpps(tsp, delta);
1054 }
1055#endif
1056}
88c4d2f6 1057