- Introduce new -g option. This allows for the broadcast time to be reduced
[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 $
e43a034f 73 * $DragonFly: src/sys/kern/kern_clock.c,v 1.43 2005/06/06 15:02:27 dillon Exp $
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74 */
75
76#include "opt_ntp.h"
77
78#include <sys/param.h>
79#include <sys/systm.h>
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80#include <sys/callout.h>
81#include <sys/kernel.h>
f5d21610 82#include <sys/kinfo.h>
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83#include <sys/proc.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>
89#include <vm/vm.h>
90#include <sys/lock.h>
91#include <vm/pmap.h>
92#include <vm/vm_map.h>
93#include <sys/sysctl.h>
2689779e 94#include <sys/thread2.h>
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95
96#include <machine/cpu.h>
97#include <machine/limits.h>
98#include <machine/smp.h>
99
100#ifdef GPROF
101#include <sys/gmon.h>
102#endif
103
104#ifdef DEVICE_POLLING
105extern void init_device_poll(void);
106extern void hardclock_device_poll(void);
107#endif /* DEVICE_POLLING */
108
402ed7e1 109static void initclocks (void *dummy);
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110SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL)
111
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112/*
113 * Some of these don't belong here, but it's easiest to concentrate them.
9eea7f0c 114 * Note that cpu_time counts in microseconds, but most userland programs
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115 * just compare relative times against the total by delta.
116 */
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117struct kinfo_cputime cputime_percpu[MAXCPU];
118#ifdef SMP
119static int
120sysctl_cputime(SYSCTL_HANDLER_ARGS)
121{
122 int cpu, error = 0;
123 size_t size = sizeof(struct kinfo_cputime);
124
125 for (cpu = 0; cpu < ncpus; ++cpu) {
126 if ((error = SYSCTL_OUT(req, &cputime_percpu[cpu], size)))
127 break;
128 }
984263bc 129
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130 return (error);
131}
132SYSCTL_PROC(_kern, OID_AUTO, cputime, (CTLTYPE_OPAQUE|CTLFLAG_RD), 0, 0,
133 sysctl_cputime, "S,kinfo_cputime", "CPU time statistics");
134#else
135SYSCTL_STRUCT(_kern, OID_AUTO, cputime, CTLFLAG_RD, &cpu_time, kinfo_cputime,
136 "CPU time statistics");
137#endif
984263bc 138
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139/*
140 * boottime is used to calculate the 'real' uptime. Do not confuse this with
141 * microuptime(). microtime() is not drift compensated. The real uptime
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142 * with compensation is nanotime() - bootime. boottime is recalculated
143 * whenever the real time is set based on the compensated elapsed time
144 * in seconds (gd->gd_time_seconds).
88c4d2f6 145 *
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146 * The gd_time_seconds and gd_cpuclock_base fields remain fairly monotonic.
147 * Slight adjustments to gd_cpuclock_base are made to phase-lock it to
148 * the real time.
149 */
150struct timespec boottime; /* boot time (realtime) for reference only */
88c4d2f6 151time_t time_second; /* read-only 'passive' uptime in seconds */
984263bc 152
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153/*
154 * basetime is used to calculate the compensated real time of day. The
155 * basetime can be modified on a per-tick basis by the adjtime(),
156 * ntp_adjtime(), and sysctl-based time correction APIs.
157 *
158 * Note that frequency corrections can also be made by adjusting
159 * gd_cpuclock_base.
160 *
161 * basetime is a tail-chasing FIFO, updated only by cpu #0. The FIFO is
162 * used on both SMP and UP systems to avoid MP races between cpu's and
163 * interrupt races on UP systems.
164 */
165#define BASETIME_ARYSIZE 16
166#define BASETIME_ARYMASK (BASETIME_ARYSIZE - 1)
167static struct timespec basetime[BASETIME_ARYSIZE];
168static volatile int basetime_index;
169
170static int
171sysctl_get_basetime(SYSCTL_HANDLER_ARGS)
172{
173 struct timespec *bt;
174 int error;
35238fa5 175 int index;
5eb5a6bc 176
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177 /*
178 * Because basetime data and index may be updated by another cpu,
179 * a load fence is required to ensure that the data we read has
180 * not been speculatively read relative to a possibly updated index.
181 */
182 index = basetime_index;
183 cpu_lfence();
184 bt = &basetime[index];
08f95c49 185 error = SYSCTL_OUT(req, bt, sizeof(*bt));
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186 return (error);
187}
188
984263bc 189SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD,
08f95c49 190 &boottime, timespec, "System boottime");
5eb5a6bc 191SYSCTL_PROC(_kern, OID_AUTO, basetime, CTLTYPE_STRUCT|CTLFLAG_RD, 0, 0,
08f95c49 192 sysctl_get_basetime, "S,timespec", "System basetime");
984263bc 193
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194static void hardclock(systimer_t info, struct intrframe *frame);
195static void statclock(systimer_t info, struct intrframe *frame);
196static void schedclock(systimer_t info, struct intrframe *frame);
5eb5a6bc 197static void getnanotime_nbt(struct timespec *nbt, struct timespec *tsp);
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198
199int ticks; /* system master ticks at hz */
da3639ef 200int clocks_running; /* tsleep/timeout clocks operational */
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201int64_t nsec_adj; /* ntpd per-tick adjustment in nsec << 32 */
202int64_t nsec_acc; /* accumulator */
984263bc 203
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204/* NTPD time correction fields */
205int64_t ntp_tick_permanent; /* per-tick adjustment in nsec << 32 */
206int64_t ntp_tick_acc; /* accumulator for per-tick adjustment */
207int64_t ntp_delta; /* one-time correction in nsec */
208int64_t ntp_big_delta = 1000000000;
209int32_t ntp_tick_delta; /* current adjustment rate */
210int32_t ntp_default_tick_delta; /* adjustment rate for ntp_delta */
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211time_t ntp_leap_second; /* time of next leap second */
212int ntp_leap_insert; /* whether to insert or remove a second */
4026c000 213
984263bc 214/*
88c4d2f6 215 * Finish initializing clock frequencies and start all clocks running.
984263bc 216 */
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217/* ARGSUSED*/
218static void
219initclocks(void *dummy)
984263bc 220{
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221 cpu_initclocks();
222#ifdef DEVICE_POLLING
223 init_device_poll();
224#endif
225 /*psratio = profhz / stathz;*/
226 initclocks_pcpu();
da3639ef 227 clocks_running = 1;
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228}
229
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230/*
231 * Called on a per-cpu basis
232 */
233void
234initclocks_pcpu(void)
235{
236 struct globaldata *gd = mycpu;
984263bc 237
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238 crit_enter();
239 if (gd->gd_cpuid == 0) {
240 gd->gd_time_seconds = 1;
044ee7c4 241 gd->gd_cpuclock_base = sys_cputimer->count();
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242 } else {
243 /* XXX */
244 gd->gd_time_seconds = globaldata_find(0)->gd_time_seconds;
245 gd->gd_cpuclock_base = globaldata_find(0)->gd_cpuclock_base;
246 }
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247
248 /*
249 * Use a non-queued periodic systimer to prevent multiple ticks from
250 * building up if the sysclock jumps forward (8254 gets reset). The
251 * sysclock will never jump backwards. Our time sync is based on
252 * the actual sysclock, not the ticks count.
253 */
254 systimer_init_periodic_nq(&gd->gd_hardclock, hardclock, NULL, hz);
255 systimer_init_periodic_nq(&gd->gd_statclock, statclock, NULL, stathz);
88c4d2f6 256 /* XXX correct the frequency for scheduler / estcpu tests */
0d1dffdf 257 systimer_init_periodic_nq(&gd->gd_schedclock, schedclock,
8478264a 258 NULL, ESTCPUFREQ);
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259 crit_exit();
260}
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261
262/*
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263 * This sets the current real time of day. Timespecs are in seconds and
264 * nanoseconds. We do not mess with gd_time_seconds and gd_cpuclock_base,
265 * instead we adjust basetime so basetime + gd_* results in the current
266 * time of day. This way the gd_* fields are guarenteed to represent
267 * a monotonically increasing 'uptime' value.
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268 *
269 * When set_timeofday() is called from userland, the system call forces it
270 * onto cpu #0 since only cpu #0 can update basetime_index.
984263bc 271 */
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272void
273set_timeofday(struct timespec *ts)
274{
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275 struct timespec *nbt;
276 int ni;
984263bc 277
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278 /*
279 * XXX SMP / non-atomic basetime updates
280 */
281 crit_enter();
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282 ni = (basetime_index + 1) & BASETIME_ARYMASK;
283 nbt = &basetime[ni];
284 nanouptime(nbt);
285 nbt->tv_sec = ts->tv_sec - nbt->tv_sec;
286 nbt->tv_nsec = ts->tv_nsec - nbt->tv_nsec;
287 if (nbt->tv_nsec < 0) {
288 nbt->tv_nsec += 1000000000;
289 --nbt->tv_sec;
88c4d2f6 290 }
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291
292 /*
293 * Note that basetime diverges from boottime as the clock drift is
294 * compensated for, so we cannot do away with boottime. When setting
295 * the absolute time of day the drift is 0 (for an instant) and we
296 * can simply assign boottime to basetime.
297 *
298 * Note that nanouptime() is based on gd_time_seconds which is drift
299 * compensated up to a point (it is guarenteed to remain monotonically
300 * increasing). gd_time_seconds is thus our best uptime guess and
301 * suitable for use in the boottime calculation. It is already taken
302 * into account in the basetime calculation above.
303 */
5eb5a6bc 304 boottime.tv_sec = nbt->tv_sec;
4026c000 305 ntp_delta = 0;
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306
307 /*
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308 * We now have a new basetime, make sure all other cpus have it,
309 * then update the index.
5eb5a6bc 310 */
35238fa5 311 cpu_sfence();
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312 basetime_index = ni;
313
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314 crit_exit();
315}
316
984263bc 317/*
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318 * Each cpu has its own hardclock, but we only increments ticks and softticks
319 * on cpu #0.
320 *
321 * NOTE! systimer! the MP lock might not be held here. We can only safely
322 * manipulate objects owned by the current cpu.
984263bc 323 */
984263bc 324static void
88c4d2f6 325hardclock(systimer_t info, struct intrframe *frame)
984263bc 326{
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327 sysclock_t cputicks;
328 struct proc *p;
329 struct pstats *pstats;
330 struct globaldata *gd = mycpu;
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331
332 /*
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333 * Realtime updates are per-cpu. Note that timer corrections as
334 * returned by microtime() and friends make an additional adjustment
335 * using a system-wise 'basetime', but the running time is always
336 * taken from the per-cpu globaldata area. Since the same clock
337 * is distributing (XXX SMP) to all cpus, the per-cpu timebases
338 * stay in synch.
339 *
340 * Note that we never allow info->time (aka gd->gd_hardclock.time)
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341 * to reverse index gd_cpuclock_base, but that it is possible for
342 * it to temporarily get behind in the seconds if something in the
343 * system locks interrupts for a long period of time. Since periodic
344 * timers count events, though everything should resynch again
345 * immediately.
984263bc 346 */
88c4d2f6 347 cputicks = info->time - gd->gd_cpuclock_base;
044ee7c4 348 if (cputicks >= sys_cputimer->freq) {
88c4d2f6 349 ++gd->gd_time_seconds;
044ee7c4 350 gd->gd_cpuclock_base += sys_cputimer->freq;
88c4d2f6 351 }
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352
353 /*
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354 * The system-wide ticks counter and NTP related timedelta/tickdelta
355 * adjustments only occur on cpu #0. NTP adjustments are accomplished
356 * by updating basetime.
984263bc 357 */
88c4d2f6 358 if (gd->gd_cpuid == 0) {
5eb5a6bc 359 struct timespec *nbt;
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360 struct timespec nts;
361 int leap;
5eb5a6bc 362 int ni;
984263bc 363
88c4d2f6 364 ++ticks;
984263bc 365
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366#ifdef DEVICE_POLLING
367 hardclock_device_poll(); /* mpsafe, short and quick */
368#endif /* DEVICE_POLLING */
984263bc 369
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370#if 0
371 if (tco->tc_poll_pps)
372 tco->tc_poll_pps(tco);
373#endif
5eb5a6bc 374
88c4d2f6 375 /*
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376 * Calculate the new basetime index. We are in a critical section
377 * on cpu #0 and can safely play with basetime_index. Start
378 * with the current basetime and then make adjustments.
379 */
380 ni = (basetime_index + 1) & BASETIME_ARYMASK;
381 nbt = &basetime[ni];
382 *nbt = basetime[basetime_index];
383
384 /*
385 * Apply adjtime corrections. (adjtime() API)
386 *
387 * adjtime() only runs on cpu #0 so our critical section is
388 * sufficient to access these variables.
88c4d2f6 389 */
4026c000 390 if (ntp_delta != 0) {
5eb5a6bc 391 nbt->tv_nsec += ntp_tick_delta;
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392 ntp_delta -= ntp_tick_delta;
393 if ((ntp_delta > 0 && ntp_delta < ntp_tick_delta) ||
394 (ntp_delta < 0 && ntp_delta > ntp_tick_delta)) {
5eb5a6bc 395 ntp_tick_delta = ntp_delta;
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396 }
397 }
398
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399 /*
400 * Apply permanent frequency corrections. (sysctl API)
401 */
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402 if (ntp_tick_permanent != 0) {
403 ntp_tick_acc += ntp_tick_permanent;
404 if (ntp_tick_acc >= (1LL << 32)) {
5eb5a6bc 405 nbt->tv_nsec += ntp_tick_acc >> 32;
331bc6f8 406 ntp_tick_acc -= (ntp_tick_acc >> 32) << 32;
4026c000 407 } else if (ntp_tick_acc <= -(1LL << 32)) {
331bc6f8 408 /* Negate ntp_tick_acc to avoid shifting the sign bit. */
5eb5a6bc 409 nbt->tv_nsec -= (-ntp_tick_acc) >> 32;
331bc6f8 410 ntp_tick_acc += ((-ntp_tick_acc) >> 32) << 32;
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411 }
412 }
413
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414 if (nbt->tv_nsec >= 1000000000) {
415 nbt->tv_sec++;
416 nbt->tv_nsec -= 1000000000;
417 } else if (nbt->tv_nsec < 0) {
418 nbt->tv_sec--;
419 nbt->tv_nsec += 1000000000;
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420 }
421
422 /*
5eb5a6bc 423 * Another per-tick compensation. (for ntp_adjtime() API)
88c4d2f6 424 */
5eb5a6bc 425 if (nsec_adj != 0) {
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426 nsec_acc += nsec_adj;
427 if (nsec_acc >= 0x100000000LL) {
5eb5a6bc 428 nbt->tv_nsec += nsec_acc >> 32;
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429 nsec_acc = (nsec_acc & 0xFFFFFFFFLL);
430 } else if (nsec_acc <= -0x100000000LL) {
5eb5a6bc 431 nbt->tv_nsec -= -nsec_acc >> 32;
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432 nsec_acc = -(-nsec_acc & 0xFFFFFFFFLL);
433 }
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434 if (nbt->tv_nsec >= 1000000000) {
435 nbt->tv_nsec -= 1000000000;
436 ++nbt->tv_sec;
437 } else if (nbt->tv_nsec < 0) {
438 nbt->tv_nsec += 1000000000;
439 --nbt->tv_sec;
440 }
441 }
442
443 /************************************************************
444 * LEAP SECOND CORRECTION *
445 ************************************************************
446 *
447 * Taking into account all the corrections made above, figure
448 * out the new real time. If the seconds field has changed
449 * then apply any pending leap-second corrections.
450 */
451 getnanotime_nbt(nbt, &nts);
452
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453 if (time_second != nts.tv_sec) {
454 /*
455 * Apply leap second (sysctl API). Adjust nts for changes
456 * so we do not have to call getnanotime_nbt again.
457 */
458 if (ntp_leap_second) {
459 if (ntp_leap_second == nts.tv_sec) {
460 if (ntp_leap_insert) {
461 nbt->tv_sec++;
462 nts.tv_sec++;
463 } else {
464 nbt->tv_sec--;
465 nts.tv_sec--;
466 }
5eb5a6bc 467 ntp_leap_second--;
32040d57 468 }
88c4d2f6 469 }
88c4d2f6 470
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471 /*
472 * Apply leap second (ntp_adjtime() API), calculate a new
473 * nsec_adj field. ntp_update_second() returns nsec_adj
474 * as a per-second value but we need it as a per-tick value.
475 */
88c4d2f6 476 leap = ntp_update_second(time_second, &nsec_adj);
88c4d2f6 477 nsec_adj /= hz;
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478 nbt->tv_sec += leap;
479 nts.tv_sec += leap;
480
481 /*
482 * Update the time_second 'approximate time' global.
483 */
484 time_second = nts.tv_sec;
88c4d2f6 485 }
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486
487 /*
488 * Finally, our new basetime is ready to go live!
489 */
35238fa5 490 cpu_sfence();
5eb5a6bc 491 basetime_index = ni;
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492 }
493
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494 /*
495 * softticks are handled for all cpus
496 */
497 hardclock_softtick(gd);
498
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499 /*
500 * ITimer handling is per-tick, per-cpu. I don't think psignal()
501 * is mpsafe on curproc, so XXX get the mplock.
502 */
503 if ((p = curproc) != NULL && try_mplock()) {
984263bc 504 pstats = p->p_stats;
88c4d2f6 505 if (frame && CLKF_USERMODE(frame) &&
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506 timevalisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) &&
507 itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0)
508 psignal(p, SIGVTALRM);
509 if (timevalisset(&pstats->p_timer[ITIMER_PROF].it_value) &&
510 itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0)
511 psignal(p, SIGPROF);
88c4d2f6 512 rel_mplock();
984263bc 513 }
604e1e09 514 setdelayed();
88c4d2f6 515}
984263bc 516
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517/*
518 * The statistics clock typically runs at a 125Hz rate, and is intended
519 * to be frequency offset from the hardclock (typ 100Hz). It is per-cpu.
520 *
521 * NOTE! systimer! the MP lock might not be held here. We can only safely
522 * manipulate objects owned by the current cpu.
523 *
524 * The stats clock is responsible for grabbing a profiling sample.
525 * Most of the statistics are only used by user-level statistics programs.
526 * The main exceptions are p->p_uticks, p->p_sticks, p->p_iticks, and
527 * p->p_estcpu.
528 *
529 * Like the other clocks, the stat clock is called from what is effectively
530 * a fast interrupt, so the context should be the thread/process that got
531 * interrupted.
532 */
533static void
534statclock(systimer_t info, struct intrframe *frame)
535{
536#ifdef GPROF
537 struct gmonparam *g;
538 int i;
984263bc 539#endif
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540 thread_t td;
541 struct proc *p;
542 int bump;
543 struct timeval tv;
544 struct timeval *stv;
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545
546 /*
88c4d2f6 547 * How big was our timeslice relative to the last time?
984263bc 548 */
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549 microuptime(&tv); /* mpsafe */
550 stv = &mycpu->gd_stattv;
551 if (stv->tv_sec == 0) {
552 bump = 1;
553 } else {
554 bump = tv.tv_usec - stv->tv_usec +
555 (tv.tv_sec - stv->tv_sec) * 1000000;
556 if (bump < 0)
557 bump = 0;
558 if (bump > 1000000)
559 bump = 1000000;
560 }
561 *stv = tv;
984263bc 562
88c4d2f6
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563 td = curthread;
564 p = td->td_proc;
984263bc 565
88c4d2f6
MD
566 if (frame && CLKF_USERMODE(frame)) {
567 /*
568 * Came from userland, handle user time and deal with
569 * possible process.
570 */
571 if (p && (p->p_flag & P_PROFIL))
572 addupc_intr(p, CLKF_PC(frame), 1);
573 td->td_uticks += bump;
984263bc 574
88c4d2f6
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575 /*
576 * Charge the time as appropriate
577 */
578 if (p && p->p_nice > NZERO)
9eea7f0c 579 cpu_time.cp_nice += bump;
88c4d2f6 580 else
9eea7f0c 581 cpu_time.cp_user += bump;
88c4d2f6
MD
582 } else {
583#ifdef GPROF
584 /*
585 * Kernel statistics are just like addupc_intr, only easier.
586 */
587 g = &_gmonparam;
588 if (g->state == GMON_PROF_ON && frame) {
589 i = CLKF_PC(frame) - g->lowpc;
590 if (i < g->textsize) {
591 i /= HISTFRACTION * sizeof(*g->kcount);
592 g->kcount[i]++;
593 }
594 }
595#endif
596 /*
597 * Came from kernel mode, so we were:
598 * - handling an interrupt,
599 * - doing syscall or trap work on behalf of the current
600 * user process, or
601 * - spinning in the idle loop.
602 * Whichever it is, charge the time as appropriate.
603 * Note that we charge interrupts to the current process,
604 * regardless of whether they are ``for'' that process,
605 * so that we know how much of its real time was spent
606 * in ``non-process'' (i.e., interrupt) work.
607 *
608 * XXX assume system if frame is NULL. A NULL frame
e43a034f 609 * can occur if ipi processing is done from a crit_exit().
88c4d2f6
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610 */
611 if (frame && CLKF_INTR(frame))
612 td->td_iticks += bump;
613 else
614 td->td_sticks += bump;
615
616 if (frame && CLKF_INTR(frame)) {
9eea7f0c 617 cpu_time.cp_intr += bump;
88c4d2f6
MD
618 } else {
619 if (td == &mycpu->gd_idlethread)
9eea7f0c 620 cpu_time.cp_idle += bump;
88c4d2f6 621 else
9eea7f0c 622 cpu_time.cp_sys += bump;
88c4d2f6
MD
623 }
624 }
625}
626
627/*
0a3f9b47 628 * The scheduler clock typically runs at a 20Hz rate. NOTE! systimer,
88c4d2f6
MD
629 * the MP lock might not be held. We can safely manipulate parts of curproc
630 * but that's about it.
631 */
632static void
633schedclock(systimer_t info, struct intrframe *frame)
634{
635 struct proc *p;
636 struct pstats *pstats;
637 struct rusage *ru;
638 struct vmspace *vm;
639 long rss;
640
641 schedulerclock(NULL); /* mpsafe */
642 if ((p = curproc) != NULL) {
643 /* Update resource usage integrals and maximums. */
644 if ((pstats = p->p_stats) != NULL &&
645 (ru = &pstats->p_ru) != NULL &&
646 (vm = p->p_vmspace) != NULL) {
647 ru->ru_ixrss += pgtok(vm->vm_tsize);
648 ru->ru_idrss += pgtok(vm->vm_dsize);
649 ru->ru_isrss += pgtok(vm->vm_ssize);
650 rss = pgtok(vmspace_resident_count(vm));
651 if (ru->ru_maxrss < rss)
652 ru->ru_maxrss = rss;
653 }
b68b7282 654 }
984263bc
MD
655}
656
657/*
a94976ad
MD
658 * Compute number of ticks for the specified amount of time. The
659 * return value is intended to be used in a clock interrupt timed
660 * operation and guarenteed to meet or exceed the requested time.
661 * If the representation overflows, return INT_MAX. The minimum return
662 * value is 1 ticks and the function will average the calculation up.
663 * If any value greater then 0 microseconds is supplied, a value
664 * of at least 2 will be returned to ensure that a near-term clock
665 * interrupt does not cause the timeout to occur (degenerately) early.
666 *
667 * Note that limit checks must take into account microseconds, which is
668 * done simply by using the smaller signed long maximum instead of
669 * the unsigned long maximum.
670 *
671 * If ints have 32 bits, then the maximum value for any timeout in
672 * 10ms ticks is 248 days.
984263bc
MD
673 */
674int
a94976ad 675tvtohz_high(struct timeval *tv)
984263bc 676{
a94976ad 677 int ticks;
1fd87d54 678 long sec, usec;
984263bc 679
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680 sec = tv->tv_sec;
681 usec = tv->tv_usec;
682 if (usec < 0) {
683 sec--;
684 usec += 1000000;
685 }
686 if (sec < 0) {
687#ifdef DIAGNOSTIC
688 if (usec > 0) {
689 sec++;
690 usec -= 1000000;
691 }
692 printf("tvotohz: negative time difference %ld sec %ld usec\n",
693 sec, usec);
694#endif
695 ticks = 1;
a94976ad
MD
696 } else if (sec <= INT_MAX / hz) {
697 ticks = (int)(sec * hz +
698 ((u_long)usec + (tick - 1)) / tick) + 1;
699 } else {
700 ticks = INT_MAX;
701 }
702 return (ticks);
703}
704
705/*
706 * Compute number of ticks for the specified amount of time, erroring on
707 * the side of it being too low to ensure that sleeping the returned number
708 * of ticks will not result in a late return.
709 *
710 * The supplied timeval may not be negative and should be normalized. A
711 * return value of 0 is possible if the timeval converts to less then
712 * 1 tick.
713 *
714 * If ints have 32 bits, then the maximum value for any timeout in
715 * 10ms ticks is 248 days.
716 */
717int
718tvtohz_low(struct timeval *tv)
719{
720 int ticks;
721 long sec;
722
723 sec = tv->tv_sec;
724 if (sec <= INT_MAX / hz)
725 ticks = (int)(sec * hz + (u_long)tv->tv_usec / tick);
984263bc 726 else
984263bc 727 ticks = INT_MAX;
a94976ad 728 return (ticks);
984263bc
MD
729}
730
a94976ad 731
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732/*
733 * Start profiling on a process.
734 *
735 * Kernel profiling passes proc0 which never exits and hence
736 * keeps the profile clock running constantly.
737 */
738void
88c4d2f6 739startprofclock(struct proc *p)
984263bc 740{
984263bc
MD
741 if ((p->p_flag & P_PROFIL) == 0) {
742 p->p_flag |= P_PROFIL;
88c4d2f6 743#if 0 /* XXX */
984263bc 744 if (++profprocs == 1 && stathz != 0) {
e43a034f 745 crit_enter();
6ad39cae 746 psdiv = psratio;
984263bc 747 setstatclockrate(profhz);
e43a034f 748 crit_exit();
984263bc 749 }
88c4d2f6 750#endif
984263bc
MD
751 }
752}
753
754/*
755 * Stop profiling on a process.
756 */
757void
88c4d2f6 758stopprofclock(struct proc *p)
984263bc 759{
984263bc
MD
760 if (p->p_flag & P_PROFIL) {
761 p->p_flag &= ~P_PROFIL;
88c4d2f6 762#if 0 /* XXX */
984263bc 763 if (--profprocs == 0 && stathz != 0) {
e43a034f 764 crit_enter();
6ad39cae 765 psdiv = 1;
984263bc 766 setstatclockrate(stathz);
e43a034f 767 crit_exit();
984263bc 768 }
984263bc 769#endif
984263bc
MD
770 }
771}
772
773/*
774 * Return information about system clocks.
775 */
776static int
777sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
778{
f5d21610 779 struct kinfo_clockinfo clkinfo;
984263bc
MD
780 /*
781 * Construct clockinfo structure.
782 */
f5d21610
JS
783 clkinfo.ci_hz = hz;
784 clkinfo.ci_tick = tick;
4026c000 785 clkinfo.ci_tickadj = ntp_default_tick_delta / 1000;
f5d21610
JS
786 clkinfo.ci_profhz = profhz;
787 clkinfo.ci_stathz = stathz ? stathz : hz;
984263bc
MD
788 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req));
789}
790
791SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
792 0, 0, sysctl_kern_clockrate, "S,clockinfo","");
793
984263bc
MD
794/*
795 * We have eight functions for looking at the clock, four for
796 * microseconds and four for nanoseconds. For each there is fast
797 * but less precise version "get{nano|micro}[up]time" which will
798 * return a time which is up to 1/HZ previous to the call, whereas
799 * the raw version "{nano|micro}[up]time" will return a timestamp
800 * which is as precise as possible. The "up" variants return the
801 * time relative to system boot, these are well suited for time
802 * interval measurements.
88c4d2f6
MD
803 *
804 * Each cpu independantly maintains the current time of day, so all
805 * we need to do to protect ourselves from changes is to do a loop
806 * check on the seconds field changing out from under us.
fad57d0e
MD
807 *
808 * The system timer maintains a 32 bit count and due to various issues
809 * it is possible for the calculated delta to occassionally exceed
044ee7c4
MD
810 * sys_cputimer->freq. If this occurs the sys_cputimer->freq64_nsec
811 * multiplication can easily overflow, so we deal with the case. For
812 * uniformity we deal with the case in the usec case too.
984263bc 813 */
984263bc
MD
814void
815getmicrouptime(struct timeval *tvp)
816{
88c4d2f6
MD
817 struct globaldata *gd = mycpu;
818 sysclock_t delta;
819
820 do {
821 tvp->tv_sec = gd->gd_time_seconds;
822 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
823 } while (tvp->tv_sec != gd->gd_time_seconds);
fad57d0e 824
044ee7c4
MD
825 if (delta >= sys_cputimer->freq) {
826 tvp->tv_sec += delta / sys_cputimer->freq;
827 delta %= sys_cputimer->freq;
fad57d0e 828 }
044ee7c4 829 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32;
88c4d2f6
MD
830 if (tvp->tv_usec >= 1000000) {
831 tvp->tv_usec -= 1000000;
832 ++tvp->tv_sec;
984263bc
MD
833 }
834}
835
836void
837getnanouptime(struct timespec *tsp)
838{
88c4d2f6
MD
839 struct globaldata *gd = mycpu;
840 sysclock_t delta;
841
842 do {
843 tsp->tv_sec = gd->gd_time_seconds;
844 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
845 } while (tsp->tv_sec != gd->gd_time_seconds);
fad57d0e 846
044ee7c4
MD
847 if (delta >= sys_cputimer->freq) {
848 tsp->tv_sec += delta / sys_cputimer->freq;
849 delta %= sys_cputimer->freq;
984263bc 850 }
044ee7c4 851 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32;
984263bc
MD
852}
853
854void
88c4d2f6 855microuptime(struct timeval *tvp)
984263bc 856{
88c4d2f6
MD
857 struct globaldata *gd = mycpu;
858 sysclock_t delta;
859
860 do {
861 tvp->tv_sec = gd->gd_time_seconds;
044ee7c4 862 delta = sys_cputimer->count() - gd->gd_cpuclock_base;
88c4d2f6 863 } while (tvp->tv_sec != gd->gd_time_seconds);
fad57d0e 864
044ee7c4
MD
865 if (delta >= sys_cputimer->freq) {
866 tvp->tv_sec += delta / sys_cputimer->freq;
867 delta %= sys_cputimer->freq;
984263bc 868 }
044ee7c4 869 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32;
984263bc
MD
870}
871
872void
88c4d2f6 873nanouptime(struct timespec *tsp)
984263bc 874{
88c4d2f6
MD
875 struct globaldata *gd = mycpu;
876 sysclock_t delta;
877
878 do {
879 tsp->tv_sec = gd->gd_time_seconds;
044ee7c4 880 delta = sys_cputimer->count() - gd->gd_cpuclock_base;
88c4d2f6 881 } while (tsp->tv_sec != gd->gd_time_seconds);
fad57d0e 882
044ee7c4
MD
883 if (delta >= sys_cputimer->freq) {
884 tsp->tv_sec += delta / sys_cputimer->freq;
885 delta %= sys_cputimer->freq;
984263bc 886 }
044ee7c4 887 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32;
984263bc
MD
888}
889
88c4d2f6
MD
890/*
891 * realtime routines
892 */
984263bc
MD
893
894void
88c4d2f6 895getmicrotime(struct timeval *tvp)
984263bc 896{
88c4d2f6 897 struct globaldata *gd = mycpu;
5eb5a6bc 898 struct timespec *bt;
88c4d2f6 899 sysclock_t delta;
984263bc 900
88c4d2f6
MD
901 do {
902 tvp->tv_sec = gd->gd_time_seconds;
903 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
904 } while (tvp->tv_sec != gd->gd_time_seconds);
fad57d0e 905
044ee7c4
MD
906 if (delta >= sys_cputimer->freq) {
907 tvp->tv_sec += delta / sys_cputimer->freq;
908 delta %= sys_cputimer->freq;
fad57d0e 909 }
044ee7c4 910 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32;
984263bc 911
5eb5a6bc
MD
912 bt = &basetime[basetime_index];
913 tvp->tv_sec += bt->tv_sec;
914 tvp->tv_usec += bt->tv_nsec / 1000;
88c4d2f6
MD
915 while (tvp->tv_usec >= 1000000) {
916 tvp->tv_usec -= 1000000;
917 ++tvp->tv_sec;
984263bc 918 }
984263bc
MD
919}
920
921void
88c4d2f6 922getnanotime(struct timespec *tsp)
984263bc 923{
88c4d2f6 924 struct globaldata *gd = mycpu;
5eb5a6bc 925 struct timespec *bt;
88c4d2f6 926 sysclock_t delta;
984263bc 927
88c4d2f6
MD
928 do {
929 tsp->tv_sec = gd->gd_time_seconds;
930 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
931 } while (tsp->tv_sec != gd->gd_time_seconds);
fad57d0e 932
044ee7c4
MD
933 if (delta >= sys_cputimer->freq) {
934 tsp->tv_sec += delta / sys_cputimer->freq;
935 delta %= sys_cputimer->freq;
fad57d0e 936 }
044ee7c4 937 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32;
984263bc 938
5eb5a6bc
MD
939 bt = &basetime[basetime_index];
940 tsp->tv_sec += bt->tv_sec;
941 tsp->tv_nsec += bt->tv_nsec;
88c4d2f6
MD
942 while (tsp->tv_nsec >= 1000000000) {
943 tsp->tv_nsec -= 1000000000;
944 ++tsp->tv_sec;
984263bc 945 }
984263bc
MD
946}
947
5eb5a6bc
MD
948static void
949getnanotime_nbt(struct timespec *nbt, struct timespec *tsp)
950{
951 struct globaldata *gd = mycpu;
952 sysclock_t delta;
953
954 do {
955 tsp->tv_sec = gd->gd_time_seconds;
956 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
957 } while (tsp->tv_sec != gd->gd_time_seconds);
958
044ee7c4
MD
959 if (delta >= sys_cputimer->freq) {
960 tsp->tv_sec += delta / sys_cputimer->freq;
961 delta %= sys_cputimer->freq;
5eb5a6bc 962 }
044ee7c4 963 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32;
5eb5a6bc
MD
964
965 tsp->tv_sec += nbt->tv_sec;
966 tsp->tv_nsec += nbt->tv_nsec;
967 while (tsp->tv_nsec >= 1000000000) {
968 tsp->tv_nsec -= 1000000000;
969 ++tsp->tv_sec;
970 }
971}
972
973
88c4d2f6
MD
974void
975microtime(struct timeval *tvp)
984263bc 976{
88c4d2f6 977 struct globaldata *gd = mycpu;
5eb5a6bc 978 struct timespec *bt;
88c4d2f6 979 sysclock_t delta;
984263bc 980
88c4d2f6
MD
981 do {
982 tvp->tv_sec = gd->gd_time_seconds;
044ee7c4 983 delta = sys_cputimer->count() - gd->gd_cpuclock_base;
88c4d2f6 984 } while (tvp->tv_sec != gd->gd_time_seconds);
fad57d0e 985
044ee7c4
MD
986 if (delta >= sys_cputimer->freq) {
987 tvp->tv_sec += delta / sys_cputimer->freq;
988 delta %= sys_cputimer->freq;
fad57d0e 989 }
044ee7c4 990 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32;
984263bc 991
5eb5a6bc
MD
992 bt = &basetime[basetime_index];
993 tvp->tv_sec += bt->tv_sec;
994 tvp->tv_usec += bt->tv_nsec / 1000;
88c4d2f6
MD
995 while (tvp->tv_usec >= 1000000) {
996 tvp->tv_usec -= 1000000;
997 ++tvp->tv_sec;
984263bc 998 }
984263bc
MD
999}
1000
88c4d2f6
MD
1001void
1002nanotime(struct timespec *tsp)
1003{
1004 struct globaldata *gd = mycpu;
5eb5a6bc 1005 struct timespec *bt;
88c4d2f6 1006 sysclock_t delta;
984263bc 1007
88c4d2f6
MD
1008 do {
1009 tsp->tv_sec = gd->gd_time_seconds;
044ee7c4 1010 delta = sys_cputimer->count() - gd->gd_cpuclock_base;
88c4d2f6 1011 } while (tsp->tv_sec != gd->gd_time_seconds);
fad57d0e 1012
044ee7c4
MD
1013 if (delta >= sys_cputimer->freq) {
1014 tsp->tv_sec += delta / sys_cputimer->freq;
1015 delta %= sys_cputimer->freq;
fad57d0e 1016 }
044ee7c4 1017 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32;
984263bc 1018
5eb5a6bc
MD
1019 bt = &basetime[basetime_index];
1020 tsp->tv_sec += bt->tv_sec;
1021 tsp->tv_nsec += bt->tv_nsec;
88c4d2f6
MD
1022 while (tsp->tv_nsec >= 1000000000) {
1023 tsp->tv_nsec -= 1000000000;
1024 ++tsp->tv_sec;
984263bc 1025 }
984263bc
MD
1026}
1027
25b804e7
MD
1028/*
1029 * note: this is not exactly synchronized with real time. To do that we
1030 * would have to do what microtime does and check for a nanoseconds overflow.
1031 */
1032time_t
1033get_approximate_time_t(void)
1034{
1035 struct globaldata *gd = mycpu;
5eb5a6bc
MD
1036 struct timespec *bt;
1037
1038 bt = &basetime[basetime_index];
1039 return(gd->gd_time_seconds + bt->tv_sec);
25b804e7
MD
1040}
1041
984263bc
MD
1042int
1043pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps)
1044{
1045 pps_params_t *app;
1046 struct pps_fetch_args *fapi;
1047#ifdef PPS_SYNC
1048 struct pps_kcbind_args *kapi;
1049#endif
1050
1051 switch (cmd) {
1052 case PPS_IOC_CREATE:
1053 return (0);
1054 case PPS_IOC_DESTROY:
1055 return (0);
1056 case PPS_IOC_SETPARAMS:
1057 app = (pps_params_t *)data;
1058 if (app->mode & ~pps->ppscap)
1059 return (EINVAL);
1060 pps->ppsparam = *app;
1061 return (0);
1062 case PPS_IOC_GETPARAMS:
1063 app = (pps_params_t *)data;
1064 *app = pps->ppsparam;
1065 app->api_version = PPS_API_VERS_1;
1066 return (0);
1067 case PPS_IOC_GETCAP:
1068 *(int*)data = pps->ppscap;
1069 return (0);
1070 case PPS_IOC_FETCH:
1071 fapi = (struct pps_fetch_args *)data;
1072 if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC)
1073 return (EINVAL);
1074 if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec)
1075 return (EOPNOTSUPP);
1076 pps->ppsinfo.current_mode = pps->ppsparam.mode;
1077 fapi->pps_info_buf = pps->ppsinfo;
1078 return (0);
1079 case PPS_IOC_KCBIND:
1080#ifdef PPS_SYNC
1081 kapi = (struct pps_kcbind_args *)data;
1082 /* XXX Only root should be able to do this */
1083 if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC)
1084 return (EINVAL);
1085 if (kapi->kernel_consumer != PPS_KC_HARDPPS)
1086 return (EINVAL);
1087 if (kapi->edge & ~pps->ppscap)
1088 return (EINVAL);
1089 pps->kcmode = kapi->edge;
1090 return (0);
1091#else
1092 return (EOPNOTSUPP);
1093#endif
1094 default:
1095 return (ENOTTY);
1096 }
1097}
1098
1099void
1100pps_init(struct pps_state *pps)
1101{
1102 pps->ppscap |= PPS_TSFMT_TSPEC;
1103 if (pps->ppscap & PPS_CAPTUREASSERT)
1104 pps->ppscap |= PPS_OFFSETASSERT;
1105 if (pps->ppscap & PPS_CAPTURECLEAR)
1106 pps->ppscap |= PPS_OFFSETCLEAR;
1107}
1108
1109void
88c4d2f6 1110pps_event(struct pps_state *pps, sysclock_t count, int event)
984263bc 1111{
88c4d2f6
MD
1112 struct globaldata *gd;
1113 struct timespec *tsp;
1114 struct timespec *osp;
5eb5a6bc 1115 struct timespec *bt;
88c4d2f6
MD
1116 struct timespec ts;
1117 sysclock_t *pcount;
1118#ifdef PPS_SYNC
1119 sysclock_t tcount;
1120#endif
1121 sysclock_t delta;
1122 pps_seq_t *pseq;
1123 int foff;
1124 int fhard;
1125
1126 gd = mycpu;
984263bc
MD
1127
1128 /* Things would be easier with arrays... */
1129 if (event == PPS_CAPTUREASSERT) {
1130 tsp = &pps->ppsinfo.assert_timestamp;
1131 osp = &pps->ppsparam.assert_offset;
1132 foff = pps->ppsparam.mode & PPS_OFFSETASSERT;
1133 fhard = pps->kcmode & PPS_CAPTUREASSERT;
1134 pcount = &pps->ppscount[0];
1135 pseq = &pps->ppsinfo.assert_sequence;
1136 } else {
1137 tsp = &pps->ppsinfo.clear_timestamp;
1138 osp = &pps->ppsparam.clear_offset;
1139 foff = pps->ppsparam.mode & PPS_OFFSETCLEAR;
1140 fhard = pps->kcmode & PPS_CAPTURECLEAR;
1141 pcount = &pps->ppscount[1];
1142 pseq = &pps->ppsinfo.clear_sequence;
1143 }
1144
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1145 /* Nothing really happened */
1146 if (*pcount == count)
1147 return;
1148
1149 *pcount = count;
1150
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1151 do {
1152 ts.tv_sec = gd->gd_time_seconds;
1153 delta = count - gd->gd_cpuclock_base;
1154 } while (ts.tv_sec != gd->gd_time_seconds);
fad57d0e 1155
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1156 if (delta >= sys_cputimer->freq) {
1157 ts.tv_sec += delta / sys_cputimer->freq;
1158 delta %= sys_cputimer->freq;
88c4d2f6 1159 }
044ee7c4 1160 ts.tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32;
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1161 bt = &basetime[basetime_index];
1162 ts.tv_sec += bt->tv_sec;
1163 ts.tv_nsec += bt->tv_nsec;
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1164 while (ts.tv_nsec >= 1000000000) {
1165 ts.tv_nsec -= 1000000000;
1166 ++ts.tv_sec;
984263bc 1167 }
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1168
1169 (*pseq)++;
1170 *tsp = ts;
1171
1172 if (foff) {
1173 timespecadd(tsp, osp);
1174 if (tsp->tv_nsec < 0) {
1175 tsp->tv_nsec += 1000000000;
1176 tsp->tv_sec -= 1;
1177 }
1178 }
1179#ifdef PPS_SYNC
1180 if (fhard) {
1181 /* magic, at its best... */
1182 tcount = count - pps->ppscount[2];
1183 pps->ppscount[2] = count;
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1184 if (tcount >= sys_cputimer->freq) {
1185 delta = (1000000000 * (tcount / sys_cputimer->freq) +
1186 sys_cputimer->freq64_nsec *
1187 (tcount % sys_cputimer->freq)) >> 32;
fad57d0e 1188 } else {
044ee7c4 1189 delta = (sys_cputimer->freq64_nsec * tcount) >> 32;
fad57d0e 1190 }
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1191 hardpps(tsp, delta);
1192 }
1193#endif
1194}
88c4d2f6 1195