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 * 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 $ 73 * $DragonFly: src/sys/kern/kern_clock.c,v 1.62 2008/09/09 04:06:13 dillon Exp $ 74 */ 75 76 #include "opt_ntp.h" 77 #include "opt_polling.h" 78 #include "opt_ifpoll.h" 79 #include "opt_pctrack.h" 80 81 #include <sys/param.h> 82 #include <sys/systm.h> 83 #include <sys/callout.h> 84 #include <sys/kernel.h> 85 #include <sys/kinfo.h> 86 #include <sys/proc.h> 87 #include <sys/malloc.h> 88 #include <sys/resourcevar.h> 89 #include <sys/signalvar.h> 90 #include <sys/timex.h> 91 #include <sys/timepps.h> 92 #include <vm/vm.h> 93 #include <sys/lock.h> 94 #include <vm/pmap.h> 95 #include <vm/vm_map.h> 96 #include <vm/vm_extern.h> 97 #include <sys/sysctl.h> 98 99 #include <sys/thread2.h> 100 #include <sys/mplock2.h> 101 102 #include <machine/cpu.h> 103 #include <machine/limits.h> 104 #include <machine/smp.h> 105 #include <machine/cpufunc.h> 106 #include <machine/specialreg.h> 107 #include <machine/clock.h> 108 109 #ifdef GPROF 110 #include <sys/gmon.h> 111 #endif 112 113 #ifdef DEVICE_POLLING 114 extern void init_device_poll_pcpu(int); 115 #endif 116 117 #ifdef IFPOLL_ENABLE 118 extern void ifpoll_init_pcpu(int); 119 #endif 120 121 #ifdef DEBUG_PCTRACK 122 static void do_pctrack(struct intrframe *frame, int which); 123 #endif 124 125 static void initclocks (void *dummy); 126 SYSINIT(clocks, SI_BOOT2_CLOCKS, SI_ORDER_FIRST, initclocks, NULL) 127 128 /* 129 * Some of these don't belong here, but it's easiest to concentrate them. 130 * Note that cpu_time counts in microseconds, but most userland programs 131 * just compare relative times against the total by delta. 132 */ 133 struct kinfo_cputime cputime_percpu[MAXCPU]; 134 #ifdef DEBUG_PCTRACK 135 struct kinfo_pcheader cputime_pcheader = { PCTRACK_SIZE, PCTRACK_ARYSIZE }; 136 struct kinfo_pctrack cputime_pctrack[MAXCPU][PCTRACK_SIZE]; 137 #endif 138 139 #ifdef SMP 140 static int 141 sysctl_cputime(SYSCTL_HANDLER_ARGS) 142 { 143 int cpu, error = 0; 144 size_t size = sizeof(struct kinfo_cputime); 145 146 for (cpu = 0; cpu < ncpus; ++cpu) { 147 if ((error = SYSCTL_OUT(req, &cputime_percpu[cpu], size))) 148 break; 149 } 150 151 return (error); 152 } 153 SYSCTL_PROC(_kern, OID_AUTO, cputime, (CTLTYPE_OPAQUE|CTLFLAG_RD), 0, 0, 154 sysctl_cputime, "S,kinfo_cputime", "CPU time statistics"); 155 #else 156 SYSCTL_STRUCT(_kern, OID_AUTO, cputime, CTLFLAG_RD, &cpu_time, kinfo_cputime, 157 "CPU time statistics"); 158 #endif 159 160 /* 161 * boottime is used to calculate the 'real' uptime. Do not confuse this with 162 * microuptime(). microtime() is not drift compensated. The real uptime 163 * with compensation is nanotime() - bootime. boottime is recalculated 164 * whenever the real time is set based on the compensated elapsed time 165 * in seconds (gd->gd_time_seconds). 166 * 167 * The gd_time_seconds and gd_cpuclock_base fields remain fairly monotonic. 168 * Slight adjustments to gd_cpuclock_base are made to phase-lock it to 169 * the real time. 170 */ 171 struct timespec boottime; /* boot time (realtime) for reference only */ 172 time_t time_second; /* read-only 'passive' uptime in seconds */ 173 174 /* 175 * basetime is used to calculate the compensated real time of day. The 176 * basetime can be modified on a per-tick basis by the adjtime(), 177 * ntp_adjtime(), and sysctl-based time correction APIs. 178 * 179 * Note that frequency corrections can also be made by adjusting 180 * gd_cpuclock_base. 181 * 182 * basetime is a tail-chasing FIFO, updated only by cpu #0. The FIFO is 183 * used on both SMP and UP systems to avoid MP races between cpu's and 184 * interrupt races on UP systems. 185 */ 186 #define BASETIME_ARYSIZE 16 187 #define BASETIME_ARYMASK (BASETIME_ARYSIZE - 1) 188 static struct timespec basetime[BASETIME_ARYSIZE]; 189 static volatile int basetime_index; 190 191 static int 192 sysctl_get_basetime(SYSCTL_HANDLER_ARGS) 193 { 194 struct timespec *bt; 195 int error; 196 int index; 197 198 /* 199 * Because basetime data and index may be updated by another cpu, 200 * a load fence is required to ensure that the data we read has 201 * not been speculatively read relative to a possibly updated index. 202 */ 203 index = basetime_index; 204 cpu_lfence(); 205 bt = &basetime[index]; 206 error = SYSCTL_OUT(req, bt, sizeof(*bt)); 207 return (error); 208 } 209 210 SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD, 211 &boottime, timespec, "System boottime"); 212 SYSCTL_PROC(_kern, OID_AUTO, basetime, CTLTYPE_STRUCT|CTLFLAG_RD, 0, 0, 213 sysctl_get_basetime, "S,timespec", "System basetime"); 214 215 static void hardclock(systimer_t info, struct intrframe *frame); 216 static void statclock(systimer_t info, struct intrframe *frame); 217 static void schedclock(systimer_t info, struct intrframe *frame); 218 static void getnanotime_nbt(struct timespec *nbt, struct timespec *tsp); 219 220 int ticks; /* system master ticks at hz */ 221 int clocks_running; /* tsleep/timeout clocks operational */ 222 int64_t nsec_adj; /* ntpd per-tick adjustment in nsec << 32 */ 223 int64_t nsec_acc; /* accumulator */ 224 225 /* NTPD time correction fields */ 226 int64_t ntp_tick_permanent; /* per-tick adjustment in nsec << 32 */ 227 int64_t ntp_tick_acc; /* accumulator for per-tick adjustment */ 228 int64_t ntp_delta; /* one-time correction in nsec */ 229 int64_t ntp_big_delta = 1000000000; 230 int32_t ntp_tick_delta; /* current adjustment rate */ 231 int32_t ntp_default_tick_delta; /* adjustment rate for ntp_delta */ 232 time_t ntp_leap_second; /* time of next leap second */ 233 int ntp_leap_insert; /* whether to insert or remove a second */ 234 235 /* 236 * Finish initializing clock frequencies and start all clocks running. 237 */ 238 /* ARGSUSED*/ 239 static void 240 initclocks(void *dummy) 241 { 242 /*psratio = profhz / stathz;*/ 243 initclocks_pcpu(); 244 clocks_running = 1; 245 } 246 247 /* 248 * Called on a per-cpu basis 249 */ 250 void 251 initclocks_pcpu(void) 252 { 253 struct globaldata *gd = mycpu; 254 255 crit_enter(); 256 if (gd->gd_cpuid == 0) { 257 gd->gd_time_seconds = 1; 258 gd->gd_cpuclock_base = sys_cputimer->count(); 259 } else { 260 /* XXX */ 261 gd->gd_time_seconds = globaldata_find(0)->gd_time_seconds; 262 gd->gd_cpuclock_base = globaldata_find(0)->gd_cpuclock_base; 263 } 264 265 systimer_intr_enable(); 266 267 #ifdef DEVICE_POLLING 268 init_device_poll_pcpu(gd->gd_cpuid); 269 #endif 270 271 #ifdef IFPOLL_ENABLE 272 ifpoll_init_pcpu(gd->gd_cpuid); 273 #endif 274 275 /* 276 * Use a non-queued periodic systimer to prevent multiple ticks from 277 * building up if the sysclock jumps forward (8254 gets reset). The 278 * sysclock will never jump backwards. Our time sync is based on 279 * the actual sysclock, not the ticks count. 280 */ 281 systimer_init_periodic_nq(&gd->gd_hardclock, hardclock, NULL, hz); 282 systimer_init_periodic_nq(&gd->gd_statclock, statclock, NULL, stathz); 283 /* XXX correct the frequency for scheduler / estcpu tests */ 284 systimer_init_periodic_nq(&gd->gd_schedclock, schedclock, 285 NULL, ESTCPUFREQ); 286 crit_exit(); 287 } 288 289 /* 290 * This sets the current real time of day. Timespecs are in seconds and 291 * nanoseconds. We do not mess with gd_time_seconds and gd_cpuclock_base, 292 * instead we adjust basetime so basetime + gd_* results in the current 293 * time of day. This way the gd_* fields are guarenteed to represent 294 * a monotonically increasing 'uptime' value. 295 * 296 * When set_timeofday() is called from userland, the system call forces it 297 * onto cpu #0 since only cpu #0 can update basetime_index. 298 */ 299 void 300 set_timeofday(struct timespec *ts) 301 { 302 struct timespec *nbt; 303 int ni; 304 305 /* 306 * XXX SMP / non-atomic basetime updates 307 */ 308 crit_enter(); 309 ni = (basetime_index + 1) & BASETIME_ARYMASK; 310 nbt = &basetime[ni]; 311 nanouptime(nbt); 312 nbt->tv_sec = ts->tv_sec - nbt->tv_sec; 313 nbt->tv_nsec = ts->tv_nsec - nbt->tv_nsec; 314 if (nbt->tv_nsec < 0) { 315 nbt->tv_nsec += 1000000000; 316 --nbt->tv_sec; 317 } 318 319 /* 320 * Note that basetime diverges from boottime as the clock drift is 321 * compensated for, so we cannot do away with boottime. When setting 322 * the absolute time of day the drift is 0 (for an instant) and we 323 * can simply assign boottime to basetime. 324 * 325 * Note that nanouptime() is based on gd_time_seconds which is drift 326 * compensated up to a point (it is guarenteed to remain monotonically 327 * increasing). gd_time_seconds is thus our best uptime guess and 328 * suitable for use in the boottime calculation. It is already taken 329 * into account in the basetime calculation above. 330 */ 331 boottime.tv_sec = nbt->tv_sec; 332 ntp_delta = 0; 333 334 /* 335 * We now have a new basetime, make sure all other cpus have it, 336 * then update the index. 337 */ 338 cpu_sfence(); 339 basetime_index = ni; 340 341 crit_exit(); 342 } 343 344 /* 345 * Each cpu has its own hardclock, but we only increments ticks and softticks 346 * on cpu #0. 347 * 348 * NOTE! systimer! the MP lock might not be held here. We can only safely 349 * manipulate objects owned by the current cpu. 350 */ 351 static void 352 hardclock(systimer_t info, struct intrframe *frame) 353 { 354 sysclock_t cputicks; 355 struct proc *p; 356 struct globaldata *gd = mycpu; 357 358 /* 359 * Realtime updates are per-cpu. Note that timer corrections as 360 * returned by microtime() and friends make an additional adjustment 361 * using a system-wise 'basetime', but the running time is always 362 * taken from the per-cpu globaldata area. Since the same clock 363 * is distributing (XXX SMP) to all cpus, the per-cpu timebases 364 * stay in synch. 365 * 366 * Note that we never allow info->time (aka gd->gd_hardclock.time) 367 * to reverse index gd_cpuclock_base, but that it is possible for 368 * it to temporarily get behind in the seconds if something in the 369 * system locks interrupts for a long period of time. Since periodic 370 * timers count events, though everything should resynch again 371 * immediately. 372 */ 373 cputicks = info->time - gd->gd_cpuclock_base; 374 if (cputicks >= sys_cputimer->freq) { 375 ++gd->gd_time_seconds; 376 gd->gd_cpuclock_base += sys_cputimer->freq; 377 } 378 379 /* 380 * The system-wide ticks counter and NTP related timedelta/tickdelta 381 * adjustments only occur on cpu #0. NTP adjustments are accomplished 382 * by updating basetime. 383 */ 384 if (gd->gd_cpuid == 0) { 385 struct timespec *nbt; 386 struct timespec nts; 387 int leap; 388 int ni; 389 390 ++ticks; 391 392 #if 0 393 if (tco->tc_poll_pps) 394 tco->tc_poll_pps(tco); 395 #endif 396 397 /* 398 * Calculate the new basetime index. We are in a critical section 399 * on cpu #0 and can safely play with basetime_index. Start 400 * with the current basetime and then make adjustments. 401 */ 402 ni = (basetime_index + 1) & BASETIME_ARYMASK; 403 nbt = &basetime[ni]; 404 *nbt = basetime[basetime_index]; 405 406 /* 407 * Apply adjtime corrections. (adjtime() API) 408 * 409 * adjtime() only runs on cpu #0 so our critical section is 410 * sufficient to access these variables. 411 */ 412 if (ntp_delta != 0) { 413 nbt->tv_nsec += ntp_tick_delta; 414 ntp_delta -= ntp_tick_delta; 415 if ((ntp_delta > 0 && ntp_delta < ntp_tick_delta) || 416 (ntp_delta < 0 && ntp_delta > ntp_tick_delta)) { 417 ntp_tick_delta = ntp_delta; 418 } 419 } 420 421 /* 422 * Apply permanent frequency corrections. (sysctl API) 423 */ 424 if (ntp_tick_permanent != 0) { 425 ntp_tick_acc += ntp_tick_permanent; 426 if (ntp_tick_acc >= (1LL << 32)) { 427 nbt->tv_nsec += ntp_tick_acc >> 32; 428 ntp_tick_acc -= (ntp_tick_acc >> 32) << 32; 429 } else if (ntp_tick_acc <= -(1LL << 32)) { 430 /* Negate ntp_tick_acc to avoid shifting the sign bit. */ 431 nbt->tv_nsec -= (-ntp_tick_acc) >> 32; 432 ntp_tick_acc += ((-ntp_tick_acc) >> 32) << 32; 433 } 434 } 435 436 if (nbt->tv_nsec >= 1000000000) { 437 nbt->tv_sec++; 438 nbt->tv_nsec -= 1000000000; 439 } else if (nbt->tv_nsec < 0) { 440 nbt->tv_sec--; 441 nbt->tv_nsec += 1000000000; 442 } 443 444 /* 445 * Another per-tick compensation. (for ntp_adjtime() API) 446 */ 447 if (nsec_adj != 0) { 448 nsec_acc += nsec_adj; 449 if (nsec_acc >= 0x100000000LL) { 450 nbt->tv_nsec += nsec_acc >> 32; 451 nsec_acc = (nsec_acc & 0xFFFFFFFFLL); 452 } else if (nsec_acc <= -0x100000000LL) { 453 nbt->tv_nsec -= -nsec_acc >> 32; 454 nsec_acc = -(-nsec_acc & 0xFFFFFFFFLL); 455 } 456 if (nbt->tv_nsec >= 1000000000) { 457 nbt->tv_nsec -= 1000000000; 458 ++nbt->tv_sec; 459 } else if (nbt->tv_nsec < 0) { 460 nbt->tv_nsec += 1000000000; 461 --nbt->tv_sec; 462 } 463 } 464 465 /************************************************************ 466 * LEAP SECOND CORRECTION * 467 ************************************************************ 468 * 469 * Taking into account all the corrections made above, figure 470 * out the new real time. If the seconds field has changed 471 * then apply any pending leap-second corrections. 472 */ 473 getnanotime_nbt(nbt, &nts); 474 475 if (time_second != nts.tv_sec) { 476 /* 477 * Apply leap second (sysctl API). Adjust nts for changes 478 * so we do not have to call getnanotime_nbt again. 479 */ 480 if (ntp_leap_second) { 481 if (ntp_leap_second == nts.tv_sec) { 482 if (ntp_leap_insert) { 483 nbt->tv_sec++; 484 nts.tv_sec++; 485 } else { 486 nbt->tv_sec--; 487 nts.tv_sec--; 488 } 489 ntp_leap_second--; 490 } 491 } 492 493 /* 494 * Apply leap second (ntp_adjtime() API), calculate a new 495 * nsec_adj field. ntp_update_second() returns nsec_adj 496 * as a per-second value but we need it as a per-tick value. 497 */ 498 leap = ntp_update_second(time_second, &nsec_adj); 499 nsec_adj /= hz; 500 nbt->tv_sec += leap; 501 nts.tv_sec += leap; 502 503 /* 504 * Update the time_second 'approximate time' global. 505 */ 506 time_second = nts.tv_sec; 507 } 508 509 /* 510 * Finally, our new basetime is ready to go live! 511 */ 512 cpu_sfence(); 513 basetime_index = ni; 514 515 /* 516 * Figure out how badly the system is starved for memory 517 */ 518 vm_fault_ratecheck(); 519 } 520 521 /* 522 * lwkt thread scheduler fair queueing 523 */ 524 lwkt_fairq_schedulerclock(curthread); 525 526 /* 527 * softticks are handled for all cpus 528 */ 529 hardclock_softtick(gd); 530 531 /* 532 * The LWKT scheduler will generally allow the current process to 533 * return to user mode even if there are other runnable LWKT threads 534 * running in kernel mode on behalf of a user process. This will 535 * ensure that those other threads have an opportunity to run in 536 * fairly short order (but not instantly). 537 */ 538 need_lwkt_resched(); 539 540 /* 541 * ITimer handling is per-tick, per-cpu. I don't think ksignal() 542 * is mpsafe on curproc, so XXX get the mplock. 543 */ 544 if ((p = curproc) != NULL && lwkt_trytoken(&proc_token)) { 545 crit_enter_hard(); 546 if (frame && CLKF_USERMODE(frame) && 547 timevalisset(&p->p_timer[ITIMER_VIRTUAL].it_value) && 548 itimerdecr(&p->p_timer[ITIMER_VIRTUAL], ustick) == 0) 549 ksignal(p, SIGVTALRM); 550 if (timevalisset(&p->p_timer[ITIMER_PROF].it_value) && 551 itimerdecr(&p->p_timer[ITIMER_PROF], ustick) == 0) 552 ksignal(p, SIGPROF); 553 crit_exit_hard(); 554 lwkt_reltoken(&proc_token); 555 } 556 setdelayed(); 557 } 558 559 /* 560 * The statistics clock typically runs at a 125Hz rate, and is intended 561 * to be frequency offset from the hardclock (typ 100Hz). It is per-cpu. 562 * 563 * NOTE! systimer! the MP lock might not be held here. We can only safely 564 * manipulate objects owned by the current cpu. 565 * 566 * The stats clock is responsible for grabbing a profiling sample. 567 * Most of the statistics are only used by user-level statistics programs. 568 * The main exceptions are p->p_uticks, p->p_sticks, p->p_iticks, and 569 * p->p_estcpu. 570 * 571 * Like the other clocks, the stat clock is called from what is effectively 572 * a fast interrupt, so the context should be the thread/process that got 573 * interrupted. 574 */ 575 static void 576 statclock(systimer_t info, struct intrframe *frame) 577 { 578 #ifdef GPROF 579 struct gmonparam *g; 580 int i; 581 #endif 582 thread_t td; 583 struct proc *p; 584 int bump; 585 struct timeval tv; 586 struct timeval *stv; 587 588 /* 589 * How big was our timeslice relative to the last time? 590 */ 591 microuptime(&tv); /* mpsafe */ 592 stv = &mycpu->gd_stattv; 593 if (stv->tv_sec == 0) { 594 bump = 1; 595 } else { 596 bump = tv.tv_usec - stv->tv_usec + 597 (tv.tv_sec - stv->tv_sec) * 1000000; 598 if (bump < 0) 599 bump = 0; 600 if (bump > 1000000) 601 bump = 1000000; 602 } 603 *stv = tv; 604 605 td = curthread; 606 p = td->td_proc; 607 608 if (frame && CLKF_USERMODE(frame)) { 609 /* 610 * Came from userland, handle user time and deal with 611 * possible process. 612 */ 613 if (p && (p->p_flag & P_PROFIL)) 614 addupc_intr(p, CLKF_PC(frame), 1); 615 td->td_uticks += bump; 616 617 /* 618 * Charge the time as appropriate 619 */ 620 if (p && p->p_nice > NZERO) 621 cpu_time.cp_nice += bump; 622 else 623 cpu_time.cp_user += bump; 624 } else { 625 #ifdef GPROF 626 /* 627 * Kernel statistics are just like addupc_intr, only easier. 628 */ 629 g = &_gmonparam; 630 if (g->state == GMON_PROF_ON && frame) { 631 i = CLKF_PC(frame) - g->lowpc; 632 if (i < g->textsize) { 633 i /= HISTFRACTION * sizeof(*g->kcount); 634 g->kcount[i]++; 635 } 636 } 637 #endif 638 /* 639 * Came from kernel mode, so we were: 640 * - handling an interrupt, 641 * - doing syscall or trap work on behalf of the current 642 * user process, or 643 * - spinning in the idle loop. 644 * Whichever it is, charge the time as appropriate. 645 * Note that we charge interrupts to the current process, 646 * regardless of whether they are ``for'' that process, 647 * so that we know how much of its real time was spent 648 * in ``non-process'' (i.e., interrupt) work. 649 * 650 * XXX assume system if frame is NULL. A NULL frame 651 * can occur if ipi processing is done from a crit_exit(). 652 */ 653 if (frame && CLKF_INTR(frame)) 654 td->td_iticks += bump; 655 else 656 td->td_sticks += bump; 657 658 if (frame && CLKF_INTR(frame)) { 659 #ifdef DEBUG_PCTRACK 660 do_pctrack(frame, PCTRACK_INT); 661 #endif 662 cpu_time.cp_intr += bump; 663 } else { 664 if (td == &mycpu->gd_idlethread) { 665 cpu_time.cp_idle += bump; 666 } else { 667 #ifdef DEBUG_PCTRACK 668 if (frame) 669 do_pctrack(frame, PCTRACK_SYS); 670 #endif 671 cpu_time.cp_sys += bump; 672 } 673 } 674 } 675 } 676 677 #ifdef DEBUG_PCTRACK 678 /* 679 * Sample the PC when in the kernel or in an interrupt. User code can 680 * retrieve the information and generate a histogram or other output. 681 */ 682 683 static void 684 do_pctrack(struct intrframe *frame, int which) 685 { 686 struct kinfo_pctrack *pctrack; 687 688 pctrack = &cputime_pctrack[mycpu->gd_cpuid][which]; 689 pctrack->pc_array[pctrack->pc_index & PCTRACK_ARYMASK] = 690 (void *)CLKF_PC(frame); 691 ++pctrack->pc_index; 692 } 693 694 static int 695 sysctl_pctrack(SYSCTL_HANDLER_ARGS) 696 { 697 struct kinfo_pcheader head; 698 int error; 699 int cpu; 700 int ntrack; 701 702 head.pc_ntrack = PCTRACK_SIZE; 703 head.pc_arysize = PCTRACK_ARYSIZE; 704 705 if ((error = SYSCTL_OUT(req, &head, sizeof(head))) != 0) 706 return (error); 707 708 for (cpu = 0; cpu < ncpus; ++cpu) { 709 for (ntrack = 0; ntrack < PCTRACK_SIZE; ++ntrack) { 710 error = SYSCTL_OUT(req, &cputime_pctrack[cpu][ntrack], 711 sizeof(struct kinfo_pctrack)); 712 if (error) 713 break; 714 } 715 if (error) 716 break; 717 } 718 return (error); 719 } 720 SYSCTL_PROC(_kern, OID_AUTO, pctrack, (CTLTYPE_OPAQUE|CTLFLAG_RD), 0, 0, 721 sysctl_pctrack, "S,kinfo_pcheader", "CPU PC tracking"); 722 723 #endif 724 725 /* 726 * The scheduler clock typically runs at a 50Hz rate. NOTE! systimer, 727 * the MP lock might not be held. We can safely manipulate parts of curproc 728 * but that's about it. 729 * 730 * Each cpu has its own scheduler clock. 731 */ 732 static void 733 schedclock(systimer_t info, struct intrframe *frame) 734 { 735 struct lwp *lp; 736 struct rusage *ru; 737 struct vmspace *vm; 738 long rss; 739 740 if ((lp = lwkt_preempted_proc()) != NULL) { 741 /* 742 * Account for cpu time used and hit the scheduler. Note 743 * that this call MUST BE MP SAFE, and the BGL IS NOT HELD 744 * HERE. 745 */ 746 ++lp->lwp_cpticks; 747 lp->lwp_proc->p_usched->schedulerclock(lp, info->periodic, 748 info->time); 749 } 750 if ((lp = curthread->td_lwp) != NULL) { 751 /* 752 * Update resource usage integrals and maximums. 753 */ 754 if ((ru = &lp->lwp_proc->p_ru) && 755 (vm = lp->lwp_proc->p_vmspace) != NULL) { 756 ru->ru_ixrss += pgtok(vm->vm_tsize); 757 ru->ru_idrss += pgtok(vm->vm_dsize); 758 ru->ru_isrss += pgtok(vm->vm_ssize); 759 rss = pgtok(vmspace_resident_count(vm)); 760 if (ru->ru_maxrss < rss) 761 ru->ru_maxrss = rss; 762 } 763 } 764 } 765 766 /* 767 * Compute number of ticks for the specified amount of time. The 768 * return value is intended to be used in a clock interrupt timed 769 * operation and guarenteed to meet or exceed the requested time. 770 * If the representation overflows, return INT_MAX. The minimum return 771 * value is 1 ticks and the function will average the calculation up. 772 * If any value greater then 0 microseconds is supplied, a value 773 * of at least 2 will be returned to ensure that a near-term clock 774 * interrupt does not cause the timeout to occur (degenerately) early. 775 * 776 * Note that limit checks must take into account microseconds, which is 777 * done simply by using the smaller signed long maximum instead of 778 * the unsigned long maximum. 779 * 780 * If ints have 32 bits, then the maximum value for any timeout in 781 * 10ms ticks is 248 days. 782 */ 783 int 784 tvtohz_high(struct timeval *tv) 785 { 786 int ticks; 787 long sec, usec; 788 789 sec = tv->tv_sec; 790 usec = tv->tv_usec; 791 if (usec < 0) { 792 sec--; 793 usec += 1000000; 794 } 795 if (sec < 0) { 796 #ifdef DIAGNOSTIC 797 if (usec > 0) { 798 sec++; 799 usec -= 1000000; 800 } 801 kprintf("tvtohz_high: negative time difference " 802 "%ld sec %ld usec\n", 803 sec, usec); 804 #endif 805 ticks = 1; 806 } else if (sec <= INT_MAX / hz) { 807 ticks = (int)(sec * hz + 808 ((u_long)usec + (ustick - 1)) / ustick) + 1; 809 } else { 810 ticks = INT_MAX; 811 } 812 return (ticks); 813 } 814 815 int 816 tstohz_high(struct timespec *ts) 817 { 818 int ticks; 819 long sec, nsec; 820 821 sec = ts->tv_sec; 822 nsec = ts->tv_nsec; 823 if (nsec < 0) { 824 sec--; 825 nsec += 1000000000; 826 } 827 if (sec < 0) { 828 #ifdef DIAGNOSTIC 829 if (nsec > 0) { 830 sec++; 831 nsec -= 1000000000; 832 } 833 kprintf("tstohz_high: negative time difference " 834 "%ld sec %ld nsec\n", 835 sec, nsec); 836 #endif 837 ticks = 1; 838 } else if (sec <= INT_MAX / hz) { 839 ticks = (int)(sec * hz + 840 ((u_long)nsec + (nstick - 1)) / nstick) + 1; 841 } else { 842 ticks = INT_MAX; 843 } 844 return (ticks); 845 } 846 847 848 /* 849 * Compute number of ticks for the specified amount of time, erroring on 850 * the side of it being too low to ensure that sleeping the returned number 851 * of ticks will not result in a late return. 852 * 853 * The supplied timeval may not be negative and should be normalized. A 854 * return value of 0 is possible if the timeval converts to less then 855 * 1 tick. 856 * 857 * If ints have 32 bits, then the maximum value for any timeout in 858 * 10ms ticks is 248 days. 859 */ 860 int 861 tvtohz_low(struct timeval *tv) 862 { 863 int ticks; 864 long sec; 865 866 sec = tv->tv_sec; 867 if (sec <= INT_MAX / hz) 868 ticks = (int)(sec * hz + (u_long)tv->tv_usec / ustick); 869 else 870 ticks = INT_MAX; 871 return (ticks); 872 } 873 874 int 875 tstohz_low(struct timespec *ts) 876 { 877 int ticks; 878 long sec; 879 880 sec = ts->tv_sec; 881 if (sec <= INT_MAX / hz) 882 ticks = (int)(sec * hz + (u_long)ts->tv_nsec / nstick); 883 else 884 ticks = INT_MAX; 885 return (ticks); 886 } 887 888 /* 889 * Start profiling on a process. 890 * 891 * Kernel profiling passes proc0 which never exits and hence 892 * keeps the profile clock running constantly. 893 */ 894 void 895 startprofclock(struct proc *p) 896 { 897 if ((p->p_flag & P_PROFIL) == 0) { 898 p->p_flag |= P_PROFIL; 899 #if 0 /* XXX */ 900 if (++profprocs == 1 && stathz != 0) { 901 crit_enter(); 902 psdiv = psratio; 903 setstatclockrate(profhz); 904 crit_exit(); 905 } 906 #endif 907 } 908 } 909 910 /* 911 * Stop profiling on a process. 912 */ 913 void 914 stopprofclock(struct proc *p) 915 { 916 if (p->p_flag & P_PROFIL) { 917 p->p_flag &= ~P_PROFIL; 918 #if 0 /* XXX */ 919 if (--profprocs == 0 && stathz != 0) { 920 crit_enter(); 921 psdiv = 1; 922 setstatclockrate(stathz); 923 crit_exit(); 924 } 925 #endif 926 } 927 } 928 929 /* 930 * Return information about system clocks. 931 */ 932 static int 933 sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS) 934 { 935 struct kinfo_clockinfo clkinfo; 936 /* 937 * Construct clockinfo structure. 938 */ 939 clkinfo.ci_hz = hz; 940 clkinfo.ci_tick = ustick; 941 clkinfo.ci_tickadj = ntp_default_tick_delta / 1000; 942 clkinfo.ci_profhz = profhz; 943 clkinfo.ci_stathz = stathz ? stathz : hz; 944 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req)); 945 } 946 947 SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD, 948 0, 0, sysctl_kern_clockrate, "S,clockinfo",""); 949 950 /* 951 * We have eight functions for looking at the clock, four for 952 * microseconds and four for nanoseconds. For each there is fast 953 * but less precise version "get{nano|micro}[up]time" which will 954 * return a time which is up to 1/HZ previous to the call, whereas 955 * the raw version "{nano|micro}[up]time" will return a timestamp 956 * which is as precise as possible. The "up" variants return the 957 * time relative to system boot, these are well suited for time 958 * interval measurements. 959 * 960 * Each cpu independantly maintains the current time of day, so all 961 * we need to do to protect ourselves from changes is to do a loop 962 * check on the seconds field changing out from under us. 963 * 964 * The system timer maintains a 32 bit count and due to various issues 965 * it is possible for the calculated delta to occassionally exceed 966 * sys_cputimer->freq. If this occurs the sys_cputimer->freq64_nsec 967 * multiplication can easily overflow, so we deal with the case. For 968 * uniformity we deal with the case in the usec case too. 969 * 970 * All the [get][micro,nano][time,uptime]() routines are MPSAFE. 971 */ 972 void 973 getmicrouptime(struct timeval *tvp) 974 { 975 struct globaldata *gd = mycpu; 976 sysclock_t delta; 977 978 do { 979 tvp->tv_sec = gd->gd_time_seconds; 980 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 981 } while (tvp->tv_sec != gd->gd_time_seconds); 982 983 if (delta >= sys_cputimer->freq) { 984 tvp->tv_sec += delta / sys_cputimer->freq; 985 delta %= sys_cputimer->freq; 986 } 987 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32; 988 if (tvp->tv_usec >= 1000000) { 989 tvp->tv_usec -= 1000000; 990 ++tvp->tv_sec; 991 } 992 } 993 994 void 995 getnanouptime(struct timespec *tsp) 996 { 997 struct globaldata *gd = mycpu; 998 sysclock_t delta; 999 1000 do { 1001 tsp->tv_sec = gd->gd_time_seconds; 1002 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 1003 } while (tsp->tv_sec != gd->gd_time_seconds); 1004 1005 if (delta >= sys_cputimer->freq) { 1006 tsp->tv_sec += delta / sys_cputimer->freq; 1007 delta %= sys_cputimer->freq; 1008 } 1009 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32; 1010 } 1011 1012 void 1013 microuptime(struct timeval *tvp) 1014 { 1015 struct globaldata *gd = mycpu; 1016 sysclock_t delta; 1017 1018 do { 1019 tvp->tv_sec = gd->gd_time_seconds; 1020 delta = sys_cputimer->count() - gd->gd_cpuclock_base; 1021 } while (tvp->tv_sec != gd->gd_time_seconds); 1022 1023 if (delta >= sys_cputimer->freq) { 1024 tvp->tv_sec += delta / sys_cputimer->freq; 1025 delta %= sys_cputimer->freq; 1026 } 1027 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32; 1028 } 1029 1030 void 1031 nanouptime(struct timespec *tsp) 1032 { 1033 struct globaldata *gd = mycpu; 1034 sysclock_t delta; 1035 1036 do { 1037 tsp->tv_sec = gd->gd_time_seconds; 1038 delta = sys_cputimer->count() - gd->gd_cpuclock_base; 1039 } while (tsp->tv_sec != gd->gd_time_seconds); 1040 1041 if (delta >= sys_cputimer->freq) { 1042 tsp->tv_sec += delta / sys_cputimer->freq; 1043 delta %= sys_cputimer->freq; 1044 } 1045 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32; 1046 } 1047 1048 /* 1049 * realtime routines 1050 */ 1051 void 1052 getmicrotime(struct timeval *tvp) 1053 { 1054 struct globaldata *gd = mycpu; 1055 struct timespec *bt; 1056 sysclock_t delta; 1057 1058 do { 1059 tvp->tv_sec = gd->gd_time_seconds; 1060 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 1061 } while (tvp->tv_sec != gd->gd_time_seconds); 1062 1063 if (delta >= sys_cputimer->freq) { 1064 tvp->tv_sec += delta / sys_cputimer->freq; 1065 delta %= sys_cputimer->freq; 1066 } 1067 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32; 1068 1069 bt = &basetime[basetime_index]; 1070 tvp->tv_sec += bt->tv_sec; 1071 tvp->tv_usec += bt->tv_nsec / 1000; 1072 while (tvp->tv_usec >= 1000000) { 1073 tvp->tv_usec -= 1000000; 1074 ++tvp->tv_sec; 1075 } 1076 } 1077 1078 void 1079 getnanotime(struct timespec *tsp) 1080 { 1081 struct globaldata *gd = mycpu; 1082 struct timespec *bt; 1083 sysclock_t delta; 1084 1085 do { 1086 tsp->tv_sec = gd->gd_time_seconds; 1087 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 1088 } while (tsp->tv_sec != gd->gd_time_seconds); 1089 1090 if (delta >= sys_cputimer->freq) { 1091 tsp->tv_sec += delta / sys_cputimer->freq; 1092 delta %= sys_cputimer->freq; 1093 } 1094 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32; 1095 1096 bt = &basetime[basetime_index]; 1097 tsp->tv_sec += bt->tv_sec; 1098 tsp->tv_nsec += bt->tv_nsec; 1099 while (tsp->tv_nsec >= 1000000000) { 1100 tsp->tv_nsec -= 1000000000; 1101 ++tsp->tv_sec; 1102 } 1103 } 1104 1105 static void 1106 getnanotime_nbt(struct timespec *nbt, struct timespec *tsp) 1107 { 1108 struct globaldata *gd = mycpu; 1109 sysclock_t delta; 1110 1111 do { 1112 tsp->tv_sec = gd->gd_time_seconds; 1113 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base; 1114 } while (tsp->tv_sec != gd->gd_time_seconds); 1115 1116 if (delta >= sys_cputimer->freq) { 1117 tsp->tv_sec += delta / sys_cputimer->freq; 1118 delta %= sys_cputimer->freq; 1119 } 1120 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32; 1121 1122 tsp->tv_sec += nbt->tv_sec; 1123 tsp->tv_nsec += nbt->tv_nsec; 1124 while (tsp->tv_nsec >= 1000000000) { 1125 tsp->tv_nsec -= 1000000000; 1126 ++tsp->tv_sec; 1127 } 1128 } 1129 1130 1131 void 1132 microtime(struct timeval *tvp) 1133 { 1134 struct globaldata *gd = mycpu; 1135 struct timespec *bt; 1136 sysclock_t delta; 1137 1138 do { 1139 tvp->tv_sec = gd->gd_time_seconds; 1140 delta = sys_cputimer->count() - gd->gd_cpuclock_base; 1141 } while (tvp->tv_sec != gd->gd_time_seconds); 1142 1143 if (delta >= sys_cputimer->freq) { 1144 tvp->tv_sec += delta / sys_cputimer->freq; 1145 delta %= sys_cputimer->freq; 1146 } 1147 tvp->tv_usec = (sys_cputimer->freq64_usec * delta) >> 32; 1148 1149 bt = &basetime[basetime_index]; 1150 tvp->tv_sec += bt->tv_sec; 1151 tvp->tv_usec += bt->tv_nsec / 1000; 1152 while (tvp->tv_usec >= 1000000) { 1153 tvp->tv_usec -= 1000000; 1154 ++tvp->tv_sec; 1155 } 1156 } 1157 1158 void 1159 nanotime(struct timespec *tsp) 1160 { 1161 struct globaldata *gd = mycpu; 1162 struct timespec *bt; 1163 sysclock_t delta; 1164 1165 do { 1166 tsp->tv_sec = gd->gd_time_seconds; 1167 delta = sys_cputimer->count() - gd->gd_cpuclock_base; 1168 } while (tsp->tv_sec != gd->gd_time_seconds); 1169 1170 if (delta >= sys_cputimer->freq) { 1171 tsp->tv_sec += delta / sys_cputimer->freq; 1172 delta %= sys_cputimer->freq; 1173 } 1174 tsp->tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32; 1175 1176 bt = &basetime[basetime_index]; 1177 tsp->tv_sec += bt->tv_sec; 1178 tsp->tv_nsec += bt->tv_nsec; 1179 while (tsp->tv_nsec >= 1000000000) { 1180 tsp->tv_nsec -= 1000000000; 1181 ++tsp->tv_sec; 1182 } 1183 } 1184 1185 /* 1186 * note: this is not exactly synchronized with real time. To do that we 1187 * would have to do what microtime does and check for a nanoseconds overflow. 1188 */ 1189 time_t 1190 get_approximate_time_t(void) 1191 { 1192 struct globaldata *gd = mycpu; 1193 struct timespec *bt; 1194 1195 bt = &basetime[basetime_index]; 1196 return(gd->gd_time_seconds + bt->tv_sec); 1197 } 1198 1199 int 1200 pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps) 1201 { 1202 pps_params_t *app; 1203 struct pps_fetch_args *fapi; 1204 #ifdef PPS_SYNC 1205 struct pps_kcbind_args *kapi; 1206 #endif 1207 1208 switch (cmd) { 1209 case PPS_IOC_CREATE: 1210 return (0); 1211 case PPS_IOC_DESTROY: 1212 return (0); 1213 case PPS_IOC_SETPARAMS: 1214 app = (pps_params_t *)data; 1215 if (app->mode & ~pps->ppscap) 1216 return (EINVAL); 1217 pps->ppsparam = *app; 1218 return (0); 1219 case PPS_IOC_GETPARAMS: 1220 app = (pps_params_t *)data; 1221 *app = pps->ppsparam; 1222 app->api_version = PPS_API_VERS_1; 1223 return (0); 1224 case PPS_IOC_GETCAP: 1225 *(int*)data = pps->ppscap; 1226 return (0); 1227 case PPS_IOC_FETCH: 1228 fapi = (struct pps_fetch_args *)data; 1229 if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC) 1230 return (EINVAL); 1231 if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec) 1232 return (EOPNOTSUPP); 1233 pps->ppsinfo.current_mode = pps->ppsparam.mode; 1234 fapi->pps_info_buf = pps->ppsinfo; 1235 return (0); 1236 case PPS_IOC_KCBIND: 1237 #ifdef PPS_SYNC 1238 kapi = (struct pps_kcbind_args *)data; 1239 /* XXX Only root should be able to do this */ 1240 if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC) 1241 return (EINVAL); 1242 if (kapi->kernel_consumer != PPS_KC_HARDPPS) 1243 return (EINVAL); 1244 if (kapi->edge & ~pps->ppscap) 1245 return (EINVAL); 1246 pps->kcmode = kapi->edge; 1247 return (0); 1248 #else 1249 return (EOPNOTSUPP); 1250 #endif 1251 default: 1252 return (ENOTTY); 1253 } 1254 } 1255 1256 void 1257 pps_init(struct pps_state *pps) 1258 { 1259 pps->ppscap |= PPS_TSFMT_TSPEC; 1260 if (pps->ppscap & PPS_CAPTUREASSERT) 1261 pps->ppscap |= PPS_OFFSETASSERT; 1262 if (pps->ppscap & PPS_CAPTURECLEAR) 1263 pps->ppscap |= PPS_OFFSETCLEAR; 1264 } 1265 1266 void 1267 pps_event(struct pps_state *pps, sysclock_t count, int event) 1268 { 1269 struct globaldata *gd; 1270 struct timespec *tsp; 1271 struct timespec *osp; 1272 struct timespec *bt; 1273 struct timespec ts; 1274 sysclock_t *pcount; 1275 #ifdef PPS_SYNC 1276 sysclock_t tcount; 1277 #endif 1278 sysclock_t delta; 1279 pps_seq_t *pseq; 1280 int foff; 1281 int fhard; 1282 1283 gd = mycpu; 1284 1285 /* Things would be easier with arrays... */ 1286 if (event == PPS_CAPTUREASSERT) { 1287 tsp = &pps->ppsinfo.assert_timestamp; 1288 osp = &pps->ppsparam.assert_offset; 1289 foff = pps->ppsparam.mode & PPS_OFFSETASSERT; 1290 fhard = pps->kcmode & PPS_CAPTUREASSERT; 1291 pcount = &pps->ppscount[0]; 1292 pseq = &pps->ppsinfo.assert_sequence; 1293 } else { 1294 tsp = &pps->ppsinfo.clear_timestamp; 1295 osp = &pps->ppsparam.clear_offset; 1296 foff = pps->ppsparam.mode & PPS_OFFSETCLEAR; 1297 fhard = pps->kcmode & PPS_CAPTURECLEAR; 1298 pcount = &pps->ppscount[1]; 1299 pseq = &pps->ppsinfo.clear_sequence; 1300 } 1301 1302 /* Nothing really happened */ 1303 if (*pcount == count) 1304 return; 1305 1306 *pcount = count; 1307 1308 do { 1309 ts.tv_sec = gd->gd_time_seconds; 1310 delta = count - gd->gd_cpuclock_base; 1311 } while (ts.tv_sec != gd->gd_time_seconds); 1312 1313 if (delta >= sys_cputimer->freq) { 1314 ts.tv_sec += delta / sys_cputimer->freq; 1315 delta %= sys_cputimer->freq; 1316 } 1317 ts.tv_nsec = (sys_cputimer->freq64_nsec * delta) >> 32; 1318 bt = &basetime[basetime_index]; 1319 ts.tv_sec += bt->tv_sec; 1320 ts.tv_nsec += bt->tv_nsec; 1321 while (ts.tv_nsec >= 1000000000) { 1322 ts.tv_nsec -= 1000000000; 1323 ++ts.tv_sec; 1324 } 1325 1326 (*pseq)++; 1327 *tsp = ts; 1328 1329 if (foff) { 1330 timespecadd(tsp, osp); 1331 if (tsp->tv_nsec < 0) { 1332 tsp->tv_nsec += 1000000000; 1333 tsp->tv_sec -= 1; 1334 } 1335 } 1336 #ifdef PPS_SYNC 1337 if (fhard) { 1338 /* magic, at its best... */ 1339 tcount = count - pps->ppscount[2]; 1340 pps->ppscount[2] = count; 1341 if (tcount >= sys_cputimer->freq) { 1342 delta = (1000000000 * (tcount / sys_cputimer->freq) + 1343 sys_cputimer->freq64_nsec * 1344 (tcount % sys_cputimer->freq)) >> 32; 1345 } else { 1346 delta = (sys_cputimer->freq64_nsec * tcount) >> 32; 1347 } 1348 hardpps(tsp, delta); 1349 } 1350 #endif 1351 } 1352 1353 /* 1354 * Return the tsc target value for a delay of (ns). 1355 * 1356 * Returns -1 if the TSC is not supported. 1357 */ 1358 int64_t 1359 tsc_get_target(int ns) 1360 { 1361 #if defined(_RDTSC_SUPPORTED_) 1362 if (cpu_feature & CPUID_TSC) { 1363 return (rdtsc() + tsc_frequency * ns / (int64_t)1000000000); 1364 } 1365 #endif 1366 return(-1); 1367 } 1368 1369 /* 1370 * Compare the tsc against the passed target 1371 * 1372 * Returns +1 if the target has been reached 1373 * Returns 0 if the target has not yet been reached 1374 * Returns -1 if the TSC is not supported. 1375 * 1376 * Typical use: while (tsc_test_target(target) == 0) { ...poll... } 1377 */ 1378 int 1379 tsc_test_target(int64_t target) 1380 { 1381 #if defined(_RDTSC_SUPPORTED_) 1382 if (cpu_feature & CPUID_TSC) { 1383 if ((int64_t)(target - rdtsc()) <= 0) 1384 return(1); 1385 return(0); 1386 } 1387 #endif 1388 return(-1); 1389 } 1390