kern_clock.c (57182) | kern_clock.c (58377) |
---|---|
1/*- | 1/*- |
2 * Copyright (c) 1997, 1998 Poul-Henning Kamp <phk@FreeBSD.org> | |
3 * Copyright (c) 1982, 1986, 1991, 1993 4 * The Regents of the University of California. All rights reserved. 5 * (c) UNIX System Laboratories, Inc. 6 * All or some portions of this file are derived from material licensed 7 * to the University of California by American Telephone and Telegraph 8 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 9 * the permission of UNIX System Laboratories, Inc. 10 * --- 21 unchanged lines hidden (view full) --- 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)kern_clock.c 8.5 (Berkeley) 1/21/94 | 2 * Copyright (c) 1982, 1986, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * --- 21 unchanged lines hidden (view full) --- 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)kern_clock.c 8.5 (Berkeley) 1/21/94 |
40 * $FreeBSD: head/sys/kern/kern_clock.c 57182 2000-02-13 10:56:32Z phk $ | 39 * $FreeBSD: head/sys/kern/kern_clock.c 58377 2000-03-20 14:09:06Z phk $ |
41 */ 42 43#include "opt_ntp.h" 44 45#include <sys/param.h> 46#include <sys/systm.h> 47#include <sys/dkstat.h> 48#include <sys/callout.h> 49#include <sys/kernel.h> 50#include <sys/proc.h> 51#include <sys/malloc.h> 52#include <sys/resourcevar.h> 53#include <sys/signalvar.h> | 40 */ 41 42#include "opt_ntp.h" 43 44#include <sys/param.h> 45#include <sys/systm.h> 46#include <sys/dkstat.h> 47#include <sys/callout.h> 48#include <sys/kernel.h> 49#include <sys/proc.h> 50#include <sys/malloc.h> 51#include <sys/resourcevar.h> 52#include <sys/signalvar.h> |
54#include <sys/timex.h> | 53#include <sys/timetc.h> |
55#include <sys/timepps.h> 56#include <vm/vm.h> 57#include <sys/lock.h> 58#include <vm/pmap.h> 59#include <vm/vm_map.h> 60#include <sys/sysctl.h> 61 62#include <machine/cpu.h> 63#include <machine/limits.h> 64 65#ifdef GPROF 66#include <sys/gmon.h> 67#endif 68 69#if defined(SMP) && defined(BETTER_CLOCK) 70#include <machine/smp.h> 71#endif 72 | 54#include <sys/timepps.h> 55#include <vm/vm.h> 56#include <sys/lock.h> 57#include <vm/pmap.h> 58#include <vm/vm_map.h> 59#include <sys/sysctl.h> 60 61#include <machine/cpu.h> 62#include <machine/limits.h> 63 64#ifdef GPROF 65#include <sys/gmon.h> 66#endif 67 68#if defined(SMP) && defined(BETTER_CLOCK) 69#include <machine/smp.h> 70#endif 71 |
73/* 74 * Number of timecounters used to implement stable storage 75 */ 76#ifndef NTIMECOUNTER 77#define NTIMECOUNTER 5 78#endif 79 80static MALLOC_DEFINE(M_TIMECOUNTER, "timecounter", 81 "Timecounter stable storage"); 82 | |
83static void initclocks __P((void *dummy)); 84SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL) 85 | 72static void initclocks __P((void *dummy)); 73SYSINIT(clocks, SI_SUB_CLOCKS, SI_ORDER_FIRST, initclocks, NULL) 74 |
86static void tco_forward __P((int force)); 87static void tco_setscales __P((struct timecounter *tc)); 88static __inline unsigned tco_delta __P((struct timecounter *tc)); 89 | |
90/* Some of these don't belong here, but it's easiest to concentrate them. */ 91#if defined(SMP) && defined(BETTER_CLOCK) 92long cp_time[CPUSTATES]; 93#else 94static long cp_time[CPUSTATES]; 95#endif 96 97long tk_cancc; 98long tk_nin; 99long tk_nout; 100long tk_rawcc; 101 | 75/* Some of these don't belong here, but it's easiest to concentrate them. */ 76#if defined(SMP) && defined(BETTER_CLOCK) 77long cp_time[CPUSTATES]; 78#else 79static long cp_time[CPUSTATES]; 80#endif 81 82long tk_cancc; 83long tk_nin; 84long tk_nout; 85long tk_rawcc; 86 |
102time_t time_second; 103 104struct timeval boottime; 105SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD, 106 &boottime, timeval, "System boottime"); 107 | |
108/* | 87/* |
109 * Which update policy to use. 110 * 0 - every tick, bad hardware may fail with "calcru negative..." 111 * 1 - more resistent to the above hardware, but less efficient. 112 */ 113static int tco_method; 114 115/* 116 * Implement a dummy timecounter which we can use until we get a real one 117 * in the air. This allows the console and other early stuff to use 118 * timeservices. 119 */ 120 121static unsigned 122dummy_get_timecount(struct timecounter *tc) 123{ 124 static unsigned now; 125 return (++now); 126} 127 128static struct timecounter dummy_timecounter = { 129 dummy_get_timecount, 130 0, 131 ~0u, 132 1000000, 133 "dummy" 134}; 135 136struct timecounter *timecounter = &dummy_timecounter; 137 138/* | |
139 * Clock handling routines. 140 * 141 * This code is written to operate with two timers that run independently of 142 * each other. 143 * 144 * The main timer, running hz times per second, is used to trigger interval 145 * timers, timeouts and rescheduling as needed. 146 * --- 84 unchanged lines hidden (view full) --- 231#endif 232 233 /* 234 * If no separate statistics clock is available, run it from here. 235 */ 236 if (stathz == 0) 237 statclock(frame); 238 | 88 * Clock handling routines. 89 * 90 * This code is written to operate with two timers that run independently of 91 * each other. 92 * 93 * The main timer, running hz times per second, is used to trigger interval 94 * timers, timeouts and rescheduling as needed. 95 * --- 84 unchanged lines hidden (view full) --- 180#endif 181 182 /* 183 * If no separate statistics clock is available, run it from here. 184 */ 185 if (stathz == 0) 186 statclock(frame); 187 |
239 tco_forward(0); | 188 tc_windup(); |
240 ticks++; 241 242 /* 243 * Process callouts at a very low cpu priority, so we don't keep the 244 * relatively high clock interrupt priority any longer than necessary. 245 */ 246 if (TAILQ_FIRST(&callwheel[ticks & callwheelmask]) != NULL) { 247 if (CLKF_BASEPRI(frame)) { --- 230 unchanged lines hidden (view full) --- 478 clkinfo.tickadj = tickadj; 479 clkinfo.profhz = profhz; 480 clkinfo.stathz = stathz ? stathz : hz; 481 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req)); 482} 483 484SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD, 485 0, 0, sysctl_kern_clockrate, "S,clockinfo",""); | 189 ticks++; 190 191 /* 192 * Process callouts at a very low cpu priority, so we don't keep the 193 * relatively high clock interrupt priority any longer than necessary. 194 */ 195 if (TAILQ_FIRST(&callwheel[ticks & callwheelmask]) != NULL) { 196 if (CLKF_BASEPRI(frame)) { --- 230 unchanged lines hidden (view full) --- 427 clkinfo.tickadj = tickadj; 428 clkinfo.profhz = profhz; 429 clkinfo.stathz = stathz ? stathz : hz; 430 return (sysctl_handle_opaque(oidp, &clkinfo, sizeof clkinfo, req)); 431} 432 433SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD, 434 0, 0, sysctl_kern_clockrate, "S,clockinfo",""); |
486 487static __inline unsigned 488tco_delta(struct timecounter *tc) 489{ 490 491 return ((tc->tc_get_timecount(tc) - tc->tc_offset_count) & 492 tc->tc_counter_mask); 493} 494 495/* 496 * We have eight functions for looking at the clock, four for 497 * microseconds and four for nanoseconds. For each there is fast 498 * but less precise version "get{nano|micro}[up]time" which will 499 * return a time which is up to 1/HZ previous to the call, whereas 500 * the raw version "{nano|micro}[up]time" will return a timestamp 501 * which is as precise as possible. The "up" variants return the 502 * time relative to system boot, these are well suited for time 503 * interval measurements. 504 */ 505 506void 507getmicrotime(struct timeval *tvp) 508{ 509 struct timecounter *tc; 510 511 if (!tco_method) { 512 tc = timecounter; 513 *tvp = tc->tc_microtime; 514 } else { 515 microtime(tvp); 516 } 517} 518 519void 520getnanotime(struct timespec *tsp) 521{ 522 struct timecounter *tc; 523 524 if (!tco_method) { 525 tc = timecounter; 526 *tsp = tc->tc_nanotime; 527 } else { 528 nanotime(tsp); 529 } 530} 531 532void 533microtime(struct timeval *tv) 534{ 535 struct timecounter *tc; 536 537 tc = timecounter; 538 tv->tv_sec = tc->tc_offset_sec; 539 tv->tv_usec = tc->tc_offset_micro; 540 tv->tv_usec += ((u_int64_t)tco_delta(tc) * tc->tc_scale_micro) >> 32; 541 tv->tv_usec += boottime.tv_usec; 542 tv->tv_sec += boottime.tv_sec; 543 while (tv->tv_usec >= 1000000) { 544 tv->tv_usec -= 1000000; 545 tv->tv_sec++; 546 } 547} 548 549void 550nanotime(struct timespec *ts) 551{ 552 unsigned count; 553 u_int64_t delta; 554 struct timecounter *tc; 555 556 tc = timecounter; 557 ts->tv_sec = tc->tc_offset_sec; 558 count = tco_delta(tc); 559 delta = tc->tc_offset_nano; 560 delta += ((u_int64_t)count * tc->tc_scale_nano_f); 561 delta >>= 32; 562 delta += ((u_int64_t)count * tc->tc_scale_nano_i); 563 delta += boottime.tv_usec * 1000; 564 ts->tv_sec += boottime.tv_sec; 565 while (delta >= 1000000000) { 566 delta -= 1000000000; 567 ts->tv_sec++; 568 } 569 ts->tv_nsec = delta; 570} 571 572void 573getmicrouptime(struct timeval *tvp) 574{ 575 struct timecounter *tc; 576 577 if (!tco_method) { 578 tc = timecounter; 579 tvp->tv_sec = tc->tc_offset_sec; 580 tvp->tv_usec = tc->tc_offset_micro; 581 } else { 582 microuptime(tvp); 583 } 584} 585 586void 587getnanouptime(struct timespec *tsp) 588{ 589 struct timecounter *tc; 590 591 if (!tco_method) { 592 tc = timecounter; 593 tsp->tv_sec = tc->tc_offset_sec; 594 tsp->tv_nsec = tc->tc_offset_nano >> 32; 595 } else { 596 nanouptime(tsp); 597 } 598} 599 600void 601microuptime(struct timeval *tv) 602{ 603 struct timecounter *tc; 604 605 tc = timecounter; 606 tv->tv_sec = tc->tc_offset_sec; 607 tv->tv_usec = tc->tc_offset_micro; 608 tv->tv_usec += ((u_int64_t)tco_delta(tc) * tc->tc_scale_micro) >> 32; 609 if (tv->tv_usec >= 1000000) { 610 tv->tv_usec -= 1000000; 611 tv->tv_sec++; 612 } 613} 614 615void 616nanouptime(struct timespec *ts) 617{ 618 unsigned count; 619 u_int64_t delta; 620 struct timecounter *tc; 621 622 tc = timecounter; 623 ts->tv_sec = tc->tc_offset_sec; 624 count = tco_delta(tc); 625 delta = tc->tc_offset_nano; 626 delta += ((u_int64_t)count * tc->tc_scale_nano_f); 627 delta >>= 32; 628 delta += ((u_int64_t)count * tc->tc_scale_nano_i); 629 if (delta >= 1000000000) { 630 delta -= 1000000000; 631 ts->tv_sec++; 632 } 633 ts->tv_nsec = delta; 634} 635 636static void 637tco_setscales(struct timecounter *tc) 638{ 639 u_int64_t scale; 640 641 scale = 1000000000LL << 32; 642 scale += tc->tc_adjustment; 643 scale /= tc->tc_tweak->tc_frequency; 644 tc->tc_scale_micro = scale / 1000; 645 tc->tc_scale_nano_f = scale & 0xffffffff; 646 tc->tc_scale_nano_i = scale >> 32; 647} 648 649void 650update_timecounter(struct timecounter *tc) 651{ 652 tco_setscales(tc); 653} 654 655void 656init_timecounter(struct timecounter *tc) 657{ 658 struct timespec ts1; 659 struct timecounter *t1, *t2, *t3; 660 int i; 661 662 tc->tc_adjustment = 0; 663 tc->tc_tweak = tc; 664 tco_setscales(tc); 665 tc->tc_offset_count = tc->tc_get_timecount(tc); 666 if (timecounter == &dummy_timecounter) 667 tc->tc_avail = tc; 668 else { 669 tc->tc_avail = timecounter->tc_tweak->tc_avail; 670 timecounter->tc_tweak->tc_avail = tc; 671 } 672 MALLOC(t1, struct timecounter *, sizeof *t1, M_TIMECOUNTER, M_WAITOK); 673 tc->tc_other = t1; 674 *t1 = *tc; 675 t2 = t1; 676 for (i = 1; i < NTIMECOUNTER; i++) { 677 MALLOC(t3, struct timecounter *, sizeof *t3, 678 M_TIMECOUNTER, M_WAITOK); 679 *t3 = *tc; 680 t3->tc_other = t2; 681 t2 = t3; 682 } 683 t1->tc_other = t3; 684 tc = t1; 685 686 printf("Timecounter \"%s\" frequency %lu Hz\n", 687 tc->tc_name, (u_long)tc->tc_frequency); 688 689 /* XXX: For now always start using the counter. */ 690 tc->tc_offset_count = tc->tc_get_timecount(tc); 691 nanouptime(&ts1); 692 tc->tc_offset_nano = (u_int64_t)ts1.tv_nsec << 32; 693 tc->tc_offset_micro = ts1.tv_nsec / 1000; 694 tc->tc_offset_sec = ts1.tv_sec; 695 timecounter = tc; 696} 697 698void 699set_timecounter(struct timespec *ts) 700{ 701 struct timespec ts2; 702 703 nanouptime(&ts2); 704 boottime.tv_sec = ts->tv_sec - ts2.tv_sec; 705 boottime.tv_usec = (ts->tv_nsec - ts2.tv_nsec) / 1000; 706 if (boottime.tv_usec < 0) { 707 boottime.tv_usec += 1000000; 708 boottime.tv_sec--; 709 } 710 /* fiddle all the little crinkly bits around the fiords... */ 711 tco_forward(1); 712} 713 714static void 715switch_timecounter(struct timecounter *newtc) 716{ 717 int s; 718 struct timecounter *tc; 719 struct timespec ts; 720 721 s = splclock(); 722 tc = timecounter; 723 if (newtc->tc_tweak == tc->tc_tweak) { 724 splx(s); 725 return; 726 } 727 newtc = newtc->tc_tweak->tc_other; 728 nanouptime(&ts); 729 newtc->tc_offset_sec = ts.tv_sec; 730 newtc->tc_offset_nano = (u_int64_t)ts.tv_nsec << 32; 731 newtc->tc_offset_micro = ts.tv_nsec / 1000; 732 newtc->tc_offset_count = newtc->tc_get_timecount(newtc); 733 tco_setscales(newtc); 734 timecounter = newtc; 735 splx(s); 736} 737 738static struct timecounter * 739sync_other_counter(void) 740{ 741 struct timecounter *tc, *tcn, *tco; 742 unsigned delta; 743 744 tco = timecounter; 745 tc = tco->tc_other; 746 tcn = tc->tc_other; 747 *tc = *tco; 748 tc->tc_other = tcn; 749 delta = tco_delta(tc); 750 tc->tc_offset_count += delta; 751 tc->tc_offset_count &= tc->tc_counter_mask; 752 tc->tc_offset_nano += (u_int64_t)delta * tc->tc_scale_nano_f; 753 tc->tc_offset_nano += (u_int64_t)delta * tc->tc_scale_nano_i << 32; 754 return (tc); 755} 756 757static void 758tco_forward(int force) 759{ 760 struct timecounter *tc, *tco; 761 struct timeval tvt; 762 763 tco = timecounter; 764 tc = sync_other_counter(); 765 /* 766 * We may be inducing a tiny error here, the tc_poll_pps() may 767 * process a latched count which happens after the tco_delta() 768 * in sync_other_counter(), which would extend the previous 769 * counters parameters into the domain of this new one. 770 * Since the timewindow is very small for this, the error is 771 * going to be only a few weenieseconds (as Dave Mills would 772 * say), so lets just not talk more about it, OK ? 773 */ 774 if (tco->tc_poll_pps) 775 tco->tc_poll_pps(tco); 776 if (timedelta != 0) { 777 tvt = boottime; 778 tvt.tv_usec += tickdelta; 779 if (tvt.tv_usec >= 1000000) { 780 tvt.tv_sec++; 781 tvt.tv_usec -= 1000000; 782 } else if (tvt.tv_usec < 0) { 783 tvt.tv_sec--; 784 tvt.tv_usec += 1000000; 785 } 786 boottime = tvt; 787 timedelta -= tickdelta; 788 } 789 790 while (tc->tc_offset_nano >= 1000000000ULL << 32) { 791 tc->tc_offset_nano -= 1000000000ULL << 32; 792 tc->tc_offset_sec++; 793 ntp_update_second(tc); /* XXX only needed if xntpd runs */ 794 tco_setscales(tc); 795 force++; 796 } 797 798 if (tco_method && !force) 799 return; 800 801 tc->tc_offset_micro = (tc->tc_offset_nano / 1000) >> 32; 802 803 /* Figure out the wall-clock time */ 804 tc->tc_nanotime.tv_sec = tc->tc_offset_sec + boottime.tv_sec; 805 tc->tc_nanotime.tv_nsec = 806 (tc->tc_offset_nano >> 32) + boottime.tv_usec * 1000; 807 tc->tc_microtime.tv_usec = tc->tc_offset_micro + boottime.tv_usec; 808 if (tc->tc_nanotime.tv_nsec >= 1000000000) { 809 tc->tc_nanotime.tv_nsec -= 1000000000; 810 tc->tc_microtime.tv_usec -= 1000000; 811 tc->tc_nanotime.tv_sec++; 812 } 813 time_second = tc->tc_microtime.tv_sec = tc->tc_nanotime.tv_sec; 814 815 timecounter = tc; 816} 817 818SYSCTL_NODE(_kern, OID_AUTO, timecounter, CTLFLAG_RW, 0, ""); 819 820SYSCTL_INT(_kern_timecounter, OID_AUTO, method, CTLFLAG_RW, &tco_method, 0, 821 "This variable determines the method used for updating timecounters. " 822 "If the default algorithm (0) fails with \"calcru negative...\" messages " 823 "try the alternate algorithm (1) which handles bad hardware better." 824 825); 826 827static int 828sysctl_kern_timecounter_hardware SYSCTL_HANDLER_ARGS 829{ 830 char newname[32]; 831 struct timecounter *newtc, *tc; 832 int error; 833 834 tc = timecounter->tc_tweak; 835 strncpy(newname, tc->tc_name, sizeof(newname)); 836 error = sysctl_handle_string(oidp, &newname[0], sizeof(newname), req); 837 if (error == 0 && req->newptr != NULL && 838 strcmp(newname, tc->tc_name) != 0) { 839 for (newtc = tc->tc_avail; newtc != tc; 840 newtc = newtc->tc_avail) { 841 if (strcmp(newname, newtc->tc_name) == 0) { 842 /* Warm up new timecounter. */ 843 (void)newtc->tc_get_timecount(newtc); 844 845 switch_timecounter(newtc); 846 return (0); 847 } 848 } 849 return (EINVAL); 850 } 851 return (error); 852} 853 854SYSCTL_PROC(_kern_timecounter, OID_AUTO, hardware, CTLTYPE_STRING | CTLFLAG_RW, 855 0, 0, sysctl_kern_timecounter_hardware, "A", ""); 856 857 858int 859pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps) 860{ 861 pps_params_t *app; 862 struct pps_fetch_args *fapi; 863#ifdef PPS_SYNC 864 struct pps_kcbind_args *kapi; 865#endif 866 867 switch (cmd) { 868 case PPS_IOC_CREATE: 869 return (0); 870 case PPS_IOC_DESTROY: 871 return (0); 872 case PPS_IOC_SETPARAMS: 873 app = (pps_params_t *)data; 874 if (app->mode & ~pps->ppscap) 875 return (EINVAL); 876 pps->ppsparam = *app; 877 return (0); 878 case PPS_IOC_GETPARAMS: 879 app = (pps_params_t *)data; 880 *app = pps->ppsparam; 881 app->api_version = PPS_API_VERS_1; 882 return (0); 883 case PPS_IOC_GETCAP: 884 *(int*)data = pps->ppscap; 885 return (0); 886 case PPS_IOC_FETCH: 887 fapi = (struct pps_fetch_args *)data; 888 if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC) 889 return (EINVAL); 890 if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec) 891 return (EOPNOTSUPP); 892 pps->ppsinfo.current_mode = pps->ppsparam.mode; 893 fapi->pps_info_buf = pps->ppsinfo; 894 return (0); 895 case PPS_IOC_KCBIND: 896#ifdef PPS_SYNC 897 kapi = (struct pps_kcbind_args *)data; 898 /* XXX Only root should be able to do this */ 899 if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC) 900 return (EINVAL); 901 if (kapi->kernel_consumer != PPS_KC_HARDPPS) 902 return (EINVAL); 903 if (kapi->edge & ~pps->ppscap) 904 return (EINVAL); 905 pps->kcmode = kapi->edge; 906 return (0); 907#else 908 return (EOPNOTSUPP); 909#endif 910 default: 911 return (ENOTTY); 912 } 913} 914 915void 916pps_init(struct pps_state *pps) 917{ 918 pps->ppscap |= PPS_TSFMT_TSPEC; 919 if (pps->ppscap & PPS_CAPTUREASSERT) 920 pps->ppscap |= PPS_OFFSETASSERT; 921 if (pps->ppscap & PPS_CAPTURECLEAR) 922 pps->ppscap |= PPS_OFFSETCLEAR; 923} 924 925void 926pps_event(struct pps_state *pps, struct timecounter *tc, unsigned count, int event) 927{ 928 struct timespec ts, *tsp, *osp; 929 u_int64_t delta; 930 unsigned tcount, *pcount; 931 int foff, fhard; 932 pps_seq_t *pseq; 933 934 /* Things would be easier with arrays... */ 935 if (event == PPS_CAPTUREASSERT) { 936 tsp = &pps->ppsinfo.assert_timestamp; 937 osp = &pps->ppsparam.assert_offset; 938 foff = pps->ppsparam.mode & PPS_OFFSETASSERT; 939 fhard = pps->kcmode & PPS_CAPTUREASSERT; 940 pcount = &pps->ppscount[0]; 941 pseq = &pps->ppsinfo.assert_sequence; 942 } else { 943 tsp = &pps->ppsinfo.clear_timestamp; 944 osp = &pps->ppsparam.clear_offset; 945 foff = pps->ppsparam.mode & PPS_OFFSETCLEAR; 946 fhard = pps->kcmode & PPS_CAPTURECLEAR; 947 pcount = &pps->ppscount[1]; 948 pseq = &pps->ppsinfo.clear_sequence; 949 } 950 951 /* The timecounter changed: bail */ 952 if (!pps->ppstc || 953 pps->ppstc->tc_name != tc->tc_name || 954 tc->tc_name != timecounter->tc_name) { 955 pps->ppstc = tc; 956 *pcount = count; 957 return; 958 } 959 960 /* Nothing really happened */ 961 if (*pcount == count) 962 return; 963 964 *pcount = count; 965 966 /* Convert the count to timespec */ 967 ts.tv_sec = tc->tc_offset_sec; 968 tcount = count - tc->tc_offset_count; 969 tcount &= tc->tc_counter_mask; 970 delta = tc->tc_offset_nano; 971 delta += ((u_int64_t)tcount * tc->tc_scale_nano_f); 972 delta >>= 32; 973 delta += ((u_int64_t)tcount * tc->tc_scale_nano_i); 974 delta += boottime.tv_usec * 1000; 975 ts.tv_sec += boottime.tv_sec; 976 while (delta >= 1000000000) { 977 delta -= 1000000000; 978 ts.tv_sec++; 979 } 980 ts.tv_nsec = delta; 981 982 (*pseq)++; 983 *tsp = ts; 984 985 if (foff) { 986 timespecadd(tsp, osp); 987 if (tsp->tv_nsec < 0) { 988 tsp->tv_nsec += 1000000000; 989 tsp->tv_sec -= 1; 990 } 991 } 992#ifdef PPS_SYNC 993 if (fhard) { 994 /* magic, at its best... */ 995 tcount = count - pps->ppscount[2]; 996 pps->ppscount[2] = count; 997 tcount &= tc->tc_counter_mask; 998 delta = ((u_int64_t)tcount * tc->tc_tweak->tc_scale_nano_f); 999 delta >>= 32; 1000 delta += ((u_int64_t)tcount * tc->tc_tweak->tc_scale_nano_i); 1001 hardpps(tsp, delta); 1002 } 1003#endif 1004} | |