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Add time support files from FreeBSD to build to resolve more symbols

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This commit is contained in:
Joel Sherrill 2012-03-09 09:19:06 -06:00
parent 89217b5728
commit 562783d3c5
5 changed files with 1485 additions and 0 deletions
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freebsd/kern/kern_tc.c Normal file
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#include <freebsd/machine/rtems-bsd-config.h>
/*-
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*/
#include <freebsd/sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <freebsd/local/opt_ntp.h>
#include <freebsd/sys/param.h>
#include <freebsd/sys/kernel.h>
#include <freebsd/sys/sysctl.h>
#include <freebsd/sys/syslog.h>
#include <freebsd/sys/systm.h>
#include <freebsd/sys/timepps.h>
#include <freebsd/sys/timetc.h>
#include <freebsd/sys/timex.h>
/*
* A large step happens on boot. This constant detects such steps.
* It is relatively small so that ntp_update_second gets called enough
* in the typical 'missed a couple of seconds' case, but doesn't loop
* forever when the time step is large.
*/
#define LARGE_STEP 200
/*
* Implement a dummy timecounter which we can use until we get a real one
* in the air. This allows the console and other early stuff to use
* time services.
*/
static u_int
dummy_get_timecount(struct timecounter *tc)
{
static u_int now;
return (++now);
}
static struct timecounter dummy_timecounter = {
dummy_get_timecount, 0, ~0u, 1000000, "dummy", -1000000
};
struct timehands {
/* These fields must be initialized by the driver. */
struct timecounter *th_counter;
int64_t th_adjustment;
u_int64_t th_scale;
u_int th_offset_count;
struct bintime th_offset;
struct timeval th_microtime;
struct timespec th_nanotime;
/* Fields not to be copied in tc_windup start with th_generation. */
volatile u_int th_generation;
struct timehands *th_next;
};
static struct timehands th0;
static struct timehands th9 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th0};
static struct timehands th8 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th9};
static struct timehands th7 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th8};
static struct timehands th6 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th7};
static struct timehands th5 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th6};
static struct timehands th4 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th5};
static struct timehands th3 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th4};
static struct timehands th2 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th3};
static struct timehands th1 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 0, &th2};
static struct timehands th0 = {
&dummy_timecounter,
0,
(uint64_t)-1 / 1000000,
0,
{1, 0},
{0, 0},
{0, 0},
1,
&th1
};
static struct timehands *volatile timehands = &th0;
struct timecounter *timecounter = &dummy_timecounter;
static struct timecounter *timecounters = &dummy_timecounter;
time_t time_second = 1;
time_t time_uptime = 1;
static struct bintime boottimebin;
struct timeval boottime;
static int sysctl_kern_boottime(SYSCTL_HANDLER_ARGS);
SYSCTL_PROC(_kern, KERN_BOOTTIME, boottime, CTLTYPE_STRUCT|CTLFLAG_RD,
NULL, 0, sysctl_kern_boottime, "S,timeval", "System boottime");
SYSCTL_NODE(_kern, OID_AUTO, timecounter, CTLFLAG_RW, 0, "");
SYSCTL_NODE(_kern_timecounter, OID_AUTO, tc, CTLFLAG_RW, 0, "");
static int timestepwarnings;
SYSCTL_INT(_kern_timecounter, OID_AUTO, stepwarnings, CTLFLAG_RW,
&timestepwarnings, 0, "Log time steps");
static void tc_windup(void);
static void cpu_tick_calibrate(int);
static int
sysctl_kern_boottime(SYSCTL_HANDLER_ARGS)
{
#ifdef SCTL_MASK32
int tv[2];
if (req->flags & SCTL_MASK32) {
tv[0] = boottime.tv_sec;
tv[1] = boottime.tv_usec;
return SYSCTL_OUT(req, tv, sizeof(tv));
} else
#endif
return SYSCTL_OUT(req, &boottime, sizeof(boottime));
}
static int
sysctl_kern_timecounter_get(SYSCTL_HANDLER_ARGS)
{
u_int ncount;
struct timecounter *tc = arg1;
ncount = tc->tc_get_timecount(tc);
return sysctl_handle_int(oidp, &ncount, 0, req);
}
static int
sysctl_kern_timecounter_freq(SYSCTL_HANDLER_ARGS)
{
u_int64_t freq;
struct timecounter *tc = arg1;
freq = tc->tc_frequency;
return sysctl_handle_quad(oidp, &freq, 0, req);
}
/*
* Return the difference between the timehands' counter value now and what
* was when we copied it to the timehands' offset_count.
*/
static __inline u_int
tc_delta(struct timehands *th)
{
struct timecounter *tc;
tc = th->th_counter;
return ((tc->tc_get_timecount(tc) - th->th_offset_count) &
tc->tc_counter_mask);
}
/*
* Functions for reading the time. We have to loop until we are sure that
* the timehands that we operated on was not updated under our feet. See
* the comment in <sys/time.h> for a description of these 12 functions.
*/
void
binuptime(struct bintime *bt)
{
struct timehands *th;
u_int gen;
do {
th = timehands;
gen = th->th_generation;
*bt = th->th_offset;
bintime_addx(bt, th->th_scale * tc_delta(th));
} while (gen == 0 || gen != th->th_generation);
}
void
nanouptime(struct timespec *tsp)
{
struct bintime bt;
binuptime(&bt);
bintime2timespec(&bt, tsp);
}
void
microuptime(struct timeval *tvp)
{
struct bintime bt;
binuptime(&bt);
bintime2timeval(&bt, tvp);
}
void
bintime(struct bintime *bt)
{
binuptime(bt);
bintime_add(bt, &boottimebin);
}
void
nanotime(struct timespec *tsp)
{
struct bintime bt;
bintime(&bt);
bintime2timespec(&bt, tsp);
}
void
microtime(struct timeval *tvp)
{
struct bintime bt;
bintime(&bt);
bintime2timeval(&bt, tvp);
}
void
getbinuptime(struct bintime *bt)
{
struct timehands *th;
u_int gen;
do {
th = timehands;
gen = th->th_generation;
*bt = th->th_offset;
} while (gen == 0 || gen != th->th_generation);
}
void
getnanouptime(struct timespec *tsp)
{
struct timehands *th;
u_int gen;
do {
th = timehands;
gen = th->th_generation;
bintime2timespec(&th->th_offset, tsp);
} while (gen == 0 || gen != th->th_generation);
}
void
getmicrouptime(struct timeval *tvp)
{
struct timehands *th;
u_int gen;
do {
th = timehands;
gen = th->th_generation;
bintime2timeval(&th->th_offset, tvp);
} while (gen == 0 || gen != th->th_generation);
}
void
getbintime(struct bintime *bt)
{
struct timehands *th;
u_int gen;
do {
th = timehands;
gen = th->th_generation;
*bt = th->th_offset;
} while (gen == 0 || gen != th->th_generation);
bintime_add(bt, &boottimebin);
}
void
getnanotime(struct timespec *tsp)
{
struct timehands *th;
u_int gen;
do {
th = timehands;
gen = th->th_generation;
*tsp = th->th_nanotime;
} while (gen == 0 || gen != th->th_generation);
}
void
getmicrotime(struct timeval *tvp)
{
struct timehands *th;
u_int gen;
do {
th = timehands;
gen = th->th_generation;
*tvp = th->th_microtime;
} while (gen == 0 || gen != th->th_generation);
}
/*
* Initialize a new timecounter and possibly use it.
*/
void
tc_init(struct timecounter *tc)
{
u_int u;
struct sysctl_oid *tc_root;
u = tc->tc_frequency / tc->tc_counter_mask;
/* XXX: We need some margin here, 10% is a guess */
u *= 11;
u /= 10;
if (u > hz && tc->tc_quality >= 0) {
tc->tc_quality = -2000;
if (bootverbose) {
printf("Timecounter \"%s\" frequency %ju Hz",
tc->tc_name, (uintmax_t)tc->tc_frequency);
printf(" -- Insufficient hz, needs at least %u\n", u);
}
} else if (tc->tc_quality >= 0 || bootverbose) {
printf("Timecounter \"%s\" frequency %ju Hz quality %d\n",
tc->tc_name, (uintmax_t)tc->tc_frequency,
tc->tc_quality);
}
tc->tc_next = timecounters;
timecounters = tc;
/*
* Set up sysctl tree for this counter.
*/
tc_root = SYSCTL_ADD_NODE(NULL,
SYSCTL_STATIC_CHILDREN(_kern_timecounter_tc), OID_AUTO, tc->tc_name,
CTLFLAG_RW, 0, "timecounter description");
SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO,
"mask", CTLFLAG_RD, &(tc->tc_counter_mask), 0,
"mask for implemented bits");
SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO,
"counter", CTLTYPE_UINT | CTLFLAG_RD, tc, sizeof(*tc),
sysctl_kern_timecounter_get, "IU", "current timecounter value");
SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO,
"frequency", CTLTYPE_QUAD | CTLFLAG_RD, tc, sizeof(*tc),
sysctl_kern_timecounter_freq, "QU", "timecounter frequency");
SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(tc_root), OID_AUTO,
"quality", CTLFLAG_RD, &(tc->tc_quality), 0,
"goodness of time counter");
/*
* Never automatically use a timecounter with negative quality.
* Even though we run on the dummy counter, switching here may be
* worse since this timecounter may not be monotonous.
*/
if (tc->tc_quality < 0)
return;
if (tc->tc_quality < timecounter->tc_quality)
return;
if (tc->tc_quality == timecounter->tc_quality &&
tc->tc_frequency < timecounter->tc_frequency)
return;
(void)tc->tc_get_timecount(tc);
(void)tc->tc_get_timecount(tc);
timecounter = tc;
}
/* Report the frequency of the current timecounter. */
u_int64_t
tc_getfrequency(void)
{
return (timehands->th_counter->tc_frequency);
}
/*
* Step our concept of UTC. This is done by modifying our estimate of
* when we booted.
* XXX: not locked.
*/
void
tc_setclock(struct timespec *ts)
{
struct timespec tbef, taft;
struct bintime bt, bt2;
cpu_tick_calibrate(1);
nanotime(&tbef);
timespec2bintime(ts, &bt);
binuptime(&bt2);
bintime_sub(&bt, &bt2);
bintime_add(&bt2, &boottimebin);
boottimebin = bt;
bintime2timeval(&bt, &boottime);
/* XXX fiddle all the little crinkly bits around the fiords... */
tc_windup();
nanotime(&taft);
if (timestepwarnings) {
log(LOG_INFO,
"Time stepped from %jd.%09ld to %jd.%09ld (%jd.%09ld)\n",
(intmax_t)tbef.tv_sec, tbef.tv_nsec,
(intmax_t)taft.tv_sec, taft.tv_nsec,
(intmax_t)ts->tv_sec, ts->tv_nsec);
}
cpu_tick_calibrate(1);
}
/*
* Initialize the next struct timehands in the ring and make
* it the active timehands. Along the way we might switch to a different
* timecounter and/or do seconds processing in NTP. Slightly magic.
*/
static void
tc_windup(void)
{
struct bintime bt;
struct timehands *th, *tho;
u_int64_t scale;
u_int delta, ncount, ogen;
int i;
time_t t;
/*
* Make the next timehands a copy of the current one, but do not
* overwrite the generation or next pointer. While we update
* the contents, the generation must be zero.
*/
tho = timehands;
th = tho->th_next;
ogen = th->th_generation;
th->th_generation = 0;
bcopy(tho, th, offsetof(struct timehands, th_generation));
/*
* Capture a timecounter delta on the current timecounter and if
* changing timecounters, a counter value from the new timecounter.
* Update the offset fields accordingly.
*/
delta = tc_delta(th);
if (th->th_counter != timecounter)
ncount = timecounter->tc_get_timecount(timecounter);
else
ncount = 0;
th->th_offset_count += delta;
th->th_offset_count &= th->th_counter->tc_counter_mask;
while (delta > th->th_counter->tc_frequency) {
/* Eat complete unadjusted seconds. */
delta -= th->th_counter->tc_frequency;
th->th_offset.sec++;
}
if ((delta > th->th_counter->tc_frequency / 2) &&
(th->th_scale * delta < ((uint64_t)1 << 63))) {
/* The product th_scale * delta just barely overflows. */
th->th_offset.sec++;
}
bintime_addx(&th->th_offset, th->th_scale * delta);
/*
* Hardware latching timecounters may not generate interrupts on
* PPS events, so instead we poll them. There is a finite risk that
* the hardware might capture a count which is later than the one we
* got above, and therefore possibly in the next NTP second which might
* have a different rate than the current NTP second. It doesn't
* matter in practice.
*/
if (tho->th_counter->tc_poll_pps)
tho->th_counter->tc_poll_pps(tho->th_counter);
/*
* Deal with NTP second processing. The for loop normally
* iterates at most once, but in extreme situations it might
* keep NTP sane if timeouts are not run for several seconds.
* At boot, the time step can be large when the TOD hardware
* has been read, so on really large steps, we call
* ntp_update_second only twice. We need to call it twice in
* case we missed a leap second.
*/
bt = th->th_offset;
bintime_add(&bt, &boottimebin);
i = bt.sec - tho->th_microtime.tv_sec;
if (i > LARGE_STEP)
i = 2;
for (; i > 0; i--) {
t = bt.sec;
ntp_update_second(&th->th_adjustment, &bt.sec);
if (bt.sec != t)
boottimebin.sec += bt.sec - t;
}
/* Update the UTC timestamps used by the get*() functions. */
/* XXX shouldn't do this here. Should force non-`get' versions. */
bintime2timeval(&bt, &th->th_microtime);
bintime2timespec(&bt, &th->th_nanotime);
/* Now is a good time to change timecounters. */
if (th->th_counter != timecounter) {
th->th_counter = timecounter;
th->th_offset_count = ncount;
}
/*-
* Recalculate the scaling factor. We want the number of 1/2^64
* fractions of a second per period of the hardware counter, taking
* into account the th_adjustment factor which the NTP PLL/adjtime(2)
* processing provides us with.
*
* The th_adjustment is nanoseconds per second with 32 bit binary
* fraction and we want 64 bit binary fraction of second:
*
* x = a * 2^32 / 10^9 = a * 4.294967296
*
* The range of th_adjustment is +/- 5000PPM so inside a 64bit int
* we can only multiply by about 850 without overflowing, that
* leaves no suitably precise fractions for multiply before divide.
*
* Divide before multiply with a fraction of 2199/512 results in a
* systematic undercompensation of 10PPM of th_adjustment. On a
* 5000PPM adjustment this is a 0.05PPM error. This is acceptable.
*
* We happily sacrifice the lowest of the 64 bits of our result
* to the goddess of code clarity.
*
*/
scale = (u_int64_t)1 << 63;
scale += (th->th_adjustment / 1024) * 2199;
scale /= th->th_counter->tc_frequency;
th->th_scale = scale * 2;
/*
* Now that the struct timehands is again consistent, set the new
* generation number, making sure to not make it zero.
*/
if (++ogen == 0)
ogen = 1;
th->th_generation = ogen;
/* Go live with the new struct timehands. */
time_second = th->th_microtime.tv_sec;
time_uptime = th->th_offset.sec;
timehands = th;
}
/* Report or change the active timecounter hardware. */
static int
sysctl_kern_timecounter_hardware(SYSCTL_HANDLER_ARGS)
{
char newname[32];
struct timecounter *newtc, *tc;
int error;
tc = timecounter;
strlcpy(newname, tc->tc_name, sizeof(newname));
error = sysctl_handle_string(oidp, &newname[0], sizeof(newname), req);
if (error != 0 || req->newptr == NULL ||
strcmp(newname, tc->tc_name) == 0)
return (error);
for (newtc = timecounters; newtc != NULL; newtc = newtc->tc_next) {
if (strcmp(newname, newtc->tc_name) != 0)
continue;
/* Warm up new timecounter. */
(void)newtc->tc_get_timecount(newtc);
(void)newtc->tc_get_timecount(newtc);
timecounter = newtc;
return (0);
}
return (EINVAL);
}
SYSCTL_PROC(_kern_timecounter, OID_AUTO, hardware, CTLTYPE_STRING | CTLFLAG_RW,
0, 0, sysctl_kern_timecounter_hardware, "A",
"Timecounter hardware selected");
/* Report or change the active timecounter hardware. */
static int
sysctl_kern_timecounter_choice(SYSCTL_HANDLER_ARGS)
{
char buf[32], *spc;
struct timecounter *tc;
int error;
spc = "";
error = 0;
for (tc = timecounters; error == 0 && tc != NULL; tc = tc->tc_next) {
sprintf(buf, "%s%s(%d)",
spc, tc->tc_name, tc->tc_quality);
error = SYSCTL_OUT(req, buf, strlen(buf));
spc = " ";
}
return (error);
}
SYSCTL_PROC(_kern_timecounter, OID_AUTO, choice, CTLTYPE_STRING | CTLFLAG_RD,
0, 0, sysctl_kern_timecounter_choice, "A", "Timecounter hardware detected");
/*
* RFC 2783 PPS-API implementation.
*/
int
pps_ioctl(u_long cmd, caddr_t data, struct pps_state *pps)
{
pps_params_t *app;
struct pps_fetch_args *fapi;
#ifdef PPS_SYNC
struct pps_kcbind_args *kapi;
#endif
KASSERT(pps != NULL, ("NULL pps pointer in pps_ioctl"));
switch (cmd) {
case PPS_IOC_CREATE:
return (0);
case PPS_IOC_DESTROY:
return (0);
case PPS_IOC_SETPARAMS:
app = (pps_params_t *)data;
if (app->mode & ~pps->ppscap)
return (EINVAL);
pps->ppsparam = *app;
return (0);
case PPS_IOC_GETPARAMS:
app = (pps_params_t *)data;
*app = pps->ppsparam;
app->api_version = PPS_API_VERS_1;
return (0);
case PPS_IOC_GETCAP:
*(int*)data = pps->ppscap;
return (0);
case PPS_IOC_FETCH:
fapi = (struct pps_fetch_args *)data;
if (fapi->tsformat && fapi->tsformat != PPS_TSFMT_TSPEC)
return (EINVAL);
if (fapi->timeout.tv_sec || fapi->timeout.tv_nsec)
return (EOPNOTSUPP);
pps->ppsinfo.current_mode = pps->ppsparam.mode;
fapi->pps_info_buf = pps->ppsinfo;
return (0);
case PPS_IOC_KCBIND:
#ifdef PPS_SYNC
kapi = (struct pps_kcbind_args *)data;
/* XXX Only root should be able to do this */
if (kapi->tsformat && kapi->tsformat != PPS_TSFMT_TSPEC)
return (EINVAL);
if (kapi->kernel_consumer != PPS_KC_HARDPPS)
return (EINVAL);
if (kapi->edge & ~pps->ppscap)
return (EINVAL);
pps->kcmode = kapi->edge;
return (0);
#else
return (EOPNOTSUPP);
#endif
default:
return (ENOIOCTL);
}
}
void
pps_init(struct pps_state *pps)
{
pps->ppscap |= PPS_TSFMT_TSPEC;
if (pps->ppscap & PPS_CAPTUREASSERT)
pps->ppscap |= PPS_OFFSETASSERT;
if (pps->ppscap & PPS_CAPTURECLEAR)
pps->ppscap |= PPS_OFFSETCLEAR;
}
void
pps_capture(struct pps_state *pps)
{
struct timehands *th;
KASSERT(pps != NULL, ("NULL pps pointer in pps_capture"));
th = timehands;
pps->capgen = th->th_generation;
pps->capth = th;
pps->capcount = th->th_counter->tc_get_timecount(th->th_counter);
if (pps->capgen != th->th_generation)
pps->capgen = 0;
}
void
pps_event(struct pps_state *pps, int event)
{
struct bintime bt;
struct timespec ts, *tsp, *osp;
u_int tcount, *pcount;
int foff, fhard;
pps_seq_t *pseq;
KASSERT(pps != NULL, ("NULL pps pointer in pps_event"));
/* If the timecounter was wound up underneath us, bail out. */
if (pps->capgen == 0 || pps->capgen != pps->capth->th_generation)
return;
/* Things would be easier with arrays. */
if (event == PPS_CAPTUREASSERT) {
tsp = &pps->ppsinfo.assert_timestamp;
osp = &pps->ppsparam.assert_offset;
foff = pps->ppsparam.mode & PPS_OFFSETASSERT;
fhard = pps->kcmode & PPS_CAPTUREASSERT;
pcount = &pps->ppscount[0];
pseq = &pps->ppsinfo.assert_sequence;
} else {
tsp = &pps->ppsinfo.clear_timestamp;
osp = &pps->ppsparam.clear_offset;
foff = pps->ppsparam.mode & PPS_OFFSETCLEAR;
fhard = pps->kcmode & PPS_CAPTURECLEAR;
pcount = &pps->ppscount[1];
pseq = &pps->ppsinfo.clear_sequence;
}
/*
* If the timecounter changed, we cannot compare the count values, so
* we have to drop the rest of the PPS-stuff until the next event.
*/
if (pps->ppstc != pps->capth->th_counter) {
pps->ppstc = pps->capth->th_counter;
*pcount = pps->capcount;
pps->ppscount[2] = pps->capcount;
return;
}
/* Convert the count to a timespec. */
tcount = pps->capcount - pps->capth->th_offset_count;
tcount &= pps->capth->th_counter->tc_counter_mask;
bt = pps->capth->th_offset;
bintime_addx(&bt, pps->capth->th_scale * tcount);
bintime_add(&bt, &boottimebin);
bintime2timespec(&bt, &ts);
/* If the timecounter was wound up underneath us, bail out. */
if (pps->capgen != pps->capth->th_generation)
return;
*pcount = pps->capcount;
(*pseq)++;
*tsp = ts;
if (foff) {
timespecadd(tsp, osp);
if (tsp->tv_nsec < 0) {
tsp->tv_nsec += 1000000000;
tsp->tv_sec -= 1;
}
}
#ifdef PPS_SYNC
if (fhard) {
u_int64_t scale;
/*
* Feed the NTP PLL/FLL.
* The FLL wants to know how many (hardware) nanoseconds
* elapsed since the previous event.
*/
tcount = pps->capcount - pps->ppscount[2];
pps->ppscount[2] = pps->capcount;
tcount &= pps->capth->th_counter->tc_counter_mask;
scale = (u_int64_t)1 << 63;
scale /= pps->capth->th_counter->tc_frequency;
scale *= 2;
bt.sec = 0;
bt.frac = 0;
bintime_addx(&bt, scale * tcount);
bintime2timespec(&bt, &ts);
hardpps(tsp, ts.tv_nsec + 1000000000 * ts.tv_sec);
}
#endif
}
/*
* Timecounters need to be updated every so often to prevent the hardware
* counter from overflowing. Updating also recalculates the cached values
* used by the get*() family of functions, so their precision depends on
* the update frequency.
*/
static int tc_tick;
SYSCTL_INT(_kern_timecounter, OID_AUTO, tick, CTLFLAG_RD, &tc_tick, 0,
"Approximate number of hardclock ticks in a millisecond");
void
tc_ticktock(void)
{
static int count;
static time_t last_calib;
if (++count < tc_tick)
return;
count = 0;
tc_windup();
if (time_uptime != last_calib && !(time_uptime & 0xf)) {
cpu_tick_calibrate(0);
last_calib = time_uptime;
}
}
static void
inittimecounter(void *dummy)
{
u_int p;
/*
* Set the initial timeout to
* max(1, <approx. number of hardclock ticks in a millisecond>).
* People should probably not use the sysctl to set the timeout
* to smaller than its inital value, since that value is the
* smallest reasonable one. If they want better timestamps they
* should use the non-"get"* functions.
*/
if (hz > 1000)
tc_tick = (hz + 500) / 1000;
else
tc_tick = 1;
p = (tc_tick * 1000000) / hz;
printf("Timecounters tick every %d.%03u msec\n", p / 1000, p % 1000);
/* warm up new timecounter (again) and get rolling. */
(void)timecounter->tc_get_timecount(timecounter);
(void)timecounter->tc_get_timecount(timecounter);
}
SYSINIT(timecounter, SI_SUB_CLOCKS, SI_ORDER_SECOND, inittimecounter, NULL);
/* Cpu tick handling -------------------------------------------------*/
static int cpu_tick_variable;
static uint64_t cpu_tick_frequency;
static uint64_t
tc_cpu_ticks(void)
{
static uint64_t base;
static unsigned last;
unsigned u;
struct timecounter *tc;
tc = timehands->th_counter;
u = tc->tc_get_timecount(tc) & tc->tc_counter_mask;
if (u < last)
base += (uint64_t)tc->tc_counter_mask + 1;
last = u;
return (u + base);
}
/*
* This function gets called every 16 seconds on only one designated
* CPU in the system from hardclock() via tc_ticktock().
*
* Whenever the real time clock is stepped we get called with reset=1
* to make sure we handle suspend/resume and similar events correctly.
*/
static void
cpu_tick_calibrate(int reset)
{
static uint64_t c_last;
uint64_t c_this, c_delta;
static struct bintime t_last;
struct bintime t_this, t_delta;
uint32_t divi;
if (reset) {
/* The clock was stepped, abort & reset */
t_last.sec = 0;
return;
}
/* we don't calibrate fixed rate cputicks */
if (!cpu_tick_variable)
return;
getbinuptime(&t_this);
c_this = cpu_ticks();
if (t_last.sec != 0) {
c_delta = c_this - c_last;
t_delta = t_this;
bintime_sub(&t_delta, &t_last);
/*
* Validate that 16 +/- 1/256 seconds passed.
* After division by 16 this gives us a precision of
* roughly 250PPM which is sufficient
*/
if (t_delta.sec > 16 || (
t_delta.sec == 16 && t_delta.frac >= (0x01LL << 56))) {
/* too long */
if (bootverbose)
printf("t_delta %ju.%016jx too long\n",
(uintmax_t)t_delta.sec,
(uintmax_t)t_delta.frac);
} else if (t_delta.sec < 15 ||
(t_delta.sec == 15 && t_delta.frac <= (0xffLL << 56))) {
/* too short */
if (bootverbose)
printf("t_delta %ju.%016jx too short\n",
(uintmax_t)t_delta.sec,
(uintmax_t)t_delta.frac);
} else {
/* just right */
/*
* Headroom:
* 2^(64-20) / 16[s] =
* 2^(44) / 16[s] =
* 17.592.186.044.416 / 16 =
* 1.099.511.627.776 [Hz]
*/
divi = t_delta.sec << 20;
divi |= t_delta.frac >> (64 - 20);
c_delta <<= 20;
c_delta /= divi;
if (c_delta > cpu_tick_frequency) {
if (0 && bootverbose)
printf("cpu_tick increased to %ju Hz\n",
c_delta);
cpu_tick_frequency = c_delta;
}
}
}
c_last = c_this;
t_last = t_this;
}
void
set_cputicker(cpu_tick_f *func, uint64_t freq, unsigned var)
{
if (func == NULL) {
cpu_ticks = tc_cpu_ticks;
} else {
cpu_tick_frequency = freq;
cpu_tick_variable = var;
cpu_ticks = func;
}
}
uint64_t
cpu_tickrate(void)
{
if (cpu_ticks == tc_cpu_ticks)
return (tc_getfrequency());
return (cpu_tick_frequency);
}
/*
* We need to be slightly careful converting cputicks to microseconds.
* There is plenty of margin in 64 bits of microseconds (half a million
* years) and in 64 bits at 4 GHz (146 years), but if we do a multiply
* before divide conversion (to retain precision) we find that the
* margin shrinks to 1.5 hours (one millionth of 146y).
* With a three prong approach we never lose significant bits, no
* matter what the cputick rate and length of timeinterval is.
*/
uint64_t
cputick2usec(uint64_t tick)
{
if (tick > 18446744073709551LL) /* floor(2^64 / 1000) */
return (tick / (cpu_tickrate() / 1000000LL));
else if (tick > 18446744073709LL) /* floor(2^64 / 1000000) */
return ((tick * 1000LL) / (cpu_tickrate() / 1000LL));
else
return ((tick * 1000000LL) / cpu_tickrate());
}
cpu_tick_f *cpu_ticks = tc_cpu_ticks;

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/* EMPTY */

200
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/*-
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $FreeBSD$
*
* The is a FreeBSD version of the RFC 2783 API for Pulse Per Second
* timing interfaces.
*/
#ifndef _SYS_TIMEPPS_HH_
#define _SYS_TIMEPPS_HH_
#include <freebsd/sys/ioccom.h>
#include <freebsd/sys/time.h>
#define PPS_API_VERS_1 1
typedef int pps_handle_t;
typedef unsigned pps_seq_t;
typedef struct ntp_fp {
unsigned int integral;
unsigned int fractional;
} ntp_fp_t;
typedef union pps_timeu {
struct timespec tspec;
ntp_fp_t ntpfp;
unsigned long longpad[3];
} pps_timeu_t;
typedef struct {
pps_seq_t assert_sequence; /* assert event seq # */
pps_seq_t clear_sequence; /* clear event seq # */
pps_timeu_t assert_tu;
pps_timeu_t clear_tu;
int current_mode; /* current mode bits */
} pps_info_t;
#define assert_timestamp assert_tu.tspec
#define clear_timestamp clear_tu.tspec
#define assert_timestamp_ntpfp assert_tu.ntpfp
#define clear_timestamp_ntpfp clear_tu.ntpfp
typedef struct {
int api_version; /* API version # */
int mode; /* mode bits */
pps_timeu_t assert_off_tu;
pps_timeu_t clear_off_tu;
} pps_params_t;
#define assert_offset assert_off_tu.tspec
#define clear_offset clear_off_tu.tspec
#define assert_offset_ntpfp assert_off_tu.ntpfp
#define clear_offset_ntpfp clear_off_tu.ntpfp
#define PPS_CAPTUREASSERT 0x01
#define PPS_CAPTURECLEAR 0x02
#define PPS_CAPTUREBOTH 0x03
#define PPS_OFFSETASSERT 0x10
#define PPS_OFFSETCLEAR 0x20
#define PPS_ECHOASSERT 0x40
#define PPS_ECHOCLEAR 0x80
#define PPS_CANWAIT 0x100
#define PPS_CANPOLL 0x200
#define PPS_TSFMT_TSPEC 0x1000
#define PPS_TSFMT_NTPFP 0x2000
#define PPS_KC_HARDPPS 0
#define PPS_KC_HARDPPS_PLL 1
#define PPS_KC_HARDPPS_FLL 2
struct pps_fetch_args {
int tsformat;
pps_info_t pps_info_buf;
struct timespec timeout;
};
struct pps_kcbind_args {
int kernel_consumer;
int edge;
int tsformat;
};
#define PPS_IOC_CREATE _IO('1', 1)
#define PPS_IOC_DESTROY _IO('1', 2)
#define PPS_IOC_SETPARAMS _IOW('1', 3, pps_params_t)
#define PPS_IOC_GETPARAMS _IOR('1', 4, pps_params_t)
#define PPS_IOC_GETCAP _IOR('1', 5, int)
#define PPS_IOC_FETCH _IOWR('1', 6, struct pps_fetch_args)
#define PPS_IOC_KCBIND _IOW('1', 7, struct pps_kcbind_args)
#ifdef _KERNEL
struct pps_state {
/* Capture information. */
struct timehands *capth;
unsigned capgen;
unsigned capcount;
/* State information. */
pps_params_t ppsparam;
pps_info_t ppsinfo;
int kcmode;
int ppscap;
struct timecounter *ppstc;
unsigned ppscount[3];
};
void pps_capture(struct pps_state *pps);
void pps_event(struct pps_state *pps, int event);
void pps_init(struct pps_state *pps);
int pps_ioctl(unsigned long cmd, caddr_t data, struct pps_state *pps);
void hardpps(struct timespec *tsp, long nsec);
#else /* !_KERNEL */
static __inline int
time_pps_create(int filedes, pps_handle_t *handle)
{
int error;
*handle = -1;
error = ioctl(filedes, PPS_IOC_CREATE, 0);
if (error < 0)
return (-1);
*handle = filedes;
return (0);
}
static __inline int
time_pps_destroy(pps_handle_t handle)
{
return (ioctl(handle, PPS_IOC_DESTROY, 0));
}
static __inline int
time_pps_setparams(pps_handle_t handle, const pps_params_t *ppsparams)
{
return (ioctl(handle, PPS_IOC_SETPARAMS, ppsparams));
}
static __inline int
time_pps_getparams(pps_handle_t handle, pps_params_t *ppsparams)
{
return (ioctl(handle, PPS_IOC_GETPARAMS, ppsparams));
}
static __inline int
time_pps_getcap(pps_handle_t handle, int *mode)
{
return (ioctl(handle, PPS_IOC_GETCAP, mode));
}
static __inline int
time_pps_fetch(pps_handle_t handle, const int tsformat,
pps_info_t *ppsinfobuf, const struct timespec *timeout)
{
int error;
struct pps_fetch_args arg;
arg.tsformat = tsformat;
if (timeout == NULL) {
arg.timeout.tv_sec = -1;
arg.timeout.tv_nsec = -1;
} else
arg.timeout = *timeout;
error = ioctl(handle, PPS_IOC_FETCH, &arg);
*ppsinfobuf = arg.pps_info_buf;
return (error);
}
static __inline int
time_pps_kcbind(pps_handle_t handle, const int kernel_consumer,
const int edge, const int tsformat)
{
struct pps_kcbind_args arg;
arg.kernel_consumer = kernel_consumer;
arg.edge = edge;
arg.tsformat = tsformat;
return (ioctl(handle, PPS_IOC_KCBIND, &arg));
}
#endif /* KERNEL */
#endif /* !_SYS_TIMEPPS_HH_ */

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/*-
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $FreeBSD$
*/
#ifndef _SYS_TIMETC_HH_
#define _SYS_TIMETC_HH_
#ifndef _KERNEL
#error "no user-serviceable parts inside"
#endif
/*-
* `struct timecounter' is the interface between the hardware which implements
* a timecounter and the MI code which uses this to keep track of time.
*
* A timecounter is a binary counter which has two properties:
* * it runs at a fixed, known frequency.
* * it has sufficient bits to not roll over in less than approximately
* max(2 msec, 2/HZ seconds). (The value 2 here is really 1 + delta,
* for some indeterminate value of delta.)
*/
struct timecounter;
typedef u_int timecounter_get_t(struct timecounter *);
typedef void timecounter_pps_t(struct timecounter *);
struct timecounter {
timecounter_get_t *tc_get_timecount;
/*
* This function reads the counter. It is not required to
* mask any unimplemented bits out, as long as they are
* constant.
*/
timecounter_pps_t *tc_poll_pps;
/*
* This function is optional. It will be called whenever the
* timecounter is rewound, and is intended to check for PPS
* events. Normal hardware does not need it but timecounters
* which latch PPS in hardware (like sys/pci/xrpu.c) do.
*/
u_int tc_counter_mask;
/* This mask should mask off any unimplemented bits. */
u_int64_t tc_frequency;
/* Frequency of the counter in Hz. */
char *tc_name;
/* Name of the timecounter. */
int tc_quality;
/*
* Used to determine if this timecounter is better than
* another timecounter higher means better. Negative
* means "only use at explicit request".
*/
void *tc_priv;
/* Pointer to the timecounter's private parts. */
struct timecounter *tc_next;
/* Pointer to the next timecounter. */
};
extern struct timecounter *timecounter;
u_int64_t tc_getfrequency(void);
void tc_init(struct timecounter *tc);
void tc_setclock(struct timespec *ts);
void tc_ticktock(void);
#ifdef SYSCTL_DECL
SYSCTL_DECL(_kern_timecounter);
#endif
#endif /* !_SYS_TIMETC_HH_ */

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/*-
***********************************************************************
* *
* Copyright (c) David L. Mills 1993-2001 *
* *
* Permission to use, copy, modify, and distribute this software and *
* its documentation for any purpose and without fee is hereby *
* granted, provided that the above copyright notice appears in all *
* copies and that both the copyright notice and this permission *
* notice appear in supporting documentation, and that the name *
* University of Delaware not be used in advertising or publicity *
* pertaining to distribution of the software without specific, *
* written prior permission. The University of Delaware makes no *
* representations about the suitability this software for any *
* purpose. It is provided "as is" without express or implied *
* warranty. *
* *
**********************************************************************/
/*
* Modification history timex.h
*
* 16 Aug 00 David L. Mills
* API Version 4. Added MOD_TAI and tai member of ntptimeval
* structure.
*
* 17 Nov 98 David L. Mills
* Revised for nanosecond kernel and user interface.
*
* 26 Sep 94 David L. Mills
* Added defines for hybrid phase/frequency-lock loop.
*
* 19 Mar 94 David L. Mills
* Moved defines from kernel routines to header file and added new
* defines for PPS phase-lock loop.
*
* 20 Feb 94 David L. Mills
* Revised status codes and structures for external clock and PPS
* signal discipline.
*
* 28 Nov 93 David L. Mills
* Adjusted parameters to improve stability and increase poll
* interval.
*
* 17 Sep 93 David L. Mills
* Created file
*
* $FreeBSD$
*/
/*
* This header file defines the Network Time Protocol (NTP) interfaces
* for user and daemon application programs. These are implemented using
* defined syscalls and data structures and require specific kernel
* support.
*
* The original precision time kernels developed from 1993 have an
* ultimate resolution of one microsecond; however, the most recent
* kernels have an ultimate resolution of one nanosecond. In these
* kernels, a ntp_adjtime() syscalls can be used to determine which
* resolution is in use and to select either one at any time. The
* resolution selected affects the scaling of certain fields in the
* ntp_gettime() and ntp_adjtime() syscalls, as described below.
*
* NAME
* ntp_gettime - NTP user application interface
*
* SYNOPSIS
* #include <freebsd/sys/timex.h>
*
* int ntp_gettime(struct ntptimeval *ntv);
*
* DESCRIPTION
* The time returned by ntp_gettime() is in a timespec structure,
* but may be in either microsecond (seconds and microseconds) or
* nanosecond (seconds and nanoseconds) format. The particular
* format in use is determined by the STA_NANO bit of the status
* word returned by the ntp_adjtime() syscall.
*
* NAME
* ntp_adjtime - NTP daemon application interface
*
* SYNOPSIS
* #include <freebsd/sys/timex.h>
* #include <freebsd/sys/syscall.h>
*
* int syscall(SYS_ntp_adjtime, tptr);
* int SYS_ntp_adjtime;
* struct timex *tptr;
*
* DESCRIPTION
* Certain fields of the timex structure are interpreted in either
* microseconds or nanoseconds according to the state of the
* STA_NANO bit in the status word. See the description below for
* further information.
*/
#ifndef _SYS_TIMEX_HH_
#define _SYS_TIMEX_HH_ 1
#define NTP_API 4 /* NTP API version */
#ifndef __rtems__
#ifndef MSDOS /* Microsoft specific */
#include <freebsd/sys/syscall.h>
#endif /* MSDOS */
#endif
/*
* The following defines establish the performance envelope of the
* kernel discipline loop. Phase or frequency errors greater than
* NAXPHASE or MAXFREQ are clamped to these maxima. For update intervals
* less than MINSEC, the loop always operates in PLL mode; while, for
* update intervals greater than MAXSEC, the loop always operates in FLL
* mode. Between these two limits the operating mode is selected by the
* STA_FLL bit in the status word.
*/
#define MAXPHASE 500000000L /* max phase error (ns) */
#define MAXFREQ 500000L /* max freq error (ns/s) */
#define MINSEC 256 /* min FLL update interval (s) */
#define MAXSEC 2048 /* max PLL update interval (s) */
#define NANOSECOND 1000000000L /* nanoseconds in one second */
#define SCALE_PPM (65536 / 1000) /* crude ns/s to scaled PPM */
#define MAXTC 10 /* max time constant */
/*
* The following defines and structures define the user interface for
* the ntp_gettime() and ntp_adjtime() syscalls.
*
* Control mode codes (timex.modes)
*/
#define MOD_OFFSET 0x0001 /* set time offset */
#define MOD_FREQUENCY 0x0002 /* set frequency offset */
#define MOD_MAXERROR 0x0004 /* set maximum time error */
#define MOD_ESTERROR 0x0008 /* set estimated time error */
#define MOD_STATUS 0x0010 /* set clock status bits */
#define MOD_TIMECONST 0x0020 /* set PLL time constant */
#define MOD_PPSMAX 0x0040 /* set PPS maximum averaging time */
#define MOD_TAI 0x0080 /* set TAI offset */
#define MOD_MICRO 0x1000 /* select microsecond resolution */
#define MOD_NANO 0x2000 /* select nanosecond resolution */
#define MOD_CLKB 0x4000 /* select clock B */
#define MOD_CLKA 0x8000 /* select clock A */
/*
* Status codes (timex.status)
*/
#define STA_PLL 0x0001 /* enable PLL updates (rw) */
#define STA_PPSFREQ 0x0002 /* enable PPS freq discipline (rw) */
#define STA_PPSTIME 0x0004 /* enable PPS time discipline (rw) */
#define STA_FLL 0x0008 /* enable FLL mode (rw) */
#define STA_INS 0x0010 /* insert leap (rw) */
#define STA_DEL 0x0020 /* delete leap (rw) */
#define STA_UNSYNC 0x0040 /* clock unsynchronized (rw) */
#define STA_FREQHOLD 0x0080 /* hold frequency (rw) */
#define STA_PPSSIGNAL 0x0100 /* PPS signal present (ro) */
#define STA_PPSJITTER 0x0200 /* PPS signal jitter exceeded (ro) */
#define STA_PPSWANDER 0x0400 /* PPS signal wander exceeded (ro) */
#define STA_PPSERROR 0x0800 /* PPS signal calibration error (ro) */
#define STA_CLOCKERR 0x1000 /* clock hardware fault (ro) */
#define STA_NANO 0x2000 /* resolution (0 = us, 1 = ns) (ro) */
#define STA_MODE 0x4000 /* mode (0 = PLL, 1 = FLL) (ro) */
#define STA_CLK 0x8000 /* clock source (0 = A, 1 = B) (ro) */
#define STA_RONLY (STA_PPSSIGNAL | STA_PPSJITTER | STA_PPSWANDER | \
STA_PPSERROR | STA_CLOCKERR | STA_NANO | STA_MODE | STA_CLK)
/*
* Clock states (time_state)
*/
#define TIME_OK 0 /* no leap second warning */
#define TIME_INS 1 /* insert leap second warning */
#define TIME_DEL 2 /* delete leap second warning */
#define TIME_OOP 3 /* leap second in progress */
#define TIME_WAIT 4 /* leap second has occured */
#define TIME_ERROR 5 /* error (see status word) */
/*
* NTP user interface (ntp_gettime()) - used to read kernel clock values
*
* Note: The time member is in microseconds if STA_NANO is zero and
* nanoseconds if not.
*/
struct ntptimeval {
struct timespec time; /* current time (ns) (ro) */
long maxerror; /* maximum error (us) (ro) */
long esterror; /* estimated error (us) (ro) */
long tai; /* TAI offset */
int time_state; /* time status */
};
/*
* NTP daemon interface (ntp_adjtime()) - used to discipline CPU clock
* oscillator and determine status.
*
* Note: The offset, precision and jitter members are in microseconds if
* STA_NANO is zero and nanoseconds if not.
*/
struct timex {
unsigned int modes; /* clock mode bits (wo) */
long offset; /* time offset (ns/us) (rw) */
long freq; /* frequency offset (scaled PPM) (rw) */
long maxerror; /* maximum error (us) (rw) */
long esterror; /* estimated error (us) (rw) */
int status; /* clock status bits (rw) */
long constant; /* poll interval (log2 s) (rw) */
long precision; /* clock precision (ns/us) (ro) */
long tolerance; /* clock frequency tolerance (scaled
* PPM) (ro) */
/*
* The following read-only structure members are implemented
* only if the PPS signal discipline is configured in the
* kernel. They are included in all configurations to insure
* portability.
*/
long ppsfreq; /* PPS frequency (scaled PPM) (ro) */
long jitter; /* PPS jitter (ns/us) (ro) */
int shift; /* interval duration (s) (shift) (ro) */
long stabil; /* PPS stability (scaled PPM) (ro) */
long jitcnt; /* jitter limit exceeded (ro) */
long calcnt; /* calibration intervals (ro) */
long errcnt; /* calibration errors (ro) */
long stbcnt; /* stability limit exceeded (ro) */
};
#ifdef __FreeBSD__
#ifdef _KERNEL
void ntp_update_second(int64_t *adjustment, time_t *newsec);
#else /* !_KERNEL */
#include <freebsd/sys/cdefs.h>
__BEGIN_DECLS
int ntp_adjtime(struct timex *);
int ntp_gettime(struct ntptimeval *);
__END_DECLS
#endif /* _KERNEL */
#endif /* __FreeBSD__ */
#endif /* !_SYS_TIMEX_HH_ */