mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-22 09:43:47 +00:00
Brucifixion ? Yes, out that door, row on the left, one patch each.
Many thanks to: bde
This commit is contained in:
Poul-Henning Kamp
parent
9c30ce571e
commit
39acc78a1e
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=95821
|
|
@ -1,4 +1,4 @@
|
|||
/*
|
||||
/*-
|
||||
* ----------------------------------------------------------------------------
|
||||
* "THE BEER-WARE LICENSE" (Revision 42):
|
||||
* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
|
||||
|
|
@ -12,17 +12,19 @@
|
|||
#include "opt_ntp.h"
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/timetc.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/sysctl.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/timex.h>
|
||||
#include <sys/timetc.h>
|
||||
#include <sys/timepps.h>
|
||||
#include <sys/timex.h>
|
||||
|
||||
#include <machine/psl.h>
|
||||
|
||||
/*
|
||||
* 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
|
||||
* timeservices.
|
||||
* time services.
|
||||
*/
|
||||
|
||||
static u_int
|
||||
|
|
@ -34,11 +36,7 @@ dummy_get_timecount(struct timecounter *tc)
|
|||
}
|
||||
|
||||
static struct timecounter dummy_timecounter = {
|
||||
dummy_get_timecount,
|
||||
0,
|
||||
~0u,
|
||||
1000000,
|
||||
"dummy"
|
||||
dummy_get_timecount, 0, ~0u, 1000000, "dummy",
|
||||
};
|
||||
|
||||
struct timehands {
|
||||
|
|
@ -50,26 +48,25 @@ struct timehands {
|
|||
struct bintime th_offset;
|
||||
struct timeval th_microtime;
|
||||
struct timespec th_nanotime;
|
||||
/* Fields not to be copied in tc_windup start with th_generation */
|
||||
/* Fields not to be copied in tc_windup start with th_generation. */
|
||||
volatile u_int th_generation;
|
||||
struct timehands *th_next;
|
||||
};
|
||||
|
||||
|
||||
extern struct timehands th0;
|
||||
static struct timehands th9 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 1, &th0};
|
||||
static struct timehands th8 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 1, &th9};
|
||||
static struct timehands th7 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 1, &th8};
|
||||
static struct timehands th6 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 1, &th7};
|
||||
static struct timehands th5 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 1, &th6};
|
||||
static struct timehands th4 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 1, &th5};
|
||||
static struct timehands th3 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 1, &th4};
|
||||
static struct timehands th2 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 1, &th3};
|
||||
static struct timehands th1 = { NULL, 0, 0, 0, {0, 0}, {0, 0}, {0, 0}, 1, &th2};
|
||||
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,
|
||||
18446744073709ULL, /* 2^64/1000000 */
|
||||
(uint64_t)-1 / 1000000,
|
||||
0,
|
||||
{1, 0},
|
||||
{0, 0},
|
||||
|
|
@ -84,8 +81,8 @@ static struct timecounter *timecounters = &dummy_timecounter;
|
|||
|
||||
time_t time_second;
|
||||
|
||||
struct bintime boottimebin;
|
||||
struct timeval boottime;
|
||||
static struct bintime boottimebin;
|
||||
struct timeval boottime;
|
||||
SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD,
|
||||
&boottime, timeval, "System boottime");
|
||||
|
||||
|
|
@ -93,7 +90,8 @@ SYSCTL_NODE(_kern, OID_AUTO, timecounter, CTLFLAG_RW, 0, "");
|
|||
|
||||
#define TC_STATS(foo) \
|
||||
static u_int foo; \
|
||||
SYSCTL_INT(_kern_timecounter, OID_AUTO, foo, CTLFLAG_RD, & foo, 0, "")
|
||||
SYSCTL_INT(_kern_timecounter, OID_AUTO, foo, CTLFLAG_RD, &foo, 0, "") \
|
||||
struct __hack
|
||||
|
||||
TC_STATS(nbinuptime); TC_STATS(nnanouptime); TC_STATS(nmicrouptime);
|
||||
TC_STATS(nbintime); TC_STATS(nnanotime); TC_STATS(nmicrotime);
|
||||
|
|
@ -104,8 +102,10 @@ TC_STATS(ngetbintime); TC_STATS(ngetnanotime); TC_STATS(ngetmicrotime);
|
|||
|
||||
static void tc_windup(void);
|
||||
|
||||
/* Get delta hardware ticks relative to our timehands */
|
||||
|
||||
/*
|
||||
* 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)
|
||||
{
|
||||
|
|
@ -116,10 +116,10 @@ tc_delta(struct timehands *th)
|
|||
tc->tc_counter_mask);
|
||||
}
|
||||
|
||||
/*-
|
||||
/*
|
||||
* Functions for reading the time. We have to loop until we are sure that
|
||||
* the timehands we operated on was not updated under our feet.
|
||||
* See comment in <sys/time.h> for description of these 12 functions.
|
||||
* 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
|
||||
|
|
@ -138,25 +138,27 @@ binuptime(struct bintime *bt)
|
|||
}
|
||||
|
||||
void
|
||||
nanouptime(struct timespec *ts)
|
||||
nanouptime(struct timespec *tsp)
|
||||
{
|
||||
struct bintime bt;
|
||||
|
||||
nnanouptime++;
|
||||
binuptime(&bt);
|
||||
bintime2timespec(&bt, ts);
|
||||
bintime2timespec(&bt, tsp);
|
||||
}
|
||||
|
||||
void
|
||||
microuptime(struct timeval *tv)
|
||||
microuptime(struct timeval *tvp)
|
||||
{
|
||||
struct bintime bt;
|
||||
|
||||
nmicrouptime++;
|
||||
binuptime(&bt);
|
||||
bintime2timeval(&bt, tv);
|
||||
bintime2timeval(&bt, tvp);
|
||||
}
|
||||
|
||||
#define SYNC_TIME
|
||||
|
||||
void
|
||||
bintime(struct bintime *bt)
|
||||
{
|
||||
|
|
@ -167,23 +169,23 @@ bintime(struct bintime *bt)
|
|||
}
|
||||
|
||||
void
|
||||
nanotime(struct timespec *ts)
|
||||
nanotime(struct timespec *tsp)
|
||||
{
|
||||
struct bintime bt;
|
||||
|
||||
nnanotime++;
|
||||
bintime(&bt);
|
||||
bintime2timespec(&bt, ts);
|
||||
bintime2timespec(&bt, tsp);
|
||||
}
|
||||
|
||||
void
|
||||
microtime(struct timeval *tv)
|
||||
microtime(struct timeval *tvp)
|
||||
{
|
||||
struct bintime bt;
|
||||
|
||||
nmicrotime++;
|
||||
bintime(&bt);
|
||||
bintime2timeval(&bt, tv);
|
||||
bintime2timeval(&bt, tvp);
|
||||
}
|
||||
|
||||
void
|
||||
|
|
@ -271,13 +273,12 @@ getmicrotime(struct timeval *tvp)
|
|||
} while (gen == 0 || gen != th->th_generation);
|
||||
}
|
||||
|
||||
/*-
|
||||
/*
|
||||
* Initialize a new timecounter.
|
||||
* We should really try to rank the timecounters and intelligently determine
|
||||
* if the new timecounter is better than the current one. This is subject
|
||||
* to further study. For now always use the new timecounter.
|
||||
*/
|
||||
|
||||
void
|
||||
tc_init(struct timecounter *tc)
|
||||
{
|
||||
|
|
@ -286,13 +287,12 @@ tc_init(struct timecounter *tc)
|
|||
timecounters = tc;
|
||||
printf("Timecounter \"%s\" frequency %lu Hz\n",
|
||||
tc->tc_name, (u_long)tc->tc_frequency);
|
||||
tc->tc_get_timecount(tc);
|
||||
tc->tc_get_timecount(tc);
|
||||
(void)tc->tc_get_timecount(tc);
|
||||
(void)tc->tc_get_timecount(tc);
|
||||
timecounter = tc;
|
||||
}
|
||||
|
||||
/* Report frequency of the current timecounter. */
|
||||
|
||||
/* Report the frequency of the current timecounter. */
|
||||
u_int32_t
|
||||
tc_getfrequency(void)
|
||||
{
|
||||
|
|
@ -300,7 +300,7 @@ tc_getfrequency(void)
|
|||
return (timehands->th_counter->tc_frequency);
|
||||
}
|
||||
|
||||
/*-
|
||||
/*
|
||||
* Step our concept of GMT. This is done by modifying our estimate of
|
||||
* when we booted. XXX: needs futher work.
|
||||
*/
|
||||
|
|
@ -311,34 +311,33 @@ tc_setclock(struct timespec *ts)
|
|||
|
||||
nanouptime(&ts2);
|
||||
boottime.tv_sec = ts->tv_sec - ts2.tv_sec;
|
||||
/* XXX boottime should probably be a timespec. */
|
||||
boottime.tv_usec = (ts->tv_nsec - ts2.tv_nsec) / 1000;
|
||||
if (boottime.tv_usec < 0) {
|
||||
boottime.tv_usec += 1000000;
|
||||
boottime.tv_sec--;
|
||||
}
|
||||
timeval2bintime(&boottime, &boottimebin);
|
||||
/* fiddle all the little crinkly bits around the fiords... */
|
||||
|
||||
/* XXX fiddle all the little crinkly bits around the fiords... */
|
||||
tc_windup();
|
||||
}
|
||||
|
||||
/*-
|
||||
* tc_windup() will initialize the next struct timehands in the ring and make
|
||||
/*
|
||||
* 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 timehands *th, *tho;
|
||||
struct bintime bt;
|
||||
u_int ogen, delta, ncount;
|
||||
int i;
|
||||
struct timehands *th, *tho;
|
||||
u_int64_t scale;
|
||||
u_int delta, ncount, ogen;
|
||||
int i;
|
||||
|
||||
ncount = 0; /* GCC is lame */
|
||||
|
||||
/*-
|
||||
/*
|
||||
* 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.
|
||||
|
|
@ -347,9 +346,9 @@ tc_windup(void)
|
|||
th = tho->th_next;
|
||||
ogen = th->th_generation;
|
||||
th->th_generation = 0;
|
||||
bcopy(tho, th, __offsetof(struct timehands, th_generation));
|
||||
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.
|
||||
|
|
@ -357,11 +356,13 @@ tc_windup(void)
|
|||
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;
|
||||
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
|
||||
|
|
@ -372,10 +373,10 @@ tc_windup(void)
|
|||
if (tho->th_counter->tc_poll_pps)
|
||||
tho->th_counter->tc_poll_pps(tho->th_counter);
|
||||
|
||||
/*-
|
||||
* Deal with NTP second processing. The for() loop probably doesn't
|
||||
* do anything normally, but in a few extreme situations it might
|
||||
* keep timecounters sane if timeouts are not run for several seconds.
|
||||
/*
|
||||
* Deal with NTP second processing. The for loop normally only
|
||||
* iterates once, but in extreme situations it might keep NTP sane
|
||||
* if timeouts are not run for several seconds.
|
||||
*/
|
||||
for (i = th->th_offset.sec - tho->th_offset.sec; i > 0; i--)
|
||||
ntp_update_second(&th->th_adjustment, &th->th_offset.sec);
|
||||
|
|
@ -386,7 +387,7 @@ tc_windup(void)
|
|||
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)
|
||||
|
|
@ -407,9 +408,9 @@ tc_windup(void)
|
|||
*
|
||||
* We happily sacrifice the lowest of the 64 bits of our result
|
||||
* to the goddess of code clarity.
|
||||
*
|
||||
*/
|
||||
|
||||
scale = 1ULL << 63;
|
||||
scale = (u_int64_t)1 << 63;
|
||||
scale += (th->th_adjustment / 1024) * 2199;
|
||||
scale /= th->th_counter->tc_frequency;
|
||||
th->th_scale = scale * 2;
|
||||
|
|
@ -420,21 +421,20 @@ tc_windup(void)
|
|||
bintime2timeval(&bt, &th->th_microtime);
|
||||
bintime2timespec(&bt, &th->th_nanotime);
|
||||
|
||||
/*-
|
||||
* Now that the struct timehands is against consistent, set the new
|
||||
/*
|
||||
* Now that the struct timehands is again consistent, set the new
|
||||
* generation number, making sure to not make it zero.
|
||||
*/
|
||||
if (++ogen == 0)
|
||||
ogen++;
|
||||
ogen = 1;
|
||||
th->th_generation = ogen;
|
||||
|
||||
/* Go live on the new struct timehands */
|
||||
/* Go live with the new struct timehands. */
|
||||
time_second = th->th_microtime.tv_sec;
|
||||
timehands = th;
|
||||
}
|
||||
|
||||
/* Report or change active timecounter hardware. */
|
||||
|
||||
/* Report or change the active timecounter hardware. */
|
||||
static int
|
||||
sysctl_kern_timecounter_hardware(SYSCTL_HANDLER_ARGS)
|
||||
{
|
||||
|
|
@ -444,15 +444,19 @@ sysctl_kern_timecounter_hardware(SYSCTL_HANDLER_ARGS)
|
|||
|
||||
tc = timecounter;
|
||||
strncpy(newname, tc->tc_name, sizeof(newname));
|
||||
newname[sizeof(newname) - 1] = '\0';
|
||||
error = sysctl_handle_string(oidp, &newname[0], sizeof(newname), req);
|
||||
if (error != 0 && req->newptr == NULL && !strcmp(newname, tc->tc_name))
|
||||
return(error);
|
||||
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))
|
||||
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);
|
||||
}
|
||||
|
|
@ -462,7 +466,7 @@ sysctl_kern_timecounter_hardware(SYSCTL_HANDLER_ARGS)
|
|||
SYSCTL_PROC(_kern_timecounter, OID_AUTO, hardware, CTLTYPE_STRING | CTLFLAG_RW,
|
||||
0, 0, sysctl_kern_timecounter_hardware, "A", "");
|
||||
|
||||
/*-
|
||||
/*
|
||||
* RFC 2783 PPS-API implementation.
|
||||
*/
|
||||
|
||||
|
|
@ -549,17 +553,17 @@ pps_capture(struct pps_state *pps)
|
|||
void
|
||||
pps_event(struct pps_state *pps, int event)
|
||||
{
|
||||
struct bintime bt;
|
||||
struct timespec ts, *tsp, *osp;
|
||||
u_int tcount, *pcount;
|
||||
struct bintime bt;
|
||||
int foff, fhard;
|
||||
pps_seq_t *pseq;
|
||||
pps_seq_t *pseq;
|
||||
|
||||
/* If the timecounter were wound up, bail. */
|
||||
if (!pps->capgen || pps->capgen != pps->capth->th_generation)
|
||||
/* 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... */
|
||||
/* Things would be easier with arrays. */
|
||||
if (event == PPS_CAPTUREASSERT) {
|
||||
tsp = &pps->ppsinfo.assert_timestamp;
|
||||
osp = &pps->ppsparam.assert_offset;
|
||||
|
|
@ -576,7 +580,7 @@ pps_event(struct pps_state *pps, int event)
|
|||
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.
|
||||
*/
|
||||
|
|
@ -587,18 +591,18 @@ pps_event(struct pps_state *pps, int event)
|
|||
return;
|
||||
}
|
||||
|
||||
/* Nothing really happened */
|
||||
/* Return if nothing really happened. */
|
||||
if (*pcount == pps->capcount)
|
||||
return;
|
||||
|
||||
/* Convert the count to timespec */
|
||||
/* 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);
|
||||
bintime2timespec(&bt, &ts);
|
||||
|
||||
/* If the timecounter were wound up, bail. */
|
||||
/* If the timecounter was wound up underneath us, bail out. */
|
||||
if (pps->capgen != pps->capth->th_generation)
|
||||
return;
|
||||
|
||||
|
|
@ -615,7 +619,7 @@ pps_event(struct pps_state *pps, int event)
|
|||
}
|
||||
#ifdef PPS_SYNC
|
||||
if (fhard) {
|
||||
/*-
|
||||
/*
|
||||
* Feed the NTP PLL/FLL.
|
||||
* The FLL wants to know how many nanoseconds elapsed since
|
||||
* the previous event.
|
||||
|
|
@ -636,13 +640,11 @@ pps_event(struct pps_state *pps, int event)
|
|||
#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.
|
||||
* Don't update faster than approx once per millisecond, if people want
|
||||
* better timestamps they should use the non-"get" functions.
|
||||
*/
|
||||
|
||||
static int tc_tick;
|
||||
|
|
@ -661,12 +663,24 @@ 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);
|
||||
tc_ticktock(NULL);
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue