pps_ref_event() allows capturing PPS time stamps
that are not generated at precisely 1Hz (e. g.
by reading a precision clock via callout()).
This extension allows clock drivers to supply PPS
time-stamps and drive the kernel NTP PLL
without the overhead of interrupt-handling and
-processing.
may change during loops. Fixes the macppc build, which previously
died with:
src/sys/arch/macppc/dev/dbdma.c:62:6: error: assuming signed overflow does not occur when assuming that (X + c) < X is always false
by making the pps count time stamp and the update
time stamp u_int64.
The time delta between two PPS events can now
be correctly calculated avoiding any unaccounted
for wraps with 32-bit counters.
- Fix a preemption bug in CURCPU_IDLE_P() that can lead to a bogus
assertion failure on DEBUG kernels.
- Fix MP/preemption races with timecounter detachment.
in tc_init() with splclock(). Fixes doubled-up "selected timecounter"
messages on some architectures, including pc532 and cobalt.
Fix suggested by Frank Kardel.
struct actually keeps the start of the UTC
time scale and not the boot time. the relationship
is: utc-time = up-time + timebase.
background: when doing an ACPI sleep the uptime
freezes and on wakeup the tc_setclock() leads to
a new timebasebin - this had no relationship with
a boottime as the structure was previously called.
discussed on tech-kern@
anomalies (moving boottime, uptime describing running time)
where discovered by Arnaud Lacombe.
- struct timeval time is gone
time.tv_sec -> time_second
- struct timeval mono_time is gone
mono_time.tv_sec -> time_uptime
- access to time via
{get,}{micro,nano,bin}time()
get* versions are fast but less precise
- support NTP nanokernel implementation (NTP API 4)
- further reading:
Timecounter Paper: http://phk.freebsd.dk/pubs/timecounter.pdf
NTP Nanokernel: http://www.eecis.udel.edu/~mills/ntp/html/kern.html
