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Man Pages
ATRTC(4) FreeBSD Kernel Interfaces Manual ATRTC(4)

atrtc
AT Real-Time Clock (RTC) driver

This driver is a mandatory part of i386/amd64 kernels.
The following tunables are settable from the loader(8):
hint.atrtc.X.clock
controls event timers functionality support. Setting to 0, disables it. Default value is 1.
hw.atrtc.enable
Forces enabling or disabling of the device(s). Setting to 0 disables it, setting to 1 enables it, bypassing any platform configuration hints. Default value is -1 (autodetect).

This driver uses RTC hardware to supply kernel with time-of-day clock with 1 second resolution and one event timer. This hardware uses base frequency of 32768Hz for advancing time-of-day clock and generating periodic interrupts. Interrupts could be generated with fixed number of frequencies, from 2Hz to 8192Hz, obtained by dividing base frequency by one of supported power-of-2 divisors.
Event timer provided by the driver is irrelevant to CPU power states.

apic(4), attimer(4), eventtimers(4), hpet(4)
September 17, 2010 FreeBSD 12.0-RELEASE

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