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Manual Pages  — ATRTC

NAME

atrtc – AT Real-Time Clock (RTC) driver

CONTENTS

SYNOPSIS

This driver is a mandatory part of i386/amd64 kernels.

The following tunable is settable from the loader(8):
hint.atrtc.X .clock controls event timers functionality support. Setting to 0, disables it. Default value is 1.

DESCRIPTION

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.

SEE ALSO

apic(4), attimer(4), eventtimers(4), hpet(4)

ATRTC (4) September 17, 2010

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Please direct any comments about this manual page service to Ben Bullock.

This philosophy, in the hands of amateurs, leads to inexplicably mind-numbing botches like the existence of two programs, “head” and “tail,” which print the first part or the last part of a file, depending. Even though their operations are duals of one another, “head” and “tail” are different programs, written by different authors, and take different options!
— The Unix Haters' handbook