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Note the ACPI clock and its characteristics.

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This commit is contained in:
Nate Lawson 2005-02-24 20:28:41 +00:00
parent d269386a24
commit e104f88a15
1 changed files with 8 additions and 1 deletions
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9
share/man/man7/clocks.7
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@ -27,7 +27,7 @@
.\"
.\" $FreeBSD$
.\" "
.Dd April 1, 1996
.Dd February 24, 2005
.Os
.Dt CLOCKS 7
.Sh NAME
@ -148,6 +148,13 @@ It can be accessed using the
.Dv PMIOTSTAMP
request of
.Xr perfmon 4 .
.It
The ACPI clock.
This is a real clock/timer with a nominal frequency of 3579545.
It is accessed via a 24 or 32 bit register.
Unlike the TSC clock, it maintains a constant tick rate even when the CPU
sleeps or its clock rate changes.
It is not available to applications.
.El
.Pp
Summary: if