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| author | njl <njl@FreeBSD.org> | 2005-02-24 20:28:41 +0000 |
|---|---|---|
| committer | njl <njl@FreeBSD.org> | 2005-02-24 20:28:41 +0000 |
| commit | 9ae8ecd514737a3f7215a2395a0488c017bbf488 (patch) | |
| tree | b73e27e68a0181f0d8d47a5118faf0fef8fadde6 /share/man/man7 | |
| parent | 82088e2e10225f47b70b5977462c757282d75946 (diff) | |
| download | FreeBSD-src-9ae8ecd514737a3f7215a2395a0488c017bbf488.zip FreeBSD-src-9ae8ecd514737a3f7215a2395a0488c017bbf488.tar.gz | |
Note the ACPI clock and its characteristics.
Diffstat (limited to 'share/man/man7')
| -rw-r--r-- | share/man/man7/clocks.7 | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/share/man/man7/clocks.7 b/share/man/man7/clocks.7 index 74af31d..1e1c635 100644 --- a/share/man/man7/clocks.7 +++ b/share/man/man7/clocks.7 @@ -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 |
