This touches only MI code, and adds new time keeping code. The

code is all conditionalized on __HAVE_TIMECOUNTER, and not
enabled on any platforms.

adjtime(2) support exists, courtesy of nordin@, sysctl(2) support
and a concept of quality for each time source attached exists.

High quality time sources exists for PIIX4 ACPI timer as well as
some AMD power management chips.  This will have to be redone
once we actually add ACPI support (at that time we need to use
the ACPI interfaces to get at these clocks).

ok art@ ken@ miod@ jmc@ and many more

1 files changed, 29 insertions, 1 deletions

diff --git a/lib/libc/gen/sysctl.3 b/lib/libc/gen/sysctl.3
index 229455bab6d..e132cb41635 100644
--- a/lib/libc/gen/sysctl.3
+++ b/lib/libc/gen/sysctl.3
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: sysctl.3,v 1.139 2004/06/03 17:09:12 espie Exp $
+.\"	$OpenBSD: sysctl.3,v 1.140 2004/07/28 17:15:12 tholo Exp $
 .\"
 .\" Copyright (c) 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -385,6 +385,7 @@ information.
 .It Dv KERN_SYSVMSG No "	integer	no"
 .It Dv KERN_SYSVSEM No "	integer	no"
 .It Dv KERN_SYSVSHM No "	integer	no"
+.It Dv KERN_TIMECOUNTER No "	node	not applicable"
 .It Dv KERN_TTY No "	node	not applicable"
 .It Dv KERN_TTYCOUNT No "	integer	no"
 .It Dv KERN_USERASYMCRYPTO No "	integer	yes"
@@ -836,6 +837,33 @@ system, otherwise 0.
 .It Dv KERN_SYSVSHM
 Returns 1 if System V style share memory functionality is available on this
 system, otherwise 0.
+.It Dv KERN_TIMECOUNTER
+Return statistics information about the kernel time counter.
+The third level names information is detailed below.
+The changeable column shows whether a process with appropriate
+privileges may change the value.
+.Bl -column "KERN_TIMECOUNTER_TIMESTEPWARNINGS" "integer" -offset indent
+.It Sy Third level name	Type	Changeable
+.It Dv KERN_TIMECOUNTER_CHOICE No "	string	no"
+.It Dv KERN_TIMECOUNTER_HARDWARE No "	string	yes"
+.It Dv KERN_TIMECOUNTER_TICK No "	integer	no"
+.It Dv KERN_TIMECOUNTER_TIMESTEPWARNINGS No "	integer	no"
+.El
+.Pp
+The variables are as follows:
+.Bl -tag -width "123456"
+.It Dv KERN_TIMECOUNTER_CHOICE
+Get the list of kernel time counter sources and their claimed
+quality (higher is better).
+.It Dv KERN_TIMECOUNTER_HARDWARE
+Get or set the kernel time counter source by name.
+.It Dv KERN_TIMECOUNTER_TICK
+Get the number of times we have reset the kernel time counter
+information.
+.It Dv KERN_TIMECOUNTER_TIMESTEPWARNINGS
+Get or set a flag to log a message when the kernel time is
+stepped.
+.El
 .It Dv KERN_TTY
 Return statistics information about tty input/output.
 The third level names information is detailed below.