PERFORCE change 96885 for review

[John Birrell]

http://perforce.freebsd.org/chv.cgi?CH=96885

Change 96885 by jb at jb_freebsd2 on 2006/05/09 22:27:45

	Add the machine-dependent backend for the cyclic subsystem.
	
	This defaults to use the interrupt that drives hardclock because
	on most Intel processors that's the best time-based interrupt
	source.
	
	To-Do: detect the presence of the HPET and use that if it. It will
	need to be enabled/disabled/reprogrammed so that it only interrupts
	when there is a pending cyclic timer and only at the next
	interval.

Affected files ...

.. //depot/projects/dtrace/src/sys/cddl/i386/cyclic_machdep.c#1 add

Differences ...