CVS commit: src/sys/arch/x86/x86

[Joerg Sonnenberger <joerg%netbsd.org@localhost>]

Module Name:    src
Committed By:   joerg
Date:           Fri Jan 25 18:50:22 UTC 2008

Modified Files:
        src/sys/arch/x86/x86: lapic.c

Log Message:
Simplify the calibration code a great bit by just waiting around 100ms
polling the i8254 as reference and counting the cycles with that.
Disable interrupts. This should be relatively stable even in the light
of SMIs as long as they happen in the middle of the loop. This fixes
long delays during boot.

If greater precision for the calibration is desired, a second run should
be done at a different time when the HPET or ACPI timer is present. Both
provide much faster access (less jitter) and a higher frequency.


To generate a diff of this commit:
cvs rdiff -r1.31 -r1.32 src/sys/arch/x86/x86/lapic.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.