CVS commit: src/sys/arch/arm/cortex

["Jared D. McNeill" <jmcneill%netbsd.org@localhost>]

Module Name:    src
Committed By:   jmcneill
Date:           Mon Mar 23 23:33:22 UTC 2015

Modified Files:
        src/sys/arch/arm/cortex: gtmr.c

Log Message:
port-arm/49737: armgtmr0 timer broken

Use physical timer instead of virtual timer for timecounter. For platforms
that implement virtualization extensions, the CNTVOFF register defines a
virtual offset between the physical count and virtual count. Unfortunately,
the CNTVOFF register is only accessible in secure mode and the value is
per-CPU, so we may end up in a scenario where virtual count reads from
CPU A -> B -> A are not monotonic. No offset applied to physical timer,
so physical count reads are guaranteed to be monotonic.


To generate a diff of this commit:
cvs rdiff -u -r1.9 -r1.10 src/sys/arch/arm/cortex/gtmr.c

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