CVS commit: [netbsd-7] src/sys/arch/arm/cortex

["Soren Jacobsen" <snj%netbsd.org@localhost>]

Module Name:    src
Committed By:   snj
Date:           Mon Apr  6 01:55:53 UTC 2015

Modified Files:
        src/sys/arch/arm/cortex [netbsd-7]: gtmr.c

Log Message:
Pull up following revision(s) (requested by skrll in ticket #662):
        sys/arch/arm/cortex/gtmr.c: revision 1.10-1.14
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.
--
Sprinkle some arm_isb() to force execution of the mcrr instructions to get
more accurate values.  (Given that the generic timer is usually running at
a 64th or less of the cpu clock, this only settle to a tick or so.)
--
Move isb's to before reading count.  Change interrupt to level.
--
Trailing whitespace.
--
Whitespace


To generate a diff of this commit:
cvs rdiff -u -r1.8.2.1 -r1.8.2.2 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.