On Wed, May 28, 2008 at 6:19 PM, Raz <raziebe@gmail.com> wrote:
quoted text
> I am wondering wether someone can explain how hpet behaves. The bellow
> is a short program that reads from a mmaped /dev/hpet the time. I am
> running it and it looks that afer ~296 seconds the counter resets . I
> AM RUNNING  64bi KERNEL(2.6.18-8.el5)  and reading a 64BIT VARIABLE.
> my hpet is 14MHZ, so I  am guessing a 32bit wraparound ( ~296 * 14Mhz
> ) =  MAX_INT . but why ?
>

HPET counter can be either 32 or 64 bit.  Check COUNT_SIZE_CAP.

http://www.intel.com/hardwaredesign/hpetspec_1.pdf

Lee
--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/