From: Philippe Gerum <rpm@xenomai.org>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-core] some results on my laptop
Date: Fri, 03 Feb 2006 09:58:49 +0100 [thread overview]
Message-ID: <43E31B49.8050101@domain.hid> (raw)
In-Reply-To: <43E313BF.2010104@domain.hid>
Jan Kiszka wrote:
> Jan Kiszka wrote:
>
>>...
>>What about other time sources on x86? Which systems already have HPET
>>these days, and does this source not suffer from frequency scaling? I
>>once read that HPET is quite easy to program, is this true? IOW, would
>>it be worth considering to add this to the HAL?
>
>
> There are actually only few registers:
>
> http://www.intel.com/hardwaredesign/hpetspec_1.pdf
>
> Even a replacement for the TSC is available ("Main Counter"), but I
> guess that some effort will be required to replace all direct usages of
> rdtsc in the current Xenomai code, right?
>
There should not be any direct usage, at least into the generic code, since it is
aimed at running over the event-driven simulator too. Actually, the same goes for
the x86-specific code, since we do support using the 8254 as an alternative to the
TSC.
> Jan
>
--
Philippe.
next prev parent reply other threads:[~2006-02-03 8:58 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-02 22:33 [Xenomai-core] some results on my laptop Jim Cromie
2006-02-02 22:59 ` Philippe Gerum
2006-02-03 0:26 ` Jim Cromie
2006-02-03 7:51 ` Philippe Gerum
2006-02-03 8:17 ` Jan Kiszka
2006-02-03 8:26 ` Jan Kiszka
2006-02-03 8:58 ` Philippe Gerum [this message]
2006-02-03 9:18 ` Anders Blomdell
2006-02-03 9:26 ` Jan Kiszka
2006-02-03 9:14 ` Anders Blomdell
2006-02-03 9:35 ` Jan Kiszka
2006-02-03 10:01 ` Anders Blomdell
2006-02-03 10:20 ` Jan Kiszka
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