From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: ali hagigat <hagigatali@gmail.com>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai] the Linux kernel and operating system
Date: Sun, 17 Jun 2012 16:12:44 +0200 [thread overview]
Message-ID: <4FDDE5DC.4030608@xenomai.org> (raw)
In-Reply-To: <CAKKWdtdvPGDsz3fJz0b64bPELR9RH92B3a=nPCCPtga7ZVUwNg@mail.gmail.com>
On 06/17/2012 02:55 PM, ali hagigat wrote:
> I think SMI needs some initialization from BIOS and then Linux kernel.
> The Linux kernel has some CONFIG_ variables to disable/enable SMI.
Last time I checked, the linux kernel did not have such CONFIG_
variables, which is why xenomai adds them.
> In theory a motherboard can be built to generate SMI without the
> software help. But I think OEMs do not build such a board. So I think
> an x86 PC hard real time system is possible for today's PCs.
>
> Please correct me if I am wrong.
An SMI is an interrupt, so, there must be software to handle the SMI,
so, no, a motherboard can not be built to generate SMI without software
help.
Intel chipsets provide a register to disable SMIs, but also provide a
register to lock usage of the first register. So yes, there are some PC
today that you can not use for real-time. Unless, of course, you are
ready to use your own BIOS instead of the one provided by the hardware
vendor, or your hardware vendor is willing to change the BIOS.
--
Gilles.
next prev parent reply other threads:[~2012-06-17 14:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-09 9:13 [Xenomai] the Linux kernel and operating system ali hagigat
2012-06-09 10:08 ` abhrajit
2012-06-09 22:26 ` Philippe Gerum
2012-06-11 14:14 ` Lennart Sorensen
2012-06-17 12:55 ` ali hagigat
2012-06-17 14:12 ` Gilles Chanteperdrix [this message]
2012-06-18 14:08 ` Lennart Sorensen
2012-06-19 11:51 ` ali hagigat
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