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From: Eric Lacombe <tuxiko@free.fr>
To: linux-kernel@vger.kernel.org
Cc: goretux@gmail.com
Subject: [x86] fs, gs purpose & multicore prog
Date: Wed, 3 Sep 2008 11:09:45 +0200	[thread overview]
Message-ID: <200809031109.45660.goretux@gmail.com> (raw)

Hello,

I've some questions about IA-32e in Linux.

- What is the FS and GS segments role inside the kernel ?
(I was thinking about thread local storage)

- When I do a "mov %fs ..." instruction (in a module), it seems that %fs is 
equal to 0 (idem for %gs). Are these registers not always filled ?

- What is the purpose of MSR_FS_BASE and MSR_GS_BASE ? 
(I thought they were filled with "gdt[fs_entry].base")

- My last question is about the kernel programation of multi-core (or 
multiprocessor)
architecture. I don't see a lot of documentation about that on Internet.
Do you have some docs/urls about this topic.
Maybe someone can briefly explain how the execution flow are given to the 
different cores.

Thanks in advance.

        Eric

             reply	other threads:[~2008-09-03  9:09 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-09-03  9:09 Eric Lacombe [this message]
2008-09-04 16:49 ` [x86] fs, gs purpose & multicore prog Jeremy Fitzhardinge
2008-09-05 11:17   ` Eric Lacombe
2008-09-05 14:51     ` Jeremy Fitzhardinge
2008-09-05 23:09       ` Eric Lacombe
2008-09-06  5:38         ` Jeremy Fitzhardinge

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