linux-kernel - Re: [x86] fs, gs purpose & multicore prog

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Message-ID: <48C21759.4020503@goop.org>
Date:	Fri, 05 Sep 2008 22:38:33 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Eric Lacombe <goretux@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [x86] fs, gs purpose & multicore prog

Eric Lacombe wrote:
> I know these things ;) but what I wanted to know is the "x86 architectural 
> details". In fact, I saw that during the machine init the BIOS select a cpu on 
> the bus to be the BSP (bootstrap proc). The others are then the APs (Appli 
> proc). Then the kernel runs on the BSP. What I wonder is how the kernel gives 
> execution flow to the APs.
>   

See arch/x86/kernel/smpboot.c (esp do_boot_cpu()), and chapter 7 of
"Intel® 64 and IA-32 Architectures Software Developer’s Manual", volume 3a.

    J
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