linux-kernel - Re: [PATCH] i386-pda: Initialize the PDA early, before any C code runs.

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Message-Id: <20060911160301.10789d6e.akpm@osdl.org>
Date:	Mon, 11 Sep 2006 16:03:01 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andi Kleen <ak@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i386-pda: Initialize the PDA early, before any C code
 runs.

On Mon, 11 Sep 2006 15:52:49 -0700
Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Initialize the PDA early, before any C code runs.
> 
> This patch makes sure the PDA is usable in head.S, before any C code
> is run.
> 
> On the boot CPU, this is done by using a temporary boot_pda which is
> initialized appropriately.  It is replaced with a proper PDA when the
> proper GDT is installed.
> 
> For secondary CPUs, the GDT and PDA are pre-allocated and initialized.
> head.S just needs to set %gs and load the GDT.
> 
> In the process, this removes the need for early_smp_processor_id() and
> early_current().
> 
> ...
>
> +/* Initial PDA used by boot CPU */
> +struct i386_pda boot_pda = {
> +	._pda = &boot_pda,
> +	.cpu_number = 0,
> +	.pcurrent = &init_task,
> +};

What is likely to happen if the boot CPU is not CPU #0?  (iirc Voyager does
that?)

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