linux-kernel - Re: [PATCH v2 08/20] x86, ACPI: Find acpi tables in initrd early from head

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Message-ID: <a2b9bc9e-ccff-483a-a73c-2b4993a413d2@email.android.com>
Date:	Sun, 10 Mar 2013 10:42:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>, Pekka Enberg <penberg@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Thomas Renninger <trenn@...e.de>,
	Tang Chen <tangchen@...fujitsu.com>,
	linux-kernel@...r.kernel.org, Jacob Shin <jacob.shin@....com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 08/20] x86, ACPI: Find acpi tables in initrd early from head_32.S/head64.c

There is no 64-bit flat mode.  We use a #PF handler to emulate one by creating page tables on the fly.

Yinghai Lu <yinghai@...nel.org> wrote:

>On Sun, Mar 10, 2013 at 3:25 AM, Pekka Enberg <penberg@...nel.org>
>wrote:
>>
>> What is preventing us from making the 64-bit variant also work in
>flat
>> mode to make the code consistent and not hiding the differences under
>> the rug? What am I missing here?
>
>Boot loader could start kernel from 64bit directly from
>from arch/x86/boot/compressed/head_64.s::startup_64.
>
>initrd can be loaded by 64bit bootloader above 4G.
>
>So we even switch back to 32bit flat mode, we still can not access
>those initrd
>directly.
>
>Thanks
>
>Yinghai

-- 
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