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

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Message-ID: <CAE9FiQWQm0K2yywRisTRmFJmnpMpVsg6Ewh=swaZC2aM9ZKQQw@mail.gmail.com>
Date:	Sun, 10 Mar 2013 09:47:18 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	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

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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