linux-kernel - Re: [PATCH] ACPI: Implement overriding of arbitrary ACPI tables via initrd

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Message-ID: <4F6FAA63.2020107@zytor.com>
Date:	Sun, 25 Mar 2012 16:29:39 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Thomas Renninger <trenn@...e.de>, eric.piel@...mplin-utc.net,
	vojcek@...n.pl, dsdt@...gusch.at, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Lin Ming <ming.m.lin@...el.com>, lenb@...nel.org,
	robert.moore@...el.com, Al Viro <viro@...iv.linux.org.uk>,
	Harald Hoyer <harald@...hat.com>
Subject: Re: [PATCH] ACPI: Implement overriding of arbitrary ACPI tables via
 initrd

On 03/25/2012 02:25 AM, Borislav Petkov wrote:
> 
>> /*
>>  * findcpio.c
>>  *
>>  * Find a specific cpio member; must precede any compressed content.
> 
> Looks simple enough. Btw, there's some cpio handling already done in
> <init/initramfs.c> - probably reuse some of the code there...?
> 

Quite possible, but then you will have to untangle the dependencies.
Keep in mind that it needs to be able to compile this in such a way that
you have no library dependencies and no fixed address references (so
that it can be invoked from the pre-paging code to get microcode updates
in as early as at all possible.)  So code reuse is a bit tricky at least
for that specific use case.  The ACPI code is less sensitive since it
comes a lot later.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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