From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] ACPI: Implement overriding of arbitrary ACPI tables via
 initrd
Date: Sun, 25 Mar 2012 16:29:39 -0700
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To: Borislav Petkov <bp@alien8.de>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Thomas Renninger <trenn@suse.de>, eric.piel@tremplin-utc.net, vojcek@tlen.pl, dsdt@gaugusch.at, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, Lin Ming <ming.m.lin@intel.com>, lenb@kernel.org, robert.moore@intel.com, Al Viro <viro@zeniv.linux.org.uk>, Harald Hoyer <harald@redhat.com>

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.