On 08/30/2012 02:29 AM, Thomas Renninger wrote:
From: "H. Peter Anvin" <[email protected]>
Add a simple cpio decoder without library dependencies for the purpose
of extracting components from the initramfs blob for early kernel
uses. Intended consumers so far are microcode and ACPI override.
Signed-off-by: H. Peter Anvin <[email protected]>
CC: Thomas Renninger <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Renninger <[email protected]>
I was trying to figure out if there is a way to do what you want
(support for multiple files) without the problems of the callback
interface. I think it is actually fairly straightforward; we need a
prefix iterator (so you can give it a string like "kernel/acpi/" rather
than a full filename) and it needs to be able to accept a "last" pointer
so it can resume scanning at the point it last left off. That should be
a pretty trivial change.
The other thing we presumably want to do -- and this is generic -- is to
be able to handle multiple sources for the initramfs; at the very least
there is built in vs provided from the boot loader. I had originally
intended to just handle that by calling the earlycpio function once per
block, but the "last left off" bit makes that a little harder. Need to
think about that a little bit.
I am guessing that this may not need to be something we need from the
very beginning, or am I wrong?
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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