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<title>pm24.git/include/linux/decompress/unxz.h, branch v3.10</title>
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<updated>2011-01-13T16:03:25Z</updated>
<entry>
<title>decompressors: add boot-time XZ support</title>
<updated>2011-01-13T16:03:25Z</updated>
<author>
<name>Lasse Collin</name>
<email>lasse.collin@tukaani.org</email>
</author>
<published>2011-01-13T01:01:23Z</published>
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This implements the API defined in &lt;linux/decompress/generic.h&gt; which is
used for kernel, initramfs, and initrd decompression.  This patch together
with the first patch is enough for XZ-compressed initramfs and initrd;
XZ-compressed kernel will need arch-specific changes.

The buffering requirements described in decompress_unxz.c are stricter
than with gzip, so the relevant changes should be done to the
arch-specific code when adding support for XZ-compressed kernel.
Similarly, the heap size in arch-specific pre-boot code may need to be
increased (30 KiB is enough).

The XZ decompressor needs memmove(), memeq() (memcmp() == 0), and
memzero() (memset(ptr, 0, size)), which aren't available in all
arch-specific pre-boot environments.  I'm including simple versions in
decompress_unxz.c, but a cleaner solution would naturally be nicer.

Signed-off-by: Lasse Collin &lt;lasse.collin@tukaani.org&gt;
Cc: "H. Peter Anvin" &lt;hpa@zytor.com&gt;
Cc: Alain Knaff &lt;alain@knaff.lu&gt;
Cc: Albin Tonnerre &lt;albin.tonnerre@free-electrons.com&gt;
Cc: Phillip Lougher &lt;phillip@lougher.demon.co.uk&gt;
Signed-off-by: Andrew Morton &lt;akpm@linux-foundation.org&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
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