1. 09 Jul, 2013 1 commit
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  4. 13 Jan, 2011 1 commit
    • Lasse Collin's avatar
      decompressors: add boot-time XZ support · 3ebe1243
      Lasse Collin authored
      This implements the API defined in <linux/decompress/generic.h> 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: 's avatarLasse Collin <lasse.collin@tukaani.org>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Alain Knaff <alain@knaff.lu>
      Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com>
      Cc: Phillip Lougher <phillip@lougher.demon.co.uk>
      Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
      3ebe1243
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