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| author | Lasse Collin <lasse.collin@tukaani.org> | 2011-01-12 17:01:23 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 08:03:25 -0800 |
| commit | 3ebe12439ba7fc62e1d6ecb569b7287771716ca1 (patch) | |
| tree | 65945a63ad1474489d80c8ca1fb1c1c8091fb7a2 /lib/decompress.c | |
| parent | 24fa0402a9b6a537e87e38341e78b7da86486846 (diff) | |
| download | lwn-3ebe12439ba7fc62e1d6ecb569b7287771716ca1.tar.gz lwn-3ebe12439ba7fc62e1d6ecb569b7287771716ca1.zip | |
decompressors: add boot-time XZ support
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: Lasse 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/decompress.c')
| -rw-r--r-- | lib/decompress.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/decompress.c b/lib/decompress.c index a7606815541f..3d766b7f60ab 100644 --- a/lib/decompress.c +++ b/lib/decompress.c @@ -8,6 +8,7 @@ #include <linux/decompress/bunzip2.h> #include <linux/decompress/unlzma.h> +#include <linux/decompress/unxz.h> #include <linux/decompress/inflate.h> #include <linux/decompress/unlzo.h> @@ -23,6 +24,9 @@ #ifndef CONFIG_DECOMPRESS_LZMA # define unlzma NULL #endif +#ifndef CONFIG_DECOMPRESS_XZ +# define unxz NULL +#endif #ifndef CONFIG_DECOMPRESS_LZO # define unlzo NULL #endif @@ -36,6 +40,7 @@ static const struct compress_format { { {037, 0236}, "gzip", gunzip }, { {0x42, 0x5a}, "bzip2", bunzip2 }, { {0x5d, 0x00}, "lzma", unlzma }, + { {0xfd, 0x37}, "xz", unxz }, { {0x89, 0x4c}, "lzo", unlzo }, { {0, 0}, NULL, NULL } }; |