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author | Lasse Collin <lasse.collin@tukaani.org> | 2011-01-12 17:01:23 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 08:03:25 -0800 |
commit | 3ebe12439ba7fc62e1d6ecb569b7287771716ca1 (patch) | |
tree | 65945a63ad1474489d80c8ca1fb1c1c8091fb7a2 /include/linux | |
parent | 24fa0402a9b6a537e87e38341e78b7da86486846 (diff) | |
download | op-kernel-dev-3ebe12439ba7fc62e1d6ecb569b7287771716ca1.zip op-kernel-dev-3ebe12439ba7fc62e1d6ecb569b7287771716ca1.tar.gz |
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 'include/linux')
-rw-r--r-- | include/linux/decompress/unxz.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/decompress/unxz.h b/include/linux/decompress/unxz.h new file mode 100644 index 0000000..41728fc --- /dev/null +++ b/include/linux/decompress/unxz.h @@ -0,0 +1,19 @@ +/* + * Wrapper for decompressing XZ-compressed kernel, initramfs, and initrd + * + * Author: Lasse Collin <lasse.collin@tukaani.org> + * + * This file has been put into the public domain. + * You can do whatever you want with this file. + */ + +#ifndef DECOMPRESS_UNXZ_H +#define DECOMPRESS_UNXZ_H + +int unxz(unsigned char *in, int in_size, + int (*fill)(void *dest, unsigned int size), + int (*flush)(void *src, unsigned int size), + unsigned char *out, int *in_used, + void (*error)(char *x)); + +#endif |