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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 <firstname.lastname@example.org> Cc: "H. Peter Anvin" <email@example.com> Cc: Alain Knaff <firstname.lastname@example.org> Cc: Albin Tonnerre <email@example.com> Cc: Phillip Lougher <firstname.lastname@example.org> Signed-off-by: Andrew Morton <email@example.com> Signed-off-by: Linus Torvalds <firstname.lastname@example.org>
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Showing with 469 additions and 2 deletions.
|@@ -0,0 +1,19 @@|
|+ * Wrapper for decompressing XZ-compressed kernel, initramfs, and initrd|
|+ * Author: Lasse Collin <email@example.com>|
|+ * This file has been put into the public domain.|
|+ * You can do whatever you want with this file.|
|+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));|
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