diff options
Diffstat (limited to 'target/linux/generic-2.6/patches-2.6.31/050-lzo_compressed_kernels.patch')
| -rw-r--r-- | target/linux/generic-2.6/patches-2.6.31/050-lzo_compressed_kernels.patch | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.31/050-lzo_compressed_kernels.patch b/target/linux/generic-2.6/patches-2.6.31/050-lzo_compressed_kernels.patch new file mode 100644 index 0000000000..fad1b87466 --- /dev/null +++ b/target/linux/generic-2.6/patches-2.6.31/050-lzo_compressed_kernels.patch @@ -0,0 +1,321 @@ +diff --git a/include/linux/decompress/unlzo.h b/include/linux/decompress/unlzo.h +new file mode 100644 +index 0000000..9872297 +--- /dev/null ++++ b/include/linux/decompress/unlzo.h +@@ -0,0 +1,10 @@ ++#ifndef DECOMPRESS_UNLZO_H ++#define DECOMPRESS_UNLZO_H ++ ++int unlzo(unsigned char *inbuf, int len, ++ int(*fill)(void*, unsigned int), ++ int(*flush)(void*, unsigned int), ++ unsigned char *output, ++ int *pos, ++ void(*error)(char *x)); ++#endif +diff --git a/init/Kconfig b/init/Kconfig +index f515864..eb65318 100644 +--- a/init/Kconfig ++++ b/init/Kconfig +@@ -115,10 +115,13 @@ config HAVE_KERNEL_BZIP2 + config HAVE_KERNEL_LZMA + bool + ++config HAVE_KERNEL_LZO ++ bool ++ + choice + prompt "Kernel compression mode" + default KERNEL_GZIP +- depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA ++ depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_LZO + help + The linux kernel is a kind of self-extracting executable. + Several compression algorithms are available, which differ +@@ -141,9 +144,8 @@ config KERNEL_GZIP + bool "Gzip" + depends on HAVE_KERNEL_GZIP + help +- The old and tried gzip compression. Its compression ratio is +- the poorest among the 3 choices; however its speed (both +- compression and decompression) is the fastest. ++ The old and tried gzip compression. It provides a good balance ++ between compression ratio and decompression speed. + + config KERNEL_BZIP2 + bool "Bzip2" +@@ -164,6 +166,14 @@ config KERNEL_LZMA + two. Compression is slowest. The kernel size is about 33% + smaller with LZMA in comparison to gzip. + ++config KERNEL_LZO ++ bool "LZO" ++ depends on HAVE_KERNEL_LZO ++ help ++ Its compression ratio is the poorest among the 4. The kernel ++ size is about about 10% bigger than gzip; however its speed ++ (both compression and decompression) is the fastest. ++ + endchoice + + config SWAP +diff --git a/lib/decompress_unlzo.c b/lib/decompress_unlzo.c +new file mode 100644 +index 0000000..2bb736f +--- /dev/null ++++ b/lib/decompress_unlzo.c +@@ -0,0 +1,208 @@ ++/* ++ * LZO decompressor for the Linux kernel. Code borrowed from the lzo ++ * implementation by Markus Franz Xaver Johannes Oberhumer. ++ * ++ * Linux kernel adaptation: ++ * Copyright (C) 2009 ++ * Albin Tonnerre, Free Electrons <albin.tonnerre@free-electrons.com> ++ * ++ * Original code: ++ * Copyright (C) 1996-2005 Markus Franz Xaver Johannes Oberhumer ++ * All Rights Reserved. ++ * ++ * lzop and the LZO library are free software; you can redistribute them ++ * and/or modify them under the terms of the GNU General Public License as ++ * published by the Free Software Foundation; either version 2 of ++ * the License, or (at your option) any later version. ++ * ++ * This program is distributed in the hope that it will be useful, ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ++ * GNU General Public License for more details. ++ * ++ * You should have received a copy of the GNU General Public License ++ * along with this program; see the file COPYING. ++ * If not, write to the Free Software Foundation, Inc., ++ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ++ * ++ * Markus F.X.J. Oberhumer ++ * <markus@oberhumer.com> ++ * http://www.oberhumer.com/opensource/lzop/ ++ */ ++ ++#ifdef STATIC ++#include "lzo/lzo1x_decompress.c" ++#else ++#include <linux/slab.h> ++#include <linux/decompress/unlzo.h> ++#endif ++ ++#include <linux/types.h> ++#include <linux/lzo.h> ++#include <linux/decompress/mm.h> ++ ++#include <linux/compiler.h> ++#include <asm/unaligned.h> ++ ++static const unsigned char lzop_magic[] = ++ { 0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a }; ++ ++#define LZO_BLOCK_SIZE (256*1024l) ++#define HEADER_HAS_FILTER 0x00000800L ++ ++STATIC inline int INIT parse_header(u8 *input, u8 *skip) ++{ ++ int l; ++ u8 *parse = input; ++ u8 level = 0; ++ u16 version; ++ ++ /* read magic: 9 first bits */ ++ for (l = 0; l < 9; l++) { ++ if (*parse++ != lzop_magic[l]) ++ return 0; ++ } ++ /* get version (2bytes), skip library version (2), ++ * 'need to be extracted' version (2) and ++ * method (1) */ ++ version = get_unaligned_be16(parse); ++ parse += 7; ++ if (version >= 0x0940) ++ level = *parse++; ++ if (get_unaligned_be32(parse) & HEADER_HAS_FILTER) ++ parse += 8; /* flags + filter info */ ++ else ++ parse += 4; /* flags */ ++ ++ /* skip mode and mtime_low */ ++ parse += 8; ++ if (version >= 0x0940) ++ parse += 4; /* skip mtime_high */ ++ ++ l = *parse++; ++ /* don't care about the file name, and skip checksum */ ++ parse += l + 4; ++ ++ *skip = parse - input; ++ return 1; ++} ++ ++STATIC inline int INIT unlzo(u8 *input, int in_len, ++ int (*fill) (void *, unsigned int), ++ int (*flush) (void *, unsigned int), ++ u8 *output, int *posp, ++ void (*error_fn) (char *x)) ++{ ++ u8 skip = 0, r = 0; ++ u32 src_len, dst_len; ++ size_t tmp; ++ u8 *in_buf, *in_buf_save, *out_buf; ++ int obytes_processed = 0; ++ ++ set_error_fn(error_fn); ++ ++ if (output) ++ out_buf = output; ++ else if (!flush) { ++ error("NULL output pointer and no flush function provided"); ++ goto exit; ++ } else { ++ out_buf = malloc(LZO_BLOCK_SIZE); ++ if (!out_buf) { ++ error("Could not allocate output buffer"); ++ goto exit; ++ } ++ } ++ ++ if (input && fill) { ++ error("Both input pointer and fill function provided, don't know what to do"); ++ goto exit_1; ++ } else if (input) ++ in_buf = input; ++ else if (!fill || !posp) { ++ error("NULL input pointer and missing position pointer or fill function"); ++ goto exit_1; ++ } else { ++ in_buf = malloc(lzo1x_worst_compress(LZO_BLOCK_SIZE)); ++ if (!in_buf) { ++ error("Could not allocate input buffer"); ++ goto exit_1; ++ } ++ } ++ in_buf_save = in_buf; ++ ++ if (posp) ++ *posp = 0; ++ ++ if (fill) ++ fill(in_buf, lzo1x_worst_compress(LZO_BLOCK_SIZE)); ++ ++ if (!parse_header(input, &skip)) { ++ error("invalid header"); ++ goto exit_2; ++ } ++ in_buf += skip; ++ ++ if (posp) ++ *posp = skip; ++ ++ for (;;) { ++ /* read uncompressed block size */ ++ dst_len = get_unaligned_be32(in_buf); ++ in_buf += 4; ++ ++ /* exit if last block */ ++ if (dst_len == 0) { ++ if (posp) ++ *posp += 4; ++ break; ++ } ++ ++ if (dst_len > LZO_BLOCK_SIZE) { ++ error("dest len longer than block size"); ++ goto exit_2; ++ } ++ ++ /* read compressed block size, and skip block checksum info */ ++ src_len = get_unaligned_be32(in_buf); ++ in_buf += 8; ++ ++ if (src_len <= 0 || src_len > dst_len) { ++ error("file corrupted"); ++ goto exit_2; ++ } ++ ++ /* decompress */ ++ tmp = dst_len; ++ r = lzo1x_decompress_safe((u8 *) in_buf, src_len, out_buf, &tmp); ++ ++ if (r != LZO_E_OK || dst_len != tmp) { ++ error("Compressed data violation"); ++ goto exit_2; ++ } ++ ++ obytes_processed += dst_len; ++ if (flush) ++ flush(out_buf, dst_len); ++ if (output) ++ out_buf += dst_len; ++ if (posp) ++ *posp += src_len + 12; ++ if (fill) { ++ in_buf = in_buf_save; ++ fill(in_buf, lzo1x_worst_compress(LZO_BLOCK_SIZE)); ++ } else ++ in_buf += src_len; ++ } ++ ++exit_2: ++ if (!input) ++ free(in_buf); ++exit_1: ++ if (!output) ++ free(out_buf); ++exit: ++ return obytes_processed; ++} ++ ++#define decompress unlzo +diff --git a/lib/lzo/lzo1x_decompress.c b/lib/lzo/lzo1x_decompress.c +index 5dc6b29..f2fd098 100644 +--- a/lib/lzo/lzo1x_decompress.c ++++ b/lib/lzo/lzo1x_decompress.c +@@ -11,11 +11,13 @@ + * Richard Purdie <rpurdie@openedhand.com> + */ + ++#ifndef STATIC + #include <linux/module.h> + #include <linux/kernel.h> +-#include <linux/lzo.h> +-#include <asm/byteorder.h> ++#endif ++ + #include <asm/unaligned.h> ++#include <linux/lzo.h> + #include "lzodefs.h" + + #define HAVE_IP(x, ip_end, ip) ((size_t)(ip_end - ip) < (x)) +@@ -244,9 +246,10 @@ lookbehind_overrun: + *out_len = op - out; + return LZO_E_LOOKBEHIND_OVERRUN; + } +- ++#ifndef STATIC + EXPORT_SYMBOL_GPL(lzo1x_decompress_safe); + + MODULE_LICENSE("GPL"); + MODULE_DESCRIPTION("LZO1X Decompressor"); + ++#endif +diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib +index ffdafb2..39c3483 100644 +--- a/scripts/Makefile.lib ++++ b/scripts/Makefile.lib +@@ -230,3 +230,8 @@ quiet_cmd_lzma = LZMA $@ + cmd_lzma = (cat $(filter-out FORCE,$^) | \ + lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ + (rm -f $@ ; false) ++ ++quiet_cmd_lzo = LZO $@ ++cmd_lzo = (cat $(filter-out FORCE,$^) | \ ++ lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ ++ (rm -f $@ ; false) |