Hi Albin, Just tested it with the Compressed kernel support of MIPS in Ralf's linux-queue git repository and with an extra patch for this LZO support of MIPS on a YeeLoong2F netbook: http://www.linux-mips.org/archives/linux-mips/2009-10/msg00143.html It works well. Thanks & Regards, Wu Zhangjin On Wed, 2009-11-11 at 13:27 +0100, Albin Tonnerre wrote: > This is the first part of the lzo patch > The lzo compressor is worse than gzip at compression, but faster at > extraction. Here are some figures for an ARM board I'm working on: > > Uncompressed size: 3.24Mo > gzip 1.61Mo 0.72s > lzo 1.75Mo 0.48s > > So for a compression ratio that is still relatively close to gzip, it's > much faster to extract, at least in that case. > > This version applies to kernel 2.6.31-rc3 > > This part contains: > - Makefile routine to support lzo compression > - Fixes to the existing lzo compressor so that it can be used in > compressed kernels > - wrapper around the existing lzo1x_decompress, as it only extracts one > block at a time, while we need to extract a whole file here > - config dialog for kernel compression > > Signed-off-by: Albin Tonnerre <albin.tonnerre@xxxxxxxxxxxxxxxxxx> > --- > include/linux/decompress/unlzo.h | 10 ++ > init/Kconfig | 18 +++- > lib/decompress_unlzo.c | 208 ++++++++++++++++++++++++++++++++++++++ > lib/lzo/lzo1x_decompress.c | 9 +- > scripts/Makefile.lib | 5 + > 5 files changed, 243 insertions(+), 7 deletions(-) > create mode 100644 include/linux/decompress/unlzo.h > create mode 100644 lib/decompress_unlzo.c > > 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@xxxxxxxxxxxxxxxxxx> > + * > + * 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@xxxxxxxxxxxxx> > + * 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@xxxxxxxxxxxxxx> > */ > > +#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)
