mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-27 14:14:24 +08:00
lib: add support for LZ4-compressed kernel
Add support for extracting LZ4-compressed kernel images, as well as LZ4-compressed ramdisk images in the kernel boot process. Signed-off-by: Kyungsik Lee <kyungsik.lee@lge.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Borislav Petkov <bp@alien8.de> Cc: Florian Fainelli <florian@openwrt.org> Cc: Yann Collet <yann.collet.73@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kyungsik Lee
Linus Torvalds
parent
cffb78b0e0
commit
e76e1fdfa8
10
include/linux/decompress/unlz4.h
Normal file
10
include/linux/decompress/unlz4.h
Normal file
@ -0,0 +1,10 @@
|
||||
#ifndef DECOMPRESS_UNLZ4_H
|
||||
#define DECOMPRESS_UNLZ4_H
|
||||
|
||||
int unlz4(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
|
||||
17
init/Kconfig
17
init/Kconfig
@ -112,10 +112,13 @@ config HAVE_KERNEL_XZ
|
||||
config HAVE_KERNEL_LZO
|
||||
bool
|
||||
|
||||
config HAVE_KERNEL_LZ4
|
||||
bool
|
||||
|
||||
choice
|
||||
prompt "Kernel compression mode"
|
||||
default KERNEL_GZIP
|
||||
depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO
|
||||
depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4
|
||||
help
|
||||
The linux kernel is a kind of self-extracting executable.
|
||||
Several compression algorithms are available, which differ
|
||||
@ -182,6 +185,18 @@ config KERNEL_LZO
|
||||
size is about 10% bigger than gzip; however its speed
|
||||
(both compression and decompression) is the fastest.
|
||||
|
||||
config KERNEL_LZ4
|
||||
bool "LZ4"
|
||||
depends on HAVE_KERNEL_LZ4
|
||||
help
|
||||
LZ4 is an LZ77-type compressor with a fixed, byte-oriented encoding.
|
||||
A preliminary version of LZ4 de/compression tool is available at
|
||||
<https://code.google.com/p/lz4/>.
|
||||
|
||||
Its compression ratio is worse than LZO. The size of the kernel
|
||||
is about 8% bigger than LZO. But the decompression speed is
|
||||
faster than LZO.
|
||||
|
||||
endchoice
|
||||
|
||||
config DEFAULT_HOSTNAME
|
||||
|
||||
@ -194,6 +194,9 @@ config LZO_COMPRESS
|
||||
config LZO_DECOMPRESS
|
||||
tristate
|
||||
|
||||
config LZ4_DECOMPRESS
|
||||
tristate
|
||||
|
||||
source "lib/xz/Kconfig"
|
||||
|
||||
#
|
||||
@ -218,6 +221,10 @@ config DECOMPRESS_LZO
|
||||
select LZO_DECOMPRESS
|
||||
tristate
|
||||
|
||||
config DECOMPRESS_LZ4
|
||||
select LZ4_DECOMPRESS
|
||||
tristate
|
||||
|
||||
#
|
||||
# Generic allocator support is selected if needed
|
||||
#
|
||||
|
||||
@ -75,6 +75,7 @@ obj-$(CONFIG_REED_SOLOMON) += reed_solomon/
|
||||
obj-$(CONFIG_BCH) += bch.o
|
||||
obj-$(CONFIG_LZO_COMPRESS) += lzo/
|
||||
obj-$(CONFIG_LZO_DECOMPRESS) += lzo/
|
||||
obj-$(CONFIG_LZ4_DECOMPRESS) += lz4/
|
||||
obj-$(CONFIG_XZ_DEC) += xz/
|
||||
obj-$(CONFIG_RAID6_PQ) += raid6/
|
||||
|
||||
@ -83,6 +84,7 @@ lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
|
||||
lib-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
|
||||
lib-$(CONFIG_DECOMPRESS_XZ) += decompress_unxz.o
|
||||
lib-$(CONFIG_DECOMPRESS_LZO) += decompress_unlzo.o
|
||||
lib-$(CONFIG_DECOMPRESS_LZ4) += decompress_unlz4.o
|
||||
|
||||
obj-$(CONFIG_TEXTSEARCH) += textsearch.o
|
||||
obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o
|
||||
|
||||
@ -11,6 +11,7 @@
|
||||
#include <linux/decompress/unxz.h>
|
||||
#include <linux/decompress/inflate.h>
|
||||
#include <linux/decompress/unlzo.h>
|
||||
#include <linux/decompress/unlz4.h>
|
||||
|
||||
#include <linux/types.h>
|
||||
#include <linux/string.h>
|
||||
@ -31,6 +32,9 @@
|
||||
#ifndef CONFIG_DECOMPRESS_LZO
|
||||
# define unlzo NULL
|
||||
#endif
|
||||
#ifndef CONFIG_DECOMPRESS_LZ4
|
||||
# define unlz4 NULL
|
||||
#endif
|
||||
|
||||
struct compress_format {
|
||||
unsigned char magic[2];
|
||||
@ -45,6 +49,7 @@ static const struct compress_format compressed_formats[] __initconst = {
|
||||
{ {0x5d, 0x00}, "lzma", unlzma },
|
||||
{ {0xfd, 0x37}, "xz", unxz },
|
||||
{ {0x89, 0x4c}, "lzo", unlzo },
|
||||
{ {0x02, 0x21}, "lz4", unlz4 },
|
||||
{ {0, 0}, NULL, NULL }
|
||||
};
|
||||
|
||||
|
||||
187
lib/decompress_unlz4.c
Normal file
187
lib/decompress_unlz4.c
Normal file
@ -0,0 +1,187 @@
|
||||
/*
|
||||
* Wrapper for decompressing LZ4-compressed kernel, initramfs, and initrd
|
||||
*
|
||||
* Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifdef STATIC
|
||||
#define PREBOOT
|
||||
#include "lz4/lz4_decompress.c"
|
||||
#else
|
||||
#include <linux/decompress/unlz4.h>
|
||||
#endif
|
||||
#include <linux/types.h>
|
||||
#include <linux/lz4.h>
|
||||
#include <linux/decompress/mm.h>
|
||||
#include <linux/compiler.h>
|
||||
|
||||
#include <asm/unaligned.h>
|
||||
|
||||
/*
|
||||
* Note: Uncompressed chunk size is used in the compressor side
|
||||
* (userspace side for compression).
|
||||
* It is hardcoded because there is not proper way to extract it
|
||||
* from the binary stream which is generated by the preliminary
|
||||
* version of LZ4 tool so far.
|
||||
*/
|
||||
#define LZ4_DEFAULT_UNCOMPRESSED_CHUNK_SIZE (8 << 20)
|
||||
#define ARCHIVE_MAGICNUMBER 0x184C2102
|
||||
|
||||
STATIC inline int INIT unlz4(u8 *input, int in_len,
|
||||
int (*fill) (void *, unsigned int),
|
||||
int (*flush) (void *, unsigned int),
|
||||
u8 *output, int *posp,
|
||||
void (*error) (char *x))
|
||||
{
|
||||
int ret = -1;
|
||||
size_t chunksize = 0;
|
||||
size_t uncomp_chunksize = LZ4_DEFAULT_UNCOMPRESSED_CHUNK_SIZE;
|
||||
u8 *inp;
|
||||
u8 *inp_start;
|
||||
u8 *outp;
|
||||
int size = in_len;
|
||||
#ifdef PREBOOT
|
||||
size_t out_len = get_unaligned_le32(input + in_len);
|
||||
#endif
|
||||
size_t dest_len;
|
||||
|
||||
|
||||
if (output) {
|
||||
outp = output;
|
||||
} else if (!flush) {
|
||||
error("NULL output pointer and no flush function provided");
|
||||
goto exit_0;
|
||||
} else {
|
||||
outp = large_malloc(uncomp_chunksize);
|
||||
if (!outp) {
|
||||
error("Could not allocate output buffer");
|
||||
goto exit_0;
|
||||
}
|
||||
}
|
||||
|
||||
if (input && fill) {
|
||||
error("Both input pointer and fill function provided,");
|
||||
goto exit_1;
|
||||
} else if (input) {
|
||||
inp = input;
|
||||
} else if (!fill) {
|
||||
error("NULL input pointer and missing fill function");
|
||||
goto exit_1;
|
||||
} else {
|
||||
inp = large_malloc(lz4_compressbound(uncomp_chunksize));
|
||||
if (!inp) {
|
||||
error("Could not allocate input buffer");
|
||||
goto exit_1;
|
||||
}
|
||||
}
|
||||
inp_start = inp;
|
||||
|
||||
if (posp)
|
||||
*posp = 0;
|
||||
|
||||
if (fill)
|
||||
fill(inp, 4);
|
||||
|
||||
chunksize = get_unaligned_le32(inp);
|
||||
if (chunksize == ARCHIVE_MAGICNUMBER) {
|
||||
inp += 4;
|
||||
size -= 4;
|
||||
} else {
|
||||
error("invalid header");
|
||||
goto exit_2;
|
||||
}
|
||||
|
||||
if (posp)
|
||||
*posp += 4;
|
||||
|
||||
for (;;) {
|
||||
|
||||
if (fill)
|
||||
fill(inp, 4);
|
||||
|
||||
chunksize = get_unaligned_le32(inp);
|
||||
if (chunksize == ARCHIVE_MAGICNUMBER) {
|
||||
inp += 4;
|
||||
size -= 4;
|
||||
if (posp)
|
||||
*posp += 4;
|
||||
continue;
|
||||
}
|
||||
inp += 4;
|
||||
size -= 4;
|
||||
|
||||
if (posp)
|
||||
*posp += 4;
|
||||
|
||||
if (fill) {
|
||||
if (chunksize > lz4_compressbound(uncomp_chunksize)) {
|
||||
error("chunk length is longer than allocated");
|
||||
goto exit_2;
|
||||
}
|
||||
fill(inp, chunksize);
|
||||
}
|
||||
#ifdef PREBOOT
|
||||
if (out_len >= uncomp_chunksize) {
|
||||
dest_len = uncomp_chunksize;
|
||||
out_len -= dest_len;
|
||||
} else
|
||||
dest_len = out_len;
|
||||
ret = lz4_decompress(inp, &chunksize, outp, dest_len);
|
||||
#else
|
||||
dest_len = uncomp_chunksize;
|
||||
ret = lz4_decompress_unknownoutputsize(inp, chunksize, outp,
|
||||
&dest_len);
|
||||
#endif
|
||||
if (ret < 0) {
|
||||
error("Decoding failed");
|
||||
goto exit_2;
|
||||
}
|
||||
|
||||
if (flush && flush(outp, dest_len) != dest_len)
|
||||
goto exit_2;
|
||||
if (output)
|
||||
outp += dest_len;
|
||||
if (posp)
|
||||
*posp += chunksize;
|
||||
|
||||
size -= chunksize;
|
||||
|
||||
if (size == 0)
|
||||
break;
|
||||
else if (size < 0) {
|
||||
error("data corrupted");
|
||||
goto exit_2;
|
||||
}
|
||||
|
||||
inp += chunksize;
|
||||
if (fill)
|
||||
inp = inp_start;
|
||||
}
|
||||
|
||||
ret = 0;
|
||||
exit_2:
|
||||
if (!input)
|
||||
large_free(inp_start);
|
||||
exit_1:
|
||||
if (!output)
|
||||
large_free(outp);
|
||||
exit_0:
|
||||
return ret;
|
||||
}
|
||||
|
||||
#ifdef PREBOOT
|
||||
STATIC int INIT decompress(unsigned char *buf, int in_len,
|
||||
int(*fill)(void*, unsigned int),
|
||||
int(*flush)(void*, unsigned int),
|
||||
unsigned char *output,
|
||||
int *posp,
|
||||
void(*error)(char *x)
|
||||
)
|
||||
{
|
||||
return unlz4(buf, in_len - 4, fill, flush, output, posp, error);
|
||||
}
|
||||
#endif
|
||||
1
lib/lz4/Makefile
Normal file
1
lib/lz4/Makefile
Normal file
@ -0,0 +1 @@
|
||||
obj-$(CONFIG_LZ4_DECOMPRESS) += lz4_decompress.o
|
||||
@ -1,7 +1,7 @@
|
||||
/*
|
||||
* LZ4 Decompressor for Linux kernel
|
||||
*
|
||||
* Copyright (C) 2013 LG Electronics Co., Ltd. (http://www.lge.com/)
|
||||
* Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com>
|
||||
*
|
||||
* Based on LZ4 implementation by Yann Collet.
|
||||
*
|
||||
|
||||
@ -311,6 +311,11 @@ cmd_lzo = (cat $(filter-out FORCE,$^) | \
|
||||
lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
|
||||
(rm -f $@ ; false)
|
||||
|
||||
quiet_cmd_lz4 = LZ4 $@
|
||||
cmd_lz4 = (cat $(filter-out FORCE,$^) | \
|
||||
lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
|
||||
(rm -f $@ ; false)
|
||||
|
||||
# U-Boot mkimage
|
||||
# ---------------------------------------------------------------------------
|
||||
|
||||
|
||||
@ -90,6 +90,15 @@ config RD_LZO
|
||||
Support loading of a LZO encoded initial ramdisk or cpio buffer
|
||||
If unsure, say N.
|
||||
|
||||
config RD_LZ4
|
||||
bool "Support initial ramdisks compressed using LZ4" if EXPERT
|
||||
default !EXPERT
|
||||
depends on BLK_DEV_INITRD
|
||||
select DECOMPRESS_LZ4
|
||||
help
|
||||
Support loading of a LZ4 encoded initial ramdisk or cpio buffer
|
||||
If unsure, say N.
|
||||
|
||||
choice
|
||||
prompt "Built-in initramfs compression mode" if INITRAMFS_SOURCE!=""
|
||||
help
|
||||
|
||||
Loading…
Reference in New Issue
Block a user