[PATCH 2/3] lib: Add support for LZ4-compressed kernel
Jean-Christophe PLAGNIOL-VILLARD
plagnioj at jcrosoft.com
Fri Jul 12 05:22:38 EDT 2013
From: Kyungsik Lee <kyungsik.lee at lge.com>
This patch adds support for extracting LZ4-compressed kernel images,
as well as LZ4-compressed ramdisk images in the kernel boot process.
This depends on the patch below
decompressor: Add LZ4 decompressor module
Signed-off-by: Kyungsik Lee <kyungsik.lee at lge.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
common/filetype.c | 4 +
include/filetype.h | 1 +
include/linux/decompress/unlz4.h | 10 +++
lib/Kconfig | 4 +
lib/Makefile | 2 +
lib/decompress_unlz4.c | 188 +++++++++++++++++++++++++++++++++++++++
lib/lz4/Makefile | 1 +
lib/lz4/lz4_decompress.c | 3 +-
lib/uncompress.c | 6 ++
scripts/Makefile.lib | 5 ++
10 files changed, 223 insertions(+), 1 deletion(-)
create mode 100644 include/linux/decompress/unlz4.h
create mode 100644 lib/decompress_unlz4.c
create mode 100644 lib/lz4/Makefile
diff --git a/common/filetype.c b/common/filetype.c
index 1ff3dd2..13c7994 100644
--- a/common/filetype.c
+++ b/common/filetype.c
@@ -33,6 +33,7 @@ static const struct filetype_str filetype_str[] = {
[filetype_unknown] = { "unknown", "unkown" },
[filetype_arm_zimage] = { "arm Linux zImage", "arm-zimage" },
[filetype_lzo_compressed] = { "lzo compressed", "lzo" },
+ [filetype_lz4_compressed] = { "lz4 compressed", "lz4" },
[filetype_arm_barebox] = { "arm barebox image", "arm-barebox" },
[filetype_uimage] = { "U-Boot uImage", "u-boot" },
[filetype_ubi] = { "UBI image", "ubi" },
@@ -195,6 +196,9 @@ enum filetype file_detect_type(const void *_buf, size_t bufsize)
if (buf8[0] == 0x89 && buf8[1] == 0x4c && buf8[2] == 0x5a &&
buf8[3] == 0x4f)
return filetype_lzo_compressed;
+ if (buf8[0] == 0x02 && buf8[1] == 0x21 && buf8[2] == 0x4c &&
+ buf8[3] == 0x18)
+ return filetype_lz4_compressed;
if (buf[0] == be32_to_cpu(0x27051956))
return filetype_uimage;
if (buf[0] == 0x23494255)
diff --git a/include/filetype.h b/include/filetype.h
index c73c64a..1b90805 100644
--- a/include/filetype.h
+++ b/include/filetype.h
@@ -10,6 +10,7 @@ enum filetype {
filetype_unknown,
filetype_arm_zimage,
filetype_lzo_compressed,
+ filetype_lz4_compressed,
filetype_arm_barebox,
filetype_uimage,
filetype_ubi,
diff --git a/include/linux/decompress/unlz4.h b/include/linux/decompress/unlz4.h
new file mode 100644
index 0000000..7aaafc2
--- /dev/null
+++ b/include/linux/decompress/unlz4.h
@@ -0,0 +1,10 @@
+#ifndef DECOMPRESS_UNLZ4_H
+#define DECOMPRESS_UNLZ4_H
+
+int decompress_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
diff --git a/lib/Kconfig b/lib/Kconfig
index 646fdb7..b5ac22a 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -14,6 +14,10 @@ config BZLIB
bool "include bzip2 uncompression support"
select UNCOMPRESS
+config LZ4_DECOMPRESS
+ bool "include lz4 uncompression support"
+ select UNCOMPRESS
+
config GENERIC_FIND_NEXT_BIT
def_bool n
diff --git a/lib/Makefile b/lib/Makefile
index 7c42537..61f1e63 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -28,8 +28,10 @@ obj-y += notifier.o
obj-y += copy_file.o
obj-y += random.o
obj-y += lzo/
+obj-$(CONFIG_LZ4_DECOMPRESS) += lz4/
obj-y += show_progress.o
obj-$(CONFIG_LZO_DECOMPRESS) += decompress_unlzo.o
+obj-$(CONFIG_LZ4_DECOMPRESS) += decompress_unlz4.o
obj-$(CONFIG_PROCESS_ESCAPE_SEQUENCE) += process_escape_sequence.o
obj-$(CONFIG_UNCOMPRESS) += uncompress.o
obj-$(CONFIG_BCH) += bch.o
diff --git a/lib/decompress_unlz4.c b/lib/decompress_unlz4.c
new file mode 100644
index 0000000..894cc37
--- /dev/null
+++ b/lib/decompress_unlz4.c
@@ -0,0 +1,188 @@
+/*
+ * Wrapper for decompressing LZ4-compressed kernel, initramfs, and initrd
+ *
+ * Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee at 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 <linux/decompress/mm.h>
+#include "lz4/lz4_decompress.c"
+#else
+#include <linux/decompress/unlz4.h>
+#include <malloc.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 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 = 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 = 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)
+ free(inp_start);
+exit_1:
+ if (!output)
+ free(outp);
+exit_0:
+ return ret;
+}
+
+int decompress_unlz4(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);
+}
+#define decompress decompress_unlz4
diff --git a/lib/lz4/Makefile b/lib/lz4/Makefile
new file mode 100644
index 0000000..7f548c6
--- /dev/null
+++ b/lib/lz4/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_LZ4_DECOMPRESS) += lz4_decompress.o
diff --git a/lib/lz4/lz4_decompress.c b/lib/lz4/lz4_decompress.c
index d3414ea..8e64ce6 100644
--- a/lib/lz4/lz4_decompress.c
+++ b/lib/lz4/lz4_decompress.c
@@ -38,10 +38,11 @@
*/
#ifndef STATIC
-#include <linux/module.h>
+#include <module.h>
#include <linux/kernel.h>
#endif
#include <linux/lz4.h>
+#include <linux/string.h>
#include <asm/unaligned.h>
diff --git a/lib/uncompress.c b/lib/uncompress.c
index e0a69df..a4225aa 100644
--- a/lib/uncompress.c
+++ b/lib/uncompress.c
@@ -21,6 +21,7 @@
#include <bunzip2.h>
#include <gunzip.h>
#include <lzo.h>
+#include <linux/decompress/unlz4.h>
#include <errno.h>
#include <filetype.h>
#include <malloc.h>
@@ -112,6 +113,11 @@ int uncompress(unsigned char *inbuf, int len,
compfn = decompress_unlzo;
break;
#endif
+#ifdef CONFIG_LZ4_DECOMPRESS
+ case filetype_lz4_compressed:
+ compfn = decompress_unlz4;
+ break;
+#endif
default:
err = asprintf("cannot handle filetype %s", file_type_to_string(ft));
error_fn(err);
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 307412f..722b410 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -289,6 +289,11 @@ cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
(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)
+
quiet_cmd_disasm = DISASM $@
cmd_disasm = $(OBJDUMP) -d $< > $@
--
1.8.3.2
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