From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/lib/decompress_unlz4.c | 209 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 209 insertions(+) create mode 100644 kernel/lib/decompress_unlz4.c (limited to 'kernel/lib/decompress_unlz4.c') diff --git a/kernel/lib/decompress_unlz4.c b/kernel/lib/decompress_unlz4.c new file mode 100644 index 000000000..40f66ebe5 --- /dev/null +++ b/kernel/lib/decompress_unlz4.c @@ -0,0 +1,209 @@ +/* + * Wrapper for decompressing LZ4-compressed kernel, initramfs, and initrd + * + * Copyright (C) 2013, LG Electronics, Kyungsik Lee + * + * 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 +#endif +#include +#include +#include +#include + +#include + +/* + * 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, long in_len, + long (*fill)(void *, unsigned long), + long (*flush)(void *, unsigned long), + u8 *output, long *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; + long 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) { + size = fill(inp, 4); + if (size < 4) { + error("data corrupted"); + goto exit_2; + } + } + + chunksize = get_unaligned_le32(inp); + if (chunksize == ARCHIVE_MAGICNUMBER) { + if (!fill) { + inp += 4; + size -= 4; + } + } else { + error("invalid header"); + goto exit_2; + } + + if (posp) + *posp += 4; + + for (;;) { + + if (fill) { + size = fill(inp, 4); + if (size == 0) + break; + if (size < 4) { + error("data corrupted"); + goto exit_2; + } + } + + chunksize = get_unaligned_le32(inp); + if (chunksize == ARCHIVE_MAGICNUMBER) { + if (!fill) { + inp += 4; + size -= 4; + } + if (posp) + *posp += 4; + continue; + } + + + if (posp) + *posp += 4; + + if (!fill) { + inp += 4; + size -= 4; + } else { + if (chunksize > lz4_compressbound(uncomp_chunksize)) { + error("chunk length is longer than allocated"); + goto exit_2; + } + size = fill(inp, chunksize); + if (size < chunksize) { + error("data corrupted"); + goto exit_2; + } + } +#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; + } + + ret = -1; + if (flush && flush(outp, dest_len) != dest_len) + goto exit_2; + if (output) + outp += dest_len; + if (posp) + *posp += chunksize; + + if (!fill) { + size -= chunksize; + + if (size == 0) + break; + else if (size < 0) { + error("data corrupted"); + goto exit_2; + } + inp += chunksize; + } + } + + 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, long in_len, + long (*fill)(void*, unsigned long), + long (*flush)(void*, unsigned long), + unsigned char *output, + long *posp, + void(*error)(char *x) + ) +{ + return unlz4(buf, in_len - 4, fill, flush, output, posp, error); +} +#endif -- cgit 1.2.3-korg