diff options
Diffstat (limited to 'target/image/brcm/lzma-loader/src/decompress.c')
| -rw-r--r-- | target/image/brcm/lzma-loader/src/decompress.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/target/image/brcm/lzma-loader/src/decompress.c b/target/image/brcm/lzma-loader/src/decompress.c new file mode 100644 index 0000000000..ec510e21e3 --- /dev/null +++ b/target/image/brcm/lzma-loader/src/decompress.c @@ -0,0 +1,175 @@ +/* + * LZMA compressed kernel decompressor for bcm947xx boards + * + * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su> + * + * This program is free software; you can redistribute it and/or modify + * it 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; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * + * Please note, this was code based on the bunzip2 decompressor code + * by Manuel Novoa III (mjn3@codepoet.org), although the only thing left + * is an idea and part of original vendor code + * + * + * 12-Mar-2005 Mineharu Takahara <mtakahar@yahoo.com> + * pass actual output size to decoder (stream mode + * compressed input is not a requirement anymore) + * + * 24-Apr-2005 Oleg I. Vdovikin + * reordered functions using lds script, removed forward decl + * + */ + +#include "LzmaDecode.h" + +#define BCM4710_FLASH 0x1fc00000 /* Flash */ + +#define KSEG0 0x80000000 +#define KSEG1 0xa0000000 + +#define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1) + +#define Index_Invalidate_I 0x00 +#define Index_Writeback_Inv_D 0x01 + +#define cache_unroll(base,op) \ + __asm__ __volatile__( \ + ".set noreorder;\n" \ + ".set mips3;\n" \ + "cache %1, (%0);\n" \ + ".set mips0;\n" \ + ".set reorder\n" \ + : \ + : "r" (base), \ + "i" (op)); + +static __inline__ void blast_icache(unsigned long size, unsigned long lsize) +{ + unsigned long start = KSEG0; + unsigned long end = (start + size); + + while(start < end) { + cache_unroll(start,Index_Invalidate_I); + start += lsize; + } +} + +static __inline__ void blast_dcache(unsigned long size, unsigned long lsize) +{ + unsigned long start = KSEG0; + unsigned long end = (start + size); + + while(start < end) { + cache_unroll(start,Index_Writeback_Inv_D); + start += lsize; + } +} + +#define TRX_MAGIC 0x30524448 /* "HDR0" */ + +struct trx_header { + unsigned int magic; /* "HDR0" */ + unsigned int len; /* Length of file including header */ + unsigned int crc32; /* 32-bit CRC from flag_version to end of file */ + unsigned int flag_version; /* 0:15 flags, 16:31 version */ + unsigned int offsets[3]; /* Offsets of partitions from start of header */ +}; + +/* beyound the image end, size not known in advance */ +extern unsigned char workspace[]; + +unsigned int offset; +unsigned char *data; + +/* flash access should be aligned, so wrapper is used */ +/* read byte from the flash, all accesses are 32-bit aligned */ +static int read_byte(void *object, unsigned char **buffer, UInt32 *bufferSize) +{ + static unsigned int val; + + if (((unsigned int)offset % 4) == 0) { + val = *(unsigned int *)data; + data += 4; + } + + *bufferSize = 1; + *buffer = ((unsigned char *)&val) + (offset++ & 3); + + return LZMA_RESULT_OK; +} + +static __inline__ unsigned char get_byte(void) +{ + unsigned char *buffer; + UInt32 fake; + + return read_byte(0, &buffer, &fake), *buffer; +} + +/* should be the first function */ +void entry(unsigned long icache_size, unsigned long icache_lsize, + unsigned long dcache_size, unsigned long dcache_lsize) +{ + unsigned int i; /* temp value */ + unsigned int lc; /* literal context bits */ + unsigned int lp; /* literal pos state bits */ + unsigned int pb; /* pos state bits */ + unsigned int osize; /* uncompressed size */ + + ILzmaInCallback callback; + callback.Read = read_byte; + + /* look for trx header, 32-bit data access */ + for (data = ((unsigned char *) KSEG1ADDR(BCM4710_FLASH)); + ((struct trx_header *)data)->magic != TRX_MAGIC; data += 65536); + + /* compressed kernel is in the partition 0 or 1 */ + if (((struct trx_header *)data)->offsets[1] > 65536) + data += ((struct trx_header *)data)->offsets[0]; + else + data += ((struct trx_header *)data)->offsets[1]; + + offset = 0; + + /* lzma args */ + i = get_byte(); + lc = i % 9, i = i / 9; + lp = i % 5, pb = i / 5; + + /* skip rest of the LZMA coder property */ + for (i = 0; i < 4; i++) + get_byte(); + + /* read the lower half of uncompressed size in the header */ + osize = ((unsigned int)get_byte()) + + ((unsigned int)get_byte() << 8) + + ((unsigned int)get_byte() << 16) + + ((unsigned int)get_byte() << 24); + + /* skip rest of the header (upper half of uncompressed size) */ + for (i = 0; i < 4; i++) + get_byte(); + + /* decompress kernel */ + if (LzmaDecode(workspace, ~0, lc, lp, pb, &callback, + (unsigned char*)LOADADDR, osize, &i) == LZMA_RESULT_OK) + { + blast_dcache(dcache_size, dcache_lsize); + blast_icache(icache_size, icache_lsize); + + /* Jump to load address */ + ((void (*)(void)) LOADADDR)(); + } +} |