175 lines
4.8 KiB
C
175 lines
4.8 KiB
C
/*
|
|
* 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)();
|
|
}
|
|
}
|