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/*
* 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
*
* ??-Nov-2005 Mike Baker
* reorder the script as an lzma wrapper; do not depend on flash access
*/
#include "LzmaDecode.h"
#include <exports.h>
#define KSEG0ADDR(addr) (0x80000000|addr)
register volatile gd_t *gd asm ("k0");
unsigned char *data;
static __inline__ unsigned char get_byte()
{
unsigned char *buffer;
buffer = data;
data++;
return *buffer;
}
/* This puts lzma workspace 128k below RAM end.
* That should be enough for both lzma and stack
*/
static char *buffer = (char *)(RAMSTART + RAMSIZE - 0x00020000);
extern char _binary_vmlinux_lzma_start[];
extern char _binary_vmlinux_lzma_end[];
extern char lzma_start[];
extern char lzma_end[];
/* should be the first function */
void entry(unsigned int arg0, unsigned int arg1,
unsigned int arg2, unsigned int arg3)
{
unsigned int i; /* temp value */
unsigned int isize; /* compressed size */
unsigned int osize; /* uncompressed size */
int argc = arg0;
char **argv = (char **)arg1;
char **envp = (char **)arg2;
CLzmaDecoderState vs;
data = (unsigned char *)_binary_vmlinux_lzma_start;
isize = _binary_vmlinux_lzma_end - _binary_vmlinux_lzma_start + 1;
puts("\nLZMA kernel loader\n");
printf("lzma data @ %#x - %#x\n", _binary_vmlinux_lzma_start, _binary_vmlinux_lzma_end);
printf("load addr @ %#x\n\n", KERNEL_ENTRY);
printf("jump table @ %#x\n", gd->jt[3]);
/* lzma args */
i = get_byte();
vs.Properties.lc = i % 9, i = i / 9;
vs.Properties.lp = i % 5, vs.Properties.pb = i / 5;
vs.Probs = (CProb *)buffer;
/* skip rest of the LZMA coder property */
data += 4;
/* 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) */
data += 4;
/* decompress kernel */
puts("\nDecompressing kernel...");
if ((i = LzmaDecode(&vs,
(unsigned char*)data, isize, &isize,
(unsigned char*)KERNEL_ENTRY, osize, &osize)) == LZMA_RESULT_OK)
{
puts("success!\n");
/* Jump to load address */
// ((void (*)(int a0, int a1, int a2, int a3))KERNEL_ENTRY)(0,0,0,0);
((void (*)(int a0, int a1, int a2, int a3))KERNEL_ENTRY)(arg0, arg1, arg2, arg3);
}
puts("failure!\n");
}
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