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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"
#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;
}
}
unsigned char *data;
static int read_byte(void *object, unsigned char **buffer, UInt32 *bufferSize)
{
*bufferSize = 1;
*buffer = data;
++data;
return LZMA_RESULT_OK;
}
static __inline__ unsigned char get_byte(void)
{
unsigned char *buffer;
UInt32 fake;
return read_byte(0, &buffer, &fake), *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 lzma_start[];
extern char lzma_end[];
/* 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 osize; /* uncompressed size */
volatile unsigned int arg0, arg1, arg2, arg3;
/* restore argument registers */
__asm__ __volatile__ ("ori %0, $12, 0":"=r"(arg0));
__asm__ __volatile__ ("ori %0, $13, 0":"=r"(arg1));
__asm__ __volatile__ ("ori %0, $14, 0":"=r"(arg2));
__asm__ __volatile__ ("ori %0, $15, 0":"=r"(arg3));
ILzmaInCallback callback;
CLzmaDecoderState vs;
callback.Read = read_byte;
data = lzma_start;
/* 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 */
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 ((i = LzmaDecode(&vs, &callback,
(unsigned char*)KERNEL_ENTRY, osize, &osize)) == LZMA_RESULT_OK)
{
blast_dcache(dcache_size, dcache_lsize);
blast_icache(icache_size, icache_lsize);
/* Jump to load address */
((void (*)(int a0, int a1, int a2, int a3)) KERNEL_ENTRY)(arg0, arg1, arg2, arg3);
}
}
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