-/*
- * 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)();
- }
-}
projects / openwrt.git / blobdiff