| /* |
| * 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); |
| } |
| } |