1/* 2 * LZMA compressed kernel decompressor for bcm947xx boards 3 * 4 * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 * 21 * Please note, this was code based on the bunzip2 decompressor code 22 * by Manuel Novoa III (mjn3@codepoet.org), although the only thing left 23 * is an idea and part of original vendor code 24 * 25 * 26 * 12-Mar-2005 Mineharu Takahara <mtakahar@yahoo.com> 27 * pass actual output size to decoder (stream mode 28 * compressed input is not a requirement anymore) 29 * 30 * 24-Apr-2005 Oleg I. Vdovikin 31 * reordered functions using lds script, removed forward decl 32 * 33 */ 34 35#include "LzmaDecode.h" 36 37#define BCM4710_FLASH 0x1fc00000 /* Flash */ 38 39#define KSEG0 0x80000000 40#define KSEG1 0xa0000000 41 42#define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1) 43 44#define Index_Invalidate_I 0x00 45#define Index_Writeback_Inv_D 0x01 46 47#define cache_unroll(base,op) \ 48 __asm__ __volatile__( \ 49 ".set noreorder;\n" \ 50 ".set mips3;\n" \ 51 "cache %1, (%0);\n" \ 52 ".set mips0;\n" \ 53 ".set reorder\n" \ 54 : \ 55 : "r" (base), \ 56 "i" (op)); 57 58static __inline__ void blast_icache(unsigned long size, unsigned long lsize) 59{ 60 unsigned long start = KSEG0; 61 unsigned long end = (start + size); 62 63 while(start < end) { 64 cache_unroll(start,Index_Invalidate_I); 65 start += lsize; 66 } 67} 68 69static __inline__ void blast_dcache(unsigned long size, unsigned long lsize) 70{ 71 unsigned long start = KSEG0; 72 unsigned long end = (start + size); 73 74 while(start < end) { 75 cache_unroll(start,Index_Writeback_Inv_D); 76 start += lsize; 77 } 78} 79 80#define TRX_MAGIC 0x30524448 /* "HDR0" */ 81 82struct trx_header { 83 unsigned int magic; /* "HDR0" */ 84 unsigned int len; /* Length of file including header */ 85 unsigned int crc32; /* 32-bit CRC from flag_version to end of file */ 86 unsigned int flag_version; /* 0:15 flags, 16:31 version */ 87 unsigned int offsets[3]; /* Offsets of partitions from start of header */ 88}; 89 90#define EDIMAX_PS_HEADER_MAGIC 0x36315350 /* "PS16" */ 91#define EDIMAX_PS_HEADER_LEN 0xc /* 12 bytes long for edimax header */ 92 93/* beyound the image end, size not known in advance */ 94extern unsigned char workspace[]; 95 96unsigned int offset; 97unsigned char *data; 98 99/* flash access should be aligned, so wrapper is used */ 100/* read byte from the flash, all accesses are 32-bit aligned */ 101static int read_byte(void *object, unsigned char **buffer, UInt32 *bufferSize) 102{ 103 static unsigned int val; 104 105 if (((unsigned int)offset % 4) == 0) { 106 val = *(unsigned int *)data; 107 data += 4; 108 } 109 110 *bufferSize = 1; 111 *buffer = ((unsigned char *)&val) + (offset++ & 3); 112 113 return LZMA_RESULT_OK; 114} 115 116static __inline__ unsigned char get_byte(void) 117{ 118 unsigned char *buffer; 119 UInt32 fake; 120 121 return read_byte(0, &buffer, &fake), *buffer; 122} 123 124/* should be the first function */ 125void entry(unsigned long icache_size, unsigned long icache_lsize, 126 unsigned long dcache_size, unsigned long dcache_lsize, 127 unsigned long fw_arg0, unsigned long fw_arg1, 128 unsigned long fw_arg2, unsigned long fw_arg3) 129{ 130 unsigned int i; /* temp value */ 131 unsigned int lc; /* literal context bits */ 132 unsigned int lp; /* literal pos state bits */ 133 unsigned int pb; /* pos state bits */ 134 unsigned int osize; /* uncompressed size */ 135 136 ILzmaInCallback callback; 137 callback.Read = read_byte; 138 139 /* look for trx header, 32-bit data access */ 140 for (data = ((unsigned char *) KSEG1ADDR(BCM4710_FLASH)); 141 ((struct trx_header *)data)->magic != TRX_MAGIC && 142 ((struct trx_header *)data)->magic != EDIMAX_PS_HEADER_MAGIC; 143 data += 65536); 144 145 if (((struct trx_header *)data)->magic == EDIMAX_PS_HEADER_MAGIC) 146 data += EDIMAX_PS_HEADER_LEN; 147 /* compressed kernel is in the partition 0 or 1 */ 148 if (((struct trx_header *)data)->offsets[1] > 65536) 149 data += ((struct trx_header *)data)->offsets[0]; 150 else 151 data += ((struct trx_header *)data)->offsets[1]; 152 153 offset = 0; 154 155 /* lzma args */ 156 i = get_byte(); 157 lc = i % 9, i = i / 9; 158 lp = i % 5, pb = i / 5; 159 160 /* skip rest of the LZMA coder property */ 161 for (i = 0; i < 4; i++) 162 get_byte(); 163 164 /* read the lower half of uncompressed size in the header */ 165 osize = ((unsigned int)get_byte()) + 166 ((unsigned int)get_byte() << 8) + 167 ((unsigned int)get_byte() << 16) + 168 ((unsigned int)get_byte() << 24); 169 170 /* skip rest of the header (upper half of uncompressed size) */ 171 for (i = 0; i < 4; i++) 172 get_byte(); 173 174 /* decompress kernel */ 175 if (LzmaDecode(workspace, ~0, lc, lp, pb, &callback, 176 (unsigned char*)LOADADDR, osize, &i) == LZMA_RESULT_OK) 177 { 178 blast_dcache(dcache_size, dcache_lsize); 179 blast_icache(icache_size, icache_lsize); 180 181 /* Jump to load address */ 182 ((void (*)(unsigned long, unsigned long, unsigned long, 183 unsigned long)) LOADADDR)(fw_arg0, fw_arg1, fw_arg2, 184 fw_arg3); 185 } 186} 187