| 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 | |
| 58 | static __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 | |
| 69 | static __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 | |
| 82 | struct 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 */ |
| 94 | extern unsigned char workspace[]; |
| 95 | |
| 96 | unsigned int offset; |
| 97 | unsigned 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 */ |
| 101 | static 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 | |
| 116 | static __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 */ |
| 125 | void 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 | |
