OpenWrt – Blame information for rev 1
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1 | office | 1 | /* |
2 | * |
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3 | * LZMA compressed kernel decompressor for ADM5120 boards |
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4 | * |
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5 | * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su> |
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6 | * Copyright (C) 2007-2008 OpenWrt.org |
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7 | * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org> |
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8 | * |
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9 | * This program is free software; you can redistribute it and/or modify |
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10 | * it under the terms of the GNU General Public License as published by |
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11 | * the Free Software Foundation; either version 2 of the License, or |
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12 | * (at your option) any later version. |
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13 | * |
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14 | * This program is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this program; if not, write to the Free Software |
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21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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22 | * |
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23 | * |
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24 | * Please note, this was code based on the bunzip2 decompressor code |
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25 | * by Manuel Novoa III (mjn3@codepoet.org), although the only thing left |
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26 | * is an idea and part of original vendor code |
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27 | * |
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28 | * |
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29 | * 12-Mar-2005 Mineharu Takahara <mtakahar@yahoo.com> |
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30 | * pass actual output size to decoder (stream mode |
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31 | * compressed input is not a requirement anymore) |
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32 | * |
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33 | * 24-Apr-2005 Oleg I. Vdovikin |
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34 | * reordered functions using lds script, removed forward decl |
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35 | * |
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36 | * 24-Mar-2007 Gabor Juhos |
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37 | * pass original values of the a0,a1,a2,a3 registers to the kernel |
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38 | * |
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39 | * 19-May-2007 Gabor Juhos |
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40 | * endiannes related cleanups |
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41 | * add support for decompressing an embedded kernel |
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42 | * |
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43 | */ |
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44 | |||
45 | #include <stddef.h> |
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46 | |||
47 | #include "config.h" |
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48 | #include "printf.h" |
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49 | #include "LzmaDecode.h" |
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50 | |||
51 | #define ADM5120_FLASH_START 0x1fc00000 /* Flash start */ |
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52 | #define ADM5120_FLASH_END 0x1fe00000 /* Flash end */ |
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53 | |||
54 | #define KSEG0 0x80000000 |
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55 | #define KSEG1 0xa0000000 |
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56 | |||
57 | #define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1) |
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58 | |||
59 | #define Index_Invalidate_I 0x00 |
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60 | #define Index_Writeback_Inv_D 0x01 |
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61 | |||
62 | #define cache_unroll(base,op) \ |
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63 | __asm__ __volatile__( \ |
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64 | ".set noreorder;\n" \ |
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65 | ".set mips3;\n" \ |
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66 | "cache %1, (%0);\n" \ |
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67 | ".set mips0;\n" \ |
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68 | ".set reorder\n" \ |
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69 | : \ |
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70 | : "r" (base), \ |
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71 | "i" (op)); |
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72 | |||
73 | #ifdef LZMA_DEBUG |
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74 | # define DBG(f, a...) printf(f, ## a) |
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75 | #else |
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76 | # define DBG(f, a...) do {} while (0) |
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77 | #endif |
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78 | |||
79 | static __inline__ void blast_icache(unsigned long size, unsigned long lsize) |
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80 | { |
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81 | unsigned long start = KSEG0; |
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82 | unsigned long end = (start + size); |
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83 | |||
84 | while(start < end) { |
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85 | cache_unroll(start,Index_Invalidate_I); |
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86 | start += lsize; |
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87 | } |
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88 | } |
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89 | |||
90 | static __inline__ void blast_dcache(unsigned long size, unsigned long lsize) |
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91 | { |
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92 | unsigned long start = KSEG0; |
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93 | unsigned long end = (start + size); |
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94 | |||
95 | while(start < end) { |
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96 | cache_unroll(start,Index_Writeback_Inv_D); |
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97 | start += lsize; |
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98 | } |
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99 | } |
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100 | |||
101 | #define TRX_MAGIC 0x30524448 /* "HDR0" */ |
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102 | #define TRX_ALIGN 0x1000 |
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103 | |||
104 | struct trx_header { |
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105 | unsigned int magic; /* "HDR0" */ |
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106 | unsigned int len; /* Length of file including header */ |
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107 | unsigned int crc32; /* 32-bit CRC from flag_version to end of file */ |
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108 | unsigned int flag_version; /* 0:15 flags, 16:31 version */ |
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109 | unsigned int offsets[3]; /* Offsets of partitions from start of header */ |
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110 | }; |
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111 | |||
112 | struct env_var { |
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113 | char *name; |
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114 | char *value; |
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115 | }; |
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116 | |||
117 | /* beyound the image end, size not known in advance */ |
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118 | extern unsigned char workspace[]; |
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119 | extern void board_init(void); |
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120 | |||
121 | static CLzmaDecoderState lzma_state; |
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122 | |||
123 | typedef void (*kernel_entry)(unsigned long reg_a0, unsigned long reg_a1, |
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124 | unsigned long reg_a2, unsigned long reg_a3); |
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125 | |||
126 | static int decompress_data(CLzmaDecoderState *vs, unsigned char *outStream, |
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127 | UInt32 outSize); |
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128 | |||
129 | #ifdef CONFIG_PASS_KARGS |
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130 | #define ENVV(n,v) {.name = (n), .value = (v)} |
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131 | struct env_var env_vars[] = { |
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132 | ENVV("board_name", CONFIG_BOARD_NAME), |
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133 | ENVV(NULL, NULL) |
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134 | }; |
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135 | #endif |
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136 | |||
137 | static void halt(void) |
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138 | { |
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139 | printf("\nSystem halted!\n"); |
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140 | for(;;); |
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141 | } |
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142 | |||
143 | #if (LZMA_WRAPPER) |
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144 | extern unsigned char _lzma_data_start[]; |
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145 | extern unsigned char _lzma_data_end[]; |
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146 | |||
147 | unsigned char *data; |
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148 | unsigned long datalen; |
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149 | |||
150 | static __inline__ unsigned char get_byte(void) |
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151 | { |
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152 | datalen--; |
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153 | return *data++; |
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154 | } |
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155 | |||
156 | static void decompress_init(void) |
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157 | { |
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158 | data = _lzma_data_start; |
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159 | datalen = _lzma_data_end - _lzma_data_start; |
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160 | } |
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161 | |||
162 | static int decompress_data(CLzmaDecoderState *vs, unsigned char *outStream, |
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163 | SizeT outSize) |
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164 | { |
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165 | SizeT ip, op; |
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166 | |||
167 | return LzmaDecode(vs, data, datalen, &ip, outStream, outSize, &op); |
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168 | } |
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169 | #endif /* LZMA_WRAPPER */ |
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170 | |||
171 | #if !(LZMA_WRAPPER) |
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172 | |||
173 | #define FLASH_BANK_SIZE (2<<20) |
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174 | |||
175 | static unsigned char *flash_base = (unsigned char *) KSEG1ADDR(ADM5120_FLASH_START); |
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176 | static unsigned long flash_ofs = 0; |
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177 | static unsigned long flash_max = 0; |
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178 | static unsigned long flash_ofs_mask = (FLASH_BANK_SIZE-1); |
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179 | |||
180 | static __inline__ unsigned char get_byte(void) |
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181 | { |
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182 | return *(flash_base+flash_ofs++); |
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183 | } |
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184 | |||
185 | static int lzma_read_byte(void *object, const unsigned char **buffer, |
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186 | SizeT *bufferSize) |
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187 | { |
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188 | unsigned long len; |
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189 | |||
190 | if (flash_ofs >= flash_max) |
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191 | return LZMA_RESULT_DATA_ERROR; |
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192 | |||
193 | len = flash_max-flash_ofs; |
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194 | |||
195 | #if (CONFIG_FLASH_SIZE > FLASH_BANK_SIZE) |
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196 | if (flash_ofs < FLASH_BANK_SIZE) { |
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197 | /* switch to bank 0 */ |
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198 | DBG("lzma_read_byte: switch to bank 0\n"); |
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199 | |||
200 | if (len > FLASH_BANK_SIZE-flash_ofs) |
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201 | len = FLASH_BANK_SIZE-flash_ofs; |
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202 | } else { |
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203 | /* switch to bank 1 */ |
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204 | DBG("lzma_read_byte: switch to bank 1\n"); |
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205 | } |
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206 | #endif |
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207 | DBG("lzma_read_byte: ofs=%08X, len=%08X\n", flash_ofs, len); |
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208 | |||
209 | *buffer = flash_base+(flash_ofs & flash_ofs_mask); |
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210 | *bufferSize = len; |
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211 | flash_ofs += len; |
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212 | |||
213 | return LZMA_RESULT_OK; |
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214 | } |
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215 | |||
216 | static ILzmaInCallback lzma_callback = { |
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217 | .Read = lzma_read_byte, |
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218 | }; |
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219 | |||
220 | static __inline__ unsigned int read_le32(void *buf) |
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221 | { |
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222 | unsigned char *p = buf; |
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223 | |||
224 | return ((unsigned int)p[0] + ((unsigned int)p[1] << 8) + |
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225 | ((unsigned int)p[2] << 16) +((unsigned int)p[3] << 24)); |
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226 | } |
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227 | |||
228 | static void decompress_init(void) |
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229 | { |
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230 | struct trx_header *hdr = NULL; |
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231 | unsigned long kofs,klen; |
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232 | |||
233 | printf("Looking for TRX header... "); |
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234 | /* look for trx header, 32-bit data access */ |
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235 | for (flash_ofs = 0; flash_ofs < FLASH_BANK_SIZE; flash_ofs += TRX_ALIGN) { |
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236 | if (read_le32(&flash_base[flash_ofs]) == TRX_MAGIC) { |
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237 | hdr = (struct trx_header *)&flash_base[flash_ofs]; |
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238 | break; |
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239 | } |
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240 | } |
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241 | |||
242 | if (hdr == NULL) { |
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243 | printf("not found!\n"); |
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244 | /* no compressed kernel found, halting */ |
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245 | halt(); |
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246 | } |
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247 | |||
248 | /* compressed kernel is in the partition 0 or 1 */ |
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249 | kofs = read_le32(&hdr->offsets[1]); |
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250 | if (kofs == 0 || kofs > 65536) { |
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251 | klen = kofs-read_le32(&hdr->offsets[0]); |
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252 | kofs = read_le32(&hdr->offsets[0]); |
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253 | } else { |
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254 | klen = read_le32(&hdr->offsets[2]); |
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255 | if (klen > kofs) |
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256 | klen -= kofs; |
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257 | else |
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258 | klen = read_le32(&hdr->len)-kofs; |
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259 | } |
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260 | |||
261 | printf("found at %08X, kernel:%08X len:%08X\n", flash_ofs, |
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262 | kofs, klen); |
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263 | |||
264 | flash_ofs += kofs; |
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265 | flash_max = flash_ofs+klen; |
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266 | } |
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267 | |||
268 | static int decompress_data(CLzmaDecoderState *vs, unsigned char *outStream, |
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269 | SizeT outSize) |
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270 | { |
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271 | SizeT op; |
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272 | |||
273 | #if 0 |
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274 | vs->Buffer = data; |
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275 | vs->BufferLim = datalen; |
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276 | #endif |
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277 | |||
278 | return LzmaDecode(vs, &lzma_callback, outStream, outSize, &op); |
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279 | } |
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280 | #endif /* !(LZMA_WRAPPER) */ |
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281 | |||
282 | /* should be the first function */ |
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283 | void decompress_entry(unsigned long reg_a0, unsigned long reg_a1, |
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284 | unsigned long reg_a2, unsigned long reg_a3, |
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285 | unsigned long icache_size, unsigned long icache_lsize, |
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286 | unsigned long dcache_size, unsigned long dcache_lsize) |
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287 | { |
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288 | unsigned char props[LZMA_PROPERTIES_SIZE]; |
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289 | unsigned int i; /* temp value */ |
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290 | SizeT osize; /* uncompressed size */ |
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291 | int res; |
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292 | |||
293 | board_init(); |
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294 | |||
295 | printf("\n\nLZMA loader for " CONFIG_BOARD_NAME |
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296 | ", Copyright (C) 2007-2008 OpenWrt.org\n\n"); |
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297 | |||
298 | decompress_init(); |
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299 | |||
300 | /* lzma args */ |
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301 | for (i = 0; i < LZMA_PROPERTIES_SIZE; i++) |
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302 | props[i] = get_byte(); |
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303 | |||
304 | /* skip rest of the LZMA coder property */ |
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305 | /* read the lower half of uncompressed size in the header */ |
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306 | osize = ((SizeT)get_byte()) + |
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307 | ((SizeT)get_byte() << 8) + |
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308 | ((SizeT)get_byte() << 16) + |
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309 | ((SizeT)get_byte() << 24); |
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310 | |||
311 | /* skip rest of the header (upper half of uncompressed size) */ |
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312 | for (i = 0; i < 4; i++) |
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313 | get_byte(); |
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314 | |||
315 | res = LzmaDecodeProperties(&lzma_state.Properties, props, |
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316 | LZMA_PROPERTIES_SIZE); |
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317 | if (res != LZMA_RESULT_OK) { |
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318 | printf("Incorrect LZMA stream properties!\n"); |
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319 | halt(); |
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320 | } |
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321 | |||
322 | printf("decompressing kernel... "); |
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323 | |||
324 | lzma_state.Probs = (CProb *)workspace; |
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325 | res = decompress_data(&lzma_state, (unsigned char *)LOADADDR, osize); |
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326 | |||
327 | if (res != LZMA_RESULT_OK) { |
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328 | printf("failed, "); |
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329 | switch (res) { |
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330 | case LZMA_RESULT_DATA_ERROR: |
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331 | printf("data error!\n"); |
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332 | break; |
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333 | default: |
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334 | printf("unknown error %d!\n", res); |
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335 | } |
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336 | halt(); |
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337 | } else |
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338 | printf("done!\n"); |
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339 | |||
340 | blast_dcache(dcache_size, dcache_lsize); |
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341 | blast_icache(icache_size, icache_lsize); |
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342 | |||
343 | printf("launching kernel...\n\n"); |
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344 | |||
345 | #ifdef CONFIG_PASS_KARGS |
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346 | reg_a0 = 0; |
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347 | reg_a1 = 0; |
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348 | reg_a2 = (unsigned long)env_vars; |
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349 | reg_a3 = 0; |
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350 | #endif |
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351 | /* Jump to load address */ |
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352 | ((kernel_entry) LOADADDR)(reg_a0, reg_a1, reg_a2, reg_a3); |
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353 | } |