target/linux/adm5120/image/lzma-loader/src/decompress.c

   1 /*
   2  * $Id$
   3  *
   4  * LZMA compressed kernel decompressor for ADM5120 boards
   5  *
   6  * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
   7  * Copyright (C) 2007-2008 OpenWrt.org
   8  * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  *
  24  *
  25  * Please note, this was code based on the bunzip2 decompressor code
  26  * by Manuel Novoa III  (mjn3@codepoet.org), although the only thing left
  27  * is an idea and part of original vendor code
  28  *
  29  *
  30  * 12-Mar-2005  Mineharu Takahara <mtakahar@yahoo.com>
  31  *   pass actual output size to decoder (stream mode
  32  *   compressed input is not a requirement anymore)
  33  *
  34  * 24-Apr-2005 Oleg I. Vdovikin
  35  *   reordered functions using lds script, removed forward decl
  36  *
  37  * 24-Mar-2007 Gabor Juhos
  38  *   pass original values of the a0,a1,a2,a3 registers to the kernel
  39  *
  40  * 19-May-2007 Gabor Juhos
  41  *   endiannes related cleanups
  42  *   add support for decompressing an embedded kernel
  43  *
  44  */
  45
  46 #include <stddef.h>
  47
  48 #include "config.h"
  49 #include "printf.h"
  50 #include "LzmaDecode.h"
  51
  52 #define ADM5120_FLASH_START     0x1fc00000      /* Flash start */
  53 #define ADM5120_FLASH_END       0x1fe00000      /* Flash end */
  54
  55 #define KSEG0                   0x80000000
  56 #define KSEG1                   0xa0000000
  57
  58 #define KSEG1ADDR(a)            ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
  59
  60 #define Index_Invalidate_I      0x00
  61 #define Index_Writeback_Inv_D   0x01
  62
  63 #define cache_unroll(base,op)   \
  64         __asm__ __volatile__(           \
  65                 ".set noreorder;\n"             \
  66                 ".set mips3;\n"                 \
  67                 "cache %1, (%0);\n"             \
  68                 ".set mips0;\n"                 \
  69                 ".set reorder\n"                \
  70                 :                               \
  71                 : "r" (base),                   \
  72                   "i" (op));
  73
  74 #ifdef LZMA_DEBUG
  75 #  define DBG(f, a...)  printf(f, ## a)
  76 #else
  77 #  define DBG(f, a...)  do {} while (0)
  78 #endif
  79
  80 static __inline__ void blast_icache(unsigned long size, unsigned long lsize)
  81 {
  82         unsigned long start = KSEG0;
  83         unsigned long end = (start + size);
  84
  85         while(start < end) {
  86                 cache_unroll(start,Index_Invalidate_I);
  87                 start += lsize;
  88         }
  89 }
  90
  91 static __inline__ void blast_dcache(unsigned long size, unsigned long lsize)
  92 {
  93         unsigned long start = KSEG0;
  94         unsigned long end = (start + size);
  95
  96         while(start < end) {
  97                 cache_unroll(start,Index_Writeback_Inv_D);
  98                 start += lsize;
  99         }
 100 }
 101
 102 #define TRX_MAGIC       0x30524448      /* "HDR0" */
 103 #define TRX_ALIGN       0x1000
 104
 105 struct trx_header {
 106         unsigned int magic;             /* "HDR0" */
 107         unsigned int len;               /* Length of file including header */
 108         unsigned int crc32;             /* 32-bit CRC from flag_version to end of file */
 109         unsigned int flag_version;      /* 0:15 flags, 16:31 version */
 110         unsigned int offsets[3];        /* Offsets of partitions from start of header */
 111 };
 112
 113 struct env_var {
 114         char    *name;
 115         char    *value;
 116 };
 117
 118 /* beyound the image end, size not known in advance */
 119 extern unsigned char workspace[];
 120 extern void board_init(void);
 121
 122 static CLzmaDecoderState lzma_state;
 123
 124 typedef void (*kernel_entry)(unsigned long reg_a0, unsigned long reg_a1,
 125         unsigned long reg_a2, unsigned long reg_a3);
 126
 127 static int decompress_data(CLzmaDecoderState *vs, unsigned char *outStream,
 128                         UInt32 outSize);
 129
 130 #ifdef CONFIG_PASS_KARGS
 131 #define ENVV(n,v)       {.name = (n), .value = (v)}
 132 struct env_var env_vars[] = {
 133         ENVV("board_name",      CONFIG_BOARD_NAME),
 134         ENVV(NULL, NULL)
 135 };
 136 #endif
 137
 138 static void halt(void)
 139 {
 140         printf("\nSystem halted!\n");
 141         for(;;);
 142 }
 143
 144 #if (LZMA_WRAPPER)
 145 extern unsigned char _lzma_data_start[];
 146 extern unsigned char _lzma_data_end[];
 147
 148 unsigned char *data;
 149 unsigned long datalen;
 150
 151 static __inline__ unsigned char get_byte(void)
 152 {
 153         datalen--;
 154         return *data++;
 155 }
 156
 157 static void decompress_init(void)
 158 {
 159         data = _lzma_data_start;
 160         datalen = _lzma_data_end - _lzma_data_start;
 161 }
 162
 163 static int decompress_data(CLzmaDecoderState *vs, unsigned char *outStream,
 164                         SizeT outSize)
 165 {
 166         SizeT ip, op;
 167
 168         return LzmaDecode(vs, data, datalen, &ip, outStream, outSize, &op);
 169 }
 170 #endif /* LZMA_WRAPPER */
 171
 172 #if !(LZMA_WRAPPER)
 173
 174 #define FLASH_BANK_SIZE (2<<20)
 175
 176 static unsigned char *flash_base = (unsigned char *) KSEG1ADDR(ADM5120_FLASH_START);
 177 static unsigned long flash_ofs = 0;
 178 static unsigned long flash_max = 0;
 179 static unsigned long flash_ofs_mask = (FLASH_BANK_SIZE-1);
 180
 181 static __inline__ unsigned char get_byte(void)
 182 {
 183         return *(flash_base+flash_ofs++);
 184 }
 185
 186 static int lzma_read_byte(void *object, const unsigned char **buffer,
 187                                 SizeT *bufferSize)
 188 {
 189         unsigned long len;
 190
 191         if (flash_ofs >= flash_max)
 192                 return LZMA_RESULT_DATA_ERROR;
 193
 194         len = flash_max-flash_ofs;
 195
 196 #if (CONFIG_FLASH_SIZE > FLASH_BANK_SIZE)
 197         if (flash_ofs < FLASH_BANK_SIZE) {
 198                 /* switch to bank 0 */
 199                 DBG("lzma_read_byte: switch to bank 0\n");
 200
 201                 if (len > FLASH_BANK_SIZE-flash_ofs)
 202                         len = FLASH_BANK_SIZE-flash_ofs;
 203         } else {
 204                 /* switch to bank 1 */
 205                 DBG("lzma_read_byte: switch to bank 1\n");
 206         }
 207 #endif
 208         DBG("lzma_read_byte: ofs=%08X, len=%08X\n", flash_ofs, len);
 209
 210         *buffer = flash_base+(flash_ofs & flash_ofs_mask);
 211         *bufferSize = len;
 212         flash_ofs += len;
 213
 214         return LZMA_RESULT_OK;
 215 }
 216
 217 static ILzmaInCallback lzma_callback = {
 218         .Read   = lzma_read_byte,
 219 };
 220
 221 static __inline__ unsigned int read_le32(void *buf)
 222 {
 223         unsigned char *p = buf;
 224
 225         return ((unsigned int)p[0] + ((unsigned int)p[1] << 8) +
 226                 ((unsigned int)p[2] << 16) +((unsigned int)p[3] << 24));
 227 }
 228
 229 static void decompress_init(void)
 230 {
 231         struct trx_header *hdr = NULL;
 232         unsigned long kofs,klen;
 233
 234         printf("Looking for TRX header... ");
 235         /* look for trx header, 32-bit data access */
 236         for (flash_ofs = 0; flash_ofs < FLASH_BANK_SIZE; flash_ofs += TRX_ALIGN) {
 237                 if (read_le32(&flash_base[flash_ofs]) == TRX_MAGIC) {
 238                         hdr = (struct trx_header *)&flash_base[flash_ofs];
 239                         break;
 240                 }
 241         }
 242
 243         if (hdr == NULL) {
 244                 printf("not found!\n");
 245                 /* no compressed kernel found, halting */
 246                 halt();
 247         }
 248
 249         /* compressed kernel is in the partition 0 or 1 */
 250         kofs = read_le32(&hdr->offsets[1]);
 251         if (kofs == 0 || kofs > 65536) {
 252                 klen = kofs-read_le32(&hdr->offsets[0]);
 253                 kofs = read_le32(&hdr->offsets[0]);
 254         } else {
 255                 klen = read_le32(&hdr->offsets[2]);
 256                 if (klen > kofs)
 257                         klen -= kofs;
 258                 else
 259                         klen = read_le32(&hdr->len)-kofs;
 260         }
 261
 262         printf("found at %08X, kernel:%08X len:%08X\n", flash_ofs,
 263                 kofs, klen);
 264
 265         flash_ofs += kofs;
 266         flash_max = flash_ofs+klen;
 267 }
 268
 269 static int decompress_data(CLzmaDecoderState *vs, unsigned char *outStream,
 270                         SizeT outSize)
 271 {
 272         SizeT op;
 273
 274 #if 0
 275         vs->Buffer = data;
 276         vs->BufferLim = datalen;
 277 #endif
 278
 279         return LzmaDecode(vs, &lzma_callback, outStream, outSize, &op);
 280 }
 281 #endif /* !(LZMA_WRAPPER) */
 282
 283 /* should be the first function */
 284 void decompress_entry(unsigned long reg_a0, unsigned long reg_a1,
 285         unsigned long reg_a2, unsigned long reg_a3,
 286         unsigned long icache_size, unsigned long icache_lsize,
 287         unsigned long dcache_size, unsigned long dcache_lsize)
 288 {
 289         unsigned char props[LZMA_PROPERTIES_SIZE];
 290         unsigned int i;  /* temp value */
 291         SizeT osize; /* uncompressed size */
 292         int res;
 293
 294         board_init();
 295
 296         printf("\n\nLZMA loader for " CONFIG_BOARD_NAME
 297                         ", Copyright (C) 2007-2008 OpenWrt.org\n\n");
 298
 299         decompress_init();
 300
 301         /* lzma args */
 302         for (i = 0; i < LZMA_PROPERTIES_SIZE; i++)
 303                 props[i] = get_byte();
 304
 305         /* skip rest of the LZMA coder property */
 306         /* read the lower half of uncompressed size in the header */
 307         osize = ((SizeT)get_byte()) +
 308                 ((SizeT)get_byte() << 8) +
 309                 ((SizeT)get_byte() << 16) +
 310                 ((SizeT)get_byte() << 24);
 311
 312         /* skip rest of the header (upper half of uncompressed size) */
 313         for (i = 0; i < 4; i++)
 314                 get_byte();
 315
 316         res = LzmaDecodeProperties(&lzma_state.Properties, props,
 317                                         LZMA_PROPERTIES_SIZE);
 318         if (res != LZMA_RESULT_OK) {
 319                 printf("Incorrect LZMA stream properties!\n");
 320                 halt();
 321         }
 322
 323         printf("decompressing kernel... ");
 324
 325         lzma_state.Probs = (CProb *)workspace;
 326         res = decompress_data(&lzma_state, (unsigned char *)LOADADDR, osize);
 327
 328         if (res != LZMA_RESULT_OK) {
 329                 printf("failed, ");
 330                 switch (res) {
 331                 case LZMA_RESULT_DATA_ERROR:
 332                         printf("data error!\n");
 333                         break;
 334                 default:
 335                         printf("unknown error %d!\n", res);
 336                 }
 337                 halt();
 338         } else
 339                 printf("done!\n");
 340
 341         blast_dcache(dcache_size, dcache_lsize);
 342         blast_icache(icache_size, icache_lsize);
 343
 344         printf("launching kernel...\n\n");
 345
 346 #ifdef CONFIG_PASS_KARGS
 347         reg_a0 = 0;
 348         reg_a1 = 0;
 349         reg_a2 = (unsigned long)env_vars;
 350         reg_a3 = 0;
 351 #endif
 352         /* Jump to load address */
 353         ((kernel_entry) LOADADDR)(reg_a0, reg_a1, reg_a2, reg_a3);
 354 }