release/src/lzma-loader/decompress.c

   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 #include "trxhdr.h"
  37
  38 #define BCM4710_FLASH           0x1fc00000      /* Flash */
  39
  40 #define KSEG0                   0x80000000
  41 #define KSEG1                   0xa0000000
  42
  43 #define KSEG1ADDR(a)            ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
  44
  45 #define Index_Invalidate_I      0x00
  46 #define Index_Writeback_Inv_D   0x01
  47
  48 #define cache_unroll(base,op)   \
  49         __asm__ __volatile__(           \
  50                 ".set noreorder;\n"             \
  51                 ".set mips3;\n"                 \
  52                 "cache %1, (%0);\n"             \
  53                 ".set mips0;\n"                 \
  54                 ".set reorder\n"                \
  55                 :                                               \
  56                 : "r" (base),                   \
  57                   "i" (op));
  58
  59 static __inline__ void blast_icache(unsigned long size, unsigned long lsize)
  60 {
  61         unsigned long start = KSEG0;
  62         unsigned long end = (start + size);
  63
  64         while(start < end) {
  65                 cache_unroll(start,Index_Invalidate_I);
  66                 start += lsize;
  67         }
  68 }
  69
  70 static __inline__ void blast_dcache(unsigned long size, unsigned long lsize)
  71 {
  72         unsigned long start = KSEG0;
  73         unsigned long end = (start + size);
  74
  75         while(start < end) {
  76                 cache_unroll(start,Index_Writeback_Inv_D);
  77                 start += lsize;
  78         }
  79 }
  80
  81 /* beyound the image end, size not known in advance */
  82 extern unsigned char workspace[];
  83
  84 static unsigned int offset;
  85 static unsigned char *data;
  86
  87 /* flash access should be aligned, so wrapper is used */
  88 /* read byte from the flash, all accesses are 32-bit aligned */
  89 static int read_byte(void *object, const unsigned char **buffer, UInt32 *bufferSize)
  90 {
  91         static unsigned int val;
  92
  93         if (((unsigned int)offset % 4) == 0) {
  94                 val = *(unsigned int *)data;
  95                 data += 4;
  96         }
  97
  98         *bufferSize = 1;
  99         *buffer = ((unsigned char *)&val) + (offset++ & 3);
 100
 101         return LZMA_RESULT_OK;
 102 }
 103
 104 static __inline__ unsigned char get_byte(void)
 105 {
 106         const unsigned char *buffer;
 107         UInt32 fake;
 108
 109         return read_byte(NULL, &buffer, &fake), *buffer;
 110 }
 111
 112 /* should be the first function */
 113 void entry(unsigned long icache_size, unsigned long icache_lsize,
 114         unsigned long dcache_size, unsigned long dcache_lsize,
 115         unsigned long fw_arg0, unsigned long fw_arg1,
 116         unsigned long fw_arg2, unsigned long fw_arg3)
 117 {
 118         unsigned int i;  /* temp value */
 119         unsigned int osize; /* uncompressed size */
 120
 121         CLzmaDecoderState vs;
 122         ILzmaInCallback callback;
 123         callback.Read = read_byte;
 124
 125         /* look for trx header, 32-bit data access */
 126         data = ((unsigned char *) KSEG1ADDR(BCM4710_FLASH));
 127         while (1) {
 128                 if ( ((struct trx_header *)data)->magic == TRX_MAGIC
 129 #ifdef TRX_MAGIC_F7D3301
 130                   || ((struct trx_header *)data)->magic == TRX_MAGIC_F7D3301
 131 #endif
 132 #ifdef TRX_MAGIC_F7D3302
 133                   || ((struct trx_header *)data)->magic == TRX_MAGIC_F7D3302
 134 #endif
 135 #ifdef TRX_MAGIC_F7D4302
 136                   || ((struct trx_header *)data)->magic == TRX_MAGIC_F7D4302
 137 #endif
 138 #ifdef TRX_MAGIC_F5D8235V3
 139                   || ((struct trx_header *)data)->magic == TRX_MAGIC_F5D8235V3
 140 #endif
 141                   )
 142                         break;
 143                 data += 65536;
 144         }
 145
 146         /* compressed kernel is in the partition 1 */
 147         data += ((struct trx_header *)data)->offsets[1];
 148         offset = 0;
 149
 150         /* lzma args */
 151         i = get_byte();
 152         vs.Properties.lc = i % 9, i = i / 9;
 153         vs.Properties.lp = i % 5, vs.Properties.pb = i / 5;
 154         vs.Probs = (CProb *)workspace;
 155
 156         /* skip rest of the LZMA coder property */
 157         for (i = 0; i < 4; i++)
 158                 get_byte();
 159
 160         /* read the lower half of uncompressed size in the header */
 161         osize = ((unsigned int)get_byte()) +
 162                 ((unsigned int)get_byte() << 8) +
 163                 ((unsigned int)get_byte() << 16) +
 164                 ((unsigned int)get_byte() << 24);
 165
 166         /* skip rest of the header (upper half of uncompressed size) */
 167         for (i = 0; i < 4; i++)
 168                 get_byte();
 169
 170         /* decompress kernel */
 171         if (LzmaDecode(&vs, &callback,
 172                 (unsigned char*)LOADADDR, osize, &i) == LZMA_RESULT_OK)
 173         {
 174                 blast_dcache(dcache_size, dcache_lsize);
 175                 blast_icache(icache_size, icache_lsize);
 176
 177                 /* Jump to load address */
 178                 ((void (*)(unsigned long, unsigned long, unsigned long,
 179                             unsigned long)) LOADADDR)(fw_arg0, fw_arg1, fw_arg2,
 180                             fw_arg3);
 181         }
 182 }