1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
/*
* LZMA compressed kernel decompressor for bcm947xx boards
*
* Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
* Please note, this was code based on the bunzip2 decompressor code
* by Manuel Novoa III (mjn3@codepoet.org), although the only thing left
* is an idea and part of original vendor code
*
*
* 12-Mar-2005 Mineharu Takahara <mtakahar@yahoo.com>
* pass actual output size to decoder (stream mode
* compressed input is not a requirement anymore)
*
* 24-Apr-2005 Oleg I. Vdovikin
* reordered functions using lds script, removed forward decl
*
* ??-Nov-2005 Mike Baker
* reorder the script as an lzma wrapper; do not depend on flash access
*/
#include "LzmaDecode.h"
#define LOADADDR 0x80100000
#define KSEG0 0x80000000
#define KSEG1 0xa0000000
#define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
#define Index_Invalidate_I 0x00
#define Index_Writeback_Inv_D 0x01
#define cache_unroll(base,op) \
__asm__ __volatile__( \
".set noreorder;\n" \
".set mips3;\n" \
"cache %1, (%0);\n" \
".set mips0;\n" \
".set reorder\n" \
: \
: "r" (base), \
"i" (op));
static __inline__ void blast_icache(unsigned long size, unsigned long lsize)
{
unsigned long start = KSEG0;
unsigned long end = (start + size);
while(start < end) {
cache_unroll(start,Index_Invalidate_I);
start += lsize;
}
}
static __inline__ void blast_dcache(unsigned long size, unsigned long lsize)
{
unsigned long start = KSEG0;
unsigned long end = (start + size);
while(start < end) {
cache_unroll(start,Index_Writeback_Inv_D);
start += lsize;
}
}
unsigned char *data;
static int read_byte(void *object, unsigned char **buffer, UInt32 *bufferSize)
{
*bufferSize = 1;
*buffer = data;
++data;
return LZMA_RESULT_OK;
}
static __inline__ unsigned char get_byte(void)
{
unsigned char *buffer;
UInt32 fake;
return read_byte(0, &buffer, &fake), *buffer;
}
static char *buffer = (char *)0x80C00000;
extern char lzma_start[];
extern char lzma_end[];
/* should be the first function */
void entry(unsigned long icache_size, unsigned long icache_lsize,
unsigned long dcache_size, unsigned long dcache_lsize)
{
unsigned int i; /* temp value */
unsigned int osize; /* uncompressed size */
ILzmaInCallback callback;
CLzmaDecoderState vs;
callback.Read = read_byte;
data = lzma_start;
/* lzma args */
i = get_byte();
vs.Properties.lc = i % 9, i = i / 9;
vs.Properties.lp = i % 5, vs.Properties.pb = i / 5;
vs.Probs = (CProb *)buffer;
/* skip rest of the LZMA coder property */
for (i = 0; i < 4; i++)
get_byte();
/* read the lower half of uncompressed size in the header */
osize = ((unsigned int)get_byte()) +
((unsigned int)get_byte() << 8) +
((unsigned int)get_byte() << 16) +
((unsigned int)get_byte() << 24);
/* skip rest of the header (upper half of uncompressed size) */
for (i = 0; i < 4; i++)
get_byte();
/* decompress kernel */
if ((i = LzmaDecode(&vs, &callback,
(unsigned char*)LOADADDR, osize, &osize)) == LZMA_RESULT_OK)
{
blast_dcache(dcache_size, dcache_lsize);
blast_icache(icache_size, icache_lsize);
/* Jump to load address */
((void (*)(void)) LOADADDR)();
}
}
|
