2 * LZMA compressed kernel decompressor for bcm947xx boards
4 * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
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.
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.
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
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
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)
30 * 24-Apr-2005 Oleg I. Vdovikin
31 * reordered functions using lds script, removed forward decl
33 * ??-Nov-2005 Mike Baker
34 * reorder the script as an lzma wrapper; do not depend on flash access
37 #include "LzmaDecode.h"
39 #define KSEG0 0x80000000
40 #define KSEG1 0xa0000000
42 #define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
44 #define Index_Invalidate_I 0x00
45 #define Index_Writeback_Inv_D 0x01
47 #define cache_unroll(base,op) \
48 __asm__ __volatile__( \
59 static __inline__
void blast_icache(unsigned long size
, unsigned long lsize
)
61 unsigned long start
= KSEG0
;
62 unsigned long end
= (start
+ size
);
65 cache_unroll(start
,Index_Invalidate_I
);
70 static __inline__
void blast_dcache(unsigned long size
, unsigned long lsize
)
72 unsigned long start
= KSEG0
;
73 unsigned long end
= (start
+ size
);
76 cache_unroll(start
,Index_Writeback_Inv_D
);
83 static int read_byte(void *object
, unsigned char **buffer
, UInt32
*bufferSize
)
88 return LZMA_RESULT_OK
;
91 static __inline__
unsigned char get_byte(void)
93 unsigned char *buffer
;
96 return read_byte(0, &buffer
, &fake
), *buffer
;
99 /* This puts lzma workspace 128k below RAM end.
100 * That should be enough for both lzma and stack
102 static char *buffer
= (char *)(RAMSTART
+ RAMSIZE
- 0x00020000);
103 extern char lzma_start
[];
104 extern char lzma_end
[];
106 /* should be the first function */
107 void entry(unsigned long icache_size
, unsigned long icache_lsize
,
108 unsigned long dcache_size
, unsigned long dcache_lsize
)
110 unsigned int i
; /* temp value */
111 unsigned int osize
; /* uncompressed size */
112 volatile unsigned int arg0
, arg1
, arg2
, arg3
;
114 /* restore argument registers */
115 __asm__
__volatile__ ("ori %0, $12, 0":"=r"(arg0
));
116 __asm__
__volatile__ ("ori %0, $13, 0":"=r"(arg1
));
117 __asm__
__volatile__ ("ori %0, $14, 0":"=r"(arg2
));
118 __asm__
__volatile__ ("ori %0, $15, 0":"=r"(arg3
));
120 ILzmaInCallback callback
;
121 CLzmaDecoderState vs
;
122 callback
.Read
= read_byte
;
128 vs
.Properties
.lc
= i
% 9, i
= i
/ 9;
129 vs
.Properties
.lp
= i
% 5, vs
.Properties
.pb
= i
/ 5;
131 vs
.Probs
= (CProb
*)buffer
;
133 /* skip rest of the LZMA coder property */
134 for (i
= 0; i
< 4; i
++)
137 /* read the lower half of uncompressed size in the header */
138 osize
= ((unsigned int)get_byte()) +
139 ((unsigned int)get_byte() << 8) +
140 ((unsigned int)get_byte() << 16) +
141 ((unsigned int)get_byte() << 24);
143 /* skip rest of the header (upper half of uncompressed size) */
144 for (i
= 0; i
< 4; i
++)
147 /* decompress kernel */
148 if ((i
= LzmaDecode(&vs
, &callback
,
149 (unsigned char*)KERNEL_ENTRY
, osize
, &osize
)) == LZMA_RESULT_OK
)
151 blast_dcache(dcache_size
, dcache_lsize
);
152 blast_icache(icache_size
, icache_lsize
);
154 /* Jump to load address */
155 ((void (*)(int a0
, int a1
, int a2
, int a3
)) KERNEL_ENTRY
)(arg0
, arg1
, arg2
, arg3
);
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