OpenWrt – Blame information for rev 4

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4 office 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  
37 #define BCM4710_FLASH 0x1fc00000 /* Flash */
38  
39 #define KSEG0 0x80000000
40 #define KSEG1 0xa0000000
41  
42 #define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
43  
44 #define Index_Invalidate_I 0x00
45 #define Index_Writeback_Inv_D 0x01
46  
47 #define cache_unroll(base,op) \
48 __asm__ __volatile__( \
49 ".set noreorder;\n" \
50 ".set mips3;\n" \
51 "cache %1, (%0);\n" \
52 ".set mips0;\n" \
53 ".set reorder\n" \
54 : \
55 : "r" (base), \
56 "i" (op));
57  
58 static __inline__ void blast_icache(unsigned long size, unsigned long lsize)
59 {
60 unsigned long start = KSEG0;
61 unsigned long end = (start + size);
62  
63 while(start < end) {
64 cache_unroll(start,Index_Invalidate_I);
65 start += lsize;
66 }
67 }
68  
69 static __inline__ void blast_dcache(unsigned long size, unsigned long lsize)
70 {
71 unsigned long start = KSEG0;
72 unsigned long end = (start + size);
73  
74 while(start < end) {
75 cache_unroll(start,Index_Writeback_Inv_D);
76 start += lsize;
77 }
78 }
79  
80 #define TRX_MAGIC 0x30524448 /* "HDR0" */
81  
82 struct trx_header {
83 unsigned int magic; /* "HDR0" */
84 unsigned int len; /* Length of file including header */
85 unsigned int crc32; /* 32-bit CRC from flag_version to end of file */
86 unsigned int flag_version; /* 0:15 flags, 16:31 version */
87 unsigned int offsets[3]; /* Offsets of partitions from start of header */
88 };
89  
90 #define EDIMAX_PS_HEADER_MAGIC 0x36315350 /* "PS16" */
91 #define EDIMAX_PS_HEADER_LEN 0xc /* 12 bytes long for edimax header */
92  
93 /* beyound the image end, size not known in advance */
94 extern unsigned char workspace[];
95  
96 unsigned int offset;
97 unsigned char *data;
98  
99 /* flash access should be aligned, so wrapper is used */
100 /* read byte from the flash, all accesses are 32-bit aligned */
101 static int read_byte(void *object, unsigned char **buffer, UInt32 *bufferSize)
102 {
103 static unsigned int val;
104  
105 if (((unsigned int)offset % 4) == 0) {
106 val = *(unsigned int *)data;
107 data += 4;
108 }
109  
110 *bufferSize = 1;
111 *buffer = ((unsigned char *)&val) + (offset++ & 3);
112  
113 return LZMA_RESULT_OK;
114 }
115  
116 static __inline__ unsigned char get_byte(void)
117 {
118 unsigned char *buffer;
119 UInt32 fake;
120  
121 return read_byte(0, &buffer, &fake), *buffer;
122 }
123  
124 /* should be the first function */
125 void entry(unsigned long icache_size, unsigned long icache_lsize,
126 unsigned long dcache_size, unsigned long dcache_lsize,
127 unsigned long fw_arg0, unsigned long fw_arg1,
128 unsigned long fw_arg2, unsigned long fw_arg3)
129 {
130 unsigned int i; /* temp value */
131 unsigned int lc; /* literal context bits */
132 unsigned int lp; /* literal pos state bits */
133 unsigned int pb; /* pos state bits */
134 unsigned int osize; /* uncompressed size */
135  
136 ILzmaInCallback callback;
137 callback.Read = read_byte;
138  
139 /* look for trx header, 32-bit data access */
140 for (data = ((unsigned char *) KSEG1ADDR(BCM4710_FLASH));
141 ((struct trx_header *)data)->magic != TRX_MAGIC &&
142 ((struct trx_header *)data)->magic != EDIMAX_PS_HEADER_MAGIC;
143 data += 65536);
144  
145 if (((struct trx_header *)data)->magic == EDIMAX_PS_HEADER_MAGIC)
146 data += EDIMAX_PS_HEADER_LEN;
147 /* compressed kernel is in the partition 0 or 1 */
148 if (((struct trx_header *)data)->offsets[1] > 65536)
149 data += ((struct trx_header *)data)->offsets[0];
150 else
151 data += ((struct trx_header *)data)->offsets[1];
152  
153 offset = 0;
154  
155 /* lzma args */
156 i = get_byte();
157 lc = i % 9, i = i / 9;
158 lp = i % 5, pb = i / 5;
159  
160 /* skip rest of the LZMA coder property */
161 for (i = 0; i < 4; i++)
162 get_byte();
163  
164 /* read the lower half of uncompressed size in the header */
165 osize = ((unsigned int)get_byte()) +
166 ((unsigned int)get_byte() << 8) +
167 ((unsigned int)get_byte() << 16) +
168 ((unsigned int)get_byte() << 24);
169  
170 /* skip rest of the header (upper half of uncompressed size) */
171 for (i = 0; i < 4; i++)
172 get_byte();
173  
174 /* decompress kernel */
175 if (LzmaDecode(workspace, ~0, lc, lp, pb, &callback,
176 (unsigned char*)LOADADDR, osize, &i) == LZMA_RESULT_OK)
177 {
178 blast_dcache(dcache_size, dcache_lsize);
179 blast_icache(icache_size, icache_lsize);
180  
181 /* Jump to load address */
182 ((void (*)(unsigned long, unsigned long, unsigned long,
183 unsigned long)) LOADADDR)(fw_arg0, fw_arg1, fw_arg2,
184 fw_arg3);
185 }
186 }