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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
/*
* RouterBoot helper routines
*
* Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#define pr_fmt(fmt) "rb: " fmt
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/routerboot.h>
#include <linux/rle.h>
#include "routerboot.h"
#define RB_BLOCK_SIZE 0x1000
#define RB_ART_SIZE 0x10000
static struct rb_info rb_info;
static u32 get_u32(void *buf)
{
u8 *p = buf;
return ((u32) p[3] + ((u32) p[2] << 8) + ((u32) p[1] << 16) +
((u32) p[0] << 24));
}
static u16 get_u16(void *buf)
{
u8 *p = buf;
return (u16) p[1] + ((u16) p[0] << 8);
}
__init int
routerboot_find_magic(u8 *buf, unsigned int buflen, u32 *offset, bool hard)
{
u32 magic_ref = hard ? RB_MAGIC_HARD : RB_MAGIC_SOFT;
u32 magic;
u32 cur = *offset;
while (cur < buflen) {
magic = get_u32(buf + cur);
if (magic == magic_ref) {
*offset = cur;
return 0;
}
cur += 0x1000;
}
return -ENOENT;
}
__init int
routerboot_find_tag(u8 *buf, unsigned int buflen, u16 tag_id,
u8 **tag_data, u16 *tag_len)
{
uint32_t magic;
int ret;
if (buflen < 4)
return -EINVAL;
magic = get_u32(buf);
switch (magic) {
case RB_MAGIC_HARD:
/* skip magic value */
buf += 4;
buflen -= 4;
break;
case RB_MAGIC_SOFT:
if (buflen < 8)
return -EINVAL;
/* skip magic and CRC value */
buf += 8;
buflen -= 8;
break;
default:
return -EINVAL;
}
ret = -ENOENT;
while (buflen > 2) {
u16 id;
u16 len;
len = get_u16(buf);
buf += 2;
buflen -= 2;
if (buflen < 2)
break;
id = get_u16(buf);
buf += 2;
buflen -= 2;
if (id == RB_ID_TERMINATOR)
break;
if (buflen < len)
break;
if (id == tag_id) {
if (tag_len)
*tag_len = len;
if (tag_data)
*tag_data = buf;
ret = 0;
break;
}
buf += len;
buflen -= len;
}
return ret;
}
static inline int
rb_find_hard_cfg_tag(u16 tag_id, u8 **tag_data, u16 *tag_len)
{
if (!rb_info.hard_cfg_data ||
!rb_info.hard_cfg_size)
return -ENOENT;
return routerboot_find_tag(rb_info.hard_cfg_data,
rb_info.hard_cfg_size,
tag_id, tag_data, tag_len);
}
__init const char *
rb_get_board_name(void)
{
u16 tag_len;
u8 *tag;
int err;
err = rb_find_hard_cfg_tag(RB_ID_BOARD_NAME, &tag, &tag_len);
if (err)
return NULL;
return tag;
}
__init u32
rb_get_hw_options(void)
{
u16 tag_len;
u8 *tag;
int err;
err = rb_find_hard_cfg_tag(RB_ID_HW_OPTIONS, &tag, &tag_len);
if (err)
return 0;
return get_u32(tag);
}
__init void *
rb_get_wlan_data(void)
{
u16 tag_len;
u8 *tag;
void *buf;
int err;
err = rb_find_hard_cfg_tag(RB_ID_WLAN_DATA, &tag, &tag_len);
if (err) {
pr_err("no calibration data found\n");
goto err;
}
buf = kmalloc(RB_ART_SIZE, GFP_KERNEL);
if (buf == NULL) {
pr_err("no memory for calibration data\n");
goto err;
}
err = rle_decode((char *) tag, tag_len, buf, RB_ART_SIZE,
NULL, NULL);
if (err) {
pr_err("unable to decode calibration data\n");
goto err_free;
}
return buf;
err_free:
kfree(buf);
err:
return NULL;
}
__init const struct rb_info *
rb_init_info(void *data, unsigned int size)
{
unsigned int offset;
if (size == 0 || (size % RB_BLOCK_SIZE) != 0)
return NULL;
for (offset = 0; offset < size; offset += RB_BLOCK_SIZE) {
u32 magic;
magic = get_u32(data + offset);
switch (magic) {
case RB_MAGIC_HARD:
rb_info.hard_cfg_offs = offset;
break;
case RB_MAGIC_SOFT:
rb_info.soft_cfg_offs = offset;
break;
}
}
if (!rb_info.hard_cfg_offs) {
pr_err("could not find a valid RouterBOOT hard config\n");
return NULL;
}
if (!rb_info.soft_cfg_offs) {
pr_err("could not find a valid RouterBOOT soft config\n");
return NULL;
}
rb_info.hard_cfg_size = RB_BLOCK_SIZE;
rb_info.hard_cfg_data = kmemdup(data + rb_info.hard_cfg_offs,
RB_BLOCK_SIZE, GFP_KERNEL);
if (!rb_info.hard_cfg_data)
return NULL;
rb_info.board_name = rb_get_board_name();
rb_info.hw_options = rb_get_hw_options();
return &rb_info;
}
|
