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
|
/*
* $Id$
*
* Parse MyLoader-style flash partition tables and produce a Linux partition
* array to match.
*
* Copyright (C) 2007 OpenWrt.org
* Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
*
* This file was based on drivers/mtd/redboot.c
* Author: Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>
*
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/byteorder/generic.h>
#include <prom/myloader.h>
#define NAME_LEN_MAX 20
#define NAME_MYLOADER "MyLoader"
#define NAME_PARTITION_TABLE "Partition Table"
#define BLOCK_LEN_MIN 0x10000
int parse_myloader_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
unsigned long origin)
{
struct mylo_partition_table *tab;
struct mylo_partition *part;
struct mtd_partition *mtd_parts;
struct mtd_partition *mtd_part;
int num_parts;
int ret, i;
size_t retlen;
size_t parts_len;
char *names;
unsigned long offset;
unsigned long blocklen;
tab = vmalloc(sizeof(*tab));
if (!tab) {
return -ENOMEM;
goto out;
}
blocklen = master->erasesize;
if (blocklen < BLOCK_LEN_MIN)
blocklen = BLOCK_LEN_MIN;
/* Partition Table is always located on the second erase block */
offset = blocklen;
printk(KERN_NOTICE "%s: searching for MyLoader partition table at "
"offset 0x%lx\n", master->name, offset);
ret = master->read(master, offset, sizeof(*tab), &retlen, (void *)tab);
if (ret)
goto out;
if (retlen != sizeof(*tab)) {
ret = -EIO;
goto out_free_buf;
}
/* Check for Partition Table magic number */
if (tab->magic != le32_to_cpu(MYLO_MAGIC_PARTITIONS)) {
printk(KERN_NOTICE "%s: no MyLoader partition table found\n",
master->name);
ret = 0;
goto out_free_buf;
}
/* The MyLoader and the Partition Table is always present */
num_parts = 2;
/* Detect number of used partitions */
for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
part = &tab->partitions[i];
if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
continue;
num_parts++;
}
mtd_parts = kzalloc((num_parts*sizeof(*mtd_part) + num_parts*NAME_LEN_MAX),
GFP_KERNEL);
if (!mtd_parts) {
ret = -ENOMEM;
goto out_free_buf;
}
mtd_part = mtd_parts;
names = (char *)&mtd_parts[num_parts];
strncpy(names, NAME_MYLOADER, NAME_LEN_MAX-1);
mtd_part->name = names;
mtd_part->offset = 0;
mtd_part->size = blocklen;
mtd_part->mask_flags = MTD_WRITEABLE;
mtd_part++;
names += NAME_LEN_MAX;
strncpy(names, NAME_PARTITION_TABLE, NAME_LEN_MAX-1);
mtd_part->name = names;
mtd_part->offset = blocklen;
mtd_part->size = blocklen;
mtd_part->mask_flags = MTD_WRITEABLE;
mtd_part++;
names += NAME_LEN_MAX;
for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
part = &tab->partitions[i];
if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
continue;
sprintf(names, "partition%d", i);
mtd_part->offset = le32_to_cpu(part->addr);
mtd_part->size = le32_to_cpu(part->size);
mtd_part->name = names;
mtd_part++;
names += NAME_LEN_MAX;
}
*pparts = mtd_parts;
ret = num_parts;
out_free_buf:
vfree(tab);
out:
return ret;
}
static struct mtd_part_parser mylo_mtd_parser = {
.owner = THIS_MODULE,
.parse_fn = parse_myloader_partitions,
.name = NAME_MYLOADER,
};
static int __init mylo_mtd_parser_init(void)
{
return register_mtd_parser(&mylo_mtd_parser);
}
static void __exit mylo_mtd_parser_exit(void)
{
deregister_mtd_parser(&mylo_mtd_parser);
}
module_init(mylo_mtd_parser_init);
module_exit(mylo_mtd_parser_exit);
MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
MODULE_DESCRIPTION("Parsing code for MyLoader partition tables");
MODULE_LICENSE("GPL");
|
