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1da177e4 | 1 | /* |
77a33135 | 2 | * $Id: redboot.c,v 1.19 2005/12/01 10:03:51 dwmw2 Exp $ |
1da177e4 LT |
3 | * |
4 | * Parse RedBoot-style Flash Image System (FIS) tables and | |
5 | * produce a Linux partition array to match. | |
6 | */ | |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/vmalloc.h> | |
12 | ||
13 | #include <linux/mtd/mtd.h> | |
14 | #include <linux/mtd/partitions.h> | |
15 | ||
16 | struct fis_image_desc { | |
17 | unsigned char name[16]; // Null terminated name | |
18 | unsigned long flash_base; // Address within FLASH of image | |
19 | unsigned long mem_base; // Address in memory where it executes | |
20 | unsigned long size; // Length of image | |
21 | unsigned long entry_point; // Execution entry point | |
22 | unsigned long data_length; // Length of actual data | |
23 | unsigned char _pad[256-(16+7*sizeof(unsigned long))]; | |
24 | unsigned long desc_cksum; // Checksum over image descriptor | |
25 | unsigned long file_cksum; // Checksum over image data | |
26 | }; | |
27 | ||
28 | struct fis_list { | |
29 | struct fis_image_desc *img; | |
30 | struct fis_list *next; | |
31 | }; | |
32 | ||
33 | static int directory = CONFIG_MTD_REDBOOT_DIRECTORY_BLOCK; | |
34 | module_param(directory, int, 0); | |
35 | ||
36 | static inline int redboot_checksum(struct fis_image_desc *img) | |
37 | { | |
38 | /* RedBoot doesn't actually write the desc_cksum field yet AFAICT */ | |
39 | return 1; | |
40 | } | |
41 | ||
97894cda | 42 | static int parse_redboot_partitions(struct mtd_info *master, |
1da177e4 LT |
43 | struct mtd_partition **pparts, |
44 | unsigned long fis_origin) | |
45 | { | |
46 | int nrparts = 0; | |
47 | struct fis_image_desc *buf; | |
48 | struct mtd_partition *parts; | |
49 | struct fis_list *fl = NULL, *tmp_fl; | |
50 | int ret, i; | |
51 | size_t retlen; | |
52 | char *names; | |
53 | char *nullname; | |
54 | int namelen = 0; | |
55 | int nulllen = 0; | |
56 | int numslots; | |
57 | unsigned long offset; | |
58 | #ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED | |
59 | static char nullstring[] = "unallocated"; | |
60 | #endif | |
61 | ||
62 | buf = vmalloc(master->erasesize); | |
63 | ||
64 | if (!buf) | |
65 | return -ENOMEM; | |
66 | ||
67 | if ( directory < 0 ) | |
68 | offset = master->size + directory*master->erasesize; | |
69 | else | |
70 | offset = directory*master->erasesize; | |
71 | ||
72 | printk(KERN_NOTICE "Searching for RedBoot partition table in %s at offset 0x%lx\n", | |
73 | master->name, offset); | |
74 | ||
75 | ret = master->read(master, offset, | |
76 | master->erasesize, &retlen, (void *)buf); | |
77 | ||
78 | if (ret) | |
79 | goto out; | |
80 | ||
81 | if (retlen != master->erasesize) { | |
82 | ret = -EIO; | |
83 | goto out; | |
84 | } | |
85 | ||
86 | numslots = (master->erasesize / sizeof(struct fis_image_desc)); | |
87 | for (i = 0; i < numslots; i++) { | |
9cff3372 JB |
88 | if (!memcmp(buf[i].name, "FIS directory", 14)) { |
89 | /* This is apparently the FIS directory entry for the | |
90 | * FIS directory itself. The FIS directory size is | |
77a33135 | 91 | * one erase block; if the buf[i].size field is |
9cff3372 JB |
92 | * swab32(erasesize) then we know we are looking at |
93 | * a byte swapped FIS directory - swap all the entries! | |
77a33135 | 94 | * (NOTE: this is 'size' not 'data_length'; size is |
9cff3372 JB |
95 | * the full size of the entry.) |
96 | */ | |
97 | if (swab32(buf[i].size) == master->erasesize) { | |
98 | int j; | |
99 | for (j = 0; j < numslots && buf[j].name[0] != 0xff; ++j) { | |
100 | /* The unsigned long fields were written with the | |
101 | * wrong byte sex, name and pad have no byte sex. | |
102 | */ | |
77a33135 JB |
103 | swab32s(&buf[j].flash_base); |
104 | swab32s(&buf[j].mem_base); | |
105 | swab32s(&buf[j].size); | |
106 | swab32s(&buf[j].entry_point); | |
107 | swab32s(&buf[j].data_length); | |
108 | swab32s(&buf[j].desc_cksum); | |
109 | swab32s(&buf[j].file_cksum); | |
9cff3372 JB |
110 | } |
111 | } | |
1da177e4 | 112 | break; |
9cff3372 | 113 | } |
1da177e4 LT |
114 | } |
115 | if (i == numslots) { | |
116 | /* Didn't find it */ | |
117 | printk(KERN_NOTICE "No RedBoot partition table detected in %s\n", | |
118 | master->name); | |
119 | ret = 0; | |
120 | goto out; | |
121 | } | |
122 | ||
123 | for (i = 0; i < numslots; i++) { | |
124 | struct fis_list *new_fl, **prev; | |
125 | ||
126 | if (buf[i].name[0] == 0xff) | |
84e699e6 | 127 | continue; |
1da177e4 LT |
128 | if (!redboot_checksum(&buf[i])) |
129 | break; | |
130 | ||
131 | new_fl = kmalloc(sizeof(struct fis_list), GFP_KERNEL); | |
132 | namelen += strlen(buf[i].name)+1; | |
133 | if (!new_fl) { | |
134 | ret = -ENOMEM; | |
135 | goto out; | |
136 | } | |
137 | new_fl->img = &buf[i]; | |
138 | if (fis_origin) { | |
139 | buf[i].flash_base -= fis_origin; | |
140 | } else { | |
141 | buf[i].flash_base &= master->size-1; | |
142 | } | |
143 | ||
144 | /* I'm sure the JFFS2 code has done me permanent damage. | |
145 | * I now think the following is _normal_ | |
146 | */ | |
147 | prev = &fl; | |
148 | while(*prev && (*prev)->img->flash_base < new_fl->img->flash_base) | |
149 | prev = &(*prev)->next; | |
150 | new_fl->next = *prev; | |
151 | *prev = new_fl; | |
152 | ||
153 | nrparts++; | |
154 | } | |
155 | #ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED | |
156 | if (fl->img->flash_base) { | |
157 | nrparts++; | |
158 | nulllen = sizeof(nullstring); | |
159 | } | |
160 | ||
161 | for (tmp_fl = fl; tmp_fl->next; tmp_fl = tmp_fl->next) { | |
162 | if (tmp_fl->img->flash_base + tmp_fl->img->size + master->erasesize <= tmp_fl->next->img->flash_base) { | |
163 | nrparts++; | |
164 | nulllen = sizeof(nullstring); | |
165 | } | |
166 | } | |
167 | #endif | |
168 | parts = kmalloc(sizeof(*parts)*nrparts + nulllen + namelen, GFP_KERNEL); | |
169 | ||
170 | if (!parts) { | |
171 | ret = -ENOMEM; | |
172 | goto out; | |
173 | } | |
174 | ||
175 | memset(parts, 0, sizeof(*parts)*nrparts + nulllen + namelen); | |
176 | ||
177 | nullname = (char *)&parts[nrparts]; | |
178 | #ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED | |
179 | if (nulllen > 0) { | |
180 | strcpy(nullname, nullstring); | |
181 | } | |
182 | #endif | |
183 | names = nullname + nulllen; | |
184 | ||
185 | i=0; | |
186 | ||
187 | #ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED | |
188 | if (fl->img->flash_base) { | |
189 | parts[0].name = nullname; | |
190 | parts[0].size = fl->img->flash_base; | |
191 | parts[0].offset = 0; | |
192 | i++; | |
193 | } | |
194 | #endif | |
195 | for ( ; i<nrparts; i++) { | |
196 | parts[i].size = fl->img->size; | |
197 | parts[i].offset = fl->img->flash_base; | |
198 | parts[i].name = names; | |
199 | ||
200 | strcpy(names, fl->img->name); | |
201 | #ifdef CONFIG_MTD_REDBOOT_PARTS_READONLY | |
202 | if (!memcmp(names, "RedBoot", 8) || | |
203 | !memcmp(names, "RedBoot config", 15) || | |
204 | !memcmp(names, "FIS directory", 14)) { | |
205 | parts[i].mask_flags = MTD_WRITEABLE; | |
206 | } | |
207 | #endif | |
208 | names += strlen(names)+1; | |
209 | ||
210 | #ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED | |
211 | if(fl->next && fl->img->flash_base + fl->img->size + master->erasesize <= fl->next->img->flash_base) { | |
212 | i++; | |
213 | parts[i].offset = parts[i-1].size + parts[i-1].offset; | |
214 | parts[i].size = fl->next->img->flash_base - parts[i].offset; | |
215 | parts[i].name = nullname; | |
216 | } | |
217 | #endif | |
218 | tmp_fl = fl; | |
219 | fl = fl->next; | |
220 | kfree(tmp_fl); | |
221 | } | |
222 | ret = nrparts; | |
223 | *pparts = parts; | |
224 | out: | |
225 | while (fl) { | |
226 | struct fis_list *old = fl; | |
227 | fl = fl->next; | |
228 | kfree(old); | |
229 | } | |
230 | vfree(buf); | |
231 | return ret; | |
232 | } | |
233 | ||
234 | static struct mtd_part_parser redboot_parser = { | |
235 | .owner = THIS_MODULE, | |
236 | .parse_fn = parse_redboot_partitions, | |
237 | .name = "RedBoot", | |
238 | }; | |
239 | ||
240 | static int __init redboot_parser_init(void) | |
241 | { | |
242 | return register_mtd_parser(&redboot_parser); | |
243 | } | |
244 | ||
245 | static void __exit redboot_parser_exit(void) | |
246 | { | |
247 | deregister_mtd_parser(&redboot_parser); | |
248 | } | |
249 | ||
250 | module_init(redboot_parser_init); | |
251 | module_exit(redboot_parser_exit); | |
252 | ||
253 | MODULE_LICENSE("GPL"); | |
254 | MODULE_AUTHOR("Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>"); | |
255 | MODULE_DESCRIPTION("Parsing code for RedBoot Flash Image System (FIS) tables"); |