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1da177e4 | 1 | /* |
b020bb7d | 2 | * $Id: redboot.c,v 1.21 2006/03/30 18:34:37 bjd 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 | |
b020bb7d BD |
18 | uint32_t flash_base; // Address within FLASH of image |
19 | uint32_t mem_base; // Address in memory where it executes | |
20 | uint32_t size; // Length of image | |
21 | uint32_t entry_point; // Execution entry point | |
22 | uint32_t data_length; // Length of actual data | |
23 | unsigned char _pad[256-(16+7*sizeof(uint32_t))]; | |
24 | uint32_t desc_cksum; // Checksum over image descriptor | |
25 | uint32_t file_cksum; // Checksum over image data | |
1da177e4 LT |
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 | ||
3c441baa DW |
62 | if ( directory < 0 ) { |
63 | offset = master->size + directory * master->erasesize; | |
64 | while (master->block_isbad && | |
65 | master->block_isbad(master, offset)) { | |
66 | if (!offset) { | |
67 | nogood: | |
68 | printk(KERN_NOTICE "Failed to find a non-bad block to check for RedBoot partition table\n"); | |
69 | return -EIO; | |
70 | } | |
71 | offset -= master->erasesize; | |
72 | } | |
73 | } else { | |
74 | offset = directory * master->erasesize; | |
75 | while (master->block_isbad && | |
76 | master->block_isbad(master, offset)) { | |
77 | offset += master->erasesize; | |
78 | if (offset == master->size) | |
79 | goto nogood; | |
80 | } | |
81 | } | |
1da177e4 LT |
82 | buf = vmalloc(master->erasesize); |
83 | ||
84 | if (!buf) | |
85 | return -ENOMEM; | |
86 | ||
1da177e4 LT |
87 | printk(KERN_NOTICE "Searching for RedBoot partition table in %s at offset 0x%lx\n", |
88 | master->name, offset); | |
89 | ||
90 | ret = master->read(master, offset, | |
91 | master->erasesize, &retlen, (void *)buf); | |
92 | ||
93 | if (ret) | |
94 | goto out; | |
95 | ||
96 | if (retlen != master->erasesize) { | |
97 | ret = -EIO; | |
98 | goto out; | |
99 | } | |
100 | ||
101 | numslots = (master->erasesize / sizeof(struct fis_image_desc)); | |
102 | for (i = 0; i < numslots; i++) { | |
9cff3372 JB |
103 | if (!memcmp(buf[i].name, "FIS directory", 14)) { |
104 | /* This is apparently the FIS directory entry for the | |
105 | * FIS directory itself. The FIS directory size is | |
77a33135 | 106 | * one erase block; if the buf[i].size field is |
9cff3372 JB |
107 | * swab32(erasesize) then we know we are looking at |
108 | * a byte swapped FIS directory - swap all the entries! | |
77a33135 | 109 | * (NOTE: this is 'size' not 'data_length'; size is |
9cff3372 JB |
110 | * the full size of the entry.) |
111 | */ | |
7ca353a4 DW |
112 | |
113 | /* RedBoot can combine the FIS directory and | |
114 | config partitions into a single eraseblock; | |
115 | we assume wrong-endian if either the swapped | |
116 | 'size' matches the eraseblock size precisely, | |
117 | or if the swapped size actually fits in an | |
118 | eraseblock while the unswapped size doesn't. */ | |
119 | if (swab32(buf[i].size) == master->erasesize || | |
120 | (buf[i].size > master->erasesize | |
121 | && swab32(buf[i].size) < master->erasesize)) { | |
9cff3372 | 122 | int j; |
11192146 RW |
123 | /* Update numslots based on actual FIS directory size */ |
124 | numslots = swab32(buf[i].size) / sizeof (struct fis_image_desc); | |
f33665d9 RW |
125 | for (j = 0; j < numslots; ++j) { |
126 | ||
127 | /* A single 0xff denotes a deleted entry. | |
128 | * Two of them in a row is the end of the table. | |
129 | */ | |
130 | if (buf[j].name[0] == 0xff) { | |
131 | if (buf[j].name[1] == 0xff) { | |
132 | break; | |
133 | } else { | |
134 | continue; | |
135 | } | |
136 | } | |
137 | ||
9cff3372 JB |
138 | /* The unsigned long fields were written with the |
139 | * wrong byte sex, name and pad have no byte sex. | |
140 | */ | |
77a33135 JB |
141 | swab32s(&buf[j].flash_base); |
142 | swab32s(&buf[j].mem_base); | |
143 | swab32s(&buf[j].size); | |
144 | swab32s(&buf[j].entry_point); | |
145 | swab32s(&buf[j].data_length); | |
146 | swab32s(&buf[j].desc_cksum); | |
147 | swab32s(&buf[j].file_cksum); | |
9cff3372 | 148 | } |
7ca353a4 | 149 | } else if (buf[i].size < master->erasesize) { |
11192146 RW |
150 | /* Update numslots based on actual FIS directory size */ |
151 | numslots = buf[i].size / sizeof(struct fis_image_desc); | |
9cff3372 | 152 | } |
1da177e4 | 153 | break; |
9cff3372 | 154 | } |
1da177e4 LT |
155 | } |
156 | if (i == numslots) { | |
157 | /* Didn't find it */ | |
158 | printk(KERN_NOTICE "No RedBoot partition table detected in %s\n", | |
159 | master->name); | |
160 | ret = 0; | |
161 | goto out; | |
162 | } | |
163 | ||
164 | for (i = 0; i < numslots; i++) { | |
165 | struct fis_list *new_fl, **prev; | |
166 | ||
f33665d9 RW |
167 | if (buf[i].name[0] == 0xff) { |
168 | if (buf[i].name[1] == 0xff) { | |
169 | break; | |
170 | } else { | |
171 | continue; | |
172 | } | |
173 | } | |
1da177e4 LT |
174 | if (!redboot_checksum(&buf[i])) |
175 | break; | |
176 | ||
177 | new_fl = kmalloc(sizeof(struct fis_list), GFP_KERNEL); | |
178 | namelen += strlen(buf[i].name)+1; | |
179 | if (!new_fl) { | |
180 | ret = -ENOMEM; | |
181 | goto out; | |
182 | } | |
183 | new_fl->img = &buf[i]; | |
184 | if (fis_origin) { | |
185 | buf[i].flash_base -= fis_origin; | |
186 | } else { | |
187 | buf[i].flash_base &= master->size-1; | |
188 | } | |
189 | ||
190 | /* I'm sure the JFFS2 code has done me permanent damage. | |
191 | * I now think the following is _normal_ | |
192 | */ | |
193 | prev = &fl; | |
194 | while(*prev && (*prev)->img->flash_base < new_fl->img->flash_base) | |
195 | prev = &(*prev)->next; | |
196 | new_fl->next = *prev; | |
197 | *prev = new_fl; | |
198 | ||
199 | nrparts++; | |
200 | } | |
201 | #ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED | |
202 | if (fl->img->flash_base) { | |
203 | nrparts++; | |
204 | nulllen = sizeof(nullstring); | |
205 | } | |
206 | ||
207 | for (tmp_fl = fl; tmp_fl->next; tmp_fl = tmp_fl->next) { | |
208 | if (tmp_fl->img->flash_base + tmp_fl->img->size + master->erasesize <= tmp_fl->next->img->flash_base) { | |
209 | nrparts++; | |
210 | nulllen = sizeof(nullstring); | |
211 | } | |
212 | } | |
213 | #endif | |
95b93a0c | 214 | parts = kzalloc(sizeof(*parts)*nrparts + nulllen + namelen, GFP_KERNEL); |
1da177e4 LT |
215 | |
216 | if (!parts) { | |
217 | ret = -ENOMEM; | |
218 | goto out; | |
219 | } | |
220 | ||
1da177e4 LT |
221 | nullname = (char *)&parts[nrparts]; |
222 | #ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED | |
223 | if (nulllen > 0) { | |
224 | strcpy(nullname, nullstring); | |
225 | } | |
226 | #endif | |
227 | names = nullname + nulllen; | |
228 | ||
229 | i=0; | |
230 | ||
231 | #ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED | |
232 | if (fl->img->flash_base) { | |
233 | parts[0].name = nullname; | |
234 | parts[0].size = fl->img->flash_base; | |
235 | parts[0].offset = 0; | |
236 | i++; | |
237 | } | |
238 | #endif | |
239 | for ( ; i<nrparts; i++) { | |
240 | parts[i].size = fl->img->size; | |
241 | parts[i].offset = fl->img->flash_base; | |
242 | parts[i].name = names; | |
243 | ||
244 | strcpy(names, fl->img->name); | |
245 | #ifdef CONFIG_MTD_REDBOOT_PARTS_READONLY | |
246 | if (!memcmp(names, "RedBoot", 8) || | |
247 | !memcmp(names, "RedBoot config", 15) || | |
248 | !memcmp(names, "FIS directory", 14)) { | |
249 | parts[i].mask_flags = MTD_WRITEABLE; | |
250 | } | |
251 | #endif | |
252 | names += strlen(names)+1; | |
253 | ||
254 | #ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED | |
255 | if(fl->next && fl->img->flash_base + fl->img->size + master->erasesize <= fl->next->img->flash_base) { | |
256 | i++; | |
257 | parts[i].offset = parts[i-1].size + parts[i-1].offset; | |
258 | parts[i].size = fl->next->img->flash_base - parts[i].offset; | |
259 | parts[i].name = nullname; | |
260 | } | |
261 | #endif | |
262 | tmp_fl = fl; | |
263 | fl = fl->next; | |
264 | kfree(tmp_fl); | |
265 | } | |
266 | ret = nrparts; | |
267 | *pparts = parts; | |
268 | out: | |
269 | while (fl) { | |
270 | struct fis_list *old = fl; | |
271 | fl = fl->next; | |
272 | kfree(old); | |
273 | } | |
274 | vfree(buf); | |
275 | return ret; | |
276 | } | |
277 | ||
278 | static struct mtd_part_parser redboot_parser = { | |
279 | .owner = THIS_MODULE, | |
280 | .parse_fn = parse_redboot_partitions, | |
281 | .name = "RedBoot", | |
282 | }; | |
283 | ||
284 | static int __init redboot_parser_init(void) | |
285 | { | |
286 | return register_mtd_parser(&redboot_parser); | |
287 | } | |
288 | ||
289 | static void __exit redboot_parser_exit(void) | |
290 | { | |
291 | deregister_mtd_parser(&redboot_parser); | |
292 | } | |
293 | ||
294 | module_init(redboot_parser_init); | |
295 | module_exit(redboot_parser_exit); | |
296 | ||
297 | MODULE_LICENSE("GPL"); | |
298 | MODULE_AUTHOR("Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>"); | |
299 | MODULE_DESCRIPTION("Parsing code for RedBoot Flash Image System (FIS) tables"); |