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Piotr Wilczek8b096232012-12-11 11:09:47 +01001/*
2 * cmd_gpt.c -- GPT (GUID Partition Table) handling command
3 *
Lukasz Majewskibbb9ffa2015-11-20 08:06:17 +01004 * Copyright (C) 2015
5 * Lukasz Majewski <l.majewski@majess.pl>
6 *
Piotr Wilczek8b096232012-12-11 11:09:47 +01007 * Copyright (C) 2012 Samsung Electronics
8 * author: Lukasz Majewski <l.majewski@samsung.com>
9 * author: Piotr Wilczek <p.wilczek@samsung.com>
10 *
Wolfgang Denk1a459662013-07-08 09:37:19 +020011 * SPDX-License-Identifier: GPL-2.0+
Piotr Wilczek8b096232012-12-11 11:09:47 +010012 */
13
14#include <common.h>
15#include <malloc.h>
16#include <command.h>
Piotr Wilczek8b096232012-12-11 11:09:47 +010017#include <part_efi.h>
18#include <exports.h>
19#include <linux/ctype.h>
Piotr Wilczek3e34cf72013-01-27 22:59:25 +000020#include <div64.h>
Lukasz Majewskibbb9ffa2015-11-20 08:06:17 +010021#include <memalign.h>
Piotr Wilczek8b096232012-12-11 11:09:47 +010022
23#ifndef CONFIG_PARTITION_UUIDS
24#error CONFIG_PARTITION_UUIDS must be enabled for CONFIG_CMD_GPT to be enabled
25#endif
26
27/**
28 * extract_env(): Expand env name from string format '&{env_name}'
29 * and return pointer to the env (if the env is set)
30 *
31 * @param str - pointer to string
32 * @param env - pointer to pointer to extracted env
33 *
34 * @return - zero on successful expand and env is set
35 */
Przemyslaw Marczak39206382014-04-02 10:20:06 +020036static int extract_env(const char *str, char **env)
Piotr Wilczek8b096232012-12-11 11:09:47 +010037{
Przemyslaw Marczak39206382014-04-02 10:20:06 +020038 int ret = -1;
Piotr Wilczek8b096232012-12-11 11:09:47 +010039 char *e, *s;
Przemyslaw Marczak39206382014-04-02 10:20:06 +020040#ifdef CONFIG_RANDOM_UUID
41 char uuid_str[UUID_STR_LEN + 1];
42#endif
Piotr Wilczek8b096232012-12-11 11:09:47 +010043
44 if (!str || strlen(str) < 4)
45 return -1;
46
Przemyslaw Marczak39206382014-04-02 10:20:06 +020047 if (!((strncmp(str, "${", 2) == 0) && (str[strlen(str) - 1] == '}')))
48 return -1;
49
50 s = strdup(str);
51 if (s == NULL)
52 return -1;
53
54 memset(s + strlen(s) - 1, '\0', 1);
55 memmove(s, s + 2, strlen(s) - 1);
56
57 e = getenv(s);
58 if (e == NULL) {
59#ifdef CONFIG_RANDOM_UUID
60 debug("%s unset. ", str);
61 gen_rand_uuid_str(uuid_str, UUID_STR_FORMAT_STD);
62 setenv(s, uuid_str);
63
Piotr Wilczek8b096232012-12-11 11:09:47 +010064 e = getenv(s);
Przemyslaw Marczak39206382014-04-02 10:20:06 +020065 if (e) {
66 debug("Set to random.\n");
67 ret = 0;
68 } else {
69 debug("Can't get random UUID.\n");
Piotr Wilczek8b096232012-12-11 11:09:47 +010070 }
Przemyslaw Marczak39206382014-04-02 10:20:06 +020071#else
72 debug("%s unset.\n", str);
73#endif
74 } else {
75 debug("%s get from environment.\n", str);
76 ret = 0;
Piotr Wilczek8b096232012-12-11 11:09:47 +010077 }
78
Przemyslaw Marczak39206382014-04-02 10:20:06 +020079 *env = e;
80 free(s);
81
82 return ret;
Piotr Wilczek8b096232012-12-11 11:09:47 +010083}
84
85/**
86 * extract_val(): Extract value from a key=value pair list (comma separated).
87 * Only value for the given key is returend.
88 * Function allocates memory for the value, remember to free!
89 *
90 * @param str - pointer to string with key=values pairs
91 * @param key - pointer to the key to search for
92 *
93 * @return - pointer to allocated string with the value
94 */
95static char *extract_val(const char *str, const char *key)
96{
97 char *v, *k;
98 char *s, *strcopy;
99 char *new = NULL;
100
101 strcopy = strdup(str);
102 if (strcopy == NULL)
103 return NULL;
104
105 s = strcopy;
106 while (s) {
107 v = strsep(&s, ",");
108 if (!v)
109 break;
110 k = strsep(&v, "=");
111 if (!k)
112 break;
113 if (strcmp(k, key) == 0) {
114 new = strdup(v);
115 break;
116 }
117 }
118
119 free(strcopy);
120
121 return new;
122}
123
124/**
Patrick Delaunaycfdaf4c2015-11-17 11:36:52 +0100125 * found_key(): Found key without value in parameter list (comma separated).
126 *
127 * @param str - pointer to string with key
128 * @param key - pointer to the key to search for
129 *
130 * @return - true on found key
131 */
132static bool found_key(const char *str, const char *key)
133{
134 char *k;
135 char *s, *strcopy;
136 bool result = false;
137
138 strcopy = strdup(str);
139 if (!strcopy)
140 return NULL;
141
142 s = strcopy;
143 while (s) {
144 k = strsep(&s, ",");
145 if (!k)
146 break;
147 if (strcmp(k, key) == 0) {
148 result = true;
149 break;
150 }
151 }
152
153 free(strcopy);
154
155 return result;
156}
157
158/**
Piotr Wilczek8b096232012-12-11 11:09:47 +0100159 * set_gpt_info(): Fill partition information from string
160 * function allocates memory, remember to free!
161 *
162 * @param dev_desc - pointer block device descriptor
163 * @param str_part - pointer to string with partition information
164 * @param str_disk_guid - pointer to pointer to allocated string with disk guid
165 * @param partitions - pointer to pointer to allocated partitions array
166 * @param parts_count - number of partitions
167 *
168 * @return - zero on success, otherwise error
169 *
170 */
Simon Glass4101f682016-02-29 15:25:34 -0700171static int set_gpt_info(struct blk_desc *dev_desc,
Piotr Wilczek8b096232012-12-11 11:09:47 +0100172 const char *str_part,
173 char **str_disk_guid,
174 disk_partition_t **partitions,
175 u8 *parts_count)
176{
177 char *tok, *str, *s;
178 int i;
179 char *val, *p;
180 int p_count;
181 disk_partition_t *parts;
182 int errno = 0;
Piotr Wilczek3e34cf72013-01-27 22:59:25 +0000183 uint64_t size_ll, start_ll;
Michael Trimarchi6663623562016-06-08 10:18:16 +0200184 lbaint_t offset = 0;
Piotr Wilczek8b096232012-12-11 11:09:47 +0100185
Egbert Eich619f0fd2013-10-04 18:53:04 +0200186 debug("%s: lba num: 0x%x %d\n", __func__,
Piotr Wilczek8b096232012-12-11 11:09:47 +0100187 (unsigned int)dev_desc->lba, (unsigned int)dev_desc->lba);
188
189 if (str_part == NULL)
190 return -1;
191
192 str = strdup(str_part);
193
194 /* extract disk guid */
195 s = str;
Rob Herring0c7e8d12015-01-26 09:44:18 -0600196 val = extract_val(str, "uuid_disk");
Piotr Wilczek8b096232012-12-11 11:09:47 +0100197 if (!val) {
Rob Herring0c7e8d12015-01-26 09:44:18 -0600198#ifdef CONFIG_RANDOM_UUID
199 *str_disk_guid = malloc(UUID_STR_LEN + 1);
200 gen_rand_uuid_str(*str_disk_guid, UUID_STR_FORMAT_STD);
201#else
Piotr Wilczek8b096232012-12-11 11:09:47 +0100202 free(str);
203 return -2;
Rob Herring0c7e8d12015-01-26 09:44:18 -0600204#endif
205 } else {
206 val = strsep(&val, ";");
207 if (extract_env(val, &p))
208 p = val;
209 *str_disk_guid = strdup(p);
210 free(val);
211 /* Move s to first partition */
212 strsep(&s, ";");
Piotr Wilczek8b096232012-12-11 11:09:47 +0100213 }
Piotr Wilczek8b096232012-12-11 11:09:47 +0100214 if (strlen(s) == 0)
215 return -3;
216
217 i = strlen(s) - 1;
218 if (s[i] == ';')
219 s[i] = '\0';
220
221 /* calculate expected number of partitions */
222 p_count = 1;
223 p = s;
224 while (*p) {
225 if (*p++ == ';')
226 p_count++;
227 }
228
229 /* allocate memory for partitions */
230 parts = calloc(sizeof(disk_partition_t), p_count);
231
Robert P. J. Day1f8b5462013-08-21 11:39:19 -0400232 /* retrieve partitions data from string */
Piotr Wilczek8b096232012-12-11 11:09:47 +0100233 for (i = 0; i < p_count; i++) {
234 tok = strsep(&s, ";");
235
236 if (tok == NULL)
237 break;
238
239 /* uuid */
240 val = extract_val(tok, "uuid");
Rob Herring0c7e8d12015-01-26 09:44:18 -0600241 if (!val) {
242 /* 'uuid' is optional if random uuid's are enabled */
243#ifdef CONFIG_RANDOM_UUID
244 gen_rand_uuid_str(parts[i].uuid, UUID_STR_FORMAT_STD);
245#else
Piotr Wilczek8b096232012-12-11 11:09:47 +0100246 errno = -4;
247 goto err;
Rob Herring0c7e8d12015-01-26 09:44:18 -0600248#endif
249 } else {
250 if (extract_env(val, &p))
251 p = val;
252 if (strlen(p) >= sizeof(parts[i].uuid)) {
253 printf("Wrong uuid format for partition %d\n", i);
254 errno = -4;
255 goto err;
256 }
257 strcpy((char *)parts[i].uuid, p);
258 free(val);
Piotr Wilczek8b096232012-12-11 11:09:47 +0100259 }
Patrick Delaunay7561b252015-10-27 11:00:27 +0100260#ifdef CONFIG_PARTITION_TYPE_GUID
261 /* guid */
262 val = extract_val(tok, "type");
263 if (val) {
264 /* 'type' is optional */
265 if (extract_env(val, &p))
266 p = val;
267 if (strlen(p) >= sizeof(parts[i].type_guid)) {
268 printf("Wrong type guid format for partition %d\n",
269 i);
270 errno = -4;
271 goto err;
272 }
273 strcpy((char *)parts[i].type_guid, p);
274 free(val);
275 }
276#endif
Piotr Wilczek8b096232012-12-11 11:09:47 +0100277 /* name */
278 val = extract_val(tok, "name");
279 if (!val) { /* name is mandatory */
280 errno = -4;
281 goto err;
282 }
283 if (extract_env(val, &p))
284 p = val;
285 if (strlen(p) >= sizeof(parts[i].name)) {
286 errno = -4;
287 goto err;
288 }
289 strcpy((char *)parts[i].name, p);
290 free(val);
291
292 /* size */
293 val = extract_val(tok, "size");
294 if (!val) { /* 'size' is mandatory */
295 errno = -4;
296 goto err;
297 }
298 if (extract_env(val, &p))
299 p = val;
Michael Trimarchi6663623562016-06-08 10:18:16 +0200300 if ((strcmp(p, "-") == 0)) {
301 /* remove first usable lba and last block */
302 parts[i].size = dev_desc->lba - 34 - 1 - offset;
303 } else {
304 size_ll = ustrtoull(p, &p, 0);
305 parts[i].size = lldiv(size_ll, dev_desc->blksz);
306 }
307
Piotr Wilczek8b096232012-12-11 11:09:47 +0100308 free(val);
309
310 /* start address */
311 val = extract_val(tok, "start");
312 if (val) { /* start address is optional */
313 if (extract_env(val, &p))
314 p = val;
Piotr Wilczek3e34cf72013-01-27 22:59:25 +0000315 start_ll = ustrtoull(p, &p, 0);
316 parts[i].start = lldiv(start_ll, dev_desc->blksz);
Piotr Wilczek8b096232012-12-11 11:09:47 +0100317 free(val);
318 }
Patrick Delaunaycfdaf4c2015-11-17 11:36:52 +0100319
Michael Trimarchi6663623562016-06-08 10:18:16 +0200320 offset += parts[i].size + parts[i].start;
321
Patrick Delaunaycfdaf4c2015-11-17 11:36:52 +0100322 /* bootable */
323 if (found_key(tok, "bootable"))
324 parts[i].bootable = 1;
Piotr Wilczek8b096232012-12-11 11:09:47 +0100325 }
326
327 *parts_count = p_count;
328 *partitions = parts;
329 free(str);
330
331 return 0;
332err:
333 free(str);
334 free(*str_disk_guid);
335 free(parts);
336
337 return errno;
338}
339
Simon Glass4101f682016-02-29 15:25:34 -0700340static int gpt_default(struct blk_desc *blk_dev_desc, const char *str_part)
Piotr Wilczek8b096232012-12-11 11:09:47 +0100341{
342 int ret;
343 char *str_disk_guid;
344 u8 part_count = 0;
345 disk_partition_t *partitions = NULL;
346
Piotr Wilczek8b096232012-12-11 11:09:47 +0100347 /* fill partitions */
Egbert Eich619f0fd2013-10-04 18:53:04 +0200348 ret = set_gpt_info(blk_dev_desc, str_part,
Piotr Wilczek8b096232012-12-11 11:09:47 +0100349 &str_disk_guid, &partitions, &part_count);
350 if (ret) {
351 if (ret == -1)
352 printf("No partition list provided\n");
353 if (ret == -2)
354 printf("Missing disk guid\n");
355 if ((ret == -3) || (ret == -4))
356 printf("Partition list incomplete\n");
357 return -1;
358 }
359
360 /* save partitions layout to disk */
Rob Herringa150e6c2015-01-26 09:43:15 -0600361 ret = gpt_restore(blk_dev_desc, str_disk_guid, partitions, part_count);
Piotr Wilczek8b096232012-12-11 11:09:47 +0100362 free(str_disk_guid);
363 free(partitions);
364
Rob Herringa150e6c2015-01-26 09:43:15 -0600365 return ret;
Piotr Wilczek8b096232012-12-11 11:09:47 +0100366}
367
Simon Glass4101f682016-02-29 15:25:34 -0700368static int gpt_verify(struct blk_desc *blk_dev_desc, const char *str_part)
Lukasz Majewskibbb9ffa2015-11-20 08:06:17 +0100369{
370 ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1,
371 blk_dev_desc->blksz);
372 disk_partition_t *partitions = NULL;
373 gpt_entry *gpt_pte = NULL;
374 char *str_disk_guid;
375 u8 part_count = 0;
376 int ret = 0;
377
378 /* fill partitions */
379 ret = set_gpt_info(blk_dev_desc, str_part,
380 &str_disk_guid, &partitions, &part_count);
381 if (ret) {
382 if (ret == -1) {
383 printf("No partition list provided - only basic check\n");
384 ret = gpt_verify_headers(blk_dev_desc, gpt_head,
385 &gpt_pte);
386 goto out;
387 }
388 if (ret == -2)
389 printf("Missing disk guid\n");
390 if ((ret == -3) || (ret == -4))
391 printf("Partition list incomplete\n");
392 return -1;
393 }
394
395 /* Check partition layout with provided pattern */
396 ret = gpt_verify_partitions(blk_dev_desc, partitions, part_count,
397 gpt_head, &gpt_pte);
398 free(str_disk_guid);
399 free(partitions);
400 out:
401 free(gpt_pte);
402 return ret;
403}
404
Piotr Wilczek8b096232012-12-11 11:09:47 +0100405/**
406 * do_gpt(): Perform GPT operations
407 *
408 * @param cmdtp - command name
409 * @param flag
410 * @param argc
411 * @param argv
412 *
413 * @return zero on success; otherwise error
414 */
415static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
416{
417 int ret = CMD_RET_SUCCESS;
418 int dev = 0;
Egbert Eich619f0fd2013-10-04 18:53:04 +0200419 char *ep;
Simon Glass4101f682016-02-29 15:25:34 -0700420 struct blk_desc *blk_dev_desc = NULL;
Piotr Wilczek8b096232012-12-11 11:09:47 +0100421
Lukasz Majewskibbb9ffa2015-11-20 08:06:17 +0100422 if (argc < 4 || argc > 5)
Piotr Wilczek8b096232012-12-11 11:09:47 +0100423 return CMD_RET_USAGE;
424
Lukasz Majewskibbb9ffa2015-11-20 08:06:17 +0100425 dev = (int)simple_strtoul(argv[3], &ep, 10);
426 if (!ep || ep[0] != '\0') {
427 printf("'%s' is not a number\n", argv[3]);
428 return CMD_RET_USAGE;
429 }
Simon Glassdb1d9e72016-02-29 15:25:42 -0700430 blk_dev_desc = blk_get_dev(argv[2], dev);
Lukasz Majewskibbb9ffa2015-11-20 08:06:17 +0100431 if (!blk_dev_desc) {
432 printf("%s: %s dev %d NOT available\n",
433 __func__, argv[2], dev);
434 return CMD_RET_FAILURE;
435 }
436
Piotr Wilczek8b096232012-12-11 11:09:47 +0100437 if ((strcmp(argv[1], "write") == 0) && (argc == 5)) {
Lukasz Majewskibbb9ffa2015-11-20 08:06:17 +0100438 printf("Writing GPT: ");
Przemyslaw Marczak39206382014-04-02 10:20:06 +0200439 ret = gpt_default(blk_dev_desc, argv[4]);
Lukasz Majewskibbb9ffa2015-11-20 08:06:17 +0100440 } else if ((strcmp(argv[1], "verify") == 0)) {
441 ret = gpt_verify(blk_dev_desc, argv[4]);
442 printf("Verify GPT: ");
Piotr Wilczek8b096232012-12-11 11:09:47 +0100443 } else {
444 return CMD_RET_USAGE;
445 }
Lukasz Majewskibbb9ffa2015-11-20 08:06:17 +0100446
447 if (ret) {
448 printf("error!\n");
449 return CMD_RET_FAILURE;
450 }
451
452 printf("success!\n");
453 return CMD_RET_SUCCESS;
Piotr Wilczek8b096232012-12-11 11:09:47 +0100454}
455
456U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
457 "GUID Partition Table",
Robert P. J. Day1f8b5462013-08-21 11:39:19 -0400458 "<command> <interface> <dev> <partitions_list>\n"
Lukasz Majewski74f889b2015-11-13 07:42:10 +0100459 " - GUID partition table restoration and validity check\n"
460 " Restore or verify GPT information on a device connected\n"
Piotr Wilczek8b096232012-12-11 11:09:47 +0100461 " to interface\n"
Lukasz Majewski74f889b2015-11-13 07:42:10 +0100462 " Example usage:\n"
463 " gpt write mmc 0 $partitions\n"
464 " gpt verify mmc 0 $partitions\n"
Piotr Wilczek8b096232012-12-11 11:09:47 +0100465);