2 * cmd_gpt.c -- GPT (GUID Partition Table) handling command
5 * Lukasz Majewski <l.majewski@majess.pl>
7 * Copyright (C) 2012 Samsung Electronics
8 * author: Lukasz Majewski <l.majewski@samsung.com>
9 * author: Piotr Wilczek <p.wilczek@samsung.com>
11 * SPDX-License-Identifier: GPL-2.0+
19 #include <linux/ctype.h>
23 #ifndef CONFIG_PARTITION_UUIDS
24 #error CONFIG_PARTITION_UUIDS must be enabled for CONFIG_CMD_GPT to be enabled
28 * extract_env(): Expand env name from string format '&{env_name}'
29 * and return pointer to the env (if the env is set)
31 * @param str - pointer to string
32 * @param env - pointer to pointer to extracted env
34 * @return - zero on successful expand and env is set
36 static int extract_env(const char *str, char **env)
40 #ifdef CONFIG_RANDOM_UUID
41 char uuid_str[UUID_STR_LEN + 1];
44 if (!str || strlen(str) < 4)
47 if (!((strncmp(str, "${", 2) == 0) && (str[strlen(str) - 1] == '}')))
54 memset(s + strlen(s) - 1, '\0', 1);
55 memmove(s, s + 2, strlen(s) - 1);
59 #ifdef CONFIG_RANDOM_UUID
60 debug("%s unset. ", str);
61 gen_rand_uuid_str(uuid_str, UUID_STR_FORMAT_STD);
66 debug("Set to random.\n");
69 debug("Can't get random UUID.\n");
72 debug("%s unset.\n", str);
75 debug("%s get from environment.\n", str);
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!
90 * @param str - pointer to string with key=values pairs
91 * @param key - pointer to the key to search for
93 * @return - pointer to allocated string with the value
95 static char *extract_val(const char *str, const char *key)
101 strcopy = strdup(str);
113 if (strcmp(k, key) == 0) {
125 * found_key(): Found key without value in parameter list (comma separated).
127 * @param str - pointer to string with key
128 * @param key - pointer to the key to search for
130 * @return - true on found key
132 static bool found_key(const char *str, const char *key)
138 strcopy = strdup(str);
147 if (strcmp(k, key) == 0) {
159 * set_gpt_info(): Fill partition information from string
160 * function allocates memory, remember to free!
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
168 * @return - zero on success, otherwise error
171 static int set_gpt_info(struct blk_desc *dev_desc,
172 const char *str_part,
173 char **str_disk_guid,
174 disk_partition_t **partitions,
181 disk_partition_t *parts;
183 uint64_t size_ll, start_ll;
186 debug("%s: lba num: 0x%x %d\n", __func__,
187 (unsigned int)dev_desc->lba, (unsigned int)dev_desc->lba);
189 if (str_part == NULL)
192 str = strdup(str_part);
194 /* extract disk guid */
196 val = extract_val(str, "uuid_disk");
198 #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);
206 val = strsep(&val, ";");
207 if (extract_env(val, &p))
209 *str_disk_guid = strdup(p);
211 /* Move s to first partition */
221 /* calculate expected number of partitions */
229 /* allocate memory for partitions */
230 parts = calloc(sizeof(disk_partition_t), p_count);
232 /* retrieve partitions data from string */
233 for (i = 0; i < p_count; i++) {
234 tok = strsep(&s, ";");
240 val = extract_val(tok, "uuid");
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);
250 if (extract_env(val, &p))
252 if (strlen(p) >= sizeof(parts[i].uuid)) {
253 printf("Wrong uuid format for partition %d\n", i);
257 strcpy((char *)parts[i].uuid, p);
260 #ifdef CONFIG_PARTITION_TYPE_GUID
262 val = extract_val(tok, "type");
264 /* 'type' is optional */
265 if (extract_env(val, &p))
267 if (strlen(p) >= sizeof(parts[i].type_guid)) {
268 printf("Wrong type guid format for partition %d\n",
273 strcpy((char *)parts[i].type_guid, p);
278 val = extract_val(tok, "name");
279 if (!val) { /* name is mandatory */
283 if (extract_env(val, &p))
285 if (strlen(p) >= sizeof(parts[i].name)) {
289 strcpy((char *)parts[i].name, p);
293 val = extract_val(tok, "size");
294 if (!val) { /* 'size' is mandatory */
298 if (extract_env(val, &p))
300 if ((strcmp(p, "-") == 0)) {
301 /* Let part efi module to auto extend the size */
304 size_ll = ustrtoull(p, &p, 0);
305 parts[i].size = lldiv(size_ll, dev_desc->blksz);
311 val = extract_val(tok, "start");
312 if (val) { /* start address is optional */
313 if (extract_env(val, &p))
315 start_ll = ustrtoull(p, &p, 0);
316 parts[i].start = lldiv(start_ll, dev_desc->blksz);
320 offset += parts[i].size + parts[i].start;
323 if (found_key(tok, "bootable"))
324 parts[i].bootable = 1;
327 *parts_count = p_count;
334 free(*str_disk_guid);
340 static int gpt_default(struct blk_desc *blk_dev_desc, const char *str_part)
345 disk_partition_t *partitions = NULL;
347 /* fill partitions */
348 ret = set_gpt_info(blk_dev_desc, str_part,
349 &str_disk_guid, &partitions, &part_count);
352 printf("No partition list provided\n");
354 printf("Missing disk guid\n");
355 if ((ret == -3) || (ret == -4))
356 printf("Partition list incomplete\n");
360 /* save partitions layout to disk */
361 ret = gpt_restore(blk_dev_desc, str_disk_guid, partitions, part_count);
368 static int gpt_verify(struct blk_desc *blk_dev_desc, const char *str_part)
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;
378 /* fill partitions */
379 ret = set_gpt_info(blk_dev_desc, str_part,
380 &str_disk_guid, &partitions, &part_count);
383 printf("No partition list provided - only basic check\n");
384 ret = gpt_verify_headers(blk_dev_desc, gpt_head,
389 printf("Missing disk guid\n");
390 if ((ret == -3) || (ret == -4))
391 printf("Partition list incomplete\n");
395 /* Check partition layout with provided pattern */
396 ret = gpt_verify_partitions(blk_dev_desc, partitions, part_count,
406 * do_gpt(): Perform GPT operations
408 * @param cmdtp - command name
413 * @return zero on success; otherwise error
415 static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
417 int ret = CMD_RET_SUCCESS;
420 struct blk_desc *blk_dev_desc = NULL;
422 if (argc < 4 || argc > 5)
423 return CMD_RET_USAGE;
425 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;
430 blk_dev_desc = blk_get_dev(argv[2], dev);
432 printf("%s: %s dev %d NOT available\n",
433 __func__, argv[2], dev);
434 return CMD_RET_FAILURE;
437 if ((strcmp(argv[1], "write") == 0) && (argc == 5)) {
438 printf("Writing GPT: ");
439 ret = gpt_default(blk_dev_desc, argv[4]);
440 } else if ((strcmp(argv[1], "verify") == 0)) {
441 ret = gpt_verify(blk_dev_desc, argv[4]);
442 printf("Verify GPT: ");
444 return CMD_RET_USAGE;
449 return CMD_RET_FAILURE;
452 printf("success!\n");
453 return CMD_RET_SUCCESS;
456 U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
457 "GUID Partition Table",
458 "<command> <interface> <dev> <partitions_list>\n"
459 " - GUID partition table restoration and validity check\n"
460 " Restore or verify GPT information on a device connected\n"
463 " gpt write mmc 0 $partitions\n"
464 " gpt verify mmc 0 $partitions\n"