2 * cmd_gpt.c -- GPT (GUID Partition Table) handling command
4 * Copyright (C) 2012 Samsung Electronics
5 * author: Lukasz Majewski <l.majewski@samsung.com>
6 * author: Piotr Wilczek <p.wilczek@samsung.com>
8 * SPDX-License-Identifier: GPL-2.0+
17 #include <linux/ctype.h>
20 #ifndef CONFIG_PARTITION_UUIDS
21 #error CONFIG_PARTITION_UUIDS must be enabled for CONFIG_CMD_GPT to be enabled
25 * extract_env(): Expand env name from string format '&{env_name}'
26 * and return pointer to the env (if the env is set)
28 * @param str - pointer to string
29 * @param env - pointer to pointer to extracted env
31 * @return - zero on successful expand and env is set
33 static char extract_env(const char *str, char **env)
37 if (!str || strlen(str) < 4)
40 if ((strncmp(str, "${", 2) == 0) && (str[strlen(str) - 1] == '}')) {
44 memset(s + strlen(s) - 1, '\0', 1);
45 memmove(s, s + 2, strlen(s) - 1);
49 printf("Environmental '%s' not set\n", str);
50 return -1; /* env not set */
60 * extract_val(): Extract value from a key=value pair list (comma separated).
61 * Only value for the given key is returend.
62 * Function allocates memory for the value, remember to free!
64 * @param str - pointer to string with key=values pairs
65 * @param key - pointer to the key to search for
67 * @return - pointer to allocated string with the value
69 static char *extract_val(const char *str, const char *key)
75 strcopy = strdup(str);
87 if (strcmp(k, key) == 0) {
99 * set_gpt_info(): Fill partition information from string
100 * function allocates memory, remember to free!
102 * @param dev_desc - pointer block device descriptor
103 * @param str_part - pointer to string with partition information
104 * @param str_disk_guid - pointer to pointer to allocated string with disk guid
105 * @param partitions - pointer to pointer to allocated partitions array
106 * @param parts_count - number of partitions
108 * @return - zero on success, otherwise error
111 static int set_gpt_info(block_dev_desc_t *dev_desc,
112 const char *str_part,
113 char **str_disk_guid,
114 disk_partition_t **partitions,
121 disk_partition_t *parts;
123 uint64_t size_ll, start_ll;
125 debug("%s: MMC lba num: 0x%x %d\n", __func__,
126 (unsigned int)dev_desc->lba, (unsigned int)dev_desc->lba);
128 if (str_part == NULL)
131 str = strdup(str_part);
133 /* extract disk guid */
135 tok = strsep(&s, ";");
136 val = extract_val(tok, "uuid_disk");
141 if (extract_env(val, &p))
143 *str_disk_guid = strdup(p);
153 /* calculate expected number of partitions */
161 /* allocate memory for partitions */
162 parts = calloc(sizeof(disk_partition_t), p_count);
164 /* retrieve partitions data from string */
165 for (i = 0; i < p_count; i++) {
166 tok = strsep(&s, ";");
172 val = extract_val(tok, "uuid");
173 if (!val) { /* 'uuid' is mandatory */
177 if (extract_env(val, &p))
179 if (strlen(p) >= sizeof(parts[i].uuid)) {
180 printf("Wrong uuid format for partition %d\n", i);
184 strcpy((char *)parts[i].uuid, p);
188 val = extract_val(tok, "name");
189 if (!val) { /* name is mandatory */
193 if (extract_env(val, &p))
195 if (strlen(p) >= sizeof(parts[i].name)) {
199 strcpy((char *)parts[i].name, p);
203 val = extract_val(tok, "size");
204 if (!val) { /* 'size' is mandatory */
208 if (extract_env(val, &p))
210 size_ll = ustrtoull(p, &p, 0);
211 parts[i].size = lldiv(size_ll, dev_desc->blksz);
215 val = extract_val(tok, "start");
216 if (val) { /* start address is optional */
217 if (extract_env(val, &p))
219 start_ll = ustrtoull(p, &p, 0);
220 parts[i].start = lldiv(start_ll, dev_desc->blksz);
225 *parts_count = p_count;
232 free(*str_disk_guid);
238 static int gpt_mmc_default(int dev, const char *str_part)
243 disk_partition_t *partitions = NULL;
245 struct mmc *mmc = find_mmc_device(dev);
248 printf("%s: mmc dev %d NOT available\n", __func__, dev);
249 return CMD_RET_FAILURE;
255 /* fill partitions */
256 ret = set_gpt_info(&mmc->block_dev, str_part,
257 &str_disk_guid, &partitions, &part_count);
260 printf("No partition list provided\n");
262 printf("Missing disk guid\n");
263 if ((ret == -3) || (ret == -4))
264 printf("Partition list incomplete\n");
268 /* save partitions layout to disk */
269 gpt_restore(&mmc->block_dev, str_disk_guid, partitions, part_count);
277 * do_gpt(): Perform GPT operations
279 * @param cmdtp - command name
284 * @return zero on success; otherwise error
286 static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
288 int ret = CMD_RET_SUCCESS;
293 return CMD_RET_USAGE;
295 /* command: 'write' */
296 if ((strcmp(argv[1], "write") == 0) && (argc == 5)) {
298 if (strcmp(argv[2], "mmc") == 0) {
299 /* check if 'dev' is a number */
300 for (pstr = argv[3]; *pstr != '\0'; pstr++)
301 if (!isdigit(*pstr)) {
302 printf("'%s' is not a number\n",
304 return CMD_RET_USAGE;
306 dev = (int)simple_strtoul(argv[3], NULL, 10);
308 if (gpt_mmc_default(dev, argv[4]))
309 return CMD_RET_FAILURE;
312 return CMD_RET_USAGE;
317 U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
318 "GUID Partition Table",
319 "<command> <interface> <dev> <partitions_list>\n"
320 " - GUID partition table restoration\n"
321 " Restore GPT information on a device connected\n"