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Piotr Wilczek8b096232012-12-11 11:09:47 +01001/*
2 * cmd_gpt.c -- GPT (GUID Partition Table) handling command
3 *
4 * Copyright (C) 2012 Samsung Electronics
5 * author: Lukasz Majewski <l.majewski@samsung.com>
6 * author: Piotr Wilczek <p.wilczek@samsung.com>
7 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02008 * SPDX-License-Identifier: GPL-2.0+
Piotr Wilczek8b096232012-12-11 11:09:47 +01009 */
10
11#include <common.h>
12#include <malloc.h>
13#include <command.h>
Piotr Wilczek8b096232012-12-11 11:09:47 +010014#include <part_efi.h>
15#include <exports.h>
16#include <linux/ctype.h>
Piotr Wilczek3e34cf72013-01-27 22:59:25 +000017#include <div64.h>
Piotr Wilczek8b096232012-12-11 11:09:47 +010018
19#ifndef CONFIG_PARTITION_UUIDS
20#error CONFIG_PARTITION_UUIDS must be enabled for CONFIG_CMD_GPT to be enabled
21#endif
22
23/**
24 * extract_env(): Expand env name from string format '&{env_name}'
25 * and return pointer to the env (if the env is set)
26 *
27 * @param str - pointer to string
28 * @param env - pointer to pointer to extracted env
29 *
30 * @return - zero on successful expand and env is set
31 */
Przemyslaw Marczak39206382014-04-02 10:20:06 +020032static int extract_env(const char *str, char **env)
Piotr Wilczek8b096232012-12-11 11:09:47 +010033{
Przemyslaw Marczak39206382014-04-02 10:20:06 +020034 int ret = -1;
Piotr Wilczek8b096232012-12-11 11:09:47 +010035 char *e, *s;
Przemyslaw Marczak39206382014-04-02 10:20:06 +020036#ifdef CONFIG_RANDOM_UUID
37 char uuid_str[UUID_STR_LEN + 1];
38#endif
Piotr Wilczek8b096232012-12-11 11:09:47 +010039
40 if (!str || strlen(str) < 4)
41 return -1;
42
Przemyslaw Marczak39206382014-04-02 10:20:06 +020043 if (!((strncmp(str, "${", 2) == 0) && (str[strlen(str) - 1] == '}')))
44 return -1;
45
46 s = strdup(str);
47 if (s == NULL)
48 return -1;
49
50 memset(s + strlen(s) - 1, '\0', 1);
51 memmove(s, s + 2, strlen(s) - 1);
52
53 e = getenv(s);
54 if (e == NULL) {
55#ifdef CONFIG_RANDOM_UUID
56 debug("%s unset. ", str);
57 gen_rand_uuid_str(uuid_str, UUID_STR_FORMAT_STD);
58 setenv(s, uuid_str);
59
Piotr Wilczek8b096232012-12-11 11:09:47 +010060 e = getenv(s);
Przemyslaw Marczak39206382014-04-02 10:20:06 +020061 if (e) {
62 debug("Set to random.\n");
63 ret = 0;
64 } else {
65 debug("Can't get random UUID.\n");
Piotr Wilczek8b096232012-12-11 11:09:47 +010066 }
Przemyslaw Marczak39206382014-04-02 10:20:06 +020067#else
68 debug("%s unset.\n", str);
69#endif
70 } else {
71 debug("%s get from environment.\n", str);
72 ret = 0;
Piotr Wilczek8b096232012-12-11 11:09:47 +010073 }
74
Przemyslaw Marczak39206382014-04-02 10:20:06 +020075 *env = e;
76 free(s);
77
78 return ret;
Piotr Wilczek8b096232012-12-11 11:09:47 +010079}
80
81/**
82 * extract_val(): Extract value from a key=value pair list (comma separated).
83 * Only value for the given key is returend.
84 * Function allocates memory for the value, remember to free!
85 *
86 * @param str - pointer to string with key=values pairs
87 * @param key - pointer to the key to search for
88 *
89 * @return - pointer to allocated string with the value
90 */
91static char *extract_val(const char *str, const char *key)
92{
93 char *v, *k;
94 char *s, *strcopy;
95 char *new = NULL;
96
97 strcopy = strdup(str);
98 if (strcopy == NULL)
99 return NULL;
100
101 s = strcopy;
102 while (s) {
103 v = strsep(&s, ",");
104 if (!v)
105 break;
106 k = strsep(&v, "=");
107 if (!k)
108 break;
109 if (strcmp(k, key) == 0) {
110 new = strdup(v);
111 break;
112 }
113 }
114
115 free(strcopy);
116
117 return new;
118}
119
120/**
121 * set_gpt_info(): Fill partition information from string
122 * function allocates memory, remember to free!
123 *
124 * @param dev_desc - pointer block device descriptor
125 * @param str_part - pointer to string with partition information
126 * @param str_disk_guid - pointer to pointer to allocated string with disk guid
127 * @param partitions - pointer to pointer to allocated partitions array
128 * @param parts_count - number of partitions
129 *
130 * @return - zero on success, otherwise error
131 *
132 */
133static int set_gpt_info(block_dev_desc_t *dev_desc,
134 const char *str_part,
135 char **str_disk_guid,
136 disk_partition_t **partitions,
137 u8 *parts_count)
138{
139 char *tok, *str, *s;
140 int i;
141 char *val, *p;
142 int p_count;
143 disk_partition_t *parts;
144 int errno = 0;
Piotr Wilczek3e34cf72013-01-27 22:59:25 +0000145 uint64_t size_ll, start_ll;
Piotr Wilczek8b096232012-12-11 11:09:47 +0100146
Egbert Eich619f0fd2013-10-04 18:53:04 +0200147 debug("%s: lba num: 0x%x %d\n", __func__,
Piotr Wilczek8b096232012-12-11 11:09:47 +0100148 (unsigned int)dev_desc->lba, (unsigned int)dev_desc->lba);
149
150 if (str_part == NULL)
151 return -1;
152
153 str = strdup(str_part);
154
155 /* extract disk guid */
156 s = str;
Rob Herring0c7e8d12015-01-26 09:44:18 -0600157 val = extract_val(str, "uuid_disk");
Piotr Wilczek8b096232012-12-11 11:09:47 +0100158 if (!val) {
Rob Herring0c7e8d12015-01-26 09:44:18 -0600159#ifdef CONFIG_RANDOM_UUID
160 *str_disk_guid = malloc(UUID_STR_LEN + 1);
161 gen_rand_uuid_str(*str_disk_guid, UUID_STR_FORMAT_STD);
162#else
Piotr Wilczek8b096232012-12-11 11:09:47 +0100163 free(str);
164 return -2;
Rob Herring0c7e8d12015-01-26 09:44:18 -0600165#endif
166 } else {
167 val = strsep(&val, ";");
168 if (extract_env(val, &p))
169 p = val;
170 *str_disk_guid = strdup(p);
171 free(val);
172 /* Move s to first partition */
173 strsep(&s, ";");
Piotr Wilczek8b096232012-12-11 11:09:47 +0100174 }
Piotr Wilczek8b096232012-12-11 11:09:47 +0100175 if (strlen(s) == 0)
176 return -3;
177
178 i = strlen(s) - 1;
179 if (s[i] == ';')
180 s[i] = '\0';
181
182 /* calculate expected number of partitions */
183 p_count = 1;
184 p = s;
185 while (*p) {
186 if (*p++ == ';')
187 p_count++;
188 }
189
190 /* allocate memory for partitions */
191 parts = calloc(sizeof(disk_partition_t), p_count);
192
Robert P. J. Day1f8b5462013-08-21 11:39:19 -0400193 /* retrieve partitions data from string */
Piotr Wilczek8b096232012-12-11 11:09:47 +0100194 for (i = 0; i < p_count; i++) {
195 tok = strsep(&s, ";");
196
197 if (tok == NULL)
198 break;
199
200 /* uuid */
201 val = extract_val(tok, "uuid");
Rob Herring0c7e8d12015-01-26 09:44:18 -0600202 if (!val) {
203 /* 'uuid' is optional if random uuid's are enabled */
204#ifdef CONFIG_RANDOM_UUID
205 gen_rand_uuid_str(parts[i].uuid, UUID_STR_FORMAT_STD);
206#else
Piotr Wilczek8b096232012-12-11 11:09:47 +0100207 errno = -4;
208 goto err;
Rob Herring0c7e8d12015-01-26 09:44:18 -0600209#endif
210 } else {
211 if (extract_env(val, &p))
212 p = val;
213 if (strlen(p) >= sizeof(parts[i].uuid)) {
214 printf("Wrong uuid format for partition %d\n", i);
215 errno = -4;
216 goto err;
217 }
218 strcpy((char *)parts[i].uuid, p);
219 free(val);
Piotr Wilczek8b096232012-12-11 11:09:47 +0100220 }
Piotr Wilczek8b096232012-12-11 11:09:47 +0100221 /* name */
222 val = extract_val(tok, "name");
223 if (!val) { /* name is mandatory */
224 errno = -4;
225 goto err;
226 }
227 if (extract_env(val, &p))
228 p = val;
229 if (strlen(p) >= sizeof(parts[i].name)) {
230 errno = -4;
231 goto err;
232 }
233 strcpy((char *)parts[i].name, p);
234 free(val);
235
236 /* size */
237 val = extract_val(tok, "size");
238 if (!val) { /* 'size' is mandatory */
239 errno = -4;
240 goto err;
241 }
242 if (extract_env(val, &p))
243 p = val;
Piotr Wilczek3e34cf72013-01-27 22:59:25 +0000244 size_ll = ustrtoull(p, &p, 0);
245 parts[i].size = lldiv(size_ll, dev_desc->blksz);
Piotr Wilczek8b096232012-12-11 11:09:47 +0100246 free(val);
247
248 /* start address */
249 val = extract_val(tok, "start");
250 if (val) { /* start address is optional */
251 if (extract_env(val, &p))
252 p = val;
Piotr Wilczek3e34cf72013-01-27 22:59:25 +0000253 start_ll = ustrtoull(p, &p, 0);
254 parts[i].start = lldiv(start_ll, dev_desc->blksz);
Piotr Wilczek8b096232012-12-11 11:09:47 +0100255 free(val);
256 }
257 }
258
259 *parts_count = p_count;
260 *partitions = parts;
261 free(str);
262
263 return 0;
264err:
265 free(str);
266 free(*str_disk_guid);
267 free(parts);
268
269 return errno;
270}
271
Egbert Eich619f0fd2013-10-04 18:53:04 +0200272static int gpt_default(block_dev_desc_t *blk_dev_desc, const char *str_part)
Piotr Wilczek8b096232012-12-11 11:09:47 +0100273{
274 int ret;
275 char *str_disk_guid;
276 u8 part_count = 0;
277 disk_partition_t *partitions = NULL;
278
Piotr Wilczek8b096232012-12-11 11:09:47 +0100279 if (!str_part)
280 return -1;
281
282 /* fill partitions */
Egbert Eich619f0fd2013-10-04 18:53:04 +0200283 ret = set_gpt_info(blk_dev_desc, str_part,
Piotr Wilczek8b096232012-12-11 11:09:47 +0100284 &str_disk_guid, &partitions, &part_count);
285 if (ret) {
286 if (ret == -1)
287 printf("No partition list provided\n");
288 if (ret == -2)
289 printf("Missing disk guid\n");
290 if ((ret == -3) || (ret == -4))
291 printf("Partition list incomplete\n");
292 return -1;
293 }
294
295 /* save partitions layout to disk */
Rob Herringa150e6c2015-01-26 09:43:15 -0600296 ret = gpt_restore(blk_dev_desc, str_disk_guid, partitions, part_count);
Piotr Wilczek8b096232012-12-11 11:09:47 +0100297 free(str_disk_guid);
298 free(partitions);
299
Rob Herringa150e6c2015-01-26 09:43:15 -0600300 return ret;
Piotr Wilczek8b096232012-12-11 11:09:47 +0100301}
302
303/**
304 * do_gpt(): Perform GPT operations
305 *
306 * @param cmdtp - command name
307 * @param flag
308 * @param argc
309 * @param argv
310 *
311 * @return zero on success; otherwise error
312 */
313static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
314{
315 int ret = CMD_RET_SUCCESS;
316 int dev = 0;
Egbert Eich619f0fd2013-10-04 18:53:04 +0200317 char *ep;
318 block_dev_desc_t *blk_dev_desc;
Piotr Wilczek8b096232012-12-11 11:09:47 +0100319
320 if (argc < 5)
321 return CMD_RET_USAGE;
322
323 /* command: 'write' */
324 if ((strcmp(argv[1], "write") == 0) && (argc == 5)) {
Egbert Eich619f0fd2013-10-04 18:53:04 +0200325 dev = (int)simple_strtoul(argv[3], &ep, 10);
326 if (!ep || ep[0] != '\0') {
327 printf("'%s' is not a number\n", argv[3]);
328 return CMD_RET_USAGE;
Piotr Wilczek8b096232012-12-11 11:09:47 +0100329 }
Egbert Eich619f0fd2013-10-04 18:53:04 +0200330 blk_dev_desc = get_dev(argv[2], dev);
331 if (!blk_dev_desc) {
332 printf("%s: %s dev %d NOT available\n",
333 __func__, argv[2], dev);
334 return CMD_RET_FAILURE;
335 }
336
Przemyslaw Marczak39206382014-04-02 10:20:06 +0200337 puts("Writing GPT: ");
338
339 ret = gpt_default(blk_dev_desc, argv[4]);
340 if (!ret) {
341 puts("success!\n");
342 return CMD_RET_SUCCESS;
343 } else {
344 puts("error!\n");
Egbert Eich619f0fd2013-10-04 18:53:04 +0200345 return CMD_RET_FAILURE;
Przemyslaw Marczak39206382014-04-02 10:20:06 +0200346 }
Piotr Wilczek8b096232012-12-11 11:09:47 +0100347 } else {
348 return CMD_RET_USAGE;
349 }
350 return ret;
351}
352
353U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
354 "GUID Partition Table",
Robert P. J. Day1f8b5462013-08-21 11:39:19 -0400355 "<command> <interface> <dev> <partitions_list>\n"
Piotr Wilczek8b096232012-12-11 11:09:47 +0100356 " - GUID partition table restoration\n"
357 " Restore GPT information on a device connected\n"
358 " to interface\n"
359);