summaryrefslogtreecommitdiff
path: root/common/cmd_gpt.c
blob: 06767aa5e5045f831183c93804f60049da33f626 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
/*
 * cmd_gpt.c -- GPT (GUID Partition Table) handling command
 *
 * Copyright (C) 2012 Samsung Electronics
 * author: Lukasz Majewski <l.majewski@samsung.com>
 * author: Piotr Wilczek <p.wilczek@samsung.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <malloc.h>
#include <command.h>
#include <mmc.h>
#include <part_efi.h>
#include <exports.h>
#include <linux/ctype.h>
#include <div64.h>

#ifndef CONFIG_PARTITION_UUIDS
#error CONFIG_PARTITION_UUIDS must be enabled for CONFIG_CMD_GPT to be enabled
#endif

/**
 * extract_env(): Expand env name from string format '&{env_name}'
 *                and return pointer to the env (if the env is set)
 *
 * @param str - pointer to string
 * @param env - pointer to pointer to extracted env
 *
 * @return - zero on successful expand and env is set
 */
static char extract_env(const char *str, char **env)
{
	char *e, *s;

	if (!str || strlen(str) < 4)
		return -1;

	if ((strncmp(str, "${", 2) == 0) && (str[strlen(str) - 1] == '}')) {
		s = strdup(str);
		if (s == NULL)
			return -1;
		memset(s + strlen(s) - 1, '\0', 1);
		memmove(s, s + 2, strlen(s) - 1);
		e = getenv(s);
		free(s);
		if (e == NULL) {
			printf("Environmental '%s' not set\n", str);
			return -1; /* env not set */
		}
		*env = e;
		return 0;
	}

	return -1;
}

/**
 * extract_val(): Extract value from a key=value pair list (comma separated).
 *                Only value for the given key is returend.
 *                Function allocates memory for the value, remember to free!
 *
 * @param str - pointer to string with key=values pairs
 * @param key - pointer to the key to search for
 *
 * @return - pointer to allocated string with the value
 */
static char *extract_val(const char *str, const char *key)
{
	char *v, *k;
	char *s, *strcopy;
	char *new = NULL;

	strcopy = strdup(str);
	if (strcopy == NULL)
		return NULL;

	s = strcopy;
	while (s) {
		v = strsep(&s, ",");
		if (!v)
			break;
		k = strsep(&v, "=");
		if (!k)
			break;
		if  (strcmp(k, key) == 0) {
			new = strdup(v);
			break;
		}
	}

	free(strcopy);

	return new;
}

/**
 * set_gpt_info(): Fill partition information from string
 *		function allocates memory, remember to free!
 *
 * @param dev_desc - pointer block device descriptor
 * @param str_part - pointer to string with partition information
 * @param str_disk_guid - pointer to pointer to allocated string with disk guid
 * @param partitions - pointer to pointer to allocated partitions array
 * @param parts_count - number of partitions
 *
 * @return - zero on success, otherwise error
 *
 */
static int set_gpt_info(block_dev_desc_t *dev_desc,
			const char *str_part,
			char **str_disk_guid,
			disk_partition_t **partitions,
			u8 *parts_count)
{
	char *tok, *str, *s;
	int i;
	char *val, *p;
	int p_count;
	disk_partition_t *parts;
	int errno = 0;
	uint64_t size_ll, start_ll;

	debug("%s: MMC lba num: 0x%x %d\n", __func__,
	      (unsigned int)dev_desc->lba, (unsigned int)dev_desc->lba);

	if (str_part == NULL)
		return -1;

	str = strdup(str_part);

	/* extract disk guid */
	s = str;
	tok = strsep(&s, ";");
	val = extract_val(tok, "uuid_disk");
	if (!val) {
		free(str);
		return -2;
	}
	if (extract_env(val, &p))
		p = val;
	*str_disk_guid = strdup(p);
	free(val);

	if (strlen(s) == 0)
		return -3;

	i = strlen(s) - 1;
	if (s[i] == ';')
		s[i] = '\0';

	/* calculate expected number of partitions */
	p_count = 1;
	p = s;
	while (*p) {
		if (*p++ == ';')
			p_count++;
	}

	/* allocate memory for partitions */
	parts = calloc(sizeof(disk_partition_t), p_count);

	/* retrive partions data from string */
	for (i = 0; i < p_count; i++) {
		tok = strsep(&s, ";");

		if (tok == NULL)
			break;

		/* uuid */
		val = extract_val(tok, "uuid");
		if (!val) { /* 'uuid' is mandatory */
			errno = -4;
			goto err;
		}
		if (extract_env(val, &p))
			p = val;
		if (strlen(p) >= sizeof(parts[i].uuid)) {
			printf("Wrong uuid format for partition %d\n", i);
			errno = -4;
			goto err;
		}
		strcpy((char *)parts[i].uuid, p);
		free(val);

		/* name */
		val = extract_val(tok, "name");
		if (!val) { /* name is mandatory */
			errno = -4;
			goto err;
		}
		if (extract_env(val, &p))
			p = val;
		if (strlen(p) >= sizeof(parts[i].name)) {
			errno = -4;
			goto err;
		}
		strcpy((char *)parts[i].name, p);
		free(val);

		/* size */
		val = extract_val(tok, "size");
		if (!val) { /* 'size' is mandatory */
			errno = -4;
			goto err;
		}
		if (extract_env(val, &p))
			p = val;
		size_ll = ustrtoull(p, &p, 0);
		parts[i].size = lldiv(size_ll, dev_desc->blksz);
		free(val);

		/* start address */
		val = extract_val(tok, "start");
		if (val) { /* start address is optional */
			if (extract_env(val, &p))
				p = val;
			start_ll = ustrtoull(p, &p, 0);
			parts[i].start = lldiv(start_ll, dev_desc->blksz);
			free(val);
		}
	}

	*parts_count = p_count;
	*partitions = parts;
	free(str);

	return 0;
err:
	free(str);
	free(*str_disk_guid);
	free(parts);

	return errno;
}

static int gpt_mmc_default(int dev, const char *str_part)
{
	int ret;
	char *str_disk_guid;
	u8 part_count = 0;
	disk_partition_t *partitions = NULL;

	struct mmc *mmc = find_mmc_device(dev);

	if (mmc == NULL) {
		printf("%s: mmc dev %d NOT available\n", __func__, dev);
		return CMD_RET_FAILURE;
	}

	if (!str_part)
		return -1;

	/* fill partitions */
	ret = set_gpt_info(&mmc->block_dev, str_part,
			&str_disk_guid, &partitions, &part_count);
	if (ret) {
		if (ret == -1)
			printf("No partition list provided\n");
		if (ret == -2)
			printf("Missing disk guid\n");
		if ((ret == -3) || (ret == -4))
			printf("Partition list incomplete\n");
		return -1;
	}

	/* save partitions layout to disk */
	gpt_restore(&mmc->block_dev, str_disk_guid, partitions, part_count);
	free(str_disk_guid);
	free(partitions);

	return 0;
}

/**
 * do_gpt(): Perform GPT operations
 *
 * @param cmdtp - command name
 * @param flag
 * @param argc
 * @param argv
 *
 * @return zero on success; otherwise error
 */
static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	int ret = CMD_RET_SUCCESS;
	int dev = 0;
	char *pstr;

	if (argc < 5)
		return CMD_RET_USAGE;

	/* command: 'write' */
	if ((strcmp(argv[1], "write") == 0) && (argc == 5)) {
		/* device: 'mmc' */
		if (strcmp(argv[2], "mmc") == 0) {
			/* check if 'dev' is a number */
			for (pstr = argv[3]; *pstr != '\0'; pstr++)
				if (!isdigit(*pstr)) {
					printf("'%s' is not a number\n",
						argv[3]);
					return CMD_RET_USAGE;
				}
			dev = (int)simple_strtoul(argv[3], NULL, 10);
			/* write to mmc */
			if (gpt_mmc_default(dev, argv[4]))
				return CMD_RET_FAILURE;
		}
	} else {
		return CMD_RET_USAGE;
	}
	return ret;
}

U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt,
	"GUID Partition Table",
	"<command> <interface> <dev> <partions_list>\n"
	" - GUID partition table restoration\n"
	" Restore GPT information on a device connected\n"
	" to interface\n"
);