1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2000-2013
4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5  *
6  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
7  * Andreas Heppel <aheppel@sysgo.de>
8  *
9  * Copyright 2011 Freescale Semiconductor, Inc.
10  */
11 
12 /*
13  * Support for persistent environment data
14  *
15  * The "environment" is stored on external storage as a list of '\0'
16  * terminated "name=value" strings. The end of the list is marked by
17  * a double '\0'. The environment is preceded by a 32 bit CRC over
18  * the data part and, in case of redundant environment, a byte of
19  * flags.
20  *
21  * This linearized representation will also be used before
22  * relocation, i. e. as long as we don't have a full C runtime
23  * environment. After that, we use a hash table.
24  */
25 
26 #include <common.h>
27 #include <cli.h>
28 #include <command.h>
29 #include <console.h>
30 #include <env.h>
31 #include <env_internal.h>
32 #include <log.h>
33 #include <search.h>
34 #include <errno.h>
35 #include <malloc.h>
36 #include <mapmem.h>
37 #include <asm/global_data.h>
38 #include <linux/bitops.h>
39 #include <u-boot/crc.h>
40 #include <linux/stddef.h>
41 #include <asm/byteorder.h>
42 #include <asm/io.h>
43 
44 DECLARE_GLOBAL_DATA_PTR;
45 
46 #if	defined(CONFIG_ENV_IS_IN_EEPROM)	|| \
47 	defined(CONFIG_ENV_IS_IN_FLASH)		|| \
48 	defined(CONFIG_ENV_IS_IN_MMC)		|| \
49 	defined(CONFIG_ENV_IS_IN_FAT)		|| \
50 	defined(CONFIG_ENV_IS_IN_EXT4)		|| \
51 	defined(CONFIG_ENV_IS_IN_NAND)		|| \
52 	defined(CONFIG_ENV_IS_IN_NVRAM)		|| \
53 	defined(CONFIG_ENV_IS_IN_ONENAND)	|| \
54 	defined(CONFIG_ENV_IS_IN_SATA)		|| \
55 	defined(CONFIG_ENV_IS_IN_SPI_FLASH)	|| \
56 	defined(CONFIG_ENV_IS_IN_REMOTE)	|| \
57 	defined(CONFIG_ENV_IS_IN_UBI)
58 
59 #define ENV_IS_IN_DEVICE
60 
61 #endif
62 
63 #if	!defined(ENV_IS_IN_DEVICE)		&& \
64 	!defined(CONFIG_ENV_IS_NOWHERE)
65 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|MMC|FAT|EXT4|\
66 NAND|NVRAM|ONENAND|SATA|SPI_FLASH|REMOTE|UBI} or CONFIG_ENV_IS_NOWHERE
67 #endif
68 
69 /*
70  * Maximum expected input data size for import command
71  */
72 #define	MAX_ENV_SIZE	(1 << 20)	/* 1 MiB */
73 
74 /*
75  * This variable is incremented on each do_env_set(), so it can
76  * be used via env_get_id() as an indication, if the environment
77  * has changed or not. So it is possible to reread an environment
78  * variable only if the environment was changed ... done so for
79  * example in NetInitLoop()
80  */
81 static int env_id = 1;
82 
env_get_id(void)83 int env_get_id(void)
84 {
85 	return env_id;
86 }
87 
88 #ifndef CONFIG_SPL_BUILD
89 /*
90  * Command interface: print one or all environment variables
91  *
92  * Returns 0 in case of error, or length of printed string
93  */
env_print(char * name,int flag)94 static int env_print(char *name, int flag)
95 {
96 	char *res = NULL;
97 	ssize_t len;
98 
99 	if (name) {		/* print a single name */
100 		struct env_entry e, *ep;
101 
102 		e.key = name;
103 		e.data = NULL;
104 		hsearch_r(e, ENV_FIND, &ep, &env_htab, flag);
105 		if (ep == NULL)
106 			return 0;
107 		len = printf("%s=%s\n", ep->key, ep->data);
108 		return len;
109 	}
110 
111 	/* print whole list */
112 	len = hexport_r(&env_htab, '\n', flag, &res, 0, 0, NULL);
113 
114 	if (len > 0) {
115 		puts(res);
116 		free(res);
117 		return len;
118 	}
119 
120 	/* should never happen */
121 	printf("## Error: cannot export environment\n");
122 	return 0;
123 }
124 
do_env_print(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])125 static int do_env_print(struct cmd_tbl *cmdtp, int flag, int argc,
126 			char *const argv[])
127 {
128 	int i;
129 	int rcode = 0;
130 	int env_flag = H_HIDE_DOT;
131 
132 #if defined(CONFIG_CMD_NVEDIT_EFI)
133 	if (argc > 1 && argv[1][0] == '-' && argv[1][1] == 'e')
134 		return do_env_print_efi(cmdtp, flag, --argc, ++argv);
135 #endif
136 
137 	if (argc > 1 && argv[1][0] == '-' && argv[1][1] == 'a') {
138 		argc--;
139 		argv++;
140 		env_flag &= ~H_HIDE_DOT;
141 	}
142 
143 	if (argc == 1) {
144 		/* print all env vars */
145 		rcode = env_print(NULL, env_flag);
146 		if (!rcode)
147 			return 1;
148 		printf("\nEnvironment size: %d/%ld bytes\n",
149 			rcode, (ulong)ENV_SIZE);
150 		return 0;
151 	}
152 
153 	/* print selected env vars */
154 	env_flag &= ~H_HIDE_DOT;
155 	for (i = 1; i < argc; ++i) {
156 		int rc = env_print(argv[i], env_flag);
157 		if (!rc) {
158 			printf("## Error: \"%s\" not defined\n", argv[i]);
159 			++rcode;
160 		}
161 	}
162 
163 	return rcode;
164 }
165 
166 #ifdef CONFIG_CMD_GREPENV
do_env_grep(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])167 static int do_env_grep(struct cmd_tbl *cmdtp, int flag,
168 		       int argc, char *const argv[])
169 {
170 	char *res = NULL;
171 	int len, grep_how, grep_what;
172 
173 	if (argc < 2)
174 		return CMD_RET_USAGE;
175 
176 	grep_how  = H_MATCH_SUBSTR;	/* default: substring search	*/
177 	grep_what = H_MATCH_BOTH;	/* default: grep names and values */
178 
179 	while (--argc > 0 && **++argv == '-') {
180 		char *arg = *argv;
181 		while (*++arg) {
182 			switch (*arg) {
183 #ifdef CONFIG_REGEX
184 			case 'e':		/* use regex matching */
185 				grep_how  = H_MATCH_REGEX;
186 				break;
187 #endif
188 			case 'n':		/* grep for name */
189 				grep_what = H_MATCH_KEY;
190 				break;
191 			case 'v':		/* grep for value */
192 				grep_what = H_MATCH_DATA;
193 				break;
194 			case 'b':		/* grep for both */
195 				grep_what = H_MATCH_BOTH;
196 				break;
197 			case '-':
198 				goto DONE;
199 			default:
200 				return CMD_RET_USAGE;
201 			}
202 		}
203 	}
204 
205 DONE:
206 	len = hexport_r(&env_htab, '\n',
207 			flag | grep_what | grep_how,
208 			&res, 0, argc, argv);
209 
210 	if (len > 0) {
211 		puts(res);
212 		free(res);
213 	}
214 
215 	if (len < 2)
216 		return 1;
217 
218 	return 0;
219 }
220 #endif
221 #endif /* CONFIG_SPL_BUILD */
222 
223 /*
224  * Set a new environment variable,
225  * or replace or delete an existing one.
226  */
_do_env_set(int flag,int argc,char * const argv[],int env_flag)227 static int _do_env_set(int flag, int argc, char *const argv[], int env_flag)
228 {
229 	int   i, len;
230 	char  *name, *value, *s;
231 	struct env_entry e, *ep;
232 
233 	debug("Initial value for argc=%d\n", argc);
234 
235 #if CONFIG_IS_ENABLED(CMD_NVEDIT_EFI)
236 	if (argc > 1 && argv[1][0] == '-' && argv[1][1] == 'e')
237 		return do_env_set_efi(NULL, flag, --argc, ++argv);
238 #endif
239 
240 	while (argc > 1 && **(argv + 1) == '-') {
241 		char *arg = *++argv;
242 
243 		--argc;
244 		while (*++arg) {
245 			switch (*arg) {
246 			case 'f':		/* force */
247 				env_flag |= H_FORCE;
248 				break;
249 			default:
250 				return CMD_RET_USAGE;
251 			}
252 		}
253 	}
254 	debug("Final value for argc=%d\n", argc);
255 	name = argv[1];
256 
257 	if (strchr(name, '=')) {
258 		printf("## Error: illegal character '='"
259 		       "in variable name \"%s\"\n", name);
260 		return 1;
261 	}
262 
263 	env_id++;
264 
265 	/* Delete only ? */
266 	if (argc < 3 || argv[2] == NULL) {
267 		int rc = hdelete_r(name, &env_htab, env_flag);
268 
269 		/* If the variable didn't exist, don't report an error */
270 		return rc && rc != -ENOENT ? 1 : 0;
271 	}
272 
273 	/*
274 	 * Insert / replace new value
275 	 */
276 	for (i = 2, len = 0; i < argc; ++i)
277 		len += strlen(argv[i]) + 1;
278 
279 	value = malloc(len);
280 	if (value == NULL) {
281 		printf("## Can't malloc %d bytes\n", len);
282 		return 1;
283 	}
284 	for (i = 2, s = value; i < argc; ++i) {
285 		char *v = argv[i];
286 
287 		while ((*s++ = *v++) != '\0')
288 			;
289 		*(s - 1) = ' ';
290 	}
291 	if (s != value)
292 		*--s = '\0';
293 
294 	e.key	= name;
295 	e.data	= value;
296 	hsearch_r(e, ENV_ENTER, &ep, &env_htab, env_flag);
297 	free(value);
298 	if (!ep) {
299 		printf("## Error inserting \"%s\" variable, errno=%d\n",
300 			name, errno);
301 		return 1;
302 	}
303 
304 	return 0;
305 }
306 
env_set(const char * varname,const char * varvalue)307 int env_set(const char *varname, const char *varvalue)
308 {
309 	const char * const argv[4] = { "setenv", varname, varvalue, NULL };
310 
311 	/* before import into hashtable */
312 	if (!(gd->flags & GD_FLG_ENV_READY))
313 		return 1;
314 
315 	if (varvalue == NULL || varvalue[0] == '\0')
316 		return _do_env_set(0, 2, (char * const *)argv, H_PROGRAMMATIC);
317 	else
318 		return _do_env_set(0, 3, (char * const *)argv, H_PROGRAMMATIC);
319 }
320 
321 #ifndef CONFIG_SPL_BUILD
do_env_set(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])322 static int do_env_set(struct cmd_tbl *cmdtp, int flag, int argc,
323 		      char *const argv[])
324 {
325 	if (argc < 2)
326 		return CMD_RET_USAGE;
327 
328 	return _do_env_set(flag, argc, argv, H_INTERACTIVE);
329 }
330 
331 /*
332  * Prompt for environment variable
333  */
334 #if defined(CONFIG_CMD_ASKENV)
do_env_ask(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])335 int do_env_ask(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
336 {
337 	char message[CONFIG_SYS_CBSIZE];
338 	int i, len, pos, size;
339 	char *local_args[4];
340 	char *endptr;
341 
342 	local_args[0] = argv[0];
343 	local_args[1] = argv[1];
344 	local_args[2] = NULL;
345 	local_args[3] = NULL;
346 
347 	/*
348 	 * Check the syntax:
349 	 *
350 	 * env_ask envname [message1 ...] [size]
351 	 */
352 	if (argc == 1)
353 		return CMD_RET_USAGE;
354 
355 	/*
356 	 * We test the last argument if it can be converted
357 	 * into a decimal number.  If yes, we assume it's
358 	 * the size.  Otherwise we echo it as part of the
359 	 * message.
360 	 */
361 	i = dectoul(argv[argc - 1], &endptr);
362 	if (*endptr != '\0') {			/* no size */
363 		size = CONFIG_SYS_CBSIZE - 1;
364 	} else {				/* size given */
365 		size = i;
366 		--argc;
367 	}
368 
369 	if (argc <= 2) {
370 		sprintf(message, "Please enter '%s': ", argv[1]);
371 	} else {
372 		/* env_ask envname message1 ... messagen [size] */
373 		for (i = 2, pos = 0; i < argc && pos+1 < sizeof(message); i++) {
374 			if (pos)
375 				message[pos++] = ' ';
376 
377 			strncpy(message + pos, argv[i], sizeof(message) - pos);
378 			pos += strlen(argv[i]);
379 		}
380 		if (pos < sizeof(message) - 1) {
381 			message[pos++] = ' ';
382 			message[pos] = '\0';
383 		} else
384 			message[CONFIG_SYS_CBSIZE - 1] = '\0';
385 	}
386 
387 	if (size >= CONFIG_SYS_CBSIZE)
388 		size = CONFIG_SYS_CBSIZE - 1;
389 
390 	if (size <= 0)
391 		return 1;
392 
393 	/* prompt for input */
394 	len = cli_readline(message);
395 
396 	if (size < len)
397 		console_buffer[size] = '\0';
398 
399 	len = 2;
400 	if (console_buffer[0] != '\0') {
401 		local_args[2] = console_buffer;
402 		len = 3;
403 	}
404 
405 	/* Continue calling setenv code */
406 	return _do_env_set(flag, len, local_args, H_INTERACTIVE);
407 }
408 #endif
409 
410 #if defined(CONFIG_CMD_ENV_CALLBACK)
print_static_binding(const char * var_name,const char * callback_name,void * priv)411 static int print_static_binding(const char *var_name, const char *callback_name,
412 				void *priv)
413 {
414 	printf("\t%-20s %-20s\n", var_name, callback_name);
415 
416 	return 0;
417 }
418 
print_active_callback(struct env_entry * entry)419 static int print_active_callback(struct env_entry *entry)
420 {
421 	struct env_clbk_tbl *clbkp;
422 	int i;
423 	int num_callbacks;
424 
425 	if (entry->callback == NULL)
426 		return 0;
427 
428 	/* look up the callback in the linker-list */
429 	num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
430 	for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
431 	     i < num_callbacks;
432 	     i++, clbkp++) {
433 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
434 		if (entry->callback == clbkp->callback + gd->reloc_off)
435 #else
436 		if (entry->callback == clbkp->callback)
437 #endif
438 			break;
439 	}
440 
441 	if (i == num_callbacks)
442 		/* this should probably never happen, but just in case... */
443 		printf("\t%-20s %p\n", entry->key, entry->callback);
444 	else
445 		printf("\t%-20s %-20s\n", entry->key, clbkp->name);
446 
447 	return 0;
448 }
449 
450 /*
451  * Print the callbacks available and what they are bound to
452  */
do_env_callback(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])453 int do_env_callback(struct cmd_tbl *cmdtp, int flag, int argc,
454 		    char *const argv[])
455 {
456 	struct env_clbk_tbl *clbkp;
457 	int i;
458 	int num_callbacks;
459 
460 	/* Print the available callbacks */
461 	puts("Available callbacks:\n");
462 	puts("\tCallback Name\n");
463 	puts("\t-------------\n");
464 	num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
465 	for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
466 	     i < num_callbacks;
467 	     i++, clbkp++)
468 		printf("\t%s\n", clbkp->name);
469 	puts("\n");
470 
471 	/* Print the static bindings that may exist */
472 	puts("Static callback bindings:\n");
473 	printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
474 	printf("\t%-20s %-20s\n", "-------------", "-------------");
475 	env_attr_walk(ENV_CALLBACK_LIST_STATIC, print_static_binding, NULL);
476 	puts("\n");
477 
478 	/* walk through each variable and print the callback if it has one */
479 	puts("Active callback bindings:\n");
480 	printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
481 	printf("\t%-20s %-20s\n", "-------------", "-------------");
482 	hwalk_r(&env_htab, print_active_callback);
483 	return 0;
484 }
485 #endif
486 
487 #if defined(CONFIG_CMD_ENV_FLAGS)
print_static_flags(const char * var_name,const char * flags,void * priv)488 static int print_static_flags(const char *var_name, const char *flags,
489 			      void *priv)
490 {
491 	enum env_flags_vartype type = env_flags_parse_vartype(flags);
492 	enum env_flags_varaccess access = env_flags_parse_varaccess(flags);
493 
494 	printf("\t%-20s %-20s %-20s\n", var_name,
495 		env_flags_get_vartype_name(type),
496 		env_flags_get_varaccess_name(access));
497 
498 	return 0;
499 }
500 
print_active_flags(struct env_entry * entry)501 static int print_active_flags(struct env_entry *entry)
502 {
503 	enum env_flags_vartype type;
504 	enum env_flags_varaccess access;
505 
506 	if (entry->flags == 0)
507 		return 0;
508 
509 	type = (enum env_flags_vartype)
510 		(entry->flags & ENV_FLAGS_VARTYPE_BIN_MASK);
511 	access = env_flags_parse_varaccess_from_binflags(entry->flags);
512 	printf("\t%-20s %-20s %-20s\n", entry->key,
513 		env_flags_get_vartype_name(type),
514 		env_flags_get_varaccess_name(access));
515 
516 	return 0;
517 }
518 
519 /*
520  * Print the flags available and what variables have flags
521  */
do_env_flags(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])522 int do_env_flags(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
523 {
524 	/* Print the available variable types */
525 	printf("Available variable type flags (position %d):\n",
526 		ENV_FLAGS_VARTYPE_LOC);
527 	puts("\tFlag\tVariable Type Name\n");
528 	puts("\t----\t------------------\n");
529 	env_flags_print_vartypes();
530 	puts("\n");
531 
532 	/* Print the available variable access types */
533 	printf("Available variable access flags (position %d):\n",
534 		ENV_FLAGS_VARACCESS_LOC);
535 	puts("\tFlag\tVariable Access Name\n");
536 	puts("\t----\t--------------------\n");
537 	env_flags_print_varaccess();
538 	puts("\n");
539 
540 	/* Print the static flags that may exist */
541 	puts("Static flags:\n");
542 	printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
543 		"Variable Access");
544 	printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
545 		"---------------");
546 	env_attr_walk(ENV_FLAGS_LIST_STATIC, print_static_flags, NULL);
547 	puts("\n");
548 
549 	/* walk through each variable and print the flags if non-default */
550 	puts("Active flags:\n");
551 	printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
552 		"Variable Access");
553 	printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
554 		"---------------");
555 	hwalk_r(&env_htab, print_active_flags);
556 	return 0;
557 }
558 #endif
559 
560 /*
561  * Interactively edit an environment variable
562  */
563 #if defined(CONFIG_CMD_EDITENV)
do_env_edit(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])564 static int do_env_edit(struct cmd_tbl *cmdtp, int flag, int argc,
565 		       char *const argv[])
566 {
567 	char buffer[CONFIG_SYS_CBSIZE];
568 	char *init_val;
569 
570 	if (argc < 2)
571 		return CMD_RET_USAGE;
572 
573 	/* before import into hashtable */
574 	if (!(gd->flags & GD_FLG_ENV_READY))
575 		return 1;
576 
577 	/* Set read buffer to initial value or empty sting */
578 	init_val = env_get(argv[1]);
579 	if (init_val)
580 		snprintf(buffer, CONFIG_SYS_CBSIZE, "%s", init_val);
581 	else
582 		buffer[0] = '\0';
583 
584 	if (cli_readline_into_buffer("edit: ", buffer, 0) < 0)
585 		return 1;
586 
587 	if (buffer[0] == '\0') {
588 		const char * const _argv[3] = { "setenv", argv[1], NULL };
589 
590 		return _do_env_set(0, 2, (char * const *)_argv, H_INTERACTIVE);
591 	} else {
592 		const char * const _argv[4] = { "setenv", argv[1], buffer,
593 			NULL };
594 
595 		return _do_env_set(0, 3, (char * const *)_argv, H_INTERACTIVE);
596 	}
597 }
598 #endif /* CONFIG_CMD_EDITENV */
599 
600 #if defined(CONFIG_CMD_SAVEENV) && defined(ENV_IS_IN_DEVICE)
do_env_save(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])601 static int do_env_save(struct cmd_tbl *cmdtp, int flag, int argc,
602 		       char *const argv[])
603 {
604 	return env_save() ? 1 : 0;
605 }
606 
607 U_BOOT_CMD(
608 	saveenv, 1, 0,	do_env_save,
609 	"save environment variables to persistent storage",
610 	""
611 );
612 
613 #if defined(CONFIG_CMD_ERASEENV)
do_env_erase(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])614 static int do_env_erase(struct cmd_tbl *cmdtp, int flag, int argc,
615 			char *const argv[])
616 {
617 	return env_erase() ? 1 : 0;
618 }
619 
620 U_BOOT_CMD(
621 	eraseenv, 1, 0,	do_env_erase,
622 	"erase environment variables from persistent storage",
623 	""
624 );
625 #endif
626 #endif
627 
628 #if defined(CONFIG_CMD_NVEDIT_LOAD)
do_env_load(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])629 static int do_env_load(struct cmd_tbl *cmdtp, int flag, int argc,
630 		       char *const argv[])
631 {
632 	return env_reload() ? 1 : 0;
633 }
634 #endif
635 
636 #if defined(CONFIG_CMD_NVEDIT_SELECT)
do_env_select(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])637 static int do_env_select(struct cmd_tbl *cmdtp, int flag, int argc,
638 			 char *const argv[])
639 {
640 	return env_select(argv[1]) ? 1 : 0;
641 }
642 #endif
643 
644 #endif /* CONFIG_SPL_BUILD */
645 
646 #ifndef CONFIG_SPL_BUILD
do_env_default(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])647 static int do_env_default(struct cmd_tbl *cmdtp, int flag,
648 			  int argc, char *const argv[])
649 {
650 	int all = 0, env_flag = H_INTERACTIVE;
651 
652 	debug("Initial value for argc=%d\n", argc);
653 	while (--argc > 0 && **++argv == '-') {
654 		char *arg = *argv;
655 
656 		while (*++arg) {
657 			switch (*arg) {
658 			case 'a':		/* default all */
659 				all = 1;
660 				break;
661 			case 'f':		/* force */
662 				env_flag |= H_FORCE;
663 				break;
664 			default:
665 				return cmd_usage(cmdtp);
666 			}
667 		}
668 	}
669 	debug("Final value for argc=%d\n", argc);
670 	if (all && (argc == 0)) {
671 		/* Reset the whole environment */
672 		env_set_default("## Resetting to default environment\n",
673 				env_flag);
674 		return 0;
675 	}
676 	if (!all && (argc > 0)) {
677 		/* Reset individual variables */
678 		env_set_default_vars(argc, argv, env_flag);
679 		return 0;
680 	}
681 
682 	return cmd_usage(cmdtp);
683 }
684 
do_env_delete(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])685 static int do_env_delete(struct cmd_tbl *cmdtp, int flag,
686 			 int argc, char *const argv[])
687 {
688 	int env_flag = H_INTERACTIVE;
689 	int ret = 0;
690 
691 	debug("Initial value for argc=%d\n", argc);
692 	while (argc > 1 && **(argv + 1) == '-') {
693 		char *arg = *++argv;
694 
695 		--argc;
696 		while (*++arg) {
697 			switch (*arg) {
698 			case 'f':		/* force */
699 				env_flag |= H_FORCE;
700 				break;
701 			default:
702 				return CMD_RET_USAGE;
703 			}
704 		}
705 	}
706 	debug("Final value for argc=%d\n", argc);
707 
708 	env_id++;
709 
710 	while (--argc > 0) {
711 		char *name = *++argv;
712 
713 		if (hdelete_r(name, &env_htab, env_flag))
714 			ret = 1;
715 	}
716 
717 	return ret;
718 }
719 
720 #ifdef CONFIG_CMD_EXPORTENV
721 /*
722  * env export [-t | -b | -c] [-s size] addr [var ...]
723  *	-t:	export as text format; if size is given, data will be
724  *		padded with '\0' bytes; if not, one terminating '\0'
725  *		will be added (which is included in the "filesize"
726  *		setting so you can for exmple copy this to flash and
727  *		keep the termination).
728  *	-b:	export as binary format (name=value pairs separated by
729  *		'\0', list end marked by double "\0\0")
730  *	-c:	export as checksum protected environment format as
731  *		used for example by "saveenv" command
732  *	-s size:
733  *		size of output buffer
734  *	addr:	memory address where environment gets stored
735  *	var...	List of variable names that get included into the
736  *		export. Without arguments, the whole environment gets
737  *		exported.
738  *
739  * With "-c" and size is NOT given, then the export command will
740  * format the data as currently used for the persistent storage,
741  * i. e. it will use CONFIG_ENV_SECT_SIZE as output block size and
742  * prepend a valid CRC32 checksum and, in case of redundant
743  * environment, a "current" redundancy flag. If size is given, this
744  * value will be used instead of CONFIG_ENV_SECT_SIZE; again, CRC32
745  * checksum and redundancy flag will be inserted.
746  *
747  * With "-b" and "-t", always only the real data (including a
748  * terminating '\0' byte) will be written; here the optional size
749  * argument will be used to make sure not to overflow the user
750  * provided buffer; the command will abort if the size is not
751  * sufficient. Any remaining space will be '\0' padded.
752  *
753  * On successful return, the variable "filesize" will be set.
754  * Note that filesize includes the trailing/terminating '\0' byte(s).
755  *
756  * Usage scenario:  create a text snapshot/backup of the current settings:
757  *
758  *	=> env export -t 100000
759  *	=> era ${backup_addr} +${filesize}
760  *	=> cp.b 100000 ${backup_addr} ${filesize}
761  *
762  * Re-import this snapshot, deleting all other settings:
763  *
764  *	=> env import -d -t ${backup_addr}
765  */
do_env_export(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])766 static int do_env_export(struct cmd_tbl *cmdtp, int flag,
767 			 int argc, char *const argv[])
768 {
769 	char	buf[32];
770 	ulong	addr;
771 	char	*ptr, *cmd, *res;
772 	size_t	size = 0;
773 	ssize_t	len;
774 	env_t	*envp;
775 	char	sep = '\n';
776 	int	chk = 0;
777 	int	fmt = 0;
778 
779 	cmd = *argv;
780 
781 	while (--argc > 0 && **++argv == '-') {
782 		char *arg = *argv;
783 		while (*++arg) {
784 			switch (*arg) {
785 			case 'b':		/* raw binary format */
786 				if (fmt++)
787 					goto sep_err;
788 				sep = '\0';
789 				break;
790 			case 'c':		/* external checksum format */
791 				if (fmt++)
792 					goto sep_err;
793 				sep = '\0';
794 				chk = 1;
795 				break;
796 			case 's':		/* size given */
797 				if (--argc <= 0)
798 					return cmd_usage(cmdtp);
799 				size = hextoul(*++argv, NULL);
800 				goto NXTARG;
801 			case 't':		/* text format */
802 				if (fmt++)
803 					goto sep_err;
804 				sep = '\n';
805 				break;
806 			default:
807 				return CMD_RET_USAGE;
808 			}
809 		}
810 NXTARG:		;
811 	}
812 
813 	if (argc < 1)
814 		return CMD_RET_USAGE;
815 
816 	addr = hextoul(argv[0], NULL);
817 	ptr = map_sysmem(addr, size);
818 
819 	if (size)
820 		memset(ptr, '\0', size);
821 
822 	argc--;
823 	argv++;
824 
825 	if (sep) {		/* export as text file */
826 		len = hexport_r(&env_htab, sep,
827 				H_MATCH_KEY | H_MATCH_IDENT,
828 				&ptr, size, argc, argv);
829 		if (len < 0) {
830 			pr_err("## Error: Cannot export environment: errno = %d\n",
831 			       errno);
832 			return 1;
833 		}
834 		sprintf(buf, "%zX", (size_t)len);
835 		env_set("filesize", buf);
836 
837 		return 0;
838 	}
839 
840 	envp = (env_t *)ptr;
841 
842 	if (chk)		/* export as checksum protected block */
843 		res = (char *)envp->data;
844 	else			/* export as raw binary data */
845 		res = ptr;
846 
847 	len = hexport_r(&env_htab, '\0',
848 			H_MATCH_KEY | H_MATCH_IDENT,
849 			&res, ENV_SIZE, argc, argv);
850 	if (len < 0) {
851 		pr_err("## Error: Cannot export environment: errno = %d\n",
852 		       errno);
853 		return 1;
854 	}
855 
856 	if (chk) {
857 		envp->crc = crc32(0, envp->data,
858 				size ? size - offsetof(env_t, data) : ENV_SIZE);
859 #ifdef CONFIG_ENV_ADDR_REDUND
860 		envp->flags = ENV_REDUND_ACTIVE;
861 #endif
862 	}
863 	env_set_hex("filesize", len + offsetof(env_t, data));
864 
865 	return 0;
866 
867 sep_err:
868 	printf("## Error: %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
869 	       cmd);
870 	return 1;
871 }
872 #endif
873 
874 #ifdef CONFIG_CMD_IMPORTENV
875 /*
876  * env import [-d] [-t [-r] | -b | -c] addr [size] [var ...]
877  *	-d:	delete existing environment before importing if no var is
878  *		passed; if vars are passed, if one var is in the current
879  *		environment but not in the environment at addr, delete var from
880  *		current environment;
881  *		otherwise overwrite / append to existing definitions
882  *	-t:	assume text format; either "size" must be given or the
883  *		text data must be '\0' terminated
884  *	-r:	handle CRLF like LF, that means exported variables with
885  *		a content which ends with \r won't get imported. Used
886  *		to import text files created with editors which are using CRLF
887  *		for line endings. Only effective in addition to -t.
888  *	-b:	assume binary format ('\0' separated, "\0\0" terminated)
889  *	-c:	assume checksum protected environment format
890  *	addr:	memory address to read from
891  *	size:	length of input data; if missing, proper '\0'
892  *		termination is mandatory
893  *		if var is set and size should be missing (i.e. '\0'
894  *		termination), set size to '-'
895  *	var...	List of the names of the only variables that get imported from
896  *		the environment at address 'addr'. Without arguments, the whole
897  *		environment gets imported.
898  */
do_env_import(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])899 static int do_env_import(struct cmd_tbl *cmdtp, int flag,
900 			 int argc, char *const argv[])
901 {
902 	ulong	addr;
903 	char	*cmd, *ptr;
904 	char	sep = '\n';
905 	int	chk = 0;
906 	int	fmt = 0;
907 	int	del = 0;
908 	int	crlf_is_lf = 0;
909 	int	wl = 0;
910 	size_t	size;
911 
912 	cmd = *argv;
913 
914 	while (--argc > 0 && **++argv == '-') {
915 		char *arg = *argv;
916 		while (*++arg) {
917 			switch (*arg) {
918 			case 'b':		/* raw binary format */
919 				if (fmt++)
920 					goto sep_err;
921 				sep = '\0';
922 				break;
923 			case 'c':		/* external checksum format */
924 				if (fmt++)
925 					goto sep_err;
926 				sep = '\0';
927 				chk = 1;
928 				break;
929 			case 't':		/* text format */
930 				if (fmt++)
931 					goto sep_err;
932 				sep = '\n';
933 				break;
934 			case 'r':		/* handle CRLF like LF */
935 				crlf_is_lf = 1;
936 				break;
937 			case 'd':
938 				del = 1;
939 				break;
940 			default:
941 				return CMD_RET_USAGE;
942 			}
943 		}
944 	}
945 
946 	if (argc < 1)
947 		return CMD_RET_USAGE;
948 
949 	if (!fmt)
950 		printf("## Warning: defaulting to text format\n");
951 
952 	if (sep != '\n' && crlf_is_lf )
953 		crlf_is_lf = 0;
954 
955 	addr = hextoul(argv[0], NULL);
956 	ptr = map_sysmem(addr, 0);
957 
958 	if (argc >= 2 && strcmp(argv[1], "-")) {
959 		size = hextoul(argv[1], NULL);
960 	} else if (chk) {
961 		puts("## Error: external checksum format must pass size\n");
962 		return CMD_RET_FAILURE;
963 	} else {
964 		char *s = ptr;
965 
966 		size = 0;
967 
968 		while (size < MAX_ENV_SIZE) {
969 			if ((*s == sep) && (*(s+1) == '\0'))
970 				break;
971 			++s;
972 			++size;
973 		}
974 		if (size == MAX_ENV_SIZE) {
975 			printf("## Warning: Input data exceeds %d bytes"
976 				" - truncated\n", MAX_ENV_SIZE);
977 		}
978 		size += 2;
979 		printf("## Info: input data size = %zu = 0x%zX\n", size, size);
980 	}
981 
982 	if (argc > 2)
983 		wl = 1;
984 
985 	if (chk) {
986 		uint32_t crc;
987 		env_t *ep = (env_t *)ptr;
988 
989 		if (size <= offsetof(env_t, data)) {
990 			printf("## Error: Invalid size 0x%zX\n", size);
991 			return 1;
992 		}
993 
994 		size -= offsetof(env_t, data);
995 		memcpy(&crc, &ep->crc, sizeof(crc));
996 
997 		if (crc32(0, ep->data, size) != crc) {
998 			puts("## Error: bad CRC, import failed\n");
999 			return 1;
1000 		}
1001 		ptr = (char *)ep->data;
1002 	}
1003 
1004 	if (!himport_r(&env_htab, ptr, size, sep, del ? 0 : H_NOCLEAR,
1005 		       crlf_is_lf, wl ? argc - 2 : 0, wl ? &argv[2] : NULL)) {
1006 		pr_err("## Error: Environment import failed: errno = %d\n",
1007 		       errno);
1008 		return 1;
1009 	}
1010 	gd->flags |= GD_FLG_ENV_READY;
1011 
1012 	return 0;
1013 
1014 sep_err:
1015 	printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
1016 		cmd);
1017 	return 1;
1018 }
1019 #endif
1020 
1021 #if defined(CONFIG_CMD_NVEDIT_INFO)
1022 /*
1023  * print_env_info - print environment information
1024  */
print_env_info(void)1025 static int print_env_info(void)
1026 {
1027 	const char *value;
1028 
1029 	/* print environment validity value */
1030 	switch (gd->env_valid) {
1031 	case ENV_INVALID:
1032 		value = "invalid";
1033 		break;
1034 	case ENV_VALID:
1035 		value = "valid";
1036 		break;
1037 	case ENV_REDUND:
1038 		value = "redundant";
1039 		break;
1040 	default:
1041 		value = "unknown";
1042 		break;
1043 	}
1044 	printf("env_valid = %s\n", value);
1045 
1046 	/* print environment ready flag */
1047 	value = gd->flags & GD_FLG_ENV_READY ? "true" : "false";
1048 	printf("env_ready = %s\n", value);
1049 
1050 	/* print environment using default flag */
1051 	value = gd->flags & GD_FLG_ENV_DEFAULT ? "true" : "false";
1052 	printf("env_use_default = %s\n", value);
1053 
1054 	return CMD_RET_SUCCESS;
1055 }
1056 
1057 #define ENV_INFO_IS_DEFAULT	BIT(0) /* default environment bit mask */
1058 #define ENV_INFO_IS_PERSISTED	BIT(1) /* environment persistence bit mask */
1059 
1060 /*
1061  * env info - display environment information
1062  * env info [-d] - evaluate whether default environment is used
1063  * env info [-p] - evaluate whether environment can be persisted
1064  *      Add [-q] - quiet mode, use only for command result, for test by example:
1065  *                 test env info -p -d -q
1066  */
do_env_info(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])1067 static int do_env_info(struct cmd_tbl *cmdtp, int flag,
1068 		       int argc, char *const argv[])
1069 {
1070 	int eval_flags = 0;
1071 	int eval_results = 0;
1072 	bool quiet = false;
1073 #if defined(CONFIG_CMD_SAVEENV) && defined(ENV_IS_IN_DEVICE)
1074 	enum env_location loc;
1075 #endif
1076 
1077 	/* display environment information */
1078 	if (argc <= 1)
1079 		return print_env_info();
1080 
1081 	/* process options */
1082 	while (--argc > 0 && **++argv == '-') {
1083 		char *arg = *argv;
1084 
1085 		while (*++arg) {
1086 			switch (*arg) {
1087 			case 'd':
1088 				eval_flags |= ENV_INFO_IS_DEFAULT;
1089 				break;
1090 			case 'p':
1091 				eval_flags |= ENV_INFO_IS_PERSISTED;
1092 				break;
1093 			case 'q':
1094 				quiet = true;
1095 				break;
1096 			default:
1097 				return CMD_RET_USAGE;
1098 			}
1099 		}
1100 	}
1101 
1102 	/* evaluate whether default environment is used */
1103 	if (eval_flags & ENV_INFO_IS_DEFAULT) {
1104 		if (gd->flags & GD_FLG_ENV_DEFAULT) {
1105 			if (!quiet)
1106 				printf("Default environment is used\n");
1107 			eval_results |= ENV_INFO_IS_DEFAULT;
1108 		} else {
1109 			if (!quiet)
1110 				printf("Environment was loaded from persistent storage\n");
1111 		}
1112 	}
1113 
1114 	/* evaluate whether environment can be persisted */
1115 	if (eval_flags & ENV_INFO_IS_PERSISTED) {
1116 #if defined(CONFIG_CMD_SAVEENV) && defined(ENV_IS_IN_DEVICE)
1117 		loc = env_get_location(ENVOP_SAVE, gd->env_load_prio);
1118 		if (ENVL_NOWHERE != loc && ENVL_UNKNOWN != loc) {
1119 			if (!quiet)
1120 				printf("Environment can be persisted\n");
1121 			eval_results |= ENV_INFO_IS_PERSISTED;
1122 		} else {
1123 			if (!quiet)
1124 				printf("Environment cannot be persisted\n");
1125 		}
1126 #else
1127 		if (!quiet)
1128 			printf("Environment cannot be persisted\n");
1129 #endif
1130 	}
1131 
1132 	/* The result of evaluations is combined with AND */
1133 	if (eval_flags != eval_results)
1134 		return CMD_RET_FAILURE;
1135 
1136 	return CMD_RET_SUCCESS;
1137 }
1138 #endif
1139 
1140 #if defined(CONFIG_CMD_ENV_EXISTS)
do_env_exists(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])1141 static int do_env_exists(struct cmd_tbl *cmdtp, int flag, int argc,
1142 			 char *const argv[])
1143 {
1144 	struct env_entry e, *ep;
1145 
1146 	if (argc < 2)
1147 		return CMD_RET_USAGE;
1148 
1149 	e.key = argv[1];
1150 	e.data = NULL;
1151 	hsearch_r(e, ENV_FIND, &ep, &env_htab, 0);
1152 
1153 	return (ep == NULL) ? 1 : 0;
1154 }
1155 #endif
1156 
1157 /*
1158  * New command line interface: "env" command with subcommands
1159  */
1160 static struct cmd_tbl cmd_env_sub[] = {
1161 #if defined(CONFIG_CMD_ASKENV)
1162 	U_BOOT_CMD_MKENT(ask, CONFIG_SYS_MAXARGS, 1, do_env_ask, "", ""),
1163 #endif
1164 	U_BOOT_CMD_MKENT(default, 1, 0, do_env_default, "", ""),
1165 	U_BOOT_CMD_MKENT(delete, CONFIG_SYS_MAXARGS, 0, do_env_delete, "", ""),
1166 #if defined(CONFIG_CMD_EDITENV)
1167 	U_BOOT_CMD_MKENT(edit, 2, 0, do_env_edit, "", ""),
1168 #endif
1169 #if defined(CONFIG_CMD_ENV_CALLBACK)
1170 	U_BOOT_CMD_MKENT(callbacks, 1, 0, do_env_callback, "", ""),
1171 #endif
1172 #if defined(CONFIG_CMD_ENV_FLAGS)
1173 	U_BOOT_CMD_MKENT(flags, 1, 0, do_env_flags, "", ""),
1174 #endif
1175 #if defined(CONFIG_CMD_EXPORTENV)
1176 	U_BOOT_CMD_MKENT(export, 4, 0, do_env_export, "", ""),
1177 #endif
1178 #if defined(CONFIG_CMD_GREPENV)
1179 	U_BOOT_CMD_MKENT(grep, CONFIG_SYS_MAXARGS, 1, do_env_grep, "", ""),
1180 #endif
1181 #if defined(CONFIG_CMD_IMPORTENV)
1182 	U_BOOT_CMD_MKENT(import, 5, 0, do_env_import, "", ""),
1183 #endif
1184 #if defined(CONFIG_CMD_NVEDIT_INFO)
1185 	U_BOOT_CMD_MKENT(info, 3, 0, do_env_info, "", ""),
1186 #endif
1187 #if defined(CONFIG_CMD_NVEDIT_LOAD)
1188 	U_BOOT_CMD_MKENT(load, 1, 0, do_env_load, "", ""),
1189 #endif
1190 	U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
1191 #if defined(CONFIG_CMD_RUN)
1192 	U_BOOT_CMD_MKENT(run, CONFIG_SYS_MAXARGS, 1, do_run, "", ""),
1193 #endif
1194 #if defined(CONFIG_CMD_SAVEENV) && defined(ENV_IS_IN_DEVICE)
1195 	U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
1196 #if defined(CONFIG_CMD_ERASEENV)
1197 	U_BOOT_CMD_MKENT(erase, 1, 0, do_env_erase, "", ""),
1198 #endif
1199 #endif
1200 #if defined(CONFIG_CMD_NVEDIT_SELECT)
1201 	U_BOOT_CMD_MKENT(select, 2, 0, do_env_select, "", ""),
1202 #endif
1203 	U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
1204 #if defined(CONFIG_CMD_ENV_EXISTS)
1205 	U_BOOT_CMD_MKENT(exists, 2, 0, do_env_exists, "", ""),
1206 #endif
1207 };
1208 
1209 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
env_reloc(void)1210 void env_reloc(void)
1211 {
1212 	fixup_cmdtable(cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1213 }
1214 #endif
1215 
do_env(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])1216 static int do_env(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
1217 {
1218 	struct cmd_tbl *cp;
1219 
1220 	if (argc < 2)
1221 		return CMD_RET_USAGE;
1222 
1223 	/* drop initial "env" arg */
1224 	argc--;
1225 	argv++;
1226 
1227 	cp = find_cmd_tbl(argv[0], cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1228 
1229 	if (cp)
1230 		return cp->cmd(cmdtp, flag, argc, argv);
1231 
1232 	return CMD_RET_USAGE;
1233 }
1234 
1235 #ifdef CONFIG_SYS_LONGHELP
1236 static char env_help_text[] =
1237 #if defined(CONFIG_CMD_ASKENV)
1238 	"ask name [message] [size] - ask for environment variable\nenv "
1239 #endif
1240 #if defined(CONFIG_CMD_ENV_CALLBACK)
1241 	"callbacks - print callbacks and their associated variables\nenv "
1242 #endif
1243 	"default [-f] -a - [forcibly] reset default environment\n"
1244 	"env default [-f] var [...] - [forcibly] reset variable(s) to their default values\n"
1245 	"env delete [-f] var [...] - [forcibly] delete variable(s)\n"
1246 #if defined(CONFIG_CMD_EDITENV)
1247 	"env edit name - edit environment variable\n"
1248 #endif
1249 #if defined(CONFIG_CMD_ENV_EXISTS)
1250 	"env exists name - tests for existence of variable\n"
1251 #endif
1252 #if defined(CONFIG_CMD_EXPORTENV)
1253 	"env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
1254 #endif
1255 #if defined(CONFIG_CMD_ENV_FLAGS)
1256 	"env flags - print variables that have non-default flags\n"
1257 #endif
1258 #if defined(CONFIG_CMD_GREPENV)
1259 #ifdef CONFIG_REGEX
1260 	"env grep [-e] [-n | -v | -b] string [...] - search environment\n"
1261 #else
1262 	"env grep [-n | -v | -b] string [...] - search environment\n"
1263 #endif
1264 #endif
1265 #if defined(CONFIG_CMD_IMPORTENV)
1266 	"env import [-d] [-t [-r] | -b | -c] addr [size] [var ...] - import environment\n"
1267 #endif
1268 #if defined(CONFIG_CMD_NVEDIT_INFO)
1269 	"env info - display environment information\n"
1270 	"env info [-d] [-p] [-q] - evaluate environment information\n"
1271 	"      \"-d\": default environment is used\n"
1272 	"      \"-p\": environment can be persisted\n"
1273 	"      \"-q\": quiet output\n"
1274 #endif
1275 	"env print [-a | name ...] - print environment\n"
1276 #if defined(CONFIG_CMD_NVEDIT_EFI)
1277 	"env print -e [-guid guid] [-n] [name ...] - print UEFI environment\n"
1278 #endif
1279 #if defined(CONFIG_CMD_RUN)
1280 	"env run var [...] - run commands in an environment variable\n"
1281 #endif
1282 #if defined(CONFIG_CMD_SAVEENV) && defined(ENV_IS_IN_DEVICE)
1283 	"env save - save environment\n"
1284 #if defined(CONFIG_CMD_ERASEENV)
1285 	"env erase - erase environment\n"
1286 #endif
1287 #endif
1288 #if defined(CONFIG_CMD_NVEDIT_LOAD)
1289 	"env load - load environment\n"
1290 #endif
1291 #if defined(CONFIG_CMD_NVEDIT_SELECT)
1292 	"env select [target] - select environment target\n"
1293 #endif
1294 #if defined(CONFIG_CMD_NVEDIT_EFI)
1295 	"env set -e [-nv][-bs][-rt][-at][-a][-i addr:size][-v] name [arg ...]\n"
1296 	"    - set UEFI variable; unset if '-i' or 'arg' not specified\n"
1297 #endif
1298 	"env set [-f] name [arg ...]\n";
1299 #endif
1300 
1301 U_BOOT_CMD(
1302 	env, CONFIG_SYS_MAXARGS, 1, do_env,
1303 	"environment handling commands", env_help_text
1304 );
1305 
1306 /*
1307  * Old command line interface, kept for compatibility
1308  */
1309 
1310 #if defined(CONFIG_CMD_EDITENV)
1311 U_BOOT_CMD_COMPLETE(
1312 	editenv, 2, 0,	do_env_edit,
1313 	"edit environment variable",
1314 	"name\n"
1315 	"    - edit environment variable 'name'",
1316 	var_complete
1317 );
1318 #endif
1319 
1320 U_BOOT_CMD_COMPLETE(
1321 	printenv, CONFIG_SYS_MAXARGS, 1,	do_env_print,
1322 	"print environment variables",
1323 	"[-a]\n    - print [all] values of all environment variables\n"
1324 #if defined(CONFIG_CMD_NVEDIT_EFI)
1325 	"printenv -e [-guid guid][-n] [name ...]\n"
1326 	"    - print UEFI variable 'name' or all the variables\n"
1327 	"      \"-guid\": GUID xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx\n"
1328 	"      \"-n\": suppress dumping variable's value\n"
1329 #endif
1330 	"printenv name ...\n"
1331 	"    - print value of environment variable 'name'",
1332 	var_complete
1333 );
1334 
1335 #ifdef CONFIG_CMD_GREPENV
1336 U_BOOT_CMD_COMPLETE(
1337 	grepenv, CONFIG_SYS_MAXARGS, 0,  do_env_grep,
1338 	"search environment variables",
1339 #ifdef CONFIG_REGEX
1340 	"[-e] [-n | -v | -b] string ...\n"
1341 #else
1342 	"[-n | -v | -b] string ...\n"
1343 #endif
1344 	"    - list environment name=value pairs matching 'string'\n"
1345 #ifdef CONFIG_REGEX
1346 	"      \"-e\": enable regular expressions;\n"
1347 #endif
1348 	"      \"-n\": search variable names; \"-v\": search values;\n"
1349 	"      \"-b\": search both names and values (default)",
1350 	var_complete
1351 );
1352 #endif
1353 
1354 U_BOOT_CMD_COMPLETE(
1355 	setenv, CONFIG_SYS_MAXARGS, 0,	do_env_set,
1356 	"set environment variables",
1357 #if defined(CONFIG_CMD_NVEDIT_EFI)
1358 	"-e [-guid guid][-nv][-bs][-rt][-at][-a][-v]\n"
1359 	"        [-i addr:size name], or [name [value ...]]\n"
1360 	"    - set UEFI variable 'name' to 'value' ...'\n"
1361 	"      \"-guid\": GUID xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx\n"
1362 	"      \"-nv\": set non-volatile attribute\n"
1363 	"      \"-bs\": set boot-service attribute\n"
1364 	"      \"-rt\": set runtime attribute\n"
1365 	"      \"-at\": set time-based authentication attribute\n"
1366 	"      \"-a\": append-write\n"
1367 	"      \"-i addr,size\": use <addr,size> as variable's value\n"
1368 	"      \"-v\": verbose message\n"
1369 	"    - delete UEFI variable 'name' if 'value' not specified\n"
1370 #endif
1371 	"setenv [-f] name value ...\n"
1372 	"    - [forcibly] set environment variable 'name' to 'value ...'\n"
1373 	"setenv [-f] name\n"
1374 	"    - [forcibly] delete environment variable 'name'",
1375 	var_complete
1376 );
1377 
1378 #if defined(CONFIG_CMD_ASKENV)
1379 
1380 U_BOOT_CMD(
1381 	askenv,	CONFIG_SYS_MAXARGS,	1,	do_env_ask,
1382 	"get environment variables from stdin",
1383 	"name [message] [size]\n"
1384 	"    - get environment variable 'name' from stdin (max 'size' chars)"
1385 );
1386 #endif
1387 
1388 #if defined(CONFIG_CMD_RUN)
1389 U_BOOT_CMD_COMPLETE(
1390 	run,	CONFIG_SYS_MAXARGS,	1,	do_run,
1391 	"run commands in an environment variable",
1392 	"var [...]\n"
1393 	"    - run the commands in the environment variable(s) 'var'",
1394 	var_complete
1395 );
1396 #endif
1397 #endif /* CONFIG_SPL_BUILD */
1398