xref: /openbmc/u-boot/cmd/nvedit.c (revision fc76fa3c) 
1 /*
2  * (C) Copyright 2000-2013
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
6  * Andreas Heppel <aheppel@sysgo.de>
7  *
8  * Copyright 2011 Freescale Semiconductor, Inc.
9  *
10  * SPDX-License-Identifier:	GPL-2.0+
11  */
12 
13 /*
14  * Support for persistent environment data
15  *
16  * The "environment" is stored on external storage as a list of '\0'
17  * terminated "name=value" strings. The end of the list is marked by
18  * a double '\0'. The environment is preceded by a 32 bit CRC over
19  * the data part and, in case of redundant environment, a byte of
20  * flags.
21  *
22  * This linearized representation will also be used before
23  * relocation, i. e. as long as we don't have a full C runtime
24  * environment. After that, we use a hash table.
25  */
26 
27 #include <common.h>
28 #include <cli.h>
29 #include <command.h>
30 #include <console.h>
31 #include <environment.h>
32 #include <search.h>
33 #include <errno.h>
34 #include <malloc.h>
35 #include <mapmem.h>
36 #include <watchdog.h>
37 #include <linux/stddef.h>
38 #include <asm/byteorder.h>
39 #include <asm/io.h>
40 
41 DECLARE_GLOBAL_DATA_PTR;
42 
43 #if	!defined(CONFIG_ENV_IS_IN_EEPROM)	&& \
44 	!defined(CONFIG_ENV_IS_IN_FLASH)	&& \
45 	!defined(CONFIG_ENV_IS_IN_MMC)		&& \
46 	!defined(CONFIG_ENV_IS_IN_FAT)		&& \
47 	!defined(CONFIG_ENV_IS_IN_EXT4)		&& \
48 	!defined(CONFIG_ENV_IS_IN_NAND)		&& \
49 	!defined(CONFIG_ENV_IS_IN_NVRAM)	&& \
50 	!defined(CONFIG_ENV_IS_IN_ONENAND)	&& \
51 	!defined(CONFIG_ENV_IS_IN_SATA)		&& \
52 	!defined(CONFIG_ENV_IS_IN_SPI_FLASH)	&& \
53 	!defined(CONFIG_ENV_IS_IN_REMOTE)	&& \
54 	!defined(CONFIG_ENV_IS_IN_UBI)		&& \
55 	!defined(CONFIG_ENV_IS_NOWHERE)
56 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|MMC|FAT|EXT4|\
57 NAND|NVRAM|ONENAND|SATA|SPI_FLASH|REMOTE|UBI} or CONFIG_ENV_IS_NOWHERE
58 #endif
59 
60 /*
61  * Maximum expected input data size for import command
62  */
63 #define	MAX_ENV_SIZE	(1 << 20)	/* 1 MiB */
64 
65 /*
66  * This variable is incremented on each do_env_set(), so it can
67  * be used via get_env_id() as an indication, if the environment
68  * has changed or not. So it is possible to reread an environment
69  * variable only if the environment was changed ... done so for
70  * example in NetInitLoop()
71  */
72 static int env_id = 1;
73 
74 int get_env_id(void)
75 {
76 	return env_id;
77 }
78 
79 #ifndef CONFIG_SPL_BUILD
80 /*
81  * Command interface: print one or all environment variables
82  *
83  * Returns 0 in case of error, or length of printed string
84  */
85 static int env_print(char *name, int flag)
86 {
87 	char *res = NULL;
88 	ssize_t len;
89 
90 	if (name) {		/* print a single name */
91 		ENTRY e, *ep;
92 
93 		e.key = name;
94 		e.data = NULL;
95 		hsearch_r(e, FIND, &ep, &env_htab, flag);
96 		if (ep == NULL)
97 			return 0;
98 		len = printf("%s=%s\n", ep->key, ep->data);
99 		return len;
100 	}
101 
102 	/* print whole list */
103 	len = hexport_r(&env_htab, '\n', flag, &res, 0, 0, NULL);
104 
105 	if (len > 0) {
106 		puts(res);
107 		free(res);
108 		return len;
109 	}
110 
111 	/* should never happen */
112 	printf("## Error: cannot export environment\n");
113 	return 0;
114 }
115 
116 static int do_env_print(cmd_tbl_t *cmdtp, int flag, int argc,
117 			char * const argv[])
118 {
119 	int i;
120 	int rcode = 0;
121 	int env_flag = H_HIDE_DOT;
122 
123 	if (argc > 1 && argv[1][0] == '-' && argv[1][1] == 'a') {
124 		argc--;
125 		argv++;
126 		env_flag &= ~H_HIDE_DOT;
127 	}
128 
129 	if (argc == 1) {
130 		/* print all env vars */
131 		rcode = env_print(NULL, env_flag);
132 		if (!rcode)
133 			return 1;
134 		printf("\nEnvironment size: %d/%ld bytes\n",
135 			rcode, (ulong)ENV_SIZE);
136 		return 0;
137 	}
138 
139 	/* print selected env vars */
140 	env_flag &= ~H_HIDE_DOT;
141 	for (i = 1; i < argc; ++i) {
142 		int rc = env_print(argv[i], env_flag);
143 		if (!rc) {
144 			printf("## Error: \"%s\" not defined\n", argv[i]);
145 			++rcode;
146 		}
147 	}
148 
149 	return rcode;
150 }
151 
152 #ifdef CONFIG_CMD_GREPENV
153 static int do_env_grep(cmd_tbl_t *cmdtp, int flag,
154 		       int argc, char * const argv[])
155 {
156 	char *res = NULL;
157 	int len, grep_how, grep_what;
158 
159 	if (argc < 2)
160 		return CMD_RET_USAGE;
161 
162 	grep_how  = H_MATCH_SUBSTR;	/* default: substring search	*/
163 	grep_what = H_MATCH_BOTH;	/* default: grep names and values */
164 
165 	while (--argc > 0 && **++argv == '-') {
166 		char *arg = *argv;
167 		while (*++arg) {
168 			switch (*arg) {
169 #ifdef CONFIG_REGEX
170 			case 'e':		/* use regex matching */
171 				grep_how  = H_MATCH_REGEX;
172 				break;
173 #endif
174 			case 'n':		/* grep for name */
175 				grep_what = H_MATCH_KEY;
176 				break;
177 			case 'v':		/* grep for value */
178 				grep_what = H_MATCH_DATA;
179 				break;
180 			case 'b':		/* grep for both */
181 				grep_what = H_MATCH_BOTH;
182 				break;
183 			case '-':
184 				goto DONE;
185 			default:
186 				return CMD_RET_USAGE;
187 			}
188 		}
189 	}
190 
191 DONE:
192 	len = hexport_r(&env_htab, '\n',
193 			flag | grep_what | grep_how,
194 			&res, 0, argc, argv);
195 
196 	if (len > 0) {
197 		puts(res);
198 		free(res);
199 	}
200 
201 	if (len < 2)
202 		return 1;
203 
204 	return 0;
205 }
206 #endif
207 #endif /* CONFIG_SPL_BUILD */
208 
209 /*
210  * Set a new environment variable,
211  * or replace or delete an existing one.
212  */
213 static int _do_env_set(int flag, int argc, char * const argv[], int env_flag)
214 {
215 	int   i, len;
216 	char  *name, *value, *s;
217 	ENTRY e, *ep;
218 
219 	debug("Initial value for argc=%d\n", argc);
220 	while (argc > 1 && **(argv + 1) == '-') {
221 		char *arg = *++argv;
222 
223 		--argc;
224 		while (*++arg) {
225 			switch (*arg) {
226 			case 'f':		/* force */
227 				env_flag |= H_FORCE;
228 				break;
229 			default:
230 				return CMD_RET_USAGE;
231 			}
232 		}
233 	}
234 	debug("Final value for argc=%d\n", argc);
235 	name = argv[1];
236 
237 	if (strchr(name, '=')) {
238 		printf("## Error: illegal character '='"
239 		       "in variable name \"%s\"\n", name);
240 		return 1;
241 	}
242 
243 	env_id++;
244 
245 	/* Delete only ? */
246 	if (argc < 3 || argv[2] == NULL) {
247 		int rc = hdelete_r(name, &env_htab, env_flag);
248 		return !rc;
249 	}
250 
251 	/*
252 	 * Insert / replace new value
253 	 */
254 	for (i = 2, len = 0; i < argc; ++i)
255 		len += strlen(argv[i]) + 1;
256 
257 	value = malloc(len);
258 	if (value == NULL) {
259 		printf("## Can't malloc %d bytes\n", len);
260 		return 1;
261 	}
262 	for (i = 2, s = value; i < argc; ++i) {
263 		char *v = argv[i];
264 
265 		while ((*s++ = *v++) != '\0')
266 			;
267 		*(s - 1) = ' ';
268 	}
269 	if (s != value)
270 		*--s = '\0';
271 
272 	e.key	= name;
273 	e.data	= value;
274 	hsearch_r(e, ENTER, &ep, &env_htab, env_flag);
275 	free(value);
276 	if (!ep) {
277 		printf("## Error inserting \"%s\" variable, errno=%d\n",
278 			name, errno);
279 		return 1;
280 	}
281 
282 	return 0;
283 }
284 
285 int env_set(const char *varname, const char *varvalue)
286 {
287 	const char * const argv[4] = { "setenv", varname, varvalue, NULL };
288 
289 	/* before import into hashtable */
290 	if (!(gd->flags & GD_FLG_ENV_READY))
291 		return 1;
292 
293 	if (varvalue == NULL || varvalue[0] == '\0')
294 		return _do_env_set(0, 2, (char * const *)argv, H_PROGRAMMATIC);
295 	else
296 		return _do_env_set(0, 3, (char * const *)argv, H_PROGRAMMATIC);
297 }
298 
299 /**
300  * Set an environment variable to an integer value
301  *
302  * @param varname	Environment variable to set
303  * @param value		Value to set it to
304  * @return 0 if ok, 1 on error
305  */
306 int env_set_ulong(const char *varname, ulong value)
307 {
308 	/* TODO: this should be unsigned */
309 	char *str = simple_itoa(value);
310 
311 	return env_set(varname, str);
312 }
313 
314 /**
315  * Set an environment variable to an value in hex
316  *
317  * @param varname	Environment variable to set
318  * @param value		Value to set it to
319  * @return 0 if ok, 1 on error
320  */
321 int env_set_hex(const char *varname, ulong value)
322 {
323 	char str[17];
324 
325 	sprintf(str, "%lx", value);
326 	return env_set(varname, str);
327 }
328 
329 ulong env_get_hex(const char *varname, ulong default_val)
330 {
331 	const char *s;
332 	ulong value;
333 	char *endp;
334 
335 	s = env_get(varname);
336 	if (s)
337 		value = simple_strtoul(s, &endp, 16);
338 	if (!s || endp == s)
339 		return default_val;
340 
341 	return value;
342 }
343 
344 #ifndef CONFIG_SPL_BUILD
345 static int do_env_set(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
346 {
347 	if (argc < 2)
348 		return CMD_RET_USAGE;
349 
350 	return _do_env_set(flag, argc, argv, H_INTERACTIVE);
351 }
352 
353 /*
354  * Prompt for environment variable
355  */
356 #if defined(CONFIG_CMD_ASKENV)
357 int do_env_ask(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
358 {
359 	char message[CONFIG_SYS_CBSIZE];
360 	int i, len, pos, size;
361 	char *local_args[4];
362 	char *endptr;
363 
364 	local_args[0] = argv[0];
365 	local_args[1] = argv[1];
366 	local_args[2] = NULL;
367 	local_args[3] = NULL;
368 
369 	/*
370 	 * Check the syntax:
371 	 *
372 	 * env_ask envname [message1 ...] [size]
373 	 */
374 	if (argc == 1)
375 		return CMD_RET_USAGE;
376 
377 	/*
378 	 * We test the last argument if it can be converted
379 	 * into a decimal number.  If yes, we assume it's
380 	 * the size.  Otherwise we echo it as part of the
381 	 * message.
382 	 */
383 	i = simple_strtoul(argv[argc - 1], &endptr, 10);
384 	if (*endptr != '\0') {			/* no size */
385 		size = CONFIG_SYS_CBSIZE - 1;
386 	} else {				/* size given */
387 		size = i;
388 		--argc;
389 	}
390 
391 	if (argc <= 2) {
392 		sprintf(message, "Please enter '%s': ", argv[1]);
393 	} else {
394 		/* env_ask envname message1 ... messagen [size] */
395 		for (i = 2, pos = 0; i < argc && pos+1 < sizeof(message); i++) {
396 			if (pos)
397 				message[pos++] = ' ';
398 
399 			strncpy(message + pos, argv[i], sizeof(message) - pos);
400 			pos += strlen(argv[i]);
401 		}
402 		if (pos < sizeof(message) - 1) {
403 			message[pos++] = ' ';
404 			message[pos] = '\0';
405 		} else
406 			message[CONFIG_SYS_CBSIZE - 1] = '\0';
407 	}
408 
409 	if (size >= CONFIG_SYS_CBSIZE)
410 		size = CONFIG_SYS_CBSIZE - 1;
411 
412 	if (size <= 0)
413 		return 1;
414 
415 	/* prompt for input */
416 	len = cli_readline(message);
417 
418 	if (size < len)
419 		console_buffer[size] = '\0';
420 
421 	len = 2;
422 	if (console_buffer[0] != '\0') {
423 		local_args[2] = console_buffer;
424 		len = 3;
425 	}
426 
427 	/* Continue calling setenv code */
428 	return _do_env_set(flag, len, local_args, H_INTERACTIVE);
429 }
430 #endif
431 
432 #if defined(CONFIG_CMD_ENV_CALLBACK)
433 static int print_static_binding(const char *var_name, const char *callback_name,
434 				void *priv)
435 {
436 	printf("\t%-20s %-20s\n", var_name, callback_name);
437 
438 	return 0;
439 }
440 
441 static int print_active_callback(ENTRY *entry)
442 {
443 	struct env_clbk_tbl *clbkp;
444 	int i;
445 	int num_callbacks;
446 
447 	if (entry->callback == NULL)
448 		return 0;
449 
450 	/* look up the callback in the linker-list */
451 	num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
452 	for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
453 	     i < num_callbacks;
454 	     i++, clbkp++) {
455 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
456 		if (entry->callback == clbkp->callback + gd->reloc_off)
457 #else
458 		if (entry->callback == clbkp->callback)
459 #endif
460 			break;
461 	}
462 
463 	if (i == num_callbacks)
464 		/* this should probably never happen, but just in case... */
465 		printf("\t%-20s %p\n", entry->key, entry->callback);
466 	else
467 		printf("\t%-20s %-20s\n", entry->key, clbkp->name);
468 
469 	return 0;
470 }
471 
472 /*
473  * Print the callbacks available and what they are bound to
474  */
475 int do_env_callback(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
476 {
477 	struct env_clbk_tbl *clbkp;
478 	int i;
479 	int num_callbacks;
480 
481 	/* Print the available callbacks */
482 	puts("Available callbacks:\n");
483 	puts("\tCallback Name\n");
484 	puts("\t-------------\n");
485 	num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
486 	for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
487 	     i < num_callbacks;
488 	     i++, clbkp++)
489 		printf("\t%s\n", clbkp->name);
490 	puts("\n");
491 
492 	/* Print the static bindings that may exist */
493 	puts("Static callback bindings:\n");
494 	printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
495 	printf("\t%-20s %-20s\n", "-------------", "-------------");
496 	env_attr_walk(ENV_CALLBACK_LIST_STATIC, print_static_binding, NULL);
497 	puts("\n");
498 
499 	/* walk through each variable and print the callback if it has one */
500 	puts("Active callback bindings:\n");
501 	printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
502 	printf("\t%-20s %-20s\n", "-------------", "-------------");
503 	hwalk_r(&env_htab, print_active_callback);
504 	return 0;
505 }
506 #endif
507 
508 #if defined(CONFIG_CMD_ENV_FLAGS)
509 static int print_static_flags(const char *var_name, const char *flags,
510 			      void *priv)
511 {
512 	enum env_flags_vartype type = env_flags_parse_vartype(flags);
513 	enum env_flags_varaccess access = env_flags_parse_varaccess(flags);
514 
515 	printf("\t%-20s %-20s %-20s\n", var_name,
516 		env_flags_get_vartype_name(type),
517 		env_flags_get_varaccess_name(access));
518 
519 	return 0;
520 }
521 
522 static int print_active_flags(ENTRY *entry)
523 {
524 	enum env_flags_vartype type;
525 	enum env_flags_varaccess access;
526 
527 	if (entry->flags == 0)
528 		return 0;
529 
530 	type = (enum env_flags_vartype)
531 		(entry->flags & ENV_FLAGS_VARTYPE_BIN_MASK);
532 	access = env_flags_parse_varaccess_from_binflags(entry->flags);
533 	printf("\t%-20s %-20s %-20s\n", entry->key,
534 		env_flags_get_vartype_name(type),
535 		env_flags_get_varaccess_name(access));
536 
537 	return 0;
538 }
539 
540 /*
541  * Print the flags available and what variables have flags
542  */
543 int do_env_flags(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
544 {
545 	/* Print the available variable types */
546 	printf("Available variable type flags (position %d):\n",
547 		ENV_FLAGS_VARTYPE_LOC);
548 	puts("\tFlag\tVariable Type Name\n");
549 	puts("\t----\t------------------\n");
550 	env_flags_print_vartypes();
551 	puts("\n");
552 
553 	/* Print the available variable access types */
554 	printf("Available variable access flags (position %d):\n",
555 		ENV_FLAGS_VARACCESS_LOC);
556 	puts("\tFlag\tVariable Access Name\n");
557 	puts("\t----\t--------------------\n");
558 	env_flags_print_varaccess();
559 	puts("\n");
560 
561 	/* Print the static flags that may exist */
562 	puts("Static flags:\n");
563 	printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
564 		"Variable Access");
565 	printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
566 		"---------------");
567 	env_attr_walk(ENV_FLAGS_LIST_STATIC, print_static_flags, NULL);
568 	puts("\n");
569 
570 	/* walk through each variable and print the flags if non-default */
571 	puts("Active flags:\n");
572 	printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
573 		"Variable Access");
574 	printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
575 		"---------------");
576 	hwalk_r(&env_htab, print_active_flags);
577 	return 0;
578 }
579 #endif
580 
581 /*
582  * Interactively edit an environment variable
583  */
584 #if defined(CONFIG_CMD_EDITENV)
585 static int do_env_edit(cmd_tbl_t *cmdtp, int flag, int argc,
586 		       char * const argv[])
587 {
588 	char buffer[CONFIG_SYS_CBSIZE];
589 	char *init_val;
590 
591 	if (argc < 2)
592 		return CMD_RET_USAGE;
593 
594 	/* before import into hashtable */
595 	if (!(gd->flags & GD_FLG_ENV_READY))
596 		return 1;
597 
598 	/* Set read buffer to initial value or empty sting */
599 	init_val = env_get(argv[1]);
600 	if (init_val)
601 		snprintf(buffer, CONFIG_SYS_CBSIZE, "%s", init_val);
602 	else
603 		buffer[0] = '\0';
604 
605 	if (cli_readline_into_buffer("edit: ", buffer, 0) < 0)
606 		return 1;
607 
608 	if (buffer[0] == '\0') {
609 		const char * const _argv[3] = { "setenv", argv[1], NULL };
610 
611 		return _do_env_set(0, 2, (char * const *)_argv, H_INTERACTIVE);
612 	} else {
613 		const char * const _argv[4] = { "setenv", argv[1], buffer,
614 			NULL };
615 
616 		return _do_env_set(0, 3, (char * const *)_argv, H_INTERACTIVE);
617 	}
618 }
619 #endif /* CONFIG_CMD_EDITENV */
620 #endif /* CONFIG_SPL_BUILD */
621 
622 /*
623  * Look up variable from environment,
624  * return address of storage for that variable,
625  * or NULL if not found
626  */
627 char *env_get(const char *name)
628 {
629 	if (gd->flags & GD_FLG_ENV_READY) { /* after import into hashtable */
630 		ENTRY e, *ep;
631 
632 		WATCHDOG_RESET();
633 
634 		e.key	= name;
635 		e.data	= NULL;
636 		hsearch_r(e, FIND, &ep, &env_htab, 0);
637 
638 		return ep ? ep->data : NULL;
639 	}
640 
641 	/* restricted capabilities before import */
642 	if (env_get_f(name, (char *)(gd->env_buf), sizeof(gd->env_buf)) > 0)
643 		return (char *)(gd->env_buf);
644 
645 	return NULL;
646 }
647 
648 /*
649  * Look up variable from environment for restricted C runtime env.
650  */
651 int env_get_f(const char *name, char *buf, unsigned len)
652 {
653 	int i, nxt;
654 
655 	for (i = 0; env_get_char(i) != '\0'; i = nxt + 1) {
656 		int val, n;
657 
658 		for (nxt = i; env_get_char(nxt) != '\0'; ++nxt) {
659 			if (nxt >= CONFIG_ENV_SIZE)
660 				return -1;
661 		}
662 
663 		val = envmatch((uchar *)name, i);
664 		if (val < 0)
665 			continue;
666 
667 		/* found; copy out */
668 		for (n = 0; n < len; ++n, ++buf) {
669 			*buf = env_get_char(val++);
670 			if (*buf == '\0')
671 				return n;
672 		}
673 
674 		if (n)
675 			*--buf = '\0';
676 
677 		printf("env_buf [%d bytes] too small for value of \"%s\"\n",
678 			len, name);
679 
680 		return n;
681 	}
682 
683 	return -1;
684 }
685 
686 /**
687  * Decode the integer value of an environment variable and return it.
688  *
689  * @param name		Name of environemnt variable
690  * @param base		Number base to use (normally 10, or 16 for hex)
691  * @param default_val	Default value to return if the variable is not
692  *			found
693  * @return the decoded value, or default_val if not found
694  */
695 ulong env_get_ulong(const char *name, int base, ulong default_val)
696 {
697 	/*
698 	 * We can use env_get() here, even before relocation, since the
699 	 * environment variable value is an integer and thus short.
700 	 */
701 	const char *str = env_get(name);
702 
703 	return str ? simple_strtoul(str, NULL, base) : default_val;
704 }
705 
706 #ifndef CONFIG_SPL_BUILD
707 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
708 static int do_env_save(cmd_tbl_t *cmdtp, int flag, int argc,
709 		       char * const argv[])
710 {
711 	struct env_driver *env = env_driver_lookup_default();
712 
713 	printf("Saving Environment to %s...\n", env->name);
714 
715 	return env_save() ? 1 : 0;
716 }
717 
718 U_BOOT_CMD(
719 	saveenv, 1, 0,	do_env_save,
720 	"save environment variables to persistent storage",
721 	""
722 );
723 #endif
724 #endif /* CONFIG_SPL_BUILD */
725 
726 
727 /*
728  * Match a name / name=value pair
729  *
730  * s1 is either a simple 'name', or a 'name=value' pair.
731  * i2 is the environment index for a 'name2=value2' pair.
732  * If the names match, return the index for the value2, else -1.
733  */
734 int envmatch(uchar *s1, int i2)
735 {
736 	if (s1 == NULL)
737 		return -1;
738 
739 	while (*s1 == env_get_char(i2++))
740 		if (*s1++ == '=')
741 			return i2;
742 
743 	if (*s1 == '\0' && env_get_char(i2-1) == '=')
744 		return i2;
745 
746 	return -1;
747 }
748 
749 #ifndef CONFIG_SPL_BUILD
750 static int do_env_default(cmd_tbl_t *cmdtp, int __flag,
751 			  int argc, char * const argv[])
752 {
753 	int all = 0, flag = 0;
754 
755 	debug("Initial value for argc=%d\n", argc);
756 	while (--argc > 0 && **++argv == '-') {
757 		char *arg = *argv;
758 
759 		while (*++arg) {
760 			switch (*arg) {
761 			case 'a':		/* default all */
762 				all = 1;
763 				break;
764 			case 'f':		/* force */
765 				flag |= H_FORCE;
766 				break;
767 			default:
768 				return cmd_usage(cmdtp);
769 			}
770 		}
771 	}
772 	debug("Final value for argc=%d\n", argc);
773 	if (all && (argc == 0)) {
774 		/* Reset the whole environment */
775 		set_default_env("## Resetting to default environment\n");
776 		return 0;
777 	}
778 	if (!all && (argc > 0)) {
779 		/* Reset individual variables */
780 		set_default_vars(argc, argv);
781 		return 0;
782 	}
783 
784 	return cmd_usage(cmdtp);
785 }
786 
787 static int do_env_delete(cmd_tbl_t *cmdtp, int flag,
788 			 int argc, char * const argv[])
789 {
790 	int env_flag = H_INTERACTIVE;
791 	int ret = 0;
792 
793 	debug("Initial value for argc=%d\n", argc);
794 	while (argc > 1 && **(argv + 1) == '-') {
795 		char *arg = *++argv;
796 
797 		--argc;
798 		while (*++arg) {
799 			switch (*arg) {
800 			case 'f':		/* force */
801 				env_flag |= H_FORCE;
802 				break;
803 			default:
804 				return CMD_RET_USAGE;
805 			}
806 		}
807 	}
808 	debug("Final value for argc=%d\n", argc);
809 
810 	env_id++;
811 
812 	while (--argc > 0) {
813 		char *name = *++argv;
814 
815 		if (!hdelete_r(name, &env_htab, env_flag))
816 			ret = 1;
817 	}
818 
819 	return ret;
820 }
821 
822 #ifdef CONFIG_CMD_EXPORTENV
823 /*
824  * env export [-t | -b | -c] [-s size] addr [var ...]
825  *	-t:	export as text format; if size is given, data will be
826  *		padded with '\0' bytes; if not, one terminating '\0'
827  *		will be added (which is included in the "filesize"
828  *		setting so you can for exmple copy this to flash and
829  *		keep the termination).
830  *	-b:	export as binary format (name=value pairs separated by
831  *		'\0', list end marked by double "\0\0")
832  *	-c:	export as checksum protected environment format as
833  *		used for example by "saveenv" command
834  *	-s size:
835  *		size of output buffer
836  *	addr:	memory address where environment gets stored
837  *	var...	List of variable names that get included into the
838  *		export. Without arguments, the whole environment gets
839  *		exported.
840  *
841  * With "-c" and size is NOT given, then the export command will
842  * format the data as currently used for the persistent storage,
843  * i. e. it will use CONFIG_ENV_SECT_SIZE as output block size and
844  * prepend a valid CRC32 checksum and, in case of redundant
845  * environment, a "current" redundancy flag. If size is given, this
846  * value will be used instead of CONFIG_ENV_SECT_SIZE; again, CRC32
847  * checksum and redundancy flag will be inserted.
848  *
849  * With "-b" and "-t", always only the real data (including a
850  * terminating '\0' byte) will be written; here the optional size
851  * argument will be used to make sure not to overflow the user
852  * provided buffer; the command will abort if the size is not
853  * sufficient. Any remaining space will be '\0' padded.
854  *
855  * On successful return, the variable "filesize" will be set.
856  * Note that filesize includes the trailing/terminating '\0' byte(s).
857  *
858  * Usage scenario:  create a text snapshot/backup of the current settings:
859  *
860  *	=> env export -t 100000
861  *	=> era ${backup_addr} +${filesize}
862  *	=> cp.b 100000 ${backup_addr} ${filesize}
863  *
864  * Re-import this snapshot, deleting all other settings:
865  *
866  *	=> env import -d -t ${backup_addr}
867  */
868 static int do_env_export(cmd_tbl_t *cmdtp, int flag,
869 			 int argc, char * const argv[])
870 {
871 	char	buf[32];
872 	ulong	addr;
873 	char	*ptr, *cmd, *res;
874 	size_t	size = 0;
875 	ssize_t	len;
876 	env_t	*envp;
877 	char	sep = '\n';
878 	int	chk = 0;
879 	int	fmt = 0;
880 
881 	cmd = *argv;
882 
883 	while (--argc > 0 && **++argv == '-') {
884 		char *arg = *argv;
885 		while (*++arg) {
886 			switch (*arg) {
887 			case 'b':		/* raw binary format */
888 				if (fmt++)
889 					goto sep_err;
890 				sep = '\0';
891 				break;
892 			case 'c':		/* external checksum format */
893 				if (fmt++)
894 					goto sep_err;
895 				sep = '\0';
896 				chk = 1;
897 				break;
898 			case 's':		/* size given */
899 				if (--argc <= 0)
900 					return cmd_usage(cmdtp);
901 				size = simple_strtoul(*++argv, NULL, 16);
902 				goto NXTARG;
903 			case 't':		/* text format */
904 				if (fmt++)
905 					goto sep_err;
906 				sep = '\n';
907 				break;
908 			default:
909 				return CMD_RET_USAGE;
910 			}
911 		}
912 NXTARG:		;
913 	}
914 
915 	if (argc < 1)
916 		return CMD_RET_USAGE;
917 
918 	addr = simple_strtoul(argv[0], NULL, 16);
919 	ptr = map_sysmem(addr, size);
920 
921 	if (size)
922 		memset(ptr, '\0', size);
923 
924 	argc--;
925 	argv++;
926 
927 	if (sep) {		/* export as text file */
928 		len = hexport_r(&env_htab, sep,
929 				H_MATCH_KEY | H_MATCH_IDENT,
930 				&ptr, size, argc, argv);
931 		if (len < 0) {
932 			pr_err("Cannot export environment: errno = %d\n", errno);
933 			return 1;
934 		}
935 		sprintf(buf, "%zX", (size_t)len);
936 		env_set("filesize", buf);
937 
938 		return 0;
939 	}
940 
941 	envp = (env_t *)ptr;
942 
943 	if (chk)		/* export as checksum protected block */
944 		res = (char *)envp->data;
945 	else			/* export as raw binary data */
946 		res = ptr;
947 
948 	len = hexport_r(&env_htab, '\0',
949 			H_MATCH_KEY | H_MATCH_IDENT,
950 			&res, ENV_SIZE, argc, argv);
951 	if (len < 0) {
952 		pr_err("Cannot export environment: errno = %d\n", errno);
953 		return 1;
954 	}
955 
956 	if (chk) {
957 		envp->crc = crc32(0, envp->data, ENV_SIZE);
958 #ifdef CONFIG_ENV_ADDR_REDUND
959 		envp->flags = ACTIVE_FLAG;
960 #endif
961 	}
962 	env_set_hex("filesize", len + offsetof(env_t, data));
963 
964 	return 0;
965 
966 sep_err:
967 	printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",	cmd);
968 	return 1;
969 }
970 #endif
971 
972 #ifdef CONFIG_CMD_IMPORTENV
973 /*
974  * env import [-d] [-t [-r] | -b | -c] addr [size]
975  *	-d:	delete existing environment before importing;
976  *		otherwise overwrite / append to existing definitions
977  *	-t:	assume text format; either "size" must be given or the
978  *		text data must be '\0' terminated
979  *	-r:	handle CRLF like LF, that means exported variables with
980  *		a content which ends with \r won't get imported. Used
981  *		to import text files created with editors which are using CRLF
982  *		for line endings. Only effective in addition to -t.
983  *	-b:	assume binary format ('\0' separated, "\0\0" terminated)
984  *	-c:	assume checksum protected environment format
985  *	addr:	memory address to read from
986  *	size:	length of input data; if missing, proper '\0'
987  *		termination is mandatory
988  */
989 static int do_env_import(cmd_tbl_t *cmdtp, int flag,
990 			 int argc, char * const argv[])
991 {
992 	ulong	addr;
993 	char	*cmd, *ptr;
994 	char	sep = '\n';
995 	int	chk = 0;
996 	int	fmt = 0;
997 	int	del = 0;
998 	int	crlf_is_lf = 0;
999 	size_t	size;
1000 
1001 	cmd = *argv;
1002 
1003 	while (--argc > 0 && **++argv == '-') {
1004 		char *arg = *argv;
1005 		while (*++arg) {
1006 			switch (*arg) {
1007 			case 'b':		/* raw binary format */
1008 				if (fmt++)
1009 					goto sep_err;
1010 				sep = '\0';
1011 				break;
1012 			case 'c':		/* external checksum format */
1013 				if (fmt++)
1014 					goto sep_err;
1015 				sep = '\0';
1016 				chk = 1;
1017 				break;
1018 			case 't':		/* text format */
1019 				if (fmt++)
1020 					goto sep_err;
1021 				sep = '\n';
1022 				break;
1023 			case 'r':		/* handle CRLF like LF */
1024 				crlf_is_lf = 1;
1025 				break;
1026 			case 'd':
1027 				del = 1;
1028 				break;
1029 			default:
1030 				return CMD_RET_USAGE;
1031 			}
1032 		}
1033 	}
1034 
1035 	if (argc < 1)
1036 		return CMD_RET_USAGE;
1037 
1038 	if (!fmt)
1039 		printf("## Warning: defaulting to text format\n");
1040 
1041 	if (sep != '\n' && crlf_is_lf )
1042 		crlf_is_lf = 0;
1043 
1044 	addr = simple_strtoul(argv[0], NULL, 16);
1045 	ptr = map_sysmem(addr, 0);
1046 
1047 	if (argc == 2) {
1048 		size = simple_strtoul(argv[1], NULL, 16);
1049 	} else if (argc == 1 && chk) {
1050 		puts("## Error: external checksum format must pass size\n");
1051 		return CMD_RET_FAILURE;
1052 	} else {
1053 		char *s = ptr;
1054 
1055 		size = 0;
1056 
1057 		while (size < MAX_ENV_SIZE) {
1058 			if ((*s == sep) && (*(s+1) == '\0'))
1059 				break;
1060 			++s;
1061 			++size;
1062 		}
1063 		if (size == MAX_ENV_SIZE) {
1064 			printf("## Warning: Input data exceeds %d bytes"
1065 				" - truncated\n", MAX_ENV_SIZE);
1066 		}
1067 		size += 2;
1068 		printf("## Info: input data size = %zu = 0x%zX\n", size, size);
1069 	}
1070 
1071 	if (chk) {
1072 		uint32_t crc;
1073 		env_t *ep = (env_t *)ptr;
1074 
1075 		size -= offsetof(env_t, data);
1076 		memcpy(&crc, &ep->crc, sizeof(crc));
1077 
1078 		if (crc32(0, ep->data, size) != crc) {
1079 			puts("## Error: bad CRC, import failed\n");
1080 			return 1;
1081 		}
1082 		ptr = (char *)ep->data;
1083 	}
1084 
1085 	if (himport_r(&env_htab, ptr, size, sep, del ? 0 : H_NOCLEAR,
1086 			crlf_is_lf, 0, NULL) == 0) {
1087 		pr_err("Environment import failed: errno = %d\n", errno);
1088 		return 1;
1089 	}
1090 	gd->flags |= GD_FLG_ENV_READY;
1091 
1092 	return 0;
1093 
1094 sep_err:
1095 	printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
1096 		cmd);
1097 	return 1;
1098 }
1099 #endif
1100 
1101 #if defined(CONFIG_CMD_ENV_EXISTS)
1102 static int do_env_exists(cmd_tbl_t *cmdtp, int flag, int argc,
1103 		       char * const argv[])
1104 {
1105 	ENTRY e, *ep;
1106 
1107 	if (argc < 2)
1108 		return CMD_RET_USAGE;
1109 
1110 	e.key = argv[1];
1111 	e.data = NULL;
1112 	hsearch_r(e, FIND, &ep, &env_htab, 0);
1113 
1114 	return (ep == NULL) ? 1 : 0;
1115 }
1116 #endif
1117 
1118 /*
1119  * New command line interface: "env" command with subcommands
1120  */
1121 static cmd_tbl_t cmd_env_sub[] = {
1122 #if defined(CONFIG_CMD_ASKENV)
1123 	U_BOOT_CMD_MKENT(ask, CONFIG_SYS_MAXARGS, 1, do_env_ask, "", ""),
1124 #endif
1125 	U_BOOT_CMD_MKENT(default, 1, 0, do_env_default, "", ""),
1126 	U_BOOT_CMD_MKENT(delete, CONFIG_SYS_MAXARGS, 0, do_env_delete, "", ""),
1127 #if defined(CONFIG_CMD_EDITENV)
1128 	U_BOOT_CMD_MKENT(edit, 2, 0, do_env_edit, "", ""),
1129 #endif
1130 #if defined(CONFIG_CMD_ENV_CALLBACK)
1131 	U_BOOT_CMD_MKENT(callbacks, 1, 0, do_env_callback, "", ""),
1132 #endif
1133 #if defined(CONFIG_CMD_ENV_FLAGS)
1134 	U_BOOT_CMD_MKENT(flags, 1, 0, do_env_flags, "", ""),
1135 #endif
1136 #if defined(CONFIG_CMD_EXPORTENV)
1137 	U_BOOT_CMD_MKENT(export, 4, 0, do_env_export, "", ""),
1138 #endif
1139 #if defined(CONFIG_CMD_GREPENV)
1140 	U_BOOT_CMD_MKENT(grep, CONFIG_SYS_MAXARGS, 1, do_env_grep, "", ""),
1141 #endif
1142 #if defined(CONFIG_CMD_IMPORTENV)
1143 	U_BOOT_CMD_MKENT(import, 5, 0, do_env_import, "", ""),
1144 #endif
1145 	U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
1146 #if defined(CONFIG_CMD_RUN)
1147 	U_BOOT_CMD_MKENT(run, CONFIG_SYS_MAXARGS, 1, do_run, "", ""),
1148 #endif
1149 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1150 	U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
1151 #endif
1152 	U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
1153 #if defined(CONFIG_CMD_ENV_EXISTS)
1154 	U_BOOT_CMD_MKENT(exists, 2, 0, do_env_exists, "", ""),
1155 #endif
1156 };
1157 
1158 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
1159 void env_reloc(void)
1160 {
1161 	fixup_cmdtable(cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1162 }
1163 #endif
1164 
1165 static int do_env(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
1166 {
1167 	cmd_tbl_t *cp;
1168 
1169 	if (argc < 2)
1170 		return CMD_RET_USAGE;
1171 
1172 	/* drop initial "env" arg */
1173 	argc--;
1174 	argv++;
1175 
1176 	cp = find_cmd_tbl(argv[0], cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1177 
1178 	if (cp)
1179 		return cp->cmd(cmdtp, flag, argc, argv);
1180 
1181 	return CMD_RET_USAGE;
1182 }
1183 
1184 #ifdef CONFIG_SYS_LONGHELP
1185 static char env_help_text[] =
1186 #if defined(CONFIG_CMD_ASKENV)
1187 	"ask name [message] [size] - ask for environment variable\nenv "
1188 #endif
1189 #if defined(CONFIG_CMD_ENV_CALLBACK)
1190 	"callbacks - print callbacks and their associated variables\nenv "
1191 #endif
1192 	"default [-f] -a - [forcibly] reset default environment\n"
1193 	"env default [-f] var [...] - [forcibly] reset variable(s) to their default values\n"
1194 	"env delete [-f] var [...] - [forcibly] delete variable(s)\n"
1195 #if defined(CONFIG_CMD_EDITENV)
1196 	"env edit name - edit environment variable\n"
1197 #endif
1198 #if defined(CONFIG_CMD_ENV_EXISTS)
1199 	"env exists name - tests for existence of variable\n"
1200 #endif
1201 #if defined(CONFIG_CMD_EXPORTENV)
1202 	"env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
1203 #endif
1204 #if defined(CONFIG_CMD_ENV_FLAGS)
1205 	"env flags - print variables that have non-default flags\n"
1206 #endif
1207 #if defined(CONFIG_CMD_GREPENV)
1208 #ifdef CONFIG_REGEX
1209 	"env grep [-e] [-n | -v | -b] string [...] - search environment\n"
1210 #else
1211 	"env grep [-n | -v | -b] string [...] - search environment\n"
1212 #endif
1213 #endif
1214 #if defined(CONFIG_CMD_IMPORTENV)
1215 	"env import [-d] [-t [-r] | -b | -c] addr [size] - import environment\n"
1216 #endif
1217 	"env print [-a | name ...] - print environment\n"
1218 #if defined(CONFIG_CMD_RUN)
1219 	"env run var [...] - run commands in an environment variable\n"
1220 #endif
1221 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1222 	"env save - save environment\n"
1223 #endif
1224 	"env set [-f] name [arg ...]\n";
1225 #endif
1226 
1227 U_BOOT_CMD(
1228 	env, CONFIG_SYS_MAXARGS, 1, do_env,
1229 	"environment handling commands", env_help_text
1230 );
1231 
1232 /*
1233  * Old command line interface, kept for compatibility
1234  */
1235 
1236 #if defined(CONFIG_CMD_EDITENV)
1237 U_BOOT_CMD_COMPLETE(
1238 	editenv, 2, 0,	do_env_edit,
1239 	"edit environment variable",
1240 	"name\n"
1241 	"    - edit environment variable 'name'",
1242 	var_complete
1243 );
1244 #endif
1245 
1246 U_BOOT_CMD_COMPLETE(
1247 	printenv, CONFIG_SYS_MAXARGS, 1,	do_env_print,
1248 	"print environment variables",
1249 	"[-a]\n    - print [all] values of all environment variables\n"
1250 	"printenv name ...\n"
1251 	"    - print value of environment variable 'name'",
1252 	var_complete
1253 );
1254 
1255 #ifdef CONFIG_CMD_GREPENV
1256 U_BOOT_CMD_COMPLETE(
1257 	grepenv, CONFIG_SYS_MAXARGS, 0,  do_env_grep,
1258 	"search environment variables",
1259 #ifdef CONFIG_REGEX
1260 	"[-e] [-n | -v | -b] string ...\n"
1261 #else
1262 	"[-n | -v | -b] string ...\n"
1263 #endif
1264 	"    - list environment name=value pairs matching 'string'\n"
1265 #ifdef CONFIG_REGEX
1266 	"      \"-e\": enable regular expressions;\n"
1267 #endif
1268 	"      \"-n\": search variable names; \"-v\": search values;\n"
1269 	"      \"-b\": search both names and values (default)",
1270 	var_complete
1271 );
1272 #endif
1273 
1274 U_BOOT_CMD_COMPLETE(
1275 	setenv, CONFIG_SYS_MAXARGS, 0,	do_env_set,
1276 	"set environment variables",
1277 	"[-f] name value ...\n"
1278 	"    - [forcibly] set environment variable 'name' to 'value ...'\n"
1279 	"setenv [-f] name\n"
1280 	"    - [forcibly] delete environment variable 'name'",
1281 	var_complete
1282 );
1283 
1284 #if defined(CONFIG_CMD_ASKENV)
1285 
1286 U_BOOT_CMD(
1287 	askenv,	CONFIG_SYS_MAXARGS,	1,	do_env_ask,
1288 	"get environment variables from stdin",
1289 	"name [message] [size]\n"
1290 	"    - get environment variable 'name' from stdin (max 'size' chars)"
1291 );
1292 #endif
1293 
1294 #if defined(CONFIG_CMD_RUN)
1295 U_BOOT_CMD_COMPLETE(
1296 	run,	CONFIG_SYS_MAXARGS,	1,	do_run,
1297 	"run commands in an environment variable",
1298 	"var [...]\n"
1299 	"    - run the commands in the environment variable(s) 'var'",
1300 	var_complete
1301 );
1302 #endif
1303 #endif /* CONFIG_SPL_BUILD */
1304