xref: /openbmc/u-boot/cmd/nvedit.c (revision ae485b54) 
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 <environment.h>
31 #include <search.h>
32 #include <errno.h>
33 #include <malloc.h>
34 #include <mapmem.h>
35 #include <watchdog.h>
36 #include <linux/stddef.h>
37 #include <asm/byteorder.h>
38 #include <asm/io.h>
39 
40 DECLARE_GLOBAL_DATA_PTR;
41 
42 #if	!defined(CONFIG_ENV_IS_IN_EEPROM)	&& \
43 	!defined(CONFIG_ENV_IS_IN_FLASH)	&& \
44 	!defined(CONFIG_ENV_IS_IN_MMC)		&& \
45 	!defined(CONFIG_ENV_IS_IN_FAT)		&& \
46 	!defined(CONFIG_ENV_IS_IN_EXT4)		&& \
47 	!defined(CONFIG_ENV_IS_IN_NAND)		&& \
48 	!defined(CONFIG_ENV_IS_IN_NVRAM)	&& \
49 	!defined(CONFIG_ENV_IS_IN_ONENAND)	&& \
50 	!defined(CONFIG_ENV_IS_IN_SATA)		&& \
51 	!defined(CONFIG_ENV_IS_IN_SPI_FLASH)	&& \
52 	!defined(CONFIG_ENV_IS_IN_REMOTE)	&& \
53 	!defined(CONFIG_ENV_IS_IN_UBI)		&& \
54 	!defined(CONFIG_ENV_IS_NOWHERE)
55 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|MMC|FAT|EXT4|\
56 NAND|NVRAM|ONENAND|SATA|SPI_FLASH|REMOTE|UBI} or CONFIG_ENV_IS_NOWHERE
57 #endif
58 
59 /*
60  * Maximum expected input data size for import command
61  */
62 #define	MAX_ENV_SIZE	(1 << 20)	/* 1 MiB */
63 
64 /*
65  * This variable is incremented on each do_env_set(), so it can
66  * be used via get_env_id() as an indication, if the environment
67  * has changed or not. So it is possible to reread an environment
68  * variable only if the environment was changed ... done so for
69  * example in NetInitLoop()
70  */
71 static int env_id = 1;
72 
73 int get_env_id(void)
74 {
75 	return env_id;
76 }
77 
78 #ifndef CONFIG_SPL_BUILD
79 /*
80  * Command interface: print one or all environment variables
81  *
82  * Returns 0 in case of error, or length of printed string
83  */
84 static int env_print(char *name, int flag)
85 {
86 	char *res = NULL;
87 	ssize_t len;
88 
89 	if (name) {		/* print a single name */
90 		ENTRY e, *ep;
91 
92 		e.key = name;
93 		e.data = NULL;
94 		hsearch_r(e, FIND, &ep, &env_htab, flag);
95 		if (ep == NULL)
96 			return 0;
97 		len = printf("%s=%s\n", ep->key, ep->data);
98 		return len;
99 	}
100 
101 	/* print whole list */
102 	len = hexport_r(&env_htab, '\n', flag, &res, 0, 0, NULL);
103 
104 	if (len > 0) {
105 		puts(res);
106 		free(res);
107 		return len;
108 	}
109 
110 	/* should never happen */
111 	printf("## Error: cannot export environment\n");
112 	return 0;
113 }
114 
115 static int do_env_print(cmd_tbl_t *cmdtp, int flag, int argc,
116 			char * const argv[])
117 {
118 	int i;
119 	int rcode = 0;
120 	int env_flag = H_HIDE_DOT;
121 
122 	if (argc > 1 && argv[1][0] == '-' && argv[1][1] == 'a') {
123 		argc--;
124 		argv++;
125 		env_flag &= ~H_HIDE_DOT;
126 	}
127 
128 	if (argc == 1) {
129 		/* print all env vars */
130 		rcode = env_print(NULL, env_flag);
131 		if (!rcode)
132 			return 1;
133 		printf("\nEnvironment size: %d/%ld bytes\n",
134 			rcode, (ulong)ENV_SIZE);
135 		return 0;
136 	}
137 
138 	/* print selected env vars */
139 	env_flag &= ~H_HIDE_DOT;
140 	for (i = 1; i < argc; ++i) {
141 		int rc = env_print(argv[i], env_flag);
142 		if (!rc) {
143 			printf("## Error: \"%s\" not defined\n", argv[i]);
144 			++rcode;
145 		}
146 	}
147 
148 	return rcode;
149 }
150 
151 #ifdef CONFIG_CMD_GREPENV
152 static int do_env_grep(cmd_tbl_t *cmdtp, int flag,
153 		       int argc, char * const argv[])
154 {
155 	char *res = NULL;
156 	int len, grep_how, grep_what;
157 
158 	if (argc < 2)
159 		return CMD_RET_USAGE;
160 
161 	grep_how  = H_MATCH_SUBSTR;	/* default: substring search	*/
162 	grep_what = H_MATCH_BOTH;	/* default: grep names and values */
163 
164 	while (--argc > 0 && **++argv == '-') {
165 		char *arg = *argv;
166 		while (*++arg) {
167 			switch (*arg) {
168 #ifdef CONFIG_REGEX
169 			case 'e':		/* use regex matching */
170 				grep_how  = H_MATCH_REGEX;
171 				break;
172 #endif
173 			case 'n':		/* grep for name */
174 				grep_what = H_MATCH_KEY;
175 				break;
176 			case 'v':		/* grep for value */
177 				grep_what = H_MATCH_DATA;
178 				break;
179 			case 'b':		/* grep for both */
180 				grep_what = H_MATCH_BOTH;
181 				break;
182 			case '-':
183 				goto DONE;
184 			default:
185 				return CMD_RET_USAGE;
186 			}
187 		}
188 	}
189 
190 DONE:
191 	len = hexport_r(&env_htab, '\n',
192 			flag | grep_what | grep_how,
193 			&res, 0, argc, argv);
194 
195 	if (len > 0) {
196 		puts(res);
197 		free(res);
198 	}
199 
200 	if (len < 2)
201 		return 1;
202 
203 	return 0;
204 }
205 #endif
206 #endif /* CONFIG_SPL_BUILD */
207 
208 /*
209  * Set a new environment variable,
210  * or replace or delete an existing one.
211  */
212 static int _do_env_set(int flag, int argc, char * const argv[], int env_flag)
213 {
214 	int   i, len;
215 	char  *name, *value, *s;
216 	ENTRY e, *ep;
217 
218 	debug("Initial value for argc=%d\n", argc);
219 	while (argc > 1 && **(argv + 1) == '-') {
220 		char *arg = *++argv;
221 
222 		--argc;
223 		while (*++arg) {
224 			switch (*arg) {
225 			case 'f':		/* force */
226 				env_flag |= H_FORCE;
227 				break;
228 			default:
229 				return CMD_RET_USAGE;
230 			}
231 		}
232 	}
233 	debug("Final value for argc=%d\n", argc);
234 	name = argv[1];
235 
236 	if (strchr(name, '=')) {
237 		printf("## Error: illegal character '='"
238 		       "in variable name \"%s\"\n", name);
239 		return 1;
240 	}
241 
242 	env_id++;
243 
244 	/* Delete only ? */
245 	if (argc < 3 || argv[2] == NULL) {
246 		int rc = hdelete_r(name, &env_htab, env_flag);
247 		return !rc;
248 	}
249 
250 	/*
251 	 * Insert / replace new value
252 	 */
253 	for (i = 2, len = 0; i < argc; ++i)
254 		len += strlen(argv[i]) + 1;
255 
256 	value = malloc(len);
257 	if (value == NULL) {
258 		printf("## Can't malloc %d bytes\n", len);
259 		return 1;
260 	}
261 	for (i = 2, s = value; i < argc; ++i) {
262 		char *v = argv[i];
263 
264 		while ((*s++ = *v++) != '\0')
265 			;
266 		*(s - 1) = ' ';
267 	}
268 	if (s != value)
269 		*--s = '\0';
270 
271 	e.key	= name;
272 	e.data	= value;
273 	hsearch_r(e, ENTER, &ep, &env_htab, env_flag);
274 	free(value);
275 	if (!ep) {
276 		printf("## Error inserting \"%s\" variable, errno=%d\n",
277 			name, errno);
278 		return 1;
279 	}
280 
281 	return 0;
282 }
283 
284 int env_set(const char *varname, const char *varvalue)
285 {
286 	const char * const argv[4] = { "setenv", varname, varvalue, NULL };
287 
288 	/* before import into hashtable */
289 	if (!(gd->flags & GD_FLG_ENV_READY))
290 		return 1;
291 
292 	if (varvalue == NULL || varvalue[0] == '\0')
293 		return _do_env_set(0, 2, (char * const *)argv, H_PROGRAMMATIC);
294 	else
295 		return _do_env_set(0, 3, (char * const *)argv, H_PROGRAMMATIC);
296 }
297 
298 /**
299  * Set an environment variable to an integer value
300  *
301  * @param varname	Environment variable to set
302  * @param value		Value to set it to
303  * @return 0 if ok, 1 on error
304  */
305 int env_set_ulong(const char *varname, ulong value)
306 {
307 	/* TODO: this should be unsigned */
308 	char *str = simple_itoa(value);
309 
310 	return env_set(varname, str);
311 }
312 
313 /**
314  * Set an environment variable to an value in hex
315  *
316  * @param varname	Environment variable to set
317  * @param value		Value to set it to
318  * @return 0 if ok, 1 on error
319  */
320 int env_set_hex(const char *varname, ulong value)
321 {
322 	char str[17];
323 
324 	sprintf(str, "%lx", value);
325 	return env_set(varname, str);
326 }
327 
328 ulong env_get_hex(const char *varname, ulong default_val)
329 {
330 	const char *s;
331 	ulong value;
332 	char *endp;
333 
334 	s = env_get(varname);
335 	if (s)
336 		value = simple_strtoul(s, &endp, 16);
337 	if (!s || endp == s)
338 		return default_val;
339 
340 	return value;
341 }
342 
343 void eth_parse_enetaddr(const char *addr, uint8_t *enetaddr)
344 {
345 	char *end;
346 	int i;
347 
348 	for (i = 0; i < 6; ++i) {
349 		enetaddr[i] = addr ? simple_strtoul(addr, &end, 16) : 0;
350 		if (addr)
351 			addr = (*end) ? end + 1 : end;
352 	}
353 }
354 
355 int eth_env_get_enetaddr(const char *name, uint8_t *enetaddr)
356 {
357 	eth_parse_enetaddr(env_get(name), enetaddr);
358 	return is_valid_ethaddr(enetaddr);
359 }
360 
361 int eth_env_set_enetaddr(const char *name, const uint8_t *enetaddr)
362 {
363 	char buf[ARP_HLEN_ASCII + 1];
364 
365 	if (eth_env_get_enetaddr(name, (uint8_t *)buf))
366 		return -EEXIST;
367 
368 	sprintf(buf, "%pM", enetaddr);
369 
370 	return env_set(name, buf);
371 }
372 
373 #ifndef CONFIG_SPL_BUILD
374 static int do_env_set(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
375 {
376 	if (argc < 2)
377 		return CMD_RET_USAGE;
378 
379 	return _do_env_set(flag, argc, argv, H_INTERACTIVE);
380 }
381 
382 /*
383  * Prompt for environment variable
384  */
385 #if defined(CONFIG_CMD_ASKENV)
386 int do_env_ask(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
387 {
388 	char message[CONFIG_SYS_CBSIZE];
389 	int i, len, pos, size;
390 	char *local_args[4];
391 	char *endptr;
392 
393 	local_args[0] = argv[0];
394 	local_args[1] = argv[1];
395 	local_args[2] = NULL;
396 	local_args[3] = NULL;
397 
398 	/*
399 	 * Check the syntax:
400 	 *
401 	 * env_ask envname [message1 ...] [size]
402 	 */
403 	if (argc == 1)
404 		return CMD_RET_USAGE;
405 
406 	/*
407 	 * We test the last argument if it can be converted
408 	 * into a decimal number.  If yes, we assume it's
409 	 * the size.  Otherwise we echo it as part of the
410 	 * message.
411 	 */
412 	i = simple_strtoul(argv[argc - 1], &endptr, 10);
413 	if (*endptr != '\0') {			/* no size */
414 		size = CONFIG_SYS_CBSIZE - 1;
415 	} else {				/* size given */
416 		size = i;
417 		--argc;
418 	}
419 
420 	if (argc <= 2) {
421 		sprintf(message, "Please enter '%s': ", argv[1]);
422 	} else {
423 		/* env_ask envname message1 ... messagen [size] */
424 		for (i = 2, pos = 0; i < argc && pos+1 < sizeof(message); i++) {
425 			if (pos)
426 				message[pos++] = ' ';
427 
428 			strncpy(message + pos, argv[i], sizeof(message) - pos);
429 			pos += strlen(argv[i]);
430 		}
431 		if (pos < sizeof(message) - 1) {
432 			message[pos++] = ' ';
433 			message[pos] = '\0';
434 		} else
435 			message[CONFIG_SYS_CBSIZE - 1] = '\0';
436 	}
437 
438 	if (size >= CONFIG_SYS_CBSIZE)
439 		size = CONFIG_SYS_CBSIZE - 1;
440 
441 	if (size <= 0)
442 		return 1;
443 
444 	/* prompt for input */
445 	len = cli_readline(message);
446 
447 	if (size < len)
448 		console_buffer[size] = '\0';
449 
450 	len = 2;
451 	if (console_buffer[0] != '\0') {
452 		local_args[2] = console_buffer;
453 		len = 3;
454 	}
455 
456 	/* Continue calling setenv code */
457 	return _do_env_set(flag, len, local_args, H_INTERACTIVE);
458 }
459 #endif
460 
461 #if defined(CONFIG_CMD_ENV_CALLBACK)
462 static int print_static_binding(const char *var_name, const char *callback_name,
463 				void *priv)
464 {
465 	printf("\t%-20s %-20s\n", var_name, callback_name);
466 
467 	return 0;
468 }
469 
470 static int print_active_callback(ENTRY *entry)
471 {
472 	struct env_clbk_tbl *clbkp;
473 	int i;
474 	int num_callbacks;
475 
476 	if (entry->callback == NULL)
477 		return 0;
478 
479 	/* look up the callback in the linker-list */
480 	num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
481 	for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
482 	     i < num_callbacks;
483 	     i++, clbkp++) {
484 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
485 		if (entry->callback == clbkp->callback + gd->reloc_off)
486 #else
487 		if (entry->callback == clbkp->callback)
488 #endif
489 			break;
490 	}
491 
492 	if (i == num_callbacks)
493 		/* this should probably never happen, but just in case... */
494 		printf("\t%-20s %p\n", entry->key, entry->callback);
495 	else
496 		printf("\t%-20s %-20s\n", entry->key, clbkp->name);
497 
498 	return 0;
499 }
500 
501 /*
502  * Print the callbacks available and what they are bound to
503  */
504 int do_env_callback(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
505 {
506 	struct env_clbk_tbl *clbkp;
507 	int i;
508 	int num_callbacks;
509 
510 	/* Print the available callbacks */
511 	puts("Available callbacks:\n");
512 	puts("\tCallback Name\n");
513 	puts("\t-------------\n");
514 	num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
515 	for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
516 	     i < num_callbacks;
517 	     i++, clbkp++)
518 		printf("\t%s\n", clbkp->name);
519 	puts("\n");
520 
521 	/* Print the static bindings that may exist */
522 	puts("Static callback bindings:\n");
523 	printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
524 	printf("\t%-20s %-20s\n", "-------------", "-------------");
525 	env_attr_walk(ENV_CALLBACK_LIST_STATIC, print_static_binding, NULL);
526 	puts("\n");
527 
528 	/* walk through each variable and print the callback if it has one */
529 	puts("Active callback bindings:\n");
530 	printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
531 	printf("\t%-20s %-20s\n", "-------------", "-------------");
532 	hwalk_r(&env_htab, print_active_callback);
533 	return 0;
534 }
535 #endif
536 
537 #if defined(CONFIG_CMD_ENV_FLAGS)
538 static int print_static_flags(const char *var_name, const char *flags,
539 			      void *priv)
540 {
541 	enum env_flags_vartype type = env_flags_parse_vartype(flags);
542 	enum env_flags_varaccess access = env_flags_parse_varaccess(flags);
543 
544 	printf("\t%-20s %-20s %-20s\n", var_name,
545 		env_flags_get_vartype_name(type),
546 		env_flags_get_varaccess_name(access));
547 
548 	return 0;
549 }
550 
551 static int print_active_flags(ENTRY *entry)
552 {
553 	enum env_flags_vartype type;
554 	enum env_flags_varaccess access;
555 
556 	if (entry->flags == 0)
557 		return 0;
558 
559 	type = (enum env_flags_vartype)
560 		(entry->flags & ENV_FLAGS_VARTYPE_BIN_MASK);
561 	access = env_flags_parse_varaccess_from_binflags(entry->flags);
562 	printf("\t%-20s %-20s %-20s\n", entry->key,
563 		env_flags_get_vartype_name(type),
564 		env_flags_get_varaccess_name(access));
565 
566 	return 0;
567 }
568 
569 /*
570  * Print the flags available and what variables have flags
571  */
572 int do_env_flags(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
573 {
574 	/* Print the available variable types */
575 	printf("Available variable type flags (position %d):\n",
576 		ENV_FLAGS_VARTYPE_LOC);
577 	puts("\tFlag\tVariable Type Name\n");
578 	puts("\t----\t------------------\n");
579 	env_flags_print_vartypes();
580 	puts("\n");
581 
582 	/* Print the available variable access types */
583 	printf("Available variable access flags (position %d):\n",
584 		ENV_FLAGS_VARACCESS_LOC);
585 	puts("\tFlag\tVariable Access Name\n");
586 	puts("\t----\t--------------------\n");
587 	env_flags_print_varaccess();
588 	puts("\n");
589 
590 	/* Print the static flags that may exist */
591 	puts("Static flags:\n");
592 	printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
593 		"Variable Access");
594 	printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
595 		"---------------");
596 	env_attr_walk(ENV_FLAGS_LIST_STATIC, print_static_flags, NULL);
597 	puts("\n");
598 
599 	/* walk through each variable and print the flags if non-default */
600 	puts("Active flags:\n");
601 	printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
602 		"Variable Access");
603 	printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
604 		"---------------");
605 	hwalk_r(&env_htab, print_active_flags);
606 	return 0;
607 }
608 #endif
609 
610 /*
611  * Interactively edit an environment variable
612  */
613 #if defined(CONFIG_CMD_EDITENV)
614 static int do_env_edit(cmd_tbl_t *cmdtp, int flag, int argc,
615 		       char * const argv[])
616 {
617 	char buffer[CONFIG_SYS_CBSIZE];
618 	char *init_val;
619 
620 	if (argc < 2)
621 		return CMD_RET_USAGE;
622 
623 	/* before import into hashtable */
624 	if (!(gd->flags & GD_FLG_ENV_READY))
625 		return 1;
626 
627 	/* Set read buffer to initial value or empty sting */
628 	init_val = env_get(argv[1]);
629 	if (init_val)
630 		snprintf(buffer, CONFIG_SYS_CBSIZE, "%s", init_val);
631 	else
632 		buffer[0] = '\0';
633 
634 	if (cli_readline_into_buffer("edit: ", buffer, 0) < 0)
635 		return 1;
636 
637 	if (buffer[0] == '\0') {
638 		const char * const _argv[3] = { "setenv", argv[1], NULL };
639 
640 		return _do_env_set(0, 2, (char * const *)_argv, H_INTERACTIVE);
641 	} else {
642 		const char * const _argv[4] = { "setenv", argv[1], buffer,
643 			NULL };
644 
645 		return _do_env_set(0, 3, (char * const *)_argv, H_INTERACTIVE);
646 	}
647 }
648 #endif /* CONFIG_CMD_EDITENV */
649 #endif /* CONFIG_SPL_BUILD */
650 
651 /*
652  * Look up variable from environment,
653  * return address of storage for that variable,
654  * or NULL if not found
655  */
656 char *env_get(const char *name)
657 {
658 	if (gd->flags & GD_FLG_ENV_READY) { /* after import into hashtable */
659 		ENTRY e, *ep;
660 
661 		WATCHDOG_RESET();
662 
663 		e.key	= name;
664 		e.data	= NULL;
665 		hsearch_r(e, FIND, &ep, &env_htab, 0);
666 
667 		return ep ? ep->data : NULL;
668 	}
669 
670 	/* restricted capabilities before import */
671 	if (env_get_f(name, (char *)(gd->env_buf), sizeof(gd->env_buf)) > 0)
672 		return (char *)(gd->env_buf);
673 
674 	return NULL;
675 }
676 
677 /*
678  * Look up variable from environment for restricted C runtime env.
679  */
680 int env_get_f(const char *name, char *buf, unsigned len)
681 {
682 	int i, nxt, c;
683 
684 	for (i = 0; env_get_char(i) != '\0'; i = nxt + 1) {
685 		int val, n;
686 
687 		for (nxt = i; (c = env_get_char(nxt)) != '\0'; ++nxt) {
688 			if (c < 0)
689 				return c;
690 			if (nxt >= CONFIG_ENV_SIZE)
691 				return -1;
692 		}
693 
694 		val = envmatch((uchar *)name, i);
695 		if (val < 0)
696 			continue;
697 
698 		/* found; copy out */
699 		for (n = 0; n < len; ++n, ++buf) {
700 			c = env_get_char(val++);
701 			if (c < 0)
702 				return c;
703 			*buf = c;
704 			if (*buf == '\0')
705 				return n;
706 		}
707 
708 		if (n)
709 			*--buf = '\0';
710 
711 		printf("env_buf [%d bytes] too small for value of \"%s\"\n",
712 			len, name);
713 
714 		return n;
715 	}
716 
717 	return -1;
718 }
719 
720 /**
721  * Decode the integer value of an environment variable and return it.
722  *
723  * @param name		Name of environment variable
724  * @param base		Number base to use (normally 10, or 16 for hex)
725  * @param default_val	Default value to return if the variable is not
726  *			found
727  * @return the decoded value, or default_val if not found
728  */
729 ulong env_get_ulong(const char *name, int base, ulong default_val)
730 {
731 	/*
732 	 * We can use env_get() here, even before relocation, since the
733 	 * environment variable value is an integer and thus short.
734 	 */
735 	const char *str = env_get(name);
736 
737 	return str ? simple_strtoul(str, NULL, base) : default_val;
738 }
739 
740 #ifndef CONFIG_SPL_BUILD
741 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
742 static int do_env_save(cmd_tbl_t *cmdtp, int flag, int argc,
743 		       char * const argv[])
744 {
745 	return env_save() ? 1 : 0;
746 }
747 
748 U_BOOT_CMD(
749 	saveenv, 1, 0,	do_env_save,
750 	"save environment variables to persistent storage",
751 	""
752 );
753 #endif
754 #endif /* CONFIG_SPL_BUILD */
755 
756 
757 /*
758  * Match a name / name=value pair
759  *
760  * s1 is either a simple 'name', or a 'name=value' pair.
761  * i2 is the environment index for a 'name2=value2' pair.
762  * If the names match, return the index for the value2, else -1.
763  */
764 int envmatch(uchar *s1, int i2)
765 {
766 	if (s1 == NULL)
767 		return -1;
768 
769 	while (*s1 == env_get_char(i2++))
770 		if (*s1++ == '=')
771 			return i2;
772 
773 	if (*s1 == '\0' && env_get_char(i2-1) == '=')
774 		return i2;
775 
776 	return -1;
777 }
778 
779 #ifndef CONFIG_SPL_BUILD
780 static int do_env_default(cmd_tbl_t *cmdtp, int __flag,
781 			  int argc, char * const argv[])
782 {
783 	int all = 0, flag = 0;
784 
785 	debug("Initial value for argc=%d\n", argc);
786 	while (--argc > 0 && **++argv == '-') {
787 		char *arg = *argv;
788 
789 		while (*++arg) {
790 			switch (*arg) {
791 			case 'a':		/* default all */
792 				all = 1;
793 				break;
794 			case 'f':		/* force */
795 				flag |= H_FORCE;
796 				break;
797 			default:
798 				return cmd_usage(cmdtp);
799 			}
800 		}
801 	}
802 	debug("Final value for argc=%d\n", argc);
803 	if (all && (argc == 0)) {
804 		/* Reset the whole environment */
805 		set_default_env("## Resetting to default environment\n");
806 		return 0;
807 	}
808 	if (!all && (argc > 0)) {
809 		/* Reset individual variables */
810 		set_default_vars(argc, argv);
811 		return 0;
812 	}
813 
814 	return cmd_usage(cmdtp);
815 }
816 
817 static int do_env_delete(cmd_tbl_t *cmdtp, int flag,
818 			 int argc, char * const argv[])
819 {
820 	int env_flag = H_INTERACTIVE;
821 	int ret = 0;
822 
823 	debug("Initial value for argc=%d\n", argc);
824 	while (argc > 1 && **(argv + 1) == '-') {
825 		char *arg = *++argv;
826 
827 		--argc;
828 		while (*++arg) {
829 			switch (*arg) {
830 			case 'f':		/* force */
831 				env_flag |= H_FORCE;
832 				break;
833 			default:
834 				return CMD_RET_USAGE;
835 			}
836 		}
837 	}
838 	debug("Final value for argc=%d\n", argc);
839 
840 	env_id++;
841 
842 	while (--argc > 0) {
843 		char *name = *++argv;
844 
845 		if (!hdelete_r(name, &env_htab, env_flag))
846 			ret = 1;
847 	}
848 
849 	return ret;
850 }
851 
852 #ifdef CONFIG_CMD_EXPORTENV
853 /*
854  * env export [-t | -b | -c] [-s size] addr [var ...]
855  *	-t:	export as text format; if size is given, data will be
856  *		padded with '\0' bytes; if not, one terminating '\0'
857  *		will be added (which is included in the "filesize"
858  *		setting so you can for exmple copy this to flash and
859  *		keep the termination).
860  *	-b:	export as binary format (name=value pairs separated by
861  *		'\0', list end marked by double "\0\0")
862  *	-c:	export as checksum protected environment format as
863  *		used for example by "saveenv" command
864  *	-s size:
865  *		size of output buffer
866  *	addr:	memory address where environment gets stored
867  *	var...	List of variable names that get included into the
868  *		export. Without arguments, the whole environment gets
869  *		exported.
870  *
871  * With "-c" and size is NOT given, then the export command will
872  * format the data as currently used for the persistent storage,
873  * i. e. it will use CONFIG_ENV_SECT_SIZE as output block size and
874  * prepend a valid CRC32 checksum and, in case of redundant
875  * environment, a "current" redundancy flag. If size is given, this
876  * value will be used instead of CONFIG_ENV_SECT_SIZE; again, CRC32
877  * checksum and redundancy flag will be inserted.
878  *
879  * With "-b" and "-t", always only the real data (including a
880  * terminating '\0' byte) will be written; here the optional size
881  * argument will be used to make sure not to overflow the user
882  * provided buffer; the command will abort if the size is not
883  * sufficient. Any remaining space will be '\0' padded.
884  *
885  * On successful return, the variable "filesize" will be set.
886  * Note that filesize includes the trailing/terminating '\0' byte(s).
887  *
888  * Usage scenario:  create a text snapshot/backup of the current settings:
889  *
890  *	=> env export -t 100000
891  *	=> era ${backup_addr} +${filesize}
892  *	=> cp.b 100000 ${backup_addr} ${filesize}
893  *
894  * Re-import this snapshot, deleting all other settings:
895  *
896  *	=> env import -d -t ${backup_addr}
897  */
898 static int do_env_export(cmd_tbl_t *cmdtp, int flag,
899 			 int argc, char * const argv[])
900 {
901 	char	buf[32];
902 	ulong	addr;
903 	char	*ptr, *cmd, *res;
904 	size_t	size = 0;
905 	ssize_t	len;
906 	env_t	*envp;
907 	char	sep = '\n';
908 	int	chk = 0;
909 	int	fmt = 0;
910 
911 	cmd = *argv;
912 
913 	while (--argc > 0 && **++argv == '-') {
914 		char *arg = *argv;
915 		while (*++arg) {
916 			switch (*arg) {
917 			case 'b':		/* raw binary format */
918 				if (fmt++)
919 					goto sep_err;
920 				sep = '\0';
921 				break;
922 			case 'c':		/* external checksum format */
923 				if (fmt++)
924 					goto sep_err;
925 				sep = '\0';
926 				chk = 1;
927 				break;
928 			case 's':		/* size given */
929 				if (--argc <= 0)
930 					return cmd_usage(cmdtp);
931 				size = simple_strtoul(*++argv, NULL, 16);
932 				goto NXTARG;
933 			case 't':		/* text format */
934 				if (fmt++)
935 					goto sep_err;
936 				sep = '\n';
937 				break;
938 			default:
939 				return CMD_RET_USAGE;
940 			}
941 		}
942 NXTARG:		;
943 	}
944 
945 	if (argc < 1)
946 		return CMD_RET_USAGE;
947 
948 	addr = simple_strtoul(argv[0], NULL, 16);
949 	ptr = map_sysmem(addr, size);
950 
951 	if (size)
952 		memset(ptr, '\0', size);
953 
954 	argc--;
955 	argv++;
956 
957 	if (sep) {		/* export as text file */
958 		len = hexport_r(&env_htab, sep,
959 				H_MATCH_KEY | H_MATCH_IDENT,
960 				&ptr, size, argc, argv);
961 		if (len < 0) {
962 			pr_err("Cannot export environment: errno = %d\n", errno);
963 			return 1;
964 		}
965 		sprintf(buf, "%zX", (size_t)len);
966 		env_set("filesize", buf);
967 
968 		return 0;
969 	}
970 
971 	envp = (env_t *)ptr;
972 
973 	if (chk)		/* export as checksum protected block */
974 		res = (char *)envp->data;
975 	else			/* export as raw binary data */
976 		res = ptr;
977 
978 	len = hexport_r(&env_htab, '\0',
979 			H_MATCH_KEY | H_MATCH_IDENT,
980 			&res, ENV_SIZE, argc, argv);
981 	if (len < 0) {
982 		pr_err("Cannot export environment: errno = %d\n", errno);
983 		return 1;
984 	}
985 
986 	if (chk) {
987 		envp->crc = crc32(0, envp->data, ENV_SIZE);
988 #ifdef CONFIG_ENV_ADDR_REDUND
989 		envp->flags = ACTIVE_FLAG;
990 #endif
991 	}
992 	env_set_hex("filesize", len + offsetof(env_t, data));
993 
994 	return 0;
995 
996 sep_err:
997 	printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",	cmd);
998 	return 1;
999 }
1000 #endif
1001 
1002 #ifdef CONFIG_CMD_IMPORTENV
1003 /*
1004  * env import [-d] [-t [-r] | -b | -c] addr [size]
1005  *	-d:	delete existing environment before importing;
1006  *		otherwise overwrite / append to existing definitions
1007  *	-t:	assume text format; either "size" must be given or the
1008  *		text data must be '\0' terminated
1009  *	-r:	handle CRLF like LF, that means exported variables with
1010  *		a content which ends with \r won't get imported. Used
1011  *		to import text files created with editors which are using CRLF
1012  *		for line endings. Only effective in addition to -t.
1013  *	-b:	assume binary format ('\0' separated, "\0\0" terminated)
1014  *	-c:	assume checksum protected environment format
1015  *	addr:	memory address to read from
1016  *	size:	length of input data; if missing, proper '\0'
1017  *		termination is mandatory
1018  */
1019 static int do_env_import(cmd_tbl_t *cmdtp, int flag,
1020 			 int argc, char * const argv[])
1021 {
1022 	ulong	addr;
1023 	char	*cmd, *ptr;
1024 	char	sep = '\n';
1025 	int	chk = 0;
1026 	int	fmt = 0;
1027 	int	del = 0;
1028 	int	crlf_is_lf = 0;
1029 	size_t	size;
1030 
1031 	cmd = *argv;
1032 
1033 	while (--argc > 0 && **++argv == '-') {
1034 		char *arg = *argv;
1035 		while (*++arg) {
1036 			switch (*arg) {
1037 			case 'b':		/* raw binary format */
1038 				if (fmt++)
1039 					goto sep_err;
1040 				sep = '\0';
1041 				break;
1042 			case 'c':		/* external checksum format */
1043 				if (fmt++)
1044 					goto sep_err;
1045 				sep = '\0';
1046 				chk = 1;
1047 				break;
1048 			case 't':		/* text format */
1049 				if (fmt++)
1050 					goto sep_err;
1051 				sep = '\n';
1052 				break;
1053 			case 'r':		/* handle CRLF like LF */
1054 				crlf_is_lf = 1;
1055 				break;
1056 			case 'd':
1057 				del = 1;
1058 				break;
1059 			default:
1060 				return CMD_RET_USAGE;
1061 			}
1062 		}
1063 	}
1064 
1065 	if (argc < 1)
1066 		return CMD_RET_USAGE;
1067 
1068 	if (!fmt)
1069 		printf("## Warning: defaulting to text format\n");
1070 
1071 	if (sep != '\n' && crlf_is_lf )
1072 		crlf_is_lf = 0;
1073 
1074 	addr = simple_strtoul(argv[0], NULL, 16);
1075 	ptr = map_sysmem(addr, 0);
1076 
1077 	if (argc == 2) {
1078 		size = simple_strtoul(argv[1], NULL, 16);
1079 	} else if (argc == 1 && chk) {
1080 		puts("## Error: external checksum format must pass size\n");
1081 		return CMD_RET_FAILURE;
1082 	} else {
1083 		char *s = ptr;
1084 
1085 		size = 0;
1086 
1087 		while (size < MAX_ENV_SIZE) {
1088 			if ((*s == sep) && (*(s+1) == '\0'))
1089 				break;
1090 			++s;
1091 			++size;
1092 		}
1093 		if (size == MAX_ENV_SIZE) {
1094 			printf("## Warning: Input data exceeds %d bytes"
1095 				" - truncated\n", MAX_ENV_SIZE);
1096 		}
1097 		size += 2;
1098 		printf("## Info: input data size = %zu = 0x%zX\n", size, size);
1099 	}
1100 
1101 	if (chk) {
1102 		uint32_t crc;
1103 		env_t *ep = (env_t *)ptr;
1104 
1105 		size -= offsetof(env_t, data);
1106 		memcpy(&crc, &ep->crc, sizeof(crc));
1107 
1108 		if (crc32(0, ep->data, size) != crc) {
1109 			puts("## Error: bad CRC, import failed\n");
1110 			return 1;
1111 		}
1112 		ptr = (char *)ep->data;
1113 	}
1114 
1115 	if (himport_r(&env_htab, ptr, size, sep, del ? 0 : H_NOCLEAR,
1116 			crlf_is_lf, 0, NULL) == 0) {
1117 		pr_err("Environment import failed: errno = %d\n", errno);
1118 		return 1;
1119 	}
1120 	gd->flags |= GD_FLG_ENV_READY;
1121 
1122 	return 0;
1123 
1124 sep_err:
1125 	printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
1126 		cmd);
1127 	return 1;
1128 }
1129 #endif
1130 
1131 #if defined(CONFIG_CMD_ENV_EXISTS)
1132 static int do_env_exists(cmd_tbl_t *cmdtp, int flag, int argc,
1133 		       char * const argv[])
1134 {
1135 	ENTRY e, *ep;
1136 
1137 	if (argc < 2)
1138 		return CMD_RET_USAGE;
1139 
1140 	e.key = argv[1];
1141 	e.data = NULL;
1142 	hsearch_r(e, FIND, &ep, &env_htab, 0);
1143 
1144 	return (ep == NULL) ? 1 : 0;
1145 }
1146 #endif
1147 
1148 /*
1149  * New command line interface: "env" command with subcommands
1150  */
1151 static cmd_tbl_t cmd_env_sub[] = {
1152 #if defined(CONFIG_CMD_ASKENV)
1153 	U_BOOT_CMD_MKENT(ask, CONFIG_SYS_MAXARGS, 1, do_env_ask, "", ""),
1154 #endif
1155 	U_BOOT_CMD_MKENT(default, 1, 0, do_env_default, "", ""),
1156 	U_BOOT_CMD_MKENT(delete, CONFIG_SYS_MAXARGS, 0, do_env_delete, "", ""),
1157 #if defined(CONFIG_CMD_EDITENV)
1158 	U_BOOT_CMD_MKENT(edit, 2, 0, do_env_edit, "", ""),
1159 #endif
1160 #if defined(CONFIG_CMD_ENV_CALLBACK)
1161 	U_BOOT_CMD_MKENT(callbacks, 1, 0, do_env_callback, "", ""),
1162 #endif
1163 #if defined(CONFIG_CMD_ENV_FLAGS)
1164 	U_BOOT_CMD_MKENT(flags, 1, 0, do_env_flags, "", ""),
1165 #endif
1166 #if defined(CONFIG_CMD_EXPORTENV)
1167 	U_BOOT_CMD_MKENT(export, 4, 0, do_env_export, "", ""),
1168 #endif
1169 #if defined(CONFIG_CMD_GREPENV)
1170 	U_BOOT_CMD_MKENT(grep, CONFIG_SYS_MAXARGS, 1, do_env_grep, "", ""),
1171 #endif
1172 #if defined(CONFIG_CMD_IMPORTENV)
1173 	U_BOOT_CMD_MKENT(import, 5, 0, do_env_import, "", ""),
1174 #endif
1175 	U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
1176 #if defined(CONFIG_CMD_RUN)
1177 	U_BOOT_CMD_MKENT(run, CONFIG_SYS_MAXARGS, 1, do_run, "", ""),
1178 #endif
1179 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1180 	U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
1181 #endif
1182 	U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
1183 #if defined(CONFIG_CMD_ENV_EXISTS)
1184 	U_BOOT_CMD_MKENT(exists, 2, 0, do_env_exists, "", ""),
1185 #endif
1186 };
1187 
1188 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
1189 void env_reloc(void)
1190 {
1191 	fixup_cmdtable(cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1192 }
1193 #endif
1194 
1195 static int do_env(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
1196 {
1197 	cmd_tbl_t *cp;
1198 
1199 	if (argc < 2)
1200 		return CMD_RET_USAGE;
1201 
1202 	/* drop initial "env" arg */
1203 	argc--;
1204 	argv++;
1205 
1206 	cp = find_cmd_tbl(argv[0], cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1207 
1208 	if (cp)
1209 		return cp->cmd(cmdtp, flag, argc, argv);
1210 
1211 	return CMD_RET_USAGE;
1212 }
1213 
1214 #ifdef CONFIG_SYS_LONGHELP
1215 static char env_help_text[] =
1216 #if defined(CONFIG_CMD_ASKENV)
1217 	"ask name [message] [size] - ask for environment variable\nenv "
1218 #endif
1219 #if defined(CONFIG_CMD_ENV_CALLBACK)
1220 	"callbacks - print callbacks and their associated variables\nenv "
1221 #endif
1222 	"default [-f] -a - [forcibly] reset default environment\n"
1223 	"env default [-f] var [...] - [forcibly] reset variable(s) to their default values\n"
1224 	"env delete [-f] var [...] - [forcibly] delete variable(s)\n"
1225 #if defined(CONFIG_CMD_EDITENV)
1226 	"env edit name - edit environment variable\n"
1227 #endif
1228 #if defined(CONFIG_CMD_ENV_EXISTS)
1229 	"env exists name - tests for existence of variable\n"
1230 #endif
1231 #if defined(CONFIG_CMD_EXPORTENV)
1232 	"env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
1233 #endif
1234 #if defined(CONFIG_CMD_ENV_FLAGS)
1235 	"env flags - print variables that have non-default flags\n"
1236 #endif
1237 #if defined(CONFIG_CMD_GREPENV)
1238 #ifdef CONFIG_REGEX
1239 	"env grep [-e] [-n | -v | -b] string [...] - search environment\n"
1240 #else
1241 	"env grep [-n | -v | -b] string [...] - search environment\n"
1242 #endif
1243 #endif
1244 #if defined(CONFIG_CMD_IMPORTENV)
1245 	"env import [-d] [-t [-r] | -b | -c] addr [size] - import environment\n"
1246 #endif
1247 	"env print [-a | name ...] - print environment\n"
1248 #if defined(CONFIG_CMD_RUN)
1249 	"env run var [...] - run commands in an environment variable\n"
1250 #endif
1251 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1252 	"env save - save environment\n"
1253 #endif
1254 	"env set [-f] name [arg ...]\n";
1255 #endif
1256 
1257 U_BOOT_CMD(
1258 	env, CONFIG_SYS_MAXARGS, 1, do_env,
1259 	"environment handling commands", env_help_text
1260 );
1261 
1262 /*
1263  * Old command line interface, kept for compatibility
1264  */
1265 
1266 #if defined(CONFIG_CMD_EDITENV)
1267 U_BOOT_CMD_COMPLETE(
1268 	editenv, 2, 0,	do_env_edit,
1269 	"edit environment variable",
1270 	"name\n"
1271 	"    - edit environment variable 'name'",
1272 	var_complete
1273 );
1274 #endif
1275 
1276 U_BOOT_CMD_COMPLETE(
1277 	printenv, CONFIG_SYS_MAXARGS, 1,	do_env_print,
1278 	"print environment variables",
1279 	"[-a]\n    - print [all] values of all environment variables\n"
1280 	"printenv name ...\n"
1281 	"    - print value of environment variable 'name'",
1282 	var_complete
1283 );
1284 
1285 #ifdef CONFIG_CMD_GREPENV
1286 U_BOOT_CMD_COMPLETE(
1287 	grepenv, CONFIG_SYS_MAXARGS, 0,  do_env_grep,
1288 	"search environment variables",
1289 #ifdef CONFIG_REGEX
1290 	"[-e] [-n | -v | -b] string ...\n"
1291 #else
1292 	"[-n | -v | -b] string ...\n"
1293 #endif
1294 	"    - list environment name=value pairs matching 'string'\n"
1295 #ifdef CONFIG_REGEX
1296 	"      \"-e\": enable regular expressions;\n"
1297 #endif
1298 	"      \"-n\": search variable names; \"-v\": search values;\n"
1299 	"      \"-b\": search both names and values (default)",
1300 	var_complete
1301 );
1302 #endif
1303 
1304 U_BOOT_CMD_COMPLETE(
1305 	setenv, CONFIG_SYS_MAXARGS, 0,	do_env_set,
1306 	"set environment variables",
1307 	"[-f] name value ...\n"
1308 	"    - [forcibly] set environment variable 'name' to 'value ...'\n"
1309 	"setenv [-f] name\n"
1310 	"    - [forcibly] delete environment variable 'name'",
1311 	var_complete
1312 );
1313 
1314 #if defined(CONFIG_CMD_ASKENV)
1315 
1316 U_BOOT_CMD(
1317 	askenv,	CONFIG_SYS_MAXARGS,	1,	do_env_ask,
1318 	"get environment variables from stdin",
1319 	"name [message] [size]\n"
1320 	"    - get environment variable 'name' from stdin (max 'size' chars)"
1321 );
1322 #endif
1323 
1324 #if defined(CONFIG_CMD_RUN)
1325 U_BOOT_CMD_COMPLETE(
1326 	run,	CONFIG_SYS_MAXARGS,	1,	do_run,
1327 	"run commands in an environment variable",
1328 	"var [...]\n"
1329 	"    - run the commands in the environment variable(s) 'var'",
1330 	var_complete
1331 );
1332 #endif
1333 #endif /* CONFIG_SPL_BUILD */
1334