xref: /openbmc/u-boot/cmd/nvedit.c (revision bf7ab1e7) 
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_DATAFLASH)	&& \
46 	!defined(CONFIG_ENV_IS_IN_MMC)		&& \
47 	!defined(CONFIG_ENV_IS_IN_FAT)		&& \
48 	!defined(CONFIG_ENV_IS_IN_EXT4)		&& \
49 	!defined(CONFIG_ENV_IS_IN_NAND)		&& \
50 	!defined(CONFIG_ENV_IS_IN_NVRAM)	&& \
51 	!defined(CONFIG_ENV_IS_IN_ONENAND)	&& \
52 	!defined(CONFIG_ENV_IS_IN_SATA)		&& \
53 	!defined(CONFIG_ENV_IS_IN_SPI_FLASH)	&& \
54 	!defined(CONFIG_ENV_IS_IN_REMOTE)	&& \
55 	!defined(CONFIG_ENV_IS_IN_UBI)		&& \
56 	!defined(CONFIG_ENV_IS_NOWHERE)
57 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|DATAFLASH|ONENAND|\
58 SATA|SPI_FLASH|NVRAM|MMC|FAT|EXT4|REMOTE|UBI} or CONFIG_ENV_IS_NOWHERE
59 #endif
60 
61 /*
62  * Maximum expected input data size for import command
63  */
64 #define	MAX_ENV_SIZE	(1 << 20)	/* 1 MiB */
65 
66 /*
67  * This variable is incremented on each do_env_set(), so it can
68  * be used via get_env_id() as an indication, if the environment
69  * has changed or not. So it is possible to reread an environment
70  * variable only if the environment was changed ... done so for
71  * example in NetInitLoop()
72  */
73 static int env_id = 1;
74 
75 int get_env_id(void)
76 {
77 	return env_id;
78 }
79 
80 #ifndef CONFIG_SPL_BUILD
81 /*
82  * Command interface: print one or all environment variables
83  *
84  * Returns 0 in case of error, or length of printed string
85  */
86 static int env_print(char *name, int flag)
87 {
88 	char *res = NULL;
89 	ssize_t len;
90 
91 	if (name) {		/* print a single name */
92 		ENTRY e, *ep;
93 
94 		e.key = name;
95 		e.data = NULL;
96 		hsearch_r(e, FIND, &ep, &env_htab, flag);
97 		if (ep == NULL)
98 			return 0;
99 		len = printf("%s=%s\n", ep->key, ep->data);
100 		return len;
101 	}
102 
103 	/* print whole list */
104 	len = hexport_r(&env_htab, '\n', flag, &res, 0, 0, NULL);
105 
106 	if (len > 0) {
107 		puts(res);
108 		free(res);
109 		return len;
110 	}
111 
112 	/* should never happen */
113 	printf("## Error: cannot export environment\n");
114 	return 0;
115 }
116 
117 static int do_env_print(cmd_tbl_t *cmdtp, int flag, int argc,
118 			char * const argv[])
119 {
120 	int i;
121 	int rcode = 0;
122 	int env_flag = H_HIDE_DOT;
123 
124 	if (argc > 1 && argv[1][0] == '-' && argv[1][1] == 'a') {
125 		argc--;
126 		argv++;
127 		env_flag &= ~H_HIDE_DOT;
128 	}
129 
130 	if (argc == 1) {
131 		/* print all env vars */
132 		rcode = env_print(NULL, env_flag);
133 		if (!rcode)
134 			return 1;
135 		printf("\nEnvironment size: %d/%ld bytes\n",
136 			rcode, (ulong)ENV_SIZE);
137 		return 0;
138 	}
139 
140 	/* print selected env vars */
141 	env_flag &= ~H_HIDE_DOT;
142 	for (i = 1; i < argc; ++i) {
143 		int rc = env_print(argv[i], env_flag);
144 		if (!rc) {
145 			printf("## Error: \"%s\" not defined\n", argv[i]);
146 			++rcode;
147 		}
148 	}
149 
150 	return rcode;
151 }
152 
153 #ifdef CONFIG_CMD_GREPENV
154 static int do_env_grep(cmd_tbl_t *cmdtp, int flag,
155 		       int argc, char * const argv[])
156 {
157 	char *res = NULL;
158 	int len, grep_how, grep_what;
159 
160 	if (argc < 2)
161 		return CMD_RET_USAGE;
162 
163 	grep_how  = H_MATCH_SUBSTR;	/* default: substring search	*/
164 	grep_what = H_MATCH_BOTH;	/* default: grep names and values */
165 
166 	while (--argc > 0 && **++argv == '-') {
167 		char *arg = *argv;
168 		while (*++arg) {
169 			switch (*arg) {
170 #ifdef CONFIG_REGEX
171 			case 'e':		/* use regex matching */
172 				grep_how  = H_MATCH_REGEX;
173 				break;
174 #endif
175 			case 'n':		/* grep for name */
176 				grep_what = H_MATCH_KEY;
177 				break;
178 			case 'v':		/* grep for value */
179 				grep_what = H_MATCH_DATA;
180 				break;
181 			case 'b':		/* grep for both */
182 				grep_what = H_MATCH_BOTH;
183 				break;
184 			case '-':
185 				goto DONE;
186 			default:
187 				return CMD_RET_USAGE;
188 			}
189 		}
190 	}
191 
192 DONE:
193 	len = hexport_r(&env_htab, '\n',
194 			flag | grep_what | grep_how,
195 			&res, 0, argc, argv);
196 
197 	if (len > 0) {
198 		puts(res);
199 		free(res);
200 	}
201 
202 	if (len < 2)
203 		return 1;
204 
205 	return 0;
206 }
207 #endif
208 #endif /* CONFIG_SPL_BUILD */
209 
210 /*
211  * Set a new environment variable,
212  * or replace or delete an existing one.
213  */
214 static int _do_env_set(int flag, int argc, char * const argv[], int env_flag)
215 {
216 	int   i, len;
217 	char  *name, *value, *s;
218 	ENTRY e, *ep;
219 
220 	debug("Initial value for argc=%d\n", argc);
221 	while (argc > 1 && **(argv + 1) == '-') {
222 		char *arg = *++argv;
223 
224 		--argc;
225 		while (*++arg) {
226 			switch (*arg) {
227 			case 'f':		/* force */
228 				env_flag |= H_FORCE;
229 				break;
230 			default:
231 				return CMD_RET_USAGE;
232 			}
233 		}
234 	}
235 	debug("Final value for argc=%d\n", argc);
236 	name = argv[1];
237 	value = argv[2];
238 
239 	if (strchr(name, '=')) {
240 		printf("## Error: illegal character '='"
241 		       "in variable name \"%s\"\n", name);
242 		return 1;
243 	}
244 
245 	env_id++;
246 
247 	/* Delete only ? */
248 	if (argc < 3 || argv[2] == NULL) {
249 		int rc = hdelete_r(name, &env_htab, env_flag);
250 		return !rc;
251 	}
252 
253 	/*
254 	 * Insert / replace new value
255 	 */
256 	for (i = 2, len = 0; i < argc; ++i)
257 		len += strlen(argv[i]) + 1;
258 
259 	value = malloc(len);
260 	if (value == NULL) {
261 		printf("## Can't malloc %d bytes\n", len);
262 		return 1;
263 	}
264 	for (i = 2, s = value; i < argc; ++i) {
265 		char *v = argv[i];
266 
267 		while ((*s++ = *v++) != '\0')
268 			;
269 		*(s - 1) = ' ';
270 	}
271 	if (s != value)
272 		*--s = '\0';
273 
274 	e.key	= name;
275 	e.data	= value;
276 	hsearch_r(e, ENTER, &ep, &env_htab, env_flag);
277 	free(value);
278 	if (!ep) {
279 		printf("## Error inserting \"%s\" variable, errno=%d\n",
280 			name, errno);
281 		return 1;
282 	}
283 
284 	return 0;
285 }
286 
287 int setenv(const char *varname, const char *varvalue)
288 {
289 	const char * const argv[4] = { "setenv", varname, varvalue, NULL };
290 
291 	/* before import into hashtable */
292 	if (!(gd->flags & GD_FLG_ENV_READY))
293 		return 1;
294 
295 	if (varvalue == NULL || varvalue[0] == '\0')
296 		return _do_env_set(0, 2, (char * const *)argv, H_PROGRAMMATIC);
297 	else
298 		return _do_env_set(0, 3, (char * const *)argv, H_PROGRAMMATIC);
299 }
300 
301 /**
302  * Set an environment variable to an integer value
303  *
304  * @param varname	Environment variable to set
305  * @param value		Value to set it to
306  * @return 0 if ok, 1 on error
307  */
308 int setenv_ulong(const char *varname, ulong value)
309 {
310 	/* TODO: this should be unsigned */
311 	char *str = simple_itoa(value);
312 
313 	return setenv(varname, str);
314 }
315 
316 /**
317  * Set an environment variable to an value in hex
318  *
319  * @param varname	Environment variable to set
320  * @param value		Value to set it to
321  * @return 0 if ok, 1 on error
322  */
323 int setenv_hex(const char *varname, ulong value)
324 {
325 	char str[17];
326 
327 	sprintf(str, "%lx", value);
328 	return setenv(varname, str);
329 }
330 
331 ulong getenv_hex(const char *varname, ulong default_val)
332 {
333 	const char *s;
334 	ulong value;
335 	char *endp;
336 
337 	s = getenv(varname);
338 	if (s)
339 		value = simple_strtoul(s, &endp, 16);
340 	if (!s || endp == s)
341 		return default_val;
342 
343 	return value;
344 }
345 
346 #ifndef CONFIG_SPL_BUILD
347 static int do_env_set(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
348 {
349 	if (argc < 2)
350 		return CMD_RET_USAGE;
351 
352 	return _do_env_set(flag, argc, argv, H_INTERACTIVE);
353 }
354 
355 /*
356  * Prompt for environment variable
357  */
358 #if defined(CONFIG_CMD_ASKENV)
359 int do_env_ask(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
360 {
361 	char message[CONFIG_SYS_CBSIZE];
362 	int i, len, pos, size;
363 	char *local_args[4];
364 	char *endptr;
365 
366 	local_args[0] = argv[0];
367 	local_args[1] = argv[1];
368 	local_args[2] = NULL;
369 	local_args[3] = NULL;
370 
371 	/*
372 	 * Check the syntax:
373 	 *
374 	 * env_ask envname [message1 ...] [size]
375 	 */
376 	if (argc == 1)
377 		return CMD_RET_USAGE;
378 
379 	/*
380 	 * We test the last argument if it can be converted
381 	 * into a decimal number.  If yes, we assume it's
382 	 * the size.  Otherwise we echo it as part of the
383 	 * message.
384 	 */
385 	i = simple_strtoul(argv[argc - 1], &endptr, 10);
386 	if (*endptr != '\0') {			/* no size */
387 		size = CONFIG_SYS_CBSIZE - 1;
388 	} else {				/* size given */
389 		size = i;
390 		--argc;
391 	}
392 
393 	if (argc <= 2) {
394 		sprintf(message, "Please enter '%s': ", argv[1]);
395 	} else {
396 		/* env_ask envname message1 ... messagen [size] */
397 		for (i = 2, pos = 0; i < argc; i++) {
398 			if (pos)
399 				message[pos++] = ' ';
400 
401 			strcpy(message + pos, argv[i]);
402 			pos += strlen(argv[i]);
403 		}
404 		message[pos++] = ' ';
405 		message[pos] = '\0';
406 	}
407 
408 	if (size >= CONFIG_SYS_CBSIZE)
409 		size = CONFIG_SYS_CBSIZE - 1;
410 
411 	if (size <= 0)
412 		return 1;
413 
414 	/* prompt for input */
415 	len = cli_readline(message);
416 
417 	if (size < len)
418 		console_buffer[size] = '\0';
419 
420 	len = 2;
421 	if (console_buffer[0] != '\0') {
422 		local_args[2] = console_buffer;
423 		len = 3;
424 	}
425 
426 	/* Continue calling setenv code */
427 	return _do_env_set(flag, len, local_args, H_INTERACTIVE);
428 }
429 #endif
430 
431 #if defined(CONFIG_CMD_ENV_CALLBACK)
432 static int print_static_binding(const char *var_name, const char *callback_name,
433 				void *priv)
434 {
435 	printf("\t%-20s %-20s\n", var_name, callback_name);
436 
437 	return 0;
438 }
439 
440 static int print_active_callback(ENTRY *entry)
441 {
442 	struct env_clbk_tbl *clbkp;
443 	int i;
444 	int num_callbacks;
445 
446 	if (entry->callback == NULL)
447 		return 0;
448 
449 	/* look up the callback in the linker-list */
450 	num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
451 	for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
452 	     i < num_callbacks;
453 	     i++, clbkp++) {
454 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
455 		if (entry->callback == clbkp->callback + gd->reloc_off)
456 #else
457 		if (entry->callback == clbkp->callback)
458 #endif
459 			break;
460 	}
461 
462 	if (i == num_callbacks)
463 		/* this should probably never happen, but just in case... */
464 		printf("\t%-20s %p\n", entry->key, entry->callback);
465 	else
466 		printf("\t%-20s %-20s\n", entry->key, clbkp->name);
467 
468 	return 0;
469 }
470 
471 /*
472  * Print the callbacks available and what they are bound to
473  */
474 int do_env_callback(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
475 {
476 	struct env_clbk_tbl *clbkp;
477 	int i;
478 	int num_callbacks;
479 
480 	/* Print the available callbacks */
481 	puts("Available callbacks:\n");
482 	puts("\tCallback Name\n");
483 	puts("\t-------------\n");
484 	num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
485 	for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
486 	     i < num_callbacks;
487 	     i++, clbkp++)
488 		printf("\t%s\n", clbkp->name);
489 	puts("\n");
490 
491 	/* Print the static bindings that may exist */
492 	puts("Static callback bindings:\n");
493 	printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
494 	printf("\t%-20s %-20s\n", "-------------", "-------------");
495 	env_attr_walk(ENV_CALLBACK_LIST_STATIC, print_static_binding, NULL);
496 	puts("\n");
497 
498 	/* walk through each variable and print the callback if it has one */
499 	puts("Active callback bindings:\n");
500 	printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
501 	printf("\t%-20s %-20s\n", "-------------", "-------------");
502 	hwalk_r(&env_htab, print_active_callback);
503 	return 0;
504 }
505 #endif
506 
507 #if defined(CONFIG_CMD_ENV_FLAGS)
508 static int print_static_flags(const char *var_name, const char *flags,
509 			      void *priv)
510 {
511 	enum env_flags_vartype type = env_flags_parse_vartype(flags);
512 	enum env_flags_varaccess access = env_flags_parse_varaccess(flags);
513 
514 	printf("\t%-20s %-20s %-20s\n", var_name,
515 		env_flags_get_vartype_name(type),
516 		env_flags_get_varaccess_name(access));
517 
518 	return 0;
519 }
520 
521 static int print_active_flags(ENTRY *entry)
522 {
523 	enum env_flags_vartype type;
524 	enum env_flags_varaccess access;
525 
526 	if (entry->flags == 0)
527 		return 0;
528 
529 	type = (enum env_flags_vartype)
530 		(entry->flags & ENV_FLAGS_VARTYPE_BIN_MASK);
531 	access = env_flags_parse_varaccess_from_binflags(entry->flags);
532 	printf("\t%-20s %-20s %-20s\n", entry->key,
533 		env_flags_get_vartype_name(type),
534 		env_flags_get_varaccess_name(access));
535 
536 	return 0;
537 }
538 
539 /*
540  * Print the flags available and what variables have flags
541  */
542 int do_env_flags(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
543 {
544 	/* Print the available variable types */
545 	printf("Available variable type flags (position %d):\n",
546 		ENV_FLAGS_VARTYPE_LOC);
547 	puts("\tFlag\tVariable Type Name\n");
548 	puts("\t----\t------------------\n");
549 	env_flags_print_vartypes();
550 	puts("\n");
551 
552 	/* Print the available variable access types */
553 	printf("Available variable access flags (position %d):\n",
554 		ENV_FLAGS_VARACCESS_LOC);
555 	puts("\tFlag\tVariable Access Name\n");
556 	puts("\t----\t--------------------\n");
557 	env_flags_print_varaccess();
558 	puts("\n");
559 
560 	/* Print the static flags that may exist */
561 	puts("Static flags:\n");
562 	printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
563 		"Variable Access");
564 	printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
565 		"---------------");
566 	env_attr_walk(ENV_FLAGS_LIST_STATIC, print_static_flags, NULL);
567 	puts("\n");
568 
569 	/* walk through each variable and print the flags if non-default */
570 	puts("Active flags:\n");
571 	printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
572 		"Variable Access");
573 	printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
574 		"---------------");
575 	hwalk_r(&env_htab, print_active_flags);
576 	return 0;
577 }
578 #endif
579 
580 /*
581  * Interactively edit an environment variable
582  */
583 #if defined(CONFIG_CMD_EDITENV)
584 static int do_env_edit(cmd_tbl_t *cmdtp, int flag, int argc,
585 		       char * const argv[])
586 {
587 	char buffer[CONFIG_SYS_CBSIZE];
588 	char *init_val;
589 
590 	if (argc < 2)
591 		return CMD_RET_USAGE;
592 
593 	/* before import into hashtable */
594 	if (!(gd->flags & GD_FLG_ENV_READY))
595 		return 1;
596 
597 	/* Set read buffer to initial value or empty sting */
598 	init_val = getenv(argv[1]);
599 	if (init_val)
600 		snprintf(buffer, CONFIG_SYS_CBSIZE, "%s", init_val);
601 	else
602 		buffer[0] = '\0';
603 
604 	if (cli_readline_into_buffer("edit: ", buffer, 0) < 0)
605 		return 1;
606 
607 	if (buffer[0] == '\0') {
608 		const char * const _argv[3] = { "setenv", argv[1], NULL };
609 
610 		return _do_env_set(0, 2, (char * const *)_argv, H_INTERACTIVE);
611 	} else {
612 		const char * const _argv[4] = { "setenv", argv[1], buffer,
613 			NULL };
614 
615 		return _do_env_set(0, 3, (char * const *)_argv, H_INTERACTIVE);
616 	}
617 }
618 #endif /* CONFIG_CMD_EDITENV */
619 #endif /* CONFIG_SPL_BUILD */
620 
621 /*
622  * Look up variable from environment,
623  * return address of storage for that variable,
624  * or NULL if not found
625  */
626 char *getenv(const char *name)
627 {
628 	if (gd->flags & GD_FLG_ENV_READY) { /* after import into hashtable */
629 		ENTRY e, *ep;
630 
631 		WATCHDOG_RESET();
632 
633 		e.key	= name;
634 		e.data	= NULL;
635 		hsearch_r(e, FIND, &ep, &env_htab, 0);
636 
637 		return ep ? ep->data : NULL;
638 	}
639 
640 	/* restricted capabilities before import */
641 	if (getenv_f(name, (char *)(gd->env_buf), sizeof(gd->env_buf)) > 0)
642 		return (char *)(gd->env_buf);
643 
644 	return NULL;
645 }
646 
647 /*
648  * Look up variable from environment for restricted C runtime env.
649  */
650 int getenv_f(const char *name, char *buf, unsigned len)
651 {
652 	int i, nxt;
653 
654 	for (i = 0; env_get_char(i) != '\0'; i = nxt + 1) {
655 		int val, n;
656 
657 		for (nxt = i; env_get_char(nxt) != '\0'; ++nxt) {
658 			if (nxt >= CONFIG_ENV_SIZE)
659 				return -1;
660 		}
661 
662 		val = envmatch((uchar *)name, i);
663 		if (val < 0)
664 			continue;
665 
666 		/* found; copy out */
667 		for (n = 0; n < len; ++n, ++buf) {
668 			*buf = env_get_char(val++);
669 			if (*buf == '\0')
670 				return n;
671 		}
672 
673 		if (n)
674 			*--buf = '\0';
675 
676 		printf("env_buf [%d bytes] too small for value of \"%s\"\n",
677 			len, name);
678 
679 		return n;
680 	}
681 
682 	return -1;
683 }
684 
685 /**
686  * Decode the integer value of an environment variable and return it.
687  *
688  * @param name		Name of environemnt variable
689  * @param base		Number base to use (normally 10, or 16 for hex)
690  * @param default_val	Default value to return if the variable is not
691  *			found
692  * @return the decoded value, or default_val if not found
693  */
694 ulong getenv_ulong(const char *name, int base, ulong default_val)
695 {
696 	/*
697 	 * We can use getenv() here, even before relocation, since the
698 	 * environment variable value is an integer and thus short.
699 	 */
700 	const char *str = getenv(name);
701 
702 	return str ? simple_strtoul(str, NULL, base) : default_val;
703 }
704 
705 #ifndef CONFIG_SPL_BUILD
706 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
707 static int do_env_save(cmd_tbl_t *cmdtp, int flag, int argc,
708 		       char * const argv[])
709 {
710 	printf("Saving Environment to %s...\n", env_name_spec);
711 
712 	return saveenv() ? 1 : 0;
713 }
714 
715 U_BOOT_CMD(
716 	saveenv, 1, 0,	do_env_save,
717 	"save environment variables to persistent storage",
718 	""
719 );
720 #endif
721 #endif /* CONFIG_SPL_BUILD */
722 
723 
724 /*
725  * Match a name / name=value pair
726  *
727  * s1 is either a simple 'name', or a 'name=value' pair.
728  * i2 is the environment index for a 'name2=value2' pair.
729  * If the names match, return the index for the value2, else -1.
730  */
731 int envmatch(uchar *s1, int i2)
732 {
733 	if (s1 == NULL)
734 		return -1;
735 
736 	while (*s1 == env_get_char(i2++))
737 		if (*s1++ == '=')
738 			return i2;
739 
740 	if (*s1 == '\0' && env_get_char(i2-1) == '=')
741 		return i2;
742 
743 	return -1;
744 }
745 
746 #ifndef CONFIG_SPL_BUILD
747 static int do_env_default(cmd_tbl_t *cmdtp, int __flag,
748 			  int argc, char * const argv[])
749 {
750 	int all = 0, flag = 0;
751 
752 	debug("Initial value for argc=%d\n", argc);
753 	while (--argc > 0 && **++argv == '-') {
754 		char *arg = *argv;
755 
756 		while (*++arg) {
757 			switch (*arg) {
758 			case 'a':		/* default all */
759 				all = 1;
760 				break;
761 			case 'f':		/* force */
762 				flag |= H_FORCE;
763 				break;
764 			default:
765 				return cmd_usage(cmdtp);
766 			}
767 		}
768 	}
769 	debug("Final value for argc=%d\n", argc);
770 	if (all && (argc == 0)) {
771 		/* Reset the whole environment */
772 		set_default_env("## Resetting to default environment\n");
773 		return 0;
774 	}
775 	if (!all && (argc > 0)) {
776 		/* Reset individual variables */
777 		set_default_vars(argc, argv);
778 		return 0;
779 	}
780 
781 	return cmd_usage(cmdtp);
782 }
783 
784 static int do_env_delete(cmd_tbl_t *cmdtp, int flag,
785 			 int argc, char * const argv[])
786 {
787 	int env_flag = H_INTERACTIVE;
788 	int ret = 0;
789 
790 	debug("Initial value for argc=%d\n", argc);
791 	while (argc > 1 && **(argv + 1) == '-') {
792 		char *arg = *++argv;
793 
794 		--argc;
795 		while (*++arg) {
796 			switch (*arg) {
797 			case 'f':		/* force */
798 				env_flag |= H_FORCE;
799 				break;
800 			default:
801 				return CMD_RET_USAGE;
802 			}
803 		}
804 	}
805 	debug("Final value for argc=%d\n", argc);
806 
807 	env_id++;
808 
809 	while (--argc > 0) {
810 		char *name = *++argv;
811 
812 		if (!hdelete_r(name, &env_htab, env_flag))
813 			ret = 1;
814 	}
815 
816 	return ret;
817 }
818 
819 #ifdef CONFIG_CMD_EXPORTENV
820 /*
821  * env export [-t | -b | -c] [-s size] addr [var ...]
822  *	-t:	export as text format; if size is given, data will be
823  *		padded with '\0' bytes; if not, one terminating '\0'
824  *		will be added (which is included in the "filesize"
825  *		setting so you can for exmple copy this to flash and
826  *		keep the termination).
827  *	-b:	export as binary format (name=value pairs separated by
828  *		'\0', list end marked by double "\0\0")
829  *	-c:	export as checksum protected environment format as
830  *		used for example by "saveenv" command
831  *	-s size:
832  *		size of output buffer
833  *	addr:	memory address where environment gets stored
834  *	var...	List of variable names that get included into the
835  *		export. Without arguments, the whole environment gets
836  *		exported.
837  *
838  * With "-c" and size is NOT given, then the export command will
839  * format the data as currently used for the persistent storage,
840  * i. e. it will use CONFIG_ENV_SECT_SIZE as output block size and
841  * prepend a valid CRC32 checksum and, in case of redundant
842  * environment, a "current" redundancy flag. If size is given, this
843  * value will be used instead of CONFIG_ENV_SECT_SIZE; again, CRC32
844  * checksum and redundancy flag will be inserted.
845  *
846  * With "-b" and "-t", always only the real data (including a
847  * terminating '\0' byte) will be written; here the optional size
848  * argument will be used to make sure not to overflow the user
849  * provided buffer; the command will abort if the size is not
850  * sufficient. Any remaining space will be '\0' padded.
851  *
852  * On successful return, the variable "filesize" will be set.
853  * Note that filesize includes the trailing/terminating '\0' byte(s).
854  *
855  * Usage scenario:  create a text snapshot/backup of the current settings:
856  *
857  *	=> env export -t 100000
858  *	=> era ${backup_addr} +${filesize}
859  *	=> cp.b 100000 ${backup_addr} ${filesize}
860  *
861  * Re-import this snapshot, deleting all other settings:
862  *
863  *	=> env import -d -t ${backup_addr}
864  */
865 static int do_env_export(cmd_tbl_t *cmdtp, int flag,
866 			 int argc, char * const argv[])
867 {
868 	char	buf[32];
869 	ulong	addr;
870 	char	*ptr, *cmd, *res;
871 	size_t	size = 0;
872 	ssize_t	len;
873 	env_t	*envp;
874 	char	sep = '\n';
875 	int	chk = 0;
876 	int	fmt = 0;
877 
878 	cmd = *argv;
879 
880 	while (--argc > 0 && **++argv == '-') {
881 		char *arg = *argv;
882 		while (*++arg) {
883 			switch (*arg) {
884 			case 'b':		/* raw binary format */
885 				if (fmt++)
886 					goto sep_err;
887 				sep = '\0';
888 				break;
889 			case 'c':		/* external checksum format */
890 				if (fmt++)
891 					goto sep_err;
892 				sep = '\0';
893 				chk = 1;
894 				break;
895 			case 's':		/* size given */
896 				if (--argc <= 0)
897 					return cmd_usage(cmdtp);
898 				size = simple_strtoul(*++argv, NULL, 16);
899 				goto NXTARG;
900 			case 't':		/* text format */
901 				if (fmt++)
902 					goto sep_err;
903 				sep = '\n';
904 				break;
905 			default:
906 				return CMD_RET_USAGE;
907 			}
908 		}
909 NXTARG:		;
910 	}
911 
912 	if (argc < 1)
913 		return CMD_RET_USAGE;
914 
915 	addr = simple_strtoul(argv[0], NULL, 16);
916 	ptr = map_sysmem(addr, size);
917 
918 	if (size)
919 		memset(ptr, '\0', size);
920 
921 	argc--;
922 	argv++;
923 
924 	if (sep) {		/* export as text file */
925 		len = hexport_r(&env_htab, sep,
926 				H_MATCH_KEY | H_MATCH_IDENT,
927 				&ptr, size, argc, argv);
928 		if (len < 0) {
929 			error("Cannot export environment: errno = %d\n", errno);
930 			return 1;
931 		}
932 		sprintf(buf, "%zX", (size_t)len);
933 		setenv("filesize", buf);
934 
935 		return 0;
936 	}
937 
938 	envp = (env_t *)ptr;
939 
940 	if (chk)		/* export as checksum protected block */
941 		res = (char *)envp->data;
942 	else			/* export as raw binary data */
943 		res = ptr;
944 
945 	len = hexport_r(&env_htab, '\0',
946 			H_MATCH_KEY | H_MATCH_IDENT,
947 			&res, ENV_SIZE, argc, argv);
948 	if (len < 0) {
949 		error("Cannot export environment: errno = %d\n", errno);
950 		return 1;
951 	}
952 
953 	if (chk) {
954 		envp->crc = crc32(0, envp->data, ENV_SIZE);
955 #ifdef CONFIG_ENV_ADDR_REDUND
956 		envp->flags = ACTIVE_FLAG;
957 #endif
958 	}
959 	setenv_hex("filesize", len + offsetof(env_t, data));
960 
961 	return 0;
962 
963 sep_err:
964 	printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",	cmd);
965 	return 1;
966 }
967 #endif
968 
969 #ifdef CONFIG_CMD_IMPORTENV
970 /*
971  * env import [-d] [-t [-r] | -b | -c] addr [size]
972  *	-d:	delete existing environment before importing;
973  *		otherwise overwrite / append to existing definitions
974  *	-t:	assume text format; either "size" must be given or the
975  *		text data must be '\0' terminated
976  *	-r:	handle CRLF like LF, that means exported variables with
977  *		a content which ends with \r won't get imported. Used
978  *		to import text files created with editors which are using CRLF
979  *		for line endings. Only effective in addition to -t.
980  *	-b:	assume binary format ('\0' separated, "\0\0" terminated)
981  *	-c:	assume checksum protected environment format
982  *	addr:	memory address to read from
983  *	size:	length of input data; if missing, proper '\0'
984  *		termination is mandatory
985  */
986 static int do_env_import(cmd_tbl_t *cmdtp, int flag,
987 			 int argc, char * const argv[])
988 {
989 	ulong	addr;
990 	char	*cmd, *ptr;
991 	char	sep = '\n';
992 	int	chk = 0;
993 	int	fmt = 0;
994 	int	del = 0;
995 	int	crlf_is_lf = 0;
996 	size_t	size;
997 
998 	cmd = *argv;
999 
1000 	while (--argc > 0 && **++argv == '-') {
1001 		char *arg = *argv;
1002 		while (*++arg) {
1003 			switch (*arg) {
1004 			case 'b':		/* raw binary format */
1005 				if (fmt++)
1006 					goto sep_err;
1007 				sep = '\0';
1008 				break;
1009 			case 'c':		/* external checksum format */
1010 				if (fmt++)
1011 					goto sep_err;
1012 				sep = '\0';
1013 				chk = 1;
1014 				break;
1015 			case 't':		/* text format */
1016 				if (fmt++)
1017 					goto sep_err;
1018 				sep = '\n';
1019 				break;
1020 			case 'r':		/* handle CRLF like LF */
1021 				crlf_is_lf = 1;
1022 				break;
1023 			case 'd':
1024 				del = 1;
1025 				break;
1026 			default:
1027 				return CMD_RET_USAGE;
1028 			}
1029 		}
1030 	}
1031 
1032 	if (argc < 1)
1033 		return CMD_RET_USAGE;
1034 
1035 	if (!fmt)
1036 		printf("## Warning: defaulting to text format\n");
1037 
1038 	if (sep != '\n' && crlf_is_lf )
1039 		crlf_is_lf = 0;
1040 
1041 	addr = simple_strtoul(argv[0], NULL, 16);
1042 	ptr = map_sysmem(addr, 0);
1043 
1044 	if (argc == 2) {
1045 		size = simple_strtoul(argv[1], NULL, 16);
1046 	} else if (argc == 1 && chk) {
1047 		puts("## Error: external checksum format must pass size\n");
1048 		return CMD_RET_FAILURE;
1049 	} else {
1050 		char *s = ptr;
1051 
1052 		size = 0;
1053 
1054 		while (size < MAX_ENV_SIZE) {
1055 			if ((*s == sep) && (*(s+1) == '\0'))
1056 				break;
1057 			++s;
1058 			++size;
1059 		}
1060 		if (size == MAX_ENV_SIZE) {
1061 			printf("## Warning: Input data exceeds %d bytes"
1062 				" - truncated\n", MAX_ENV_SIZE);
1063 		}
1064 		size += 2;
1065 		printf("## Info: input data size = %zu = 0x%zX\n", size, size);
1066 	}
1067 
1068 	if (chk) {
1069 		uint32_t crc;
1070 		env_t *ep = (env_t *)ptr;
1071 
1072 		size -= offsetof(env_t, data);
1073 		memcpy(&crc, &ep->crc, sizeof(crc));
1074 
1075 		if (crc32(0, ep->data, size) != crc) {
1076 			puts("## Error: bad CRC, import failed\n");
1077 			return 1;
1078 		}
1079 		ptr = (char *)ep->data;
1080 	}
1081 
1082 	if (himport_r(&env_htab, ptr, size, sep, del ? 0 : H_NOCLEAR,
1083 			crlf_is_lf, 0, NULL) == 0) {
1084 		error("Environment import failed: errno = %d\n", errno);
1085 		return 1;
1086 	}
1087 	gd->flags |= GD_FLG_ENV_READY;
1088 
1089 	return 0;
1090 
1091 sep_err:
1092 	printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
1093 		cmd);
1094 	return 1;
1095 }
1096 #endif
1097 
1098 #if defined(CONFIG_CMD_ENV_EXISTS)
1099 static int do_env_exists(cmd_tbl_t *cmdtp, int flag, int argc,
1100 		       char * const argv[])
1101 {
1102 	ENTRY e, *ep;
1103 
1104 	if (argc < 2)
1105 		return CMD_RET_USAGE;
1106 
1107 	e.key = argv[1];
1108 	e.data = NULL;
1109 	hsearch_r(e, FIND, &ep, &env_htab, 0);
1110 
1111 	return (ep == NULL) ? 1 : 0;
1112 }
1113 #endif
1114 
1115 /*
1116  * New command line interface: "env" command with subcommands
1117  */
1118 static cmd_tbl_t cmd_env_sub[] = {
1119 #if defined(CONFIG_CMD_ASKENV)
1120 	U_BOOT_CMD_MKENT(ask, CONFIG_SYS_MAXARGS, 1, do_env_ask, "", ""),
1121 #endif
1122 	U_BOOT_CMD_MKENT(default, 1, 0, do_env_default, "", ""),
1123 	U_BOOT_CMD_MKENT(delete, CONFIG_SYS_MAXARGS, 0, do_env_delete, "", ""),
1124 #if defined(CONFIG_CMD_EDITENV)
1125 	U_BOOT_CMD_MKENT(edit, 2, 0, do_env_edit, "", ""),
1126 #endif
1127 #if defined(CONFIG_CMD_ENV_CALLBACK)
1128 	U_BOOT_CMD_MKENT(callbacks, 1, 0, do_env_callback, "", ""),
1129 #endif
1130 #if defined(CONFIG_CMD_ENV_FLAGS)
1131 	U_BOOT_CMD_MKENT(flags, 1, 0, do_env_flags, "", ""),
1132 #endif
1133 #if defined(CONFIG_CMD_EXPORTENV)
1134 	U_BOOT_CMD_MKENT(export, 4, 0, do_env_export, "", ""),
1135 #endif
1136 #if defined(CONFIG_CMD_GREPENV)
1137 	U_BOOT_CMD_MKENT(grep, CONFIG_SYS_MAXARGS, 1, do_env_grep, "", ""),
1138 #endif
1139 #if defined(CONFIG_CMD_IMPORTENV)
1140 	U_BOOT_CMD_MKENT(import, 5, 0, do_env_import, "", ""),
1141 #endif
1142 	U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
1143 #if defined(CONFIG_CMD_RUN)
1144 	U_BOOT_CMD_MKENT(run, CONFIG_SYS_MAXARGS, 1, do_run, "", ""),
1145 #endif
1146 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1147 	U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
1148 #endif
1149 	U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
1150 #if defined(CONFIG_CMD_ENV_EXISTS)
1151 	U_BOOT_CMD_MKENT(exists, 2, 0, do_env_exists, "", ""),
1152 #endif
1153 };
1154 
1155 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
1156 void env_reloc(void)
1157 {
1158 	fixup_cmdtable(cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1159 }
1160 #endif
1161 
1162 static int do_env(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
1163 {
1164 	cmd_tbl_t *cp;
1165 
1166 	if (argc < 2)
1167 		return CMD_RET_USAGE;
1168 
1169 	/* drop initial "env" arg */
1170 	argc--;
1171 	argv++;
1172 
1173 	cp = find_cmd_tbl(argv[0], cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1174 
1175 	if (cp)
1176 		return cp->cmd(cmdtp, flag, argc, argv);
1177 
1178 	return CMD_RET_USAGE;
1179 }
1180 
1181 #ifdef CONFIG_SYS_LONGHELP
1182 static char env_help_text[] =
1183 #if defined(CONFIG_CMD_ASKENV)
1184 	"ask name [message] [size] - ask for environment variable\nenv "
1185 #endif
1186 #if defined(CONFIG_CMD_ENV_CALLBACK)
1187 	"callbacks - print callbacks and their associated variables\nenv "
1188 #endif
1189 	"default [-f] -a - [forcibly] reset default environment\n"
1190 	"env default [-f] var [...] - [forcibly] reset variable(s) to their default values\n"
1191 	"env delete [-f] var [...] - [forcibly] delete variable(s)\n"
1192 #if defined(CONFIG_CMD_EDITENV)
1193 	"env edit name - edit environment variable\n"
1194 #endif
1195 #if defined(CONFIG_CMD_ENV_EXISTS)
1196 	"env exists name - tests for existence of variable\n"
1197 #endif
1198 #if defined(CONFIG_CMD_EXPORTENV)
1199 	"env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
1200 #endif
1201 #if defined(CONFIG_CMD_ENV_FLAGS)
1202 	"env flags - print variables that have non-default flags\n"
1203 #endif
1204 #if defined(CONFIG_CMD_GREPENV)
1205 #ifdef CONFIG_REGEX
1206 	"env grep [-e] [-n | -v | -b] string [...] - search environment\n"
1207 #else
1208 	"env grep [-n | -v | -b] string [...] - search environment\n"
1209 #endif
1210 #endif
1211 #if defined(CONFIG_CMD_IMPORTENV)
1212 	"env import [-d] [-t [-r] | -b | -c] addr [size] - import environment\n"
1213 #endif
1214 	"env print [-a | name ...] - print environment\n"
1215 #if defined(CONFIG_CMD_RUN)
1216 	"env run var [...] - run commands in an environment variable\n"
1217 #endif
1218 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1219 	"env save - save environment\n"
1220 #endif
1221 	"env set [-f] name [arg ...]\n";
1222 #endif
1223 
1224 U_BOOT_CMD(
1225 	env, CONFIG_SYS_MAXARGS, 1, do_env,
1226 	"environment handling commands", env_help_text
1227 );
1228 
1229 /*
1230  * Old command line interface, kept for compatibility
1231  */
1232 
1233 #if defined(CONFIG_CMD_EDITENV)
1234 U_BOOT_CMD_COMPLETE(
1235 	editenv, 2, 0,	do_env_edit,
1236 	"edit environment variable",
1237 	"name\n"
1238 	"    - edit environment variable 'name'",
1239 	var_complete
1240 );
1241 #endif
1242 
1243 U_BOOT_CMD_COMPLETE(
1244 	printenv, CONFIG_SYS_MAXARGS, 1,	do_env_print,
1245 	"print environment variables",
1246 	"[-a]\n    - print [all] values of all environment variables\n"
1247 	"printenv name ...\n"
1248 	"    - print value of environment variable 'name'",
1249 	var_complete
1250 );
1251 
1252 #ifdef CONFIG_CMD_GREPENV
1253 U_BOOT_CMD_COMPLETE(
1254 	grepenv, CONFIG_SYS_MAXARGS, 0,  do_env_grep,
1255 	"search environment variables",
1256 #ifdef CONFIG_REGEX
1257 	"[-e] [-n | -v | -b] string ...\n"
1258 #else
1259 	"[-n | -v | -b] string ...\n"
1260 #endif
1261 	"    - list environment name=value pairs matching 'string'\n"
1262 #ifdef CONFIG_REGEX
1263 	"      \"-e\": enable regular expressions;\n"
1264 #endif
1265 	"      \"-n\": search variable names; \"-v\": search values;\n"
1266 	"      \"-b\": search both names and values (default)",
1267 	var_complete
1268 );
1269 #endif
1270 
1271 U_BOOT_CMD_COMPLETE(
1272 	setenv, CONFIG_SYS_MAXARGS, 0,	do_env_set,
1273 	"set environment variables",
1274 	"[-f] name value ...\n"
1275 	"    - [forcibly] set environment variable 'name' to 'value ...'\n"
1276 	"setenv [-f] name\n"
1277 	"    - [forcibly] delete environment variable 'name'",
1278 	var_complete
1279 );
1280 
1281 #if defined(CONFIG_CMD_ASKENV)
1282 
1283 U_BOOT_CMD(
1284 	askenv,	CONFIG_SYS_MAXARGS,	1,	do_env_ask,
1285 	"get environment variables from stdin",
1286 	"name [message] [size]\n"
1287 	"    - get environment variable 'name' from stdin (max 'size' chars)"
1288 );
1289 #endif
1290 
1291 #if defined(CONFIG_CMD_RUN)
1292 U_BOOT_CMD_COMPLETE(
1293 	run,	CONFIG_SYS_MAXARGS,	1,	do_run,
1294 	"run commands in an environment variable",
1295 	"var [...]\n"
1296 	"    - run the commands in the environment variable(s) 'var'",
1297 	var_complete
1298 );
1299 #endif
1300 #endif /* CONFIG_SPL_BUILD */
1301