xref: /openbmc/u-boot/cmd/nvedit.c (revision 310fb14b) 
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|MMC|FAT|EXT4|\
58 NAND|NVRAM|ONENAND|SATA|SPI_FLASH|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 
238 	if (strchr(name, '=')) {
239 		printf("## Error: illegal character '='"
240 		       "in variable name \"%s\"\n", name);
241 		return 1;
242 	}
243 
244 	env_id++;
245 
246 	/* Delete only ? */
247 	if (argc < 3 || argv[2] == NULL) {
248 		int rc = hdelete_r(name, &env_htab, env_flag);
249 		return !rc;
250 	}
251 
252 	/*
253 	 * Insert / replace new value
254 	 */
255 	for (i = 2, len = 0; i < argc; ++i)
256 		len += strlen(argv[i]) + 1;
257 
258 	value = malloc(len);
259 	if (value == NULL) {
260 		printf("## Can't malloc %d bytes\n", len);
261 		return 1;
262 	}
263 	for (i = 2, s = value; i < argc; ++i) {
264 		char *v = argv[i];
265 
266 		while ((*s++ = *v++) != '\0')
267 			;
268 		*(s - 1) = ' ';
269 	}
270 	if (s != value)
271 		*--s = '\0';
272 
273 	e.key	= name;
274 	e.data	= value;
275 	hsearch_r(e, ENTER, &ep, &env_htab, env_flag);
276 	free(value);
277 	if (!ep) {
278 		printf("## Error inserting \"%s\" variable, errno=%d\n",
279 			name, errno);
280 		return 1;
281 	}
282 
283 	return 0;
284 }
285 
286 int setenv(const char *varname, const char *varvalue)
287 {
288 	const char * const argv[4] = { "setenv", varname, varvalue, NULL };
289 
290 	/* before import into hashtable */
291 	if (!(gd->flags & GD_FLG_ENV_READY))
292 		return 1;
293 
294 	if (varvalue == NULL || varvalue[0] == '\0')
295 		return _do_env_set(0, 2, (char * const *)argv, H_PROGRAMMATIC);
296 	else
297 		return _do_env_set(0, 3, (char * const *)argv, H_PROGRAMMATIC);
298 }
299 
300 /**
301  * Set an environment variable to an integer value
302  *
303  * @param varname	Environment variable to set
304  * @param value		Value to set it to
305  * @return 0 if ok, 1 on error
306  */
307 int setenv_ulong(const char *varname, ulong value)
308 {
309 	/* TODO: this should be unsigned */
310 	char *str = simple_itoa(value);
311 
312 	return setenv(varname, str);
313 }
314 
315 /**
316  * Set an environment variable to an value in hex
317  *
318  * @param varname	Environment variable to set
319  * @param value		Value to set it to
320  * @return 0 if ok, 1 on error
321  */
322 int setenv_hex(const char *varname, ulong value)
323 {
324 	char str[17];
325 
326 	sprintf(str, "%lx", value);
327 	return setenv(varname, str);
328 }
329 
330 ulong getenv_hex(const char *varname, ulong default_val)
331 {
332 	const char *s;
333 	ulong value;
334 	char *endp;
335 
336 	s = getenv(varname);
337 	if (s)
338 		value = simple_strtoul(s, &endp, 16);
339 	if (!s || endp == s)
340 		return default_val;
341 
342 	return value;
343 }
344 
345 #ifndef CONFIG_SPL_BUILD
346 static int do_env_set(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
347 {
348 	if (argc < 2)
349 		return CMD_RET_USAGE;
350 
351 	return _do_env_set(flag, argc, argv, H_INTERACTIVE);
352 }
353 
354 /*
355  * Prompt for environment variable
356  */
357 #if defined(CONFIG_CMD_ASKENV)
358 int do_env_ask(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
359 {
360 	char message[CONFIG_SYS_CBSIZE];
361 	int i, len, pos, size;
362 	char *local_args[4];
363 	char *endptr;
364 
365 	local_args[0] = argv[0];
366 	local_args[1] = argv[1];
367 	local_args[2] = NULL;
368 	local_args[3] = NULL;
369 
370 	/*
371 	 * Check the syntax:
372 	 *
373 	 * env_ask envname [message1 ...] [size]
374 	 */
375 	if (argc == 1)
376 		return CMD_RET_USAGE;
377 
378 	/*
379 	 * We test the last argument if it can be converted
380 	 * into a decimal number.  If yes, we assume it's
381 	 * the size.  Otherwise we echo it as part of the
382 	 * message.
383 	 */
384 	i = simple_strtoul(argv[argc - 1], &endptr, 10);
385 	if (*endptr != '\0') {			/* no size */
386 		size = CONFIG_SYS_CBSIZE - 1;
387 	} else {				/* size given */
388 		size = i;
389 		--argc;
390 	}
391 
392 	if (argc <= 2) {
393 		sprintf(message, "Please enter '%s': ", argv[1]);
394 	} else {
395 		/* env_ask envname message1 ... messagen [size] */
396 		for (i = 2, pos = 0; i < argc; i++) {
397 			if (pos)
398 				message[pos++] = ' ';
399 
400 			strcpy(message + pos, argv[i]);
401 			pos += strlen(argv[i]);
402 		}
403 		message[pos++] = ' ';
404 		message[pos] = '\0';
405 	}
406 
407 	if (size >= CONFIG_SYS_CBSIZE)
408 		size = CONFIG_SYS_CBSIZE - 1;
409 
410 	if (size <= 0)
411 		return 1;
412 
413 	/* prompt for input */
414 	len = cli_readline(message);
415 
416 	if (size < len)
417 		console_buffer[size] = '\0';
418 
419 	len = 2;
420 	if (console_buffer[0] != '\0') {
421 		local_args[2] = console_buffer;
422 		len = 3;
423 	}
424 
425 	/* Continue calling setenv code */
426 	return _do_env_set(flag, len, local_args, H_INTERACTIVE);
427 }
428 #endif
429 
430 #if defined(CONFIG_CMD_ENV_CALLBACK)
431 static int print_static_binding(const char *var_name, const char *callback_name,
432 				void *priv)
433 {
434 	printf("\t%-20s %-20s\n", var_name, callback_name);
435 
436 	return 0;
437 }
438 
439 static int print_active_callback(ENTRY *entry)
440 {
441 	struct env_clbk_tbl *clbkp;
442 	int i;
443 	int num_callbacks;
444 
445 	if (entry->callback == NULL)
446 		return 0;
447 
448 	/* look up the callback in the linker-list */
449 	num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
450 	for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
451 	     i < num_callbacks;
452 	     i++, clbkp++) {
453 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
454 		if (entry->callback == clbkp->callback + gd->reloc_off)
455 #else
456 		if (entry->callback == clbkp->callback)
457 #endif
458 			break;
459 	}
460 
461 	if (i == num_callbacks)
462 		/* this should probably never happen, but just in case... */
463 		printf("\t%-20s %p\n", entry->key, entry->callback);
464 	else
465 		printf("\t%-20s %-20s\n", entry->key, clbkp->name);
466 
467 	return 0;
468 }
469 
470 /*
471  * Print the callbacks available and what they are bound to
472  */
473 int do_env_callback(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
474 {
475 	struct env_clbk_tbl *clbkp;
476 	int i;
477 	int num_callbacks;
478 
479 	/* Print the available callbacks */
480 	puts("Available callbacks:\n");
481 	puts("\tCallback Name\n");
482 	puts("\t-------------\n");
483 	num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
484 	for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
485 	     i < num_callbacks;
486 	     i++, clbkp++)
487 		printf("\t%s\n", clbkp->name);
488 	puts("\n");
489 
490 	/* Print the static bindings that may exist */
491 	puts("Static callback bindings:\n");
492 	printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
493 	printf("\t%-20s %-20s\n", "-------------", "-------------");
494 	env_attr_walk(ENV_CALLBACK_LIST_STATIC, print_static_binding, NULL);
495 	puts("\n");
496 
497 	/* walk through each variable and print the callback if it has one */
498 	puts("Active callback bindings:\n");
499 	printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
500 	printf("\t%-20s %-20s\n", "-------------", "-------------");
501 	hwalk_r(&env_htab, print_active_callback);
502 	return 0;
503 }
504 #endif
505 
506 #if defined(CONFIG_CMD_ENV_FLAGS)
507 static int print_static_flags(const char *var_name, const char *flags,
508 			      void *priv)
509 {
510 	enum env_flags_vartype type = env_flags_parse_vartype(flags);
511 	enum env_flags_varaccess access = env_flags_parse_varaccess(flags);
512 
513 	printf("\t%-20s %-20s %-20s\n", var_name,
514 		env_flags_get_vartype_name(type),
515 		env_flags_get_varaccess_name(access));
516 
517 	return 0;
518 }
519 
520 static int print_active_flags(ENTRY *entry)
521 {
522 	enum env_flags_vartype type;
523 	enum env_flags_varaccess access;
524 
525 	if (entry->flags == 0)
526 		return 0;
527 
528 	type = (enum env_flags_vartype)
529 		(entry->flags & ENV_FLAGS_VARTYPE_BIN_MASK);
530 	access = env_flags_parse_varaccess_from_binflags(entry->flags);
531 	printf("\t%-20s %-20s %-20s\n", entry->key,
532 		env_flags_get_vartype_name(type),
533 		env_flags_get_varaccess_name(access));
534 
535 	return 0;
536 }
537 
538 /*
539  * Print the flags available and what variables have flags
540  */
541 int do_env_flags(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
542 {
543 	/* Print the available variable types */
544 	printf("Available variable type flags (position %d):\n",
545 		ENV_FLAGS_VARTYPE_LOC);
546 	puts("\tFlag\tVariable Type Name\n");
547 	puts("\t----\t------------------\n");
548 	env_flags_print_vartypes();
549 	puts("\n");
550 
551 	/* Print the available variable access types */
552 	printf("Available variable access flags (position %d):\n",
553 		ENV_FLAGS_VARACCESS_LOC);
554 	puts("\tFlag\tVariable Access Name\n");
555 	puts("\t----\t--------------------\n");
556 	env_flags_print_varaccess();
557 	puts("\n");
558 
559 	/* Print the static flags that may exist */
560 	puts("Static flags:\n");
561 	printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
562 		"Variable Access");
563 	printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
564 		"---------------");
565 	env_attr_walk(ENV_FLAGS_LIST_STATIC, print_static_flags, NULL);
566 	puts("\n");
567 
568 	/* walk through each variable and print the flags if non-default */
569 	puts("Active flags:\n");
570 	printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
571 		"Variable Access");
572 	printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
573 		"---------------");
574 	hwalk_r(&env_htab, print_active_flags);
575 	return 0;
576 }
577 #endif
578 
579 /*
580  * Interactively edit an environment variable
581  */
582 #if defined(CONFIG_CMD_EDITENV)
583 static int do_env_edit(cmd_tbl_t *cmdtp, int flag, int argc,
584 		       char * const argv[])
585 {
586 	char buffer[CONFIG_SYS_CBSIZE];
587 	char *init_val;
588 
589 	if (argc < 2)
590 		return CMD_RET_USAGE;
591 
592 	/* before import into hashtable */
593 	if (!(gd->flags & GD_FLG_ENV_READY))
594 		return 1;
595 
596 	/* Set read buffer to initial value or empty sting */
597 	init_val = getenv(argv[1]);
598 	if (init_val)
599 		snprintf(buffer, CONFIG_SYS_CBSIZE, "%s", init_val);
600 	else
601 		buffer[0] = '\0';
602 
603 	if (cli_readline_into_buffer("edit: ", buffer, 0) < 0)
604 		return 1;
605 
606 	if (buffer[0] == '\0') {
607 		const char * const _argv[3] = { "setenv", argv[1], NULL };
608 
609 		return _do_env_set(0, 2, (char * const *)_argv, H_INTERACTIVE);
610 	} else {
611 		const char * const _argv[4] = { "setenv", argv[1], buffer,
612 			NULL };
613 
614 		return _do_env_set(0, 3, (char * const *)_argv, H_INTERACTIVE);
615 	}
616 }
617 #endif /* CONFIG_CMD_EDITENV */
618 #endif /* CONFIG_SPL_BUILD */
619 
620 /*
621  * Look up variable from environment,
622  * return address of storage for that variable,
623  * or NULL if not found
624  */
625 char *getenv(const char *name)
626 {
627 	if (gd->flags & GD_FLG_ENV_READY) { /* after import into hashtable */
628 		ENTRY e, *ep;
629 
630 		WATCHDOG_RESET();
631 
632 		e.key	= name;
633 		e.data	= NULL;
634 		hsearch_r(e, FIND, &ep, &env_htab, 0);
635 
636 		return ep ? ep->data : NULL;
637 	}
638 
639 	/* restricted capabilities before import */
640 	if (getenv_f(name, (char *)(gd->env_buf), sizeof(gd->env_buf)) > 0)
641 		return (char *)(gd->env_buf);
642 
643 	return NULL;
644 }
645 
646 /*
647  * Look up variable from environment for restricted C runtime env.
648  */
649 int getenv_f(const char *name, char *buf, unsigned len)
650 {
651 	int i, nxt;
652 
653 	for (i = 0; env_get_char(i) != '\0'; i = nxt + 1) {
654 		int val, n;
655 
656 		for (nxt = i; env_get_char(nxt) != '\0'; ++nxt) {
657 			if (nxt >= CONFIG_ENV_SIZE)
658 				return -1;
659 		}
660 
661 		val = envmatch((uchar *)name, i);
662 		if (val < 0)
663 			continue;
664 
665 		/* found; copy out */
666 		for (n = 0; n < len; ++n, ++buf) {
667 			*buf = env_get_char(val++);
668 			if (*buf == '\0')
669 				return n;
670 		}
671 
672 		if (n)
673 			*--buf = '\0';
674 
675 		printf("env_buf [%d bytes] too small for value of \"%s\"\n",
676 			len, name);
677 
678 		return n;
679 	}
680 
681 	return -1;
682 }
683 
684 /**
685  * Decode the integer value of an environment variable and return it.
686  *
687  * @param name		Name of environemnt variable
688  * @param base		Number base to use (normally 10, or 16 for hex)
689  * @param default_val	Default value to return if the variable is not
690  *			found
691  * @return the decoded value, or default_val if not found
692  */
693 ulong getenv_ulong(const char *name, int base, ulong default_val)
694 {
695 	/*
696 	 * We can use getenv() here, even before relocation, since the
697 	 * environment variable value is an integer and thus short.
698 	 */
699 	const char *str = getenv(name);
700 
701 	return str ? simple_strtoul(str, NULL, base) : default_val;
702 }
703 
704 #ifndef CONFIG_SPL_BUILD
705 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
706 static int do_env_save(cmd_tbl_t *cmdtp, int flag, int argc,
707 		       char * const argv[])
708 {
709 	struct env_driver *env = env_driver_lookup_default();
710 
711 	printf("Saving Environment to %s...\n", env->name);
712 
713 	return saveenv() ? 1 : 0;
714 }
715 
716 U_BOOT_CMD(
717 	saveenv, 1, 0,	do_env_save,
718 	"save environment variables to persistent storage",
719 	""
720 );
721 #endif
722 #endif /* CONFIG_SPL_BUILD */
723 
724 
725 /*
726  * Match a name / name=value pair
727  *
728  * s1 is either a simple 'name', or a 'name=value' pair.
729  * i2 is the environment index for a 'name2=value2' pair.
730  * If the names match, return the index for the value2, else -1.
731  */
732 int envmatch(uchar *s1, int i2)
733 {
734 	if (s1 == NULL)
735 		return -1;
736 
737 	while (*s1 == env_get_char(i2++))
738 		if (*s1++ == '=')
739 			return i2;
740 
741 	if (*s1 == '\0' && env_get_char(i2-1) == '=')
742 		return i2;
743 
744 	return -1;
745 }
746 
747 #ifndef CONFIG_SPL_BUILD
748 static int do_env_default(cmd_tbl_t *cmdtp, int __flag,
749 			  int argc, char * const argv[])
750 {
751 	int all = 0, flag = 0;
752 
753 	debug("Initial value for argc=%d\n", argc);
754 	while (--argc > 0 && **++argv == '-') {
755 		char *arg = *argv;
756 
757 		while (*++arg) {
758 			switch (*arg) {
759 			case 'a':		/* default all */
760 				all = 1;
761 				break;
762 			case 'f':		/* force */
763 				flag |= H_FORCE;
764 				break;
765 			default:
766 				return cmd_usage(cmdtp);
767 			}
768 		}
769 	}
770 	debug("Final value for argc=%d\n", argc);
771 	if (all && (argc == 0)) {
772 		/* Reset the whole environment */
773 		set_default_env("## Resetting to default environment\n");
774 		return 0;
775 	}
776 	if (!all && (argc > 0)) {
777 		/* Reset individual variables */
778 		set_default_vars(argc, argv);
779 		return 0;
780 	}
781 
782 	return cmd_usage(cmdtp);
783 }
784 
785 static int do_env_delete(cmd_tbl_t *cmdtp, int flag,
786 			 int argc, char * const argv[])
787 {
788 	int env_flag = H_INTERACTIVE;
789 	int ret = 0;
790 
791 	debug("Initial value for argc=%d\n", argc);
792 	while (argc > 1 && **(argv + 1) == '-') {
793 		char *arg = *++argv;
794 
795 		--argc;
796 		while (*++arg) {
797 			switch (*arg) {
798 			case 'f':		/* force */
799 				env_flag |= H_FORCE;
800 				break;
801 			default:
802 				return CMD_RET_USAGE;
803 			}
804 		}
805 	}
806 	debug("Final value for argc=%d\n", argc);
807 
808 	env_id++;
809 
810 	while (--argc > 0) {
811 		char *name = *++argv;
812 
813 		if (!hdelete_r(name, &env_htab, env_flag))
814 			ret = 1;
815 	}
816 
817 	return ret;
818 }
819 
820 #ifdef CONFIG_CMD_EXPORTENV
821 /*
822  * env export [-t | -b | -c] [-s size] addr [var ...]
823  *	-t:	export as text format; if size is given, data will be
824  *		padded with '\0' bytes; if not, one terminating '\0'
825  *		will be added (which is included in the "filesize"
826  *		setting so you can for exmple copy this to flash and
827  *		keep the termination).
828  *	-b:	export as binary format (name=value pairs separated by
829  *		'\0', list end marked by double "\0\0")
830  *	-c:	export as checksum protected environment format as
831  *		used for example by "saveenv" command
832  *	-s size:
833  *		size of output buffer
834  *	addr:	memory address where environment gets stored
835  *	var...	List of variable names that get included into the
836  *		export. Without arguments, the whole environment gets
837  *		exported.
838  *
839  * With "-c" and size is NOT given, then the export command will
840  * format the data as currently used for the persistent storage,
841  * i. e. it will use CONFIG_ENV_SECT_SIZE as output block size and
842  * prepend a valid CRC32 checksum and, in case of redundant
843  * environment, a "current" redundancy flag. If size is given, this
844  * value will be used instead of CONFIG_ENV_SECT_SIZE; again, CRC32
845  * checksum and redundancy flag will be inserted.
846  *
847  * With "-b" and "-t", always only the real data (including a
848  * terminating '\0' byte) will be written; here the optional size
849  * argument will be used to make sure not to overflow the user
850  * provided buffer; the command will abort if the size is not
851  * sufficient. Any remaining space will be '\0' padded.
852  *
853  * On successful return, the variable "filesize" will be set.
854  * Note that filesize includes the trailing/terminating '\0' byte(s).
855  *
856  * Usage scenario:  create a text snapshot/backup of the current settings:
857  *
858  *	=> env export -t 100000
859  *	=> era ${backup_addr} +${filesize}
860  *	=> cp.b 100000 ${backup_addr} ${filesize}
861  *
862  * Re-import this snapshot, deleting all other settings:
863  *
864  *	=> env import -d -t ${backup_addr}
865  */
866 static int do_env_export(cmd_tbl_t *cmdtp, int flag,
867 			 int argc, char * const argv[])
868 {
869 	char	buf[32];
870 	ulong	addr;
871 	char	*ptr, *cmd, *res;
872 	size_t	size = 0;
873 	ssize_t	len;
874 	env_t	*envp;
875 	char	sep = '\n';
876 	int	chk = 0;
877 	int	fmt = 0;
878 
879 	cmd = *argv;
880 
881 	while (--argc > 0 && **++argv == '-') {
882 		char *arg = *argv;
883 		while (*++arg) {
884 			switch (*arg) {
885 			case 'b':		/* raw binary format */
886 				if (fmt++)
887 					goto sep_err;
888 				sep = '\0';
889 				break;
890 			case 'c':		/* external checksum format */
891 				if (fmt++)
892 					goto sep_err;
893 				sep = '\0';
894 				chk = 1;
895 				break;
896 			case 's':		/* size given */
897 				if (--argc <= 0)
898 					return cmd_usage(cmdtp);
899 				size = simple_strtoul(*++argv, NULL, 16);
900 				goto NXTARG;
901 			case 't':		/* text format */
902 				if (fmt++)
903 					goto sep_err;
904 				sep = '\n';
905 				break;
906 			default:
907 				return CMD_RET_USAGE;
908 			}
909 		}
910 NXTARG:		;
911 	}
912 
913 	if (argc < 1)
914 		return CMD_RET_USAGE;
915 
916 	addr = simple_strtoul(argv[0], NULL, 16);
917 	ptr = map_sysmem(addr, size);
918 
919 	if (size)
920 		memset(ptr, '\0', size);
921 
922 	argc--;
923 	argv++;
924 
925 	if (sep) {		/* export as text file */
926 		len = hexport_r(&env_htab, sep,
927 				H_MATCH_KEY | H_MATCH_IDENT,
928 				&ptr, size, argc, argv);
929 		if (len < 0) {
930 			error("Cannot export environment: errno = %d\n", errno);
931 			return 1;
932 		}
933 		sprintf(buf, "%zX", (size_t)len);
934 		setenv("filesize", buf);
935 
936 		return 0;
937 	}
938 
939 	envp = (env_t *)ptr;
940 
941 	if (chk)		/* export as checksum protected block */
942 		res = (char *)envp->data;
943 	else			/* export as raw binary data */
944 		res = ptr;
945 
946 	len = hexport_r(&env_htab, '\0',
947 			H_MATCH_KEY | H_MATCH_IDENT,
948 			&res, ENV_SIZE, argc, argv);
949 	if (len < 0) {
950 		error("Cannot export environment: errno = %d\n", errno);
951 		return 1;
952 	}
953 
954 	if (chk) {
955 		envp->crc = crc32(0, envp->data, ENV_SIZE);
956 #ifdef CONFIG_ENV_ADDR_REDUND
957 		envp->flags = ACTIVE_FLAG;
958 #endif
959 	}
960 	setenv_hex("filesize", len + offsetof(env_t, data));
961 
962 	return 0;
963 
964 sep_err:
965 	printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",	cmd);
966 	return 1;
967 }
968 #endif
969 
970 #ifdef CONFIG_CMD_IMPORTENV
971 /*
972  * env import [-d] [-t [-r] | -b | -c] addr [size]
973  *	-d:	delete existing environment before importing;
974  *		otherwise overwrite / append to existing definitions
975  *	-t:	assume text format; either "size" must be given or the
976  *		text data must be '\0' terminated
977  *	-r:	handle CRLF like LF, that means exported variables with
978  *		a content which ends with \r won't get imported. Used
979  *		to import text files created with editors which are using CRLF
980  *		for line endings. Only effective in addition to -t.
981  *	-b:	assume binary format ('\0' separated, "\0\0" terminated)
982  *	-c:	assume checksum protected environment format
983  *	addr:	memory address to read from
984  *	size:	length of input data; if missing, proper '\0'
985  *		termination is mandatory
986  */
987 static int do_env_import(cmd_tbl_t *cmdtp, int flag,
988 			 int argc, char * const argv[])
989 {
990 	ulong	addr;
991 	char	*cmd, *ptr;
992 	char	sep = '\n';
993 	int	chk = 0;
994 	int	fmt = 0;
995 	int	del = 0;
996 	int	crlf_is_lf = 0;
997 	size_t	size;
998 
999 	cmd = *argv;
1000 
1001 	while (--argc > 0 && **++argv == '-') {
1002 		char *arg = *argv;
1003 		while (*++arg) {
1004 			switch (*arg) {
1005 			case 'b':		/* raw binary format */
1006 				if (fmt++)
1007 					goto sep_err;
1008 				sep = '\0';
1009 				break;
1010 			case 'c':		/* external checksum format */
1011 				if (fmt++)
1012 					goto sep_err;
1013 				sep = '\0';
1014 				chk = 1;
1015 				break;
1016 			case 't':		/* text format */
1017 				if (fmt++)
1018 					goto sep_err;
1019 				sep = '\n';
1020 				break;
1021 			case 'r':		/* handle CRLF like LF */
1022 				crlf_is_lf = 1;
1023 				break;
1024 			case 'd':
1025 				del = 1;
1026 				break;
1027 			default:
1028 				return CMD_RET_USAGE;
1029 			}
1030 		}
1031 	}
1032 
1033 	if (argc < 1)
1034 		return CMD_RET_USAGE;
1035 
1036 	if (!fmt)
1037 		printf("## Warning: defaulting to text format\n");
1038 
1039 	if (sep != '\n' && crlf_is_lf )
1040 		crlf_is_lf = 0;
1041 
1042 	addr = simple_strtoul(argv[0], NULL, 16);
1043 	ptr = map_sysmem(addr, 0);
1044 
1045 	if (argc == 2) {
1046 		size = simple_strtoul(argv[1], NULL, 16);
1047 	} else if (argc == 1 && chk) {
1048 		puts("## Error: external checksum format must pass size\n");
1049 		return CMD_RET_FAILURE;
1050 	} else {
1051 		char *s = ptr;
1052 
1053 		size = 0;
1054 
1055 		while (size < MAX_ENV_SIZE) {
1056 			if ((*s == sep) && (*(s+1) == '\0'))
1057 				break;
1058 			++s;
1059 			++size;
1060 		}
1061 		if (size == MAX_ENV_SIZE) {
1062 			printf("## Warning: Input data exceeds %d bytes"
1063 				" - truncated\n", MAX_ENV_SIZE);
1064 		}
1065 		size += 2;
1066 		printf("## Info: input data size = %zu = 0x%zX\n", size, size);
1067 	}
1068 
1069 	if (chk) {
1070 		uint32_t crc;
1071 		env_t *ep = (env_t *)ptr;
1072 
1073 		size -= offsetof(env_t, data);
1074 		memcpy(&crc, &ep->crc, sizeof(crc));
1075 
1076 		if (crc32(0, ep->data, size) != crc) {
1077 			puts("## Error: bad CRC, import failed\n");
1078 			return 1;
1079 		}
1080 		ptr = (char *)ep->data;
1081 	}
1082 
1083 	if (himport_r(&env_htab, ptr, size, sep, del ? 0 : H_NOCLEAR,
1084 			crlf_is_lf, 0, NULL) == 0) {
1085 		error("Environment import failed: errno = %d\n", errno);
1086 		return 1;
1087 	}
1088 	gd->flags |= GD_FLG_ENV_READY;
1089 
1090 	return 0;
1091 
1092 sep_err:
1093 	printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
1094 		cmd);
1095 	return 1;
1096 }
1097 #endif
1098 
1099 #if defined(CONFIG_CMD_ENV_EXISTS)
1100 static int do_env_exists(cmd_tbl_t *cmdtp, int flag, int argc,
1101 		       char * const argv[])
1102 {
1103 	ENTRY e, *ep;
1104 
1105 	if (argc < 2)
1106 		return CMD_RET_USAGE;
1107 
1108 	e.key = argv[1];
1109 	e.data = NULL;
1110 	hsearch_r(e, FIND, &ep, &env_htab, 0);
1111 
1112 	return (ep == NULL) ? 1 : 0;
1113 }
1114 #endif
1115 
1116 /*
1117  * New command line interface: "env" command with subcommands
1118  */
1119 static cmd_tbl_t cmd_env_sub[] = {
1120 #if defined(CONFIG_CMD_ASKENV)
1121 	U_BOOT_CMD_MKENT(ask, CONFIG_SYS_MAXARGS, 1, do_env_ask, "", ""),
1122 #endif
1123 	U_BOOT_CMD_MKENT(default, 1, 0, do_env_default, "", ""),
1124 	U_BOOT_CMD_MKENT(delete, CONFIG_SYS_MAXARGS, 0, do_env_delete, "", ""),
1125 #if defined(CONFIG_CMD_EDITENV)
1126 	U_BOOT_CMD_MKENT(edit, 2, 0, do_env_edit, "", ""),
1127 #endif
1128 #if defined(CONFIG_CMD_ENV_CALLBACK)
1129 	U_BOOT_CMD_MKENT(callbacks, 1, 0, do_env_callback, "", ""),
1130 #endif
1131 #if defined(CONFIG_CMD_ENV_FLAGS)
1132 	U_BOOT_CMD_MKENT(flags, 1, 0, do_env_flags, "", ""),
1133 #endif
1134 #if defined(CONFIG_CMD_EXPORTENV)
1135 	U_BOOT_CMD_MKENT(export, 4, 0, do_env_export, "", ""),
1136 #endif
1137 #if defined(CONFIG_CMD_GREPENV)
1138 	U_BOOT_CMD_MKENT(grep, CONFIG_SYS_MAXARGS, 1, do_env_grep, "", ""),
1139 #endif
1140 #if defined(CONFIG_CMD_IMPORTENV)
1141 	U_BOOT_CMD_MKENT(import, 5, 0, do_env_import, "", ""),
1142 #endif
1143 	U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
1144 #if defined(CONFIG_CMD_RUN)
1145 	U_BOOT_CMD_MKENT(run, CONFIG_SYS_MAXARGS, 1, do_run, "", ""),
1146 #endif
1147 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1148 	U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
1149 #endif
1150 	U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
1151 #if defined(CONFIG_CMD_ENV_EXISTS)
1152 	U_BOOT_CMD_MKENT(exists, 2, 0, do_env_exists, "", ""),
1153 #endif
1154 };
1155 
1156 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
1157 void env_reloc(void)
1158 {
1159 	fixup_cmdtable(cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1160 }
1161 #endif
1162 
1163 static int do_env(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
1164 {
1165 	cmd_tbl_t *cp;
1166 
1167 	if (argc < 2)
1168 		return CMD_RET_USAGE;
1169 
1170 	/* drop initial "env" arg */
1171 	argc--;
1172 	argv++;
1173 
1174 	cp = find_cmd_tbl(argv[0], cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
1175 
1176 	if (cp)
1177 		return cp->cmd(cmdtp, flag, argc, argv);
1178 
1179 	return CMD_RET_USAGE;
1180 }
1181 
1182 #ifdef CONFIG_SYS_LONGHELP
1183 static char env_help_text[] =
1184 #if defined(CONFIG_CMD_ASKENV)
1185 	"ask name [message] [size] - ask for environment variable\nenv "
1186 #endif
1187 #if defined(CONFIG_CMD_ENV_CALLBACK)
1188 	"callbacks - print callbacks and their associated variables\nenv "
1189 #endif
1190 	"default [-f] -a - [forcibly] reset default environment\n"
1191 	"env default [-f] var [...] - [forcibly] reset variable(s) to their default values\n"
1192 	"env delete [-f] var [...] - [forcibly] delete variable(s)\n"
1193 #if defined(CONFIG_CMD_EDITENV)
1194 	"env edit name - edit environment variable\n"
1195 #endif
1196 #if defined(CONFIG_CMD_ENV_EXISTS)
1197 	"env exists name - tests for existence of variable\n"
1198 #endif
1199 #if defined(CONFIG_CMD_EXPORTENV)
1200 	"env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
1201 #endif
1202 #if defined(CONFIG_CMD_ENV_FLAGS)
1203 	"env flags - print variables that have non-default flags\n"
1204 #endif
1205 #if defined(CONFIG_CMD_GREPENV)
1206 #ifdef CONFIG_REGEX
1207 	"env grep [-e] [-n | -v | -b] string [...] - search environment\n"
1208 #else
1209 	"env grep [-n | -v | -b] string [...] - search environment\n"
1210 #endif
1211 #endif
1212 #if defined(CONFIG_CMD_IMPORTENV)
1213 	"env import [-d] [-t [-r] | -b | -c] addr [size] - import environment\n"
1214 #endif
1215 	"env print [-a | name ...] - print environment\n"
1216 #if defined(CONFIG_CMD_RUN)
1217 	"env run var [...] - run commands in an environment variable\n"
1218 #endif
1219 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
1220 	"env save - save environment\n"
1221 #endif
1222 	"env set [-f] name [arg ...]\n";
1223 #endif
1224 
1225 U_BOOT_CMD(
1226 	env, CONFIG_SYS_MAXARGS, 1, do_env,
1227 	"environment handling commands", env_help_text
1228 );
1229 
1230 /*
1231  * Old command line interface, kept for compatibility
1232  */
1233 
1234 #if defined(CONFIG_CMD_EDITENV)
1235 U_BOOT_CMD_COMPLETE(
1236 	editenv, 2, 0,	do_env_edit,
1237 	"edit environment variable",
1238 	"name\n"
1239 	"    - edit environment variable 'name'",
1240 	var_complete
1241 );
1242 #endif
1243 
1244 U_BOOT_CMD_COMPLETE(
1245 	printenv, CONFIG_SYS_MAXARGS, 1,	do_env_print,
1246 	"print environment variables",
1247 	"[-a]\n    - print [all] values of all environment variables\n"
1248 	"printenv name ...\n"
1249 	"    - print value of environment variable 'name'",
1250 	var_complete
1251 );
1252 
1253 #ifdef CONFIG_CMD_GREPENV
1254 U_BOOT_CMD_COMPLETE(
1255 	grepenv, CONFIG_SYS_MAXARGS, 0,  do_env_grep,
1256 	"search environment variables",
1257 #ifdef CONFIG_REGEX
1258 	"[-e] [-n | -v | -b] string ...\n"
1259 #else
1260 	"[-n | -v | -b] string ...\n"
1261 #endif
1262 	"    - list environment name=value pairs matching 'string'\n"
1263 #ifdef CONFIG_REGEX
1264 	"      \"-e\": enable regular expressions;\n"
1265 #endif
1266 	"      \"-n\": search variable names; \"-v\": search values;\n"
1267 	"      \"-b\": search both names and values (default)",
1268 	var_complete
1269 );
1270 #endif
1271 
1272 U_BOOT_CMD_COMPLETE(
1273 	setenv, CONFIG_SYS_MAXARGS, 0,	do_env_set,
1274 	"set environment variables",
1275 	"[-f] name value ...\n"
1276 	"    - [forcibly] set environment variable 'name' to 'value ...'\n"
1277 	"setenv [-f] name\n"
1278 	"    - [forcibly] delete environment variable 'name'",
1279 	var_complete
1280 );
1281 
1282 #if defined(CONFIG_CMD_ASKENV)
1283 
1284 U_BOOT_CMD(
1285 	askenv,	CONFIG_SYS_MAXARGS,	1,	do_env_ask,
1286 	"get environment variables from stdin",
1287 	"name [message] [size]\n"
1288 	"    - get environment variable 'name' from stdin (max 'size' chars)"
1289 );
1290 #endif
1291 
1292 #if defined(CONFIG_CMD_RUN)
1293 U_BOOT_CMD_COMPLETE(
1294 	run,	CONFIG_SYS_MAXARGS,	1,	do_run,
1295 	"run commands in an environment variable",
1296 	"var [...]\n"
1297 	"    - run the commands in the environment variable(s) 'var'",
1298 	var_complete
1299 );
1300 #endif
1301 #endif /* CONFIG_SPL_BUILD */
1302