cmd_nvedit.c

嵌入式ARM的一些源代码

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * Support for persistent environment data
 */
#include <ppcboot.h>
#include <command.h>
#include <cmd_nvedit.h>
#ifdef CONFIG_4xx
#include <malloc.h>
#endif

/*
 * The environment storages is simply a list of '\0'-terminated
 * "name=value" strings, the end of the list marked by a double '\0'.
 * New entries are always addrd at the end. Deleting an entry shifts
 * the remaining entries to the front. Replacing an entry is a
 * combination of deleting the old and adding the new value.
 */

#ifdef CONFIG_NVRAM_ENV
uchar *environment = (uchar *)CFG_NVRAM_VAR_ADDR;
ulong env_size = CFG_NVRAM_ENV_SIZE;
#else

#if defined(CFG_FLASH_ENV_ADDR)
static uchar environment[CFG_FLASH_ENV_SIZE];
static ulong env_size = CFG_FLASH_ENV_SIZE;

/* need both ENV and flash */
#if ((CONFIG_COMMANDS & (CFG_CMD_ENV|CFG_CMD_FLASH)) == (CFG_CMD_ENV|CFG_CMD_FLASH))
static uchar *flash_addr = (uchar *)CFG_FLASH_ENV_ADDR;
#endif	/* ENV, FLASH */

/*
 * the contents of the rom_addr pointer will not change when the monitor
 * is relocated into RAM and so will contain the old address of the
 * environment[] array in flash, but the environment[] array itself *will*
 * be relocated. Hence, we can tell whether the monitor has been relocated
 * by comparing the value of rom_addr with environment.
 */
static uchar *rom_addr = environment;

#if defined(CONFIG_COGENT) && !defined(CONFIG_CMA302)
#define ISVALID(p)	0	/* can't get motherboard flash working yet */
#else
#define ISVALID(p)	(crc32(0, (char *)(p), env_size - sizeof (ulong)) == \
			    *(ulong *)((char *)(p) + env_size - sizeof (ulong)))
#endif
#define MAKEVALID(p, s)	(*(ulong *)((char *)(p) + (s) - sizeof (ulong)) = \
			    crc32(0, (char *)(p), (s) - sizeof (ulong)))

#else /* CFG_FLASH_ENV_ADDR */
extern uchar environment[];
extern ulong env_size;

/* need both ENV and flash */
#if ((CONFIG_COMMANDS & (CFG_CMD_ENV|CFG_CMD_FLASH)) == (CFG_CMD_ENV|CFG_CMD_FLASH))
static uchar *flash_addr = environment;
#endif	/* ENV, FLASH */
#endif	/* CFG_FLASH_ENV_ADDR */
#endif	/* CONFIG_NVRAM_ENV */

static uchar *envmatch (uchar *, uchar *);
#if defined(CFG_FLASH_ENV_ADDR)
static uchar *env_init(void);
#else
static void env_init(void);
#endif	/* CFG_FLASH_ENV_ADDR */

#define XMK_STR(x)	#x
#define MK_STR(x)	XMK_STR(x)

static uchar default_environment[] = {
#ifdef	CONFIG_BOOTARGS
	"bootargs="	CONFIG_BOOTARGS			"\0"
#endif
#ifdef	CONFIG_BOOTCOMMAND
	"bootcmd="	CONFIG_BOOTCOMMAND		"\0"
#endif
#if (CONFIG_BOOTDELAY >= 0)
	"bootdelay="	MK_STR(CONFIG_BOOTDELAY)	"\0"
#endif
#if (CONFIG_BAUDRATE >= 0)
	"baudrate="	MK_STR(CONFIG_BAUDRATE)		"\0"
#endif
#ifdef	CONFIG_ETHADDR
	"ethaddr="	MK_STR(CONFIG_ETHADDR)		"\0"
#endif
#ifdef	CONFIG_IPADDR
	"ipaddr="	MK_STR(CONFIG_IPADDR)		"\0"
#endif
#ifdef	CONFIG_SERVERIP
	"serverip="	MK_STR(CONFIG_SERVERIP)		"\0"
#endif
	"\0"
};

char *getenv (uchar *name)
{
	uchar *env, *nxt;

#if defined(CFG_FLASH_ENV_ADDR)
	uchar *environment = env_init();
#else
	env_init();
#endif	/* CFG_FLASH_ENV_ADDR */

	for (env=environment; *env; env=nxt+1) {
		char *val;

		for (nxt=env; *nxt; ++nxt)
			;
		val=envmatch(name, env);
		if (!val)
			continue;
		return (val);
	}

	return (NULL);
}

void do_printenv (cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
{
	uchar *env, *nxt;
	int i;

#if defined(CFG_FLASH_ENV_ADDR)
	uchar *environment = env_init();
#else
	env_init();
#endif	/* CFG_FLASH_ENV_ADDR */

	if (argc == 1) {		/* Print all env variables	*/
		uchar *start = environment;
		for (env=environment; *env; env=nxt+1) {
			for (nxt=env; *nxt; ++nxt)
				;
			puts (env);
			putc  ('\n');

			if (tstc()) {
				getc ();
				printf ("\n ** Abort\n");
				return;
			}
		}

		printf("\nEnvironment size: %d bytes\n", env-start);

		return;
	}

	for (i=1; i<argc; ++i) {	/* print single env variables	*/
		char *name = argv[i];
		char *val = NULL;

		for (env=environment; *env; env=nxt+1) {

			for (nxt=env; *nxt; ++nxt)
				;
			val=envmatch(name, env);
			if (val) {
				puts (name);
				putc ('=');
				puts (val);
				putc ('\n');
				break;
			}
		}
		if (!val)
			printf ("## Error: \"%s\" not defined\n", name);
	}
}

void _do_setenv (bd_t *bd, int flag, int argc, char *argv[])
{
	int   i, len;
	int   console = -1;
	uchar *env, *nxt;
	uchar *oldval = NULL;
	uchar *name;

#if defined(CFG_FLASH_ENV_ADDR)
	uchar *environment = env_init();
	ulong real_env_size = env_size;
	ulong env_size = real_env_size - sizeof (ulong);
#else
	env_init();
#endif	/* CFG_FLASH_ENV_ADDR */

	name = argv[1];

	/*
	 * search if variable with this name already exists
	 */
	for (env=environment; *env; env=nxt+1) {
		for (nxt=env; *nxt; ++nxt)
			;
		if ((oldval=envmatch(name, env)) != NULL)
			break;
	}

	/*
	 * Delete any existing definition
	 */
	if (oldval) {
#ifndef CONFIG_ENV_OVERWRITE
		/*
		 * Ethernet Address and serial# can be set only once
		 */
		if ((strcmp (name, "ethaddr") == 0) ||
		    (strcmp (name, "serial#") == 0) ) {
			printf ("Can't overwrite \"%s\"\n", name);
			return;
		}
#endif

		/* Check for console redirection */
		if (strcmp(name,"stdin") == 0) {
			console = stdin;
		} else if (strcmp(name,"stdout") == 0) {
			console = stdout;
		} else if (strcmp(name,"stderr") == 0) {
			console = stderr;
		}

		if (console != -1) {
			if (argc < 3)		/* Cannot delete it! */
				return;

			/* Try assigning specified device */
			if (console_assign (console, argv[2]) < 0)
				return;
		}

		if (*++nxt == '\0') {
			*env = '\0';
		} else {
			for (;;) {
				*env = *nxt++;
				if ((*env == '\0') && (*nxt == '\0'))
					break;
				++env;
			}
		}
		*++env = '\0';
	}

#if defined(CFG_FLASH_ENV_ADDR)
	MAKEVALID(environment, real_env_size);
#endif	/* CFG_FLASH_ENV_ADDR */

	/* Delete only ? */
	if (argc < 3)
		return;

	/*
	 * Append new definition at the end
	 */
	for (env=environment; *env || *(env+1); ++env)
		;
	if (env > environment)
		++env;
	/*
	 * Overflow when:
	 * "name" + "=" + "val" +"\0\0"  > env_size - (env-environment)
	 */
	len = strlen(name) + 2;
	/* add '=' for first arg, ' ' for all others */
	for (i=2; i<argc; ++i) {
		len += strlen(argv[i]) + 1;
	}
	if (len > (&environment[env_size]-env)) {
		printf ("## Error: environment overflow, \"%s\" deleted\n", name);
		return;
	}
	while ((*env = *name++) != '\0')
		env++;