summaryrefslogtreecommitdiffstats
path: root/include/mtd_node.h
diff options
context:
space:
mode:
authorWolfgang Wegner <w.wegner@astro-kom.de>2010-04-23 17:22:55 +0200
committerMike Frysinger <vapier@gentoo.org>2010-06-30 23:47:08 -0400
commit7319bcaf8ba1cddba2e56a722144eafc98868f77 (patch)
tree8e34694943c898519b29c44d1df5ccc130a6c15b /include/mtd_node.h
parent39ddd10b046fb791f47281ffb2100be01909ad72 (diff)
add redundant environment for env_sf.c
This patch adds redundant environment for environment in SPI flash. I took env_flash.c as an example and slightly modified it. Apart from adapting things to SF, I also slightly changed the decision logic to use area 2 as a default in case the flags are wrong because not having a default path worried me. I did not add a section for CONFIG_ENV_IS_IN_SPI_FLASH in environment.h because I did not understand if this is desired and/or needed. So to use the feature, one has to set CONFIG_ENV_OFFSET_REDUND _and_ CONFIG_SYS_REDUNDAND_ENVIRONMENT. I checked it by powering off my board several times during flash erase or write, because I do not know if there are other stress test scenarios. Signed-off-by: Wolfgang Wegner <w.wegner@astro-kom.de> Acked-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'include/mtd_node.h')
0 files changed, 0 insertions, 0 deletions
generated by cgit (git 2.34.1) at 2026-03-31 08:06:57 +0000
ref='#n129'>129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2000-2010
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Andreas Heppel <aheppel@sysgo.de>
 */

#include <common.h>
#include <command.h>
#include <env.h>
#include <env_internal.h>
#include <sort.h>
#include <linux/stddef.h>
#include <search.h>
#include <errno.h>
#include <malloc.h>
#include <u-boot/crc.h>

DECLARE_GLOBAL_DATA_PTR;

/************************************************************************
 * Default settings to be used when no valid environment is found
 */
#include <env_default.h>

struct hsearch_data env_htab = {
	.change_ok = env_flags_validate,
};

/*
 * Read an environment variable as a boolean
 * Return -1 if variable does not exist (default to true)
 */
int env_get_yesno(const char *var)
{
	char *s = env_get(var);

	if (s == NULL)
		return -1;
	return (*s == '1' || *s == 'y' || *s == 'Y' || *s == 't' || *s == 'T') ?
		1 : 0;
}

/*
 * Look up the variable from the default environment
 */
char *env_get_default(const char *name)
{
	char *ret_val;
	unsigned long really_valid = gd->env_valid;
	unsigned long real_gd_flags = gd->flags;

	/* Pretend that the image is bad. */
	gd->flags &= ~GD_FLG_ENV_READY;
	gd->env_valid = ENV_INVALID;
	ret_val = env_get(name);
	gd->env_valid = really_valid;
	gd->flags = real_gd_flags;
	return ret_val;
}

void env_set_default(const char *s, int flags)
{
	if (sizeof(default_environment) > ENV_SIZE) {
		puts("*** Error - default environment is too large\n\n");
		return;
	}

	if (s) {
		if ((flags & H_INTERACTIVE) == 0) {
			printf("*** Warning - %s, "
				"using default environment\n\n", s);
		} else {
			puts(s);
		}
	} else {
		debug("Using default environment\n");
	}

	if (himport_r(&env_htab, (char *)default_environment,
			sizeof(default_environment), '\0', flags, 0,
			0, NULL) == 0)
		pr_err("## Error: Environment import failed: errno = %d\n",
		       errno);

	gd->flags |= GD_FLG_ENV_READY;
	gd->flags |= GD_FLG_ENV_DEFAULT;
}


/* [re]set individual variables to their value in the default environment */
int env_set_default_vars(int nvars, char * const vars[], int flags)
{
	/*
	 * Special use-case: import from default environment
	 * (and use \0 as a separator)
	 */
	flags |= H_NOCLEAR;
	return himport_r(&env_htab, (const char *)default_environment,
				sizeof(default_environment), '\0',
				flags, 0, nvars, vars);
}

/*
 * Check if CRC is valid and (if yes) import the environment.
 * Note that "buf" may or may not be aligned.
 */
int env_import(const char *buf, int check)
{
	env_t *ep = (env_t *)buf;

	if (check) {
		uint32_t crc;

		memcpy(&crc, &ep->crc, sizeof(crc));

		if (crc32(0, ep->data, ENV_SIZE) != crc) {
			env_set_default("bad CRC", 0);
			return -ENOMSG; /* needed for env_load() */
		}
	}

	if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', 0, 0,
			0, NULL)) {
		gd->flags |= GD_FLG_ENV_READY;
		return 0;
	}

	pr_err("Cannot import environment: errno = %d\n", errno);

	env_set_default("import failed", 0);

	return -EIO;
}

#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
static unsigned char env_flags;

int env_import_redund(const char *buf1, int buf1_read_fail,
		      const char *buf2, int buf2_read_fail)
{
	int crc1_ok, crc2_ok;
	env_t *ep, *tmp_env1, *tmp_env2;

	tmp_env1 = (env_t *)buf1;
	tmp_env2 = (env_t *)buf2;

	if (buf1_read_fail && buf2_read_fail) {
		puts("*** Error - No Valid Environment Area found\n");
	} else if (buf1_read_fail || buf2_read_fail) {
		puts("*** Warning - some problems detected ");
		puts("reading environment; recovered successfully\n");
	}

	if (buf1_read_fail && buf2_read_fail) {
		env_set_default("bad env area", 0);
		return -EIO;
	} else if (!buf1_read_fail && buf2_read_fail) {
		gd->env_valid = ENV_VALID;
		return env_import((char *)tmp_env1, 1);
	} else if (buf1_read_fail && !buf2_read_fail) {
		gd->env_valid = ENV_REDUND;
		return env_import((char *)tmp_env2, 1);
	}

	crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) ==
			tmp_env1->crc;
	crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) ==
			tmp_env2->crc;

	if (!crc1_ok && !crc2_ok) {
		env_set_default("bad CRC", 0);
		return -ENOMSG; /* needed for env_load() */
	} else if (crc1_ok && !crc2_ok) {
		gd->env_valid = ENV_VALID;
	} else if (!crc1_ok && crc2_ok) {
		gd->env_valid = ENV_REDUND;
	} else {
		/* both ok - check serial */
		if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
			gd->env_valid = ENV_REDUND;
		else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
			gd->env_valid = ENV_VALID;
		else if (tmp_env1->flags > tmp_env2->flags)
			gd->env_valid = ENV_VALID;
		else if (tmp_env2->flags > tmp_env1->flags)
			gd->env_valid = ENV_REDUND;
		else /* flags are equal - almost impossible */
			gd->env_valid = ENV_VALID;
	}

	if (gd->env_valid == ENV_VALID)
		ep = tmp_env1;
	else
		ep = tmp_env2;

	env_flags = ep->flags;
	return env_import((char *)ep, 0);
}
#endif /* CONFIG_SYS_REDUNDAND_ENVIRONMENT */

/* Export the environment and generate CRC for it. */
int env_export(env_t *env_out)
{
	char *res;
	ssize_t	len;

	res = (char *)env_out->data;
	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
	if (len < 0) {
		pr_err("Cannot export environment: errno = %d\n", errno);
		return 1;
	}

	env_out->crc = crc32(0, env_out->data, ENV_SIZE);

#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
	env_out->flags = ++env_flags; /* increase the serial */
#endif

	return 0;
}

void env_relocate(void)
{
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
	env_reloc();
	env_fix_drivers();
	env_htab.change_ok += gd->reloc_off;
#endif
	if (gd->env_valid == ENV_INVALID) {
#if defined(CONFIG_ENV_IS_NOWHERE) || defined(CONFIG_SPL_BUILD)
		/* Environment not changable */
		env_set_default(NULL, 0);
#else
		bootstage_error(BOOTSTAGE_ID_NET_CHECKSUM);
		env_set_default("bad CRC", 0);
#endif
	} else {
		env_load();
	}
}

#ifdef CONFIG_AUTO_COMPLETE
int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf,
		 bool dollar_comp)
{
	struct env_entry *match;
	int found, idx;

	if (dollar_comp) {
		/*
		 * When doing $ completion, the first character should
		 * obviously be a '$'.
		 */
		if (var[0] != '$')
			return 0;

		var++;

		/*
		 * The second one, if present, should be a '{', as some
		 * configuration of the u-boot shell expand ${var} but not
		 * $var.
		 */
		if (var[0] == '{')
			var++;
		else if (var[0] != '\0')
			return 0;
	}

	idx = 0;
	found = 0;
	cmdv[0] = NULL;


	while ((idx = hmatch_r(var, idx, &match, &env_htab))) {
		int vallen = strlen(match->key) + 1;

		if (found >= maxv - 2 ||
		    bufsz < vallen + (dollar_comp ? 3 : 0))
			break;

		cmdv[found++] = buf;

		/* Add the '${' prefix to each var when doing $ completion. */
		if (dollar_comp) {
			strcpy(buf, "${");
			buf += 2;
			bufsz -= 3;
		}

		memcpy(buf, match->key, vallen);
		buf += vallen;
		bufsz -= vallen;

		if (dollar_comp) {
			/*
			 * This one is a bit odd: vallen already contains the
			 * '\0' character but we need to add the '}' suffix,