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- // 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 <bootstage.h>
- #include <command.h>
- #include <env.h>
- #include <env_internal.h>
- #include <log.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");
- }
- flags |= H_DEFAULT;
- 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 | H_DEFAULT;
- 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, int flags)
- {
- 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', flags, 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_check_redund(const char *buf1, int buf1_read_fail,
- const char *buf2, int buf2_read_fail)
- {
- int crc1_ok, crc2_ok;
- env_t *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) {
- return -EIO;
- } else if (!buf1_read_fail && buf2_read_fail) {
- gd->env_valid = ENV_VALID;
- return -EINVAL;
- } else if (buf1_read_fail && !buf2_read_fail) {
- gd->env_valid = ENV_REDUND;
- return -ENOENT;
- }
- 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) {
- 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;
- }
- return 0;
- }
- int env_import_redund(const char *buf1, int buf1_read_fail,
- const char *buf2, int buf2_read_fail,
- int flags)
- {
- env_t *ep;
- int ret;
- ret = env_check_redund(buf1, buf1_read_fail, buf2, buf2_read_fail);
- if (ret == -EIO) {
- env_set_default("bad env area", 0);
- return -EIO;
- } else if (ret == -EINVAL) {
- return env_import((char *)buf1, 1, flags);
- } else if (ret == -ENOENT) {
- return env_import((char *)buf2, 1, flags);
- } else if (ret == -ENOMSG) {
- env_set_default("bad CRC", 0);
- return -ENOMSG;
- }
- if (gd->env_valid == ENV_VALID)
- ep = (env_t *)buf1;
- else
- ep = (env_t *)buf2;
- env_flags = ep->flags;
- return env_import((char *)ep, 0, flags);
- }
- #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, "${");
- buf += 2;
- bufsz -= 3;
- }
- memcpy(buf, match->key, vallen);
- buf += vallen;
- bufsz -= vallen;
- if (dollar_comp) {
- /*
- * This one is a bit odd: vallen already contains the
- * '\0' character but we need to add the '}' suffix,
- * hence the buf - 1 here. strcpy() will add the '\0'
- * character just after '}'. buf is then incremented
- * to account for the extra '}' we just added.
- */
- strcpy(buf - 1, "}");
- buf++;
- }
- }
- qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);
- if (idx)
- cmdv[found++] = dollar_comp ? "${...}" : "...";
- cmdv[found] = NULL;
- return found;
- }
- #endif
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