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env/common.c
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/* * (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> * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <command.h> #include <environment.h> #include <linux/stddef.h> #include <search.h> #include <errno.h> #include <malloc.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 set_default_env(const char *s) { int flags = 0; if (sizeof(default_environment) > ENV_SIZE) { puts("*** Error - default environment is too large "); return; } if (s) { if (*s == '!') { printf("*** Warning - %s, " "using default environment ", s + 1); } else { flags = H_INTERACTIVE; puts(s); } } else { debug("Using default environment "); } if (himport_r(&env_htab, (char *)default_environment, sizeof(default_environment), '\0', flags, 0, 0, NULL) == 0) pr_err("Environment import failed: errno = %d ", 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 set_default_vars(int nvars, char * const vars[]) { /* * Special use-case: import from default environment * (and use \0 as a separator) */ return himport_r(&env_htab, (const char *)default_environment, sizeof(default_environment), '\0', H_NOCLEAR | H_INTERACTIVE, 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) { set_default_env("!bad CRC"); return -EIO; } } 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 ", errno); set_default_env("!import failed"); 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 "); } else if (buf1_read_fail || buf2_read_fail) { puts("*** Warning - some problems detected "); puts("reading environment; recovered successfully "); } if (buf1_read_fail && buf2_read_fail) { set_default_env("!bad env area"); 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) { set_default_env("!bad CRC"); return -EIO; } 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 ", 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_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 */ set_default_env(NULL); #else bootstage_error(BOOTSTAGE_ID_NET_CHECKSUM); set_default_env("!bad CRC"); #endif } else { env_load(); } } #if defined(CONFIG_AUTO_COMPLETE) && !defined(CONFIG_SPL_BUILD) int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf) { ENTRY *match; int found, idx; 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) break; cmdv[found++] = buf; memcpy(buf, match->key, vallen); buf += vallen; bufsz -= vallen; } qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar); if (idx) cmdv[found++] = "..."; cmdv[found] = NULL; return found; } #endif |