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![Simon Glass](/assets/img/avatar_default.png)
These don't need to be in common.h so move them out into a new header. Also add some missing comments. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@konsulko.com>
321 lines
7.2 KiB
C
321 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2000-2010
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Andreas Heppel <aheppel@sysgo.de>
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*/
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#include <common.h>
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#include <command.h>
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#include <env.h>
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#include <env_internal.h>
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#include <sort.h>
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#include <linux/stddef.h>
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#include <search.h>
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#include <errno.h>
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#include <malloc.h>
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#include <u-boot/crc.h>
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DECLARE_GLOBAL_DATA_PTR;
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/************************************************************************
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* Default settings to be used when no valid environment is found
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*/
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#include <env_default.h>
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struct hsearch_data env_htab = {
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.change_ok = env_flags_validate,
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};
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/*
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* Read an environment variable as a boolean
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* Return -1 if variable does not exist (default to true)
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*/
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int env_get_yesno(const char *var)
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{
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char *s = env_get(var);
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if (s == NULL)
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return -1;
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return (*s == '1' || *s == 'y' || *s == 'Y' || *s == 't' || *s == 'T') ?
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1 : 0;
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}
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/*
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* Look up the variable from the default environment
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*/
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char *env_get_default(const char *name)
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{
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char *ret_val;
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unsigned long really_valid = gd->env_valid;
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unsigned long real_gd_flags = gd->flags;
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/* Pretend that the image is bad. */
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gd->flags &= ~GD_FLG_ENV_READY;
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gd->env_valid = ENV_INVALID;
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ret_val = env_get(name);
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gd->env_valid = really_valid;
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gd->flags = real_gd_flags;
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return ret_val;
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}
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void env_set_default(const char *s, int flags)
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{
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if (sizeof(default_environment) > ENV_SIZE) {
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puts("*** Error - default environment is too large\n\n");
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return;
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}
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if (s) {
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if ((flags & H_INTERACTIVE) == 0) {
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printf("*** Warning - %s, "
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"using default environment\n\n", s);
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} else {
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puts(s);
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}
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} else {
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debug("Using default environment\n");
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}
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if (himport_r(&env_htab, (char *)default_environment,
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sizeof(default_environment), '\0', flags, 0,
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0, NULL) == 0)
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pr_err("## Error: Environment import failed: errno = %d\n",
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errno);
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gd->flags |= GD_FLG_ENV_READY;
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gd->flags |= GD_FLG_ENV_DEFAULT;
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}
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/* [re]set individual variables to their value in the default environment */
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int env_set_default_vars(int nvars, char * const vars[], int flags)
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{
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/*
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* Special use-case: import from default environment
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* (and use \0 as a separator)
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*/
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flags |= H_NOCLEAR;
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return himport_r(&env_htab, (const char *)default_environment,
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sizeof(default_environment), '\0',
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flags, 0, nvars, vars);
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}
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/*
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* Check if CRC is valid and (if yes) import the environment.
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* Note that "buf" may or may not be aligned.
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*/
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int env_import(const char *buf, int check)
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{
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env_t *ep = (env_t *)buf;
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if (check) {
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uint32_t crc;
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memcpy(&crc, &ep->crc, sizeof(crc));
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if (crc32(0, ep->data, ENV_SIZE) != crc) {
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env_set_default("bad CRC", 0);
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return -ENOMSG; /* needed for env_load() */
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}
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}
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if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', 0, 0,
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0, NULL)) {
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gd->flags |= GD_FLG_ENV_READY;
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return 0;
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}
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pr_err("Cannot import environment: errno = %d\n", errno);
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env_set_default("import failed", 0);
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return -EIO;
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}
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#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
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static unsigned char env_flags;
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int env_import_redund(const char *buf1, int buf1_read_fail,
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const char *buf2, int buf2_read_fail)
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{
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int crc1_ok, crc2_ok;
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env_t *ep, *tmp_env1, *tmp_env2;
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tmp_env1 = (env_t *)buf1;
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tmp_env2 = (env_t *)buf2;
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if (buf1_read_fail && buf2_read_fail) {
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puts("*** Error - No Valid Environment Area found\n");
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} else if (buf1_read_fail || buf2_read_fail) {
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puts("*** Warning - some problems detected ");
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puts("reading environment; recovered successfully\n");
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}
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if (buf1_read_fail && buf2_read_fail) {
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env_set_default("bad env area", 0);
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return -EIO;
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} else if (!buf1_read_fail && buf2_read_fail) {
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gd->env_valid = ENV_VALID;
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return env_import((char *)tmp_env1, 1);
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} else if (buf1_read_fail && !buf2_read_fail) {
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gd->env_valid = ENV_REDUND;
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return env_import((char *)tmp_env2, 1);
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}
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crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) ==
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tmp_env1->crc;
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crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) ==
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tmp_env2->crc;
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if (!crc1_ok && !crc2_ok) {
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env_set_default("bad CRC", 0);
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return -ENOMSG; /* needed for env_load() */
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} else if (crc1_ok && !crc2_ok) {
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gd->env_valid = ENV_VALID;
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} else if (!crc1_ok && crc2_ok) {
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gd->env_valid = ENV_REDUND;
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} else {
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/* both ok - check serial */
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if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
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gd->env_valid = ENV_REDUND;
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else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
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gd->env_valid = ENV_VALID;
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else if (tmp_env1->flags > tmp_env2->flags)
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gd->env_valid = ENV_VALID;
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else if (tmp_env2->flags > tmp_env1->flags)
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gd->env_valid = ENV_REDUND;
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else /* flags are equal - almost impossible */
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gd->env_valid = ENV_VALID;
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}
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if (gd->env_valid == ENV_VALID)
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ep = tmp_env1;
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else
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ep = tmp_env2;
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env_flags = ep->flags;
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return env_import((char *)ep, 0);
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}
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#endif /* CONFIG_SYS_REDUNDAND_ENVIRONMENT */
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/* Export the environment and generate CRC for it. */
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int env_export(env_t *env_out)
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{
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char *res;
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ssize_t len;
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res = (char *)env_out->data;
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len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
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if (len < 0) {
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pr_err("Cannot export environment: errno = %d\n", errno);
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return 1;
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}
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env_out->crc = crc32(0, env_out->data, ENV_SIZE);
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#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
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env_out->flags = ++env_flags; /* increase the serial */
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#endif
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return 0;
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}
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void env_relocate(void)
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{
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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env_reloc();
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env_fix_drivers();
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env_htab.change_ok += gd->reloc_off;
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#endif
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if (gd->env_valid == ENV_INVALID) {
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#if defined(CONFIG_ENV_IS_NOWHERE) || defined(CONFIG_SPL_BUILD)
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/* Environment not changable */
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env_set_default(NULL, 0);
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#else
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bootstage_error(BOOTSTAGE_ID_NET_CHECKSUM);
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env_set_default("bad CRC", 0);
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#endif
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} else {
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env_load();
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}
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}
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#ifdef CONFIG_AUTO_COMPLETE
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int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf,
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bool dollar_comp)
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{
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struct env_entry *match;
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int found, idx;
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if (dollar_comp) {
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/*
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* When doing $ completion, the first character should
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* obviously be a '$'.
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*/
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if (var[0] != '$')
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return 0;
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var++;
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/*
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* The second one, if present, should be a '{', as some
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* configuration of the u-boot shell expand ${var} but not
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* $var.
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*/
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if (var[0] == '{')
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var++;
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else if (var[0] != '\0')
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return 0;
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}
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idx = 0;
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found = 0;
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cmdv[0] = NULL;
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while ((idx = hmatch_r(var, idx, &match, &env_htab))) {
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int vallen = strlen(match->key) + 1;
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if (found >= maxv - 2 ||
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bufsz < vallen + (dollar_comp ? 3 : 0))
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break;
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cmdv[found++] = buf;
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/* Add the '${' prefix to each var when doing $ completion. */
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if (dollar_comp) {
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strcpy(buf, "${");
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buf += 2;
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bufsz -= 3;
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}
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memcpy(buf, match->key, vallen);
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buf += vallen;
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bufsz -= vallen;
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if (dollar_comp) {
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/*
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* This one is a bit odd: vallen already contains the
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* '\0' character but we need to add the '}' suffix,
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* hence the buf - 1 here. strcpy() will add the '\0'
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* character just after '}'. buf is then incremented
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* to account for the extra '}' we just added.
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*/
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strcpy(buf - 1, "}");
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buf++;
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}
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}
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qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);
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if (idx)
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cmdv[found++] = dollar_comp ? "${...}" : "...";
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cmdv[found] = NULL;
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return found;
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}
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#endif
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