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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
276 lines
6.2 KiB
C
276 lines
6.2 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 <environment.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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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 set_default_env(const char *s)
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{
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int flags = 0;
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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 (*s == '!') {
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printf("*** Warning - %s, "
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"using default environment\n\n",
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s + 1);
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} else {
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flags = H_INTERACTIVE;
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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("Environment import failed: errno = %d\n", 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 set_default_vars(int nvars, char * const vars[])
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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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return himport_r(&env_htab, (const char *)default_environment,
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sizeof(default_environment), '\0',
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H_NOCLEAR | H_INTERACTIVE, 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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set_default_env("!bad CRC");
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return -EIO;
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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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set_default_env("!import failed");
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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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set_default_env("!bad env area");
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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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set_default_env("!bad CRC");
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return -EIO;
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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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set_default_env(NULL);
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#else
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bootstage_error(BOOTSTAGE_ID_NET_CHECKSUM);
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set_default_env("!bad CRC");
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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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#if defined(CONFIG_AUTO_COMPLETE) && !defined(CONFIG_SPL_BUILD)
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int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf)
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{
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ENTRY *match;
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int found, idx;
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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 || bufsz < vallen)
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break;
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cmdv[found++] = buf;
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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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}
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qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);
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if (idx)
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cmdv[found++] = "...";
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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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