blob: 21045a7eb33306f5852fe594b5cacc5871ab59b5 [file] [log] [blame]
// 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 <asm/global_data.h>
#include <linux/stddef.h>
#include <search.h>
#include <errno.h>
#include <malloc.h>
#include <u-boot/crc.h>
#include <dm/ofnode.h>
#include <net.h>
#include <watchdog.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,
};
/*
* This env_set() function is defined in cmd/nvedit.c, since it calls
* _do_env_set(), whis is a static function in that file.
*
* int env_set(const char *varname, const char *varvalue);
*/
/**
* Set an environment variable to an integer value
*
* @param varname Environment variable to set
* @param value Value to set it to
* Return: 0 if ok, 1 on error
*/
int env_set_ulong(const char *varname, ulong value)
{
/* TODO: this should be unsigned */
char *str = simple_itoa(value);
return env_set(varname, str);
}
/**
* Set an environment variable to an value in hex
*
* @param varname Environment variable to set
* @param value Value to set it to
* Return: 0 if ok, 1 on error
*/
int env_set_hex(const char *varname, ulong value)
{
char str[17];
sprintf(str, "%lx", value);
return env_set(varname, str);
}
ulong env_get_hex(const char *varname, ulong default_val)
{
const char *s;
ulong value;
char *endp;
s = env_get(varname);
if (s)
value = hextoul(s, &endp);
if (!s || endp == s)
return default_val;
return value;
}
int eth_env_get_enetaddr(const char *name, uint8_t *enetaddr)
{
string_to_enetaddr(env_get(name), enetaddr);
return is_valid_ethaddr(enetaddr);
}
int eth_env_set_enetaddr(const char *name, const uint8_t *enetaddr)
{
char buf[ARP_HLEN_ASCII + 1];
if (eth_env_get_enetaddr(name, (uint8_t *)buf))
return -EEXIST;
sprintf(buf, "%pM", enetaddr);
return env_set(name, buf);
}
/*
* Look up variable from environment,
* return address of storage for that variable,
* or NULL if not found
*/
char *env_get(const char *name)
{
if (gd->flags & GD_FLG_ENV_READY) { /* after import into hashtable */
struct env_entry e, *ep;
schedule();
e.key = name;
e.data = NULL;
hsearch_r(e, ENV_FIND, &ep, &env_htab, 0);
return ep ? ep->data : NULL;
}
/* restricted capabilities before import */
if (env_get_f(name, (char *)(gd->env_buf), sizeof(gd->env_buf)) >= 0)
return (char *)(gd->env_buf);
return NULL;
}
/*
* Like env_get, but prints an error if envvar isn't defined in the
* environment. It always returns what env_get does, so it can be used in
* place of env_get without changing error handling otherwise.
*/
char *from_env(const char *envvar)
{
char *ret;
ret = env_get(envvar);
if (!ret)
printf("missing environment variable: %s\n", envvar);
return ret;
}
static int env_get_from_linear(const char *env, const char *name, char *buf,
unsigned len)
{
const char *p, *end;
size_t name_len;
if (name == NULL || *name == '\0')
return -1;
name_len = strlen(name);
for (p = env; *p != '\0'; p = end + 1) {
const char *value;
unsigned res;
for (end = p; *end != '\0'; ++end)
if (end - env >= CONFIG_ENV_SIZE)
return -1;
if (strncmp(name, p, name_len) || p[name_len] != '=')
continue;
value = &p[name_len + 1];
res = end - value;
memcpy(buf, value, min(len, res + 1));
if (len <= res) {
buf[len - 1] = '\0';
printf("env_buf [%u bytes] too small for value of \"%s\"\n",
len, name);
}
return res;
}
return -1;
}
/*
* Look up variable from environment for restricted C runtime env.
*/
int env_get_f(const char *name, char *buf, unsigned len)
{
const char *env;
if (gd->env_valid == ENV_INVALID)
env = default_environment;
else
env = (const char *)gd->env_addr;
return env_get_from_linear(env, name, buf, len);
}
/**
* Decode the integer value of an environment variable and return it.
*
* @param name Name of environment variable
* @param base Number base to use (normally 10, or 16 for hex)
* @param default_val Default value to return if the variable is not
* found
* Return: the decoded value, or default_val if not found
*/
ulong env_get_ulong(const char *name, int base, ulong default_val)
{
/*
* We can use env_get() here, even before relocation, since the
* environment variable value is an integer and thus short.
*/
const char *str = env_get(name);
return str ? simple_strtoul(str, NULL, base) : default_val;
}
/*
* 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;
}
bool env_get_autostart(void)
{
return env_get_yesno("autostart") == 1;
}
/*
* Look up the variable from the default environment
*/
char *env_get_default(const char *name)
{
if (env_get_from_linear(default_environment, name,
(char *)(gd->env_buf),
sizeof(gd->env_buf)) >= 0)
return (char *)(gd->env_buf);
return NULL;
}
void env_set_default(const char *s, int flags)
{
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, default_environment,
sizeof(default_environment), '\0', flags, 0,
0, NULL) == 0) {
pr_err("## Error: Environment import failed: errno = %d\n",
errno);
return;
}
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, 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 = 0, crc2_ok = 0;
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");
return -EIO;
} else if (buf1_read_fail || buf2_read_fail) {
puts("*** Warning - some problems detected ");
puts("reading environment; recovered successfully\n");
}
if (!buf1_read_fail)
crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) ==
tmp_env1->crc;
if (!buf2_read_fail)
crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) ==
tmp_env2->crc;
if (!crc1_ok && !crc2_ok) {
gd->env_valid = ENV_INVALID;
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 == -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 (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
#ifdef CONFIG_ENV_IMPORT_FDT
void env_import_fdt(void)
{
const char *path;
struct ofprop prop;
ofnode node;
int res;
path = env_get("env_fdt_path");
if (!path || !path[0])
return;
node = ofnode_path(path);
if (!ofnode_valid(node)) {
printf("Warning: device tree node '%s' not found\n", path);
return;
}
for (res = ofnode_first_property(node, &prop);
!res;
res = ofnode_next_property(&prop)) {
const char *name, *val;
val = ofprop_get_property(&prop, &name, NULL);
env_set(name, val);
}
}
#endif