u-boot/env/common.c
Simon Glass 401d1c4f5d common: Drop asm/global_data.h from common header
Move this out of the common header and include it only where needed.  In
a number of cases this requires adding "struct udevice;" to avoid adding
another large header or in other cases replacing / adding missing header
files that had been pulled in, very indirectly.   Finally, we have a few
cases where we did not need to include <asm/global_data.h> at all, so
remove that include.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
2021-02-02 15:33:42 -05:00

347 lines
7.8 KiB
C

// 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>
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