mirror of
https://github.com/AsahiLinux/u-boot
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9243224687
The current name is quite unwieldy. Change it to use an ofprop_ prefix and shorten it. Fix the return-value comment while we are here. Signed-off-by: Simon Glass <sjg@chromium.org>
551 lines
12 KiB
C
551 lines
12 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 <bootstage.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 <log.h>
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#include <sort.h>
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#include <asm/global_data.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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#include <dm/ofnode.h>
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#include <net.h>
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#include <watchdog.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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* This env_set() function is defined in cmd/nvedit.c, since it calls
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* _do_env_set(), whis is a static function in that file.
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*
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* int env_set(const char *varname, const char *varvalue);
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*/
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/**
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* Set an environment variable to an integer value
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*
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* @param varname Environment variable to set
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* @param value Value to set it to
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* Return: 0 if ok, 1 on error
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*/
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int env_set_ulong(const char *varname, ulong value)
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{
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/* TODO: this should be unsigned */
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char *str = simple_itoa(value);
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return env_set(varname, str);
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}
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/**
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* Set an environment variable to an value in hex
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*
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* @param varname Environment variable to set
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* @param value Value to set it to
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* Return: 0 if ok, 1 on error
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*/
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int env_set_hex(const char *varname, ulong value)
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{
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char str[17];
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sprintf(str, "%lx", value);
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return env_set(varname, str);
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}
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ulong env_get_hex(const char *varname, ulong default_val)
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{
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const char *s;
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ulong value;
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char *endp;
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s = env_get(varname);
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if (s)
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value = hextoul(s, &endp);
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if (!s || endp == s)
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return default_val;
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return value;
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}
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int eth_env_get_enetaddr(const char *name, uint8_t *enetaddr)
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{
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string_to_enetaddr(env_get(name), enetaddr);
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return is_valid_ethaddr(enetaddr);
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}
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int eth_env_set_enetaddr(const char *name, const uint8_t *enetaddr)
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{
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char buf[ARP_HLEN_ASCII + 1];
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if (eth_env_get_enetaddr(name, (uint8_t *)buf))
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return -EEXIST;
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sprintf(buf, "%pM", enetaddr);
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return env_set(name, buf);
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}
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/*
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* Look up variable from environment,
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* return address of storage for that variable,
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* or NULL if not found
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*/
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char *env_get(const char *name)
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{
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if (gd->flags & GD_FLG_ENV_READY) { /* after import into hashtable */
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struct env_entry e, *ep;
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schedule();
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e.key = name;
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e.data = NULL;
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hsearch_r(e, ENV_FIND, &ep, &env_htab, 0);
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return ep ? ep->data : NULL;
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}
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/* restricted capabilities before import */
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if (env_get_f(name, (char *)(gd->env_buf), sizeof(gd->env_buf)) >= 0)
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return (char *)(gd->env_buf);
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return NULL;
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}
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/*
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* Like env_get, but prints an error if envvar isn't defined in the
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* environment. It always returns what env_get does, so it can be used in
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* place of env_get without changing error handling otherwise.
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*/
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char *from_env(const char *envvar)
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{
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char *ret;
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ret = env_get(envvar);
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if (!ret)
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printf("missing environment variable: %s\n", envvar);
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return ret;
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}
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static int env_get_from_linear(const char *env, const char *name, char *buf,
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unsigned len)
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{
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const char *p, *end;
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size_t name_len;
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if (name == NULL || *name == '\0')
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return -1;
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name_len = strlen(name);
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for (p = env; *p != '\0'; p = end + 1) {
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const char *value;
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unsigned res;
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for (end = p; *end != '\0'; ++end)
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if (end - env >= CONFIG_ENV_SIZE)
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return -1;
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if (strncmp(name, p, name_len) || p[name_len] != '=')
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continue;
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value = &p[name_len + 1];
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res = end - value;
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memcpy(buf, value, min(len, res + 1));
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if (len <= res) {
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buf[len - 1] = '\0';
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printf("env_buf [%u bytes] too small for value of \"%s\"\n",
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len, name);
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}
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return res;
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}
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return -1;
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}
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/*
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* Look up variable from environment for restricted C runtime env.
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*/
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int env_get_f(const char *name, char *buf, unsigned len)
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{
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const char *env;
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if (gd->env_valid == ENV_INVALID)
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env = default_environment;
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else
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env = (const char *)gd->env_addr;
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return env_get_from_linear(env, name, buf, len);
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}
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/**
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* Decode the integer value of an environment variable and return it.
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*
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* @param name Name of environment variable
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* @param base Number base to use (normally 10, or 16 for hex)
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* @param default_val Default value to return if the variable is not
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* found
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* Return: the decoded value, or default_val if not found
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*/
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ulong env_get_ulong(const char *name, int base, ulong default_val)
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{
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/*
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* We can use env_get() here, even before relocation, since the
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* environment variable value is an integer and thus short.
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*/
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const char *str = env_get(name);
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return str ? simple_strtoul(str, NULL, base) : default_val;
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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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bool env_get_autostart(void)
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{
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return env_get_yesno("autostart") == 1;
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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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if (env_get_from_linear(default_environment, name,
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(char *)(gd->env_buf),
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sizeof(gd->env_buf)) >= 0)
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return (char *)(gd->env_buf);
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return NULL;
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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 (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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flags |= H_DEFAULT;
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if (himport_r(&env_htab, 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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return;
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}
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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 | H_DEFAULT;
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return himport_r(&env_htab, 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, int flags)
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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', flags, 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_check_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 = 0, crc2_ok = 0;
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env_t *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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return -EIO;
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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)
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crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) ==
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tmp_env1->crc;
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if (!buf2_read_fail)
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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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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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return 0;
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}
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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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int flags)
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{
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env_t *ep;
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int ret;
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ret = env_check_redund(buf1, buf1_read_fail, buf2, buf2_read_fail);
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if (ret == -EIO) {
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env_set_default("bad env area", 0);
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return -EIO;
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} else if (ret == -ENOMSG) {
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env_set_default("bad CRC", 0);
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return -ENOMSG;
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}
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if (gd->env_valid == ENV_VALID)
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ep = (env_t *)buf1;
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else
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ep = (env_t *)buf2;
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env_flags = ep->flags;
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return env_import((char *)ep, 0, flags);
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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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#ifdef CONFIG_ENV_IMPORT_FDT
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void env_import_fdt(void)
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{
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const char *path;
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struct ofprop prop;
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ofnode node;
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int res;
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path = env_get("env_fdt_path");
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if (!path || !path[0])
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return;
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node = ofnode_path(path);
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if (!ofnode_valid(node)) {
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printf("Warning: device tree node '%s' not found\n", path);
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return;
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}
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for (res = ofnode_first_property(node, &prop);
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!res;
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res = ofnode_next_property(&prop)) {
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const char *name, *val;
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val = ofprop_get_property(&prop, &name, NULL);
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env_set(name, val);
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}
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}
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#endif
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