47f3b1f243
Add configuration option which prevents the environment hash table to be ever cleared and reloaded with different content. This is useful in case the first environment loaded into the hash table contains e.g. sensitive content which must not be dropped or reloaded. Signed-off-by: Marek Vasut <marex@denx.de> Reviewed-by: Tom Rini <trini@konsulko.com>
391 lines
8.0 KiB
C
391 lines
8.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <common.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 <linux/bitops.h>
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#include <linux/bug.h>
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DECLARE_GLOBAL_DATA_PTR;
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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void env_fix_drivers(void)
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{
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struct env_driver *drv;
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const int n_ents = ll_entry_count(struct env_driver, env_driver);
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struct env_driver *entry;
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drv = ll_entry_start(struct env_driver, env_driver);
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for (entry = drv; entry != drv + n_ents; entry++) {
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if (entry->name)
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entry->name += gd->reloc_off;
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if (entry->load)
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entry->load += gd->reloc_off;
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if (entry->save)
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entry->save += gd->reloc_off;
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if (entry->erase)
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entry->erase += gd->reloc_off;
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if (entry->init)
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entry->init += gd->reloc_off;
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}
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}
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#endif
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static struct env_driver *_env_driver_lookup(enum env_location loc)
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{
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struct env_driver *drv;
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const int n_ents = ll_entry_count(struct env_driver, env_driver);
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struct env_driver *entry;
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drv = ll_entry_start(struct env_driver, env_driver);
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for (entry = drv; entry != drv + n_ents; entry++) {
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if (loc == entry->location)
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return entry;
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}
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/* Not found */
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return NULL;
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}
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static enum env_location env_locations[] = {
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#ifdef CONFIG_ENV_IS_IN_EEPROM
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ENVL_EEPROM,
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#endif
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#ifdef CONFIG_ENV_IS_IN_EXT4
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ENVL_EXT4,
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#endif
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#ifdef CONFIG_ENV_IS_IN_FAT
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ENVL_FAT,
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#endif
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#ifdef CONFIG_ENV_IS_IN_FLASH
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ENVL_FLASH,
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#endif
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#ifdef CONFIG_ENV_IS_IN_MMC
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ENVL_MMC,
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#endif
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#ifdef CONFIG_ENV_IS_IN_NAND
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ENVL_NAND,
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#endif
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#ifdef CONFIG_ENV_IS_IN_NVRAM
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ENVL_NVRAM,
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#endif
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#ifdef CONFIG_ENV_IS_IN_REMOTE
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ENVL_REMOTE,
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#endif
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#ifdef CONFIG_ENV_IS_IN_SATA
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ENVL_ESATA,
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#endif
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#ifdef CONFIG_ENV_IS_IN_SPI_FLASH
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ENVL_SPI_FLASH,
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#endif
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#ifdef CONFIG_ENV_IS_IN_UBI
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ENVL_UBI,
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#endif
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#ifdef CONFIG_ENV_IS_NOWHERE
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ENVL_NOWHERE,
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#endif
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};
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static bool env_has_inited(enum env_location location)
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{
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return gd->env_has_init & BIT(location);
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}
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static void env_set_inited(enum env_location location)
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{
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/*
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* We're using a 32-bits bitmask stored in gd (env_has_init)
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* using the above enum value as the bit index. We need to
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* make sure that we're not overflowing it.
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*/
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BUILD_BUG_ON(ENVL_COUNT > BITS_PER_LONG);
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gd->env_has_init |= BIT(location);
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}
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/**
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* env_get_location() - Returns the best env location for a board
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* @op: operations performed on the environment
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* @prio: priority between the multiple environments, 0 being the
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* highest priority
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*
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* This will return the preferred environment for the given priority.
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* This is overridable by boards if they need to.
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*
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* All implementations are free to use the operation, the priority and
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* any other data relevant to their choice, but must take into account
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* the fact that the lowest prority (0) is the most important location
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* in the system. The following locations should be returned by order
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* of descending priorities, from the highest to the lowest priority.
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*
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* Returns:
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* an enum env_location value on success, a negative error code otherwise
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*/
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__weak enum env_location env_get_location(enum env_operation op, int prio)
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{
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if (prio >= ARRAY_SIZE(env_locations))
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return ENVL_UNKNOWN;
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return env_locations[prio];
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}
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/**
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* env_driver_lookup() - Finds the most suited environment location
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* @op: operations performed on the environment
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* @prio: priority between the multiple environments, 0 being the
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* highest priority
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*
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* This will try to find the available environment with the highest
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* priority in the system.
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*
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* Returns:
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* NULL on error, a pointer to a struct env_driver otherwise
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*/
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static struct env_driver *env_driver_lookup(enum env_operation op, int prio)
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{
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enum env_location loc = env_get_location(op, prio);
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struct env_driver *drv;
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if (loc == ENVL_UNKNOWN)
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return NULL;
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drv = _env_driver_lookup(loc);
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if (!drv) {
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debug("%s: No environment driver for location %d\n", __func__,
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loc);
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return NULL;
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}
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return drv;
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}
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__weak int env_get_char_spec(int index)
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{
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return *(uchar *)(gd->env_addr + index);
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}
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int env_get_char(int index)
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{
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if (gd->env_valid == ENV_INVALID)
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return default_environment[index];
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else
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return env_get_char_spec(index);
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}
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int env_load(void)
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{
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struct env_driver *drv;
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int best_prio = -1;
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int prio;
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for (prio = 0; (drv = env_driver_lookup(ENVOP_LOAD, prio)); prio++) {
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int ret;
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if (!env_has_inited(drv->location))
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continue;
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printf("Loading Environment from %s... ", drv->name);
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/*
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* In error case, the error message must be printed during
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* drv->load() in some underlying API, and it must be exactly
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* one message.
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*/
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ret = drv->load();
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if (!ret) {
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printf("OK\n");
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gd->env_load_prio = prio;
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#if !CONFIG_IS_ENABLED(ENV_APPEND)
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return 0;
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#endif
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} else if (ret == -ENOMSG) {
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/* Handle "bad CRC" case */
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if (best_prio == -1)
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best_prio = prio;
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} else {
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debug("Failed (%d)\n", ret);
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}
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}
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/*
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* In case of invalid environment, we set the 'default' env location
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* to the best choice, i.e.:
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* 1. Environment location with bad CRC, if such location was found
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* 2. Otherwise use the location with highest priority
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*
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* This way, next calls to env_save() will restore the environment
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* at the right place.
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*/
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if (best_prio >= 0)
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debug("Selecting environment with bad CRC\n");
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else
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best_prio = 0;
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gd->env_load_prio = best_prio;
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return -ENODEV;
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}
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int env_reload(void)
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{
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struct env_driver *drv;
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drv = env_driver_lookup(ENVOP_LOAD, gd->env_load_prio);
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if (drv) {
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int ret;
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printf("Loading Environment from %s... ", drv->name);
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if (!env_has_inited(drv->location)) {
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printf("not initialized\n");
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return -ENODEV;
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}
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ret = drv->load();
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if (ret)
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printf("Failed (%d)\n", ret);
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else
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printf("OK\n");
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if (!ret)
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return 0;
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}
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return -ENODEV;
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}
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int env_save(void)
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{
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struct env_driver *drv;
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drv = env_driver_lookup(ENVOP_SAVE, gd->env_load_prio);
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if (drv) {
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int ret;
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printf("Saving Environment to %s... ", drv->name);
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if (!drv->save) {
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printf("not possible\n");
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return -ENODEV;
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}
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if (!env_has_inited(drv->location)) {
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printf("not initialized\n");
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return -ENODEV;
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}
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ret = drv->save();
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if (ret)
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printf("Failed (%d)\n", ret);
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else
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printf("OK\n");
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if (!ret)
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return 0;
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}
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return -ENODEV;
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}
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int env_erase(void)
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{
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struct env_driver *drv;
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drv = env_driver_lookup(ENVOP_ERASE, gd->env_load_prio);
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if (drv) {
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int ret;
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if (!drv->erase)
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return -ENODEV;
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if (!env_has_inited(drv->location))
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return -ENODEV;
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printf("Erasing Environment on %s... ", drv->name);
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ret = drv->erase();
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if (ret)
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printf("Failed (%d)\n", ret);
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else
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printf("OK\n");
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if (!ret)
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return 0;
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}
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return -ENODEV;
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}
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int env_init(void)
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{
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struct env_driver *drv;
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int ret = -ENOENT;
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int prio;
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for (prio = 0; (drv = env_driver_lookup(ENVOP_INIT, prio)); prio++) {
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if (!drv->init || !(ret = drv->init()))
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env_set_inited(drv->location);
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debug("%s: Environment %s init done (ret=%d)\n", __func__,
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drv->name, ret);
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}
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if (!prio)
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return -ENODEV;
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if (ret == -ENOENT) {
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = ENV_VALID;
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return 0;
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}
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return ret;
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}
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int env_select(const char *name)
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{
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struct env_driver *drv;
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const int n_ents = ll_entry_count(struct env_driver, env_driver);
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struct env_driver *entry;
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int prio;
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bool found = false;
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printf("Select Environment on %s: ", name);
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/* search ENV driver by name */
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drv = ll_entry_start(struct env_driver, env_driver);
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for (entry = drv; entry != drv + n_ents; entry++) {
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if (!strcmp(entry->name, name)) {
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found = true;
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break;
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}
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}
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if (!found) {
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printf("driver not found\n");
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return -ENODEV;
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}
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/* search priority by driver */
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for (prio = 0; (drv = env_driver_lookup(ENVOP_INIT, prio)); prio++) {
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if (entry->location == env_get_location(ENVOP_LOAD, prio)) {
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/* when priority change, reset the ENV flags */
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if (gd->env_load_prio != prio) {
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gd->env_load_prio = prio;
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gd->env_valid = ENV_INVALID;
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gd->flags &= ~GD_FLG_ENV_DEFAULT;
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}
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printf("OK\n");
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return 0;
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}
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}
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printf("priority not found\n");
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return -ENODEV;
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}
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