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/* Copyright 2019 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "common.h"
#include "ec_commands.h"
#include "config.h"
#include "hooks.h"
#include "system.h"
#include "ish_persistent_data.h"
#define PERSISTENT_DATA_MAGIC 0x49534864 /* "ISHd" */
struct ish_persistent_data ish_persistent_data = {
.magic = PERSISTENT_DATA_MAGIC,
.reset_flags = EC_RESET_FLAG_POWER_ON,
.watchdog_counter = 0,
.panic_data = { 0 },
};
/*
* When AON task firmware is not available (perhaps in the early
* stages of bringing up a new board), we have no way to persist data
* across reset. Allocate a memory region for "persistent data" which
* will never persist, this way we can use ish_persistent_data in a
* consistent manner without having to worry if the AON task firmware
* is available.
*
* Otherwise (AON task firmware is available), the
* ish_persistent_data_aon symbol is exported by the linker script.
*/
#ifdef CONFIG_ISH_PM_AONTASK
extern struct ish_persistent_data ish_persistent_data_aon;
#else
static struct ish_persistent_data ish_persistent_data_aon;
#endif
void ish_persistent_data_init(void)
{
if (ish_persistent_data_aon.magic == PERSISTENT_DATA_MAGIC) {
/* Stored data is valid, load a copy */
memcpy(&ish_persistent_data, &ish_persistent_data_aon,
sizeof(struct ish_persistent_data));
/* Invalidate stored data, in case commit fails to happen */
ish_persistent_data_aon.magic = 0;
}
/* Update the system module's copy of the reset flags */
system_set_reset_flags(chip_read_reset_flags());
}
void ish_persistent_data_commit(void)
{
memcpy(&ish_persistent_data_aon, &ish_persistent_data,
sizeof(struct ish_persistent_data));
}
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