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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2011 The ChromiumOS Authors. All rights reserved.
* Copyright (C) 2017 Siemens AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __TIMESTAMP_H__
#define __TIMESTAMP_H__
#include <commonlib/timestamp_serialized.h>
#if IS_ENABLED(CONFIG_COLLECT_TIMESTAMPS) && (IS_ENABLED(CONFIG_EARLY_CBMEM_INIT) \
|| !defined(__PRE_RAM__))
/*
* timestamp_init() needs to be called once for each of these cases:
* 1. __PRE_RAM__ (bootblock, romstage, verstage, etc) and
* 2. !__PRE_RAM__ (ramstage)
* The latter is taken care of by the generic coreboot infrastructure so
* it's up to the chipset/arch to call timestamp_init() in *one* of
* the __PRE_RAM__ stages. If multiple calls are made timestamps will be lost.
*/
void timestamp_init(uint64_t base);
/*
* Add a new timestamp. Depending on cbmem is available or not, this timestamp
* will be stored to cbmem / timestamp cache.
*/
void timestamp_add(enum timestamp_id id, uint64_t ts_time);
/* Calls timestamp_add with current timestamp. */
void timestamp_add_now(enum timestamp_id id);
/* Apply a factor of N/M to all timestamps recorded so far. */
void timestamp_rescale_table(uint16_t N, uint16_t M);
/*
* Get the time since boot scaled in microseconds. Therefore use the base time
* of the timestamps to get the initial value which is subtracted from
* current timestamp at call time. This will provide a more reliable value even
* if the TSC is not reset on soft reset or warm start.
*/
uint32_t get_us_since_boot(void);
#else
#define timestamp_init(base)
#define timestamp_add(id, time)
#define timestamp_add_now(id)
#define timestamp_rescale_table(N, M)
#define get_us_since_boot() 0
#endif
/**
* Workaround for guard combination above.
* Looks like CONFIG_EARLY_CBMEM_INIT selects
* timestamp.c to be build.
*/
#if IS_ENABLED(CONFIG_COLLECT_TIMESTAMPS)
/* Implemented by the architecture code */
uint64_t timestamp_get(void);
#else
#define timestamp_get() 0
#endif
uint64_t get_initial_timestamp(void);
/* Returns timestamp tick frequency in MHz. */
int timestamp_tick_freq_mhz(void);
#endif
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