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