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35cceb861c
Add a function to retrieve the elapsed time since boot. For that purpose use the base time in the timestamp table among with the current timestamp at call time of the function. So more precise the returned time is the elapsed time since the timestamp was initialized scaled in microseconds. This was chosen to get a reliable value even on platforms where the TSC might not be reset on software reset or warm start. Change-Id: Ib93ad89078645c0ebe256048cb48f9622c90451f Signed-off-by: Werner Zeh <werner.zeh@siemens.com> Reviewed-on: https://review.coreboot.org/21516 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
67 lines
2.3 KiB
C
67 lines
2.3 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 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) && (IS_ENABLED(CONFIG_EARLY_CBMEM_INIT) \
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|| !defined(__PRE_RAM__))
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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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/* Implemented by the architecture code */
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uint64_t timestamp_get(void);
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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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