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/*
* This file is part of the coreboot project.
*
* Copyright 2013 Google Inc.
*
* 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.
*/
#include <cpu/x86/tsc.h>
#include <timestamp.h>
uint64_t timestamp_get(void)
{
return rdtscll();
}
int timestamp_tick_freq_mhz(void)
{
/* Chipsets that have a constant TSC provide this value correctly. */
if (CONFIG(TSC_CONSTANT_RATE))
return tsc_freq_mhz();
/* Filling tick_freq_mhz = 0 in timestamps-table will trigger
* userspace utility to try deduce it from the running system.
*/
return 0;
}
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