68fdb785b2
Add the Kconfig value HAVE_MONOTONIC_TIMER and the routine to read the TSC for the monotonic timer. Simplify the routine to get the TSC frequency. TEST=Build and run on Galileo Gen2 Change-Id: I806fb864b01e39277bf2d6276254b0543930c2f6 Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com> Reviewed-on: https://review.coreboot.org/18002 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Martin Roth <martinroth@google.com>
34 lines
904 B
C
34 lines
904 B
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2013 Google Inc.
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* Copyright (C) 2015-2016 Intel Corporation.
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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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#include <stdint.h>
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#include <cpu/x86/msr.h>
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#include <cpu/x86/tsc.h>
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#include <timer.h>
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unsigned long tsc_freq_mhz(void)
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{
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/* CPU freq = 400 MHz */
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return 400;
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}
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void timer_monotonic_get(struct mono_time *mt)
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{
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uint64_t tsc_value;
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tsc_value = rdtscll();
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mt->microseconds = tsc_value / tsc_freq_mhz();
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}
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