33 lines
869 B
C
33 lines
869 B
C
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/*
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* This file is part of the coreboot project.
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*
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* Copyright 2018 Google Inc.
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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; either 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 <cpu/x86/msr.h>
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#include <timer.h>
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#define CU_PTSC_MSR 0xc0010280
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#define PTSC_FREQ_MHZ 100
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void timer_monotonic_get(struct mono_time *mt)
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{
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unsigned long long val;
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msr_t msr;
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msr = rdmsr(CU_PTSC_MSR);
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val = ((unsigned long long)msr.hi << 32) | msr.lo;
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mono_time_set_usecs(mt, val / PTSC_FREQ_MHZ);
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}
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