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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Google Inc.
* Copyright (C) 2015 Intel Corporation.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#include <stdint.h>
#include <cpu/x86/msr.h>
#include <timer.h>
#include <soc/msr.h>
static inline uint32_t read_counter_msr(void)
{
/*
* Even though the MSR is 64-bit it is assumed that the hardware
* is polled frequently enough to only use the lower 32-bits.
*/
msr_t counter_msr;
counter_msr = rdmsr(MSR_COUNTER_24_MHZ);
return counter_msr.lo;
}
void timer_monotonic_get(struct mono_time *mt)
{
/* Always increases. Don't normalize to 0 between stages. */
mono_time_set_usecs(mt, read_counter_msr() / 24);
}
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