/*
 * This file is part of the coreboot project.
 *
 * Copyright 2018 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; either 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/msr.h>
#include <timer.h>
#include <timestamp.h>

#define CU_PTSC_MSR	0xc0010280
#define PTSC_FREQ_MHZ	100

void timer_monotonic_get(struct mono_time *mt)
{
	mono_time_set_usecs(mt, timestamp_get());
}

uint64_t timestamp_get(void)
{
	unsigned long long val;
	msr_t msr;

	msr = rdmsr(CU_PTSC_MSR);

	val = ((unsigned long long)msr.hi << 32) | msr.lo;

	return val / PTSC_FREQ_MHZ;
}