blob: 7ea571f6356c5c8382e5a426777b00b700bffff5 [file] [log] [blame]
/*
* 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;
}