src/cpu/intel/model_2065x/tsc_freq.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2013 Google, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include <stdint.h>
  21 #include <cpu/x86/msr.h>
  22 #include <cpu/x86/tsc.h>
  23 #include "model_2065x.h"
  24
  25 unsigned long tsc_freq_mhz(void)
  26 {
  27         msr_t platform_info;
  28
  29         platform_info = rdmsr(MSR_PLATFORM_INFO);
  30         return NEHALEM_BCLK * ((platform_info.lo >> 8) & 0xff);
  31 }