37 lines
911 B
C
37 lines
911 B
C
|
/*
|
||
|
|
* This file is part of the coreboot project.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2013 Google Inc.
|
||
|
|
* Copyright (C) 2015-2016 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <cpu/x86/msr.h>
|
||
|
|
#include <cpu/x86/tsc.h>
|
||
|
|
|
||
|
|
static unsigned long bus_freq_khz(void)
|
||
|
|
{
|
||
|
|
/* cpu freq = 400 MHz */
|
||
|
|
return 400 * 1000;
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned long tsc_freq_mhz(void)
|
||
|
|
{
|
||
|
|
/* assume ratio=1 */
|
||
|
|
unsigned bclk_khz = bus_freq_khz();
|
||
|
|
|
||
|
|
if (!bclk_khz)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return (bclk_khz * 1) / 1000;
|
||
|
|
}
|