| Duncan Laurie | c88c54c | 2014-04-30 16:36:13 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2014 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. |
| Duncan Laurie | c88c54c | 2014-04-30 16:36:13 -0700 | [diff] [blame] | 14 | */ |
| 15 | |
| 16 | #include <stdint.h> |
| 17 | #include <cpu/x86/msr.h> |
| 18 | #include <cpu/x86/tsc.h> |
| Julius Werner | 4ee4bd5 | 2014-10-20 13:46:39 -0700 | [diff] [blame] | 19 | #include <soc/cpu.h> |
| 20 | #include <soc/msr.h> |
| Duncan Laurie | c88c54c | 2014-04-30 16:36:13 -0700 | [diff] [blame] | 21 | |
| 22 | unsigned long tsc_freq_mhz(void) |
| 23 | { |
| 24 | msr_t platform_info; |
| 25 | |
| 26 | platform_info = rdmsr(MSR_PLATFORM_INFO); |
| 27 | return CPU_BCLK * ((platform_info.lo >> 8) & 0xff); |
| 28 | } |