| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2013 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; 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/tsc.h> |
| #include <timestamp.h> |
| |
| uint64_t timestamp_get(void) |
| { |
| return rdtscll(); |
| } |
| |
| int timestamp_tick_freq_mhz(void) |
| { |
| /* Chipsets that have a constant TSC provide this value correctly. */ |
| if (IS_ENABLED(CONFIG_TSC_CONSTANT_RATE)) |
| return tsc_freq_mhz(); |
| |
| /* Filling tick_freq_mhz = 0 in timestamps-table will trigger |
| * userspace utility to try deduce it from the running system. |
| */ |
| return 0; |
| } |