| /* |
| * 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; |
| } |