| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2014 Google Inc. |
| * Copyright (C) 2015 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 <timer.h> |
| #include <soc/msr.h> |
| |
| static inline uint32_t read_counter_msr(void) |
| { |
| /* |
| * Even though the MSR is 64-bit it is assumed that the hardware |
| * is polled frequently enough to only use the lower 32-bits. |
| */ |
| msr_t counter_msr; |
| |
| counter_msr = rdmsr(MSR_COUNTER_24_MHZ); |
| |
| return counter_msr.lo; |
| } |
| |
| void timer_monotonic_get(struct mono_time *mt) |
| { |
| /* Always increases. Don't normalize to 0 between stages. */ |
| mono_time_set_usecs(mt, read_counter_msr() / 24); |
| } |