diff options
author | Patrick Rudolph <siro@das-labor.org> | 2017-06-06 10:44:29 +0200 |
---|---|---|
committer | Martin Roth <martinroth@google.com> | 2017-06-09 16:27:19 +0200 |
commit | b9959e279c40b6db50efa61d20838757080fa4dd (patch) | |
tree | 2076a6f8bbc9019c555a598d2a3bd5424e3462a0 /src/cpu/intel/model_206ax/tsc_freq.c | |
parent | 21e7424fc985f2f92ee7e9f505acd72c53035531 (diff) |
cpu/intel/model_206ax: Use tsc monotonic timer
Switch from lapic to tsc.
Allows timestamps to be used in coreboot, as there's a reference
clock available to calculate correct time units.
Clean Kconfig, remove duplicated lapic code and include tsc dir for
LGA1155 boards.
Tested on Lenovo T430.
Change-Id: I849ca2b3908116d9d22907039cd6e4464444b1d1
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/20044
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/cpu/intel/model_206ax/tsc_freq.c')
-rw-r--r-- | src/cpu/intel/model_206ax/tsc_freq.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/cpu/intel/model_206ax/tsc_freq.c b/src/cpu/intel/model_206ax/tsc_freq.c new file mode 100644 index 0000000000..545ca5f106 --- /dev/null +++ b/src/cpu/intel/model_206ax/tsc_freq.c @@ -0,0 +1,27 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 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 <stdint.h> +#include <cpu/x86/msr.h> +#include <cpu/x86/tsc.h> +#include "model_206ax.h" + +unsigned long tsc_freq_mhz(void) +{ + msr_t platform_info; + + platform_info = rdmsr(MSR_PLATFORM_INFO); + return SANDYBRIDGE_BCLK * ((platform_info.lo >> 8) & 0xff); +} |