diff options
Diffstat (limited to 'src/soc/intel/broadwell/tsc_freq.c')
-rw-r--r-- | src/soc/intel/broadwell/tsc_freq.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/soc/intel/broadwell/tsc_freq.c b/src/soc/intel/broadwell/tsc_freq.c new file mode 100644 index 0000000000..80dd989d2e --- /dev/null +++ b/src/soc/intel/broadwell/tsc_freq.c @@ -0,0 +1,32 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2014 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <stdint.h> +#include <cpu/x86/msr.h> +#include <cpu/x86/tsc.h> +#include <broadwell/cpu.h> +#include <broadwell/msr.h> + +unsigned long tsc_freq_mhz(void) +{ + msr_t platform_info; + + platform_info = rdmsr(MSR_PLATFORM_INFO); + return CPU_BCLK * ((platform_info.lo >> 8) & 0xff); +} |