diff options
Diffstat (limited to 'src/soc/amd/stoneyridge/monotonic_timer.c')
-rw-r--r-- | src/soc/amd/stoneyridge/monotonic_timer.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/soc/amd/stoneyridge/monotonic_timer.c b/src/soc/amd/stoneyridge/monotonic_timer.c new file mode 100644 index 0000000000..170a640233 --- /dev/null +++ b/src/soc/amd/stoneyridge/monotonic_timer.c @@ -0,0 +1,32 @@ +/* + * 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> + +#define CU_PTSC_MSR 0xc0010280 +#define PTSC_FREQ_MHZ 100 + +void timer_monotonic_get(struct mono_time *mt) +{ + unsigned long long val; + msr_t msr; + + msr = rdmsr(CU_PTSC_MSR); + + val = ((unsigned long long)msr.hi << 32) | msr.lo; + + mono_time_set_usecs(mt, val / PTSC_FREQ_MHZ); +} |