diff options
Diffstat (limited to 'src/northbridge/intel/sandybridge/udelay.c')
| -rw-r--r-- | src/northbridge/intel/sandybridge/udelay.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/northbridge/intel/sandybridge/udelay.c b/src/northbridge/intel/sandybridge/udelay.c index b150253247ec..7c9838015aec 100644 --- a/src/northbridge/intel/sandybridge/udelay.c +++ b/src/northbridge/intel/sandybridge/udelay.c @@ -53,3 +53,23 @@ void udelay(u32 us) } while ((tsc.hi < tsc1.hi) || ((tsc.hi == tsc1.hi) && (tsc.lo < tsc1.lo))); } + +#if CONFIG_LAPIC_MONOTONIC_TIMER && !defined(__PRE_RAM__) +#include <timer.h> + +void timer_monotonic_get(struct mono_time *mt) +{ + tsc_t tsc; + msr_t msr; + u32 fsb = 100, divisor; + u32 d; /* ticks per us */ + + msr = rdmsr(0xce); + divisor = (msr.lo >> 8) & 0xff; + d = fsb * divisor; /* On Core/Core2 this is divided by 4 */ + + tsc = rdtsc(); + + mt->microseconds = (long)((((uint64_t)tsc.hi << 32) | tsc.lo) / d); +} +#endif |