Actions
Bug #13962
open
Support using CPUID instruction for TSC frequency when available
Start date:
Due date:
% Done:
0%
Estimated time:
Difficulty:
Medium
Tags:
Gerrit CR:
External Bug:
Description
Intel has introduced CPUID leaf 0x15 which returns the following (on supported platforms):
EAX = numerator of TSC frequency / core crystal clock frequency
EBX = denominator of TSC frequency / core crystal clock frequency (if != 0)
ECX = core crystal clock frequency (in Hz, as an unsigned int)
When the CPUID instruction indicates support for this leaf, and the resulting values are non-zero, this can be used to determine the TSC frequency.
No data to display
Actions