When running on AMD calibrate TSC using timer#45
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Pull request overview
Adds a runtime TSC frequency calibration fallback for x86_64 platforms where CPUID does not expose the TSC frequency (notably AMD CPUs and some older Intel parts). When getTscFrequencyCpuid() returns 0, Tsc::initialize() now measures TSC ticks against CLOCK_MONOTONIC over a 50 ms window using clock_nanosleep.
Changes:
- Adds
getTscFrequencyCalibrated()helper usingclock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, ...)to measure cycles over 50 ms. - Wires the calibration as a fallback in
Tsc::initialize()when CPUID-based detection yields 0. - Adds includes for
<silk/util/platform.h>(forgetTimeNanoseconds) and<cerrno>(forEINTR).
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