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Ryan Houdek
5646428640
This returns the `XFEATURE_ENABLED_MASK` register which reports what features are enabled on the CPU. This behaves similarly to CPUID where it uses an index register in ecx. This is a prerequisite to enabling XSAVE/XRSTOR and AVX since applications will expect this to exist. xsetbv is a privileged instruction and doesn't need to be implemented.