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Athlon64/Opteron) CPUs and is present in all later AMD CPUs - except the ones with the 'no_efer_lmsle' flag set. Intel Processor Identification and the CPUID Instruction (Application Note 485), last published version.
In other words, APIC ids 0 to 7 are reserved for the package, even though half of these values don't map to a logical processor. LKML, Re: (PATCH v3 00/21) Enable CET Virtualization, Jun 16, 2023 - provides additional discussion of how the CET-SSS prematurely-busy stack issue interacts with virtualization.Attempting to query an unsupported state-component in this manner results in EAX,EBX,ECX and EDX all being set to 0.
A program can use the CPUID to determine processor type and whether features such as MMX/ SSE are implemented. org page for CPUID, [68] but the Intel code sample for identifying processor topology [64] has the correct interpretation, and the current Intel Software Developer's Manual has a more clear language. Microsoft Visual C compiler has builtin function __cpuid() so the cpuid instruction may be embedded without using inline assembly, which is handy since the x86-64 version of MSVC does not allow inline assembly at all.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified.