A program can use the CPUID to determine processor type and whether features such as MMX/ SSE are implemented. The big Intel manuals tend to lag behind the Intel ISA document, available at the top of this page, which is updated even for processors not yet publicly available, and thus usually contains more CPUID bits. If existing roofing needs to be replaced or a roof is being covered for the first time a roofing kit contains everything required to complete the job. a b c d e f g h i Descriptors 10h, 15h, 1Ah, 88h, 89h, 8Ah, 90h, 96h, 9Bh are documented for the IA-32 operation mode of Itanium only.

Equipped with a high-performance 6x optical system crafted with low-dispersion glass, it delivers crystal-clear clarity. Sub-leaf 0 provides information about supported SGX leaf functions in EAX and maximum supported SGX enclave sizes in EDX; ECX is reserved. Descriptor 70h indicates a 32-entry shared instruction+data 4-way-set-associative TLB with a 4K page size.volume 4: IA-32 Instruction Set, may 2010, document number: 323208, table 2-5, page 4:81, see bits 20 and 30. BHI_DIS_S prevents predicted targets of indirect branches executed in ring0/1/2 from being selected based on branch history from branches executed in ring 3.

The (open source) cross-platform production code [69] from Wildfire Games also implements the correct interpretation of the Intel documentation. As an example, a dual-core Westmere processor capable of hyperthreading (thus having two cores and four threads in total) could have x2APIC ids 0, 1, 4 and 5 for its four logical processors. Descriptor 80h indicates a 16 KByte shared instruction+data L1 cache with 4-way set-associativity and a cache-line size of 16 bytes. EDX bit 19 is used for CPU brand identification on AuthenticAMD Family 6 processors only - the bit is, combined with processor signature and FSB speed, used to identify processors as either multiprocessor-capable or carrying the Sempron brand name.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.