This bit can be probed by the guest software to detect whether they are running inside a virtual machine. Descriptor 49h indicates a level-3 cache on GenuineIntel Family 0Fh Model 6 (Pentium 4 based Xeon) CPUs, and a level-2 cache on other CPUs. The MIPS32/64 architecture defines a mandatory Processor Identification ( PrId) and a series of daisy-chained Configuration Registers.

Virtual CPU's (hypervisors) set this bit to 1 and physical CPU's (all existing and future CPU's) set this bit to zero. On Intel CPUs that support PSN (Processor Serial Number), the PSN can be disabled by setting bit 21 of MSR 119h ( BBL_CR_CTL) to 1. For each of the four registers (EAX,EBX,ECX,EDX), if bit 31 is set, then the register should not be considered to contain valid descriptors (e.Intel Processor Identification and the CPUID Instruction (Application Note 485), last published version. Many of the bits in EDX (bits 0 through 9, 12 through 17, 23, and 24) are duplicates of EDX from the EAX=1 leaf - these bits are highlighted in light yellow.

Topology detection examples involving older (pre-2010) Intel processors that lack x2APIC (thus don't implement the EAX=Bh leaf) are given in a 2010 Intel presentation. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.

The 103 third parties who use cookies on this service do so for their purposes of displaying and measuring personalized ads, generating audience insights, and developing and improving products. Intel PPIN (Protected Processor Inventory Number): IA32_PPIN_CTL ( 04Eh) and IA32_PPIN ( 04Fh) MSRs. The level id space starts at 0 and is continuous, meaning that if a level id is invalid, all higher level ids will also be invalid. ACE v2 present: REP XCRYPTCTR instruction, as well as support for digest mode and misaligned data for ACE's REP XCRYPT* instructions.

Under the IA-32 operation mode of Itanium 2, the L3 cache size is always reported as 3 megabytes regardless of the actual size of the cache. Descriptor 80h indicates a 16 KByte shared instruction+data L1 cache with 4-way set-associativity and a cache-line size of 16 bytes. The cache details, including cache type, size, and associativity are communicated via the other registers on leaf 4.Plus, it comes complete with an ALPHA-MSR one-piece aluminum cantilever mount for effortless installation. CPUID must be issued with each parameter in sequence to get the entire 48-byte ASCII processor brand string.