Plus, it comes complete with an ALPHA-MSR one-piece aluminum cantilever mount for effortless installation. In the x86 architecture, the CPUID instruction (identified by a CPUID opcode) is a processor supplementary instruction (its name derived from CPU Identification) allowing software to discover details of the processor. a b c d Descriptor values 26h, 27h, 28h and 81h are not listed in Intel documentation and are not used in any known CPU, but have been reported to be recognized by the Windows NT kernel v5. However, some versions of the Windows Vista kernel are reported to be checking this bit [43] - if it is set, Vista will recognize it as a "processor channels" feature. EBX provides a bitmap of bits that can be set in the MISCSELECT field in the SECS (SGX Enclave Control Structure) - this field is used to control information written to the MISC region of the SSA (SGX Save State Area) when an AEX (SGX Asynchronous Enclave Exit) occurs.

If either version was written in plain assembly language, the programmer must manually save the results of EAX, EBX, ECX, and EDX elsewhere if they want to keep using the values.

On early AMD K5 ( AuthenticAMD Family 5 Model 0) processors only, EDX bit 9 used to indicate support for PGE instead. While the CPUID instruction is specific to the x86 architecture, other architectures (like ARM) often provide on-chip registers which can be read in prescribed ways to obtain the same sorts of information provided by the x86 CPUID instruction. Alternate ways of silicon identification might be present; for example, DSPs from Texas Instruments contain a memory-based register set for each functional unit that starts with identifiers determining the unit type and model, its ASIC design revision and features selected at the design phase, and continues with unit-specific control and data registers. As of 2013 [update] AMD does not use these leaves but has alternate ways of doing the core enumeration.

Beware that using that older detection method on 2010 and newer Intel processors may overestimate the number of cores and logical processors because the old detection method assumes there are no gaps in the APIC id space, and this assumption is violated by some newer processors (starting with the Core i3 5x0 series), but these newer processors also come with an x2APIC, so their topology can be correctly determined using the EAX=Bh leaf method. Former use: Number of logical processors per physical processor; two for the Pentium 4 processor with Hyper-Threading Technology.

FCMOV and FCOMI instructions only available if onboard x87 FPU also present (indicated by EDX bit 0). A simpler way to interpret this information is that the last bit (bit number 0) of the x2APIC id identifies the SMT/hyperthreading unit inside each core in our example. Invariant TSC - TSC ( Time Stamp Counter) rate is guaranteed to be invariant across all P-states, C-states and sop grant transitions. 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. The processor serial number was introduced on Intel Pentium III, but due to privacy concerns, this feature is no longer implemented on later models (the PSN feature bit is always cleared).

If the Family ID field is either 6 or 15, the model is equal to the sum of the Extended Model ID field shifted left by 4 bits and the Model field.

IPRED_DIS prevents instructions at an indirect branch target from speculatively executing until the branch target address is resolved. Sub-leaf 1 provides a bitmap of which bits can be set in the 128-bit ATTRIBUTES field of SECS in EDX:ECX:EBX:EAX (this applies to the SECS copy used as input to the ENCLS[ECREATE] leaf function).

In the Motorola 680x0 family — that never had a CPUID instruction of any kind — certain specific instructions required elevated privileges. The LMSLE (Long Mode Segment Limit Enable) feature does not have its own CPUID flag and is detected by checking CPU family and model. But if one requested an extended feature not present on this CPU, they would not notice and might get random, unexpected results. Intel PPIN (Protected Processor Inventory Number): IA32_PPIN_CTL ( 04Eh) and IA32_PPIN ( 04Fh) MSRs. The specific problem is: Many table column headers don't line up with the corresponding data column.ARM architectures have a CPUID coprocessor register which requires exception level EL1 or above to access. These two leaves are used for processor topology (thread, core, package) and cache hierarchy enumeration in Intel multi-core (and hyperthreaded) processors. Ok, so a the main board went out on an MSR X6 magtrack encoder and I was hoping to replace the main board with a microcotroller.