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Everything about CPUID

Instruction for x86 microprocessors

In the x86 architecture, the CPUID instruction is a processor supplementary instruction allowing software to discover details of the processor. It was introduced by Intel in 1993 with the launch of the Pentium and late 486 processors. Wikipedia →

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  1. History
  2. Calling CPUID
  3. EAX=0: Highest Function Parameter and Manufacturer ID
  4. EAX=1: Processor Info and Feature Bits
  5. EAX=2: Cache and TLB Descriptor Information
  6. EAX=3: Processor Serial Number
  7. EAX=4 and EAX=8000'001Dh: Cache Hierarchy and Topology
  8. EAX=4 and EAX=Bh: Intel Thread/Core and Cache Topology
  9. EAX=5: MONITOR/MWAIT Features
  10. EAX=6: Thermal and Power Management
  11. EAX=7, ECX=0: Extended Features
  12. EAX=7, ECX=1: Extended Features

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