5/4/2023 0 Comments Cpu z idTherefore, before calling CPUID, the correct input value should be set in EAX and ECX.įollowing is a valid assembly code calling CPUID for leaf value 0: MOV EAX, 00h In assembly programming language, CPUID can be used directly as it will use the value stored in EAX and ECX. The opcode of CPUID is 0Fh, A2h (= A20Fh). To know for which input, what information is provided, you need to consult the CPUID Specification document for the Processor you are using. ECX: known as sub-leaf Optional input Needed only for specific functions.ĬPUID instructions provide 4 outputs stored in 4 different registers:.Input determine the information returned by the CPUID instruction. ![]()
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