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cpuid_eax

Execute the CPUID assembly instruction and return the value in EAX.

Syntax:

[result =] [[px]] cpuid_eax [(eax[,ecx])]

Where:

[px]

is the viewpoint override, including punctuation ( [ ] ), specifying that the viewpoint is temporarily set to processor x of the boundary scan chain. ย The processor can be specified as px (where x is the processor ID), or an alias you have defined for a given processor ID. ย ALL cannot be used as a viewpoint override.

eax

is the value to be stored in EAX before the CPUID instruction is executed. If no value is specified, 1 is used by default.

ecx

is the value to be stored in ECX before the CPUID instruction is executed. If no value is specified, 0 is used by default.

result

is an ord4 variable to receive the value of EAX.

Discussion

Execute the CPUID instruction with the specified values of EAX and ECX. ย The return value (EAX) can be assigned to a debug variable, or displayed on the command line.

Example 1

To run cpuid_eax on the viewpoint processor with EAX=1 and display the value obtained in EAX:

Command input:

cpuid_eax

Result:

00020652H

Example 2

To run cpuid_eax on the viewpoint processor with EAX=10 and display the value obtained in EAX:

Command input:

cpuid_eax(10)

Result:

00000001H

Example 3

To run cpuid_eax on the viewpoint processor with EAX=10 and ECX=5 and store the result obtained in EAX to a variable:

Command input:

define ord4 o4cpuideax = cpuid_eax(10,5)

04cpuideax

Result:

00000000

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