cpuid_edx

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

Syntax:

[result =] [[px]] cpuid_edx [(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.  The processor can be specified as px (where x is the processor ID), or an alias you have defined for a given processor ID.  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 EDX.

Discussion

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

Example 1

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

Command input:

cpuid_edx

Result:

BFEBFBFFH

Example 2

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

Command input:

cpuid_edx(10)

Result:

00000004H

Example 3

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

Command input:

define ord4 o4cpuidedx = cpuid_edx(10,5)

04cpuidedx

Result:

00000004H

Related Topics

cpuid_eax

cpuid_ebx

cpuid_ecx