GetCPUInfo method

Programmed by Héctor A. Medina

Syntax

Invoke GetCPUInfo, lpCPUInfo

Function

Executes the CPUID instruction (not available in all processors) and returns information about the CPU.

Parameters

lpCPUInfo

Address of a CPUINFO structure (Easy Code defined).

Return value

Eax returns TRUE if sucessful, or FALSE if not.

If successful, the CPUINFO structure will have been filled with various CPU information. This structure is defined as follows:

CPUINFO Struct
    Description   DB 32 Dup 0  ; CPU description ('GenuineIntel', 'AuthenticAMD', etc.)
    Stepping      DD 0         ; Stepping ID
    Family        DD 0         ; Family (3 = 386, 4 = 486, 5 = Pentium, 6 = Pentium Pro)
    Model         DD 0         ; Model
    CPUType       DD 0         ; Reserved
    ModelID       DD 0         ; See 'REMARKS'
    FeaturesID    DD 0         ; See 'REMARKS'
    ExFeaturesID  DD 0         ; See 'REMARKS'
EndS

REMARKS: The CPUID instruction sets the Eax, Ecx and Edx registers with various information about the CPU. Although some of the information in the Eax register is already detailed in the Stepping, Family, Model and CPUType members of the structure, the whole value is also stored in the ModelID member. On the other hand, the FeaturesID member stores the value set by CPUID in the Edx register, while the ExFeaturesID member stores the value set by CPUID in the Ecx register (remember that Ecx and Edx are saved by the GetCPUInfo method). These values refer to compability flags and have the following meaning:

FeaturesID:

ExFeaturesID: