GetCPUIDEx

The GetCPUIDEx function retrieves information about the CPU's family, model, and stepping, as well as extended features and cache information.

This function is a more advanced version of __cpuidex and provides a standardized way to access CPU information across different architectures.

Syntax

Parameters

eax[4]: An array of four 32-bit integers that receives the CPU identification information.
- eax[0]: Register EAX
- eax[1]: Register EBX
- eax[2]: Register ECX
- eax[3]: Register EDX
level: The CPUID level to query. This parameter determines the type of information returned. Common levels include:
- 0: Basic information (Vendor ID, Maximum Input Value)
- 1: Feature flags
- 2: Cache and TLB information
- 7: Extended features (with ECX bit 0 set)
leaf: The specific leaf within the CPUID level to query. This is used for extended CPUID functions. For basic levels (like 0 and 1), this is typically 0. For level 7, it can be used to query specific sub-leaves.

Return Value

This function does not return a value. The CPU information is returned in the eax array.

Remarks

The GetCPUIDEx function provides access to the CPUID instruction, which allows software to determine the processor's capabilities and features.

The exact information returned depends on the processor architecture and the values provided for level and leaf.

For detailed information on specific CPUID levels and leaves, refer to the processor vendor's documentation (e.g., Intel or AMD).

Syntax