ExIsProcessorFeaturePresent function (wdm.h)

Article
18/04/2022

The ExIsProcessorFeaturePresent routine queries for the existence of a specified processor feature.

Syntax

C++

BOOLEAN ExIsProcessorFeaturePresent(
  [in] ULONG ProcessorFeature
);

Parameters

[in] ProcessorFeature

Specifies one of the following constant values:

PF_FLOATING_POINT_PRECISION_ERRATA

The processor has the Pentium floating-point divide bug.

PF_FLOATING_POINT_EMULATED

The processor does not have floating-point hardware.

PF_COMPARE_EXCHANGE_DOUBLE

The processor has an 8-byte, memory-locked compare and exchange (CMPXCHG8B) instruction.

PF_MMX_INSTRUCTIONS_AVAILABLE

The processor supports MMX instructions in hardware.

PF_XMMI_INSTRUCTIONS_AVAILABLE

The processor supports SSE instructions in hardware.

PF_3DNOW_INSTRUCTIONS_AVAILABLE

The processor supports AMD 3DNow instructions.

PF_RDTSC_INSTRUCTION_AVAILABLE

The processor supports a read-timestamp-counter (RDTSC) instruction.

PF_PAE_ENABLED

The processor implements Physical Address Extension (PAE) support.

PF_XMMI64_INSTRUCTIONS_AVAILABLE

The processor supports SSE2 instructions in hardware. This parameter value is supported only in Windows XP and later versions of Windows.

PF_SSE_DAZ_MODE_AVAILABLE

The processor supports the denormals-are-zero (DAZ) mode for SSE instructions. This parameter value is supported only in Windows Vista and later versions of Windows.

PF_NX_ENABLED

Data execution prevention is enabled. This parameter value is supported only in Windows Vista and later versions of Windows.

PF_SSE3_INSTRUCTIONS_AVAILABLE

The processor supports SSE3 instructions. This parameter value is supported only in Windows Vista and later versions of Windows.

PF_COMPARE_EXCHANGE128

The atomic compare and exchange 128-bit operation (CMPXCHG16B) is available. This parameter value is supported only in Windows Vista and later versions of Windows.

PF_COMPARE64_EXCHANGE128

The atomic compare 64-bit and exchange 128-bit operation (CMP8XCHG16) is available. This parameter value is supported only in Windows Vista and later versions of Windows.

PF_XSAVE_ENABLED

The processor supports the XSAVE and XRSTOR instructions. This parameter value is supported only in Windows 7 and later versions of Windows.

Return value

ExIsProcessorFeaturePresent returns TRUE if the specified processor feature is present; otherwise, it returns FALSE.

Requirements

Requirement	Value
Minimum supported client	Available starting with Windows 2000.
Target Platform	Universal
Header	wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
Library	NtosKrnl.lib
DLL	NtosKrnl.exe
IRQL	PASSIVE_LEVEL
DDI compliance rules	HwStorPortProhibitedDDIs(storport), IrqlExPassive(wdm), PowerIrpDDis(wdm)

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