RtlCmDecodeMemIoResource function (wdm.h)

Article
02/22/2024

The RtlCmDecodeMemIoResource routine provides the starting address and length of a CM_PARTIAL_RESOURCE_DESCRIPTOR structure that describes a range of memory or I/O port addresses.

Syntax

NTSYSAPI ULONGLONG RtlCmDecodeMemIoResource(
  [in]            PCM_PARTIAL_RESOURCE_DESCRIPTOR Descriptor,
  [out, optional] PULONGLONG                      Start
);

Parameters

[in] Descriptor

A pointer to the CM_PARTIAL_RESOURCE_DESCRIPTOR structure to provide the starting address and length for.

[out, optional] Start

A pointer to a variable that receives the starting address of the range of memory or I/O port addresses.

Return value

RtlCmDecodeMemIoResource returns the length of the address range, in bytes.

Remarks

The Type member of the CM_PARTIAL_RESOURCE_DESCRIPTOR structure must be CmResourceTypeMemory, CmResourceTypeMemoryLarge, or CmResourceTypePort.

Requirements

Requirement	Value
Minimum supported client	Available in Windows Vista and later versions of Windows.
Target Platform	Universal
Header	wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
Library	NtosKrnl.lib
DLL	NtosKrnl.exe
IRQL	Any level