IPortWaveRTStream::GetPhysicalPageAddress method (portcls.h)

Article
10/21/2021

The GetPhysicalPageAddress method returns the physical address for a page within a memory descriptor list (MDL).

Syntax

PHYSICAL_ADDRESS GetPhysicalPageAddress(
  [in] PMDL  MemoryDescriptorList,
  [in] ULONG Index
);

Parameters

[in] MemoryDescriptorList

Pointer to the MDL.

[in] Index

Index to the target page within the MDL.

Return value

The GetPhysicalPageAddress method returns the physical address for a page within an MDL.

Remarks

The miniport driver calls this method to determine the physical memory address for pages within an MDL that was previously allocated by calling either IPortWaveRTStream::AllocatePagesForMdl or IPortWaveRTStream::AllocateContiguousPagesForMdl.

The miniport typically calls this for each page in the MDL in order to program the physical address into the DMA. The Index parameter is used to select the desired page, and can range from zero to the count returned by GetPhysicalPagesCount.

Requirements

Requirement	Value
Minimum supported client	Available in Windows Vista and later Windows operating systems.
Target Platform	Universal
Header	portcls.h
IRQL	Passive level