// dispmprt.h

PVOID DlAllocateCommonBuffer(
  IN PVOID              DeviceHandle,
  IN PVP_DMA_ADAPTER    DlpDmaAdapter,
  IN ULONG              DesiredLength,
  OUT PPHYSICAL_ADDRESS LogicalAddress,
  IN BOOLEAN            CacheEnabled,
  OUT PVOID             Reserved
);
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Windows Driver Kit DDI reference (nf-dispmprt-dlallocatecommonbuffer)

DlAllocateCommonBuffer function

Description

Allocates and maps a logically contiguous region of memory that is simultaneously accessible both from the processor and from a device.

Parameters

`DeviceHandle`

Handle to the device.

`DlpDmaAdapter`

Display library direct memory access adapter.

`DesiredLength`

Specifies the requested number of bytes of memory.

`LogicalAddress`

Pointer to a memory location that receives the logical address to be used by the adapter to access the allocated buffer.

`CacheEnabled`

Specifies whether the allocated memory can be cached.

`Reserved`

Is currently ignored by the video port driver.

Return value

This function returns PVOID.

DlAllocateCommonBuffer - NtDoc