// d3dkmddi.h

typedef enum _DXGK_PHYSICAL_MEMORY_TYPE {
  DXGK_PHYSICAL_MEMORY_TYPE_MDL,
  DXGK_PHYSICAL_MEMORY_TYPE_CONTIGUOUS_MEMORY,
  DXGK_PHYSICAL_MEMORY_TYPE_SECTION,
  DXGK_PHYSICAL_MEMORY_TYPE_IO_SPACE
} DXGK_PHYSICAL_MEMORY_TYPE;
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Windows Driver Kit DDI reference (ne-d3dkmddi-dxgk_physical_memory_type)

Description

DXGK_PHYSICAL_MEMORY_TYPE indicates the type of physical memory being created by the driver in a call to DxgkCbCreatePhysicalMemoryObject.

Constants

`DXGK_PHYSICAL_MEMORY_TYPE_MDL`

Allocate nonpageable memory in the form of an MDL. This is functionally equivalent to calling MmAllocatePagesForMdl.

`DXGK_PHYSICAL_MEMORY_TYPE_CONTIGUOUS_MEMORY`

Allocate contiguous nonpageable memory. This is functionally equivalent to calling MmAllocateContiguousMemory.

`DXGK_PHYSICAL_MEMORY_TYPE_SECTION`

Allocate memory that can be mapped into one or more processes. This represents memory that would normally be allocated from ZwCreateSection.

`DXGK_PHYSICAL_MEMORY_TYPE_IO_SPACE`

Wrap an existing IO-space range provided by the driver.

Remarks

DXGK_PHYSICAL_MEMORY_TYPE is passed as a member of the DXGKARGCB_CREATE_PHYSICAL_MEMORY_OBJECT arguments.

See IOMMU DMA remapping for more information.

DXGK_PHYSICAL_MEMORY_TYPE - NtDoc