AGP-Type Aperture-Space Segments
An AGP-type aperture-space segment is similar to a linear aperture-space segment; however, the display miniport driver does not expose DXGK_OPERATION_MAP_APERTURE_SEGMENT and DXGK_OPERATION_UNMAP_APERTURE_SEGMENT operation types of the DxgkDdiBuildPagingBuffer callback function through the AGP-type aperture-space segment. Instead, the video memory manager uses the GART driver to map and unmap system pages (that is, the video memory manager does not involve the display miniport driver).
The driver must set the Agp bit-field flag in the Flags member of the DXGK_SEGMENTDESCRIPTOR structure to specify an AGP-type aperture-space segment.
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