// wdm.h

typedef struct _IOMMU_DMA_LOGICAL_ADDRESS_TOKEN_MAPPED_SEGMENT {
  PIOMMU_DMA_LOGICAL_ADDRESS_TOKEN OwningToken;
  SIZE_T                           Offset;
  SIZE_T                           Size;
} IOMMU_DMA_LOGICAL_ADDRESS_TOKEN_MAPPED_SEGMENT, *PIOMMU_DMA_LOGICAL_ADDRESS_TOKEN_MAPPED_SEGMENT;
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Windows Driver Kit DDI reference (ns-wdm-iommu_dma_logical_address_token_mapped_segment)

Description

The IOMMU_DMA_LOGICAL_ADDRESS_TOKEN_MAPPED_SEGMENT represents a mapped portion of an IOMMU_DMA_LOGICAL_ADDRESS_TOKEN.

Members

`OwningToken`

Provides a pointer to the logical address token that this mapped segment belongs to.

`Offset`

The offset, in bytes, into the logical address token of the mapped region.

`Size`

The size, in bytes, of the mapped region within the logical address token.

Remarks

A IOMMU_DMA_LOGICAL_ADDRESS_TOKEN_MAPPED_SEGMENT is initialized when calling IOMMU_MAP_RESERVED_LOGICAL_RANGE on an IOMMU_DMA_LOGICAL_ADDRESS_TOKEN. It is invalidated when calling IOMMU_UNMAP_RESERVED_LOGICAL_RANGE.

A segment must represent a 4KB page aligned range within an IOMMU_DMA_LOGICAL_ADDRESS_TOKEN.

It is possible to map multiple segments within an IOMMU_DMA_LOGICAL_ADDRESS_TOKEN as long as the segments are not overlapping each other.

IOMMU_DMA_LOGICAL_ADDRESS_TOKEN_MAPPED_SEGMENT - NtDoc