IOMMU_MAP_LOGICAL_RANGE_EX callback function (wdm.h)

Article
02/25/2022

Maps physical address space into the logical address space of an IOMMU_DMA_DOMAIN.

Syntax

IOMMU_MAP_LOGICAL_RANGE_EX IommuMapLogicalRangeEx;

NTSTATUS IommuMapLogicalRangeEx(
  [in]           PIOMMU_DMA_DOMAIN Domain,
  [in]           ULONG Permissions,
  [in]           PIOMMU_MAP_PHYSICAL_ADDRESS PhysicalAddressToMap,
  [in, optional] PIOMMU_DMA_LOGICAL_ADDRESS ExplicitLogicalAddress,
  [in, optional] PIOMMU_DMA_LOGICAL_ADDRESS MinLogicalAddress,
  [in, optional] PIOMMU_DMA_LOGICAL_ADDRESS MaxLogicalAddress,
  [out]          PIOMMU_DMA_LOGICAL_ADDRESS LogicalAddressOut
)
{...}

Parameters

[in] Domain

A pointer to the IOMMU_DMA_DOMAIN that the mapped logical address will belong to. The domain must be of type DomainTypeTranslate. For more information about domain types, see IOMMU_DMA_DOMAIN_TYPE.

[in] Permissions

A bit-field representing the permissions to be set for the range being mapped. See Remarks for the available permission bits.

[in] PhysicalAddressToMap

The IOMMU_MAP_PHYSICAL_ADDRESS that will be mapped to the domain.

[in, optional] ExplicitLogicalAddress

The domain logical address that the physical address should be mapped to. If the domain was not created with a registered logical allocator, then this field is required. If the domain was created with a registered logical allocator that does not support explicit logical address allocation, then this field must be NULL.

[in, optional] MinLogicalAddress

The minimum (inclusive) allowable logical address that the physical address should be mapped to. If the domain was not created with a registered logical allocator, then this field will be ignored.

[in, optional] MaxLogicalAddress

The maximum (inclusive) allowable logical address that the physical address should be mapped to. If the domain was not created with a registered logical allocator, then this field will be ignored.

[out] LogicalAddressOut

Returns the resulting logical address from the mapping.

Return value

STATUS_SUCCESS if the operation is successful. Possible error return values include the following status codes.

Return code	Description
STATUS_INVALID_PARAMETER_1	The domain provided is not of type DomainTypeTranslate.
STATUS_INVALID_PARAMETER_3	The IOMMU_MAP_PHYSICAL_ADDRESS provided does not represent physical memory that is page-aligned and has a size that is a multiple of PAGE_SIZE.
STATUS_INVALID_PARAMETER_4	The ExplicitLogicalAddress provided is not page-aligned.
STATUS_INVALID_PARAMETER_MIX	The min and max logical addresses provided could not be satisfied.
STATUS_IN_USE	The ExplicitLogicalAddress is already mapped or partially mapped.
STATUS_NOT_SUPPORTED	An ExplicitLogicalAddress was provided for a domain with a logical allocator that does not allow explicit logical address allocation. Or an ExplicitLogicalAddress was not provided for a domain with no logical allocator.

For more information, see NTSTATUS Values.

Remarks

To unmap the logical address created by IOMMU_MAP_LOGICAL_RANGE_EX, use IOMMU_UNMAP_LOGICAL_RANGE; there currently is no Ex equivalent for logical address range unmapping.

The permissions field is a bitfield that describes the access permissions for the pages to be mapped.

The bits are defined as follows:

Bit 0 = Read Access

Bit 1 = Write Access

Bits 31-2 = Reserved (0)

Requirements

Requirement	Value
Minimum supported server	Windows Server 2022
Header	wdm.h (include Wdm.h)

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