DMA_TRANSFER_INFO - NtDoc
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headers
// wdm.h
typedef struct _DMA_TRANSFER_INFO {
ULONG Version;
union {
DMA_TRANSFER_INFO_V1 V1;
DMA_TRANSFER_INFO_V2 V2;
};
} DMA_TRANSFER_INFO, *PDMA_TRANSFER_INFO;
View the official Windows Driver Kit DDI referenceNo description available.
The DMA_TRANSFER_INFO structure is a container for a DMA_TRANSFER_INFO_XXX structure that describes the allocation requirements for a scatter/gather list.
VersionThe version number of the DMA_TRANSFER_INFO_XXX structure that follows this member. For a DMA_TRANSFER_INFO_V1 structure, set this member to DMA_TRANSFER_INFO_VERSION1 before calling the GetDmaTransferInfo routine.
V1The allocation requirements for a scatter/gather list. For more information, see DMA_TRANSFER_INFO_V1.
V2The allocation requirements for a scatter/gather list. For more information, see DMA_TRANSFER_INFO_V2.
A device driver calls the GetDmaTransferInfo routine to obtain a DMA_TRANSFER_INFO structure that describes the allocation requirements for the scatter/gather list to use in a DMA transfer.
The unnamed union in this structure contains a DMA_TRANSFER_INFO_XXX structure. The Version member indicates which version of the DMA_TRANSFER_INFO_XXX structure is contained in the union.