PGET_DMA_ALIGNMENT - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// wdm.h
PGET_DMA_ALIGNMENT PgetDmaAlignment;
ULONG PgetDmaAlignment(
[in] PDMA_ADAPTER DmaAdapter
)
{...}
View the official Windows Driver Kit DDI referenceNo description available.
The GetDmaAlignment routine returns the alignment requirements of the DMA system.
DmaAdapter [in]A pointer to the DMA_ADAPTER structure returned by IoGetDmaAdapter that represents the bus-master adapter or DMA controller.
GetDmaAlignment returns the alignment requirements, in bytes, of the DMA system. The starting address and length of DMA buffers must be a multiple of this value.
GetDmaAlignment is not a system routine that can be called directly by name. This routine is callable only by pointer from the address returned in a DMA_OPERATIONS structure. Drivers obtain the address of this routine by calling IoGetDmaAdapter.
A driver can call this routine to determine alignment requirements for DMA buffers it allocates. The returned value should be used to set the AlignmentRequirement field in the device object. A driver may need to increase this value because of additional hardware device restrictions. For more information, see Initializing a Device Object.