A.2.3.14 DMA-Related Functions

A NIC driver calls DMA-related functions of the NDIS interface library for DMA operations between the host and the network interface card. These functions support maximized portability so the driver can run on both x86 and RISC-based architectures. Table A.2.17 defines these functions.

Table A.2.17 DMA-Related Functions

Function

Definition

NdisAllocateDmaChannel

Sets up a DMA channel for future DMA operations.

NdisCompleteDmaTransfer

Indicates that a DMA transfer has completed and resets the host DMA controller for further transfers.

NdisFreeDmaChannel

Frees a DMA channel that NdisAllocateDmaChannel has allocated.

NdisReadDmaCounter

Retrieves the number of bytes remaining in the current DMA transfer.

NdisSetupDmaTransfer

Prepares the host DMA controller for a DMA transfer.

Function	Definition
NdisAllocateDmaChannel	Sets up a DMA channel for future DMA operations.
NdisCompleteDmaTransfer	Indicates that a DMA transfer has completed and resets the host DMA controller for further transfers.
NdisFreeDmaChannel	Frees a DMA channel that NdisAllocateDmaChannel has allocated.
NdisReadDmaCounter	Retrieves the number of bytes remaining in the current DMA transfer.
NdisSetupDmaTransfer	Prepares the host DMA controller for a DMA transfer.