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Name

ddi_dma_devalign - find DMA mapping alignment and minimum transfer size

Synopsis


#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>

int ddi_dma_devalign(ddi_dma_handle_t handle, u_int *alignment, u_int *minxfr);

Interface Level

Solaris DDI specific (Solaris DDI).

Arguments

handle
The DMA handle filled in by a successful call to ddi_dma_setup(9F) .
alignment
A pointer to an unsigned integer to be filled in with the minimum required alignment for DMA. The alignment is guaranteed to be a power of two.
minxfr
A pointer to an unsigned integer to be filled in with the minimum effective transfer size (see ddi_iomin(9F) , ddi_dma_lim_sparc(9S) and ddi_dma_lim_x86(9S) ). This also is guaranteed to be a power of two.

Description

ddi_dma_devalign() determines (after a successful DMA mapping (see ddi_dma_setup(9F) ) the minimum required data alignment and minimum DMA transfer size.

Return Values

ddi_dma_devalign() returns:

DDI_SUCCESS
The alignment and minxfr values have been filled.
DDI_FAILURE
The handle was illegal.

Context

ddi_dma_devalign() can be called from user or interrupt context.

See Also

ddi_dma_setup(9F) , ddi_iomin(9F) , ddi_dma_lim_sparc(9S) , ddi_dma_lim_x86(9S) , ddi_dma_req(9S)


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