ddi_dma_devalign(9F) manual page
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ddi_dma_devalign - find DMA mapping alignment and minimum transfer
size
#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);
Solaris DDI specific (Solaris DDI).
- 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.
ddi_dma_devalign()
determines (after a successful DMA mapping (see ddi_dma_setup(9F)
) the
minimum required data alignment and minimum DMA
transfer size.
ddi_dma_devalign()
returns:
- DDI_SUCCESS
- The alignment and minxfr values have been filled.
- DDI_FAILURE
- The handle was illegal.
ddi_dma_devalign() can be called
from user or interrupt context.
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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