Manual page for ddi_dma_devalign(9F)
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
Created by unroff & hp-tools.
© by Hans-Peter Bischof. All Rights Reserved (1997).
Last modified 21/April/97
