ddi_dma_devalign(9F) Kernel Functions for Drivers ddi_dma_devalign(9F)NAMEddi_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, uint_t *alignment, uint_t
*minxfr);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). This interface is obsolete.
PARAMETERS
handle The DMAhandle 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
The ddi_dma_devalign() Function determines after a successful DMA map‐
ping (see ddi_dma_setup(9F)) the minimum required data alignment and
minimum DMA transfer size.
RETURN VALUES
The ddi_dma_devalign() function returns:
DDI_SUCCESS The alignment and minxfr values have been filled.
DDI_FAILURE The handle was illegal.
CONTEXT
The ddi_dma_devalign() function can be called from user, interrupt, or
kernel context.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Obsolete │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOddi_dma_setup(9F), ddi_iomin(9F), ddi_dma_lim_sparc(9S),
ddi_dma_lim_x86(9S), ddi_dma_req(9S)
Writing Device Drivers
SunOS 5.10 04 Apr 2006 ddi_dma_devalign(9F)
