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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, 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 This interface is obsolete.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 mapping (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 ALSO

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

Writing Device Drivers

Index

NAME

SYNOPSIS

INTERFACE LEVEL

PARAMETERS

DESCRIPTION

RETURN VALUES

CONTEXT

ATTRIBUTES

SEE ALSO

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