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Kernel Functions for Driversddi_dma_burstsizes(9F)

NAME

 ddi_dma_burstsizes - find out the allowed burst sizes for a DMA mapping

SYNOPSIS

  
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_burstsizes(ddi_dma_handle_t handle);

INTERFACE LEVEL

 

Solaris DDI specific (Solaris DDI).

PARAMETERS

 
handle
A DMA handle that was filled in by a successful call to ddi_dma_setup(9F).

DESCRIPTION

 

ddi_dma_burstsizes() returns the allowed burst sizes for a DMA mapping. This value is derived from the dlim_burstsizes member of the ddi_dma_lim_sparc(9S) structure, but it shows the allowable burstsizes after imposing on it the limitations of other device layers in addition to device's own limitations.

RETURN VALUES

 

ddi_dma_burstsizes() returns a binary encoded value of the allowable DMA burst sizes. See ddi_dma_lim_sparc(9S) for a discussion of DMA burst sizes.

CONTEXT

 

This function can be called from user or interrupt context.

SEE ALSO

 

ddi_dma_devalign(9F), ddi_dma_setup(9F), ddi_dma_lim_sparc(9S), ddi_dma_req(9S)

Writing Device Drivers


SunOS 5.9Go To TopLast Changed 1 Feb 1994
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