Content-type: text/html Man page of ddi_dma_curwin

ddi_dma_curwin

Section: Kernel Functions for Drivers (9F)
Updated: 16 Jan 2006
Index Return to Main Contents
 

NAME

ddi_dma_curwin - report current DMA window offset and size  

SYNOPSIS

#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>

int ddi_dma_curwin(ddi_dma_handle_t handle, off_t *offp, uint_t *lenp);  

INTERFACE LEVEL

This interface is obsolete. ddi_dma_getwin(9F) should be used instead.  

PARAMETERS

handle The DMA handle filled in by a call to ddi_dma_setup(9F).

offp A pointer to a value which will be filled in with the current offset from the beginning of the object that is mapped for DMA.

lenp A pointer to a value which will be filled in with the size, in bytes, of the current window onto the object that is mapped for DMA.

 

DESCRIPTION

The ddi_dma_curwin() function reports the current DMA window offset and size. If a DMA mapping allows partial mapping, that is if the DDI_DMA_PARTIAL flag in the ddi_dma_req(9S) structure is set, its current (effective) DMA window offset and size can be obtained by a call to ddi_dma_curwin().  

RETURN VALUES

The ddi_dma_curwin() function returns:

DDI_SUCCESS The current length and offset can be established.

DDI_FAILURE Otherwise.

 

CONTEXT

The ddi_dma_curwin() function can be called from user, interrupt, or kernel context.  

ATTRIBUTES

See attributes(5) for a description of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
Stability LevelObsolete

 

SEE ALSO

attributes(5), ddi_dma_getwin(9F), ddi_dma_movwin(9F), ddi_dma_setup(9F), ddi_dma_req(9S)

Writing Device Drivers


 

Index

NAME
SYNOPSIS
INTERFACE LEVEL
PARAMETERS
DESCRIPTION
RETURN VALUES
CONTEXT
ATTRIBUTES
SEE ALSO

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Time: 02:39:47 GMT, October 02, 2010