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,
u_int ∗lenp);

INTERFACE LEVEL

Solaris SPARC DDI specific (Solaris SPARC DDI). 

ARGUMENTS

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

ddi_dma_curwin() 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

ddi_dma_curwin() returns:

DDI_SUCCESS
The current length and offset can be established.

DDI_FAILURE
Otherwise.

CONTEXT

ddi_dma_curwin() can be called from user or interrupt context. 

SEE ALSO

ddi_dma_movwin(9F), ddi_dma_setup(9F), ddi_dma_req(9S)

Writing Device Drivers

SunOS 5.5/SPARC  —  Last change: 7 Nov 1991