./_Man_Solaris_2.5_html/html9f/ddi_dma

Manual page for ddi_dma_curwin(9F)

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.