ddi_dma_curwin(9F) Kernel Functions for Drivers ddi_dma_curwin(9F)NAMEddi_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This interface is obsolete.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_set‐
up(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 cur‐
rent (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 TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Stability Level │Obsolete │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOattributes(5), ddi_dma_getwin(9F), ddi_dma_movwin(9F), ddi_dma_set‐
up(9F), ddi_dma_req(9S)
Writing Device Drivers
SunOS 5.10 16 Jan 2006 ddi_dma_curwin(9F)
