ddi_dma_curwin(9F) Kernel Functions for Drivers ddi_dma_curwin(9F)
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This interface is obsolete.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
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_cur-
win().
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.
ATTRIBUTES
See attributes(5) for a description of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Stability Level |Obsolete |
+-----------------------------+-----------------------------+
SEE ALSO
attributes(5), ddi_dma_getwin(9F), ddi_dma_movwin(9F), ddi_dma_setup(9F), ddi_dma_req(9S)
Writing Device Drivers
SunOS 5.10 27 Sep 2002 ddi_dma_curwin(9F)
