ddi_dma_devalign(9F) Kernel Functions for Drivers ddi_dma_devalign(9F)NAME
ddi_dma_devalign - find DMA mapping alignment and minimum transfer size
SYNOPSIS
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_devalign(ddi_dma_handle_t handle, uint_t *alignment, uint_t *minxfr);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI).
PARAMETERS
handle The DMA handle filled in by a successful call to ddi_dma_setup(9F).
alignment A pointer to an unsigned integer to be filled in with the minimum required alignment for DMA. The alignment is guaranteed
to be a power of two.
minxfr A pointer to an unsigned integer to be filled in with the minimum effective transfer size (see ddi_iomin(9F),
ddi_dma_lim_sparc(9S) and ddi_dma_lim_x86(9S)). This also is guaranteed to be a power of two.
DESCRIPTION
ddi_dma_devalign() determines after a successful DMA mapping (see ddi_dma_setup(9F)) the minimum required data alignment and minimum DMA
transfer size.
RETURN VALUES
ddi_dma_devalign() returns:
DDI_SUCCESS The alignment and minxfr values have been filled.
DDI_FAILURE The handle was illegal.
CONTEXT
ddi_dma_devalign() can be called from user or interrupt context.
SEE ALSO ddi_dma_setup(9F), ddi_iomin(9F), ddi_dma_lim_sparc(9S), ddi_dma_lim_x86(9S), ddi_dma_req(9S)
Writing Device Drivers
SunOS 5.10 1 Feb 1994 ddi_dma_devalign(9F)
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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This interface is obsolete.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)
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