ddi_dma_coff(9F) Kernel Functions for Drivers ddi_dma_coff(9F)NAMEddi_dma_coff - convert a DMA cookie to an offset within a DMA handle.
SYNOPSIS
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_coff(ddi_dma_handle_t handle, ddi_dma_cookie_t *cookiep,
off_t *offp);
INTERFACE LEVEL
Solaris SPARC DDI (Solaris SPARC DDI). This interface is obsolete.
PARAMETERS
handle The handle filled in by a call to ddi_dma_setup(9F).
cookiep A pointer to a DMA cookie (see ddi_dma_cookie(9S)) that con‐
tains the appropriate address, length and bus type to be
used in programming the DMA engine.
offp A pointer to an offset to be filled in.
DESCRIPTION
The ddi_dma_coff() function converts the values in DMA cookie pointed
to by cookiep to an offset (in bytes) from the beginning of the object
that the DMAhandle has mapped.
The ddi_dma_coff() function allows a driver to update a DMA cookie with
values it reads from its device's DMA engine after a transfer completes
and convert that value into an offset into the object that is mapped
for DMA.
RETURN VALUES
The ddi_dma_coff() function returns:
DDI_SUCCESS Successfully filled in offp.
DDI_FAILURE Failed to successfully fill in offp.
CONTEXT
The ddi_dma_coff() function can be called from user, interrupt, or ker‐
nel context.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Obsolete │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOddi_dma_setup(9F), ddi_dma_sync(9F), ddi_dma_cookie(9S)
Writing Device Drivers
SunOS 5.11 16 Jan 2006 ddi_dma_coff(9F)
