ddi_dma_coff - convert a DMA cookie to an offset within a DMA handle.
#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);
Solaris SPARC DDI (Solaris SPARC DDI). This interface is obsolete.
The handle filled in by a call to ddi_dma_setup(9F).
A pointer to a DMA cookie (see ddi_dma_cookie(9S)) that contains the appropriate address, length and bus type to be used in programming the DMA engine.
A pointer to an offset to be filled in.
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.
The ddi_dma_coff() function returns:
Successfully filled in offp.
Failed to successfully fill in offp.
The ddi_dma_coff() function can be called from user, interrupt, or kernel context.
See attributes(7) for descriptions of the following attributes: