Query: ddi_dma_coff
OS: opensolaris
Section: 9f
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
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 LEVELSolaris SPARC DDI (Solaris SPARC DDI). This interface is obsolete.PARAMETERShandle The handle filled in by a call to ddi_dma_setup(9F).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 contains the appropriate address, length and bus type to be used in pro- gramming the DMA engine. offp A pointer to an offset to be filled in.DESCRIPTIONThe 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 com- pletes and convert that value into an offset into the object that is mapped for DMA.RETURN VALUESThe ddi_dma_coff() function returns: DDI_SUCCESS Successfully filled in offp. DDI_FAILURE Failed to successfully fill in offp.CONTEXTThe ddi_dma_coff() function can be called from user, interrupt, or kernel context.ATTRIBUTESSee 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)
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