NAME | SYNOPSIS | INTERFACE LEVEL | PARAMETERS | DESCRIPTION | RETURN VALUES | CONTEXT | SEE ALSO
#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).
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.
ddi_dma_coff() converts the values in DMA cookie pointed to by cookiep to an offset (in bytes) from the beginning of the object that the DMA handle has mapped.
ddi_dma_coff() 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.
ddi_dma_coff() returns:
Successfully filled in offp.
Failed to successfully fill in offp.
ddi_dma_coff() can be called from user or interrupt context.
NAME | SYNOPSIS | INTERFACE LEVEL | PARAMETERS | DESCRIPTION | RETURN VALUES | CONTEXT | SEE ALSO