Content-type: text/html Man page of ddi_dma_coff

ddi_dma_coff

Section: Kernel Functions for Drivers (9F)
Updated: 16 Jan 2006
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NAME

ddi_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 This interface is obsolete.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 contains 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 kernel context.  

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityObsolete

 

SEE ALSO

ddi_dma_setup(9F), ddi_dma_sync(9F), ddi_dma_cookie(9S)

Writing Device Drivers


 

Index

NAME
SYNOPSIS
INTERFACE LEVEL
PARAMETERS
DESCRIPTION
RETURN VALUES
CONTEXT
ATTRIBUTES
SEE ALSO

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Time: 02:39:40 GMT, October 02, 2010