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ddi_dma_segtocookie (9)

>> ddi_dma_segtocookie (9) ( Solaris man: Ядро )

NAME

ddi_dma_segtocookie - convert a DMA segment to a DMA address cookie

SYNOPSIS

#include <sys/ddi.h> 
#include <sys/sunddi.h>



int ddi_dma_segtocookie(ddi_dma_seg_t seg, off_t *offp, off_t *lenp,
    ddi_dma_cookie_t *cookiep);

INTERFACE LEVEL

This interface is obsolete. ddi_dma_nextcookie(9F) should be used instead.

PARAMETERS

seg

: A DMA segment.

offp

: A pointer to an off_t. Upon a successful return, it is filled in with the offset. This segment is addressing within the object.

lenp

: The byte length. This segment is addressing within the object.

cookiep

: A pointer to a DMA cookie (see ddi_dma_cookie(9S)).

DESCRIPTION

The ddi_dma_segtocookie() function takes a DMA segment and fills in the cookie pointed to by cookiep with the appropriate address, length, and bus type to be used to program the DMA engine. ddi_dma_segtocookie() also fills in *offp and *lenp, which specify the range within the object.

RETURN VALUES

The ddi_dma_segtocookie() function returns:

DDI_SUCCESS

: Successfully filled in all values.

DDI_FAILURE

: Failed to successfully fill in all values.

CONTEXT

The ddi_dma_segtocookie() function can be called from user, interrupt, or kernel context.

EXAMPLES

Example 1 ddi_dma_segtocookie() example

for (win = NULL; (retw = ddi_dma_nextwin(handle, win, &nwin)) !=
   DDI_DMA_DONE; win = nwin) {
        if (retw != DDI_SUCCESS) {
                /* do error handling */
        } else {
                for (seg = NULL; (rets = ddi_dma_nextseg(nwin, seg, &nseg)) !=
                    DDI_DMA_DONE; seg = nseg) {
                        if (rets != DDI_SUCCESS) {

                                /* do error handling */ 
                        } else {
                                ddi_dma_segtocookie(nseg, &off, &len, &cookie);

                                /* program DMA engine */
                        }
                }
        }
}