ddi_dma_segtocookie(9F) Kernel Functions for Drivers ddi_dma_segtocookie(9F)
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This interface is obsolete.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
ddi_dma_segtocookie() 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
ddi_dma_segtocookie() returns:
DDI_SUCCESS Successfully filled in all values.
DDI_FAILURE Failed to successfully fill in all values.
CONTEXT
ddi_dma_segtocookie() can be called from user or interrupt 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 */
}
}
}
}
ATTRIBUTES
See attributes(5) for a description of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Stability Level |Obsolete |
+-----------------------------+-----------------------------+
SEE ALSO
attributes(5), ddi_dma_nextcookie(9F). ddi_dma_nextseg(9F), ddi_dma_nextwin(9F), ddi_dma_sync(9F), ddi_dma_cookie(9S)
Writing Device Drivers
SunOS 5.10 27 Sep 2002 ddi_dma_segtocookie(9F)
