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Kernel Functions for Driversddi_dma_numwin(9F)


NAME

 ddi_dma_numwin - retrieve number of DMA windows

SYNOPSIS

 
#include <sys/ddi.h> 
#include <sys/sunddi.h>
int ddi_dma_numwin(ddi_dma_handle_t handle, uint_t *nwinp);

PARAMETERS

 
handle
The DMA handle previously allocated by a call to ddi_dma_alloc_handle(9F).
nwinp
Upon a successful return, nwinp will contain the number of DMA windows for this object.

INTERFACE LEVEL

 

Solaris DDI specific (Solaris DDI).

DESCRIPTION

 

ddi_dma_numwin() returns the number of DMA windows for a DMA object if partial resource allocation was permitted.

RETURN VALUES

 

ddi_dma_numwin() returns:

DDI_SUCCESS
Successfully filled in the number of DMA windows.
DDI_FAILURE
DMA windows are not activated.

CONTEXT

 

ddi_dma_numwin() can be called from user, kernel, or interrupt context.

SEE ALSO

 

ddi_dma_addr_bind_handle(9F), ddi_dma_alloc_handle(9F), ddi_dma_buf_bind_handle(9F), ddi_dma_unbind_handle(9F)

Writing Device Drivers


SunOS 5.9Go To TopLast Changed 29 Sep 1994

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.