'\" te
.\" Copyright (c) 1994, Sun Microsystems, Inc.
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License").  You may not use this file except in compliance with the License.
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.  See the License for the specific language governing permissions and limitations under the License.
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.TH DDI_DMA_NUMWIN 9F "Sep 29, 1994"
.SH NAME
ddi_dma_numwin \- retrieve number of DMA windows
.SH SYNOPSIS
.nf
#include <sys/ddi.h>
#include <sys/sunddi.h>



\fBint\fR \fBddi_dma_numwin\fR(\fBddi_dma_handle_t\fR \fIhandle\fR, \fBuint_t *\fR\fInwinp\fR);
.fi

.SH PARAMETERS
.ne 2
.na
\fB\fIhandle\fR \fR
.ad
.RS 11n
The  \fBDMA\fR handle previously allocated by a call to
\fBddi_dma_alloc_handle\fR(9F).
.RE

.sp
.ne 2
.na
\fB\fInwinp\fR \fR
.ad
.RS 11n
Upon a successful return,  \fInwinp\fR will contain the number of  \fBDMA\fR
windows for this object.
.RE

.SH INTERFACE LEVEL
illumos DDI specific (illumos DDI).
.SH DESCRIPTION
\fBddi_dma_numwin()\fR returns the number of  \fBDMA\fR windows for a
\fBDMA\fR object if partial resource allocation was permitted.
.SH RETURN VALUES
\fBddi_dma_numwin()\fR returns:
.sp
.ne 2
.na
\fB\fBDDI_SUCCESS\fR \fR
.ad
.RS 16n
Successfully filled in the number of  \fBDMA\fR windows.
.RE

.sp
.ne 2
.na
\fB\fBDDI_FAILURE\fR \fR
.ad
.RS 16n
\fBDMA\fR windows are not activated.
.RE

.SH CONTEXT
\fBddi_dma_numwin()\fR can be called from user, kernel, or interrupt context.
.SH SEE ALSO
.BR ddi_dma_addr_bind_handle (9F),
.BR ddi_dma_alloc_handle (9F),
.BR ddi_dma_buf_bind_handle (9F),
.BR ddi_dma_unbind_handle (9F)
.sp
.LP
\fIWriting Device Drivers\fR