Current File : //usr/share/man/man9f/ddi_dma_devalign.9f

'\" te
.\" Copyright (c) 2006, Sun Microsystems, Inc.
.TH ddi_dma_devalign 9F "04 Apr 2006" "SunOS 5.11" "Kernel Functions for Drivers"
.SH NAME
ddi_dma_devalign \- find DMA mapping alignment and minimum transfer size
.SH SYNOPSIS
.LP
.nf
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>

\fBint\fR \fBddi_dma_devalign\fR(\fBddi_dma_handle_t\fR \fIhandle\fR, \fBuint_t *\fR\fIalignment\fR, 
     \fBuint_t *\fR\fIminxfr\fR);
.fi

.SH INTERFACE LEVEL
.sp
.LP
Solaris DDI specific (Solaris DDI). This interface is obsolete.
.SH PARAMETERS
.sp
.ne 2
.mk
.na
\fB\fIhandle\fR\fR
.ad
.RS 13n
.rt  
The DMA\fBhandle\fR filled in by a successful call to \fBddi_dma_setup\fR(9F).
.RE

.sp
.ne 2
.mk
.na
\fB\fIalignment\fR\fR
.ad
.RS 13n
.rt  
A pointer to an unsigned integer to be filled in with the minimum required alignment for \fBDMA\fR. The alignment is guaranteed to be a power of two.
.RE

.sp
.ne 2
.mk
.na
\fB\fIminxfr\fR\fR
.ad
.RS 13n
.rt  
A pointer to an unsigned integer to be filled in with the minimum effective transfer size (see \fBddi_iomin\fR(9F), \fBddi_dma_lim_sparc\fR(9S) and \fBddi_dma_lim_x86\fR(9S)). This also is guaranteed to be a power of two.
.RE

.SH DESCRIPTION
.sp
.LP
The \fBddi_dma_devalign()\fR Function determines after a successful \fBDMA\fR mapping (see \fBddi_dma_setup\fR(9F)) the minimum required data alignment and minimum \fBDMA\fR transfer size.
.SH RETURN VALUES
.sp
.LP
The \fBddi_dma_devalign()\fR function returns:
.sp
.ne 2
.mk
.na
\fB\fBDDI_SUCCESS\fR\fR
.ad
.RS 15n
.rt  
The \fIalignment\fR and \fIminxfr\fR values have been filled.
.RE

.sp
.ne 2
.mk
.na
\fB\fBDDI_FAILURE\fR\fR
.ad
.RS 15n
.rt  
The handle was illegal.
.RE

.SH CONTEXT
.sp
.LP
The \fBddi_dma_devalign()\fR function can be called from user, interrupt, or kernel context.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityObsolete
.TE

.SH SEE ALSO
.sp
.LP
\fBddi_dma_setup\fR(9F), \fBddi_iomin\fR(9F), \fBddi_dma_lim_sparc\fR(9S), \fBddi_dma_lim_x86\fR(9S), \fBddi_dma_req\fR(9S)
.sp
.LP
\fIWriting Device Drivers for Oracle Solaris 11.2\fR