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Clarify that bus_dmamem_alloc boundary can be zero for no constraint.

This commit is contained in:
riastradh 2018-08-20 14:23:27 +00:00
parent b120dbba69
commit 66ff4d9640
1 changed files with 5 additions and 3 deletions
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8
share/man/man9/bus_dma.9
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@ -1,4 +1,4 @@
.\" $NetBSD: bus_dma.9,v 1.65 2017/11/12 21:14:33 riastradh Exp $
.\" $NetBSD: bus_dma.9,v 1.66 2018/08/20 14:23:27 riastradh Exp $
.\"
.\" Copyright (c) 1996, 1997, 1998, 2001, 2005, 2006 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -533,8 +533,7 @@ Behavior is not defined if invalid arguments are passed to
If given valid arguments,
.Fn bus_dmamap_sync
always succeeds.
.\" XXX: This does not work with all the arguments.
.It Fn bus_dmamem_alloc "tag" "size" "alignment" "boundary" "segs" "..."
.It Fn bus_dmamem_alloc "tag" "size" "alignment" "boundary" "segs" "nsegs" "rsegs" "flags"
Allocates memory that is "DMA safe" for the bus corresponding to the
given tag.
.Pp
@ -571,6 +570,9 @@ Each segment in the allocated memory must not cross this boundary
(relative to zero).
This value must be a power of two.
A boundary value less than the size of the allocation is invalid.
If no boundary condition needs to be observed, a
.Fa boundary
argument of 0 should be used.
.It Fa segs
An array of bus_dma_segment_t's, filled in as memory is allocated,
representing the opaque addresses of the memory chunks.