svn commit: r192026 - head/share/man/man9

[Marius Strobl]

Author: marius
Date: Tue May 12 20:56:34 2009
New Revision: 192026
URL: http://svn.freebsd.org/changeset/base/192026

Log:
  Correct r190283 (partially reverting it) as on sparc64 BUS_DMA_NOCACHE
  actually is only valid for bus_dmamap_load().
  
  MFC after:	3 days

Modified:
  head/share/man/man9/bus_dma.9

Modified: head/share/man/man9/bus_dma.9
==============================================================================
--- head/share/man/man9/bus_dma.9	Tue May 12 20:42:12 2009	(r192025)
+++ head/share/man/man9/bus_dma.9	Tue May 12 20:56:34 2009	(r192026)
@@ -60,7 +60,7 @@
 .\" $FreeBSD$
 .\" $NetBSD: bus_dma.9,v 1.25 2002/10/14 13:43:16 wiz Exp $
 .\"
-.Dd November 16, 2008
+.Dd May 12, 2009
 .Dt BUS_DMA 9
 .Os
 .Sh NAME
@@ -561,6 +561,13 @@ Are as follows:
 .It Dv BUS_DMA_NOWAIT
 The load should not be deferred in case of insufficient mapping resources,
 and instead should return immediately with an appropriate error.
+.It Dv BUS_DMA_NOCACHE
+The generated transactions to and from the virtual page are non-cacheable.
+For
+.Fn bus_dmamap_load ,
+the
+.Dv BUS_DMA_NOCACHE
+flag is currently implemented on sparc64.
 .El
 .El
 .Pp
@@ -780,11 +787,12 @@ Causes the allocated memory to be set to
 The allocated memory will not be cached in the processor caches.
 All memory accesses appear on the bus and are executed
 without reordering.
-On the amd64 and i386 architectures this flag results in the
-Strong Uncacheable PAT to be set for the allocated virtual address range.
-The
+For
+.Fn bus_dmamem_alloc ,
+the
 .Dv BUS_DMA_NOCACHE
-flag is currently implemented on amd64, i386 and sparc64.
+flag is currently implemented on amd64 and i386 where it results in the
+Strong Uncacheable PAT to be set for the allocated virtual address range.
 .El
 .It Fa mapp
 Pointer to a