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| author | marius <marius@FreeBSD.org> | 2009-05-12 20:56:34 +0000 |
|---|---|---|
| committer | marius <marius@FreeBSD.org> | 2009-05-12 20:56:34 +0000 |
| commit | 373616f83a50e69c8627a8da758c975fb6f3f8dc (patch) | |
| tree | 5352e471f1c123232c4f92e420cb353fdc6034fd /share | |
| parent | bea63f2169976b2254c53843e9b89e787efeb6c0 (diff) | |
| download | FreeBSD-src-373616f83a50e69c8627a8da758c975fb6f3f8dc.zip FreeBSD-src-373616f83a50e69c8627a8da758c975fb6f3f8dc.tar.gz | |
Correct r190283 (partially reverting it) as on sparc64 BUS_DMA_NOCACHE
actually is only valid for bus_dmamap_load().
MFC after: 3 days
Diffstat (limited to 'share')
| -rw-r--r-- | share/man/man9/bus_dma.9 | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/share/man/man9/bus_dma.9 b/share/man/man9/bus_dma.9 index dc5ae4b..7886b14 100644 --- a/share/man/man9/bus_dma.9 +++ b/share/man/man9/bus_dma.9 @@ -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 all zeros. 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 |
