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Document bus_dmamap_load_mbuf_sg()

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Scott Long 2005-01-15 20:50:52 +00:00
parent 2f69affe36
commit 824f4edf4f
1 changed files with 17 additions and 0 deletions
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17
share/man/man9/bus_dma.9
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@ -71,6 +71,7 @@
.Nm bus_dmamap_destroy ,
.Nm bus_dmamap_load ,
.Nm bus_dmamap_load_mbuf ,
.Nm bus_dmamap_load_mbuf_sg ,
.Nm bus_dmamap_load_uio ,
.Nm bus_dmamap_unload ,
.Nm bus_dmamap_sync ,
@ -100,6 +101,9 @@
"struct mbuf *mbuf" "bus_dmamap_callback2_t *callback" "void *callback_arg" \
"int flags"
.Ft int
.Fn bus_dmamap_load_mbuf_sg "bus_dma_tag_t dmat" "bus_dmamap_t map" \
"struct mbuf *mbuf" "bus_dma_segment_t *segs" "int *nsegs" "int flags"
.Ft int
.Fn bus_dmamap_load_uio "bus_dma_tag_t dmat" "bus_dmamap_t map" \
"struct uio *uio" "bus_dmamap_callback2_t *callback" "void *callback_arg" \
"int flags"
@ -556,6 +560,19 @@ Returns
.Er EINVAL
if the size of the mbuf chain exceeds the maximum limit of the
DMA tag.
.It Fn bus_dmamap_load_mbuf_sg "dmat" "map" "mbuf" "segs" "nsegs" "flags"
This is just like
.Fn bus_dmamap_load_mbuf
except that it returns immediately without calling a callback function. It is
provided for efficiency.
The scatter/gather segment array
.Va segs
is provided by the caller and filled in directly by the function.
The
.Va nsegs
argument is returned with the number of segments filled in.
Returns the same errors as
.Fn bus_dmamap_load_mbuf .
.It Fn bus_dmamap_load_uio "dmat" "map" "uio" "callback2" "callback_arg" "flags"
This is a variation of
.Fn bus_dmamap_load