SVR5
dma_disable(D3)
dma_disable --
disable recognition of hardware requests on a DMA channel
Synopsis
#include <sys/dma.h>
#include <sys/ddi.h>
void dma_disable(int chan);
Description
dma_disable disables recognition of hardware requests on
the ISA, EISA, or MCA
DMA channel, chan.
The channel is then released and made available
for other use.
Arguments
chan-
DMA channel to be disabled.
Return values
None.
Usage
The caller must ensure that it is acting on behalf of
the channel owner, and that it makes sense to release the
channel.
The caller must ensure that the channel is in use
for hardware-initiated DMA transfers and
not software-initiated transfers.
Context and synchronization
All
contexts.
Hardware applicability
PC-AT compatible platforms
with ISA, EISA, or MCA
Version applicability
ddi:
1, 2, 3, 4, 5, 5mp, 6, 6mp, 7, 7mp, 7.1, 7.1mp, 8, 8mp
Future directions
This interface is expected to be replaced or modified in a future release.
References
dma_enable(D3),
dma_prog(D3),
dma_cb(D4)
``DMA'' in HDK Technical Reference
19 June 2005
© 2005 The SCO Group, Inc. All rights reserved.
OpenServer 6 and UnixWare (SVR5) HDK - June 2005