diff options
| author | bde <bde@FreeBSD.org> | 1996-01-27 02:33:48 +0000 |
|---|---|---|
| committer | bde <bde@FreeBSD.org> | 1996-01-27 02:33:48 +0000 |
| commit | b367666afd7d12a7802e173170448bcd9f13d89b (patch) | |
| tree | 89c9bb6e9d083a3f547ce32b8b591b9a773993b4 /sys/dev/fdc | |
| parent | ae64a265a89555df45a3ad36f4cb2ef096386a30 (diff) | |
| download | FreeBSD-src-b367666afd7d12a7802e173170448bcd9f13d89b.zip FreeBSD-src-b367666afd7d12a7802e173170448bcd9f13d89b.tar.gz | |
Allocate DMA bounce buffers only when requested by drivers. Only the
fd and wt drivers need bounce buffers, so this normally saves 32K-1K
of kernel memory.
Keep track of which DMA channels are busy. isa_dmadone() must now be
called when DMA has finished or been aborted.
Panic for unallocated and too-small (required) bounce buffers.
fd.c:
There will be new warnings about isa_dmadone() not being called after
DMA has been aborted.
sound/dmabuf.c:
isa_dmadone() needs more parameters than are available, so temporarily
use a new interface isa_dmadone_nobounce() to avoid having to worry
about panics for fake parameters. Untested.
Diffstat (limited to 'sys/dev/fdc')
| -rw-r--r-- | sys/dev/fdc/fdc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/dev/fdc/fdc.c b/sys/dev/fdc/fdc.c index 4a16c7c..2470803 100644 --- a/sys/dev/fdc/fdc.c +++ b/sys/dev/fdc/fdc.c @@ -43,7 +43,7 @@ * SUCH DAMAGE. * * from: @(#)fd.c 7.4 (Berkeley) 5/25/91 - * $Id: fd.c,v 1.76 1995/12/10 13:38:29 phk Exp $ + * $Id: fd.c,v 1.77 1995/12/10 19:44:45 bde Exp $ * */ @@ -574,6 +574,7 @@ fdattach(struct isa_device *dev) fdc->fdcu = fdcu; fdc->flags |= FDC_ATTACHED; fdc->dmachan = dev->id_drq; + isa_dmainit(fdc->dmachan, 128 << 3 /* XXX max secsize */); fdc->state = DEVIDLE; /* reset controller, turn motor off, clear fdout mirror reg */ outb(fdc->baseport + FDOUT, ((fdc->fdout = 0))); |
