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/*
* Copyright (c) 1996, 1998 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
/*
* DMA channel management.
*/
#include <oskit/dev/dev.h>
/*
* Bitmap of allocated/free DMA channels.
*/
static int dma_busy = 0x10;
oskit_error_t
osenv_isadma_alloc(int channel)
{
if (dma_busy & (1 << channel))
return (1);
dma_busy |= 1 << channel;
return (0);
}
void
osenv_isadma_free(int channel)
{
dma_busy &= ~(1 << channel);
}
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