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