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/*
* Copyright (C) 2002-2004 The DOSBox Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: dma.h,v 1.12 2004/08/04 09:12:50 qbix79 Exp $ */
#ifndef __DMA_H
#define __DMA_H
enum DMAEvent {
DMA_REACHED_TC,
DMA_MASKED,
DMA_UNMASKED,
DMA_TRANSFEREND
};
class DmaChannel;
typedef void (* DMA_CallBack)(DmaChannel * chan,DMAEvent event);
class DmaController {
public:
bool flipflop;
Bit8u ctrlnum;
Bit8u chanbase;
public:
DmaController(Bit8u num) {
flipflop = false;
ctrlnum = num;
chanbase = num * 4;
}
};
class DmaChannel {
public:
Bit32u pagebase;
Bit16u baseaddr;
Bit16u curraddr;
Bit16u basecnt;
Bit16u currcnt;
Bit8u channum;
Bit8u pagenum;
Bit8u DMA16;
bool increment;
bool autoinit;
Bit8u trantype;
bool masked;
bool tcount;
DMA_CallBack callback;
DmaChannel(Bit8u num, bool dma16);
void DoCallBack(DMAEvent event) {
if (callback) (*callback)(this,event);
}
void SetMask(bool _mask) {
masked=_mask;
DoCallBack(masked ? DMA_MASKED : DMA_UNMASKED);
}
void Register_Callback(DMA_CallBack _cb) {
callback = _cb;
SetMask(masked);
}
void ReachedTC(void) {
tcount=true;
DoCallBack(DMA_REACHED_TC);
}
void SetPage(Bit8u val) {
pagenum=val;
pagebase=(pagenum >> DMA16) << (16+DMA16);
}
Bitu Read(Bitu size, Bit8u * buffer);
Bitu Write(Bitu size, Bit8u * buffer);
};
extern DmaChannel *DmaChannels[8];
extern DmaController *DmaControllers[2];
#endif
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