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63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
/*
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* COPYRIGHT: GPL - See COPYING in the top level directory
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* PROJECT: ReactOS Virtual DOS Machine
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* FILE: subsystems/mvdm/ntvdm/hardware/dma.h
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* PURPOSE: ISA DMA - Direct Memory Access Controller emulation -
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* i8237A compatible with 74LS612 Memory Mapper extension
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* PROGRAMMERS: Hermes Belusca-Maito (hermes.belusca@sfr.fr)
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*/
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#ifndef _DMA_H_
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#define _DMA_H_
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/* DEFINES ********************************************************************/
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#define DMA_CONTROLLERS 2
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#define DMA_CONTROLLER_CHANNELS 4 // Each DMA controller has 4 channels
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typedef struct _DMA_CHANNEL
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{
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WORD BaseAddress;
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WORD BaseElemCnt;
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WORD CurrAddress;
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WORD CurrElemCnt;
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BYTE Mode;
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} DMA_CHANNEL, *PDMA_CHANNEL;
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typedef struct _DMA_CONTROLLER
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{
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DMA_CHANNEL DmaChannel[DMA_CONTROLLER_CHANNELS];
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WORD TempAddress;
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WORD TempElemCnt;
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BYTE TempReg;
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BYTE Command;
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BYTE Request;
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BYTE Mask;
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BYTE Status;
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BOOLEAN FlipFlop; // 0: LSB ; 1: MSB
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} DMA_CONTROLLER, *PDMA_CONTROLLER;
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/* 74LS612 Memory Mapper extension */
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typedef struct _DMA_PAGE_REGISTER
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{
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BYTE Page;
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} DMA_PAGE_REGISTER, *PDMA_PAGE_REGISTER;
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// The 74LS612 contains 16 bytes, each of them being a page register.
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// They are accessible via ports 0x80 through 0x8F.
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/* FUNCTIONS ******************************************************************/
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DWORD DmaRequest(IN WORD iChannel,
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IN OUT PVOID Buffer,
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IN DWORD length);
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VOID DmaInitialize(VOID);
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#endif /* _DMA_H_ */
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