c7c9cc2430
DMA functions defined. Most of the changes are based on the "bochs sync"
version of plex86. Here is the list of changes:
* register/unregister functions for DMA channels added. The DMA controller
can use the DMA read/write handlers of registered devices directly.
* "hardwired" code in dma.cc removed
* all DMA related code in devices.cc and iodev.h removed
* DMA related code in pc_system.* removed except HRQ handling
* macros for DMA functions defined in bochs.h
* floppy and SB16 code modified to use the changes described above
115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: dma.h,v 1.8 2002-06-16 15:02:27 vruppert Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2002 MandrakeSoft S.A.
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//
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// MandrakeSoft S.A.
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// 43, rue d'Aboukir
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// 75002 Paris - France
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// http://www.linux-mandrake.com/
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// http://www.mandrakesoft.com/
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#ifndef _PCDMA_H
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#define _PCDMA_H
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#if BX_USE_DMA_SMF
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# define BX_DMA_SMF static
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# define BX_DMA_THIS bx_dma.
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#else
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# define BX_DMA_SMF
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# define BX_DMA_THIS this->
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#endif
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class bx_dma_c : public logfunctions {
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public:
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bx_dma_c();
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~bx_dma_c(void);
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BX_DMA_SMF void init(bx_devices_c *);
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BX_DMA_SMF void raise_HLDA(void);
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BX_DMA_SMF void set_DRQ(unsigned channel, Boolean val);
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BX_DMA_SMF unsigned get_TC(void);
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BX_DMA_SMF unsigned registerDMA8Channel(unsigned channel,
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void (* dmaRead)(Bit8u *data_byte),
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void (* dmaWrite)(Bit8u *data_byte),
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const char *name);
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BX_DMA_SMF unsigned registerDMA16Channel(unsigned channel,
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void (* dmaRead)(Bit16u *data_word),
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void (* dmaWrite)(Bit16u *data_word),
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const char *name);
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BX_DMA_SMF unsigned unregisterDMAChannel(unsigned channel);
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private:
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static Bit32u read_handler(void *this_ptr, Bit32u address, unsigned io_len);
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static void write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len);
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#if !BX_USE_DMA_SMF
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Bit32u read( Bit32u address, unsigned io_len);
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void write(Bit32u address, Bit32u value, unsigned io_len);
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#endif
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BX_DMA_SMF void control_HRQ(Boolean ma_sl);
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struct {
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Boolean DRQ[4]; // DMA Request
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Boolean DACK[4]; // DMA Acknowlege
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Boolean mask[4];
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Boolean flip_flop;
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Bit8u status_reg;
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Bit8u command_reg;
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Bit8u request_reg;
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Bit8u temporary_reg;
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struct {
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struct {
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Bit8u mode_type;
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Bit8u address_decrement;
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Bit8u autoinit_enable;
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Bit8u transfer_type;
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} mode;
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Bit16u base_address;
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Bit16u current_address;
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Bit16u base_count;
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Bit16u current_count;
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Bit8u page_reg;
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Boolean used;
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} chan[4]; /* DMA channels 0..3 */
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} s[2]; // state information DMA-1 / DMA-2
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Boolean HLDA; // Hold Acknowlege
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Boolean TC; // Terminal Count
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struct {
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void (* dmaRead8)(Bit8u *data_byte);
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void (* dmaWrite8)(Bit8u *data_byte);
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void (* dmaRead16)(Bit16u *data_word);
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void (* dmaWrite16)(Bit16u *data_word);
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} h[4]; // DMA read and write handlers
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bx_devices_c *devices;
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};
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extern bx_dma_c bx_dma;
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#endif // #ifndef _PCDMA_H
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