dma65.h

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/* F018 DMA core emulation for Commodore 65.
   Part of the Xemu project. https://github.com/lgblgblgb/xemu
   Copyright (C)2016-2021 LGB (Gábor Lénárt) <lgblgblgb@gmail.com>
 
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 */
 
#ifndef XEMU_C65_DMA65_H_INCLUDED
#define XEMU_C65_DMA65_H_INCLUDED
 
/* Feature bit masks for dma_init(): */
 
#define DMA_FEATURE_DYNMODESET  0x100
#define DMA_FEATURE_MODULO      0x200
 
/* Variables */
 
extern Uint8 dma_status;
extern Uint8 dma_registers[16];
extern int   dma_chip_revision;
extern int   rom_date;
 
/* Functions: */
 
extern void  dma_write_reg      ( int addr, Uint8 data );
extern Uint8 dma_read_reg       ( int reg );
extern void  dma_init           ( unsigned int revision );
extern void  dma_init_set_rev   ( unsigned int revision, Uint8 *rom_ver_signature );
extern void  dma_reset          ( void );
extern int   dma_update         ( void );
extern int   dma_update_multi_steps ( int do_for_cycles );
 
extern void  detect_rom_date    ( Uint8 *p );
 
/* Things should be provided by the emulator: */
 
extern Uint8 DMA_SOURCE_IOREADER_FUNC   ( int );
extern Uint8 DMA_SOURCE_MEMREADER_FUNC  ( int );
extern Uint8 DMA_TARGET_IOREADER_FUNC   ( int );
extern Uint8 DMA_TARGET_MEMREADER_FUNC  ( int );
extern Uint8 DMA_LIST_READER_FUNC       ( int );
extern void  DMA_SOURCE_IOWRITER_FUNC   ( int, Uint8 );
extern void  DMA_SOURCE_MEMWRITER_FUNC  ( int, Uint8 );
extern void  DMA_TARGET_IOWRITER_FUNC   ( int, Uint8 );
extern void  DMA_TARGET_MEMWRITER_FUNC  ( int, Uint8 );
 
/* Snapshot related part: */
 
#ifdef XEMU_SNAPSHOT_SUPPORT
#include "xemu/emutools_snapshot.h"
extern int dma_snapshot_load_state ( const struct xemu_snapshot_definition_st *def, struct xemu_snapshot_block_st *block );
extern int dma_snapshot_save_state ( const struct xemu_snapshot_definition_st *def );
#endif
 
#endif