dma65.h

Go to the documentation of this file.

/* F018 DMA core emulation for MEGA65
   Part of the Xemu project.  https://github.com/lgblgblgb/xemu
   Copyright (C)2016-2022 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_MEGA65_DMA_H_INCLUDED
#define XEMU_MEGA65_DMA_H_INCLUDED
 
/* Feature bit masks for dma_init(): */
 
#define DMA_FEATURE_DYNMODESET  0x100
#define DMA_FEATURE_MODULO      0x200
#define DMA_FEATURE_HACK        0x400
 
/* Variables */
 
extern Uint8 dma_status;
extern Uint8 dma_registers[16];
extern int   dma_chip_revision;
 
/* 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, const Uint8 *rom );
extern void  dma_reset          ( void );
extern int   dma_update         ( void );
extern int   dma_update_multi_steps ( int do_for_cycles );
extern int   dma_is_in_use      ( void );
 
/* 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