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/* memory.h: memory access routines
Copyright (c) 2003-2004 Philip Kendall
$Id: memory.h 4099 2009-10-22 10:59:02Z fredm $
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
E-mail: philip-fuse@shadowmagic.org.uk
*/
#ifndef FUSE_MEMORY_H
#define FUSE_MEMORY_H
#include <libspectrum.h>
#include "spectrum.h"
typedef enum memory_bank {
MEMORY_BANK_NONE,
MEMORY_BANK_HOME,
MEMORY_BANK_DOCK,
MEMORY_BANK_EXROM,
MEMORY_BANK_ROMCS,
} memory_bank;
typedef enum memory_page_source {
MEMORY_SOURCE_SYSTEM,
MEMORY_SOURCE_CARTRIDGE,
MEMORY_SOURCE_PERIPHERAL,
MEMORY_SOURCE_CUSTOMROM,
} memory_page_source;
typedef struct memory_page {
libspectrum_byte *page; /* The data for this page */
int writable; /* Can we write to this data? */
int contended; /* Are reads/writes to this page contended? */
memory_bank bank; /* Which bank is mapped in here */
int page_num; /* Which page from the bank */
libspectrum_word offset; /* How far into the page this chunk starts */
memory_page_source source; /* Where did this page come from? */
} memory_page;
#define MEMORY_PAGE_SIZE 0x2000
/* Each 8Kb RAM chunk accessible by the Z80 */
extern memory_page memory_map_read[8];
extern memory_page memory_map_write[8];
/* 8 8Kb memory chunks accessible by the Z80 for normal RAM (home) and
the Timex Dock and Exrom */
extern memory_page *memory_map_home[8];
extern memory_page *memory_map_dock[8];
extern memory_page *memory_map_exrom[8];
extern memory_page memory_map_ram[ 2 * SPECTRUM_RAM_PAGES ];
extern memory_page memory_map_rom[ 8];
/* Which RAM page contains the current screen */
extern int memory_current_screen;
/* Which bits to look at when working out where the screen is */
extern libspectrum_word memory_screen_mask;
int memory_init( void );
libspectrum_byte *memory_pool_allocate( size_t length );
void memory_pool_free( void );
const char *memory_bank_name( memory_page *page );
/* Map in alternate bank if ROMCS is set */
void memory_romcs_map( void );
/* Have we loaded any custom ROMs? */
int memory_custom_rom( void );
libspectrum_byte readbyte( libspectrum_word address );
/* Use a macro for performance in the main core, but a function for
flexibility in the core tester */
#ifndef CORETEST
#define readbyte_internal( address ) \
memory_map_read[ (libspectrum_word)(address) >> 13 ].page[ (address) & 0x1fff ]
#else /* #ifndef CORETEST */
libspectrum_byte readbyte_internal( libspectrum_word address );
#endif /* #ifndef CORETEST */
void writebyte( libspectrum_word address, libspectrum_byte b );
void writebyte_internal( libspectrum_word address, libspectrum_byte b );
typedef void (*memory_display_dirty_fn)( libspectrum_word address,
libspectrum_byte b );
extern memory_display_dirty_fn memory_display_dirty;
void memory_display_dirty_sinclair( libspectrum_word address,
libspectrum_byte b );
void memory_display_dirty_pentagon_16_col( libspectrum_word address,
libspectrum_byte b );
#endif /* #ifndef FUSE_MEMORY_H */
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