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https://git.code.sf.net/p/fuse-emulator/fuse
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119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/* memory.h: memory access routines
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Copyright (c) 2003-2004 Philip Kendall
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$Id$
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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Author contact information:
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E-mail: philip-fuse@shadowmagic.org.uk
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*/
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#ifndef FUSE_MEMORY_H
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#define FUSE_MEMORY_H
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#include <libspectrum.h>
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#include "spectrum.h"
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typedef enum memory_bank {
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MEMORY_BANK_NONE,
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MEMORY_BANK_HOME,
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MEMORY_BANK_DOCK,
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MEMORY_BANK_EXROM,
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MEMORY_BANK_ROMCS,
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} memory_bank;
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typedef enum memory_page_source {
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MEMORY_SOURCE_SYSTEM,
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MEMORY_SOURCE_CARTRIDGE,
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MEMORY_SOURCE_PERIPHERAL,
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} memory_page_source;
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typedef struct memory_page {
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libspectrum_byte *page; /* The data for this page */
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int writable; /* Can we write to this data? */
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int contended; /* Are reads/writes to this page contended? */
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memory_bank bank; /* Which bank is mapped in here */
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int page_num; /* Which page from the bank */
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libspectrum_word offset; /* How far into the page this chunk starts */
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memory_page_source source; /* Where did this page come from? */
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} memory_page;
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#define MEMORY_PAGE_SIZE 0x2000
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/* Each 8Kb RAM chunk accessible by the Z80 */
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extern memory_page memory_map_read[8];
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extern memory_page memory_map_write[8];
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/* Two 8Kb memory chunks accessible by the Z80 when /ROMCS is low */
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extern memory_page memory_map_romcs[2];
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/* 8 8Kb memory chunks accessible by the Z80 for normal RAM (home) and
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the Timex Dock and Exrom */
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extern memory_page *memory_map_home[8];
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extern memory_page *memory_map_dock[8];
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extern memory_page *memory_map_exrom[8];
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extern memory_page memory_map_ram[ 2 * SPECTRUM_RAM_PAGES ];
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extern memory_page memory_map_rom[ 8];
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/* Which RAM page contains the current screen */
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extern int memory_current_screen;
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/* Which bits to look at when working out where the screen is */
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extern libspectrum_word memory_screen_mask;
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int memory_init( void );
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libspectrum_byte *memory_pool_allocate( size_t length );
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void memory_pool_free( void );
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const char *memory_bank_name( memory_page *page );
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/* Map in alternate bank if ROMCS is set */
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void memory_romcs_map( void );
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libspectrum_byte readbyte( libspectrum_word address );
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/* Use a macro for performance in the main core, but a function for
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flexibility in the core tester */
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#ifndef CORETEST
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#define readbyte_internal( address ) \
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memory_map_read[ (libspectrum_word)(address) >> 13 ].page[ (address) & 0x1fff ]
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#else /* #ifndef CORETEST */
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libspectrum_byte readbyte_internal( libspectrum_word address );
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#endif /* #ifndef CORETEST */
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void writebyte( libspectrum_word address, libspectrum_byte b );
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void writebyte_internal( libspectrum_word address, libspectrum_byte b );
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#endif /* #ifndef FUSE_MEMORY_H */
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