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a603fc47b34180c650ca63d290a620c3e5cd4534
fuse/memory.c
Philip Kendall 768ceba351 Remove unnecessary 'break's in tc2048_readbyte. 
Legacy-ID: 1008
2003-02-05 23:04:09 +00:00

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8.8 KiB
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/* memory.c: Routines for accessing memory
Copyright (c) 1999-2002 Philip Kendall
$Id$
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
Author contact information:
E-mail: pak21-fuse@srcf.ucam.org
Postal address: 15 Crescent Road, Wokingham, Berks, RG40 2DB, England
*/
/* Note that this file is compiled twice: once to produce the 'normal'
versions of these functions, and once to produce the '_internal'
versions, which do not trigger breakpoints. This behaviour is
controlled by the 'INTERNAL' macro
*/
#include <config.h>
#include "debugger/debugger.h"
#include "display.h"
#include "machine.h"
#include "settings.h"
#include "spectrum.h"
#include "types.h"
#include "ui/ui.h"
#ifdef INTERNAL
#define FUNCTION( name ) name##_internal
#else /* #ifdef INTERNAL */
#define FUNCTION( name ) name
#endif /* #ifdef INTERNAL */
BYTE
FUNCTION( spec16_readbyte )( WORD address )
{
#ifndef INTERNAL
if( debugger_mode != DEBUGGER_MODE_INACTIVE &&
debugger_check( DEBUGGER_BREAKPOINT_TYPE_READ, address ) )
debugger_mode = DEBUGGER_MODE_HALTED;
#endif /* #ifndef INTERNAL */
switch( address >> 14 ) {
case 0: return ROM[0][ address & 0x3fff ];
case 1: return RAM[5][ address & 0x3fff ];
case 2: return 0xff;
case 3: return 0xff;
}
return 0; /* Keep gcc happy */
}
void
FUNCTION( spec16_writebyte )( WORD address, BYTE b )
{
#ifndef INTERNAL
if( debugger_mode != DEBUGGER_MODE_INACTIVE &&
debugger_check( DEBUGGER_BREAKPOINT_TYPE_WRITE, address ) )
debugger_mode = DEBUGGER_MODE_HALTED;
#endif /* #ifndef INTERNAL */
switch( address >> 14 ) {
case 0:
if( settings_current.writable_roms ) ROM[0][ address & 0x3fff ] = b;
break;
case 1:
if( ( address & 0x3fff ) < 0x1b00 && RAM[5][ address & 0x3fff ] != b )
display_dirty( address );
RAM[5][ address & 0x3fff ] = b; break;
case 2: break;
case 3: break;
}
}
BYTE
FUNCTION( spec48_readbyte )( WORD address )
{
#ifndef INTERNAL
if( debugger_mode != DEBUGGER_MODE_INACTIVE &&
debugger_check( DEBUGGER_BREAKPOINT_TYPE_READ, address ) )
debugger_mode = DEBUGGER_MODE_HALTED;
#endif /* #ifndef INTERNAL */
switch( address >> 14 ) {
case 0: return ROM[0][ address & 0x3fff ];
case 1: return RAM[5][ address & 0x3fff ];
case 2: return RAM[2][ address & 0x3fff ];
case 3: return RAM[0][ address & 0x3fff ];
}
return 0; /* Keep gcc happy */
}
void
FUNCTION( spec48_writebyte )( WORD address, BYTE b )
{
#ifndef INTERNAL
if( debugger_mode != DEBUGGER_MODE_INACTIVE &&
debugger_check( DEBUGGER_BREAKPOINT_TYPE_WRITE, address ) )
debugger_mode = DEBUGGER_MODE_HALTED;
#endif /* #ifndef INTERNAL */
switch( address >> 14 ) {
case 0:
if( settings_current.writable_roms ) ROM[0][ address & 0x3fff ] = b;
break;
case 1:
if( ( address & 0x3fff ) < 0x1b00 && RAM[5][ address & 0x3fff ] != b )
display_dirty( address );
RAM[5][ address & 0x3fff ] = b; break;
case 2: RAM[2][ address & 0x3fff ] = b; break;
case 3: RAM[0][ address & 0x3fff ] = b; break;
}
}
BYTE
FUNCTION( spec128_readbyte )( WORD address )
{
#ifndef INTERNAL
if( debugger_mode != DEBUGGER_MODE_INACTIVE &&
debugger_check( DEBUGGER_BREAKPOINT_TYPE_READ, address ) )
debugger_mode = DEBUGGER_MODE_HALTED;
#endif /* #ifndef INTERNAL */
switch( address >> 14 ) {
case 0: return ROM[ machine_current->ram.current_rom][ address & 0x3fff ];
case 1: return RAM[ 5][ address & 0x3fff ];
case 2: return RAM[ 2][ address & 0x3fff ];
case 3: return RAM[machine_current->ram.current_page][ address & 0x3fff ];
}
return 0; /* Keep gcc happy */
}
void
FUNCTION( spec128_writebyte )( WORD address, BYTE b )
{
int bank = address >> 14;
#ifndef INTERNAL
if( debugger_mode != DEBUGGER_MODE_INACTIVE &&
debugger_check( DEBUGGER_BREAKPOINT_TYPE_WRITE, address ) )
debugger_mode = DEBUGGER_MODE_HALTED;
#endif /* #ifndef INTERNAL */
switch( bank ) {
case 0:
if( settings_current.writable_roms )
ROM[ machine_current->ram.current_rom ][ address & 0x3fff ] = b;
return;
case 1: bank = 5; break;
case 2: bank = 2; break;
case 3: bank = machine_current->ram.current_page; break;
}
if( bank == machine_current->ram.current_screen &&
( address & 0x3fff ) < 0x1b00 &&
RAM[ bank ][ address & 0x3fff ] != b )
display_dirty( ( address & 0x3fff ) | 0x4000 );
RAM[ bank ][ address & 0x3fff ] = b;
}
BYTE
FUNCTION( specplus3_readbyte )( WORD address )
{
#ifndef INTERNAL
if( debugger_mode != DEBUGGER_MODE_INACTIVE &&
debugger_check( DEBUGGER_BREAKPOINT_TYPE_READ, address ) )
debugger_mode = DEBUGGER_MODE_HALTED;
#endif /* #ifndef INTERNAL */
if( machine_current->ram.special ) {
switch( machine_current->ram.specialcfg ) {
case 0: return RAM[ address >> 14 ][ address & 0x3fff ];
case 1: return RAM[ ( address >> 14 ) + 4 ][ address & 0x3fff ];
case 2: switch( address >> 14 ) {
case 0: return RAM[4][ address & 0x3fff ];
case 1: return RAM[5][ address & 0x3fff ];
case 2: return RAM[6][ address & 0x3fff ];
case 3: return RAM[3][ address & 0x3fff ];
}
case 3: switch( address >> 14 ) {
case 0: return RAM[4][ address & 0x3fff ];
case 1: return RAM[7][ address & 0x3fff ];
case 2: return RAM[6][ address & 0x3fff ];
case 3: return RAM[3][ address & 0x3fff ];
}
default:
ui_error( UI_ERROR_ERROR, "Unknown +3 special configuration %d",
machine_current->ram.specialcfg );
fuse_abort();
}
} else {
switch( address >> 14 ) {
case 0: return ROM[ machine_current->ram.current_rom][ address & 0x3fff ];
case 1: return RAM[ 5][ address & 0x3fff ];
case 2: return RAM[ 2][ address & 0x3fff ];
case 3: return RAM[machine_current->ram.current_page][ address & 0x3fff ];
}
}
return 0; /* Keep gcc happy */
}
void
FUNCTION( specplus3_writebyte )( WORD address, BYTE b )
{
int bank = address >> 14;
#ifndef INTERNAL
if( debugger_mode != DEBUGGER_MODE_INACTIVE &&
debugger_check( DEBUGGER_BREAKPOINT_TYPE_WRITE, address ) )
debugger_mode = DEBUGGER_MODE_HALTED;
#endif /* #ifndef INTERNAL */
if( machine_current->ram.special ) {
switch( machine_current->ram.specialcfg ) {
case 0: break;
case 1: bank+=4; break;
case 2:
switch( bank ) {
case 0: bank=4; break;
case 1: bank=5; break;
case 2: bank=6; break;
case 3: bank=3; break;
}
break;
case 3: switch( bank ) {
case 0: bank=4; break;
case 1: bank=7; break;
case 2: bank=6; break;
case 3: bank=3; break;
}
break;
}
} else {
switch( bank ) {
case 0:
if( settings_current.writable_roms )
ROM[ machine_current->ram.current_rom ][ address & 0x3fff ] = b;
return;
case 1: bank=5; break;
case 2: bank=2; break;
case 3: bank=machine_current->ram.current_page; break;
}
}
if( bank == machine_current->ram.current_screen &&
( address & 0x3fff ) < 0x1b00 &&
RAM[ bank ][ address & 0x3fff ] != b )
display_dirty( ( address & 0x3fff ) | 0x4000 );
RAM[ bank ][ address & 0x3fff ] = b;
}
BYTE
FUNCTION( tc2048_readbyte )( WORD address )
{
WORD offset = address & 0x3fff;
#ifndef INTERNAL
if( debugger_mode != DEBUGGER_MODE_INACTIVE &&
debugger_check( DEBUGGER_BREAKPOINT_TYPE_READ, address ) )
debugger_mode = DEBUGGER_MODE_HALTED;
#endif /* #ifndef INTERNAL */
switch( address >> 14 ) {
case 0: return ROM[0][offset];
case 1: return RAM[5][offset];
case 2: return RAM[2][offset];
case 3: return RAM[0][offset];
}
return 0; /* Keep gcc happy */
}
void
FUNCTION( tc2048_writebyte )( WORD address, BYTE b )
{
WORD offset = address & 0x3fff;
#ifndef INTERNAL
if( debugger_mode != DEBUGGER_MODE_INACTIVE &&
debugger_check( DEBUGGER_BREAKPOINT_TYPE_WRITE, address ) )
debugger_mode = DEBUGGER_MODE_HALTED;
#endif /* #ifndef INTERNAL */
switch( address >> 14 ) {
case 0:
if( settings_current.writable_roms ) ROM[0][ address & 0x3fff ] = b;
break;
case 1:
if( RAM[5][offset] != b ) { display_dirty( address ); RAM[5][offset] = b; }
break;
case 2: RAM[2][offset]=b; break;
case 3: RAM[0][offset]=b; break;
}
}
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