cog/Frameworks/GME/gme/Hes_Cpu.cpp

124 lines
2.9 KiB
C++

// $package. http://www.slack.net/~ant/
#include "Hes_Cpu.h"
#include "blargg_endian.h"
#include "Hes_Core.h"
//#include "hes_cpu_log.h"
/* Copyright (C) 2003-2008 Shay Green. This module is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. This
module 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 Lesser General Public License for more
details. You should have received a copy of the GNU Lesser General Public
License along with this module; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
#include "blargg_source.h"
#define PAGE HES_CPU_PAGE
int Hes_Core::read_mem( addr_t addr )
{
check( addr < 0x10000 );
int result = *cpu.get_code( addr );
if ( cpu.mmr [PAGE( addr )] == 0xFF )
result = read_mem_( addr );
return result;
}
void Hes_Core::write_mem( addr_t addr, int data )
{
check( addr < 0x10000 );
byte* out = write_pages [PAGE( addr )];
if ( out )
out [addr & (cpu.page_size - 1)] = data;
else if ( cpu.mmr [PAGE( addr )] == 0xFF )
write_mem_( addr, data );
}
void Hes_Core::set_mmr( int page, int bank )
{
write_pages [page] = 0;
byte* data = rom.at_addr( bank * cpu.page_size );
if ( bank >= 0x80 )
{
data = 0;
switch ( bank )
{
case 0xF8:
data = ram;
break;
case 0xF9:
case 0xFA:
case 0xFB:
data = &sgx [(bank - 0xF9) * cpu.page_size];
break;
default:
if ( bank != 0xFF )
dprintf( "Unmapped bank $%02X\n", bank );
data = rom.unmapped();
goto end;
}
write_pages [page] = data;
}
end:
cpu.set_mmr( page, bank, data );
}
#define READ_FAST( addr, out ) \
{\
out = READ_CODE( addr );\
if ( CPU.mmr [PAGE( addr )] == 0xFF )\
{\
FLUSH_TIME();\
out = read_mem_( addr );\
CACHE_TIME();\
}\
}
#define WRITE_FAST( addr, data ) \
{\
int page = PAGE( addr );\
byte* out = write_pages [page];\
addr &= CPU.page_size - 1;\
if ( out )\
{\
out [addr] = data;\
}\
else if ( CPU.mmr [page] == 0xFF )\
{\
FLUSH_TIME();\
write_mem_( addr, data );\
CACHE_TIME();\
}\
}
#define READ_LOW( addr ) (ram [addr])
#define WRITE_LOW( addr, data ) (ram [addr] = data)
#define READ_MEM( addr ) read_mem( addr )
#define WRITE_MEM( addr, data ) write_mem( addr, data )
#define WRITE_VDP( addr, data ) write_vdp( addr, data )
#define CPU_DONE( result_out ) { FLUSH_TIME(); result_out = cpu_done(); CACHE_TIME(); }
#define SET_MMR( reg, bank ) set_mmr( reg, bank )
#define CPU cpu
#define IDLE_ADDR idle_addr
#define CPU_BEGIN \
bool Hes_Core::run_cpu( time_t end_time )\
{\
cpu.set_end_time( end_time );
#include "Hes_Cpu_run.h"
return illegal_encountered;
}