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// Game_Music_Emu 0.6-pre. http://www.slack.net/~ant/
#include "Kss_Core.h"
#include "blargg_endian.h"
/* Copyright (C) 2006-2009 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"
Kss_Core::Kss_Core() : rom( Kss_Cpu::page_size )
{
memset( unmapped_read, 0xFF, sizeof unmapped_read );
}
Kss_Core::~Kss_Core() { }
void Kss_Core::unload()
{
rom.clear();
}
static blargg_err_t check_kss_header( void const* header )
{
if ( memcmp( header, "KSCC", 4 ) && memcmp( header, "KSSX", 4 ) )
return blargg_err_file_type;
return blargg_ok;
}
blargg_err_t Kss_Core::load_( Data_Reader& in )
{
memset( &header_, 0, sizeof header_ );
assert( offsetof (header_t,msx_audio_vol) == header_t::size - 1 );
RETURN_ERR( rom.load( in, header_t::base_size, &header_, 0 ) );
RETURN_ERR( check_kss_header( header_.tag ) );
header_.last_track [0] = 255;
if ( header_.tag [3] == 'C' )
{
if ( header_.extra_header )
{
header_.extra_header = 0;
set_warning( "Unknown data in header" );
}
if ( header_.device_flags & ~0x0F )
{
header_.device_flags &= 0x0F;
set_warning( "Unknown data in header" );
}
}
else if ( header_.extra_header )
{
if ( header_.extra_header != header_.ext_size )
{
header_.extra_header = 0;
set_warning( "Invalid extra_header_size" );
}
else
{
memcpy( header_.data_size, rom.begin(), header_.ext_size );
}
}
#ifndef NDEBUG
{
int ram_mode = header_.device_flags & 0x84; // MSX
if ( header_.device_flags & 0x02 ) // SMS
ram_mode = (header_.device_flags & 0x88);
if ( ram_mode )
dprintf( "RAM not supported\n" ); // TODO: support
}
#endif
return blargg_ok;
}
void Kss_Core::jsr( byte const (&addr) [2] )
{
ram [--cpu.r.sp] = idle_addr >> 8;
ram [--cpu.r.sp] = idle_addr & 0xFF;
cpu.r.pc = get_le16( addr );
}
blargg_err_t Kss_Core::start_track( int track )
{
memset( ram, 0xC9, 0x4000 );
memset( ram + 0x4000, 0, sizeof ram - 0x4000 );
// copy driver code to lo RAM
static byte const bios [] = {
0xD3, 0xA0, 0xF5, 0x7B, 0xD3, 0xA1, 0xF1, 0xC9, // $0001: WRTPSG
0xD3, 0xA0, 0xDB, 0xA2, 0xC9 // $0009: RDPSG
};
static byte const vectors [] = {
0xC3, 0x01, 0x00, // $0093: WRTPSG vector
0xC3, 0x09, 0x00, // $0096: RDPSG vector
};
memcpy( ram + 0x01, bios, sizeof bios );
memcpy( ram + 0x93, vectors, sizeof vectors );
// copy non-banked data into RAM
int load_addr = get_le16( header_.load_addr );
int orig_load_size = get_le16( header_.load_size );
int load_size = min( orig_load_size, rom.file_size() );
load_size = min( load_size, (int) mem_size - load_addr );
if ( load_size != orig_load_size )
set_warning( "Excessive data size" );
memcpy( ram + load_addr, rom.begin() + header_.extra_header, load_size );
rom.set_addr( -load_size - header_.extra_header );
// check available bank data
int const bank_size = this->bank_size();
int max_banks = (rom.file_size() - load_size + bank_size - 1) / bank_size;
bank_count = header_.bank_mode & 0x7F;
if ( bank_count > max_banks )
{
bank_count = max_banks;
set_warning( "Bank data missing" );
}
//dprintf( "load_size : $%X\n", load_size );
//dprintf( "bank_size : $%X\n", bank_size );
//dprintf( "bank_count: %d (%d claimed)\n", bank_count, header_.bank_mode & 0x7F );
ram [idle_addr] = 0xFF;
cpu.reset( unmapped_write, unmapped_read );
cpu.map_mem( 0, mem_size, ram, ram );
cpu.r.sp = 0xF380;
cpu.r.b.a = track;
cpu.r.b.h = 0;
next_play = play_period;
gain_updated = false;
jsr( header_.init_addr );
return blargg_ok;
}
void Kss_Core::set_bank( int logical, int physical )
{
int const bank_size = this->bank_size();
int addr = 0x8000;
if ( logical && bank_size == 8 * 1024 )
addr = 0xA000;
physical -= header_.first_bank;
if ( (unsigned) physical >= (unsigned) bank_count )
{
byte* data = ram + addr;
cpu.map_mem( addr, bank_size, data, data );
}
else
{
int phys = physical * bank_size;
for ( int offset = 0; offset < bank_size; offset += cpu.page_size )
cpu.map_mem( addr + offset, cpu.page_size,
unmapped_write, rom.at_addr( phys + offset ) );
}
}
void Kss_Core::cpu_out( time_t, addr_t addr, int data )
{
dprintf( "OUT $%04X,$%02X\n", addr, data );
}
int Kss_Core::cpu_in( time_t, addr_t addr )
{
dprintf( "IN $%04X\n", addr );
return 0xFF;
}
blargg_err_t Kss_Core::end_frame( time_t end )
{
while ( cpu.time() < end )
{
time_t next = min( end, next_play );
run_cpu( next );
if ( cpu.r.pc == idle_addr )
cpu.set_time( next );
if ( cpu.time() >= next_play )
{
next_play += play_period;
if ( cpu.r.pc == idle_addr )
{
if ( !gain_updated )
{
gain_updated = true;
update_gain();
}
jsr( header_.play_addr );
}
}
}
next_play -= end;
check( next_play >= 0 );
cpu.adjust_time( -end );
return blargg_ok;
}
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