f40bfc9267
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
// Game_Music_Emu 0.6-pre. http://www.slack.net/~ant/
|
|
|
|
#include "z80_cpu.h"
|
|
|
|
/* Copyright (C) 2006-2008 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"
|
|
|
|
// flags, named with hex value for clarity
|
|
int const S80 = 0x80;
|
|
int const Z40 = 0x40;
|
|
int const F20 = 0x20;
|
|
int const H10 = 0x10;
|
|
int const F08 = 0x08;
|
|
int const V04 = 0x04;
|
|
int const P04 = 0x04;
|
|
int const N02 = 0x02;
|
|
int const C01 = 0x01;
|
|
|
|
void Z80_init( struct Z80_Cpu* this )
|
|
{
|
|
this->cpu_state = &this->cpu_state_;
|
|
|
|
int i;
|
|
for ( i = 0x100; --i >= 0; )
|
|
{
|
|
int p, even = 1;
|
|
for ( p = i; p; p >>= 1 )
|
|
even ^= p;
|
|
int n = (i & (S80 | F20 | F08)) | ((even & 1) * P04);
|
|
this->szpc [i] = n;
|
|
this->szpc [i + 0x100] = n | C01;
|
|
}
|
|
this->szpc [0x000] |= Z40;
|
|
this->szpc [0x100] |= Z40;
|
|
}
|
|
|
|
static inline void set_page( struct Z80_Cpu* this, int i, void* write, void const* read )
|
|
{
|
|
int offset = Z80_CPU_OFFSET( i * page_size );
|
|
byte * write2 = STATIC_CAST(byte *,write) - offset;
|
|
byte const* read2 = STATIC_CAST(byte const*,read ) - offset;
|
|
this->cpu_state_.write [i] = write2;
|
|
this->cpu_state_.read [i] = read2;
|
|
this->cpu_state->write [i] = write2;
|
|
this->cpu_state->read [i] = read2;
|
|
}
|
|
|
|
void Z80_reset( struct Z80_Cpu* this, void* unmapped_write, void const* unmapped_read )
|
|
{
|
|
check( this->cpu_state == &this->cpu_state_ );
|
|
this->cpu_state = &this->cpu_state_;
|
|
this->cpu_state_.time = 0;
|
|
this->cpu_state_.base = 0;
|
|
this->end_time_ = 0;
|
|
|
|
int i;
|
|
for ( i = 0; i < page_count + 1; i++ )
|
|
set_page( this, i, unmapped_write, unmapped_read );
|
|
|
|
memset( &this->r, 0, sizeof this->r );
|
|
}
|
|
|
|
void Z80_map_mem( struct Z80_Cpu* this, addr_t start, int size, void* write, void const* read )
|
|
{
|
|
// address range must begin and end on page boundaries
|
|
require( start % page_size == 0 );
|
|
require( size % page_size == 0 );
|
|
require( start + size <= 0x10000 );
|
|
|
|
int offset;
|
|
for ( offset = 0; offset < size; offset += page_size )
|
|
set_page( this, (start + offset) >> page_bits,
|
|
STATIC_CAST(char *,write) + offset,
|
|
STATIC_CAST(char const*,read ) + offset );
|
|
}
|