86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
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// Game_Music_Emu 0.6-pre. http://www.slack.net/~ant/
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#include "z80_cpu.h"
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/* Copyright (C) 2006-2008 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details. You should have received a copy of the GNU Lesser General Public
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License along with this module; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "blargg_source.h"
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// flags, named with hex value for clarity
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int const S80 = 0x80;
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int const Z40 = 0x40;
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int const F20 = 0x20;
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int const H10 = 0x10;
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int const F08 = 0x08;
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int const V04 = 0x04;
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int const P04 = 0x04;
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int const N02 = 0x02;
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int const C01 = 0x01;
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void Z80_init( struct Z80_Cpu* this )
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{
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this->cpu_state = &this->cpu_state_;
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int i;
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for ( i = 0x100; --i >= 0; )
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{
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int p, even = 1;
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for ( p = i; p; p >>= 1 )
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even ^= p;
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int n = (i & (S80 | F20 | F08)) | ((even & 1) * P04);
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this->szpc [i] = n;
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this->szpc [i + 0x100] = n | C01;
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}
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this->szpc [0x000] |= Z40;
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this->szpc [0x100] |= Z40;
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}
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inline void set_page( struct Z80_Cpu* this, int i, void* write, void const* read )
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{
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int offset = Z80_CPU_OFFSET( i * page_size );
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byte * write2 = STATIC_CAST(byte *,write) - offset;
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byte const* read2 = STATIC_CAST(byte const*,read ) - offset;
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this->cpu_state_.write [i] = write2;
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this->cpu_state_.read [i] = read2;
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this->cpu_state->write [i] = write2;
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this->cpu_state->read [i] = read2;
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}
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void Z80_reset( struct Z80_Cpu* this, void* unmapped_write, void const* unmapped_read )
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{
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check( this->cpu_state == &this->cpu_state_ );
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this->cpu_state = &this->cpu_state_;
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this->cpu_state_.time = 0;
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this->cpu_state_.base = 0;
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this->end_time_ = 0;
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int i;
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for ( i = 0; i < page_count + 1; i++ )
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set_page( this, i, unmapped_write, unmapped_read );
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memset( &this->r, 0, sizeof this->r );
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}
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void Z80_map_mem( struct Z80_Cpu* this, addr_t start, int size, void* write, void const* read )
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{
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// address range must begin and end on page boundaries
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require( start % page_size == 0 );
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require( size % page_size == 0 );
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require( start + size <= 0x10000 );
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int offset;
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for ( offset = 0; offset < size; offset += page_size )
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set_page( this, (start + offset) >> page_bits,
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STATIC_CAST(char *,write) + offset,
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STATIC_CAST(char const*,read ) + offset );
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}
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