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Diffstat (limited to 'plugins/gme/game-music-emu-0.6pre/gme/Z80_Cpu.cpp')
| -rw-r--r-- | plugins/gme/game-music-emu-0.6pre/gme/Z80_Cpu.cpp | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Z80_Cpu.cpp b/plugins/gme/game-music-emu-0.6pre/gme/Z80_Cpu.cpp new file mode 100644 index 00000000..cfc71b7c --- /dev/null +++ b/plugins/gme/game-music-emu-0.6pre/gme/Z80_Cpu.cpp @@ -0,0 +1,82 @@ +// 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; + +Z80_Cpu::Z80_Cpu() +{ + cpu_state = &cpu_state_; + + for ( int i = 0x100; --i >= 0; ) + { + int even = 1; + for ( int p = i; p; p >>= 1 ) + even ^= p; + int n = (i & (S80 | F20 | F08)) | ((even & 1) * P04); + szpc [i] = n; + szpc [i + 0x100] = n | C01; + } + szpc [0x000] |= Z40; + szpc [0x100] |= Z40; +} + +inline void Z80_Cpu::set_page( 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; + cpu_state_.write [i] = write2; + cpu_state_.read [i] = read2; + cpu_state->write [i] = write2; + cpu_state->read [i] = read2; +} + +void Z80_Cpu::reset( void* unmapped_write, void const* unmapped_read ) +{ + check( cpu_state == &cpu_state_ ); + cpu_state = &cpu_state_; + cpu_state_.time = 0; + cpu_state_.base = 0; + end_time_ = 0; + + for ( int i = 0; i < page_count + 1; i++ ) + set_page( i, unmapped_write, unmapped_read ); + + memset( &r, 0, sizeof r ); +} + +void Z80_Cpu::map_mem( 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 ); + + for ( int offset = 0; offset < size; offset += page_size ) + set_page( (start + offset) >> page_bits, + STATIC_CAST(char *,write) + offset, + STATIC_CAST(char const*,read ) + offset ); +} |