diff options
Diffstat (limited to 'plugins/gme/game-music-emu-0.6pre/gme/Nes_Cpu.cpp')
| -rw-r--r-- | plugins/gme/game-music-emu-0.6pre/gme/Nes_Cpu.cpp | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Nes_Cpu.cpp b/plugins/gme/game-music-emu-0.6pre/gme/Nes_Cpu.cpp new file mode 100644 index 00000000..5cfb3db3 --- /dev/null +++ b/plugins/gme/game-music-emu-0.6pre/gme/Nes_Cpu.cpp @@ -0,0 +1,62 @@ +// Game_Music_Emu 0.6-pre. http://www.slack.net/~ant/ + +#include "Nes_Cpu.h" + +#include "blargg_endian.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" + +inline void Nes_Cpu::set_code_page( int i, void const* p ) +{ + byte const* p2 = STATIC_CAST(byte const*,p) - NES_CPU_OFFSET( i * page_size ); + cpu_state->code_map [i] = p2; + cpu_state_.code_map [i] = p2; +} + +void Nes_Cpu::map_code( addr_t start, int size, void const* data, int mirror_size ) +{ + // address range must begin and end on page boundaries + require( start % page_size == 0 ); + require( size % page_size == 0 ); + require( start + size <= 0x10000 ); + require( mirror_size % page_size == 0 ); + + for ( int offset = 0; offset < size; offset += page_size ) + set_code_page( NES_CPU_PAGE( start + offset ), + STATIC_CAST(char const*,data) + (offset & ((unsigned) mirror_size - 1)) ); +} + +void Nes_Cpu::reset( void const* unmapped_page ) +{ + check( cpu_state == &cpu_state_ ); + cpu_state = &cpu_state_; + + r.flags = irq_inhibit_mask; + r.sp = 0xFF; + r.pc = 0; + r.a = 0; + r.x = 0; + r.y = 0; + + cpu_state_.time = 0; + cpu_state_.base = 0; + irq_time_ = future_time; + end_time_ = future_time; + error_count_ = 0; + + set_code_page( page_count, unmapped_page ); + map_code( 0, 0x10000, unmapped_page, page_size ); + + blargg_verify_byte_order(); +} |