63 lines
2.0 KiB
C++
63 lines
2.0 KiB
C++
// $package. http://www.slack.net/~ant/
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#include "Nes_Cpu.h"
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#include "blargg_endian.h"
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/* Copyright (C) 2003-2008 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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inline void Nes_Cpu::set_code_page( int i, void const* p )
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{
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byte const* p2 = STATIC_CAST(byte const*,p) - NES_CPU_OFFSET( i * page_size );
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cpu_state->code_map [i] = p2;
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cpu_state_.code_map [i] = p2;
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}
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void Nes_Cpu::map_code( addr_t start, int size, void const* data, int mirror_size )
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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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require( mirror_size % page_size == 0 );
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for ( int offset = 0; offset < size; offset += page_size )
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set_code_page( NES_CPU_PAGE( start + offset ),
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STATIC_CAST(char const*,data) + (offset & ((unsigned) mirror_size - 1)) );
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}
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void Nes_Cpu::reset( void const* unmapped_page )
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{
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check( cpu_state == &cpu_state_ );
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cpu_state = &cpu_state_;
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r.flags = irq_inhibit_mask;
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r.sp = 0xFF;
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r.pc = 0;
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r.a = 0;
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r.x = 0;
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r.y = 0;
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cpu_state_.time = 0;
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cpu_state_.base = 0;
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irq_time_ = future_time;
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end_time_ = future_time;
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error_count_ = 0;
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set_code_page( page_count, unmapped_page );
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map_code( 0, 0x10000, unmapped_page, page_size );
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blargg_verify_byte_order();
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}
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