acb0917556
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30264 a1c6a512-1295-4272-9138-f99709370657
62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
// Game_Music_Emu 0.6-pre. 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 set_code_page( struct Nes_Cpu* this, 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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this->cpu_state->code_map [i] = p2;
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this->cpu_state_.code_map [i] = p2;
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}
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void Cpu_map_code( struct Nes_Cpu* this, 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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int offset;
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for ( offset = 0; offset < size; offset += page_size )
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set_code_page( this, 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 Cpu_reset( struct Nes_Cpu* this, void const* unmapped_page )
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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->r.flags = irq_inhibit_mask;
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this->r.sp = 0xFF;
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this->r.pc = 0;
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this->r.a = 0;
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this->r.x = 0;
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this->r.y = 0;
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this->cpu_state_.time = 0;
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this->cpu_state_.base = 0;
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this->irq_time = future_time;
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this->end_time = future_time;
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set_code_page( this, page_count, unmapped_page );
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Cpu_map_code( this, 0, 0x10000, unmapped_page, page_size );
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blargg_verify_byte_order();
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}
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