From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001 From: Sean Bartell Date: Sat, 25 Jun 2011 21:32:25 -0400 Subject: Add codecs to librbcodec. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius Tested-by: Nils Wallménius --- lib/rbcodec/codecs/libgme/nes_cpu.c | 62 +++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 lib/rbcodec/codecs/libgme/nes_cpu.c (limited to 'lib/rbcodec/codecs/libgme/nes_cpu.c') diff --git a/lib/rbcodec/codecs/libgme/nes_cpu.c b/lib/rbcodec/codecs/libgme/nes_cpu.c new file mode 100644 index 0000000000..20925918c2 --- /dev/null +++ b/lib/rbcodec/codecs/libgme/nes_cpu.c @@ -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" + +static inline void set_code_page( struct Nes_Cpu* this, int i, void const* p ) +{ + byte const* p2 = STATIC_CAST(byte const*,p) - NES_CPU_OFFSET( i * page_size ); + this->cpu_state->code_map [i] = p2; + this->cpu_state_.code_map [i] = p2; +} + +void Cpu_map_code( struct Nes_Cpu* this, 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 ); + + int offset; + for ( offset = 0; offset < size; offset += page_size ) + set_code_page( this, NES_CPU_PAGE( start + offset ), + STATIC_CAST(char const*,data) + (offset & ((unsigned) mirror_size - 1)) ); +} + +void Cpu_reset( struct Nes_Cpu* this, void const* unmapped_page ) +{ + check( this->cpu_state == &this->cpu_state_ ); + this->cpu_state = &this->cpu_state_; + + this->r.flags = irq_inhibit_mask; + this->r.sp = 0xFF; + this->r.pc = 0; + this->r.a = 0; + this->r.x = 0; + this->r.y = 0; + + this->cpu_state_.time = 0; + this->cpu_state_.base = 0; + this->irq_time = future_time; + this->end_time = future_time; + + set_code_page( this, page_count, unmapped_page ); + Cpu_map_code( this, 0, 0x10000, unmapped_page, page_size ); + + blargg_verify_byte_order(); +} -- cgit v1.2.3