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/gbs_cpu.c | 120 ++++++++++++++++++++++++++++++++++++ 1 file changed, 120 insertions(+) create mode 100644 lib/rbcodec/codecs/libgme/gbs_cpu.c (limited to 'lib/rbcodec/codecs/libgme/gbs_cpu.c') diff --git a/lib/rbcodec/codecs/libgme/gbs_cpu.c b/lib/rbcodec/codecs/libgme/gbs_cpu.c new file mode 100644 index 0000000000..1015dd5358 --- /dev/null +++ b/lib/rbcodec/codecs/libgme/gbs_cpu.c @@ -0,0 +1,120 @@ +// Game_Music_Emu 0.6-pre. http://www.slack.net/~ant/ + +#include "gbs_emu.h" +#include "blargg_endian.h" + +/* Copyright (C) 2003-2009 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" + +#ifndef LOG_MEM + #define LOG_MEM( addr, str, data ) data +#endif + +int read_mem( struct Gbs_Emu* this, addr_t addr ) +{ + int result = *Cpu_get_code( &this->cpu, addr ); + if ( (unsigned) (addr - io_addr) < io_size ) + result = Apu_read_register( &this->apu, Time( this ), addr ); + + return LOG_MEM( addr, ">", result ); +} + +static inline void write_io_inline( struct Gbs_Emu* this, int offset, int data, int base ) +{ + if ( (unsigned) (offset - (io_addr - base)) < io_size ) + Apu_write_register( &this->apu, Time( this ), offset + base, data & 0xFF ); + else if ( (unsigned) (offset - (0xFF06 - base)) < 2 ) + update_timer( this ); + else if ( offset == io_base - base ) + this->ram [base - ram_addr + offset] = 0; // keep joypad return value 0 + else + this->ram [base - ram_addr + offset] = 0xFF; +} + +void write_mem( struct Gbs_Emu* this, addr_t addr, int data ) +{ + (void) LOG_MEM( addr, "<", data ); + + int offset = addr - ram_addr; + if ( (unsigned) offset < 0x10000 - ram_addr ) + { + this->ram [offset] = data; + + offset -= 0xE000 - ram_addr; + if ( (unsigned) offset < 0x1F80 ) + write_io_inline( this, offset, data, 0xE000 ); + } + else if ( (unsigned) (offset - (0x2000 - ram_addr)) < 0x2000 ) + { + set_bank( this, data & 0xFF ); + } +#ifndef NDEBUG + else if ( unsigned (addr - 0x8000) < 0x2000 || unsigned (addr - 0xE000) < 0x1F00 ) + { + /* dprintf( "Unmapped write $%04X\n", (unsigned) addr ); */ + } +#endif +} + +static void write_io_( struct Gbs_Emu* this, int offset, int data ) +{ + write_io_inline( this, offset, data, io_base ); +} + +static inline void write_io( struct Gbs_Emu* this, int offset, int data ) +{ + (void) LOG_MEM( offset + io_base, "<", data ); + + this->ram [io_base - ram_addr + offset] = data; + if ( (unsigned) offset < 0x80 ) + write_io_( this, offset, data ); +} + +static int read_io( struct Gbs_Emu* this, int offset ) +{ + int const io_base = 0xFF00; + int result = this->ram [io_base - ram_addr + offset]; + + if ( (unsigned) (offset - (io_addr - io_base)) < io_size ) + { + result = Apu_read_register( &this->apu, Time( this ), offset + io_base ); + (void) LOG_MEM( offset + io_base, ">", result ); + } + else + { + check( result == read_mem( offset + io_base ) ); + } + return result; +} + +#define READ_FAST( emu, addr, out ) \ +{\ + out = READ_CODE( addr );\ + if ( (unsigned) (addr - io_addr) < io_size )\ + out = LOG_MEM( addr, ">", Apu_read_register( &emu->apu, TIME() + emu->end_time, addr ) );\ + else\ + check( out == Read_mem( emu, addr ) );\ +} + +#define READ_MEM( emu, addr ) read_mem( emu, addr ) +#define WRITE_MEM( emu, addr, data ) write_mem( emu, addr, data ) + +#define WRITE_IO( emu, addr, data ) write_io( emu, addr, data ) +#define READ_IO( emu, addr, out ) out = read_io( emu, addr ) + +#define CPU_BEGIN \ +void run_cpu( struct Gbs_Emu* this )\ +{ \ + struct Gb_Cpu* cpu = &this->cpu; + #include "gb_cpu_run.h" +} -- cgit v1.2.3