From acb0917556fc33681c1df5a530cf754193e67705 Mon Sep 17 00:00:00 2001 From: Andree Buschmann Date: Sun, 7 Aug 2011 20:01:04 +0000 Subject: Submit initial patch from FS#12176. Adds support for several new game music formats (AY, GBS, HES, KSS, SGC, VGM and VGZ) and replaces the current NSF and NSFE with a new implementation based on a port of the Game Music Emu library 'GME'. This first submit does not cover the full functionality provided by the author's original patch: Coleco-SGV is not supported, some GME-specific m3u-support has been removed and IRAM is not used yet. Further changes are very likely to follow this submit. Thanks to Mauricio Garrido. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30264 a1c6a512-1295-4272-9138-f99709370657 --- apps/codecs/libgme/z80_cpu.c | 85 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 apps/codecs/libgme/z80_cpu.c (limited to 'apps/codecs/libgme/z80_cpu.c') diff --git a/apps/codecs/libgme/z80_cpu.c b/apps/codecs/libgme/z80_cpu.c new file mode 100644 index 0000000000..9151350067 --- /dev/null +++ b/apps/codecs/libgme/z80_cpu.c @@ -0,0 +1,85 @@ +// Game_Music_Emu 0.6-pre. http://www.slack.net/~ant/ + +#include "z80_cpu.h" + +/* Copyright (C) 2006-2008 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" + +// flags, named with hex value for clarity +int const S80 = 0x80; +int const Z40 = 0x40; +int const F20 = 0x20; +int const H10 = 0x10; +int const F08 = 0x08; +int const V04 = 0x04; +int const P04 = 0x04; +int const N02 = 0x02; +int const C01 = 0x01; + +void Z80_init( struct Z80_Cpu* this ) +{ + this->cpu_state = &this->cpu_state_; + + int i; + for ( i = 0x100; --i >= 0; ) + { + int p, even = 1; + for ( p = i; p; p >>= 1 ) + even ^= p; + int n = (i & (S80 | F20 | F08)) | ((even & 1) * P04); + this->szpc [i] = n; + this->szpc [i + 0x100] = n | C01; + } + this->szpc [0x000] |= Z40; + this->szpc [0x100] |= Z40; +} + +inline void set_page( struct Z80_Cpu* this, int i, void* write, void const* read ) +{ + int offset = Z80_CPU_OFFSET( i * page_size ); + byte * write2 = STATIC_CAST(byte *,write) - offset; + byte const* read2 = STATIC_CAST(byte const*,read ) - offset; + this->cpu_state_.write [i] = write2; + this->cpu_state_.read [i] = read2; + this->cpu_state->write [i] = write2; + this->cpu_state->read [i] = read2; +} + +void Z80_reset( struct Z80_Cpu* this, void* unmapped_write, void const* unmapped_read ) +{ + check( this->cpu_state == &this->cpu_state_ ); + this->cpu_state = &this->cpu_state_; + this->cpu_state_.time = 0; + this->cpu_state_.base = 0; + this->end_time_ = 0; + + int i; + for ( i = 0; i < page_count + 1; i++ ) + set_page( this, i, unmapped_write, unmapped_read ); + + memset( &this->r, 0, sizeof this->r ); +} + +void Z80_map_mem( struct Z80_Cpu* this, addr_t start, int size, void* write, void const* read ) +{ + // address range must begin and end on page boundaries + require( start % page_size == 0 ); + require( size % page_size == 0 ); + require( start + size <= 0x10000 ); + + int offset; + for ( offset = 0; offset < size; offset += page_size ) + set_page( this, (start + offset) >> page_bits, + STATIC_CAST(char *,write) + offset, + STATIC_CAST(char const*,read ) + offset ); +} -- cgit v1.2.3