From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001
From: Sean Bartell <wingedtachikoma@gmail.com>
Date: Sat, 25 Jun 2011 21:32:25 -0400
Subject: Add codecs to librbcodec.
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Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
---
 lib/rbcodec/codecs/libgme/nsf_cpu.c | 115 ++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 lib/rbcodec/codecs/libgme/nsf_cpu.c

(limited to 'lib/rbcodec/codecs/libgme/nsf_cpu.c')

diff --git a/lib/rbcodec/codecs/libgme/nsf_cpu.c b/lib/rbcodec/codecs/libgme/nsf_cpu.c
new file mode 100644
index 0000000000..1f44bd3c3c
--- /dev/null
+++ b/lib/rbcodec/codecs/libgme/nsf_cpu.c
@@ -0,0 +1,115 @@
+// Normal cpu for NSF emulator
+
+// Game_Music_Emu 0.6-pre. http://www.slack.net/~ant/
+
+#include "nsf_emu.h"
+
+#include "blargg_endian.h"
+
+#ifdef BLARGG_DEBUG_H
+	//#define CPU_LOG_START 1000000
+	//#include "nes_cpu_log.h"
+	#undef LOG_MEM
+#endif
+
+/* 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"
+
+#ifndef LOG_MEM
+	#define LOG_MEM( addr, str, data ) data
+#endif
+
+int read_mem( struct Nsf_Emu* this, addr_t addr )
+{
+	int result = this->low_ram [addr & (low_ram_size-1)]; // also handles wrap-around
+	if ( addr & 0xE000 )
+	{
+		result = *Cpu_get_code( &this->cpu, addr );
+		if ( addr < sram_addr )
+		{
+			if ( addr == apu_status_addr )
+				result = Apu_read_status( &this->apu, Cpu_time( &this->cpu ) );
+			else
+				result = cpu_read( this, addr );
+		}
+	}
+	return LOG_MEM( addr, ">", result );
+}
+
+void write_mem( struct Nsf_Emu* this, addr_t addr, int data )
+{
+	(void) LOG_MEM( addr, "<", data );
+	
+	int offset = addr - sram_addr;
+	if ( (unsigned) offset < sram_size )
+	{
+		sram( this ) [offset] = data;
+	}
+	else
+	{
+		// after sram because cpu handles most low_ram accesses internally already
+		int temp = addr & (low_ram_size-1); // also handles wrap-around
+		if ( !(addr & 0xE000) )
+		{
+			this->low_ram [temp] = data;
+		}
+		else
+		{
+			int bank = addr - banks_addr;
+			if ( (unsigned) bank < bank_count )
+			{
+				write_bank( this, bank, data );
+			}
+			else if ( (unsigned) (addr - apu_io_addr) < apu_io_size )
+			{
+				Apu_write_register( &this->apu, Cpu_time( &this->cpu ), addr, data );
+			}
+			else
+			{
+			#ifndef NSF_EMU_APU_ONLY
+				// 0x8000-0xDFFF is writable
+				int i = addr - 0x8000;
+				if ( fds_enabled( this ) && (unsigned) i < fdsram_size )
+					fdsram( this ) [i] = data;
+				else
+			#endif
+				cpu_write( this, addr, data );
+			}
+		}
+	}
+}
+
+#define READ_LOW(  addr       ) (LOG_MEM( addr, ">", this->low_ram [addr] ))
+#define WRITE_LOW( addr, data ) (LOG_MEM( addr, "<", this->low_ram [addr] = data ))
+
+#define CAN_WRITE_FAST( addr )  (addr < low_ram_size)
+#define WRITE_FAST              WRITE_LOW
+
+// addr < 0x2000 || addr >= 0x8000
+#define CAN_READ_FAST( addr )   ((addr ^ 0x8000) < 0xA000)
+#define READ_FAST( addr, out  ) (LOG_MEM( addr, ">", out = READ_CODE( addr ) ))
+
+#define READ_MEM(  addr       ) read_mem(  this, addr )
+#define WRITE_MEM( addr, data ) write_mem( this, addr, data )
+
+#define CPU_BEGIN \
+bool run_cpu_until( struct Nsf_Emu* this, nes_time_t end ) \
+{ \
+	struct Nes_Cpu* cpu = &this->cpu; \
+	Cpu_set_end_time( cpu, end ); \
+	if ( *Cpu_get_code( cpu, cpu->r.pc ) != halt_opcode ) \
+	{
+		#include "nes_cpu_run.h"
+	}
+	return Cpu_time_past_end( cpu ) < 0;
+}
-- 
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