1 files changed, 82 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Gb_Cpu.h b/plugins/gme/game-music-emu-0.6pre/gme/Gb_Cpu.h
new file mode 100644
index 00000000..1aeccdfd
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+++ b/plugins/gme/game-music-emu-0.6pre/gme/Gb_Cpu.h
@@ -0,0 +1,82 @@
+// Nintendo Game Boy CPU emulator
+
+// Game_Music_Emu 0.6-pre
+#ifndef GB_CPU_H
+#define GB_CPU_H
+
+#include "blargg_common.h"
+
+class Gb_Cpu {
+public:
+	typedef int addr_t;
+	typedef BOOST::uint8_t byte;
+	
+	enum { mem_size = 0x10000 };
+	
+	// Clears registers and map all pages to unmapped
+	void reset( void* unmapped = NULL );
+	
+	// Maps code memory (memory accessed via the program counter). Start and size
+	// must be multiple of page_size.
+	enum { page_bits = 13 };
+	enum { page_size = 1 << page_bits };
+	void map_code( addr_t start, int size, void* code );
+	
+	// Accesses emulated memory as CPU does
+	byte* get_code( addr_t );
+	
+	// Game Boy Z-80 registers. NOT kept updated during emulation.
+	struct core_regs_t {
+		BOOST::uint16_t bc, de, hl, fa;
+	};
+	
+	struct registers_t : core_regs_t {
+		int pc; // more than 16 bits to allow overflow detection
+		BOOST::uint16_t sp;
+	};
+	registers_t r;
+	
+	// Base address for RST vectors, to simplify GBS player (normally 0)
+	addr_t rst_base;
+	
+	// Current time.
+	int time() const { return cpu_state->time; }
+	
+	// Changes time. Must not be called during emulation.
+	// Should be negative, because emulation stops once it becomes >= 0.
+	void set_time( int t ) { cpu_state->time = t; }
+	
+	// Emulator reads this many bytes past end of a page
+	enum { cpu_padding = 8 };
+
+	
+// Implementation
+public:
+	Gb_Cpu() : rst_base( 0 ) { cpu_state = &cpu_state_; }
+	enum { page_count = mem_size >> page_bits };
+	
+	struct cpu_state_t {
+		byte* code_map [page_count + 1];
+		int time;
+	};
+	cpu_state_t* cpu_state; // points to state_ or a local copy within run()
+	cpu_state_t cpu_state_;
+	
+private:
+	void set_code_page( int, void* );
+};
+
+#define GB_CPU_PAGE( addr ) ((unsigned) (addr) >> Gb_Cpu::page_bits)
+
+#if BLARGG_NONPORTABLE
+	#define GB_CPU_OFFSET( addr ) (addr)
+#else
+	#define GB_CPU_OFFSET( addr ) ((addr) & (Gb_Cpu::page_size - 1))
+#endif
+
+inline BOOST::uint8_t* Gb_Cpu::get_code( addr_t addr )
+{
+	return cpu_state_.code_map [GB_CPU_PAGE( addr )] + GB_CPU_OFFSET( addr );
+}
+
+#endif