/* -*- mode: C++; tab-width: 4 -*- */
/* ===================================================================== *\
	Copyright (c) 1998-2001 Palm, Inc. or its subsidiaries.
	All rights reserved.

	This file is part of the Palm OS Emulator.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.
\* ===================================================================== */

#ifndef EmCPU_h
#define EmCPU_h

class EmSession;
class SessionFile;

class EmCPU;
extern EmCPU*	gCPU;

class EmCPU
{
	public:
		// -----------------------------------------------------------------------------
		// constructor / destructor
		// -----------------------------------------------------------------------------

								EmCPU 				(EmSession*);
		virtual 				~EmCPU				(void);

		// -----------------------------------------------------------------------------
		// public methods
		// -----------------------------------------------------------------------------

		// Standard sub-system methods:
		//		Reset:	Resets the state.  Called on hardware resets or on
		//				calls to SysReset.  Also called from constructor.
		//		Save:	Saves the state to the given file.
		//		Load:	Loads the state from the given file.  Can assume that
		//				Reset has been called first.

		virtual void 			Reset				(Bool hardwareReset);
		virtual void 			Save				(SessionFile&);
		virtual void 			Load				(SessionFile&);

		// Execute the main CPU loop until asked to stop.

		virtual void 			Execute 			(void) = 0;
		virtual void 			CheckAfterCycle		(void) = 0;

		// Low-level access to CPU state.

		virtual emuptr			GetPC				(void) = 0;
		virtual emuptr			GetSP				(void) = 0;
		virtual uint32			GetRegister			(int) = 0;

		virtual void			SetPC				(emuptr) = 0;
		virtual void			SetSP				(emuptr) = 0;
		virtual void			SetRegister			(int, uint32) = 0;

		virtual Bool			Stopped				(void) = 0;

	protected:
		EmSession*				fSession;
};

#endif /* EmCPU_h */