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+#ifndef CYGONCE_KERNEL_KTYPES_H
+#define CYGONCE_KERNEL_KTYPES_H
+
+//==========================================================================
+//
+//	ktypes.h
+//
+//	Standard types used in the kernel and its interfaces
+//
+//==========================================================================
+//####COPYRIGHTBEGIN####
+//
+// -------------------------------------------
+// The contents of this file are subject to the Cygnus eCos Public License
+// Version 1.0 (the "License"); you may not use this file except in
+// compliance with the License.  You may obtain a copy of the License at
+// http://sourceware.cygnus.com/ecos
+// 
+// Software distributed under the License is distributed on an "AS IS"
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
+// License for the specific language governing rights and limitations under
+// the License.
+// 
+// The Original Code is eCos - Embedded Cygnus Operating System, released
+// September 30, 1998.
+// 
+// The Initial Developer of the Original Code is Cygnus.  Portions created
+// by Cygnus are Copyright (C) 1998 Cygnus Solutions.  All Rights Reserved.
+// -------------------------------------------
+//
+//####COPYRIGHTEND####
+//==========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):   nickg from an original by hmt
+// Contributors:  nickg
+// Date:        1997-09-08
+// Purpose:     Define kernel specific types
+// Description:	Kernel specific types
+// Usage:       #include <cyg/kernel/ktypes.h>
+//		...
+//		cyg_priority priority; // etc
+//		
+//####DESCRIPTIONEND####
+//
+//==========================================================================
+
+// -------------------------------------------------------------------------
+// Check that a configuration file is present.
+
+#ifndef CYGONCE_PKGCONF_KERNEL_H
+#error "No Configuration file included"
+#endif
+
+// -------------------------------------------------------------------------
+
+#include <cyg/infra/cyg_type.h>
+#include <stddef.h>              // for size_t
+
+// -------------------------------------------------------------------------
+// Integer types:
+
+typedef cyg_int32       cyg_code;       // General return/error/status code
+
+typedef cyg_count32     cyg_priority;   // priority value
+
+typedef cyg_uint32      cyg_vector;     // vector number/descriptor
+
+typedef cyg_uint64      cyg_tick_count; // clock tick count value
+
+// -------------------------------------------------------------------------
+// Predefinitions of various kernel classes
+
+#ifdef __cplusplus
+
+class Cyg_Scheduler;
+class Cyg_Scheduler_Implementation;
+
+class Cyg_HardwareThread;
+class Cyg_SchedThread;
+class Cyg_SchedThread_Implementation;
+class Cyg_Thread;
+
+class Cyg_ThreadQueue;
+class Cyg_ThreadQueue_Implementation;
+
+#endif
+
+
+// -------------------------------------------------------------------------
+// Class and structure conversion macros.
+// CYG_CLASSFROMFIELD translates a pointer to a field of a struct or
+// class into a pointer to the class.
+// CYG_OFFSETOFBASE yields the offset of a base class of a derived
+// class.
+// CYG_CLASSFROMBASE translates a pointer to a base class into a pointer
+// to a selected derived class. The base class object _must_ be part of
+// the specified derived class. This is essentially a poor mans version
+// of the RTTI dynamic_cast operator.
+// Caveat: These macros do not work for virtual base classes.
+
+#define CYG_CLASSFROMFIELD(_type_,_member_,_ptr_)\
+    ((_type_ *)((char *)(_ptr_)-((char *)&(((_type_ *)0)->_member_))))
+
+#ifdef __cplusplus
+
+#define CYG_OFFSETOFBASE(_type_,_base_)\
+    ((char *)((_base_ *)((_type_ *)4)) - (char *)4)
+
+# define CYG_CLASSFROMBASE(_class_,_base_,_ptr_)\
+    ((_class_ *)((char *)(_ptr_) - CYG_OFFSETOFBASE(_class_,_base_)))
+
+#endif
+
+// -------------------------------------------------------------------------
+#endif // CYGONCE_KERNEL_KTYPES_H
+// EOF ktypes.h
+