new file mode 100644
--- /dev/null
+++ b/packages/hal/mips/sim/current/include/hal_diag.h
@@ -0,0 +1,114 @@
+#ifndef CYGONCE_HAL_HAL_DIAG_H
+#define CYGONCE_HAL_HAL_DIAG_H
+
+/*=============================================================================
+//
+//	hal_diag.h
+//
+//	HAL Support for Kernel Diagnostic Routines
+//
+//=============================================================================
+//####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
+// Contributors:	nickg
+// Date:	1998-03-02
+// Purpose:	HAL Support for Kernel Diagnostic Routines
+// Description:	Diagnostic routines for use during kernel development.
+// Usage:	#include <cyg/hal/hal_diag.h>
+//
+//####DESCRIPTIONEND####
+//
+//===========================================================================*/
+
+#include <pkgconf/hal.h>
+
+#include <cyg/infra/cyg_type.h>
+
+/*---------------------------------------------------------------------------*/
+
+#define CYG_DIAG_USE_PAL
+
+/*---------------------------------------------------------------------------*/
+
+#ifdef CYG_DIAG_USE_PAL
+
+/*---------------------------------------------------------------------------*/
+/* Register addresses                                                        */
+  
+#define PAL_RESET        0x00
+#define PAL_CPU_NR       0x04
+#define PAL_INT          0x08
+#define PAL_NR_CPU       0x0a
+
+#define PAL_READ_FIFO    0x10
+#define PAL_READ_STATUS  0x14
+#define PAL_WRITE_FIFO   0x18
+#define PAL_WRITE_STATUS 0x1a
+
+#define OEA_DEV          0xFFFF0000
+
+/*---------------------------------------------------------------------------*/
+
+#define HAL_DIAG_INIT()
+
+#define HAL_DIAG_WRITE_CHAR(_c_)                        \
+{                                                       \
+    volatile unsigned char *tty_buffer =                \
+        (unsigned char*)(OEA_DEV + PAL_WRITE_FIFO);     \
+    volatile unsigned char *tty_status =                \
+        (unsigned char*)(OEA_DEV + PAL_WRITE_STATUS);   \
+    if( _c_ != '\r' )                                   \
+    {                                                   \
+        while( *tty_status == 0 ) continue;             \
+        *tty_buffer = _c_;                              \
+    }                                                   \
+}
+
+#define HAL_DIAG_READ_CHAR(_c_)                         \
+{                                                       \
+    volatile unsigned char *tty_buffer =                \
+        (unsigned char*)(OEA_DEV + PAL_READ_FIFO);      \
+    volatile unsigned char *tty_status =                \
+        (unsigned char*)(OEA_DEV + PAL_READ_STATUS);    \
+    while( *tty_status == 0 ) continue;                 \
+    _c_ = *tty_buffer;                                  \
+}
+
+#else
+/*---------------------------------------------------------------------------*/
+/* There is no diagnostic output on MIPS simulator                           */
+
+#define HAL_DIAG_INIT()
+
+#define HAL_DIAG_WRITE_CHAR(_c_)
+
+#define HAL_DIAG_READ_CHAR(_c_) (_c_) = 0
+
+#endif
+
+/*---------------------------------------------------------------------------*/
+/* end of hal_diag.h                                                         */
+#endif /* CYGONCE_HAL_HAL_DIAG_H */