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diff --git a/sim/common/hw-instances.h b/sim/common/hw-instances.h
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+/*  This file is part of the program psim.
+
+    Copyright (C) 1994-1998, Andrew Cagney <cagney@highland.com.au>
+
+    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.
+
+    This program 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 General Public License for more details.
+ 
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ 
+    */
+
+
+#ifndef HW_INSTANCES_H
+#define HW_INSTANCES_H
+
+/* Instances:
+
+   As with IEEE1275, a device can be opened, creating an instance.
+   Instances provide more abstract interfaces to the underlying
+   hardware.  For example, the instance methods for a disk may include
+   code that is able to interpret file systems found on disks.  Such
+   methods would there for allow the manipulation of files on the
+   disks file system.  The operations would be implemented using the
+   basic block I/O model provided by the disk.
+
+   This model includes methods that faciliate the creation of device
+   instance and (should a given device support it) standard operations
+   on those instances.
+
+   */
+
+
+struct hw_instance;
+
+
+typedef void (hw_finish_instance_method)
+     (struct hw *hw,
+      struct hw_instance *);
+
+extern void set_hw_finish_instance
+(struct hw *hw,
+ hw_finish_instance_method *method);
+
+
+/* construct an instance of the hardware */
+
+struct hw_instance *hw_instance_create
+(struct hw *hw,
+ struct hw_instance *parent,
+ const char *path,
+ const char *args);
+
+struct hw_instance *hw_instance_interceed
+(struct hw_instance *parent,
+ const char *path,
+ const char *args);
+
+void hw_instance_delete
+(struct hw_instance *instance);
+
+
+/* methods applied to an instance of the hw */
+
+typedef int (hw_instance_read_method)
+     (struct hw_instance *instance,
+      void *addr,
+      unsigned_cell len);
+
+#define hw_instance_read(instance, addr, len) \
+((instance)->to_instance_read ((instance), (addr), (len)))
+
+#define set_hw_instance_read(instance, method) \
+((instance)->to_instance_read = (method))
+
+
+typedef int (hw_instance_write_method)
+     (struct hw_instance *instance,
+      const void *addr,
+      unsigned_cell len);
+
+#define hw_instance_write(instance, addr, len) \
+((instance)->to_instance_write ((instance), (addr), (len)))
+
+#define set_hw_instance_write(instance, method) \
+((instance)->to_instance_write = (method))
+
+
+typedef int (hw_instance_seek_method)
+     (struct hw_instance *instance,
+      unsigned_cell pos_hi,
+      unsigned_cell pos_lo);
+
+#define hw_instance_seek(instance, pos_hi, pos_lo) \
+((instance)->to_instance_seek ((instance), (pos_hi), (pos_lo)));
+
+#define set_hw_instance_seek(instance, method) \
+((instance)->to_instance_seek = (method))
+
+
+int hw_instance_call_method
+(struct hw_instance *instance,
+ const char *method,
+ int n_stack_args,
+ unsigned_cell stack_args[/*n_stack_args + 1(NULL)*/],
+ int n_stack_returns,
+ unsigned_cell stack_returns[/*n_stack_returns + 1(NULL)*/]);
+
+
+
+/* the definition of the instance */
+
+#define hw_instance_hw(instance) ((instance)->hw_of_instance + 0)
+
+#define hw_instance_path(instance) ((instance)->path_of_instance + 0)
+
+#define hw_instance_args(instance) ((instance)->args_of_instance)
+
+#define hw_instance_data(instance) ((instance)->data_of_instance)
+
+#define hw_instance_system(instance) (hw_system (hw_instance_hw (instance)))
+
+
+
+/* Finally an instance of a hardware device - keep your grubby little
+   mits off of these internals! :-) */
+
+struct hw_instance {
+
+  void *data_of_instance;
+  char *args_of_instance;
+  char *path_of_instance;
+
+  /* the device that owns the instance */
+  struct hw *hw_of_instance;
+  struct hw_instance *sibling_of_instance;
+
+  /* interposed instance */
+  struct hw_instance *parent_of_instance;
+  struct hw_instance *child_of_instance;
+
+  /* methods */
+  hw_instance_read_method *to_instance_read;
+  hw_instance_write_method *to_instance_write;
+  hw_instance_seek_method *to_instance_seek;
+
+};
+
+#endif