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diff --git a/sim/common/hw-device.h b/sim/common/hw-device.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_DEVICE_H
+#define HW_DEVICE_H
+
+/* declared in sim-basics.h, this object is used everywhere */
+/* typedef struct _device device; */
+
+
+/* Introduction:
+
+   As explained in earlier sections, the device, device instance,
+   property and ports lie at the heart of PSIM's device model.
+
+   In the below a synopsis of the device object and the operations it
+   supports are given.
+   */
+
+
+/* Creation:
+
+   The devices are created using a sequence of steps.  In particular:
+
+	o	A tree framework is created.
+
+		At this point, properties can be modified and extra
+		devices inserted (or removed?).
+
+#if LATER
+
+		Any properties that have a run-time value (eg ihandle
+		or device instance pointer properties) are entered
+		into the device tree using a named reference to the
+		corresponding runtime object that is to be created.
+
+#endif
+
+	o	Real devices are created for all the dummy devices.
+
+		A device can assume that all of its parents have been
+		initialized.
+
+		A device can assume that all non run-time properties
+		have been initialized.
+
+		As part of being created, the device normally attaches
+		itself to its parent bus.
+
+#if LATER
+
+		Device instance data is initialized.
+
+#endif
+
+#if LATER
+
+	o	Any run-time properties are created.
+
+#endif
+
+#if MUCH_MUCH_LATER
+
+	o	Some devices, as part of their initialization
+		might want to refer to ihandle properties
+		in the device tree.
+
+#endif
+
+   NOTES:
+
+	o	It is important to separate the creation
+		of an actual device from the creation
+		of the tree.  The alternative creating
+		the device in two stages: As a separate
+		entity and then as a part of the tree.
+
+#if LATER
+	o	Run-time properties can not be created
+		until after the devices in the tree
+		have been created.  Hence an extra pass
+		for handling them.
+#endif
+
+   */
+
+/* Relationships:
+
+   A device is able to determine its relationship to other devices
+   within the tree.  Operations include querying for a devices parent,
+   sibling, child, name, and path (from the root).
+
+   */
+
+
+#define hw_parent(hw) ((hw)->parent_of_hw + 0)
+
+#define hw_sibling(hw) ((hw)->sibling_of_hw + 0)
+
+#define hw_child(hw) ((hw)->child_of_hw + 0)
+
+
+
+/* Herritage:
+
+ */
+
+#define hw_family(hw) ((hw)->family_of_hw + 0)
+
+#define hw_name(hw) ((hw)->name_of_hw + 0)
+
+#define hw_args(hw) ((hw)->args_of_hw + 0)
+
+#define hw_path(hw) ((hw)->path_of_hw + 0)
+
+
+
+/* Short cut to the root node of the tree */
+
+#define hw_root(hw) ((hw)->root_of_hw + 0)
+
+/* Short cut back to the simulator object */
+
+#define hw_system(hw) ((hw)->system_of_hw)
+
+/* For requests initiated by a CPU the cpu that initiated the request */
+
+struct _sim_cpu *hw_system_cpu (struct hw *hw);
+
+
+/* Device private data */
+
+#define hw_data(hw) ((hw)->data_of_hw)
+
+#define set_hw_data(hw, value) \
+((hw)->data_of_hw = (value))
+
+
+
+/* Perform a soft reset of the device */
+
+typedef unsigned (hw_reset_method)
+     (struct hw *me);
+
+#define hw_reset(hw) ((hw)->to_reset (hw))
+
+#define set_hw_reset(hw, method) \
+((hw)->to_reset = method)
+
+
+/* Hardware operations:
+
+   Connecting a parent to its children is a common bus. The parent
+   node is described as the bus owner and is responisble for
+   co-ordinating bus operations. On the bus, a SPACE:ADDR pair is used
+   to specify an address.  A device that is both a bus owner (parent)
+   and bus client (child) are refered to as a bridging device.
+
+   A child performing a data (DMA) transfer will pass its request to
+   the bus owner (the devices parent).  The bus owner will then either
+   reflect the request to one of the other devices attached to the bus
+   (a child of the bus owner) or bridge the request up the tree to the
+   next bus. */
+
+
+/* Children attached to a bus can register (attach) themselves to
+   specific addresses on their attached bus.
+
+   (A device may also be implicitly attached to certain bus
+   addresses).
+
+   The SPACE:ADDR pair specify an address on the common bus that
+   connects the parent and child devices. */
+
+typedef void (hw_attach_address_method)
+     (struct hw *me,
+      int level,
+      int space,
+      address_word addr,
+      address_word nr_bytes,
+      struct hw *client); /*callback/default*/
+
+#define hw_attach_address(me, level, space, addr, nr_bytes, client) \
+((me)->to_attach_address (me, level, space, addr, nr_bytes, client))
+
+#define set_hw_attach_address(hw, method) \
+((hw)->to_attach_address = (method))
+
+typedef void (hw_detach_address_method)
+     (struct hw *me,
+      int level,
+      int space,
+      address_word addr,
+      address_word nr_bytes,
+      struct hw *client); /*callback/default*/
+
+#define hw_detach_address(me, level, space, addr, nr_bytes, client) \
+((me)->to_detach_address (me, level, space, addr, nr_bytes, client))
+
+#define set_hw_detach_address(hw, method) \
+((hw)->to_detach_address = (method))
+
+
+/* An IO operation from a parent to a child via the conecting bus.
+
+   The SPACE:ADDR pair specify an address on the bus shared between
+   the parent and child devices. */
+
+typedef unsigned (hw_io_read_buffer_method)
+     (struct hw *me,
+      void *dest,
+      int space,
+      unsigned_word addr,
+      unsigned nr_bytes);
+
+#define hw_io_read_buffer(hw, dest, space, addr, nr_bytes) \
+((hw)->to_io_read_buffer (hw, dest, space, addr, nr_bytes))
+
+#define set_hw_io_read_buffer(hw, method) \
+((hw)->to_io_read_buffer = (method))
+
+typedef unsigned (hw_io_write_buffer_method)
+     (struct hw *me,
+      const void *source,
+      int space,
+      unsigned_word addr,
+      unsigned nr_bytes);
+
+#define hw_io_write_buffer(hw, src, space, addr, nr_bytes) \
+((hw)->to_io_write_buffer (hw, src, space, addr, nr_bytes))
+
+#define set_hw_io_write_buffer(hw, method) \
+((hw)->to_io_write_buffer = (method))
+
+
+/* Conversly, the device pci1000,1@1 may need to perform a dma transfer
+   into the cpu/memory core.  Just as I/O moves towards the leaves,
+   dma transfers move towards the core via the initiating devices
+   parent nodes.  The root device (special) converts the DMA transfer
+   into reads/writes to memory.
+
+   The SPACE:ADDR pair specify an address on the common bus connecting
+   the parent and child devices. */
+
+typedef unsigned (hw_dma_read_buffer_method)
+     (struct hw *bus,
+      void *dest,
+      int space,
+      unsigned_word addr,
+      unsigned nr_bytes);
+
+#define hw_dma_read_buffer(bus, dest, space, addr, nr_bytes) \
+((bus)->to_dma_read_buffer (bus, dest, space, addr, nr_bytes))
+
+#define set_hw_dma_read_buffer(me, method) \
+((me)->to_dma_read_buffer = (method))
+
+typedef unsigned (hw_dma_write_buffer_method)
+     (struct hw *bus,
+      const void *source,
+      int space,
+      unsigned_word addr,
+      unsigned nr_bytes,
+      int violate_read_only_section);
+
+#define hw_dma_write_buffer(bus, src, space, addr, nr_bytes, violate_ro) \
+((bus)->to_dma_write_buffer (bus, src, space, addr, nr_bytes, violate_ro))
+
+#define set_hw_dma_write_buffer(me, method) \
+((me)->to_dma_write_buffer = (method))
+
+/* Address/size specs for devices are encoded following a convention
+   similar to that used by OpenFirmware.  In particular, an
+   address/size is packed into a sequence of up to four cell words.
+   The number of words determined by the number of {address,size}
+   cells attributes of the device. */
+
+typedef struct _hw_unit {
+  int nr_cells;
+  unsigned_cell cells[4]; /* unused cells are zero */
+} hw_unit;
+
+
+/* For the given bus, the number of address and size cells used in a
+   hw_unit. */
+
+#define hw_unit_nr_address_cells(bus) ((bus)->nr_address_cells_of_hw_unit + 0)
+
+#define hw_unit_nr_size_cells(bus) ((bus)->nr_size_cells_of_hw_unit + 0)
+
+
+/* For the given device, its identifying hw_unit address.
+
+   Each device has an identifying hw_unit address.  That address is
+   used when identifying one of a number of identical devices on a
+   common controller bus. ex fd0&fd1. */
+
+const hw_unit *hw_unit_address
+(struct hw *me);
+
+
+/* Convert between a textual and the internal representation of a
+   hw_unit address/size.
+
+   NOTE: A device asks its parent to translate between a hw_unit and
+   textual representation.  This is because the textual address of a
+   device is specified using the parent busses notation. */
+
+typedef int (hw_unit_decode_method)
+     (struct hw *bus,
+      const char *encoded,
+      hw_unit *unit);
+
+#define hw_unit_decode(bus, encoded, unit) \
+((bus)->to_unit_decode (bus, encoded, unit))
+
+#define set_hw_unit_decode(hw, method) \
+((hw)->to_unit_decode = (method))
+
+typedef int (hw_unit_encode_method)
+     (struct hw *bus,
+      const hw_unit *unit,
+      char *encoded,
+      int sizeof_buf);
+     
+#define hw_unit_encode(bus, unit, encoded, sizeof_encoded) \
+((bus)->to_unit_encode (bus, unit, encoded, sizeof_encoded))
+
+#define set_hw_unit_encode(hw, method) \
+((hw)->to_unit_encode = (method))
+
+
+/* As the bus that the device is attached too, to translate a devices
+   hw_unit address/size into a form suitable for an attach address
+   call.
+
+   Return a zero result if the address should be ignored when looking
+   for attach addresses. */
+
+typedef int (hw_unit_address_to_attach_address_method)
+     (struct hw *bus,
+      const hw_unit *unit_addr,
+      int *attach_space,
+      unsigned_word *attach_addr,
+      struct hw *client);
+
+#define hw_unit_address_to_attach_address(bus, unit_addr, attach_space, attach_addr, client) \
+((bus)->to_unit_address_to_attach_address (bus, unit_addr, attach_space, attach_addr, client))
+
+#define set_hw_unit_address_to_attach_address(hw, method) \
+((hw)->to_unit_address_to_attach_address = (method))
+
+typedef int (hw_unit_size_to_attach_size_method)
+     (struct hw *bus,
+      const hw_unit *unit_size,
+      unsigned *attach_size,
+      struct hw *client);
+
+#define hw_unit_size_to_attach_size(bus, unit_size, attach_size, client) \
+((bus)->to_unit_size_to_attach_size (bus, unit_size, attach_size, client))
+
+#define set_hw_unit_size_to_attach_size(hw, method) \
+((hw)->to_unit_size_to_attach_size = (method))
+
+
+extern char *hw_strdup (struct hw *me, const char *str);
+
+
+/* Utilities:
+
+   */
+
+/* IOCTL::
+
+   Often devices require `out of band' operations to be performed.
+   For instance a pal device may need to notify a PCI bridge device
+   that an interrupt ack cycle needs to be performed on the PCI bus.
+   Within PSIM such operations are performed by using the generic
+   ioctl call <<hw_ioctl()>>.
+
+   */
+
+typedef enum {
+  hw_ioctl_break, /* unsigned_word requested_break */
+  hw_ioctl_set_trace, /* void */
+  hw_ioctl_create_stack, /* unsigned_word *sp, char **argv, char **envp */
+  hw_ioctl_change_media, /* const char *new_image (possibly NULL) */
+  nr_hw_ioctl_requests,
+} hw_ioctl_request;
+
+typedef int (hw_ioctl_method)
+     (struct hw *me,
+      hw_ioctl_request request,
+      va_list ap);
+
+int hw_ioctl
+(struct hw *me,
+ hw_ioctl_request request,
+ ...);
+
+
+/* Error reporting::
+
+   So that errors originating from devices appear in a consistent
+   format, the <<hw_abort()>> function can be used.  Formats and
+   outputs the error message before aborting the simulation
+
+   Devices should use this function to abort the simulation except
+   when the abort reason leaves the simulation in a hazardous
+   condition (for instance a failed malloc).
+
+   */
+
+void hw_abort
+(struct hw *me,
+ const char *fmt,
+ ...) __attribute__ ((format (printf, 2, 3)));
+
+void hw_vabort
+(struct hw *me,
+ const char *fmt,
+ va_list ap);
+
+void hw_halt
+(struct hw *me,
+ int reason,
+ int status);
+
+
+#define hw_trace_p(hw) ((hw)->trace_of_hw_p + 0)
+
+void hw_trace
+(struct hw *me,
+ const char *fmt,
+ ...) __attribute__ ((format (printf, 2, 3)));
+
+#define HW_TRACE(ARGS) \
+do { \
+  if (hw_trace_p (me)) \
+    { \
+      hw_trace ARGS; \
+    } \
+} while (0)
+
+
+/* Some of the related functions require specific types */
+
+struct hw_property_data;
+struct hw_port_data;
+struct hw_base_data;
+struct hw_alloc_data;
+struct hw_event_data;
+struct hw_handle_data;
+struct hw_instance_data;
+
+/* Finally the hardware device - keep your grubby little mits off of
+   these internals! :-) */
+
+struct hw {
+
+  /* our relatives */
+  struct hw *parent_of_hw;
+  struct hw *sibling_of_hw;
+  struct hw *child_of_hw;
+
+  /* our identity */
+  const char *name_of_hw;
+  const char *family_of_hw;
+  const char *args_of_hw;
+  const char *path_of_hw;
+
+  /* our data */
+  void *data_of_hw;
+
+  /* hot links */
+  struct hw *root_of_hw;
+  struct sim_state *system_of_hw;
+
+  /* identifying data */
+  hw_unit unit_address_of_hw;
+  int nr_address_cells_of_hw_unit;
+  int nr_size_cells_of_hw_unit;
+
+  /* Soft reset */
+  hw_reset_method *to_reset;
+
+  /* Basic callbacks */
+  hw_io_read_buffer_method *to_io_read_buffer;
+  hw_io_write_buffer_method *to_io_write_buffer;
+  hw_dma_read_buffer_method *to_dma_read_buffer;
+  hw_dma_write_buffer_method *to_dma_write_buffer;
+  hw_attach_address_method *to_attach_address;
+  hw_detach_address_method *to_detach_address;
+
+  /* More complicated callbacks */
+  hw_ioctl_method *to_ioctl;
+  int trace_of_hw_p;
+
+  /* address callbacks */
+  hw_unit_decode_method *to_unit_decode;
+  hw_unit_encode_method *to_unit_encode;
+  hw_unit_address_to_attach_address_method *to_unit_address_to_attach_address;
+  hw_unit_size_to_attach_size_method *to_unit_size_to_attach_size;
+
+  /* related data */
+  struct hw_property_data *properties_of_hw;
+  struct hw_port_data *ports_of_hw;
+  struct hw_base_data *base_of_hw;
+  struct hw_alloc_data *alloc_of_hw;
+  struct hw_event_data *events_of_hw;
+  struct hw_handle_data *handles_of_hw;
+  struct hw_instance_data *instances_of_hw;
+
+};
+
+
+#endif