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diff --git a/gdb/i386-nat.h b/gdb/i386-nat.h
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+/* Native-dependent code for the i386.
+
+   Low level functions to implement Oeprating System specific
+   code to manipulate I386 debug registers.
+
+   Copyright (C) 2009
+   Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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 3 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, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+
+#ifndef I386_NAT_H
+#define I386_NAT_H 1
+
+/* Hardware-assisted breakpoints and watchpoints.  */
+
+/* Add watchpoint methods to the provided target_ops.  
+   Targets using i386 family debug registers for watchpoints should call
+   this.  */
+struct target_ops;
+extern void i386_use_watchpoints (struct target_ops *);
+
+/* Support for hardware watchpoints and breakpoints using the i386
+   debug registers.
+
+   This provides several functions for inserting and removing
+   hardware-assisted breakpoints and watchpoints, testing if one or
+   more of the watchpoints triggered and at what address, checking
+   whether a given region can be watched, etc.
+
+   In addition, each target should provide several low-level functions
+   regrouped into i386_dr_low_type struct below. These functions
+   that will be called to insert watchpoints and hardware breakpoints
+   into the inferior, remove them, and check their status.  These
+   functions are:
+
+      set_control              -- set the debug control (DR7)
+				  register to a given value
+
+      set_addr                 -- put an address into one debug
+				  register
+
+      reset_addr               -- reset the address stored in
+				  one debug register
+
+      get_status               -- return the value of the debug
+				  status (DR6) register.
+
+   Additionally, the native file should set the debug_register_length
+   field to 4 or 8 depending on the number of bytes used for
+   deubg registers.  */
+
+struct i386_dr_low_type 
+  {
+    void (*set_control) (unsigned long);
+    void (*set_addr) (int, CORE_ADDR);
+    void (*reset_addr) (int);
+    unsigned long (*get_status) (void);
+    int debug_register_length;
+  };
+
+extern struct i386_dr_low_type i386_dr_low;
+
+/* Use this function to set i386_dr_low debug_register_length field
+   rather than setting it directly to check that the length is only
+   set once.  It also enables the 'maint set/show show-debug-regs' 
+   command.  */
+
+extern void i386_set_debug_register_length (int len);
+
+/* Use this function to reset the i386-nat.c debug register state.  */
+
+extern void i386_cleanup_dregs (void);
+
+#endif /* I386_NAT_H */