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------------------------------------------------------------------------------

--                                                                          --

--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --

--                                                                          --

--                         A D A . I N T E R R U P T S                      --

--                                                                          --

--                                  B o d y                                 --

--                                                                          --

--             Copyright (C) 1991-1994, Florida State University            --

--                     Copyright (C) 1995-2005, AdaCore                     --

--                                                                          --

-- GNARL is free software; you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 2,  or (at your option) any later ver- --

-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --

-- OUT 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  distributed with GNARL; see file COPYING.  If not, write --

-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, USA.                                              --

--                                                                          --

-- As a special exception,  if other files  instantiate  generics from this --

-- unit, or you link  this unit with other files  to produce an executable, --

-- this  unit  does not  by itself cause  the resulting  executable  to  be --

-- covered  by the  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNARL was developed by the GNARL team at Florida State University.       --

-- Extensive contributions were provided by Ada Core Technologies, Inc.     --

--                                                                          --

------------------------------------------------------------------------------

with System.Interrupts;

--  used for Interrupt_ID

--           Parameterless_Handler

--           Is_Reserved

--           Is_Handler_Attached

--           Current_Handler

--           Attach_Handler

--           Exchange_Handler

--           Detach_Handler

--           Reference

with Unchecked_Conversion;

package body Ada.Interrupts is

   package SI renames System.Interrupts;

   function To_System is new Unchecked_Conversion

     (Parameterless_Handler, SI.Parameterless_Handler);

   function To_Ada is new Unchecked_Conversion

     (SI.Parameterless_Handler, Parameterless_Handler);

   --------------------

   -- Attach_Handler --

   --------------------

   procedure Attach_Handler

     (New_Handler : Parameterless_Handler;

      Interrupt   : Interrupt_ID)

   is

   begin

      SI.Attach_Handler

        (To_System (New_Handler), SI.Interrupt_ID (Interrupt), False);

   end Attach_Handler;

   ---------------------

   -- Current_Handler --

   ---------------------

   function Current_Handler

     (Interrupt : Interrupt_ID) return Parameterless_Handler

   is

   begin

      return To_Ada (SI.Current_Handler (SI.Interrupt_ID (Interrupt)));

   end Current_Handler;

   --------------------

   -- Detach_Handler --

   --------------------

   procedure Detach_Handler (Interrupt : Interrupt_ID) is

   begin

      SI.Detach_Handler (SI.Interrupt_ID (Interrupt), False);

   end Detach_Handler;

   ----------------------

   -- Exchange_Handler --

   ----------------------

   procedure Exchange_Handler

     (Old_Handler : out Parameterless_Handler;

      New_Handler : Parameterless_Handler;

      Interrupt   : Interrupt_ID)

   is

      H : SI.Parameterless_Handler;

   begin

      SI.Exchange_Handler

        (H, To_System (New_Handler),

         SI.Interrupt_ID (Interrupt), False);

      Old_Handler := To_Ada (H);

   end Exchange_Handler;

   -----------------

   -- Is_Attached --

   -----------------

   function Is_Attached (Interrupt : Interrupt_ID) return Boolean is

   begin

      return SI.Is_Handler_Attached (SI.Interrupt_ID (Interrupt));

   end Is_Attached;

   -----------------

   -- Is_Reserved --

   -----------------

   function Is_Reserved (Interrupt : Interrupt_ID) return Boolean is

   begin

      return SI.Is_Reserved (SI.Interrupt_ID (Interrupt));

   end Is_Reserved;

   ---------------

   -- Reference --

   ---------------

   function Reference (Interrupt : Interrupt_ID) return System.Address is

   begin

      return SI.Reference (SI.Interrupt_ID (Interrupt));

   end Reference;

end Ada.Interrupts;