gcc/ada/a-interr.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
   4 --                                                                          --
   5 --                         A D A . I N T E R R U P T S                      --
   6 --                                                                          --
   7 --                                  B o d y                                 --
   8 --                                                                          --
   9 --             Copyright (C) 1991-1994, Florida State University            --
  10 --             Copyright (C) 1995-2003, Ada Core Technologies               --
  11 --                                                                          --
  12 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNARL was developed by the GNARL team at Florida State University.       --
  31 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 with System.Interrupts;
  36 --  used for Interrupt_ID
  37 --           Parameterless_Handler
  38 --           Is_Reserved
  39 --           Is_Handler_Attached
  40 --           Current_Handler
  41 --           Attach_Handler
  42 --           Exchange_Handler
  43 --           Detach_Handler
  44 --           Reference
  45
  46 with Unchecked_Conversion;
  47
  48 package body Ada.Interrupts is
  49
  50    package SI renames System.Interrupts;
  51
  52    function To_System is new Unchecked_Conversion
  53      (Parameterless_Handler, SI.Parameterless_Handler);
  54
  55    function To_Ada is new Unchecked_Conversion
  56      (SI.Parameterless_Handler, Parameterless_Handler);
  57
  58    --------------------
  59    -- Attach_Handler --
  60    --------------------
  61
  62    procedure Attach_Handler
  63      (New_Handler : Parameterless_Handler;
  64       Interrupt   : Interrupt_ID)
  65    is
  66    begin
  67       SI.Attach_Handler
  68         (To_System (New_Handler), SI.Interrupt_ID (Interrupt), False);
  69    end Attach_Handler;
  70
  71    ---------------------
  72    -- Current_Handler --
  73    ---------------------
  74
  75    function Current_Handler
  76      (Interrupt : Interrupt_ID)
  77       return      Parameterless_Handler
  78    is
  79    begin
  80       return To_Ada (SI.Current_Handler (SI.Interrupt_ID (Interrupt)));
  81    end Current_Handler;
  82
  83    --------------------
  84    -- Detach_Handler --
  85    --------------------
  86
  87    procedure Detach_Handler (Interrupt : in Interrupt_ID) is
  88    begin
  89       SI.Detach_Handler (SI.Interrupt_ID (Interrupt), False);
  90    end Detach_Handler;
  91
  92    ----------------------
  93    -- Exchange_Handler --
  94    ----------------------
  95
  96    procedure Exchange_Handler
  97      (Old_Handler : out Parameterless_Handler;
  98       New_Handler : Parameterless_Handler;
  99       Interrupt   : Interrupt_ID)
 100    is
 101       H : SI.Parameterless_Handler;
 102
 103    begin
 104       SI.Exchange_Handler
 105         (H, To_System (New_Handler),
 106          SI.Interrupt_ID (Interrupt), False);
 107       Old_Handler := To_Ada (H);
 108    end Exchange_Handler;
 109
 110    -----------------
 111    -- Is_Attached --
 112    -----------------
 113
 114    function Is_Attached (Interrupt : Interrupt_ID) return Boolean is
 115    begin
 116       return SI.Is_Handler_Attached (SI.Interrupt_ID (Interrupt));
 117    end Is_Attached;
 118
 119    -----------------
 120    -- Is_Reserved --
 121    -----------------
 122
 123    function Is_Reserved (Interrupt : Interrupt_ID) return Boolean is
 124    begin
 125       return SI.Is_Reserved (SI.Interrupt_ID (Interrupt));
 126    end Is_Reserved;
 127
 128    ---------------
 129    -- Reference --
 130    ---------------
 131
 132    function Reference (Interrupt : Interrupt_ID) return System.Address is
 133    begin
 134       return SI.Reference (SI.Interrupt_ID (Interrupt));
 135    end Reference;
 136
 137 end Ada.Interrupts;