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 --                                                                          --
  10 --             Copyright (C) 1991-2001 Florida State University             --
  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. It is --
  31 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  32 -- State University (http://www.gnat.com).                                  --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 with System.Interrupts;
  37 --  used for Interrupt_ID
  38 --           Parameterless_Handler
  39 --           Is_Reserved
  40 --           Is_Handler_Attached
  41 --           Current_Handler
  42 --           Attach_Handler
  43 --           Exchange_Handler
  44 --           Detach_Handler
  45 --           Reference
  46
  47 with Unchecked_Conversion;
  48
  49 package body Ada.Interrupts is
  50
  51    package SI renames System.Interrupts;
  52
  53    function To_System is new Unchecked_Conversion
  54      (Parameterless_Handler, SI.Parameterless_Handler);
  55
  56    function To_Ada is new Unchecked_Conversion
  57      (SI.Parameterless_Handler, Parameterless_Handler);
  58
  59    --------------------
  60    -- Attach_Handler --
  61    --------------------
  62
  63    procedure Attach_Handler
  64      (New_Handler : Parameterless_Handler;
  65       Interrupt   : Interrupt_ID)
  66    is
  67    begin
  68       SI.Attach_Handler
  69         (To_System (New_Handler), SI.Interrupt_ID (Interrupt), False);
  70    end Attach_Handler;
  71
  72    ---------------------
  73    -- Current_Handler --
  74    ---------------------
  75
  76    function Current_Handler
  77      (Interrupt : Interrupt_ID)
  78       return      Parameterless_Handler
  79    is
  80    begin
  81       return To_Ada (SI.Current_Handler (SI.Interrupt_ID (Interrupt)));
  82    end Current_Handler;
  83
  84    --------------------
  85    -- Detach_Handler --
  86    --------------------
  87
  88    procedure Detach_Handler (Interrupt : in Interrupt_ID) is
  89    begin
  90       SI.Detach_Handler (SI.Interrupt_ID (Interrupt), False);
  91    end Detach_Handler;
  92
  93    ----------------------
  94    -- Exchange_Handler --
  95    ----------------------
  96
  97    procedure Exchange_Handler
  98      (Old_Handler : out Parameterless_Handler;
  99       New_Handler : Parameterless_Handler;
 100       Interrupt   : Interrupt_ID)
 101    is
 102       H : SI.Parameterless_Handler;
 103
 104    begin
 105       SI.Exchange_Handler
 106         (H, To_System (New_Handler),
 107          SI.Interrupt_ID (Interrupt), False);
 108       Old_Handler := To_Ada (H);
 109    end Exchange_Handler;
 110
 111    -----------------
 112    -- Is_Attached --
 113    -----------------
 114
 115    function Is_Attached (Interrupt : Interrupt_ID) return Boolean is
 116    begin
 117       return SI.Is_Handler_Attached (SI.Interrupt_ID (Interrupt));
 118    end Is_Attached;
 119
 120    -----------------
 121    -- Is_Reserved --
 122    -----------------
 123
 124    function Is_Reserved (Interrupt : Interrupt_ID) return Boolean is
 125    begin
 126       return SI.Is_Reserved (SI.Interrupt_ID (Interrupt));
 127    end Is_Reserved;
 128
 129    ---------------
 130    -- Reference --
 131    ---------------
 132
 133    function Reference (Interrupt : Interrupt_ID) return System.Address is
 134    begin
 135       return SI.Reference (SI.Interrupt_ID (Interrupt));
 136    end Reference;
 137
 138 end Ada.Interrupts;