New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45952 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 280 insertions, 0 deletions

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+------------------------------------------------------------------------------
+--                                                                          --
+--                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
+--                                                                          --
+--           S Y S T E M . I N T E R R U P T _ M A N A G E M E N T .        --
+--                           O P E R A T I O N S                            --
+--                                                                          --
+--                                  B o d y                                 --
+--                                                                          --
+--                             $Revision: 1.8 $                             --
+--                                                                          --
+--             Copyright (C) 1991-2000 Florida State University             --
+--                                                                          --
+-- 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,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, 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. It is --
+-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
+-- State University (http://www.gnat.com).                                  --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This is a OpenVMS/Alpha version of this package.
+
+with System.OS_Interface;
+--  used for various type, constant, and operations
+
+with System.Tasking;
+
+with System.Tasking.Initialization;
+
+with System.Task_Primitives.Operations;
+
+with System.Task_Primitives.Operations.DEC;
+
+with Unchecked_Conversion;
+
+package body System.Interrupt_Management.Operations is
+
+   use System.OS_Interface;
+   use System.Tasking;
+   use type unsigned_short;
+
+   function To_Address is new Unchecked_Conversion (Task_ID, System.Address);
+   function To_Task_ID is new Unchecked_Conversion (System.Address, Task_ID);
+   package POP renames System.Task_Primitives.Operations;
+
+   ----------------------------
+   -- Thread_Block_Interrupt --
+   ----------------------------
+
+   procedure Thread_Block_Interrupt (Interrupt : Interrupt_ID) is
+   begin
+      null;
+   end Thread_Block_Interrupt;
+
+   ------------------------------
+   -- Thread_Unblock_Interrupt --
+   ------------------------------
+
+   procedure Thread_Unblock_Interrupt (Interrupt : Interrupt_ID) is
+   begin
+      null;
+   end Thread_Unblock_Interrupt;
+
+   ------------------------
+   -- Set_Interrupt_Mask --
+   ------------------------
+
+   procedure Set_Interrupt_Mask (Mask : access Interrupt_Mask) is
+   begin
+      null;
+   end Set_Interrupt_Mask;
+
+   procedure Set_Interrupt_Mask
+     (Mask  : access Interrupt_Mask;
+      OMask : access Interrupt_Mask) is
+   begin
+      null;
+   end Set_Interrupt_Mask;
+
+   ------------------------
+   -- Get_Interrupt_Mask --
+   ------------------------
+
+   procedure Get_Interrupt_Mask (Mask : access Interrupt_Mask) is
+   begin
+      null;
+   end Get_Interrupt_Mask;
+
+   --------------------
+   -- Interrupt_Wait --
+   --------------------
+
+   function To_unsigned_long is new
+     Unchecked_Conversion (System.Address, unsigned_long);
+
+   function Interrupt_Wait (Mask : access Interrupt_Mask)
+     return Interrupt_ID
+   is
+      Self_ID : Task_ID := Self;
+      Iosb    : IO_Status_Block_Type := (0, 0, 0);
+      Status  : Cond_Value_Type;
+
+   begin
+
+      --  A QIO read is registered. The system call returns immediately
+      --  after scheduling an AST to be fired when the operation
+      --  completes.
+
+      Sys_QIO
+        (Status => Status,
+         Chan   => Rcv_Interrupt_Chan,
+         Func   => IO_READVBLK,
+         Iosb   => Iosb,
+         Astadr =>
+           POP.DEC.Interrupt_AST_Handler'Access,
+         Astprm => To_Address (Self_ID),
+         P1     => To_unsigned_long (Interrupt_Mailbox'Address),
+         P2     => Interrupt_ID'Size / 8);
+
+      pragma Assert ((Status and 1) = 1);
+
+      loop
+
+         --  Wait to be woken up. Could be that the AST has fired,
+         --  in which case the Iosb.Status variable will be non-zero,
+         --  or maybe the wait is being aborted.
+
+         POP.Sleep
+           (Self_ID,
+            System.Tasking.Interrupt_Server_Blocked_On_Event_Flag);
+
+         if Iosb.Status /= 0 then
+            if (Iosb.Status and 1) = 1
+              and then Mask (Signal (Interrupt_Mailbox))
+            then
+               return Interrupt_Mailbox;
+            else
+               return 0;
+            end if;
+         else
+            POP.Unlock (Self_ID);
+            System.Tasking.Initialization.Undefer_Abort (Self_ID);
+            System.Tasking.Initialization.Defer_Abort (Self_ID);
+            POP.Write_Lock (Self_ID);
+         end if;
+      end loop;
+   end Interrupt_Wait;
+
+   ----------------------------
+   -- Install_Default_Action --
+   ----------------------------
+
+   procedure Install_Default_Action (Interrupt : Interrupt_ID) is
+   begin
+      null;
+   end Install_Default_Action;
+
+   ---------------------------
+   -- Install_Ignore_Action --
+   ---------------------------
+
+   procedure Install_Ignore_Action (Interrupt : Interrupt_ID) is
+   begin
+      null;
+   end Install_Ignore_Action;
+
+   -------------------------
+   -- Fill_Interrupt_Mask --
+   -------------------------
+
+   procedure Fill_Interrupt_Mask (Mask : access Interrupt_Mask) is
+   begin
+      Mask.all := (others => True);
+   end Fill_Interrupt_Mask;
+
+   --------------------------
+   -- Empty_Interrupt_Mask --
+   --------------------------
+
+   procedure Empty_Interrupt_Mask (Mask : access Interrupt_Mask) is
+   begin
+      Mask.all := (others => False);
+   end Empty_Interrupt_Mask;
+
+   ---------------------------
+   -- Add_To_Interrupt_Mask --
+   ---------------------------
+
+   procedure Add_To_Interrupt_Mask
+     (Mask      : access Interrupt_Mask;
+      Interrupt : Interrupt_ID)
+   is
+   begin
+      Mask (Signal (Interrupt)) := True;
+   end Add_To_Interrupt_Mask;
+
+   --------------------------------
+   -- Delete_From_Interrupt_Mask --
+   --------------------------------
+
+   procedure Delete_From_Interrupt_Mask
+     (Mask      : access Interrupt_Mask;
+      Interrupt : Interrupt_ID)
+   is
+   begin
+      Mask (Signal (Interrupt)) := False;
+   end Delete_From_Interrupt_Mask;
+
+   ---------------
+   -- Is_Member --
+   ---------------
+
+   function Is_Member
+     (Mask      : access Interrupt_Mask;
+      Interrupt : Interrupt_ID) return Boolean
+   is
+   begin
+      return Mask (Signal (Interrupt));
+   end Is_Member;
+
+   -------------------------
+   -- Copy_Interrupt_Mask --
+   -------------------------
+
+   procedure Copy_Interrupt_Mask
+     (X : out Interrupt_Mask;
+      Y : Interrupt_Mask)
+   is
+   begin
+      X := Y;
+   end Copy_Interrupt_Mask;
+
+   -------------------------
+   -- Interrupt_Self_Process --
+   -------------------------
+
+   procedure Interrupt_Self_Process (Interrupt : Interrupt_ID) is
+      Status : Cond_Value_Type;
+   begin
+      Sys_QIO
+        (Status => Status,
+         Chan   => Snd_Interrupt_Chan,
+         Func   => IO_WRITEVBLK,
+         P1     => To_unsigned_long (Interrupt'Address),
+         P2     => Interrupt_ID'Size / 8);
+
+      pragma Assert ((Status and 1) = 1);
+
+   end Interrupt_Self_Process;
+
+begin
+
+   Environment_Mask := (others => False);
+   All_Tasks_Mask := (others => True);
+
+   for I in Interrupt_ID loop
+      if Keep_Unmasked (I) then
+         Environment_Mask (Signal (I)) := True;
+         All_Tasks_Mask (Signal (I)) := False;
+      end if;
+   end loop;
+
+end System.Interrupt_Management.Operations;