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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;
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