659 lines
20 KiB
Ada
659 lines
20 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . I N T E R R U P T S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1998-2020, Free Software Foundation, Inc. --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies, Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is the NT version of this package
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with Ada.Task_Identification;
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with Ada.Unchecked_Conversion;
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with Interfaces.C;
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with System.Storage_Elements;
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with System.Task_Primitives.Operations;
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with System.Tasking.Utilities;
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with System.Tasking.Rendezvous;
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with System.Tasking.Initialization;
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with System.Interrupt_Management;
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package body System.Interrupts is
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use Tasking;
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use System.OS_Interface;
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use Interfaces.C;
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package STPO renames System.Task_Primitives.Operations;
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package IMNG renames System.Interrupt_Management;
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subtype int is Interfaces.C.int;
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function To_System is new Ada.Unchecked_Conversion
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(Ada.Task_Identification.Task_Id, Task_Id);
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type Handler_Kind is (Unknown, Task_Entry, Protected_Procedure);
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type Handler_Desc is record
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Kind : Handler_Kind := Unknown;
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T : Task_Id;
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E : Task_Entry_Index;
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H : Parameterless_Handler;
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Static : Boolean := False;
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end record;
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task type Server_Task (Interrupt : Interrupt_ID) is
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pragma Interrupt_Priority (System.Interrupt_Priority'Last);
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end Server_Task;
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type Server_Task_Access is access Server_Task;
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Handlers : array (Interrupt_ID) of Task_Id;
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Descriptors : array (Interrupt_ID) of Handler_Desc;
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Interrupt_Count : array (Interrupt_ID) of Integer := (others => 0);
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pragma Volatile_Components (Interrupt_Count);
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procedure Attach_Handler
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(New_Handler : Parameterless_Handler;
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Interrupt : Interrupt_ID;
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Static : Boolean;
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Restoration : Boolean);
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-- This internal procedure is needed to finalize protected objects that
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-- contain interrupt handlers.
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procedure Signal_Handler (Sig : Interrupt_ID);
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pragma Convention (C, Signal_Handler);
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-- This procedure is used to handle all the signals
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-- Type and Head, Tail of the list containing Registered Interrupt
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-- Handlers. These definitions are used to register the handlers
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-- specified by the pragma Interrupt_Handler.
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--------------------------
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-- Handler Registration --
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--------------------------
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type Registered_Handler;
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type R_Link is access all Registered_Handler;
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type Registered_Handler is record
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H : System.Address := System.Null_Address;
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Next : R_Link := null;
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end record;
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Registered_Handlers : R_Link := null;
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function Is_Registered (Handler : Parameterless_Handler) return Boolean;
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-- See if the Handler has been "pragma"ed using Interrupt_Handler.
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-- Always consider a null handler as registered.
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type Handler_Ptr is access procedure (Sig : Interrupt_ID);
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pragma Convention (C, Handler_Ptr);
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function TISR is new Ada.Unchecked_Conversion (Handler_Ptr, isr_address);
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--------------------
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-- Signal_Handler --
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--------------------
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procedure Signal_Handler (Sig : Interrupt_ID) is
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Handler : Task_Id renames Handlers (Sig);
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begin
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if Intr_Attach_Reset and then
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intr_attach (int (Sig), TISR (Signal_Handler'Access)) = FUNC_ERR
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then
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raise Program_Error;
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end if;
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if Handler /= null then
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Interrupt_Count (Sig) := Interrupt_Count (Sig) + 1;
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STPO.Wakeup (Handler, Interrupt_Server_Idle_Sleep);
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end if;
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end Signal_Handler;
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-----------------
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-- Is_Reserved --
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-----------------
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function Is_Reserved (Interrupt : Interrupt_ID) return Boolean is
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begin
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return IMNG.Reserve (IMNG.Interrupt_ID (Interrupt));
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end Is_Reserved;
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-----------------------
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-- Is_Entry_Attached --
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-----------------------
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function Is_Entry_Attached (Interrupt : Interrupt_ID) return Boolean is
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begin
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if Is_Reserved (Interrupt) then
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raise Program_Error with
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"interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved";
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end if;
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return Descriptors (Interrupt).T /= Null_Task;
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end Is_Entry_Attached;
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-------------------------
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-- Is_Handler_Attached --
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-------------------------
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function Is_Handler_Attached (Interrupt : Interrupt_ID) return Boolean is
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begin
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if Is_Reserved (Interrupt) then
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raise Program_Error with
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"interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved";
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else
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return Descriptors (Interrupt).Kind /= Unknown;
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end if;
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end Is_Handler_Attached;
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----------------
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-- Is_Ignored --
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----------------
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function Is_Ignored (Interrupt : Interrupt_ID) return Boolean is
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begin
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raise Program_Error;
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return False;
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end Is_Ignored;
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------------------
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-- Unblocked_By --
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------------------
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function Unblocked_By (Interrupt : Interrupt_ID) return Task_Id is
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begin
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raise Program_Error;
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return Null_Task;
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end Unblocked_By;
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----------------------
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-- Ignore_Interrupt --
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----------------------
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procedure Ignore_Interrupt (Interrupt : Interrupt_ID) is
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begin
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raise Program_Error;
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end Ignore_Interrupt;
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------------------------
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-- Unignore_Interrupt --
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------------------------
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procedure Unignore_Interrupt (Interrupt : Interrupt_ID) is
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begin
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raise Program_Error;
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end Unignore_Interrupt;
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-------------------------------------
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-- Has_Interrupt_Or_Attach_Handler --
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-------------------------------------
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function Has_Interrupt_Or_Attach_Handler
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(Object : access Dynamic_Interrupt_Protection) return Boolean
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is
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pragma Unreferenced (Object);
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begin
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return True;
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end Has_Interrupt_Or_Attach_Handler;
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--------------
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-- Finalize --
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--------------
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procedure Finalize (Object : in out Static_Interrupt_Protection) is
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begin
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-- ??? loop to be executed only when we're not doing library level
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-- finalization, since in this case all interrupt tasks are gone.
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for N in reverse Object.Previous_Handlers'Range loop
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Attach_Handler
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(New_Handler => Object.Previous_Handlers (N).Handler,
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Interrupt => Object.Previous_Handlers (N).Interrupt,
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Static => Object.Previous_Handlers (N).Static,
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Restoration => True);
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end loop;
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Tasking.Protected_Objects.Entries.Finalize
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(Tasking.Protected_Objects.Entries.Protection_Entries (Object));
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end Finalize;
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-------------------------------------
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-- Has_Interrupt_Or_Attach_Handler --
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-------------------------------------
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function Has_Interrupt_Or_Attach_Handler
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(Object : access Static_Interrupt_Protection) return Boolean
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is
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pragma Unreferenced (Object);
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begin
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return True;
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end Has_Interrupt_Or_Attach_Handler;
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----------------------
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-- Install_Handlers --
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----------------------
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procedure Install_Handlers
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(Object : access Static_Interrupt_Protection;
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New_Handlers : New_Handler_Array)
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is
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begin
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for N in New_Handlers'Range loop
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-- We need a lock around this ???
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Object.Previous_Handlers (N).Interrupt := New_Handlers (N).Interrupt;
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Object.Previous_Handlers (N).Static := Descriptors
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(New_Handlers (N).Interrupt).Static;
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-- We call Exchange_Handler and not directly Interrupt_Manager.
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-- Exchange_Handler so we get the Is_Reserved check.
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Exchange_Handler
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(Old_Handler => Object.Previous_Handlers (N).Handler,
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New_Handler => New_Handlers (N).Handler,
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Interrupt => New_Handlers (N).Interrupt,
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Static => True);
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end loop;
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end Install_Handlers;
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---------------------------------
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-- Install_Restricted_Handlers --
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---------------------------------
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procedure Install_Restricted_Handlers
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(Prio : Any_Priority;
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Handlers : New_Handler_Array)
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is
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pragma Unreferenced (Prio);
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begin
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for N in Handlers'Range loop
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Attach_Handler (Handlers (N).Handler, Handlers (N).Interrupt, True);
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end loop;
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end Install_Restricted_Handlers;
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---------------------
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-- Current_Handler --
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---------------------
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function Current_Handler
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(Interrupt : Interrupt_ID) return Parameterless_Handler
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is
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begin
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if Is_Reserved (Interrupt) then
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raise Program_Error;
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end if;
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if Descriptors (Interrupt).Kind = Protected_Procedure then
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return Descriptors (Interrupt).H;
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else
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return null;
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end if;
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end Current_Handler;
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--------------------
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-- Attach_Handler --
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--------------------
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procedure Attach_Handler
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(New_Handler : Parameterless_Handler;
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Interrupt : Interrupt_ID;
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Static : Boolean := False)
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is
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begin
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Attach_Handler (New_Handler, Interrupt, Static, False);
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end Attach_Handler;
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procedure Attach_Handler
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(New_Handler : Parameterless_Handler;
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Interrupt : Interrupt_ID;
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Static : Boolean;
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Restoration : Boolean)
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is
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New_Task : Server_Task_Access;
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begin
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if Is_Reserved (Interrupt) then
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raise Program_Error;
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end if;
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if not Restoration and then not Static
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-- Tries to overwrite a static Interrupt Handler with dynamic handle
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and then
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(Descriptors (Interrupt).Static
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-- New handler not specified as an Interrupt Handler by a pragma
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or else not Is_Registered (New_Handler))
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then
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raise Program_Error with
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"trying to overwrite a static interrupt handler with a " &
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"dynamic handler";
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end if;
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if Handlers (Interrupt) = null then
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New_Task := new Server_Task (Interrupt);
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Handlers (Interrupt) := To_System (New_Task.all'Identity);
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end if;
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if intr_attach (int (Interrupt),
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TISR (Signal_Handler'Access)) = FUNC_ERR
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then
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raise Program_Error;
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end if;
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if New_Handler = null then
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-- The null handler means we are detaching the handler
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Descriptors (Interrupt) :=
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(Kind => Unknown, T => null, E => 0, H => null, Static => False);
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else
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Descriptors (Interrupt).Kind := Protected_Procedure;
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Descriptors (Interrupt).H := New_Handler;
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Descriptors (Interrupt).Static := Static;
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end if;
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end Attach_Handler;
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----------------------
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-- Exchange_Handler --
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----------------------
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procedure Exchange_Handler
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(Old_Handler : out Parameterless_Handler;
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New_Handler : Parameterless_Handler;
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Interrupt : Interrupt_ID;
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Static : Boolean := False)
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is
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begin
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if Is_Reserved (Interrupt) then
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raise Program_Error;
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end if;
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if Descriptors (Interrupt).Kind = Task_Entry then
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-- In case we have an Interrupt Entry already installed, raise a
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-- program error (propagate it to the caller).
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raise Program_Error with "an interrupt is already installed";
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else
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Old_Handler := Current_Handler (Interrupt);
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Attach_Handler (New_Handler, Interrupt, Static);
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end if;
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end Exchange_Handler;
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--------------------
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-- Detach_Handler --
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--------------------
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procedure Detach_Handler
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(Interrupt : Interrupt_ID;
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Static : Boolean := False)
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is
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begin
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if Is_Reserved (Interrupt) then
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raise Program_Error;
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end if;
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if Descriptors (Interrupt).Kind = Task_Entry then
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raise Program_Error with "trying to detach an interrupt entry";
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end if;
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if not Static and then Descriptors (Interrupt).Static then
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raise Program_Error with
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"trying to detach a static interrupt handler";
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end if;
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Descriptors (Interrupt) :=
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(Kind => Unknown, T => null, E => 0, H => null, Static => False);
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if intr_attach (int (Interrupt), null) = FUNC_ERR then
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raise Program_Error;
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end if;
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end Detach_Handler;
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---------------
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-- Reference --
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---------------
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function Reference (Interrupt : Interrupt_ID) return System.Address is
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Signal : constant System.Address :=
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System.Storage_Elements.To_Address
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(System.Storage_Elements.Integer_Address (Interrupt));
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begin
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if Is_Reserved (Interrupt) then
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-- Only usable Interrupts can be used for binding it to an Entry
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raise Program_Error;
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end if;
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return Signal;
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end Reference;
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--------------------------------
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-- Register_Interrupt_Handler --
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--------------------------------
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procedure Register_Interrupt_Handler (Handler_Addr : System.Address) is
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begin
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Registered_Handlers :=
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new Registered_Handler'(H => Handler_Addr, Next => Registered_Handlers);
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end Register_Interrupt_Handler;
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-------------------
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-- Is_Registered --
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-------------------
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-- See if the Handler has been "pragma"ed using Interrupt_Handler.
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-- Always consider a null handler as registered.
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function Is_Registered (Handler : Parameterless_Handler) return Boolean is
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Ptr : R_Link := Registered_Handlers;
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type Acc_Proc is access procedure;
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type Fat_Ptr is record
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Object_Addr : System.Address;
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Handler_Addr : Acc_Proc;
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end record;
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function To_Fat_Ptr is new Ada.Unchecked_Conversion
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(Parameterless_Handler, Fat_Ptr);
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Fat : Fat_Ptr;
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begin
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if Handler = null then
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return True;
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end if;
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Fat := To_Fat_Ptr (Handler);
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while Ptr /= null loop
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if Ptr.H = Fat.Handler_Addr.all'Address then
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return True;
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end if;
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Ptr := Ptr.Next;
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end loop;
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return False;
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end Is_Registered;
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-----------------------------
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-- Bind_Interrupt_To_Entry --
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-----------------------------
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procedure Bind_Interrupt_To_Entry
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(T : Task_Id;
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E : Task_Entry_Index;
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Int_Ref : System.Address)
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is
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Interrupt : constant Interrupt_ID :=
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Interrupt_ID (Storage_Elements.To_Integer (Int_Ref));
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New_Task : Server_Task_Access;
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begin
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if Is_Reserved (Interrupt) then
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raise Program_Error;
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end if;
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if Descriptors (Interrupt).Kind /= Unknown then
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raise Program_Error with
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"a binding for this interrupt is already present";
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end if;
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if Handlers (Interrupt) = null then
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New_Task := new Server_Task (Interrupt);
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Handlers (Interrupt) := To_System (New_Task.all'Identity);
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end if;
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if intr_attach (int (Interrupt),
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TISR (Signal_Handler'Access)) = FUNC_ERR
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then
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raise Program_Error;
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end if;
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Descriptors (Interrupt).Kind := Task_Entry;
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Descriptors (Interrupt).T := T;
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Descriptors (Interrupt).E := E;
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-- Indicate the attachment of Interrupt Entry in ATCB. This is needed so
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-- that when an Interrupt Entry task terminates the binding can be
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-- cleaned up. The call to unbinding must be make by the task before it
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-- terminates.
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T.Interrupt_Entry := True;
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end Bind_Interrupt_To_Entry;
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------------------------------
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-- Detach_Interrupt_Entries --
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------------------------------
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procedure Detach_Interrupt_Entries (T : Task_Id) is
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begin
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for J in Interrupt_ID loop
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if not Is_Reserved (J) then
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if Descriptors (J).Kind = Task_Entry
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and then Descriptors (J).T = T
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then
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Descriptors (J).Kind := Unknown;
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if intr_attach (int (J), null) = FUNC_ERR then
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raise Program_Error;
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end if;
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end if;
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end if;
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end loop;
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-- Indicate in ATCB that no Interrupt Entries are attached
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T.Interrupt_Entry := True;
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end Detach_Interrupt_Entries;
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|
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---------------------
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-- Block_Interrupt --
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---------------------
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procedure Block_Interrupt (Interrupt : Interrupt_ID) is
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begin
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raise Program_Error;
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end Block_Interrupt;
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|
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-----------------------
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-- Unblock_Interrupt --
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|
-----------------------
|
|
|
|
procedure Unblock_Interrupt (Interrupt : Interrupt_ID) is
|
|
begin
|
|
raise Program_Error;
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|
end Unblock_Interrupt;
|
|
|
|
----------------
|
|
-- Is_Blocked --
|
|
----------------
|
|
|
|
function Is_Blocked (Interrupt : Interrupt_ID) return Boolean is
|
|
begin
|
|
raise Program_Error;
|
|
return False;
|
|
end Is_Blocked;
|
|
|
|
task body Server_Task is
|
|
Ignore : constant Boolean := Utilities.Make_Independent;
|
|
|
|
Desc : Handler_Desc renames Descriptors (Interrupt);
|
|
Self_Id : constant Task_Id := STPO.Self;
|
|
Temp : Parameterless_Handler;
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|
|
|
begin
|
|
loop
|
|
while Interrupt_Count (Interrupt) > 0 loop
|
|
Interrupt_Count (Interrupt) := Interrupt_Count (Interrupt) - 1;
|
|
begin
|
|
case Desc.Kind is
|
|
when Unknown =>
|
|
null;
|
|
when Task_Entry =>
|
|
Rendezvous.Call_Simple (Desc.T, Desc.E, Null_Address);
|
|
when Protected_Procedure =>
|
|
Temp := Desc.H;
|
|
Temp.all;
|
|
end case;
|
|
exception
|
|
when others => null;
|
|
end;
|
|
end loop;
|
|
|
|
Initialization.Defer_Abort (Self_Id);
|
|
STPO.Write_Lock (Self_Id);
|
|
Self_Id.Common.State := Interrupt_Server_Idle_Sleep;
|
|
STPO.Sleep (Self_Id, Interrupt_Server_Idle_Sleep);
|
|
Self_Id.Common.State := Runnable;
|
|
STPO.Unlock (Self_Id);
|
|
Initialization.Undefer_Abort (Self_Id);
|
|
|
|
-- Undefer abort here to allow a window for this task to be aborted
|
|
-- at the time of system shutdown.
|
|
|
|
end loop;
|
|
end Server_Task;
|
|
|
|
end System.Interrupts;
|