1114 lines
37 KiB
Ada
1114 lines
37 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) 1992-2020, 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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-- Invariants:
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-- All user-handlable signals are masked at all times in all tasks/threads
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-- except possibly for the Interrupt_Manager task.
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-- When a user task wants to have the effect of masking/unmasking an signal,
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-- it must call Block_Interrupt/Unblock_Interrupt, which will have the effect
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-- of unmasking/masking the signal in the Interrupt_Manager task. These
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-- comments do not apply to vectored hardware interrupts, which may be masked
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-- or unmasked using routined interfaced to the relevant embedded RTOS system
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-- calls.
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-- Once we associate a Signal_Server_Task with an signal, the task never goes
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-- away, and we never remove the association. On the other hand, it is more
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-- convenient to terminate an associated Interrupt_Server_Task for a vectored
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-- hardware interrupt (since we use a binary semaphore for synchronization
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-- with the umbrella handler).
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-- There is no more than one signal per Signal_Server_Task and no more than
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-- one Signal_Server_Task per signal. The same relation holds for hardware
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-- interrupts and Interrupt_Server_Task's at any given time. That is, only
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-- one non-terminated Interrupt_Server_Task exists for a give interrupt at
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-- any time.
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-- Within this package, the lock L is used to protect the various status
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-- tables. If there is a Server_Task associated with a signal or interrupt,
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-- we use the per-task lock of the Server_Task instead so that we protect the
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-- status between Interrupt_Manager and Server_Task. Protection among service
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-- requests are ensured via user calls to the Interrupt_Manager entries.
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-- This is reasonably generic version of this package, supporting vectored
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-- hardware interrupts using non-RTOS specific adapter routines which should
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-- easily implemented on any RTOS capable of supporting GNAT.
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with Ada.Unchecked_Conversion;
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with Ada.Task_Identification;
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with Interfaces.C; use Interfaces.C;
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with System.OS_Interface; use System.OS_Interface;
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with System.Interrupt_Management;
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with System.Task_Primitives.Operations;
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with System.Storage_Elements;
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with System.Tasking.Utilities;
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with System.Tasking.Rendezvous;
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pragma Elaborate_All (System.Tasking.Rendezvous);
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package body System.Interrupts is
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use Tasking;
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package POP renames System.Task_Primitives.Operations;
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function To_Ada is new Ada.Unchecked_Conversion
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(System.Tasking.Task_Id, Ada.Task_Identification.Task_Id);
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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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-----------------
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-- Local Tasks --
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-----------------
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-- WARNING: System.Tasking.Stages performs calls to this task with low-
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-- level constructs. Do not change this spec without synchronizing it.
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task Interrupt_Manager is
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entry Detach_Interrupt_Entries (T : Task_Id);
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entry 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 := False);
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entry 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);
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entry Detach_Handler
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(Interrupt : Interrupt_ID;
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Static : Boolean);
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entry Bind_Interrupt_To_Entry
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(T : Task_Id;
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E : Task_Entry_Index;
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Interrupt : Interrupt_ID);
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pragma Interrupt_Priority (System.Interrupt_Priority'First);
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end Interrupt_Manager;
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task type Interrupt_Server_Task
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(Interrupt : Interrupt_ID;
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Int_Sema : Binary_Semaphore_Id)
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is
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-- Server task for vectored hardware interrupt handling
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pragma Interrupt_Priority (System.Interrupt_Priority'First + 2);
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end Interrupt_Server_Task;
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type Interrupt_Task_Access is access Interrupt_Server_Task;
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-------------------------------
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-- Local Types and Variables --
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-------------------------------
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type Entry_Assoc is record
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T : Task_Id;
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E : Task_Entry_Index;
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end record;
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type Handler_Assoc is record
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H : Parameterless_Handler;
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Static : Boolean; -- Indicates static binding;
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end record;
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User_Handler : array (Interrupt_ID) of Handler_Assoc :=
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(others => (null, Static => False));
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pragma Volatile_Components (User_Handler);
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-- Holds the protected procedure handler (if any) and its Static
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-- information for each interrupt or signal. A handler is static iff it
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-- is specified through the pragma Attach_Handler.
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User_Entry : array (Interrupt_ID) of Entry_Assoc :=
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(others => (T => Null_Task, E => Null_Task_Entry));
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pragma Volatile_Components (User_Entry);
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-- Holds the task and entry index (if any) for each interrupt / signal
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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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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_Handler_Head : R_Link := null;
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Registered_Handler_Tail : R_Link := null;
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Server_ID : array (Interrupt_ID) of System.Tasking.Task_Id :=
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(others => System.Tasking.Null_Task);
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pragma Atomic_Components (Server_ID);
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-- Holds the Task_Id of the Server_Task for each interrupt / signal.
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-- Task_Id is needed to accomplish locking per interrupt base. Also
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-- is needed to determine whether to create a new Server_Task.
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Semaphore_ID_Map : array
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(Interrupt_ID range 0 .. System.OS_Interface.Max_HW_Interrupt) of
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Binary_Semaphore_Id := (others => 0);
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-- Array of binary semaphores associated with vectored interrupts. Note
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-- that the last bound should be Max_HW_Interrupt, but this will raise
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-- Storage_Error if Num_HW_Interrupts is null so use extra 4 bytes instead.
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Interrupt_Access_Hold : Interrupt_Task_Access;
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-- Variable for allocating an Interrupt_Server_Task
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Handler_Installed : array (HW_Interrupt) of Boolean := (others => False);
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-- True if Notify_Interrupt was connected to the interrupt. Handlers can
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-- be connected but disconnection is not possible on VxWorks. Therefore
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-- we ensure Notify_Installed is connected at most once.
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-----------------------
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-- Local Subprograms --
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-----------------------
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procedure Check_Reserved_Interrupt (Interrupt : Interrupt_ID);
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-- Check if Id is a reserved interrupt, and if so raise Program_Error
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-- with an appropriate message, otherwise return.
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procedure Finalize_Interrupt_Servers;
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-- Unbind the handlers for hardware interrupt server tasks at program
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-- termination.
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function Is_Registered (Handler : Parameterless_Handler) return Boolean;
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-- See if Handler has been "pragma"ed using Interrupt_Handler.
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-- Always consider a null handler as registered.
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procedure Notify_Interrupt (Param : System.Address);
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pragma Convention (C, Notify_Interrupt);
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-- Umbrella handler for vectored interrupts (not signals)
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procedure Install_Umbrella_Handler
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(Interrupt : HW_Interrupt;
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Handler : System.OS_Interface.Interrupt_Handler);
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-- Install the runtime umbrella handler for a vectored hardware
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-- interrupt
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procedure Unimplemented (Feature : String);
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pragma No_Return (Unimplemented);
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-- Used to mark a call to an unimplemented function. Raises Program_Error
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-- with an appropriate message noting that Feature is unimplemented.
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--------------------
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-- Attach_Handler --
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--------------------
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-- Calling this procedure with New_Handler = null and Static = True
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-- means we want to detach the current handler regardless of the previous
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-- handler's binding status (i.e. do not care if it is a dynamic or static
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-- handler).
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-- This option is needed so that during the finalization of a PO, we can
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-- detach handlers attached through pragma 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 := False) is
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begin
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Check_Reserved_Interrupt (Interrupt);
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Interrupt_Manager.Attach_Handler (New_Handler, Interrupt, Static);
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end Attach_Handler;
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-----------------------------
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-- Bind_Interrupt_To_Entry --
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-----------------------------
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-- This procedure raises a Program_Error if it tries to
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-- bind an interrupt to which an Entry or a Procedure is
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-- already bound.
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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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begin
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Check_Reserved_Interrupt (Interrupt);
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Interrupt_Manager.Bind_Interrupt_To_Entry (T, E, Interrupt);
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end Bind_Interrupt_To_Entry;
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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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Unimplemented ("Block_Interrupt");
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end Block_Interrupt;
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------------------------------
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-- Check_Reserved_Interrupt --
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------------------------------
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procedure Check_Reserved_Interrupt (Interrupt : Interrupt_ID) 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;
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end if;
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end Check_Reserved_Interrupt;
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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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Check_Reserved_Interrupt (Interrupt);
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-- ??? Since Parameterless_Handler is not Atomic, the current
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-- implementation is wrong. We need a new service in Interrupt_Manager
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-- to ensure atomicity.
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return User_Handler (Interrupt).H;
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end Current_Handler;
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--------------------
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-- Detach_Handler --
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--------------------
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-- Calling this procedure with Static = True means we want to Detach the
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-- current handler regardless of the previous handler's binding status
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-- (i.e. do not care if it is a dynamic or static handler).
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-- This option is needed so that during the finalization of a PO, we can
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-- detach handlers attached through pragma Attach_Handler.
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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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Check_Reserved_Interrupt (Interrupt);
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Interrupt_Manager.Detach_Handler (Interrupt, Static);
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end Detach_Handler;
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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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Interrupt_Manager.Detach_Interrupt_Entries (T);
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end Detach_Interrupt_Entries;
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----------------------
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-- Exchange_Handler --
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----------------------
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-- Calling this procedure with New_Handler = null and Static = True
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-- means we want to detach the current handler regardless of the previous
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-- handler's binding status (i.e. we do not care if it is a dynamic or
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-- static handler).
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-- This option is needed so that during the finalization of a PO, we can
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-- detach handlers attached through pragma Attach_Handler.
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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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Check_Reserved_Interrupt (Interrupt);
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Interrupt_Manager.Exchange_Handler
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(Old_Handler, New_Handler, Interrupt, Static);
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end Exchange_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 / signal tasks are
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-- gone.
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if not Interrupt_Manager'Terminated then
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for N in reverse Object.Previous_Handlers'Range loop
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Interrupt_Manager.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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end if;
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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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-- Finalize_Interrupt_Servers --
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--------------------------------
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-- Restore default handlers for interrupt servers
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-- This is called by the Interrupt_Manager task when it receives the abort
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-- signal during program finalization.
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procedure Finalize_Interrupt_Servers is
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HW_Interrupts : constant Boolean := HW_Interrupt'Last >= 0;
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begin
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if HW_Interrupts then
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for Int in HW_Interrupt loop
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if Server_ID (Interrupt_ID (Int)) /= null
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and then
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not Ada.Task_Identification.Is_Terminated
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(To_Ada (Server_ID (Interrupt_ID (Int))))
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then
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Interrupt_Manager.Attach_Handler
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(New_Handler => null,
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Interrupt => Interrupt_ID (Int),
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Static => True,
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Restoration => True);
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end if;
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end loop;
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end if;
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end Finalize_Interrupt_Servers;
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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)
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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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function Has_Interrupt_Or_Attach_Handler
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(Object : access Static_Interrupt_Protection)
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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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-- 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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Unimplemented ("Ignore_Interrupt");
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end Ignore_Interrupt;
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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 := User_Handler
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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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-- Install_Umbrella_Handler --
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------------------------------
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procedure Install_Umbrella_Handler
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(Interrupt : HW_Interrupt;
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Handler : System.OS_Interface.Interrupt_Handler)
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is
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Vec : constant Interrupt_Vector :=
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Interrupt_Number_To_Vector (int (Interrupt));
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Status : int;
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begin
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-- Only install umbrella handler when no Ada handler has already been
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-- installed. Note that the interrupt number is passed as a parameter
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-- when an interrupt occurs, so the umbrella handler has a different
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-- wrapper generated by intConnect for each interrupt number.
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if not Handler_Installed (Interrupt) then
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Status :=
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Interrupt_Connect (Vec, Handler, System.Address (Interrupt));
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pragma Assert (Status = 0);
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Handler_Installed (Interrupt) := True;
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end if;
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end Install_Umbrella_Handler;
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|
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----------------
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-- Is_Blocked --
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----------------
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function Is_Blocked (Interrupt : Interrupt_ID) return Boolean is
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begin
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Unimplemented ("Is_Blocked");
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return False;
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end Is_Blocked;
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|
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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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Check_Reserved_Interrupt (Interrupt);
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return User_Entry (Interrupt).T /= Null_Task;
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end Is_Entry_Attached;
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|
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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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Check_Reserved_Interrupt (Interrupt);
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return User_Handler (Interrupt).H /= null;
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end Is_Handler_Attached;
|
|
|
|
----------------
|
|
-- Is_Ignored --
|
|
----------------
|
|
|
|
function Is_Ignored (Interrupt : Interrupt_ID) return Boolean is
|
|
begin
|
|
Unimplemented ("Is_Ignored");
|
|
return False;
|
|
end Is_Ignored;
|
|
|
|
-------------------
|
|
-- Is_Registered --
|
|
-------------------
|
|
|
|
function Is_Registered (Handler : Parameterless_Handler) return Boolean is
|
|
|
|
type Acc_Proc is access procedure;
|
|
|
|
type Fat_Ptr is record
|
|
Object_Addr : System.Address;
|
|
Handler_Addr : Acc_Proc;
|
|
end record;
|
|
|
|
function To_Fat_Ptr is new Ada.Unchecked_Conversion
|
|
(Parameterless_Handler, Fat_Ptr);
|
|
|
|
Ptr : R_Link;
|
|
Fat : Fat_Ptr;
|
|
|
|
begin
|
|
if Handler = null then
|
|
return True;
|
|
end if;
|
|
|
|
Fat := To_Fat_Ptr (Handler);
|
|
|
|
Ptr := Registered_Handler_Head;
|
|
while Ptr /= null loop
|
|
if Ptr.H = Fat.Handler_Addr.all'Address then
|
|
return True;
|
|
end if;
|
|
|
|
Ptr := Ptr.Next;
|
|
end loop;
|
|
|
|
return False;
|
|
end Is_Registered;
|
|
|
|
-----------------
|
|
-- Is_Reserved --
|
|
-----------------
|
|
|
|
function Is_Reserved (Interrupt : Interrupt_ID) return Boolean is
|
|
use System.Interrupt_Management;
|
|
begin
|
|
return Reserve (System.Interrupt_Management.Interrupt_ID (Interrupt));
|
|
end Is_Reserved;
|
|
|
|
----------------------
|
|
-- Notify_Interrupt --
|
|
----------------------
|
|
|
|
-- Umbrella handler for vectored hardware interrupts (as opposed to signals
|
|
-- and exceptions). As opposed to the signal implementation, this handler
|
|
-- is installed in the vector table when the first Ada handler is attached
|
|
-- to the interrupt. However because VxWorks don't support disconnecting
|
|
-- handlers, this subprogram always test whether or not an Ada handler is
|
|
-- effectively attached.
|
|
|
|
-- Otherwise, the handler that existed prior to program startup is in the
|
|
-- vector table. This ensures that handlers installed by the BSP are active
|
|
-- unless explicitly replaced in the program text.
|
|
|
|
-- Each Interrupt_Server_Task has an associated binary semaphore on which
|
|
-- it pends once it's been started. This routine determines The appropriate
|
|
-- semaphore and issues a semGive call, waking the server task. When
|
|
-- a handler is unbound, System.Interrupts.Unbind_Handler issues a
|
|
-- Binary_Semaphore_Flush, and the server task deletes its semaphore
|
|
-- and terminates.
|
|
|
|
procedure Notify_Interrupt (Param : System.Address) is
|
|
Interrupt : constant Interrupt_ID := Interrupt_ID (Param);
|
|
Id : constant Binary_Semaphore_Id := Semaphore_ID_Map (Interrupt);
|
|
Status : int;
|
|
begin
|
|
if Id /= 0 then
|
|
Status := Binary_Semaphore_Release (Id);
|
|
pragma Assert (Status = 0);
|
|
end if;
|
|
end Notify_Interrupt;
|
|
|
|
---------------
|
|
-- Reference --
|
|
---------------
|
|
|
|
function Reference (Interrupt : Interrupt_ID) return System.Address is
|
|
begin
|
|
Check_Reserved_Interrupt (Interrupt);
|
|
return Storage_Elements.To_Address
|
|
(Storage_Elements.Integer_Address (Interrupt));
|
|
end Reference;
|
|
|
|
--------------------------------
|
|
-- Register_Interrupt_Handler --
|
|
--------------------------------
|
|
|
|
procedure Register_Interrupt_Handler (Handler_Addr : System.Address) is
|
|
New_Node_Ptr : R_Link;
|
|
|
|
begin
|
|
-- This routine registers a handler as usable for dynamic interrupt
|
|
-- handler association. Routines attaching and detaching handlers
|
|
-- dynamically should determine whether the handler is registered.
|
|
-- Program_Error should be raised if it is not registered.
|
|
|
|
-- Pragma Interrupt_Handler can only appear in a library level PO
|
|
-- definition and instantiation. Therefore, we do not need to implement
|
|
-- an unregister operation. Nor do we need to protect the queue
|
|
-- structure with a lock.
|
|
|
|
pragma Assert (Handler_Addr /= System.Null_Address);
|
|
|
|
New_Node_Ptr := new Registered_Handler;
|
|
New_Node_Ptr.H := Handler_Addr;
|
|
|
|
if Registered_Handler_Head = null then
|
|
Registered_Handler_Head := New_Node_Ptr;
|
|
Registered_Handler_Tail := New_Node_Ptr;
|
|
else
|
|
Registered_Handler_Tail.Next := New_Node_Ptr;
|
|
Registered_Handler_Tail := New_Node_Ptr;
|
|
end if;
|
|
end Register_Interrupt_Handler;
|
|
|
|
-----------------------
|
|
-- Unblock_Interrupt --
|
|
-----------------------
|
|
|
|
procedure Unblock_Interrupt (Interrupt : Interrupt_ID) is
|
|
begin
|
|
Unimplemented ("Unblock_Interrupt");
|
|
end Unblock_Interrupt;
|
|
|
|
------------------
|
|
-- Unblocked_By --
|
|
------------------
|
|
|
|
function Unblocked_By
|
|
(Interrupt : Interrupt_ID) return System.Tasking.Task_Id
|
|
is
|
|
begin
|
|
Unimplemented ("Unblocked_By");
|
|
return Null_Task;
|
|
end Unblocked_By;
|
|
|
|
------------------------
|
|
-- Unignore_Interrupt --
|
|
------------------------
|
|
|
|
procedure Unignore_Interrupt (Interrupt : Interrupt_ID) is
|
|
begin
|
|
Unimplemented ("Unignore_Interrupt");
|
|
end Unignore_Interrupt;
|
|
|
|
-------------------
|
|
-- Unimplemented --
|
|
-------------------
|
|
|
|
procedure Unimplemented (Feature : String) is
|
|
begin
|
|
raise Program_Error with Feature & " not implemented on VxWorks";
|
|
end Unimplemented;
|
|
|
|
-----------------------
|
|
-- Interrupt_Manager --
|
|
-----------------------
|
|
|
|
task body Interrupt_Manager is
|
|
-- By making this task independent of any master, when the process goes
|
|
-- away, the Interrupt_Manager will terminate gracefully.
|
|
|
|
Ignore : constant Boolean := System.Tasking.Utilities.Make_Independent;
|
|
pragma Unreferenced (Ignore);
|
|
|
|
--------------------
|
|
-- Local Routines --
|
|
--------------------
|
|
|
|
procedure Bind_Handler (Interrupt : Interrupt_ID);
|
|
-- This procedure does not do anything if a signal is blocked.
|
|
-- Otherwise, we have to interrupt Server_Task for status change
|
|
-- through a wakeup signal.
|
|
|
|
procedure Unbind_Handler (Interrupt : Interrupt_ID);
|
|
-- This procedure does not do anything if a signal is blocked.
|
|
-- Otherwise, we have to interrupt Server_Task for status change
|
|
-- through an abort signal.
|
|
|
|
procedure Unprotected_Exchange_Handler
|
|
(Old_Handler : out Parameterless_Handler;
|
|
New_Handler : Parameterless_Handler;
|
|
Interrupt : Interrupt_ID;
|
|
Static : Boolean;
|
|
Restoration : Boolean := False);
|
|
|
|
procedure Unprotected_Detach_Handler
|
|
(Interrupt : Interrupt_ID;
|
|
Static : Boolean);
|
|
|
|
------------------
|
|
-- Bind_Handler --
|
|
------------------
|
|
|
|
procedure Bind_Handler (Interrupt : Interrupt_ID) is
|
|
begin
|
|
Install_Umbrella_Handler
|
|
(HW_Interrupt (Interrupt), Notify_Interrupt'Access);
|
|
end Bind_Handler;
|
|
|
|
--------------------
|
|
-- Unbind_Handler --
|
|
--------------------
|
|
|
|
procedure Unbind_Handler (Interrupt : Interrupt_ID) is
|
|
Status : int;
|
|
|
|
begin
|
|
-- Flush server task off semaphore, allowing it to terminate
|
|
|
|
Status := Binary_Semaphore_Flush (Semaphore_ID_Map (Interrupt));
|
|
pragma Assert (Status = 0);
|
|
end Unbind_Handler;
|
|
|
|
--------------------------------
|
|
-- Unprotected_Detach_Handler --
|
|
--------------------------------
|
|
|
|
procedure Unprotected_Detach_Handler
|
|
(Interrupt : Interrupt_ID;
|
|
Static : Boolean)
|
|
is
|
|
Old_Handler : Parameterless_Handler;
|
|
begin
|
|
if User_Entry (Interrupt).T /= Null_Task then
|
|
|
|
-- If an interrupt entry is installed raise Program_Error
|
|
-- (propagate it to the caller).
|
|
|
|
raise Program_Error with
|
|
"an interrupt entry is already installed";
|
|
end if;
|
|
|
|
-- Note : Static = True will pass the following check. This is the
|
|
-- case when we want to detach a handler regardless of the static
|
|
-- status of the Current_Handler.
|
|
|
|
if not Static and then User_Handler (Interrupt).Static then
|
|
|
|
-- Trying to detach a static Interrupt Handler, raise
|
|
-- Program_Error.
|
|
|
|
raise Program_Error with
|
|
"trying to detach a static Interrupt Handler";
|
|
end if;
|
|
|
|
Old_Handler := User_Handler (Interrupt).H;
|
|
|
|
-- The new handler
|
|
|
|
User_Handler (Interrupt).H := null;
|
|
User_Handler (Interrupt).Static := False;
|
|
|
|
if Old_Handler /= null then
|
|
Unbind_Handler (Interrupt);
|
|
end if;
|
|
end Unprotected_Detach_Handler;
|
|
|
|
----------------------------------
|
|
-- Unprotected_Exchange_Handler --
|
|
----------------------------------
|
|
|
|
procedure Unprotected_Exchange_Handler
|
|
(Old_Handler : out Parameterless_Handler;
|
|
New_Handler : Parameterless_Handler;
|
|
Interrupt : Interrupt_ID;
|
|
Static : Boolean;
|
|
Restoration : Boolean := False)
|
|
is
|
|
begin
|
|
if User_Entry (Interrupt).T /= Null_Task then
|
|
|
|
-- If an interrupt entry is already installed, raise
|
|
-- Program_Error (propagate it to the caller).
|
|
|
|
raise Program_Error with "an interrupt is already installed";
|
|
end if;
|
|
|
|
-- Note : A null handler with Static = True will pass the following
|
|
-- check. This is the case when we want to detach a handler
|
|
-- regardless of the Static status of Current_Handler.
|
|
|
|
-- We don't check anything if Restoration is True, since we may be
|
|
-- detaching a static handler to restore a dynamic one.
|
|
|
|
if not Restoration and then not Static
|
|
and then (User_Handler (Interrupt).Static
|
|
|
|
-- Trying to overwrite a static Interrupt Handler with a dynamic
|
|
-- Handler
|
|
|
|
-- The new handler is not specified as an Interrupt Handler by a
|
|
-- pragma.
|
|
|
|
or else not Is_Registered (New_Handler))
|
|
then
|
|
raise Program_Error with
|
|
"trying to overwrite a static interrupt handler with a "
|
|
& "dynamic handler";
|
|
end if;
|
|
|
|
-- Save the old handler
|
|
|
|
Old_Handler := User_Handler (Interrupt).H;
|
|
|
|
-- The new handler
|
|
|
|
User_Handler (Interrupt).H := New_Handler;
|
|
|
|
if New_Handler = null then
|
|
|
|
-- The null handler means we are detaching the handler
|
|
|
|
User_Handler (Interrupt).Static := False;
|
|
|
|
else
|
|
User_Handler (Interrupt).Static := Static;
|
|
end if;
|
|
|
|
-- Invoke a corresponding Server_Task if not yet created. Place
|
|
-- Task_Id info in Server_ID array.
|
|
|
|
if New_Handler /= null
|
|
and then
|
|
(Server_ID (Interrupt) = Null_Task
|
|
or else
|
|
Ada.Task_Identification.Is_Terminated
|
|
(To_Ada (Server_ID (Interrupt))))
|
|
then
|
|
Interrupt_Access_Hold :=
|
|
new Interrupt_Server_Task (Interrupt, Binary_Semaphore_Create);
|
|
Server_ID (Interrupt) :=
|
|
To_System (Interrupt_Access_Hold.all'Identity);
|
|
end if;
|
|
|
|
if (New_Handler = null) and then Old_Handler /= null then
|
|
|
|
-- Restore default handler
|
|
|
|
Unbind_Handler (Interrupt);
|
|
|
|
elsif Old_Handler = null then
|
|
|
|
-- Save default handler
|
|
|
|
Bind_Handler (Interrupt);
|
|
end if;
|
|
end Unprotected_Exchange_Handler;
|
|
|
|
-- Start of processing for Interrupt_Manager
|
|
|
|
begin
|
|
loop
|
|
-- A block is needed to absorb Program_Error exception
|
|
|
|
declare
|
|
Old_Handler : Parameterless_Handler;
|
|
|
|
begin
|
|
select
|
|
accept Attach_Handler
|
|
(New_Handler : Parameterless_Handler;
|
|
Interrupt : Interrupt_ID;
|
|
Static : Boolean;
|
|
Restoration : Boolean := False)
|
|
do
|
|
Unprotected_Exchange_Handler
|
|
(Old_Handler, New_Handler, Interrupt, Static, Restoration);
|
|
end Attach_Handler;
|
|
|
|
or
|
|
accept Exchange_Handler
|
|
(Old_Handler : out Parameterless_Handler;
|
|
New_Handler : Parameterless_Handler;
|
|
Interrupt : Interrupt_ID;
|
|
Static : Boolean)
|
|
do
|
|
Unprotected_Exchange_Handler
|
|
(Old_Handler, New_Handler, Interrupt, Static);
|
|
end Exchange_Handler;
|
|
|
|
or
|
|
accept Detach_Handler
|
|
(Interrupt : Interrupt_ID;
|
|
Static : Boolean)
|
|
do
|
|
Unprotected_Detach_Handler (Interrupt, Static);
|
|
end Detach_Handler;
|
|
|
|
or
|
|
accept Bind_Interrupt_To_Entry
|
|
(T : Task_Id;
|
|
E : Task_Entry_Index;
|
|
Interrupt : Interrupt_ID)
|
|
do
|
|
-- If there is a binding already (either a procedure or an
|
|
-- entry), raise Program_Error (propagate it to the caller).
|
|
|
|
if User_Handler (Interrupt).H /= null
|
|
or else User_Entry (Interrupt).T /= Null_Task
|
|
then
|
|
raise Program_Error with
|
|
"a binding for this interrupt is already present";
|
|
end if;
|
|
|
|
User_Entry (Interrupt) := Entry_Assoc'(T => T, E => E);
|
|
|
|
-- Indicate the attachment of interrupt entry in the ATCB.
|
|
-- This is needed so when an interrupt entry task terminates
|
|
-- the binding can be cleaned. The call to unbinding must be
|
|
-- make by the task before it terminates.
|
|
|
|
T.Interrupt_Entry := True;
|
|
|
|
-- Invoke a corresponding Server_Task if not yet created.
|
|
-- Place Task_Id info in Server_ID array.
|
|
|
|
if Server_ID (Interrupt) = Null_Task
|
|
or else
|
|
Ada.Task_Identification.Is_Terminated
|
|
(To_Ada (Server_ID (Interrupt)))
|
|
then
|
|
Interrupt_Access_Hold := new Interrupt_Server_Task
|
|
(Interrupt, Binary_Semaphore_Create);
|
|
Server_ID (Interrupt) :=
|
|
To_System (Interrupt_Access_Hold.all'Identity);
|
|
end if;
|
|
|
|
Bind_Handler (Interrupt);
|
|
end Bind_Interrupt_To_Entry;
|
|
|
|
or
|
|
accept Detach_Interrupt_Entries (T : Task_Id) do
|
|
for Int in Interrupt_ID'Range loop
|
|
if not Is_Reserved (Int) then
|
|
if User_Entry (Int).T = T then
|
|
User_Entry (Int) :=
|
|
Entry_Assoc'
|
|
(T => Null_Task, E => Null_Task_Entry);
|
|
Unbind_Handler (Int);
|
|
end if;
|
|
end if;
|
|
end loop;
|
|
|
|
-- Indicate in ATCB that no interrupt entries are attached
|
|
|
|
T.Interrupt_Entry := False;
|
|
end Detach_Interrupt_Entries;
|
|
end select;
|
|
|
|
exception
|
|
-- If there is a Program_Error we just want to propagate it to
|
|
-- the caller and do not want to stop this task.
|
|
|
|
when Program_Error =>
|
|
null;
|
|
|
|
when others =>
|
|
pragma Assert (False);
|
|
null;
|
|
end;
|
|
end loop;
|
|
|
|
exception
|
|
when Standard'Abort_Signal =>
|
|
|
|
-- Flush interrupt server semaphores, so they can terminate
|
|
|
|
Finalize_Interrupt_Servers;
|
|
raise;
|
|
end Interrupt_Manager;
|
|
|
|
---------------------------
|
|
-- Interrupt_Server_Task --
|
|
---------------------------
|
|
|
|
-- Server task for vectored hardware interrupt handling
|
|
|
|
task body Interrupt_Server_Task is
|
|
Ignore : constant Boolean := System.Tasking.Utilities.Make_Independent;
|
|
|
|
Self_Id : constant Task_Id := Self;
|
|
Tmp_Handler : Parameterless_Handler;
|
|
Tmp_ID : Task_Id;
|
|
Tmp_Entry_Index : Task_Entry_Index;
|
|
Status : int;
|
|
|
|
begin
|
|
Semaphore_ID_Map (Interrupt) := Int_Sema;
|
|
|
|
loop
|
|
-- Pend on semaphore that will be triggered by the umbrella handler
|
|
-- when the associated interrupt comes in.
|
|
|
|
Status := Binary_Semaphore_Obtain (Int_Sema);
|
|
pragma Assert (Status = 0);
|
|
|
|
if User_Handler (Interrupt).H /= null then
|
|
|
|
-- Protected procedure handler
|
|
|
|
Tmp_Handler := User_Handler (Interrupt).H;
|
|
Tmp_Handler.all;
|
|
|
|
elsif User_Entry (Interrupt).T /= Null_Task then
|
|
|
|
-- Interrupt entry handler
|
|
|
|
Tmp_ID := User_Entry (Interrupt).T;
|
|
Tmp_Entry_Index := User_Entry (Interrupt).E;
|
|
System.Tasking.Rendezvous.Call_Simple
|
|
(Tmp_ID, Tmp_Entry_Index, System.Null_Address);
|
|
|
|
else
|
|
-- Semaphore has been flushed by an unbind operation in the
|
|
-- Interrupt_Manager. Terminate the server task.
|
|
|
|
-- Wait for the Interrupt_Manager to complete its work
|
|
|
|
POP.Write_Lock (Self_Id);
|
|
|
|
-- Unassociate the interrupt handler
|
|
|
|
Semaphore_ID_Map (Interrupt) := 0;
|
|
|
|
-- Delete the associated semaphore
|
|
|
|
Status := Binary_Semaphore_Delete (Int_Sema);
|
|
|
|
pragma Assert (Status = 0);
|
|
|
|
-- Set status for the Interrupt_Manager
|
|
|
|
Server_ID (Interrupt) := Null_Task;
|
|
POP.Unlock (Self_Id);
|
|
|
|
exit;
|
|
end if;
|
|
end loop;
|
|
end Interrupt_Server_Task;
|
|
|
|
begin
|
|
-- Get Interrupt_Manager's ID so that Abort_Interrupt can be sent
|
|
|
|
Interrupt_Manager_ID := To_System (Interrupt_Manager'Identity);
|
|
end System.Interrupts;
|