--- /dev/null
+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- --
+-- S Y S T E M . I N T E R R U P T S --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1992-2014, Free Software Foundation, Inc. --
+-- --
+-- GNARL is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNARL was developed by the GNARL team at Florida State University. --
+-- Extensive contributions were provided by Ada Core Technologies, Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- Invariants:
+
+-- All user-handlable signals are masked at all times in all tasks/threads
+-- except possibly for the Interrupt_Manager task.
+
+-- When a user task wants to have the effect of masking/unmasking an signal,
+-- it must call Block_Interrupt/Unblock_Interrupt, which will have the effect
+-- of unmasking/masking the signal in the Interrupt_Manager task. These
+-- comments do not apply to vectored hardware interrupts, which may be masked
+-- or unmasked using routined interfaced to the relevant embedded RTOS system
+-- calls.
+
+-- Once we associate a Signal_Server_Task with an signal, the task never goes
+-- away, and we never remove the association. On the other hand, it is more
+-- convenient to terminate an associated Interrupt_Server_Task for a vectored
+-- hardware interrupt (since we use a binary semaphore for synchronization
+-- with the umbrella handler).
+
+-- There is no more than one signal per Signal_Server_Task and no more than
+-- one Signal_Server_Task per signal. The same relation holds for hardware
+-- interrupts and Interrupt_Server_Task's at any given time. That is, only
+-- one non-terminated Interrupt_Server_Task exists for a give interrupt at
+-- any time.
+
+-- Within this package, the lock L is used to protect the various status
+-- tables. If there is a Server_Task associated with a signal or interrupt,
+-- we use the per-task lock of the Server_Task instead so that we protect the
+-- status between Interrupt_Manager and Server_Task. Protection among service
+-- requests are ensured via user calls to the Interrupt_Manager entries.
+
+-- This is reasonably generic version of this package, supporting vectored
+-- hardware interrupts using non-RTOS specific adapter routines which should
+-- easily implemented on any RTOS capable of supporting GNAT.
+
+with Ada.Unchecked_Conversion;
+with Ada.Task_Identification;
+
+with Interfaces.C; use Interfaces.C;
+with System.OS_Interface; use System.OS_Interface;
+with System.Interrupt_Management;
+with System.Task_Primitives.Operations;
+with System.Storage_Elements;
+with System.Tasking.Utilities;
+
+with System.Tasking.Rendezvous;
+pragma Elaborate_All (System.Tasking.Rendezvous);
+
+package body System.Interrupts is
+
+ use Tasking;
+
+ package POP renames System.Task_Primitives.Operations;
+
+ function To_Ada is new Ada.Unchecked_Conversion
+ (System.Tasking.Task_Id, Ada.Task_Identification.Task_Id);
+
+ function To_System is new Ada.Unchecked_Conversion
+ (Ada.Task_Identification.Task_Id, Task_Id);
+
+ -----------------
+ -- Local Tasks --
+ -----------------
+
+ -- WARNING: System.Tasking.Stages performs calls to this task with low-
+ -- level constructs. Do not change this spec without synchronizing it.
+
+ task Interrupt_Manager is
+ entry Detach_Interrupt_Entries (T : Task_Id);
+
+ entry Attach_Handler
+ (New_Handler : Parameterless_Handler;
+ Interrupt : Interrupt_ID;
+ Static : Boolean;
+ Restoration : Boolean := False);
+
+ entry Exchange_Handler
+ (Old_Handler : out Parameterless_Handler;
+ New_Handler : Parameterless_Handler;
+ Interrupt : Interrupt_ID;
+ Static : Boolean);
+
+ entry Detach_Handler
+ (Interrupt : Interrupt_ID;
+ Static : Boolean);
+
+ entry Bind_Interrupt_To_Entry
+ (T : Task_Id;
+ E : Task_Entry_Index;
+ Interrupt : Interrupt_ID);
+
+ pragma Interrupt_Priority (System.Interrupt_Priority'First);
+ end Interrupt_Manager;
+
+ task type Interrupt_Server_Task
+ (Interrupt : Interrupt_ID;
+ Int_Sema : Binary_Semaphore_Id)
+ is
+ -- Server task for vectored hardware interrupt handling
+
+ pragma Interrupt_Priority (System.Interrupt_Priority'First + 2);
+ end Interrupt_Server_Task;
+
+ type Interrupt_Task_Access is access Interrupt_Server_Task;
+
+ -------------------------------
+ -- Local Types and Variables --
+ -------------------------------
+
+ type Entry_Assoc is record
+ T : Task_Id;
+ E : Task_Entry_Index;
+ end record;
+
+ type Handler_Assoc is record
+ H : Parameterless_Handler;
+ Static : Boolean; -- Indicates static binding;
+ end record;
+
+ User_Handler : array (Interrupt_ID) of Handler_Assoc :=
+ (others => (null, Static => False));
+ pragma Volatile_Components (User_Handler);
+ -- Holds the protected procedure handler (if any) and its Static
+ -- information for each interrupt or signal. A handler is static iff it
+ -- is specified through the pragma Attach_Handler.
+
+ User_Entry : array (Interrupt_ID) of Entry_Assoc :=
+ (others => (T => Null_Task, E => Null_Task_Entry));
+ pragma Volatile_Components (User_Entry);
+ -- Holds the task and entry index (if any) for each interrupt / signal
+
+ -- Type and Head, Tail of the list containing Registered Interrupt
+ -- Handlers. These definitions are used to register the handlers
+ -- specified by the pragma Interrupt_Handler.
+
+ type Registered_Handler;
+ type R_Link is access all Registered_Handler;
+
+ type Registered_Handler is record
+ H : System.Address := System.Null_Address;
+ Next : R_Link := null;
+ end record;
+
+ Registered_Handler_Head : R_Link := null;
+ Registered_Handler_Tail : R_Link := null;
+
+ Server_ID : array (Interrupt_ID) of System.Tasking.Task_Id :=
+ (others => System.Tasking.Null_Task);
+ pragma Atomic_Components (Server_ID);
+ -- Holds the Task_Id of the Server_Task for each interrupt / signal.
+ -- Task_Id is needed to accomplish locking per interrupt base. Also
+ -- is needed to determine whether to create a new Server_Task.
+
+ Semaphore_ID_Map : array
+ (Interrupt_ID range 0 .. System.OS_Interface.Max_HW_Interrupt) of
+ Binary_Semaphore_Id := (others => 0);
+ -- Array of binary semaphores associated with vectored interrupts. Note
+ -- that the last bound should be Max_HW_Interrupt, but this will raise
+ -- Storage_Error if Num_HW_Interrupts is null so use extra 4 bytes instead.
+
+ Interrupt_Access_Hold : Interrupt_Task_Access;
+ -- Variable for allocating an Interrupt_Server_Task
+
+ Handler_Installed : array (HW_Interrupt) of Boolean := (others => False);
+ -- True if Notify_Interrupt was connected to the interrupt. Handlers can
+ -- be connected but disconnection is not possible on VxWorks. Therefore
+ -- we ensure Notify_Installed is connected at most once.
+
+ -----------------------
+ -- Local Subprograms --
+ -----------------------
+
+ procedure Check_Reserved_Interrupt (Interrupt : Interrupt_ID);
+ -- Check if Id is a reserved interrupt, and if so raise Program_Error
+ -- with an appropriate message, otherwise return.
+
+ procedure Finalize_Interrupt_Servers;
+ -- Unbind the handlers for hardware interrupt server tasks at program
+ -- termination.
+
+ function Is_Registered (Handler : Parameterless_Handler) return Boolean;
+ -- See if Handler has been "pragma"ed using Interrupt_Handler.
+ -- Always consider a null handler as registered.
+
+ procedure Notify_Interrupt (Param : System.Address);
+ pragma Convention (C, Notify_Interrupt);
+ -- Umbrella handler for vectored interrupts (not signals)
+
+ procedure Install_Umbrella_Handler
+ (Interrupt : HW_Interrupt;
+ Handler : System.OS_Interface.Interrupt_Handler);
+ -- Install the runtime umbrella handler for a vectored hardware
+ -- interrupt
+
+ procedure Unimplemented (Feature : String);
+ pragma No_Return (Unimplemented);
+ -- Used to mark a call to an unimplemented function. Raises Program_Error
+ -- with an appropriate message noting that Feature is unimplemented.
+
+ --------------------
+ -- Attach_Handler --
+ --------------------
+
+ -- Calling this procedure with New_Handler = null and Static = True
+ -- means we want to detach the current handler regardless of the previous
+ -- handler's binding status (i.e. do not care if it is a dynamic or static
+ -- handler).
+
+ -- This option is needed so that during the finalization of a PO, we can
+ -- detach handlers attached through pragma Attach_Handler.
+
+ procedure Attach_Handler
+ (New_Handler : Parameterless_Handler;
+ Interrupt : Interrupt_ID;
+ Static : Boolean := False) is
+ begin
+ Check_Reserved_Interrupt (Interrupt);
+ Interrupt_Manager.Attach_Handler (New_Handler, Interrupt, Static);
+ end Attach_Handler;
+
+ -----------------------------
+ -- Bind_Interrupt_To_Entry --
+ -----------------------------
+
+ -- This procedure raises a Program_Error if it tries to
+ -- bind an interrupt to which an Entry or a Procedure is
+ -- already bound.
+
+ procedure Bind_Interrupt_To_Entry
+ (T : Task_Id;
+ E : Task_Entry_Index;
+ Int_Ref : System.Address)
+ is
+ Interrupt : constant Interrupt_ID :=
+ Interrupt_ID (Storage_Elements.To_Integer (Int_Ref));
+ begin
+ Check_Reserved_Interrupt (Interrupt);
+ Interrupt_Manager.Bind_Interrupt_To_Entry (T, E, Interrupt);
+ end Bind_Interrupt_To_Entry;
+
+ ---------------------
+ -- Block_Interrupt --
+ ---------------------
+
+ procedure Block_Interrupt (Interrupt : Interrupt_ID) is
+ begin
+ Unimplemented ("Block_Interrupt");
+ end Block_Interrupt;
+
+ ------------------------------
+ -- Check_Reserved_Interrupt --
+ ------------------------------
+
+ procedure Check_Reserved_Interrupt (Interrupt : Interrupt_ID) is
+ begin
+ if Is_Reserved (Interrupt) then
+ raise Program_Error with
+ "interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved";
+ else
+ return;
+ end if;
+ end Check_Reserved_Interrupt;
+
+ ---------------------
+ -- Current_Handler --
+ ---------------------
+
+ function Current_Handler
+ (Interrupt : Interrupt_ID) return Parameterless_Handler
+ is
+ begin
+ Check_Reserved_Interrupt (Interrupt);
+
+ -- ??? Since Parameterless_Handler is not Atomic, the current
+ -- implementation is wrong. We need a new service in Interrupt_Manager
+ -- to ensure atomicity.
+
+ return User_Handler (Interrupt).H;
+ end Current_Handler;
+
+ --------------------
+ -- Detach_Handler --
+ --------------------
+
+ -- Calling this procedure with Static = True means we want to Detach the
+ -- current handler regardless of the previous handler's binding status
+ -- (i.e. do not care if it is a dynamic or static handler).
+
+ -- This option is needed so that during the finalization of a PO, we can
+ -- detach handlers attached through pragma Attach_Handler.
+
+ procedure Detach_Handler
+ (Interrupt : Interrupt_ID;
+ Static : Boolean := False)
+ is
+ begin
+ Check_Reserved_Interrupt (Interrupt);
+ Interrupt_Manager.Detach_Handler (Interrupt, Static);
+ end Detach_Handler;
+
+ ------------------------------
+ -- Detach_Interrupt_Entries --
+ ------------------------------
+
+ procedure Detach_Interrupt_Entries (T : Task_Id) is
+ begin
+ Interrupt_Manager.Detach_Interrupt_Entries (T);
+ end Detach_Interrupt_Entries;
+
+ ----------------------
+ -- Exchange_Handler --
+ ----------------------
+
+ -- Calling this procedure with New_Handler = null and Static = True
+ -- means we want to detach the current handler regardless of the previous
+ -- handler's binding status (i.e. we do not care if it is a dynamic or
+ -- static handler).
+
+ -- This option is needed so that during the finalization of a PO, we can
+ -- detach handlers attached through pragma Attach_Handler.
+
+ procedure Exchange_Handler
+ (Old_Handler : out Parameterless_Handler;
+ New_Handler : Parameterless_Handler;
+ Interrupt : Interrupt_ID;
+ Static : Boolean := False)
+ is
+ begin
+ Check_Reserved_Interrupt (Interrupt);
+ Interrupt_Manager.Exchange_Handler
+ (Old_Handler, New_Handler, Interrupt, Static);
+ end Exchange_Handler;
+
+ --------------
+ -- Finalize --
+ --------------
+
+ procedure Finalize (Object : in out Static_Interrupt_Protection) is
+ begin
+ -- ??? loop to be executed only when we're not doing library level
+ -- finalization, since in this case all interrupt / signal tasks are
+ -- gone.
+
+ if not Interrupt_Manager'Terminated then
+ for N in reverse Object.Previous_Handlers'Range loop
+ Interrupt_Manager.Attach_Handler
+ (New_Handler => Object.Previous_Handlers (N).Handler,
+ Interrupt => Object.Previous_Handlers (N).Interrupt,
+ Static => Object.Previous_Handlers (N).Static,
+ Restoration => True);
+ end loop;
+ end if;
+
+ Tasking.Protected_Objects.Entries.Finalize
+ (Tasking.Protected_Objects.Entries.Protection_Entries (Object));
+ end Finalize;
+
+ --------------------------------
+ -- Finalize_Interrupt_Servers --
+ --------------------------------
+
+ -- Restore default handlers for interrupt servers
+
+ -- This is called by the Interrupt_Manager task when it receives the abort
+ -- signal during program finalization.
+
+ procedure Finalize_Interrupt_Servers is
+ HW_Interrupts : constant Boolean := HW_Interrupt'Last >= 0;
+ begin
+ if HW_Interrupts then
+ for Int in HW_Interrupt loop
+ if Server_ID (Interrupt_ID (Int)) /= null
+ and then
+ not Ada.Task_Identification.Is_Terminated
+ (To_Ada (Server_ID (Interrupt_ID (Int))))
+ then
+ Interrupt_Manager.Attach_Handler
+ (New_Handler => null,
+ Interrupt => Interrupt_ID (Int),
+ Static => True,
+ Restoration => True);
+ end if;
+ end loop;
+ end if;
+ end Finalize_Interrupt_Servers;
+
+ -------------------------------------
+ -- Has_Interrupt_Or_Attach_Handler --
+ -------------------------------------
+
+ function Has_Interrupt_Or_Attach_Handler
+ (Object : access Dynamic_Interrupt_Protection)
+ return Boolean
+ is
+ pragma Unreferenced (Object);
+ begin
+ return True;
+ end Has_Interrupt_Or_Attach_Handler;
+
+ function Has_Interrupt_Or_Attach_Handler
+ (Object : access Static_Interrupt_Protection)
+ return Boolean
+ is
+ pragma Unreferenced (Object);
+ begin
+ return True;
+ end Has_Interrupt_Or_Attach_Handler;
+
+ ----------------------
+ -- Ignore_Interrupt --
+ ----------------------
+
+ procedure Ignore_Interrupt (Interrupt : Interrupt_ID) is
+ begin
+ Unimplemented ("Ignore_Interrupt");
+ end Ignore_Interrupt;
+
+ ----------------------
+ -- Install_Handlers --
+ ----------------------
+
+ procedure Install_Handlers
+ (Object : access Static_Interrupt_Protection;
+ New_Handlers : New_Handler_Array)
+ is
+ begin
+ for N in New_Handlers'Range loop
+
+ -- We need a lock around this ???
+
+ Object.Previous_Handlers (N).Interrupt := New_Handlers (N).Interrupt;
+ Object.Previous_Handlers (N).Static := User_Handler
+ (New_Handlers (N).Interrupt).Static;
+
+ -- We call Exchange_Handler and not directly Interrupt_Manager.
+ -- Exchange_Handler so we get the Is_Reserved check.
+
+ Exchange_Handler
+ (Old_Handler => Object.Previous_Handlers (N).Handler,
+ New_Handler => New_Handlers (N).Handler,
+ Interrupt => New_Handlers (N).Interrupt,
+ Static => True);
+ end loop;
+ end Install_Handlers;
+
+ ---------------------------------
+ -- Install_Restricted_Handlers --
+ ---------------------------------
+
+ procedure Install_Restricted_Handlers
+ (Prio : Any_Priority;
+ Handlers : New_Handler_Array)
+ is
+ pragma Unreferenced (Prio);
+ begin
+ for N in Handlers'Range loop
+ Attach_Handler (Handlers (N).Handler, Handlers (N).Interrupt, True);
+ end loop;
+ end Install_Restricted_Handlers;
+
+ ------------------------------
+ -- Install_Umbrella_Handler --
+ ------------------------------
+
+ procedure Install_Umbrella_Handler
+ (Interrupt : HW_Interrupt;
+ Handler : System.OS_Interface.Interrupt_Handler)
+ is
+ Vec : constant Interrupt_Vector :=
+ Interrupt_Number_To_Vector (int (Interrupt));
+
+ Status : int;
+
+ begin
+ -- Only install umbrella handler when no Ada handler has already been
+ -- installed. Note that the interrupt number is passed as a parameter
+ -- when an interrupt occurs, so the umbrella handler has a different
+ -- wrapper generated by intConnect for each interrupt number.
+
+ if not Handler_Installed (Interrupt) then
+ Status :=
+ Interrupt_Connect (Vec, Handler, System.Address (Interrupt));
+ pragma Assert (Status = 0);
+
+ Handler_Installed (Interrupt) := True;
+ end if;
+ end Install_Umbrella_Handler;
+
+ ----------------
+ -- Is_Blocked --
+ ----------------
+
+ function Is_Blocked (Interrupt : Interrupt_ID) return Boolean is
+ begin
+ Unimplemented ("Is_Blocked");
+ return False;
+ end Is_Blocked;
+
+ -----------------------
+ -- Is_Entry_Attached --
+ -----------------------
+
+ function Is_Entry_Attached (Interrupt : Interrupt_ID) return Boolean is
+ begin
+ Check_Reserved_Interrupt (Interrupt);
+ return User_Entry (Interrupt).T /= Null_Task;
+ end Is_Entry_Attached;
+
+ -------------------------
+ -- Is_Handler_Attached --
+ -------------------------
+
+ function Is_Handler_Attached (Interrupt : Interrupt_ID) return Boolean is
+ begin
+ Check_Reserved_Interrupt (Interrupt);
+ return User_Handler (Interrupt).H /= null;
+ 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 Fat_Ptr is record
+ Object_Addr : System.Address;
+ Handler_Addr : System.Address;
+ 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 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;
projects / gcc.git / commitdiff