118 lines
6.1 KiB
Ada
118 lines
6.1 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNU ADA 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 _ M A N A G E M E N T --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2003 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 2, or (at your option) any later ver- --
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-- sion. GNARL 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. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNARL; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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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 package encapsulates and centralizes information about all
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-- uses of interrupts (or signals), including the target-dependent
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-- mapping of interrupts (or signals) to exceptions.
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-- Unlike the original design, System.Interrupt_Management can only
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-- be used for tasking systems.
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-- PLEASE DO NOT remove the Elaborate_Body pragma from this package.
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-- Elaboration of this package should happen early, as most other
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-- initializations depend on it. Forcing immediate elaboration of
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-- the body also helps to enforce the design assumption that this
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-- is a second-level package, just one level above System.OS_Interface
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-- with no cross-dependencies.
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-- PLEASE DO NOT put any subprogram declarations with arguments of
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-- type Interrupt_ID into the visible part of this package. The type
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-- Interrupt_ID is used to derive the type in Ada.Interrupts, and
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-- adding more operations to that type would be illegal according
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-- to the Ada Reference Manual. This is the reason why the signals
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-- sets are implemeneted using visible arrays rather than functions.
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with System.OS_Interface;
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-- used for sigset_t
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with Interfaces.C;
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-- used for int
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package System.Interrupt_Management is
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pragma Elaborate_Body;
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type Interrupt_Mask is limited private;
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type Interrupt_ID is new Interfaces.C.int
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range 0 .. System.OS_Interface.Max_Interrupt;
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type Interrupt_Set is array (Interrupt_ID) of Boolean;
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-- The following objects serve as constants, but are initialized
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-- in the body to aid portability. This permits us to use more
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-- portable names for interrupts, where distinct names may map to
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-- the same interrupt ID value.
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--
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-- For example, suppose SIGRARE is a signal that is not defined on
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-- all systems, but is always reserved when it is defined. If we
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-- have the convention that ID zero is not used for any "real"
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-- signals, and SIGRARE = 0 when SIGRARE is not one of the locally
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-- supported signals, we can write
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-- Reserved (SIGRARE) := true;
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-- and the initialization code will be portable.
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Abort_Task_Interrupt : Interrupt_ID;
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-- The interrupt that is used to implement task abortion if
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-- an interrupt is used for that purpose. This is one of the
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-- reserved interrupts.
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Keep_Unmasked : Interrupt_Set := (others => False);
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-- Keep_Unmasked (I) is true iff the interrupt I is one that must
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-- that must be kept unmasked at all times, except (perhaps) for
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-- short critical sections. This includes interrupts that are
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-- mapped to exceptions (see System.Interrupt_Exceptions.Is_Exception),
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-- but may also include interrupts (e.g. timer) that need to be kept
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-- unmasked for other reasons. Where interrupts are implemented as
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-- OS signals, and signal masking is per-task, the interrupt should
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-- be unmasked in ALL TASKS.
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Reserve : Interrupt_Set := (others => False);
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-- Reserve (I) is true iff the interrupt I is one that cannot be
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-- permitted to be attached to a user handler. The possible reasons
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-- are many. For example, it may be mapped to an exception used to
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-- implement task abortion, or used to implement time delays.
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procedure Initialize_Interrupts;
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-- On systems where there is no signal inheritance between tasks (e.g
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-- VxWorks, GNU/LinuxThreads), this procedure is used to initialize
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-- interrupts handling in each task. Otherwise this function should
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-- only be called by initialize in this package body.
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private
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type Interrupt_Mask is new System.OS_Interface.sigset_t;
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-- In some implementation Interrupt_Mask can be represented
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-- as a linked list.
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end System.Interrupt_Management;
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