+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
--- --
--- S Y S T E M . I N T E R R U P T _ M A N A G E M E N T --
--- --
--- S p e c --
--- --
--- $Revision: 1.2.12.1 $
--- --
--- Copyright (C) 1991-2001 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 2, or (at your option) any later ver- --
--- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNARL; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNARL was developed by the GNARL team at Florida State University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
---
--- This is the Alpha/VMS version of this package.
---
--- This package encapsulates and centralizes information about
--- all uses of interrupts (or signals), including the
--- target-dependent mapping of interrupts (or signals) to exceptions.
-
--- PLEASE DO NOT add any with-clauses to this package.
--- This is designed to work for both tasking and non-tasking systems,
--- without pulling in any of the tasking support.
-
--- PLEASE DO NOT remove the Elaborate_Body pragma from this package.
--- Elaboration of this package should happen early, as most other
--- initializations depend on it.
--- Forcing immediate elaboration of the body also helps to enforce
--- the design assumption that this is a second-level
--- package, just one level above System.OS_Interface, with no
--- cross-dependences.
-
--- PLEASE DO NOT put any subprogram declarations with arguments of
--- type Interrupt_ID into the visible part of this package.
--- The type Interrupt_ID is used to derive the type in Ada.Interrupts,
--- and adding more operations to that type would be illegal according
--- to the Ada Reference Manual. (This is the reason why the signals sets
--- below are implemented as visible arrays rather than functions.)
-
-with System.OS_Interface;
--- used for Signal
--- sigset_t
-
-package System.Interrupt_Management is
-
- pragma Elaborate_Body;
-
- type Interrupt_Mask is limited private;
-
- type Interrupt_ID is new System.OS_Interface.Signal;
-
- type Interrupt_Set is array (Interrupt_ID) of Boolean;
-
- -- The following objects serve as constants, but are initialized
- -- in the body to aid portability. This permits us
- -- to use more portable names for interrupts,
- -- where distinct names may map to the same interrupt ID value.
- -- For example, suppose SIGRARE is a signal that is not defined on
- -- all systems, but is always reserved when it is defined.
- -- If we have the convention that ID zero is not used for any "real"
- -- signals, and SIGRARE = 0 when SIGRARE is not one of the locally
- -- supported signals, we can write
- -- Reserved (SIGRARE) := true;
- -- and the initialization code will be portable.
-
- Abort_Task_Interrupt : Interrupt_ID;
- -- The interrupt that is used to implement task abortion,
- -- if an interrupt is used for that purpose.
- -- This is one of the reserved interrupts.
-
- Keep_Unmasked : Interrupt_Set := (others => False);
- -- Keep_Unmasked (I) is true iff the interrupt I is
- -- one that must be kept unmasked at all times,
- -- except (perhaps) for short critical sections.
- -- This includes interrupts that are mapped to exceptions
- -- (see System.Interrupt_Exceptions.Is_Exception), but may also
- -- include interrupts (e.g. timer) that need to be kept unmasked
- -- for other reasons.
- -- Where interrupts are implemented as OS signals, and signal masking
- -- is per-task, the interrupt should be unmasked in ALL TASKS.
-
- Reserve : Interrupt_Set := (others => False);
- -- Reserve (I) is true iff the interrupt I is one that
- -- cannot be permitted to be attached to a user handler.
- -- The possible reasons are many. For example,
- -- it may be mapped to an exception, used to implement task abortion,
- -- or used to implement time delays.
-
- Keep_Masked : Interrupt_Set := (others => False);
- -- Keep_Masked (I) is true iff the interrupt I must always be masked.
- -- Where interrupts are implemented as OS signals, and signal masking
- -- is per-task, the interrupt should be masked in ALL TASKS.
- -- There might not be any interrupts in this class, depending on
- -- the environment. For example, if interrupts are OS signals
- -- and signal masking is per-task, use of the sigwait operation
- -- requires the signal be masked in all tasks.
-
- procedure Initialize_Interrupts;
- -- On systems where there is no signal inheritance between tasks (e.g
- -- VxWorks, GNU/LinuxThreads), this procedure is used to initialize
- -- interrupts handling in each task. Otherwise this function should
- -- only be called by initialize in this package body.
-
-private
-
- use type System.OS_Interface.unsigned_long;
-
- type Interrupt_Mask is new System.OS_Interface.sigset_t;
-
- -- Interrupts on VMS are implemented with a mailbox. A QIO read is
- -- registered on the Rcv channel and the interrupt occurs by registering
- -- a QIO write on the Snd channel. The maximum number of pending
- -- interrupts is arbitrarily set at 1000. One nice feature of using
- -- a mailbox is that it is trivially extendable to cross process
- -- interrupts.
-
- Rcv_Interrupt_Chan : System.OS_Interface.unsigned_short := 0;
- Snd_Interrupt_Chan : System.OS_Interface.unsigned_short := 0;
- Interrupt_Mailbox : Interrupt_ID := 0;
- Interrupt_Bufquo : System.OS_Interface.unsigned_long
- := 1000 * (Interrupt_ID'Size / 8);
-
-end System.Interrupt_Management;
projects / msp430-gcc.git / blobdiff