1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- 4-- -- 5-- 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 -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1992-2011, Free Software Foundation, Inc. -- 10-- -- 11-- GNARL is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNARL was developed by the GNARL team at Florida State University. -- 28-- Extensive contributions were provided by Ada Core Technologies, Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32-- This is the VxWorks version of this package 33 34-- This package encapsulates and centralizes information about all 35-- uses of interrupts (or signals), including the target-dependent 36-- mapping of interrupts (or signals) to exceptions. 37 38-- Unlike the original design, System.Interrupt_Management can only 39-- be used for tasking systems. 40 41-- PLEASE DO NOT put any subprogram declarations with arguments of 42-- type Interrupt_ID into the visible part of this package. The type 43-- Interrupt_ID is used to derive the type in Ada.Interrupts, and 44-- adding more operations to that type would be illegal according 45-- to the Ada Reference Manual. This is the reason why the signals 46-- sets are implemented using visible arrays rather than functions. 47 48with System.OS_Interface; 49 50with Interfaces.C; 51 52package System.Interrupt_Management is 53 pragma Preelaborate; 54 55 type Interrupt_Mask is limited private; 56 57 type Interrupt_ID is new Interfaces.C.int 58 range 0 .. System.OS_Interface.Max_Interrupt; 59 60 type Interrupt_Set is array (Interrupt_ID) of Boolean; 61 62 subtype Signal_ID is Interrupt_ID range 0 .. System.OS_Interface.NSIG - 1; 63 64 type Signal_Set is array (Signal_ID) of Boolean; 65 66 -- The following objects serve as constants, but are initialized in the 67 -- body to aid portability. This permits us to use more portable names for 68 -- interrupts, where distinct names may map to the same interrupt ID 69 -- value. 70 71 -- For example, suppose SIGRARE is a signal that is not defined on all 72 -- systems, but is always reserved when it is defined. If we have the 73 -- convention that ID zero is not used for any "real" signals, and SIGRARE 74 -- = 0 when SIGRARE is not one of the locally supported signals, we can 75 -- write: 76 -- Reserved (SIGRARE) := True; 77 -- and the initialization code will be portable. 78 79 Abort_Task_Interrupt : Signal_ID; 80 -- The signal that is used to implement task abort if an interrupt is used 81 -- for that purpose. This is one of the reserved signals. 82 83 Reserve : Interrupt_Set := (others => False); 84 -- Reserve (I) is true iff the interrupt I is one that cannot be permitted 85 -- to be attached to a user handler. The possible reasons are many. For 86 -- example, it may be mapped to an exception used to implement task abort, 87 -- or used to implement time delays. 88 89 procedure Initialize_Interrupts; 90 pragma Import (C, Initialize_Interrupts, "__gnat_install_handler"); 91 -- Under VxWorks, there is no signal inheritance between tasks. 92 -- This procedure is used to initialize signal-to-exception mapping in 93 -- each task. 94 95 procedure Initialize; 96 -- Initialize the various variables defined in this package. This procedure 97 -- must be called before accessing any object from this package and can be 98 -- called multiple times (only the first call has any effect). 99 100private 101 type Interrupt_Mask is new System.OS_Interface.sigset_t; 102 -- In some implementation Interrupt_Mask can be represented as a linked 103 -- list. 104 105end System.Interrupt_Management; 106