diff options
Diffstat (limited to 'gcc/ada/s-intman-vxworks.ads')
| -rw-r--r-- | gcc/ada/s-intman-vxworks.ads | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/gcc/ada/s-intman-vxworks.ads b/gcc/ada/s-intman-vxworks.ads new file mode 100644 index 000000000..5614553c7 --- /dev/null +++ b/gcc/ada/s-intman-vxworks.ads @@ -0,0 +1,112 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT 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 -- +-- -- +-- Copyright (C) 1992-2010, 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. -- +-- -- +------------------------------------------------------------------------------ + +-- This is the VxWorks 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. + +-- Unlike the original design, System.Interrupt_Management can only +-- be used for tasking systems. + +-- 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 are implemented using visible arrays rather than functions. + +with System.OS_Interface; + +with Interfaces.C; + +package System.Interrupt_Management is + pragma Preelaborate; + + type Interrupt_Mask is limited private; + + type Interrupt_ID is new Interfaces.C.int + range 0 .. System.OS_Interface.Max_Interrupt; + + type Interrupt_Set is array (Interrupt_ID) of Boolean; + + subtype Signal_ID is Interrupt_ID range 0 .. System.OS_Interface.NSIG - 1; + + type Signal_Set is array (Signal_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 : Signal_ID; + -- The signal that is used to implement task abort if an interrupt is used + -- for that purpose. This is one of the reserved signals. + + Keep_Unmasked : Signal_Set := (others => False); + -- Keep_Unmasked (I) is true iff the signal I is one that must that must + -- be kept unmasked at all times, except (perhaps) for short critical + -- sections. This includes signals that are mapped to exceptions, but may + -- also include interrupts (e.g. timer) that need to be kept unmasked for + -- other reasons. Where signal masking is per-task, the signal 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 abort, + -- or used to implement time delays. + + procedure Initialize_Interrupts; + -- Under VxWorks, there is no signal inheritance between tasks. + -- This procedure is used to initialize signal-to-exception mapping in + -- each task. + + procedure Initialize; + -- Initialize the various variables defined in this package. This procedure + -- must be called before accessing any object from this package and can be + -- called multiple times (only the first call has any effect). + +private + type Interrupt_Mask is new System.OS_Interface.sigset_t; + -- In some implementation Interrupt_Mask can be represented as a linked + -- list. + +end System.Interrupt_Management; |