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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- I N T E R F A C E S . V X W O R K S --
-- --
-- S p e c --
-- --
-- Copyright (C) 1999-2005, AdaCore --
-- --
-- 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, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, 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 package provides a limited binding to the VxWorks API
-- In particular, it interfaces with the VxWorks hardware interrupt
-- facilities, allowing the use of low-latency direct-vectored
-- interrupt handlers. Note that such handlers have a variety of
-- restrictions regarding system calls and language constructs. In particular,
-- the use of exception handlers and functions returning variable-length
-- objects cannot be used. Less restrictive, but higher-latency handlers can
-- be written using Ada protected procedures, Ada 83 style interrupt entries,
-- or by signalling an Ada task from within an interrupt handler using a
-- binary semaphore as described in the VxWorks Programmer's Manual.
--
-- For complete documentation of the operations in this package, please
-- consult the VxWorks Programmer's Manual and VxWorks Reference Manual.
with System.VxWorks;
package Interfaces.VxWorks is
pragma Preelaborate;
------------------------------------------------------------------------
-- Here is a complete example that shows how to handle the Interrupt 0x14
-- with a direct-vectored interrupt handler in Ada using this package:
-- with Interfaces.VxWorks; use Interfaces.VxWorks;
-- with System;
--
-- package P is
--
-- Count : Integer;
-- pragma Atomic (Count);
--
-- Level : constant := 1;
-- -- Interrupt level used by this example
--
-- procedure Handler (parameter : System.Address);
--
-- end P;
--
-- package body P is
--
-- procedure Handler (parameter : System.Address) is
-- S : STATUS;
-- begin
-- Count := Count + 1;
-- logMsg ("received an interrupt" & ASCII.LF & ASCII.Nul);
--
-- -- Acknowledge VME interrupt
-- S := sysBusIntAck (intLevel => Level);
-- end Handler;
-- end P;
--
-- with Interfaces.VxWorks; use Interfaces.VxWorks;
-- with Ada.Text_IO; use Ada.Text_IO;
--
-- with P; use P;
-- procedure Useint is
-- -- Be sure to use a reasonable interrupt number for the target
-- -- board!
-- -- This one is the unused VME graphics interrupt on the PPC MV2604
-- Interrupt : constant := 16#14#;
--
-- task T;
--
-- S : STATUS;
--
-- task body T is
-- begin
-- loop
-- Put_Line ("Generating an interrupt...");
-- delay 1.0;
--
-- -- Generate VME interrupt, using interrupt number
-- S := sysBusIntGen (1, Interrupt);
-- end loop;
-- end T;
--
-- begin
-- S := sysIntEnable (intLevel => Level);
-- S := intConnect (INUM_TO_IVEC (Interrupt), handler'Access);
--
-- loop
-- delay 2.0;
-- Put_Line ("value of count:" & P.Count'Img);
-- end loop;
-- end Useint;
-------------------------------------
subtype int is Integer;
type STATUS is new int;
-- Equivalent of the C type STATUS
OK : constant STATUS := 0;
ERROR : constant STATUS := -1;
type VOIDFUNCPTR is access procedure (parameter : System.Address);
type Interrupt_Vector is new System.Address;
type Exception_Vector is new System.Address;
function intConnect
(vector : Interrupt_Vector;
handler : VOIDFUNCPTR;
parameter : System.Address := System.Null_Address) return STATUS;
-- Binding to the C routine intConnect. Use this to set up an
-- user handler. The routine generates a wrapper around the user
-- handler to save and restore context
function intContext return int;
-- Binding to the C routine intContext. This function returns 1 only
-- if the current execution state is in interrupt context.
function intVecGet
(Vector : Interrupt_Vector) return VOIDFUNCPTR;
-- Binding to the C routine intVecGet. Use this to get the
-- existing handler for later restoral
procedure intVecSet
(Vector : Interrupt_Vector;
Handler : VOIDFUNCPTR);
-- Binding to the C routine intVecSet. Use this to restore a
-- handler obtained using intVecGet
function INUM_TO_IVEC (intNum : int) return Interrupt_Vector;
-- Equivalent to the C macro INUM_TO_IVEC used to convert an interrupt
-- number to an interrupt vector
function sysIntEnable (intLevel : int) return STATUS;
-- Binding to the C routine sysIntEnable
function sysIntDisable (intLevel : int) return STATUS;
-- Binding to the C routine sysIntDisable
function sysBusIntAck (intLevel : int) return STATUS;
-- Binding to the C routine sysBusIntAck
function sysBusIntGen (intLevel : int; Intnum : int) return STATUS;
-- Binding to the C routine sysBusIntGen. Note that the T2
-- documentation implies that a vector address is the proper
-- argument - it's not. The interrupt number in the range
-- 0 .. 255 (for 68K and PPC) is the correct agument.
procedure logMsg
(fmt : String; arg1, arg2, arg3, arg4, arg5, arg6 : int := 0);
-- Binding to the C routine logMsg. Note that it is the caller's
-- responsibility to ensure that fmt is a null-terminated string
-- (e.g logMsg ("Interrupt" & ASCII.NUL))
type FP_CONTEXT is private;
-- Floating point context save and restore. Handlers using floating
-- point must be bracketed with these calls. The pFpContext parameter
-- should be an object of type FP_CONTEXT that is
-- declared local to the handler.
procedure fppRestore (pFpContext : in out FP_CONTEXT);
-- Restore floating point context
procedure fppSave (pFpContext : in out FP_CONTEXT);
-- Save floating point context
private
type FP_CONTEXT is new System.VxWorks.FP_CONTEXT;
-- Target-dependent floating point context type
pragma Import (C, intConnect, "intConnect");
pragma Import (C, intContext, "intContext");
pragma Import (C, intVecGet, "intVecGet");
pragma Import (C, intVecSet, "intVecSet");
pragma Import (C, INUM_TO_IVEC, "__gnat_inum_to_ivec");
pragma Import (C, sysIntEnable, "sysIntEnable");
pragma Import (C, sysIntDisable, "sysIntDisable");
pragma Import (C, sysBusIntAck, "sysBusIntAck");
pragma Import (C, sysBusIntGen, "sysBusIntGen");
pragma Import (C, logMsg, "logMsg");
pragma Import (C, fppRestore, "fppRestore");
pragma Import (C, fppSave, "fppSave");
end Interfaces.VxWorks;
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