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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [io/] [watchdog/] [v2_0/] [include/] [watchdog.hxx] - Rev 256
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#ifndef CYGONCE_DEVS_WATCHDOG_HXX
#define CYGONCE_DEVS_WATCHDOG_HXX
//==========================================================================
//
// watchdog.hxx
//
// Watchdog interface declaration
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT 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 along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): nickg
// Contributors: nickg
// Date: 1998-07-14
// Purpose: Watchdog declarations
// Description: This file defines the interface to the watchdog device
// that provides timer based recovery from software and
// hardware faults.
// Usage: #include <cyg/devs/watchdog.hxx>
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include <cyg/kernel/ktypes.h>
#include <cyg/infra/cyg_ass.h> // assertion macros
class Cyg_Watchdog_Action;
// -------------------------------------------------------------------------
// Watchdog class
class Cyg_Watchdog
{
Cyg_Watchdog_Action *action_list;
cyg_uint64 resolution;
public:
Cyg_Watchdog();
// Return time interval allowed between resets before watchdog
// triggers, in nanoseconds.
cyg_uint64 get_resolution( void );
// Start the watchdog running.
void start( void );
// Reset watchdog timer. This needs to be called regularly to prevent
// the watchdog firing.
void reset( void );
#ifndef CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT
// Trigger the watchdog as if the timer had expired.
void trigger( void );
// Register an action routine that will be called when the timer
// triggers.
void install_action( Cyg_Watchdog_Action *wdaction );
// Deregister a previously registered action routine.
void uninstall_action( Cyg_Watchdog_Action *wdaction );
#endif
// A static instance of the single system defined watchdog device.
static Cyg_Watchdog watchdog;
private:
void init_hw( void );
};
#ifndef CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT
// -------------------------------------------------------------------------
// Watchdog action class
class Cyg_Watchdog_Action
{
friend class Cyg_Watchdog;
Cyg_Watchdog_Action *next; // link in chain
void (*action)( CYG_ADDRWORD data ); // action function
CYG_ADDRWORD data; // data argument
public:
Cyg_Watchdog_Action(
void (*action)( CYG_ADDRWORD data ),
CYG_ADDRWORD data
);
~Cyg_Watchdog_Action();
void install();
void uninstall();
};
// -------------------------------------------------------------------------
// Cyg_Watchdog_Action inlines
inline Cyg_Watchdog_Action::Cyg_Watchdog_Action(
void (*action_arg)( CYG_ADDRWORD data ),
CYG_ADDRWORD data_arg
)
{
next = NULL;
action = action_arg;
data = data_arg;
}
inline Cyg_Watchdog_Action::~Cyg_Watchdog_Action()
{
Cyg_Watchdog::watchdog.uninstall_action( this );
}
inline void Cyg_Watchdog_Action::install()
{
Cyg_Watchdog::watchdog.install_action( this );
}
inline void Cyg_Watchdog_Action::uninstall()
{
Cyg_Watchdog::watchdog.uninstall_action( this );
}
#endif // CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT
// -------------------------------------------------------------------------
#endif // ifndef CYGONCE_DEVS_WATCHDOG_HXX
// EOF watchdog.hxx
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