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/******************************************************************************

*                                                                             *

* License Agreement                                                           *

*                                                                             *

* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *

* All rights reserved.                                                        *

*                                                                             *

* Permission is hereby granted, free of charge, to any person obtaining a     *

* copy of this software and associated documentation files (the "Software"),  *

* to deal in the Software without restriction, including without limitation   *

* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *

* and/or sell copies of the Software, and to permit persons to whom the       *

* Software is furnished to do so, subject to the following conditions:        *

*                                                                             *

* The above copyright notice and this permission notice shall be included in  *

* all copies or substantial portions of the Software.                         *

*                                                                             *

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *

* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *

* DEALINGS IN THE SOFTWARE.                                                   *

*                                                                             *

* This agreement shall be governed in all respects by the laws of the State   *

* of California and by the laws of the United States of America.              *

*                                                                             *

* Altera does not recommend, suggest or require that this reference design    *

* file be used in conjunction or combination with any other product.          *

******************************************************************************/

#include "altera_avalon_sysid_qsys.h"

#include "altera_avalon_sysid_qsys_regs.h"

#include "alt_types.h"

#include <io.h>

/*

*  This component is special: there's only one of it.

*  Therefore we can dispense with a bunch of complexity

*  normally associated with components, such as specialized

*  structs containing parameter info, and instead use that

*  info by name directly out of system.h.  A downside of this

*  approach is that each time the system is regenerated, and

*  system.h changes, this file must be recompiled.  Fortunately

*  this file is, and is likely to remain, quite small.

*/

#include "system.h"

#ifdef SYSID_BASE

/*

*  return values:

*    0 if the hardware and software appear to be in sync

*    1 if software appears to be older than hardware

*   -1 if hardware appears to be older than software

*/

alt_32 alt_avalon_sysid_qsys_test(void)

{

  /* Read the hardware-tag, aka value0, from the hardware. */

  alt_u32 hardware_id = IORD_ALTERA_AVALON_SYSID_QSYS_ID(SYSID_BASE);

  /* Read the time-of-generation, aka value1, from the hardware register. */

  alt_u32 hardware_timestamp = IORD_ALTERA_AVALON_SYSID_QSYS_TIMESTAMP(SYSID_BASE);

  /* Return 0 if the hardware and software appear to be in sync. */

  if ((SYSID_TIMESTAMP == hardware_timestamp) && (SYSID_ID == hardware_id))

  {

    return 0;

  }

  /*

  *  Return 1 if software appears to be older than hardware (that is,

  *  the value returned by the hardware is larger than that recorded by

  *  the generator function).

  *  If the hardware time happens to match the generator program's value

  *  (but the hardware tag, value0, doesn't match or 0 would have been

  *  returned above), return an arbitrary value, let's say -1.

  */

  return ((alt_32)(hardware_timestamp - SYSID_TIMESTAMP)) > 0 ? 1 : -1;

}

#endif