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

*                                                                             *

* License Agreement                                                           *

*                                                                             *

* Copyright (c) 2013 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 "io.h"

#include "sys/alt_exceptions.h"

/*

 * This file implements support for calling a user-registered handler

 * when a likely fatal ECC error exception occurs.

 */

/*

 * Global variable containing address to jump to when likely fatal

 * ECC error exception occurs.

 */

alt_u32 alt_exception_ecc_fatal_handler = 0x0;

/*

 * Pull in the exception entry assembly code. This will not be linked in

 * unless this object is linked into the executable (i.e. only if

 * alt_ecc_fatal_exception_register() is called).

 */

__asm__( "\n\t.globl alt_exception" );

/*

 * alt_ecc_fatal_exception_register() is called to register a handler to

 * service likely fatal ECC error exceptions.

 *

 * Passing null (0x0) in the handler argument will disable a previously-

 * registered handler.

 *

 * Note that if no handler is registered, just normal exception processing

 * occurs on a likely fatal ECC exception and the exception processing

 * code might trigger an infinite exception loop.

 */

void

alt_ecc_fatal_exception_register(alt_u32 handler)

{

    /*

     * Use IOWR to make sure this bypasses the data cache.

     * This is required because the exception handler uses ldwio

     * to read this value.

     */

    IOWR(&alt_exception_ecc_fatal_handler, 0, handler);

}