File content as of revision 125:5713cbbdb706:

/*----------------------------------------------------------------------------
 *      CMSIS-RTOS  -  RTX
 *----------------------------------------------------------------------------
 *      Name:    rt_OsEventObserver.c
 *      Purpose: OS Event Callbacks for CMSIS RTOS
 *      Rev.:    VX.XX
 *----------------------------------------------------------------------------
 *
 * Copyright (c) 1999-2009 KEIL, 2009-2015 ARM Germany GmbH
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *  - Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  - Neither the name of ARM  nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *---------------------------------------------------------------------------*/

#include "rt_OsEventObserver.h"

/*
 *  _____ _____  ____  __ _____
 * |  ___|_ _\ \/ /  \/  | ____|
 * | |_   | | \  /| |\/| |  _|
 * |  _|  | | /  \| |  | | |___
 * |_|   |___/_/\_\_|  |_|_____|
 *
 * FIXME:
 * The osEventObs variable must be in protected memory. If not every box
 * and box 0 can modify osEventObs to point to any handler to run code
 * privileged. This issue is tracked at
 * <https://github.com/ARMmbed/uvisor/issues/235>.
 */
const OsEventObserver *osEventObs;

void osRegisterForOsEvents(const OsEventObserver *observer)
{
    static uint8_t has_been_called = 0;
    if (has_been_called) {
        return;
    }
    has_been_called = 1;

    osEventObs = observer;
}