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Dependencies:   mbed

mbed-rtos/rtx/TARGET_CORTEX_M/rt_OsEventObserver.c@0:b435eadf76b4, 2022-03-28 (annotated)

Committer:
flo__
Date:
Mon Mar 28 15:54:19 2022 +0000
Revision:
0:b435eadf76b4
28/03/2022

Who changed what in which revision?

UserRevisionLine numberNew contents of line
flo__ 0:b435eadf76b4 1 /*----------------------------------------------------------------------------
flo__ 0:b435eadf76b4 2 * CMSIS-RTOS - RTX
flo__ 0:b435eadf76b4 3 *----------------------------------------------------------------------------
flo__ 0:b435eadf76b4 4 * Name: rt_OsEventObserver.c
flo__ 0:b435eadf76b4 5 * Purpose: OS Event Callbacks for CMSIS RTOS
flo__ 0:b435eadf76b4 6 * Rev.: VX.XX
flo__ 0:b435eadf76b4 7 *----------------------------------------------------------------------------
flo__ 0:b435eadf76b4 8 *
flo__ 0:b435eadf76b4 9 * Copyright (c) 1999-2009 KEIL, 2009-2015 ARM Germany GmbH
flo__ 0:b435eadf76b4 10 * All rights reserved.
flo__ 0:b435eadf76b4 11 * Redistribution and use in source and binary forms, with or without
flo__ 0:b435eadf76b4 12 * modification, are permitted provided that the following conditions are met:
flo__ 0:b435eadf76b4 13 * - Redistributions of source code must retain the above copyright
flo__ 0:b435eadf76b4 14 * notice, this list of conditions and the following disclaimer.
flo__ 0:b435eadf76b4 15 * - Redistributions in binary form must reproduce the above copyright
flo__ 0:b435eadf76b4 16 * notice, this list of conditions and the following disclaimer in the
flo__ 0:b435eadf76b4 17 * documentation and/or other materials provided with the distribution.
flo__ 0:b435eadf76b4 18 * - Neither the name of ARM nor the names of its contributors may be used
flo__ 0:b435eadf76b4 19 * to endorse or promote products derived from this software without
flo__ 0:b435eadf76b4 20 * specific prior written permission.
flo__ 0:b435eadf76b4 21 *
flo__ 0:b435eadf76b4 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
flo__ 0:b435eadf76b4 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
flo__ 0:b435eadf76b4 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
flo__ 0:b435eadf76b4 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
flo__ 0:b435eadf76b4 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
flo__ 0:b435eadf76b4 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
flo__ 0:b435eadf76b4 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
flo__ 0:b435eadf76b4 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
flo__ 0:b435eadf76b4 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
flo__ 0:b435eadf76b4 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
flo__ 0:b435eadf76b4 32 * POSSIBILITY OF SUCH DAMAGE.
flo__ 0:b435eadf76b4 33 *---------------------------------------------------------------------------*/
flo__ 0:b435eadf76b4 34
flo__ 0:b435eadf76b4 35 #include "rt_OsEventObserver.h"
flo__ 0:b435eadf76b4 36
flo__ 0:b435eadf76b4 37 /*
flo__ 0:b435eadf76b4 38 * _____ _____ ____ __ _____
flo__ 0:b435eadf76b4 39 * | ___|_ _\ \/ / \/ | ____|
flo__ 0:b435eadf76b4 40 * | |_ | | \ /| |\/| | _|
flo__ 0:b435eadf76b4 41 * | _| | | / \| | | | |___
flo__ 0:b435eadf76b4 42 * |_| |___/_/\_\_| |_|_____|
flo__ 0:b435eadf76b4 43 *
flo__ 0:b435eadf76b4 44 * FIXME:
flo__ 0:b435eadf76b4 45 * The osEventObs variable must be in protected memory. If not every box
flo__ 0:b435eadf76b4 46 * and box 0 can modify osEventObs to point to any handler to run code
flo__ 0:b435eadf76b4 47 * privileged. This issue is tracked at
flo__ 0:b435eadf76b4 48 * <https://github.com/ARMmbed/uvisor/issues/235>.
flo__ 0:b435eadf76b4 49 */
flo__ 0:b435eadf76b4 50 const OsEventObserver *osEventObs;
flo__ 0:b435eadf76b4 51
flo__ 0:b435eadf76b4 52 void osRegisterForOsEvents(const OsEventObserver *observer)
flo__ 0:b435eadf76b4 53 {
flo__ 0:b435eadf76b4 54 static uint8_t has_been_called = 0;
flo__ 0:b435eadf76b4 55 if (has_been_called) {
flo__ 0:b435eadf76b4 56 return;
flo__ 0:b435eadf76b4 57 }
flo__ 0:b435eadf76b4 58 has_been_called = 1;
flo__ 0:b435eadf76b4 59
flo__ 0:b435eadf76b4 60 osEventObs = observer;
flo__ 0:b435eadf76b4 61 }