mirror of
https://gitlab.rtems.org/rtems/rtos/rtems.git
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bc959e983f
Add "(void) param;" annotation to address unused parameter warnings. Found with GCC's warning -Wunused-parameter.
65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup RTEMSBSPGCCAtomics
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*
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* @brief Implementation of GCC Atomic Helper
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*
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* This implementation is used on BSPs with older cores which do not
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* have atomic instructions. If the CPU core has atomic instructions,
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* GCC will do the right thing.
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*
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* https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
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* describes the interface for __atomic_test_and_set with the *mem
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* being precisely one byte.
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*/
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/*
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* COPYRIGHT (c) 2025. On-Line Applications Research Corporation (OAR).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdbool.h>
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#include <rtems.h>
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bool __atomic_test_and_set( volatile void *mem, int access )
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{
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(void) access;
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volatile uint8_t *lock = (volatile uint8_t *) mem;
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rtems_interrupt_level level;
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uint8_t value;
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rtems_interrupt_disable( level );
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value = *lock;
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*lock = 1;
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rtems_interrupt_enable( level );
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return value;
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}
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