97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
/*
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* Copyright (c) 2021 - 2023, Nordic Semiconductor ASA
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* All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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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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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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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 HOLDER 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 <helpers/nrfx_flag32_allocator.h>
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#if !defined(NRFX_ATOMIC_CAS)
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static bool nrfx_flag32_atomic_cas(nrfx_atomic_t * p_data, uint32_t old_value, uint32_t new_value)
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{
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bool status = false;
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NRFX_CRITICAL_SECTION_ENTER();
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if (*p_data == old_value)
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{
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*p_data = new_value;
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status = true;
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}
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NRFX_CRITICAL_SECTION_EXIT();
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return status;
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}
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#define NRFX_ATOMIC_CAS(p_data, old_value, new_value) \
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nrfx_flag32_atomic_cas(p_data, old_value, new_value)
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#endif // !defined(NRFX_ATOMIC_CAS)
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bool nrfx_flag32_is_allocated(nrfx_atomic_t mask, uint8_t bitpos)
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{
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return (mask & NRFX_BIT(bitpos)) ? false : true;
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}
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nrfx_err_t nrfx_flag32_alloc(nrfx_atomic_t * p_mask, uint8_t *p_flag)
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{
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uint8_t idx;
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uint32_t new_mask, prev_mask;
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do {
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prev_mask = *p_mask;
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if (prev_mask == 0)
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{
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return NRFX_ERROR_NO_MEM;
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}
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else
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{
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idx = (uint8_t)(31UL - NRF_CLZ(prev_mask));
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}
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new_mask = prev_mask & ~NRFX_BIT(idx);
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} while (!NRFX_ATOMIC_CAS(p_mask, prev_mask, new_mask));
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*p_flag = idx;
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return NRFX_SUCCESS;
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}
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nrfx_err_t nrfx_flag32_free(nrfx_atomic_t * p_mask, uint8_t flag)
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{
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uint32_t new_mask, prev_mask;
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if ((NRFX_BIT(flag) & *p_mask))
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{
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return NRFX_ERROR_INVALID_PARAM;
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}
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do {
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prev_mask = *p_mask;
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new_mask = prev_mask | NRFX_BIT(flag);
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} while (!NRFX_ATOMIC_CAS(p_mask, prev_mask, new_mask));
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return NRFX_SUCCESS;
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}
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