140 lines
4.8 KiB
C
140 lines
4.8 KiB
C
/*
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* Copyright (c) 2020 - 2021, 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 Nordic Semiconductor ASA 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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*/
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/**
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* @file nrf_802154_buffer_allocator.c
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* @brief Buffer allocation for 802.15.4 receptions and transmissions.
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*/
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#include "nrf_802154_buffer_allocator.h"
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#include "nrf_802154_serialization_crit_sect.h"
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#include <assert.h>
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#include <inttypes.h>
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#include <stdbool.h>
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#include <stdint.h>
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static uint8_t * buffer_alloc(nrf_802154_buffer_t * p_buffer_pool, size_t buffer_pool_len)
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{
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nrf_802154_buffer_t * p_buffer = NULL;
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bool success = false;
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bool retry = false;
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uint32_t crit_sect = 0UL;
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do
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{
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retry = false;
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// Iterate over the buffer pool to search for a free buffer
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for (uint32_t i = 0; i < buffer_pool_len; i++)
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{
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p_buffer = &p_buffer_pool[i];
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if (!p_buffer->taken)
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{
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// Free buffer detected. Enter critical section to take it
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nrf_802154_serialization_crit_sect_enter(&crit_sect);
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if (p_buffer->taken)
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{
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// The allocation was preempted and the buffer was taken by higher priority
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// Reiterate over the buffer pool and search for a free buffer again
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retry = true;
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}
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else
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{
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// The allocation can be performed safely
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p_buffer->taken = true;
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success = true;
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}
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nrf_802154_serialization_crit_sect_exit(crit_sect);
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break;
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}
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}
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}
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while (retry);
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return success ? p_buffer->data : NULL;
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}
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static void buffer_free(nrf_802154_buffer_t * p_buffer_to_free,
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nrf_802154_buffer_t * p_buffer_pool,
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size_t buffer_pool_len)
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{
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uint32_t crit_sect = 0UL;
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size_t idx =
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((uintptr_t)p_buffer_to_free - (uintptr_t)p_buffer_pool) / sizeof(nrf_802154_buffer_t);
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assert(idx < buffer_pool_len);
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nrf_802154_serialization_crit_sect_enter(&crit_sect);
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p_buffer_pool[idx].taken = false;
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nrf_802154_serialization_crit_sect_exit(crit_sect);
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}
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void nrf_802154_buffer_allocator_init(nrf_802154_buffer_allocator_t * p_obj,
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void * p_memory,
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size_t memsize)
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{
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size_t capacity = memsize / sizeof(nrf_802154_buffer_t);
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assert((capacity == 0U) || ((capacity != 0U) && (p_memory != NULL)));
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p_obj->p_memory = p_memory;
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p_obj->capacity = capacity;
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nrf_802154_buffer_t * p_buffer = (nrf_802154_buffer_t *)p_obj->p_memory;
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for (size_t i = 0; i < p_obj->capacity; i++)
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{
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p_buffer[i].taken = false;
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}
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}
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void * nrf_802154_buffer_allocator_alloc(const nrf_802154_buffer_allocator_t * p_obj)
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{
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return buffer_alloc((nrf_802154_buffer_t *)p_obj->p_memory, p_obj->capacity);
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}
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void nrf_802154_buffer_allocator_free(const nrf_802154_buffer_allocator_t * p_obj,
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void * p_buffer)
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{
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buffer_free(p_buffer, (nrf_802154_buffer_t *)p_obj->p_memory, p_obj->capacity);
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}
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