105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
/*
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* Copyright (c) 2018, Arm Limited. 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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#include <assert.h>
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#include <errno.h>
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#include <stdint.h>
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#include <string.h>
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#include "sprt_queue.h"
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void sprt_queue_init(void *queue_base, uint32_t entry_num, uint32_t entry_size)
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{
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assert(queue_base != NULL);
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assert(entry_size > 0U);
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assert(entry_num > 0U);
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struct sprt_queue *queue = (struct sprt_queue *)queue_base;
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queue->entry_num = entry_num;
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queue->entry_size = entry_size;
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queue->idx_write = 0U;
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queue->idx_read = 0U;
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memset(queue->data, 0, entry_num * entry_size);
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}
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int sprt_queue_is_empty(void *queue_base)
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{
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assert(queue_base != NULL);
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struct sprt_queue *queue = (struct sprt_queue *)queue_base;
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return (queue->idx_write == queue->idx_read);
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}
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int sprt_queue_is_full(void *queue_base)
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{
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assert(queue_base != NULL);
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struct sprt_queue *queue = (struct sprt_queue *)queue_base;
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uint32_t idx_next_write = (queue->idx_write + 1) % queue->entry_num;
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return (idx_next_write == queue->idx_read);
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}
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int sprt_queue_push(void *queue_base, const void *entry)
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{
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assert(entry != NULL);
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assert(queue_base != NULL);
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if (sprt_queue_is_full(queue_base) != 0) {
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return -ENOMEM;
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}
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struct sprt_queue *queue = (struct sprt_queue *)queue_base;
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uint8_t *dst_entry = &queue->data[queue->entry_size * queue->idx_write];
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memcpy(dst_entry, entry, queue->entry_size);
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/*
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* Make sure that the message data is visible before increasing the
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* counter of available messages.
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*/
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__asm__ volatile("dmb st" ::: "memory");
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queue->idx_write = (queue->idx_write + 1) % queue->entry_num;
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__asm__ volatile("dmb st" ::: "memory");
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return 0;
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}
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int sprt_queue_pop(void *queue_base, void *entry)
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{
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assert(entry != NULL);
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assert(queue_base != NULL);
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if (sprt_queue_is_empty(queue_base) != 0) {
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return -ENOENT;
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}
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struct sprt_queue *queue = (struct sprt_queue *)queue_base;
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uint8_t *src_entry = &queue->data[queue->entry_size * queue->idx_read];
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memcpy(entry, src_entry, queue->entry_size);
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/*
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* Make sure that the message data is visible before increasing the
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* counter of read messages.
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*/
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__asm__ volatile("dmb st" ::: "memory");
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queue->idx_read = (queue->idx_read + 1) % queue->entry_num;
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__asm__ volatile("dmb st" ::: "memory");
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return 0;
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}
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