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/*
* Copyright (c) 2018, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include "sprt_queue.h"
void sprt_queue_init(void *queue_base, uint32_t entry_num, uint32_t entry_size)
{
assert(queue_base != NULL);
assert(entry_size > 0U);
assert(entry_num > 0U);
struct sprt_queue *queue = (struct sprt_queue *)queue_base;
queue->entry_num = entry_num;
queue->entry_size = entry_size;
queue->idx_write = 0U;
queue->idx_read = 0U;
memset(queue->data, 0, entry_num * entry_size);
}
int sprt_queue_is_empty(void *queue_base)
{
assert(queue_base != NULL);
struct sprt_queue *queue = (struct sprt_queue *)queue_base;
return (queue->idx_write == queue->idx_read);
}
int sprt_queue_is_full(void *queue_base)
{
assert(queue_base != NULL);
struct sprt_queue *queue = (struct sprt_queue *)queue_base;
uint32_t idx_next_write = (queue->idx_write + 1) % queue->entry_num;
return (idx_next_write == queue->idx_read);
}
int sprt_queue_push(void *queue_base, const void *entry)
{
assert(entry != NULL);
assert(queue_base != NULL);
if (sprt_queue_is_full(queue_base) != 0) {
return -ENOMEM;
}
struct sprt_queue *queue = (struct sprt_queue *)queue_base;
uint8_t *dst_entry = &queue->data[queue->entry_size * queue->idx_write];
memcpy(dst_entry, entry, queue->entry_size);
/*
* Make sure that the message data is visible before increasing the
* counter of available messages.
*/
__asm__ volatile("dmb st" ::: "memory");
queue->idx_write = (queue->idx_write + 1) % queue->entry_num;
__asm__ volatile("dmb st" ::: "memory");
return 0;
}
int sprt_queue_pop(void *queue_base, void *entry)
{
assert(entry != NULL);
assert(queue_base != NULL);
if (sprt_queue_is_empty(queue_base) != 0) {
return -ENOENT;
}
struct sprt_queue *queue = (struct sprt_queue *)queue_base;
uint8_t *src_entry = &queue->data[queue->entry_size * queue->idx_read];
memcpy(entry, src_entry, queue->entry_size);
/*
* Make sure that the message data is visible before increasing the
* counter of read messages.
*/
__asm__ volatile("dmb st" ::: "memory");
queue->idx_read = (queue->idx_read + 1) % queue->entry_num;
__asm__ volatile("dmb st" ::: "memory");
return 0;
}
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