159 lines
5.0 KiB
C
159 lines
5.0 KiB
C
/****************************************************************************
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* mm/iob/iob_initialize.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <nuttx/mm/iob.h>
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#include "iob.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define ROUNDUP(x, y) (((x) + (y) - 1) / (y) * (y))
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/* Fix the I/O Buffer size with specified alignment size */
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#define IOB_ALIGN_SIZE ROUNDUP(sizeof(struct iob_s), CONFIG_IOB_ALIGNMENT)
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#define IOB_BUFFER_SIZE (IOB_ALIGN_SIZE * CONFIG_IOB_NBUFFERS + \
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CONFIG_IOB_ALIGNMENT - 1)
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* Following raw buffer will be divided into iob_s instances, the initial
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* procedure will ensure that the member io_head of each iob_s is aligned
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* to the CONFIG_IOB_ALIGNMENT memory boundary.
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*/
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#ifdef IOB_SECTION
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static uint8_t g_iob_buffer[IOB_BUFFER_SIZE] locate_data(IOB_SECTION);
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#else
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static uint8_t g_iob_buffer[IOB_BUFFER_SIZE];
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#endif
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#if CONFIG_IOB_NCHAINS > 0
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/* This is a pool of pre-allocated iob_qentry_s buffers */
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static struct iob_qentry_s g_iob_qpool[CONFIG_IOB_NCHAINS];
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#endif
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* A list of all free, unallocated I/O buffers */
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FAR struct iob_s *g_iob_freelist;
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/* A list of I/O buffers that are committed for allocation */
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FAR struct iob_s *g_iob_committed;
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#if CONFIG_IOB_NCHAINS > 0
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/* A list of all free, unallocated I/O buffer queue containers */
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FAR struct iob_qentry_s *g_iob_freeqlist;
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/* A list of I/O buffer queue containers that are committed for allocation */
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FAR struct iob_qentry_s *g_iob_qcommitted;
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#endif
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/* Counting semaphores that tracks the number of free IOBs/qentries */
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sem_t g_iob_sem = SEM_INITIALIZER(CONFIG_IOB_NBUFFERS);
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#if CONFIG_IOB_THROTTLE > 0
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/* Counts available I/O buffers when throttled */
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sem_t g_throttle_sem = SEM_INITIALIZER(CONFIG_IOB_NBUFFERS -
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CONFIG_IOB_THROTTLE);
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#endif
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#if CONFIG_IOB_NCHAINS > 0
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/* Counts free I/O buffer queue containers */
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sem_t g_qentry_sem = SEM_INITIALIZER(CONFIG_IOB_NCHAINS);
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: iob_initialize
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*
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* Description:
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* Set up the I/O buffers for normal operations.
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*
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****************************************************************************/
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void iob_initialize(void)
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{
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int i;
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uintptr_t buf;
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/* Get a start address which plus offsetof(struct iob_s, io_head) is
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* aligned to the CONFIG_IOB_ALIGNMENT memory boundary
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*/
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buf = ROUNDUP((uintptr_t)g_iob_buffer + offsetof(struct iob_s, io_head),
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CONFIG_IOB_ALIGNMENT) - offsetof(struct iob_s, io_head);
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/* Get I/O buffer instance from the start address and add each I/O buffer
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* to the free list
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*/
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for (i = 0; i < CONFIG_IOB_NBUFFERS; i++)
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{
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FAR struct iob_s *iob = (FAR struct iob_s *)(buf + i * IOB_ALIGN_SIZE);
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/* Add the pre-allocate I/O buffer to the head of the free list */
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iob->io_flink = g_iob_freelist;
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g_iob_freelist = iob;
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}
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#if CONFIG_IOB_NCHAINS > 0
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/* Add each I/O buffer chain queue container to the free list */
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for (i = 0; i < CONFIG_IOB_NCHAINS; i++)
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{
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FAR struct iob_qentry_s *iobq = &g_iob_qpool[i];
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/* Add the pre-allocate buffer container to the head of the free
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* list
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*/
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iobq->qe_flink = g_iob_freeqlist;
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g_iob_freeqlist = iobq;
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}
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#endif
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}
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