361 lines
8.3 KiB
C
361 lines
8.3 KiB
C
/* FIFO kernel services */
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/*
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* Copyright (c) 1997-2010, 2013-2014 Wind River Systems, Inc.
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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,
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* this 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 notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* 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 <minik.h>
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#include <string.h>
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#include <toolchain.h>
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#include <sections.h>
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/*******************************************************************************
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*
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* _k_fifo_enque_reply - finish performing an incomplete FIFO enqueue request
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*
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* RETURNS: N/A
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*/
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void _k_fifo_enque_reply(struct k_args *A)
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{
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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if (A->Time.timer)
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FREETIMER(A->Time.timer);
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if (unlikely(A->Comm == ENQ_TMO)) {
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REMOVE_ELM(A);
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A->Time.rcode = RC_TIME;
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} else {
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A->Time.rcode = RC_OK;
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}
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#else
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A->Time.rcode = RC_OK;
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#endif
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reset_state_bit(A->Ctxt.proc, TF_ENQU);
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}
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/*******************************************************************************
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*
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* _k_fifo_enque_request - perform a FIFO enqueue request
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*
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* RETURNS: N/A
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*/
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void _k_fifo_enque_request(struct k_args *A)
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{
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struct k_args *W;
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struct que_struct *Q;
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int Qid, n, w;
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char *p, *q; /* Ski char->uint32_t ??? */
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Qid = A->Args.q1.queue;
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Q = _k_fifo_list + OBJ_INDEX(Qid);
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w = OCTET_TO_SIZEOFUNIT(Q->Esize);
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q = A->Args.q1.data;
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n = Q->Nused;
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if (n < Q->Nelms) {
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W = Q->Waiters;
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if (W) {
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Q->Waiters = W->Forw;
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p = W->Args.q1.data;
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k_memcpy(p, q, w);
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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if (W->Time.timer) {
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force_timeout(W);
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W->Comm = DEQ_RPL;
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} else {
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#endif
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W->Time.rcode = RC_OK;
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reset_state_bit(W->Ctxt.proc, TF_DEQU);
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}
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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}
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#endif
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else {
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p = Q->Enqp;
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k_memcpy(p, q, w);
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p = (char *)((int)p + w);
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if (p == Q->Endp)
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Q->Enqp = Q->Base;
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else
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Q->Enqp = p;
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Q->Nused = ++n;
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#ifdef CONFIG_OBJECT_MONITOR
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if (Q->Hmark < n)
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Q->Hmark = n;
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#endif
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}
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A->Time.rcode = RC_OK;
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#ifdef CONFIG_OBJECT_MONITOR
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Q->Count++;
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#endif
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} else {
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if (likely(A->Time.ticks != TICKS_NONE)) {
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A->Ctxt.proc = _k_current_task;
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A->Prio = _k_current_task->Prio;
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set_state_bit(_k_current_task, TF_ENQU);
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INSERT_ELM(Q->Waiters, A);
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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if (A->Time.ticks == TICKS_UNLIMITED)
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A->Time.timer = NULL;
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else {
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A->Comm = ENQ_TMO;
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enlist_timeout(A);
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}
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#endif
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} else {
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A->Time.rcode = RC_FAIL;
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}
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}
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}
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/*******************************************************************************
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*
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* _task_fifo_put - FIFO enqueue request
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*
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* This routine puts an entry at the end of the FIFO queue.
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*
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* RETURNS: RC_OK, RC_FAIL, RC_TIME on success, failure, timeout respectively
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*/
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int _task_fifo_put(kfifo_t queue, /* FIFO queue */
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void *data, /* ptr to data to add to queue */
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int32_t time /* maximum number of ticks to wait */
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)
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{
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struct k_args A;
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A.Comm = ENQ_REQ;
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A.Time.ticks = time;
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A.Args.q1.data = (char *)data;
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A.Args.q1.queue = queue;
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KERNEL_ENTRY(&A);
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return A.Time.rcode;
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}
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/*******************************************************************************
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*
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* _k_fifo_deque_reply - finish performing an incomplete FIFO dequeue request
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*
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* RETURNS: N/A
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*/
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void _k_fifo_deque_reply(struct k_args *A)
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{
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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if (A->Time.timer)
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FREETIMER(A->Time.timer);
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if (unlikely(A->Comm == DEQ_TMO)) {
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REMOVE_ELM(A);
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A->Time.rcode = RC_TIME;
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} else {
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A->Time.rcode = RC_OK;
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}
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#else
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A->Time.rcode = RC_OK;
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#endif
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reset_state_bit(A->Ctxt.proc, TF_DEQU);
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}
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/*******************************************************************************
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*
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* _k_fifo_deque_request - perform FIFO dequeue request
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*
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* RETURNS: N/A
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*/
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void _k_fifo_deque_request(struct k_args *A)
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{
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struct k_args *W;
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struct que_struct *Q;
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int Qid, n, w;
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char *p, *q; /* idem */
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Qid = A->Args.q1.queue;
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Q = _k_fifo_list + OBJ_INDEX(Qid);
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w = OCTET_TO_SIZEOFUNIT(Q->Esize);
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p = A->Args.q1.data;
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n = Q->Nused;
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if (n) {
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q = Q->Deqp;
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k_memcpy(p, q, w);
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q = (char *)((int)q + w);
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if (q == Q->Endp)
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Q->Deqp = Q->Base;
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else
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Q->Deqp = q;
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A->Time.rcode = RC_OK;
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W = Q->Waiters;
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if (W) {
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Q->Waiters = W->Forw;
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p = Q->Enqp;
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q = W->Args.q1.data;
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w = OCTET_TO_SIZEOFUNIT(Q->Esize);
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k_memcpy(p, q, w);
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p = (char *)((int)p + w);
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if (p == Q->Endp)
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Q->Enqp = Q->Base;
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else
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Q->Enqp = p;
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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if (W->Time.timer) {
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force_timeout(W);
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W->Comm = ENQ_RPL;
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} else {
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#endif
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W->Time.rcode = RC_OK;
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reset_state_bit(W->Ctxt.proc, TF_ENQU);
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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}
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#endif
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#ifdef CONFIG_OBJECT_MONITOR
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Q->Count++;
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#endif
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} else
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Q->Nused = --n;
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} else {
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if (likely(A->Time.ticks != TICKS_NONE)) {
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A->Ctxt.proc = _k_current_task;
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A->Prio = _k_current_task->Prio;
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set_state_bit(_k_current_task, TF_DEQU);
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INSERT_ELM(Q->Waiters, A);
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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if (A->Time.ticks == TICKS_UNLIMITED)
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A->Time.timer = NULL;
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else {
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A->Comm = DEQ_TMO;
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enlist_timeout(A);
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}
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#endif
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} else {
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A->Time.rcode = RC_FAIL;
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}
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}
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}
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/*******************************************************************************
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*
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* _task_fifo_get - FIFO dequeue request
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*
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* This routine tries to read a data element from the FIFO.
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*
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* If the FIFO is not empty, the oldest entry is removed and copied to the
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* address provided by the caller.
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*
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* RETURNS: RC_OK, RC_FAIL, RC_TIME on success, failure, timeout respectively
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*/
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int _task_fifo_get(kfifo_t queue, /* FIFO queue */
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void *data, /* where to store FIFO entry */
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int32_t time /* maximum number of ticks to wait */
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)
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{
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struct k_args A;
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A.Comm = DEQ_REQ;
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A.Time.ticks = time;
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A.Args.q1.data = (char *)data;
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A.Args.q1.queue = queue;
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KERNEL_ENTRY(&A);
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return A.Time.rcode;
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}
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/*******************************************************************************
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*
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* _k_fifo_ioctl - perform miscellaneous FIFO request
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*
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* RETURNS: N/A
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*/
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void _k_fifo_ioctl(struct k_args *A)
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{
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struct que_struct *Q;
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int Qid;
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Qid = A->Args.q1.queue;
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Q = _k_fifo_list + OBJ_INDEX(Qid);
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if (A->Args.q1.size) {
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if (Q->Nused) {
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struct k_args *X;
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while ((X = Q->Waiters)) {
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Q->Waiters = X->Forw;
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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if (likely(X->Time.timer)) {
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force_timeout(X);
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X->Comm = ENQ_RPL;
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} else {
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#endif
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X->Time.rcode = RC_FAIL;
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reset_state_bit(X->Ctxt.proc, TF_ENQU);
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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}
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#endif
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}
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}
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Q->Nused = 0;
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Q->Enqp = Q->Deqp = Q->Base;
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A->Time.rcode = RC_OK;
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} else
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A->Time.rcode = Q->Nused;
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}
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/*******************************************************************************
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*
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* _task_fifo_ioctl - miscellaneous FIFO request
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*
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* Depending upon the chosen operation, this routine will ...
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* 1. <op> = 0 : query the number of FIFO entries
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* 2. <op> = 1 : purge the FIFO of its entries
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*
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* RETURNS: # of FIFO entries on query; RC_OK on purge
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*/
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int _task_fifo_ioctl(kfifo_t queue, /* FIFO queue */
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int op /* 0: status query; 1: purge */
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)
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{
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struct k_args A;
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A.Comm = QUEUE;
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A.Args.q1.queue = queue;
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A.Args.q1.size = op;
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KERNEL_ENTRY(&A);
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return A.Time.rcode;
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}
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