127 lines
4 KiB
C
127 lines
4 KiB
C
/****************************************************************************
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* arch/arm/src/armv7-a/arm_releasepending.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 <sched.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/sched.h>
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#include "sched/sched.h"
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#include "group/group.h"
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#include "arm_internal.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_release_pending
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*
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* Description:
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* Release and ready-to-run tasks that have collected in the pending task
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* list. This can call a context switch if a new task is placed at the
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* head of the ready to run list.
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*
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****************************************************************************/
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void up_release_pending(void)
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{
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struct tcb_s *rtcb = this_task();
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sinfo("From TCB=%p\n", rtcb);
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/* Merge the g_pendingtasks list into the ready-to-run task list */
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if (nxsched_merge_pending())
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{
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/* The currently active task has changed! We will need to
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* switch contexts.
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*/
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/* Update scheduler parameters */
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nxsched_suspend_scheduler(rtcb);
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/* Are we operating in interrupt context? */
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if (CURRENT_REGS)
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{
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/* Yes, then we have to do things differently.
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* Just copy the CURRENT_REGS into the OLD rtcb.
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*/
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arm_savestate(rtcb->xcp.regs);
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/* Restore the exception context of the rtcb at the (new) head
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* of the ready-to-run task list.
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*/
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rtcb = this_task();
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/* Update scheduler parameters */
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nxsched_resume_scheduler(rtcb);
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/* Then switch contexts. Any necessary address environment
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* changes will be made when the interrupt returns.
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*/
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arm_restorestate(rtcb->xcp.regs);
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}
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/* Copy the exception context into the TCB of the task that
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* was currently active. if arm_saveusercontext returns a non-zero
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* value, then this is really the previously running task
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* restarting!
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*/
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else if (!arm_saveusercontext(rtcb->xcp.regs))
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{
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/* Restore the exception context of the rtcb at the (new) head
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* of the ready-to-run task list.
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*/
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rtcb = this_task();
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#ifdef CONFIG_ARCH_ADDRENV
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/* Make sure that the address environment for the previously
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* running task is closed down gracefully (data caches dump,
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* MMU flushed) and set up the address environment for the new
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* thread at the head of the ready-to-run list.
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*/
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group_addrenv(rtcb);
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#endif
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/* Update scheduler parameters */
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nxsched_resume_scheduler(rtcb);
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/* Then switch contexts */
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arm_fullcontextrestore(rtcb->xcp.regs);
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}
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}
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}
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