cc96289e2d
reason: simplify context switch sys_call0(SYS_switch_context) sys_call0(SYS_restore_context) size nuttx before text data bss dec hex filename 187620 1436 169296 358352 577d0 nuttx after text data bss dec hex filename 187576 1452 169280 358308 577a4 nuttx size reduce -44 Signed-off-by: hujun5 <hujun5@xiaomi.com>
78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
/****************************************************************************
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* arch/xtensa/src/common/xtensa_switchcontext.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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 <assert.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 <arch/chip/core-isa.h>
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#include "sched/sched.h"
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#include "group/group.h"
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#include "clock/clock.h"
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#include "xtensa.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_switch_context
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*
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* Description:
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* A task is currently in the ready-to-run list but has been prepped
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* to execute. Restore its context, and start execution.
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*
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* Input Parameters:
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* tcb: Refers to the head task of the ready-to-run list
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* which will be executed.
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* rtcb: Refers to the running task which will be blocked.
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*
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****************************************************************************/
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void up_switch_context(struct tcb_s *tcb, struct tcb_s *rtcb)
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{
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/* Are we in an interrupt handler? */
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if (!up_interrupt_context())
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{
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/* Switch context to the context of the task at the head of the
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* ready to run list.
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*/
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xtensa_switchcontext();
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/* xtensa_switchcontext forces a context switch to the task at the
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* head of the ready-to-run list. It does not 'return' in the
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* normal sense. When it does return, it is because the blocked
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* task is again ready to run and has execution priority.
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*/
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}
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}
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