c702374d7b
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5750 42af7a65-404d-4744-a932-0658087f49c3
98 lines
4.1 KiB
C
98 lines
4.1 KiB
C
/****************************************************************************
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* arch/arm/src/common/up_task_start.c
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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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 <nuttx/arch.h>
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#include "svcall.h"
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#include "up_internal.h"
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#ifdef CONFIG_NUTTX_KERNEL
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_task_start
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*
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* Description:
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* In this kernel mode build, this function will be called to execute a
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* task in user-space. When the task is first started, a kernel-mode
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* stub will first run to perform some housekeeping functions. This
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* kernel-mode stub will then be called transfer control to the user-mode
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* task.
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*
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* Normally the a user-mode start-up stub will also execute before the
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* task actually starts. See libc/sched/task_startup.c
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*
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* Input Parameters:
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* taskentry - The user-space entry point of the task.
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* argc - The number of parameters being passed.
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* argv - The parameters being passed. These lie in kernel-space memory
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* and will have to be reallocated in user-space memory.
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*
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* Returned Value:
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* This function should not return. It should call the user-mode start-up
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* stub and that stub should call exit if/when the user task terminates.
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*
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****************************************************************************/
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void up_task_start(main_t taskentry, int argc, FAR char *argv[])
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{
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/* Let sys_call3() do all of the work */
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sys_call3(SYS_task_start, (uintptr_t)taskentry, (uintptr_t)argc,
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(uintptr_t)argv);
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}
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#endif /* CONFIG_NUTTX_KERNEL */
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