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