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/*
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 * Copyright (c) 2005 Jakub Jermar
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 * All rights reserved.
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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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 * - 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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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup main
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 * @{
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 */
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/**
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 * @file
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 * @brief	Userspace bootstrap thread.
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 *
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 * This file contains uinit kernel thread wich is used to start every
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 * userspace thread including threads created by SYS_THREAD_CREATE syscall.
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 *
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 * @see SYS_THREAD_CREATE
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 */
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#include <main/uinit.h>
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#include <arch/types.h>
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#include <proc/thread.h>
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#include <userspace.h>
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#include <mm/slab.h>
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#include <arch.h>
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#include <udebug/udebug.h>
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/** Thread used to bring up userspace thread.
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 *
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 * @param arg Pointer to structure containing userspace entry and stack
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 *     addresses.
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 */
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void uinit(void *arg)
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{
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	uspace_arg_t uarg;
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	/*
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	 * So far, we don't have a use for joining userspace threads so we
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	 * immediately detach each uinit thread. If joining of userspace threads
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	 * is required, some userspace API based on the kernel mechanism will
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	 * have to be implemented. Moreover, garbage collecting of threads that
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	 * didn't detach themselves and nobody else joined them will have to be
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	 * deployed for the event of forceful task termination.
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	 */
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	thread_detach(THREAD);
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#ifdef CONFIG_UDEBUG
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	udebug_stoppable_end();
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#endif
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	uarg.uspace_entry = ((uspace_arg_t *) arg)->uspace_entry;
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	uarg.uspace_stack = ((uspace_arg_t *) arg)->uspace_stack;
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	uarg.uspace_uarg = ((uspace_arg_t *) arg)->uspace_uarg;
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	uarg.uspace_thread_function = NULL;
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	uarg.uspace_thread_arg = NULL;
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	free((uspace_arg_t *) arg);
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	/*
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	 * Disable interrupts so that the execution of userspace() is not
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	 * disturbed by any interrupts as some of the userspace()
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	 * implementations will switch to the userspace stack before switching
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	 * the mode.
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	 */
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	(void) interrupts_disable();
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	userspace(&uarg);
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}
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/** @}
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 */