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  1. /*
  2.  * Copyright (c) 2005 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup main
  30.  * @{
  31.  */
  32.  
  33. /**
  34.  * @file
  35.  * @brief   Userspace bootstrap thread.
  36.  *
  37.  * This file contains uinit kernel thread wich is used to start every
  38.  * userspace thread including threads created by SYS_THREAD_CREATE syscall.
  39.  *
  40.  * @see SYS_THREAD_CREATE
  41.  */
  42.  
  43. #include <main/uinit.h>
  44. #include <arch/types.h>
  45. #include <proc/thread.h>
  46. #include <userspace.h>
  47. #include <mm/slab.h>
  48. #include <arch.h>
  49.  
  50. /** Thread used to bring up userspace thread.
  51.  *
  52.  * @param arg Pointer to structure containing userspace entry and stack
  53.  *     addresses.
  54.  */
  55. void uinit(void *arg)
  56. {
  57.     uspace_arg_t uarg;
  58.  
  59.     /*
  60.      * So far, we don't have a use for joining userspace threads so we
  61.      * immediately detach each uinit thread. If joining of userspace threads
  62.      * is required, some userspace API based on the kernel mechanism will
  63.      * have to be implemented. Moreover, garbage collecting of threads that
  64.      * didn't detach themselves and nobody else joined them will have to be
  65.      * deployed for the event of forceful task termination.
  66.      */
  67.     thread_detach(THREAD);
  68.    
  69.     uarg.uspace_entry = ((uspace_arg_t *) arg)->uspace_entry;
  70.     uarg.uspace_stack = ((uspace_arg_t *) arg)->uspace_stack;
  71.     uarg.uspace_uarg = ((uspace_arg_t *) arg)->uspace_uarg;
  72.     uarg.uspace_thread_function = NULL; uarg.uspace_thread_arg = NULL;
  73.  
  74.     free((uspace_arg_t *) arg);
  75.     userspace(&uarg);
  76. }
  77.  
  78. /** @}
  79.  */
  80.