kernel/generic/src/proc/current.c

   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 kernel_generic_proc
  30  * @{
  31  */
  32
  33 /**
  34  * @file
  35  * @brief CURRENT structure functions.
  36  *
  37  * This file contains functions to manage the CURRENT structure.
  38  * The CURRENT structure exists at the base address of every kernel
  39  * stack and carries information about current settings
  40  * (e.g. current CPU, current thread, task and address space
  41  * and current preemption counter).
  42  */
  43
  44 #include <arch.h>
  45 #include <assert.h>
  46
  47 /** Initialize CURRENT structure
  48  *
  49  * Initialize CURRENT structure passed as argument.
  50  *
  51  * @param the CURRENT structure to be initialized.
  52  *
  53  */
  54 void current_initialize(current_t *the)
  55 {
  56         the->preemption = 0;
  57         the->cpu = NULL;
  58         the->thread = NULL;
  59         the->task = NULL;
  60         the->as = NULL;
  61         the->magic = MAGIC;
  62 }
  63
  64 /** Copy CURRENT structure
  65  *
  66  * Copy the source CURRENT structure to the destination CURRENT structure.
  67  *
  68  * @param src The source CURRENT structure.
  69  * @param dst The destination CURRENT structure.
  70  *
  71  */
  72 NO_TRACE void current_copy(current_t *src, current_t *dst)
  73 {
  74         assert(src->magic == MAGIC);
  75         *dst = *src;
  76 }
  77
  78 /** @}
  79  */