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  1. /*
  2.  * Copyright (C) 2006 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. /**
  30.  * @file    cap.c
  31.  * @brief   Capabilities control.
  32.  *
  33.  * @see cap.h
  34.  */
  35.  
  36. #include <security/cap.h>
  37. #include <proc/task.h>
  38. #include <synch/spinlock.h>
  39. #include <arch.h>
  40. #include <typedefs.h>
  41.  
  42. /** Set capabilities.
  43.  *
  44.  * @param t Task whose capabilities are to be changed.
  45.  * @param caps New set of capabilities.
  46.  */
  47. void cap_set(task_t *t, cap_t caps)
  48. {
  49.     ipl_t ipl;
  50.    
  51.     ipl = interrupts_disable();
  52.     spinlock_lock(&t->lock);
  53.    
  54.     t->capabilities = caps;
  55.    
  56.     spinlock_unlock(&t->lock);
  57.     interrupts_restore(ipl);
  58. }
  59.  
  60. /** Get capabilities.
  61.  *
  62.  * @param t Task whose capabilities are to be returned.
  63.  * @return Task's capabilities.
  64.  */
  65. cap_t cap_get(task_t *t)
  66. {
  67.     ipl_t ipl;
  68.     cap_t caps;
  69.    
  70.     ipl = interrupts_disable();
  71.     spinlock_lock(&t->lock);
  72.    
  73.     caps = t->capabilities;
  74.    
  75.     spinlock_unlock(&t->lock);
  76.     interrupts_restore(ipl);
  77.    
  78.     return caps;
  79. }
  80.