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