kernel/generic/src/kobject/kobject.c

   1 /*
   2  * Copyright (c) 2017 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 generic
  30  * @{
  31  */
  32 /** @file
  33  */
  34
  35 #include <kobject/kobject.h>
  36 #include <proc/task.h>
  37 #include <synch/spinlock.h>
  38
  39 kobject_t *kobject_get_local(int cap, kobject_type_t type)
  40 {
  41         if ((cap < 0) || (cap >= MAX_KERNEL_OBJECTS))
  42                 return NULL;
  43         if (TASK->kobject[cap].type != type)
  44                 return NULL;
  45         return &TASK->kobject[cap];
  46 }
  47
  48 int kobject_alloc(task_t *task)
  49 {
  50         int cap;
  51
  52         irq_spinlock_lock(&task->lock, true);
  53         for (cap = 0; cap < MAX_KERNEL_OBJECTS; cap++) {
  54                 if (task->kobject[cap].type == KOBJECT_TYPE_INVALID) {
  55                         task->kobject[cap].type = KOBJECT_TYPE_ALLOCATED;
  56                         irq_spinlock_unlock(&task->lock, true);
  57                         return cap;
  58                 }
  59         }
  60         irq_spinlock_unlock(&task->lock, true);
  61
  62         return KOBJECT_INVALID_CAP;
  63 }
  64
  65 void kobject_free(task_t *task, int cap)
  66 {
  67         assert(cap >= 0);
  68         assert(cap < MAX_KERNEL_OBJECTS);
  69         assert(task->kobject[cap].type != KOBJECT_TYPE_INVALID);
  70
  71         irq_spinlock_lock(&task->lock, true);
  72         task->kobject[cap].type = KOBJECT_TYPE_INVALID;
  73         irq_spinlock_unlock(&task->lock, true);
  74 }
  75
  76 /** @}
  77  */