| 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 | #include <abi/errno.h>
|
|---|
| 39 |
|
|---|
| 40 | void kobject_initialize(kobject_t *kobj)
|
|---|
| 41 | {
|
|---|
| 42 | kobj->type = KOBJECT_TYPE_INVALID;
|
|---|
| 43 | kobj->can_reclaim = NULL;
|
|---|
| 44 | }
|
|---|
| 45 |
|
|---|
| 46 | kobject_t *kobject_get(task_t *task, int cap, kobject_type_t type)
|
|---|
| 47 | {
|
|---|
| 48 | if ((cap < 0) || (cap >= MAX_KERNEL_OBJECTS))
|
|---|
| 49 | return NULL;
|
|---|
| 50 | if (task->kobject[cap].type != type)
|
|---|
| 51 | return NULL;
|
|---|
| 52 | return &task->kobject[cap];
|
|---|
| 53 | }
|
|---|
| 54 |
|
|---|
| 55 | kobject_t *kobject_get_current(int cap, kobject_type_t type)
|
|---|
| 56 | {
|
|---|
| 57 | return kobject_get(TASK, cap, type);
|
|---|
| 58 | }
|
|---|
| 59 |
|
|---|
| 60 | int kobject_alloc(task_t *task)
|
|---|
| 61 | {
|
|---|
| 62 | int cap;
|
|---|
| 63 |
|
|---|
| 64 | irq_spinlock_lock(&task->lock, true);
|
|---|
| 65 | for (cap = 0; cap < MAX_KERNEL_OBJECTS; cap++) {
|
|---|
| 66 | kobject_t *kobj = &task->kobject[cap];
|
|---|
| 67 | if (kobj->type > KOBJECT_TYPE_ALLOCATED) {
|
|---|
| 68 | if (kobj->can_reclaim && kobj->can_reclaim(kobj))
|
|---|
| 69 | kobject_initialize(kobj);
|
|---|
| 70 | }
|
|---|
| 71 | if (kobj->type == KOBJECT_TYPE_INVALID) {
|
|---|
| 72 | kobj->type = KOBJECT_TYPE_ALLOCATED;
|
|---|
| 73 | irq_spinlock_unlock(&task->lock, true);
|
|---|
| 74 | return cap;
|
|---|
| 75 | }
|
|---|
| 76 | }
|
|---|
| 77 | irq_spinlock_unlock(&task->lock, true);
|
|---|
| 78 |
|
|---|
| 79 | return ELIMIT;
|
|---|
| 80 | }
|
|---|
| 81 |
|
|---|
| 82 | void kobject_free(task_t *task, int cap)
|
|---|
| 83 | {
|
|---|
| 84 | assert(cap >= 0);
|
|---|
| 85 | assert(cap < MAX_KERNEL_OBJECTS);
|
|---|
| 86 | assert(task->kobject[cap].type != KOBJECT_TYPE_INVALID);
|
|---|
| 87 |
|
|---|
| 88 | irq_spinlock_lock(&task->lock, true);
|
|---|
| 89 | kobject_initialize(&task->kobject[cap]);
|
|---|
| 90 | irq_spinlock_unlock(&task->lock, true);
|
|---|
| 91 | }
|
|---|
| 92 |
|
|---|
| 93 | /** @}
|
|---|
| 94 | */
|
|---|
