| 1 | /*
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| 2 | * Copyright (c) 2017 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup generic
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #ifndef KERN_CAP_H_
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| 36 | #define KERN_CAP_H_
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| 37 |
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| 38 | #include <typedefs.h>
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| 39 | #include <adt/list.h>
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| 40 | #include <adt/hash.h>
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| 41 | #include <adt/hash_table.h>
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| 42 | #include <lib/ra.h>
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| 43 | #include <synch/mutex.h>
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| 44 | #include <atomic.h>
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| 45 |
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| 46 | typedef int cap_handle_t;
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| 47 |
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| 48 | typedef enum {
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| 49 | CAP_STATE_FREE,
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| 50 | CAP_STATE_ALLOCATED,
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| 51 | CAP_STATE_PUBLISHED
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| 52 | } cap_state_t;
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| 53 |
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| 54 | typedef enum {
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| 55 | KOBJECT_TYPE_PHONE,
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| 56 | KOBJECT_TYPE_IRQ,
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| 57 | KOBJECT_TYPE_MAX
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| 58 | } kobject_type_t;
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| 59 |
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| 60 | struct task;
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| 61 | struct phone;
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| 62 | struct irq;
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| 63 |
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| 64 | struct kobject;
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| 65 | typedef struct kobject_ops {
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| 66 | bool (*reclaim)(struct kobject *);
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| 67 | void (*destroy)(void *);
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| 68 | } kobject_ops_t;
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| 69 |
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| 70 | /*
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| 71 | * Everything in kobject_t except for the atomic reference count is imutable.
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| 72 | */
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| 73 | typedef struct kobject {
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| 74 | kobject_type_t type;
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| 75 | atomic_t refcnt;
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| 76 |
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| 77 | kobject_ops_t *ops;
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| 78 |
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| 79 | union {
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| 80 | void *raw;
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| 81 | struct phone *phone;
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| 82 | struct irq *irq;
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| 83 | };
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| 84 | } kobject_t;
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| 85 |
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| 86 | /*
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| 87 | * A cap_t may only be accessed under the protection of the cap_info_t lock.
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| 88 | */
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| 89 | typedef struct cap {
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| 90 | cap_state_t state;
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| 91 |
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| 92 | struct task *task;
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| 93 | cap_handle_t handle;
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| 94 |
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| 95 | /* Link to the task's capabilities of the same kobject type. */
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| 96 | link_t type_link;
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| 97 |
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| 98 | ht_link_t caps_link;
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| 99 |
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| 100 | /* The underlying kernel object. */
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| 101 | kobject_t *kobject;
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| 102 | } cap_t;
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| 103 |
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| 104 | typedef struct cap_info {
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| 105 | mutex_t lock;
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| 106 |
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| 107 | list_t type_list[KOBJECT_TYPE_MAX];
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| 108 |
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| 109 | hash_table_t caps;
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| 110 | ra_arena_t *handles;
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| 111 | } cap_info_t;
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| 112 |
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| 113 | extern void caps_init(void);
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| 114 | extern int caps_task_alloc(struct task *);
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| 115 | extern void caps_task_free(struct task *);
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| 116 | extern void caps_task_init(struct task *);
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| 117 | extern bool caps_apply_to_kobject_type(struct task *, kobject_type_t,
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| 118 | bool (*)(cap_t *, void *), void *);
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| 119 |
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| 120 | extern cap_handle_t cap_alloc(struct task *);
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| 121 | extern void cap_publish(struct task *, cap_handle_t, kobject_t *);
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| 122 | extern kobject_t *cap_unpublish(struct task *, cap_handle_t, kobject_type_t);
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| 123 | extern void cap_free(struct task *, cap_handle_t);
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| 124 |
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| 125 | extern void kobject_initialize(kobject_t *, kobject_type_t, void *,
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| 126 | kobject_ops_t *);
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| 127 | extern kobject_t *kobject_get(struct task *, cap_handle_t, kobject_type_t);
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| 128 | extern void kobject_add_ref(kobject_t *);
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| 129 | extern void kobject_put(kobject_t *);
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| 130 |
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| 131 | #endif
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| 132 |
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| 133 | /** @}
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| 134 | */
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