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  1. /*
  2.  * Copyright (c) 2001-2004 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 genericproc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_TASK_H_
  36. #define KERN_TASK_H_
  37.  
  38. #include <cpu.h>
  39. #include <synch/spinlock.h>
  40. #include <synch/mutex.h>
  41. #include <synch/rwlock.h>
  42. #include <synch/futex.h>
  43. #include <adt/btree.h>
  44. #include <adt/list.h>
  45. #include <security/cap.h>
  46. #include <arch/proc/task.h>
  47. #include <arch/proc/thread.h>
  48. #include <arch/context.h>
  49. #include <arch/fpu_context.h>
  50. #include <arch/cpu.h>
  51. #include <mm/tlb.h>
  52. #include <proc/scheduler.h>
  53.  
  54. #define IPC_MAX_PHONES  16
  55.  
  56. struct answerbox;
  57. struct task;
  58. struct thread;
  59.  
  60. typedef enum {
  61.     IPC_PHONE_FREE = 0,     /**< Phone is free and can be allocated */
  62.     IPC_PHONE_CONNECTING,   /**< Phone is connecting somewhere */
  63.     IPC_PHONE_CONNECTED,    /**< Phone is connected */
  64.     IPC_PHONE_HUNGUP,   /**< Phone is hung up, waiting for answers to come */
  65.     IPC_PHONE_SLAMMED       /**< Phone was hungup from server */
  66. } ipc_phone_state_t;
  67.  
  68. /** Structure identifying phone (in TASK structure) */
  69. typedef struct {
  70.     SPINLOCK_DECLARE(lock);
  71.     link_t link;
  72.     struct answerbox *callee;
  73.     ipc_phone_state_t state;
  74.     atomic_t active_calls;
  75. } phone_t;
  76.  
  77. typedef struct answerbox {
  78.     SPINLOCK_DECLARE(lock);
  79.  
  80.     struct task *task;
  81.  
  82.     waitq_t wq;
  83.  
  84.     link_t connected_phones;    /**< Phones connected to this answerbox */
  85.     link_t calls;           /**< Received calls */
  86.     link_t dispatched_calls;    /* Should be hash table in the future */
  87.  
  88.     link_t answers;         /**< Answered calls */
  89.  
  90.     SPINLOCK_DECLARE(irq_lock);
  91.     link_t irq_notifs;          /**< Notifications from IRQ handlers */
  92.     link_t irq_head;        /**< IRQs with notifications to this answerbox. */
  93. } answerbox_t;
  94.  
  95. /** Task structure. */
  96. typedef struct task {
  97.     /** Task lock.
  98.      *
  99.      * Must be acquired before threads_lock and thread lock of any of its threads.
  100.      */
  101.     SPINLOCK_DECLARE(lock);
  102.    
  103.     char *name;
  104.     struct thread *main_thread; /**< Pointer to the main thread. */
  105.     link_t th_head;     /**< List of threads contained in this task. */
  106.     as_t *as;       /**< Address space. */
  107.     task_id_t taskid;   /**< Unique identity of task */
  108.     context_id_t context;   /**< Task security context */
  109.  
  110.     /** If this is true, new threads can become part of the task. */
  111.     bool accept_new_threads;
  112.  
  113.     count_t refcount;   /**< Number of references (i.e. threads). */
  114.  
  115.     cap_t capabilities; /**< Task capabilities. */
  116.  
  117.     /* IPC stuff */
  118.     answerbox_t answerbox;  /**< Communication endpoint */
  119.     phone_t phones[IPC_MAX_PHONES];
  120.     atomic_t active_calls;  /**< Active asynchronous messages.
  121.                  *   It is used for limiting uspace to
  122.                  *   certain extent. */
  123.    
  124.     task_arch_t arch;   /**< Architecture specific task data. */
  125.    
  126.     /**
  127.      * Serializes access to the B+tree of task's futexes. This mutex is
  128.      * independent on the task spinlock.
  129.      */
  130.     mutex_t futexes_lock;
  131.     btree_t futexes;    /**< B+tree of futexes referenced by this task. */
  132.    
  133.     uint64_t cycles;    /**< Accumulated accounting. */
  134. } task_t;
  135.  
  136. SPINLOCK_EXTERN(tasks_lock);
  137. extern btree_t tasks_btree;
  138.  
  139. extern void task_init(void);
  140. extern task_t *task_create(as_t *as, char *name);
  141. extern void task_destroy(task_t *t);
  142. extern task_t *task_run_program(void *program_addr, char *name);
  143. extern task_t *task_find_by_id(task_id_t id);
  144. extern int task_kill(task_id_t id);
  145. extern uint64_t task_get_accounting(task_t *t);
  146.  
  147. extern void cap_set(task_t *t, cap_t caps);
  148. extern cap_t cap_get(task_t *t);
  149.  
  150.  
  151. #ifndef task_create_arch
  152. extern void task_create_arch(task_t *t);
  153. #endif
  154.  
  155. #ifndef task_destroy_arch
  156. extern void task_destroy_arch(task_t *t);
  157. #endif
  158.  
  159. extern unative_t sys_task_get_id(task_id_t *uspace_task_id);
  160.  
  161. #endif
  162.  
  163. /** @}
  164.  */
  165.