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  1. /*
  2.  * Copyright (c) 2006 Ondrej Palkovsky
  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 genericipc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. /* Lock ordering
  36.  *
  37.  * First the answerbox, then the phone.
  38.  */
  39.  
  40. #include <synch/synch.h>
  41. #include <synch/spinlock.h>
  42. #include <synch/mutex.h>
  43. #include <synch/waitq.h>
  44. #include <synch/synch.h>
  45. #include <ipc/ipc.h>
  46. #include <errno.h>
  47. #include <mm/slab.h>
  48. #include <arch.h>
  49. #include <proc/task.h>
  50. #include <memstr.h>
  51. #include <debug.h>
  52.  
  53. #include <print.h>
  54. #include <proc/thread.h>
  55. #include <arch/interrupt.h>
  56. #include <ipc/irq.h>
  57.  
  58. /** Open channel that is assigned automatically to new tasks */
  59. answerbox_t *ipc_phone_0 = NULL;
  60.  
  61. static slab_cache_t *ipc_call_slab;
  62.  
  63. /** Initialize a call structure.
  64.  *
  65.  * @param call      Call structure to be initialized.
  66.  */
  67. static void _ipc_call_init(call_t *call)
  68. {
  69.     memsetb((uintptr_t) call, sizeof(*call), 0);
  70.     call->callerbox = &TASK->answerbox;
  71.     call->sender = TASK;
  72.     call->buffer = NULL;
  73. }
  74.  
  75. /** Allocate and initialize a call structure.
  76.  *
  77.  * The call is initialized, so that the reply will be directed to
  78.  * TASK->answerbox.
  79.  *
  80.  * @param flags     Parameters for slab_alloc (e.g FRAME_ATOMIC).
  81.  *
  82.  * @return      If flags permit it, return NULL, or initialized kernel
  83.  *          call structure.
  84.  */
  85. call_t *ipc_call_alloc(int flags)
  86. {
  87.     call_t *call;
  88.  
  89.     call = slab_alloc(ipc_call_slab, flags);
  90.     _ipc_call_init(call);
  91.  
  92.     return call;
  93. }
  94.  
  95. /** Initialize a statically allocated call structure.
  96.  *
  97.  * @param call      Statically allocated kernel call structure to be
  98.  *          initialized.
  99.  */
  100. void ipc_call_static_init(call_t *call)
  101. {
  102.     _ipc_call_init(call);
  103.     call->flags |= IPC_CALL_STATIC_ALLOC;
  104. }
  105.  
  106. /** Deallocate a call structure.
  107.  *
  108.  * @param call      Call structure to be freed.
  109.  */
  110. void ipc_call_free(call_t *call)
  111. {
  112.     ASSERT(!(call->flags & IPC_CALL_STATIC_ALLOC));
  113.     /* Check to see if we have data in the IPC_M_DATA_SEND buffer. */
  114.     if (call->buffer)
  115.         free(call->buffer);
  116.     slab_free(ipc_call_slab, call);
  117. }
  118.  
  119. /** Initialize an answerbox structure.
  120.  *
  121.  * @param box       Answerbox structure to be initialized.
  122.  * @param task      Task to which the answerbox belongs.
  123.  */
  124. void ipc_answerbox_init(answerbox_t *box, task_t *task)
  125. {
  126.     spinlock_initialize(&box->lock, "ipc_box_lock");
  127.     spinlock_initialize(&box->irq_lock, "ipc_box_irqlock");
  128.     waitq_initialize(&box->wq);
  129.     list_initialize(&box->connected_phones);
  130.     list_initialize(&box->calls);
  131.     list_initialize(&box->dispatched_calls);
  132.     list_initialize(&box->answers);
  133.     list_initialize(&box->irq_notifs);
  134.     list_initialize(&box->irq_head);
  135.     box->task = task;
  136. }
  137.  
  138. /** Connect a phone to an answerbox.
  139.  *
  140.  * @param phone     Initialized phone structure.
  141.  * @param box       Initialized answerbox structure.
  142.  */
  143. void ipc_phone_connect(phone_t *phone, answerbox_t *box)
  144. {
  145.     mutex_lock(&phone->lock);
  146.  
  147.     phone->state = IPC_PHONE_CONNECTED;
  148.     phone->callee = box;
  149.  
  150.     spinlock_lock(&box->lock);
  151.     list_append(&phone->link, &box->connected_phones);
  152.     spinlock_unlock(&box->lock);
  153.  
  154.     mutex_unlock(&phone->lock);
  155. }
  156.  
  157. /** Initialize a phone structure.
  158.  *
  159.  * @param phone     Phone structure to be initialized.
  160.  */
  161. void ipc_phone_init(phone_t *phone)
  162. {
  163.     mutex_initialize(&phone->lock);
  164.     phone->callee = NULL;
  165.     phone->state = IPC_PHONE_FREE;
  166.     atomic_set(&phone->active_calls, 0);
  167. }
  168.  
  169. /** Helper function to facilitate synchronous calls.
  170.  *
  171.  * @param phone     Destination kernel phone structure.
  172.  * @param request   Call structure with request.
  173.  */
  174. void ipc_call_sync(phone_t *phone, call_t *request)
  175. {
  176.     answerbox_t sync_box;
  177.  
  178.     ipc_answerbox_init(&sync_box, TASK);
  179.  
  180.     /* We will receive data in a special box. */
  181.     request->callerbox = &sync_box;
  182.  
  183.     ipc_call(phone, request);
  184.     ipc_wait_for_call(&sync_box, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE);
  185. }
  186.  
  187. /** Answer a message which was not dispatched and is not listed in any queue.
  188.  *
  189.  * @param call      Call structure to be answered.
  190.  */
  191. static void _ipc_answer_free_call(call_t *call)
  192. {
  193.     answerbox_t *callerbox = call->callerbox;
  194.  
  195.     call->flags |= IPC_CALL_ANSWERED;
  196.  
  197.     spinlock_lock(&callerbox->lock);
  198.     list_append(&call->link, &callerbox->answers);
  199.     spinlock_unlock(&callerbox->lock);
  200.     waitq_wakeup(&callerbox->wq, WAKEUP_FIRST);
  201. }
  202.  
  203. /** Answer a message which is in a callee queue.
  204.  *
  205.  * @param box       Answerbox that is answering the message.
  206.  * @param call      Modified request that is being sent back.
  207.  */
  208. void ipc_answer(answerbox_t *box, call_t *call)
  209. {
  210.     /* Remove from active box */
  211.     spinlock_lock(&box->lock);
  212.     list_remove(&call->link);
  213.     spinlock_unlock(&box->lock);
  214.     /* Send back answer */
  215.     _ipc_answer_free_call(call);
  216. }
  217.  
  218. /** Simulate sending back a message.
  219.  *
  220.  * Most errors are better handled by forming a normal backward
  221.  * message and sending it as a normal answer.
  222.  *
  223.  * @param phone     Phone structure the call should appear to come from.
  224.  * @param call      Call structure to be answered.
  225.  * @param err       Return value to be used for the answer.
  226.  */
  227. void ipc_backsend_err(phone_t *phone, call_t *call, unative_t err)
  228. {
  229.     call->data.phone = phone;
  230.     atomic_inc(&phone->active_calls);
  231.     IPC_SET_RETVAL(call->data, err);
  232.     _ipc_answer_free_call(call);
  233. }
  234.  
  235. /** Unsafe unchecking version of ipc_call.
  236.  *
  237.  * @param phone     Phone structure the call comes from.
  238.  * @param box       Destination answerbox structure.
  239.  * @param call      Call structure with request.
  240.  */
  241. static void _ipc_call(phone_t *phone, answerbox_t *box, call_t *call)
  242. {
  243.     if (!(call->flags & IPC_CALL_FORWARDED)) {
  244.         atomic_inc(&phone->active_calls);
  245.         call->data.phone = phone;
  246.     }
  247.  
  248.     spinlock_lock(&box->lock);
  249.     list_append(&call->link, &box->calls);
  250.     spinlock_unlock(&box->lock);
  251.     waitq_wakeup(&box->wq, WAKEUP_FIRST);
  252. }
  253.  
  254. /** Send an asynchronous request using a phone to an answerbox.
  255.  *
  256.  * @param phone     Phone structure the call comes from and which is
  257.  *          connected to the destination answerbox.
  258.  * @param call      Call structure with request.
  259.  *
  260.  * @return      Return 0 on success, ENOENT on error.
  261.  */
  262. int ipc_call(phone_t *phone, call_t *call)
  263. {
  264.     answerbox_t *box;
  265.  
  266.     mutex_lock(&phone->lock);
  267.     if (phone->state != IPC_PHONE_CONNECTED) {
  268.         mutex_unlock(&phone->lock);
  269.         if (call->flags & IPC_CALL_FORWARDED) {
  270.             IPC_SET_RETVAL(call->data, EFORWARD);
  271.             _ipc_answer_free_call(call);
  272.         } else {
  273.             if (phone->state == IPC_PHONE_HUNGUP)
  274.                 ipc_backsend_err(phone, call, EHANGUP);
  275.             else
  276.                 ipc_backsend_err(phone, call, ENOENT);
  277.         }
  278.         return ENOENT;
  279.     }
  280.     box = phone->callee;
  281.     _ipc_call(phone, box, call);
  282.    
  283.     mutex_unlock(&phone->lock);
  284.     return 0;
  285. }
  286.  
  287. /** Disconnect phone from answerbox.
  288.  *
  289.  * This call leaves the phone in the HUNGUP state. The change to 'free' is done
  290.  * lazily later.
  291.  *
  292.  * @param phone     Phone structure to be hung up.
  293.  *              
  294.  * @return      Return 0 if the phone is disconnected.
  295.  *          Return -1 if the phone was already disconnected.
  296.  */
  297. int ipc_phone_hangup(phone_t *phone)
  298. {
  299.     answerbox_t *box;
  300.     call_t *call;
  301.    
  302.     mutex_lock(&phone->lock);
  303.     if (phone->state == IPC_PHONE_FREE ||
  304.         phone->state == IPC_PHONE_HUNGUP ||
  305.         phone->state == IPC_PHONE_CONNECTING) {
  306.         mutex_unlock(&phone->lock);
  307.         return -1;
  308.     }
  309.     box = phone->callee;
  310.     if (phone->state != IPC_PHONE_SLAMMED) {
  311.         /* Remove myself from answerbox */
  312.         spinlock_lock(&box->lock);
  313.         list_remove(&phone->link);
  314.         spinlock_unlock(&box->lock);
  315.  
  316.         if (phone->state != IPC_PHONE_SLAMMED) {
  317.             call = ipc_call_alloc(0);
  318.             IPC_SET_METHOD(call->data, IPC_M_PHONE_HUNGUP);
  319.             call->flags |= IPC_CALL_DISCARD_ANSWER;
  320.             _ipc_call(phone, box, call);
  321.         }
  322.     }
  323.  
  324.     phone->state = IPC_PHONE_HUNGUP;
  325.     mutex_unlock(&phone->lock);
  326.  
  327.     return 0;
  328. }
  329.  
  330. /** Forwards call from one answerbox to another one.
  331.  *
  332.  * @param call      Call structure to be redirected.
  333.  * @param newphone  Phone structure to target answerbox.
  334.  * @param oldbox    Old answerbox structure.
  335.  * @param mode      Flags that specify mode of the forward operation.
  336.  *
  337.  * @return      Return 0 if forwarding succeeded or an error code if
  338.  *          there was error.
  339.  *
  340.  * The return value serves only as an information for the forwarder,
  341.  * the original caller is notified automatically with EFORWARD.
  342.  */
  343. int ipc_forward(call_t *call, phone_t *newphone, answerbox_t *oldbox, int mode)
  344. {
  345.     spinlock_lock(&oldbox->lock);
  346.     list_remove(&call->link);
  347.     spinlock_unlock(&oldbox->lock);
  348.  
  349.     if (mode & IPC_FF_ROUTE_FROM_ME)
  350.         call->data.phone = newphone;
  351.  
  352.     return ipc_call(newphone, call);
  353. }
  354.  
  355.  
  356. /** Wait for a phone call.
  357.  *
  358.  * @param box       Answerbox expecting the call.
  359.  * @param usec      Timeout in microseconds. See documentation for
  360.  *          waitq_sleep_timeout() for decription of its special
  361.  *          meaning.
  362.  * @param flags     Select mode of sleep operation. See documentation for
  363.  *          waitq_sleep_timeout() for description of its special
  364.  *          meaning.
  365.  * @return      Recived call structure or NULL.
  366.  *
  367.  * To distinguish between a call and an answer, have a look at call->flags.
  368.  */
  369. call_t *ipc_wait_for_call(answerbox_t *box, uint32_t usec, int flags)
  370. {
  371.     call_t *request;
  372.     ipl_t ipl;
  373.     int rc;
  374.  
  375. restart:
  376.     rc = waitq_sleep_timeout(&box->wq, usec, flags);
  377.     if (SYNCH_FAILED(rc))
  378.         return NULL;
  379.    
  380.     spinlock_lock(&box->lock);
  381.     if (!list_empty(&box->irq_notifs)) {
  382.         ipl = interrupts_disable();
  383.         spinlock_lock(&box->irq_lock);
  384.  
  385.         request = list_get_instance(box->irq_notifs.next, call_t, link);
  386.         list_remove(&request->link);
  387.  
  388.         spinlock_unlock(&box->irq_lock);
  389.         interrupts_restore(ipl);
  390.     } else if (!list_empty(&box->answers)) {
  391.         /* Handle asynchronous answers */
  392.         request = list_get_instance(box->answers.next, call_t, link);
  393.         list_remove(&request->link);
  394.         atomic_dec(&request->data.phone->active_calls);
  395.     } else if (!list_empty(&box->calls)) {
  396.         /* Handle requests */
  397.         request = list_get_instance(box->calls.next, call_t, link);
  398.         list_remove(&request->link);
  399.         /* Append request to dispatch queue */
  400.         list_append(&request->link, &box->dispatched_calls);
  401.     } else {
  402.         /* This can happen regularly after ipc_cleanup */
  403.         spinlock_unlock(&box->lock);
  404.         goto restart;
  405.     }
  406.     spinlock_unlock(&box->lock);
  407.     return request;
  408. }
  409.  
  410. /** Answer all calls from list with EHANGUP answer.
  411.  *
  412.  * @param lst       Head of the list to be cleaned up.
  413.  */
  414. static void ipc_cleanup_call_list(link_t *lst)
  415. {
  416.     call_t *call;
  417.  
  418.     while (!list_empty(lst)) {
  419.         call = list_get_instance(lst->next, call_t, link);
  420.         if (call->buffer)
  421.             free(call->buffer);
  422.         list_remove(&call->link);
  423.  
  424.         IPC_SET_RETVAL(call->data, EHANGUP);
  425.         _ipc_answer_free_call(call);
  426.     }
  427. }
  428.  
  429. /** Cleans up all IPC communication of the current task.
  430.  *
  431.  * Note: ipc_hangup sets returning answerbox to TASK->answerbox, you
  432.  * have to change it as well if you want to cleanup other tasks than TASK.
  433.  */
  434. void ipc_cleanup(void)
  435. {
  436.     int i;
  437.     call_t *call;
  438.     phone_t *phone;
  439.     DEADLOCK_PROBE_INIT(p_phonelck);
  440.  
  441.     /* Disconnect all our phones ('ipc_phone_hangup') */
  442.     for (i = 0; i < IPC_MAX_PHONES; i++)
  443.         ipc_phone_hangup(&TASK->phones[i]);
  444.  
  445.     /* Disconnect all connected irqs */
  446.     ipc_irq_cleanup(&TASK->answerbox);
  447.  
  448.     /* Disconnect all phones connected to our answerbox */
  449. restart_phones:
  450.     spinlock_lock(&TASK->answerbox.lock);
  451.     while (!list_empty(&TASK->answerbox.connected_phones)) {
  452.         phone = list_get_instance(TASK->answerbox.connected_phones.next,
  453.             phone_t, link);
  454.         if (SYNCH_FAILED(mutex_trylock(&phone->lock))) {
  455.             spinlock_unlock(&TASK->answerbox.lock);
  456.             DEADLOCK_PROBE(p_phonelck, DEADLOCK_THRESHOLD);
  457.             goto restart_phones;
  458.         }
  459.        
  460.         /* Disconnect phone */
  461.         ASSERT(phone->state == IPC_PHONE_CONNECTED);
  462.         phone->state = IPC_PHONE_SLAMMED;
  463.         list_remove(&phone->link);
  464.  
  465.         mutex_unlock(&phone->lock);
  466.     }
  467.  
  468.     /* Answer all messages in 'calls' and 'dispatched_calls' queues */
  469.     ipc_cleanup_call_list(&TASK->answerbox.dispatched_calls);
  470.     ipc_cleanup_call_list(&TASK->answerbox.calls);
  471.     spinlock_unlock(&TASK->answerbox.lock);
  472.    
  473.     /* Wait for all async answers to arrive */
  474.     while (1) {
  475.         /* Go through all phones, until all are FREE... */
  476.         /* Locking not needed, no one else should modify
  477.          * it, when we are in cleanup */
  478.         for (i = 0; i < IPC_MAX_PHONES; i++) {
  479.             if (TASK->phones[i].state == IPC_PHONE_HUNGUP &&
  480.                 atomic_get(&TASK->phones[i].active_calls) == 0)
  481.                 TASK->phones[i].state = IPC_PHONE_FREE;
  482.            
  483.             /* Just for sure, we might have had some
  484.              * IPC_PHONE_CONNECTING phones */
  485.             if (TASK->phones[i].state == IPC_PHONE_CONNECTED)
  486.                 ipc_phone_hangup(&TASK->phones[i]);
  487.             /* If the hangup succeeded, it has sent a HANGUP
  488.              * message, the IPC is now in HUNGUP state, we
  489.              * wait for the reply to come */
  490.            
  491.             if (TASK->phones[i].state != IPC_PHONE_FREE)
  492.                 break;
  493.         }
  494.         /* Voila, got into cleanup */
  495.         if (i == IPC_MAX_PHONES)
  496.             break;
  497.        
  498.         call = ipc_wait_for_call(&TASK->answerbox, SYNCH_NO_TIMEOUT,
  499.             SYNCH_FLAGS_NONE);
  500.         ASSERT((call->flags & IPC_CALL_ANSWERED) ||
  501.             (call->flags & IPC_CALL_NOTIF));
  502.         ASSERT(!(call->flags & IPC_CALL_STATIC_ALLOC));
  503.        
  504.         atomic_dec(&TASK->active_calls);
  505.         ipc_call_free(call);
  506.     }
  507. }
  508.  
  509.  
  510. /** Initilize IPC subsystem */
  511. void ipc_init(void)
  512. {
  513.     ipc_call_slab = slab_cache_create("ipc_call", sizeof(call_t), 0, NULL,
  514.         NULL, 0);
  515. }
  516.  
  517.  
  518. /** List answerbox contents.
  519.  *
  520.  * @param taskid    Task ID.
  521.  */
  522. void ipc_print_task(task_id_t taskid)
  523. {
  524.     task_t *task;
  525.     int i;
  526.     call_t *call;
  527.     link_t *tmp;
  528.    
  529.     spinlock_lock(&tasks_lock);
  530.     task = task_find_by_id(taskid);
  531.     if (task)
  532.         spinlock_lock(&task->lock);
  533.     spinlock_unlock(&tasks_lock);
  534.     if (!task)
  535.         return;
  536.  
  537.     /* Print opened phones & details */
  538.     printf("PHONE:\n");
  539.     for (i = 0; i < IPC_MAX_PHONES; i++) {
  540.         if (SYNCH_FAILED(mutex_trylock(&task->phones[i].lock))) {
  541.             printf("%d: mutex busy\n", i);
  542.             continue;
  543.         }
  544.         if (task->phones[i].state != IPC_PHONE_FREE) {
  545.             printf("%d: ", i);
  546.             switch (task->phones[i].state) {
  547.             case IPC_PHONE_CONNECTING:
  548.                 printf("connecting ");
  549.                 break;
  550.             case IPC_PHONE_CONNECTED:
  551.                 printf("connected to: %p ",
  552.                        task->phones[i].callee);
  553.                 break;
  554.             case IPC_PHONE_SLAMMED:
  555.                 printf("slammed by: %p ",
  556.                        task->phones[i].callee);
  557.                 break;
  558.             case IPC_PHONE_HUNGUP:
  559.                 printf("hung up - was: %p ",
  560.                        task->phones[i].callee);
  561.                 break;
  562.             default:
  563.                 break;
  564.             }
  565.             printf("active: %d\n",
  566.                 atomic_get(&task->phones[i].active_calls));
  567.         }
  568.         mutex_unlock(&task->phones[i].lock);
  569.     }
  570.  
  571.  
  572.     /* Print answerbox - calls */
  573.     spinlock_lock(&task->answerbox.lock);
  574.     printf("ABOX - CALLS:\n");
  575.     for (tmp = task->answerbox.calls.next; tmp != &task->answerbox.calls;
  576.         tmp = tmp->next) {
  577.         call = list_get_instance(tmp, call_t, link);
  578.         printf("Callid: %p Srctask:%llu M:%d A1:%d A2:%d A3:%d "
  579.             "A4:%d A5:%d Flags:%x\n", call, call->sender->taskid,
  580.             IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
  581.             IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data),
  582.             IPC_GET_ARG4(call->data), IPC_GET_ARG5(call->data),
  583.             call->flags);
  584.     }
  585.     /* Print answerbox - calls */
  586.     printf("ABOX - DISPATCHED CALLS:\n");
  587.     for (tmp = task->answerbox.dispatched_calls.next;
  588.          tmp != &task->answerbox.dispatched_calls;
  589.          tmp = tmp->next) {
  590.         call = list_get_instance(tmp, call_t, link);
  591.         printf("Callid: %p Srctask:%llu M:%d A1:%d A2:%d A3:%d "
  592.             "A4:%d A5:%d Flags:%x\n", call, call->sender->taskid,
  593.             IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
  594.             IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data),
  595.             IPC_GET_ARG4(call->data), IPC_GET_ARG5(call->data),
  596.             call->flags);
  597.     }
  598.     /* Print answerbox - calls */
  599.     printf("ABOX - ANSWERS:\n");
  600.     for (tmp = task->answerbox.answers.next; tmp != &task->answerbox.answers;
  601.         tmp = tmp->next) {
  602.         call = list_get_instance(tmp, call_t, link);
  603.         printf("Callid:%p M:%d A1:%d A2:%d A3:%d A4:%d A5:%d Flags:%x\n",
  604.             call, IPC_GET_METHOD(call->data), IPC_GET_ARG1(call->data),
  605.             IPC_GET_ARG2(call->data), IPC_GET_ARG3(call->data),
  606.             IPC_GET_ARG4(call->data), IPC_GET_ARG5(call->data),
  607.             call->flags);
  608.     }
  609.  
  610.     spinlock_unlock(&task->answerbox.lock);
  611.     spinlock_unlock(&task->lock);
  612. }
  613.  
  614. /** @}
  615.  */
  616.