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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. #include <arch.h>
  36. #include <proc/task.h>
  37. #include <proc/thread.h>
  38. #include <errno.h>
  39. #include <memstr.h>
  40. #include <debug.h>
  41. #include <ipc/ipc.h>
  42. #include <ipc/sysipc.h>
  43. #include <ipc/irq.h>
  44. #include <ipc/ipcrsc.h>
  45. #include <ipc/kbox.h>
  46. #include <udebug/udebug_ipc.h>
  47. #include <arch/interrupt.h>
  48. #include <syscall/copy.h>
  49. #include <security/cap.h>
  50. #include <mm/as.h>
  51. #include <print.h>
  52.  
  53. /**
  54.  * Maximum buffer size allowed for IPC_M_DATA_WRITE and IPC_M_DATA_READ
  55.  * requests.
  56.  */
  57. #define DATA_XFER_LIMIT     (64 * 1024)
  58.  
  59. #define GET_CHECK_PHONE(phone, phoneid, err) \
  60. { \
  61.     if (phoneid > IPC_MAX_PHONES) { \
  62.         err; \
  63.     } \
  64.     phone = &TASK->phones[phoneid]; \
  65. }
  66.  
  67. #define STRUCT_TO_USPACE(dst, src)  copy_to_uspace(dst, src, sizeof(*(src)))
  68.  
  69. /** Decide if the method is a system method.
  70.  *
  71.  * @param method    Method to be decided.
  72.  *
  73.  * @return      Return 1 if the method is a system method.
  74.  *          Otherwise return 0.
  75.  */
  76. static inline int method_is_system(unative_t method)
  77. {
  78.     if (method <= IPC_M_LAST_SYSTEM)
  79.         return 1;
  80.     return 0;
  81. }
  82.  
  83. /** Decide if the message with this method is forwardable.
  84.  *
  85.  * - some system messages may be forwarded, for some of them
  86.  *   it is useless
  87.  *
  88.  * @param method    Method to be decided.
  89.  *
  90.  * @return      Return 1 if the method is forwardable.
  91.  *          Otherwise return 0.
  92.  */
  93. static inline int method_is_forwardable(unative_t method)
  94. {
  95.     switch (method) {
  96.     case IPC_M_CONNECTION_CLONE:
  97.     case IPC_M_CONNECT_ME:
  98.     case IPC_M_PHONE_HUNGUP:
  99.         /* This message is meant only for the original recipient. */
  100.         return 0;
  101.     default:
  102.         return 1;
  103.     }
  104. }
  105.  
  106. /** Decide if the message with this method is immutable on forward.
  107.  *
  108.  * - some system messages may be forwarded but their content cannot be altered
  109.  *
  110.  * @param method    Method to be decided.
  111.  *
  112.  * @return      Return 1 if the method is immutable on forward.
  113.  *          Otherwise return 0.
  114.  */
  115. static inline int method_is_immutable(unative_t method)
  116. {
  117.     switch (method) {
  118.     case IPC_M_SHARE_OUT:
  119.     case IPC_M_SHARE_IN:
  120.     case IPC_M_DATA_WRITE:
  121.     case IPC_M_DATA_READ:
  122.         return 1;
  123.         break;
  124.     default:
  125.         return 0;
  126.     }
  127. }
  128.  
  129.  
  130. /***********************************************************************
  131.  * Functions that preprocess answer before sending it to the recepient.
  132.  ***********************************************************************/
  133.  
  134. /** Decide if the caller (e.g. ipc_answer()) should save the old call contents
  135.  * for answer_preprocess().
  136.  *
  137.  * @param call      Call structure to be decided.
  138.  *
  139.  * @return      Return 1 if the old call contents should be saved.
  140.  *          Return 0 otherwise.
  141.  */
  142. static inline int answer_need_old(call_t *call)
  143. {
  144.     switch (IPC_GET_METHOD(call->data)) {
  145.     case IPC_M_CONNECTION_CLONE:
  146.     case IPC_M_CONNECT_ME:
  147.     case IPC_M_CONNECT_TO_ME:
  148.     case IPC_M_CONNECT_ME_TO:
  149.     case IPC_M_SHARE_OUT:
  150.     case IPC_M_SHARE_IN:
  151.     case IPC_M_DATA_WRITE:
  152.     case IPC_M_DATA_READ:
  153.         return 1;
  154.     default:
  155.         return 0;
  156.     }
  157. }
  158.  
  159. /** Interpret process answer as control information.
  160.  *
  161.  * This function is called directly after sys_ipc_answer().
  162.  *
  163.  * @param answer    Call structure with the answer.
  164.  * @param olddata   Saved data of the request.
  165.  *
  166.  * @return      Return 0 on success or an error code.
  167.  */
  168. static inline int answer_preprocess(call_t *answer, ipc_data_t *olddata)
  169. {
  170.     int phoneid;
  171.  
  172.     if ((native_t) IPC_GET_RETVAL(answer->data) == EHANGUP) {
  173.         /* In case of forward, hangup the forwared phone,
  174.          * not the originator
  175.          */
  176.         mutex_lock(&answer->data.phone->lock);
  177.         spinlock_lock(&TASK->answerbox.lock);
  178.         if (answer->data.phone->state == IPC_PHONE_CONNECTED) {
  179.             list_remove(&answer->data.phone->link);
  180.             answer->data.phone->state = IPC_PHONE_SLAMMED;
  181.         }
  182.         spinlock_unlock(&TASK->answerbox.lock);
  183.         mutex_unlock(&answer->data.phone->lock);
  184.     }
  185.  
  186.     if (!olddata)
  187.         return 0;
  188.  
  189.     if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECTION_CLONE) {
  190.         phoneid = IPC_GET_ARG1(*olddata);
  191.         phone_t *phone = &TASK->phones[phoneid];
  192.         if (IPC_GET_RETVAL(answer->data) != EOK) {
  193.             /*
  194.              * The recipient of the cloned phone rejected the offer.
  195.              * In this case, the connection was established at the
  196.              * request time and therefore we need to slam the phone.
  197.              * We don't merely hangup as that would result in
  198.              * sending IPC_M_HUNGUP to the third party on the
  199.              * other side of the cloned phone.
  200.              */
  201.             mutex_lock(&phone->lock);
  202.             if (phone->state == IPC_PHONE_CONNECTED) {
  203.                 spinlock_lock(&phone->callee->lock);
  204.                 list_remove(&phone->link);
  205.                 phone->state = IPC_PHONE_SLAMMED;
  206.                 spinlock_unlock(&phone->callee->lock);
  207.             }
  208.             mutex_unlock(&phone->lock);
  209.         }
  210.     } else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME) {
  211.         phone_t *phone = (phone_t *)IPC_GET_ARG5(*olddata);
  212.         if (IPC_GET_RETVAL(answer->data) != EOK) {
  213.             /*
  214.              * The other party on the cloned phoned rejected our
  215.              * request for connection on the protocol level.
  216.              * We need to break the connection without sending
  217.              * IPC_M_HUNGUP back.
  218.              */
  219.             mutex_lock(&phone->lock);
  220.             if (phone->state == IPC_PHONE_CONNECTED) {
  221.                 spinlock_lock(&phone->callee->lock);
  222.                 list_remove(&phone->link);
  223.                 phone->state = IPC_PHONE_SLAMMED;
  224.                 spinlock_unlock(&phone->callee->lock);
  225.             }
  226.             mutex_unlock(&phone->lock);
  227.         }
  228.     } else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
  229.         phoneid = IPC_GET_ARG5(*olddata);
  230.         if (IPC_GET_RETVAL(answer->data) != EOK) {
  231.             /* The connection was not accepted */
  232.             phone_dealloc(phoneid);
  233.         } else {
  234.             /* The connection was accepted */
  235.             phone_connect(phoneid, &answer->sender->answerbox);
  236.             /* Set 'phone hash' as arg5 of response */
  237.             IPC_SET_ARG5(answer->data,
  238.                 (unative_t) &TASK->phones[phoneid]);
  239.         }
  240.     } else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
  241.         /* If the users accepted call, connect */
  242.         if (IPC_GET_RETVAL(answer->data) == EOK) {
  243.             ipc_phone_connect((phone_t *) IPC_GET_ARG5(*olddata),
  244.                 &TASK->answerbox);
  245.         }
  246.     } else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_OUT) {
  247.         if (!IPC_GET_RETVAL(answer->data)) {
  248.             /* Accepted, handle as_area receipt */
  249.             ipl_t ipl;
  250.             int rc;
  251.             as_t *as;
  252.            
  253.             ipl = interrupts_disable();
  254.             spinlock_lock(&answer->sender->lock);
  255.             as = answer->sender->as;
  256.             spinlock_unlock(&answer->sender->lock);
  257.             interrupts_restore(ipl);
  258.            
  259.             rc = as_area_share(as, IPC_GET_ARG1(*olddata),
  260.                 IPC_GET_ARG2(*olddata), AS,
  261.                 IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));
  262.             IPC_SET_RETVAL(answer->data, rc);
  263.             return rc;
  264.         }
  265.     } else if (IPC_GET_METHOD(*olddata) == IPC_M_SHARE_IN) {
  266.         if (!IPC_GET_RETVAL(answer->data)) {
  267.             ipl_t ipl;
  268.             as_t *as;
  269.             int rc;
  270.            
  271.             ipl = interrupts_disable();
  272.             spinlock_lock(&answer->sender->lock);
  273.             as = answer->sender->as;
  274.             spinlock_unlock(&answer->sender->lock);
  275.             interrupts_restore(ipl);
  276.            
  277.             rc = as_area_share(AS, IPC_GET_ARG1(answer->data),
  278.                 IPC_GET_ARG2(*olddata), as, IPC_GET_ARG1(*olddata),
  279.                 IPC_GET_ARG2(answer->data));
  280.             IPC_SET_RETVAL(answer->data, rc);
  281.         }
  282.     } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_READ) {
  283.         ASSERT(!answer->buffer);
  284.         if (!IPC_GET_RETVAL(answer->data)) {
  285.             /* The recipient agreed to send data. */
  286.             uintptr_t src = IPC_GET_ARG1(answer->data);
  287.             uintptr_t dst = IPC_GET_ARG1(*olddata);
  288.             size_t max_size = IPC_GET_ARG2(*olddata);
  289.             size_t size = IPC_GET_ARG2(answer->data);
  290.             if (size && size <= max_size) {
  291.                 /*
  292.                  * Copy the destination VA so that this piece of
  293.                  * information is not lost.
  294.                  */
  295.                 IPC_SET_ARG1(answer->data, dst);
  296.  
  297.                 answer->buffer = malloc(size, 0);
  298.                 int rc = copy_from_uspace(answer->buffer,
  299.                     (void *) src, size);
  300.                 if (rc) {
  301.                     IPC_SET_RETVAL(answer->data, rc);
  302.                     free(answer->buffer);
  303.                     answer->buffer = NULL;
  304.                 }
  305.             } else if (!size) {
  306.                 IPC_SET_RETVAL(answer->data, EOK);
  307.             } else {
  308.                 IPC_SET_RETVAL(answer->data, ELIMIT);
  309.             }
  310.         }
  311.     } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_WRITE) {
  312.         ASSERT(answer->buffer);
  313.         if (!IPC_GET_RETVAL(answer->data)) {
  314.             /* The recipient agreed to receive data. */
  315.             int rc;
  316.             uintptr_t dst;
  317.             size_t size;
  318.             size_t max_size;
  319.  
  320.             dst = (uintptr_t)IPC_GET_ARG1(answer->data);
  321.             size = (size_t)IPC_GET_ARG2(answer->data);
  322.             max_size = (size_t)IPC_GET_ARG2(*olddata);
  323.  
  324.             if (size <= max_size) {
  325.                 rc = copy_to_uspace((void *) dst,
  326.                     answer->buffer, size);
  327.                 if (rc)
  328.                     IPC_SET_RETVAL(answer->data, rc);
  329.             } else {
  330.                 IPC_SET_RETVAL(answer->data, ELIMIT);
  331.             }
  332.         }
  333.         free(answer->buffer);
  334.         answer->buffer = NULL;
  335.     }
  336.     return 0;
  337. }
  338.  
  339. /** Called before the request is sent.
  340.  *
  341.  * @param call      Call structure with the request.
  342.  * @param phone     Phone that the call will be sent through.
  343.  *
  344.  * @return      Return 0 on success, ELIMIT or EPERM on error.
  345.  */
  346. static int request_preprocess(call_t *call, phone_t *phone)
  347. {
  348.     int newphid;
  349.     size_t size;
  350.     uintptr_t src;
  351.     int rc;
  352.  
  353.     switch (IPC_GET_METHOD(call->data)) {
  354.     case IPC_M_CONNECTION_CLONE: {
  355.         phone_t *cloned_phone;
  356.         GET_CHECK_PHONE(cloned_phone, IPC_GET_ARG1(call->data),
  357.             return ENOENT);
  358.         if (cloned_phone < phone) {
  359.             mutex_lock(&cloned_phone->lock);
  360.             mutex_lock(&phone->lock);
  361.         } else {
  362.             mutex_lock(&phone->lock);
  363.             mutex_lock(&cloned_phone->lock);
  364.         }
  365.         if ((cloned_phone->state != IPC_PHONE_CONNECTED) ||
  366.             phone->state != IPC_PHONE_CONNECTED) {
  367.             mutex_unlock(&cloned_phone->lock);
  368.             mutex_unlock(&phone->lock);
  369.             return EINVAL;
  370.         }
  371.         /*
  372.          * We can be pretty sure now that both tasks exist and we are
  373.          * connected to them. As we continue to hold the phone locks,
  374.          * we are effectively preventing them from finishing their
  375.          * potential cleanup.
  376.          */
  377.         newphid = phone_alloc(phone->callee->task);
  378.         if (newphid < 0) {
  379.             mutex_unlock(&cloned_phone->lock);
  380.             mutex_unlock(&phone->lock);
  381.             return ELIMIT;
  382.         }
  383.         ipc_phone_connect(&phone->callee->task->phones[newphid],
  384.             cloned_phone->callee);
  385.         mutex_unlock(&cloned_phone->lock);
  386.         mutex_unlock(&phone->lock);
  387.         /* Set the new phone for the callee. */
  388.         IPC_SET_ARG1(call->data, newphid);
  389.         break;
  390.     }
  391.     case IPC_M_CONNECT_ME:
  392.         IPC_SET_ARG5(call->data, (unative_t) phone);
  393.         break;
  394.     case IPC_M_CONNECT_ME_TO:
  395.         newphid = phone_alloc(TASK);
  396.         if (newphid < 0)
  397.             return ELIMIT;
  398.         /* Set arg5 for server */
  399.         IPC_SET_ARG5(call->data, (unative_t) &TASK->phones[newphid]);
  400.         call->flags |= IPC_CALL_CONN_ME_TO;
  401.         call->priv = newphid;
  402.         break;
  403.     case IPC_M_SHARE_OUT:
  404.         size = as_area_get_size(IPC_GET_ARG1(call->data));
  405.         if (!size)
  406.             return EPERM;
  407.         IPC_SET_ARG2(call->data, size);
  408.         break;
  409.     case IPC_M_DATA_READ:
  410.         size = IPC_GET_ARG2(call->data);
  411.         if ((size <= 0 || (size > DATA_XFER_LIMIT)))
  412.             return ELIMIT;
  413.         break;
  414.     case IPC_M_DATA_WRITE:
  415.         src = IPC_GET_ARG1(call->data);
  416.         size = IPC_GET_ARG2(call->data);
  417.        
  418.         if (size > DATA_XFER_LIMIT)
  419.             return ELIMIT;
  420.        
  421.         call->buffer = (uint8_t *) malloc(size, 0);
  422.         rc = copy_from_uspace(call->buffer, (void *) src, size);
  423.         if (rc != 0) {
  424.             free(call->buffer);
  425.             return rc;
  426.         }
  427.         break;
  428. #ifdef CONFIG_UDEBUG
  429.     case IPC_M_DEBUG_ALL:
  430.         return udebug_request_preprocess(call, phone);
  431. #endif
  432.     default:
  433.         break;
  434.     }
  435.     return 0;
  436. }
  437.  
  438. /*******************************************************************************
  439.  * Functions called to process received call/answer before passing it to uspace.
  440.  *******************************************************************************/
  441.  
  442. /** Do basic kernel processing of received call answer.
  443.  *
  444.  * @param call      Call structure with the answer.
  445.  */
  446. static void process_answer(call_t *call)
  447. {
  448.     if (((native_t) IPC_GET_RETVAL(call->data) == EHANGUP) &&
  449.         (call->flags & IPC_CALL_FORWARDED))
  450.         IPC_SET_RETVAL(call->data, EFORWARD);
  451.  
  452.     if (call->flags & IPC_CALL_CONN_ME_TO) {
  453.         if (IPC_GET_RETVAL(call->data))
  454.             phone_dealloc(call->priv);
  455.         else
  456.             IPC_SET_ARG5(call->data, call->priv);
  457.     }
  458.  
  459.     if (call->buffer) {
  460.         /* This must be an affirmative answer to IPC_M_DATA_READ. */
  461.         /* or IPC_M_DEBUG_ALL/UDEBUG_M_MEM_READ... */
  462.         uintptr_t dst = IPC_GET_ARG1(call->data);
  463.         size_t size = IPC_GET_ARG2(call->data);
  464.         int rc = copy_to_uspace((void *) dst, call->buffer, size);
  465.         if (rc)
  466.             IPC_SET_RETVAL(call->data, rc);
  467.         free(call->buffer);
  468.         call->buffer = NULL;
  469.     }
  470. }
  471.  
  472. /** Do basic kernel processing of received call request.
  473.  *
  474.  * @param box       Destination answerbox structure.
  475.  * @param call      Call structure with the request.
  476.  *
  477.  * @return      Return 0 if the call should be passed to userspace.
  478.  *          Return -1 if the call should be ignored.
  479.  */
  480. static int process_request(answerbox_t *box, call_t *call)
  481. {
  482.     int phoneid;
  483.  
  484.     if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
  485.         phoneid = phone_alloc(TASK);
  486.         if (phoneid < 0) { /* Failed to allocate phone */
  487.             IPC_SET_RETVAL(call->data, ELIMIT);
  488.             ipc_answer(box, call);
  489.             return -1;
  490.         }
  491.         IPC_SET_ARG5(call->data, phoneid);
  492.     }
  493.     switch (IPC_GET_METHOD(call->data)) {
  494.     case IPC_M_DEBUG_ALL:
  495.         return -1;
  496.     default:
  497.         break;
  498.     }
  499.     return 0;
  500. }
  501.  
  502. /** Make a fast call over IPC, wait for reply and return to user.
  503.  *
  504.  * This function can handle only three arguments of payload, but is faster than
  505.  * the generic function (i.e. sys_ipc_call_sync_slow()).
  506.  *
  507.  * @param phoneid   Phone handle for the call.
  508.  * @param method    Method of the call.
  509.  * @param arg1      Service-defined payload argument.
  510.  * @param arg2      Service-defined payload argument.
  511.  * @param arg3      Service-defined payload argument.
  512.  * @param data      Address of userspace structure where the reply call will
  513.  *          be stored.
  514.  *
  515.  * @return      Returns 0 on success.
  516.  *          Return ENOENT if there is no such phone handle.
  517.  */
  518. unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
  519.     unative_t arg1, unative_t arg2, unative_t arg3, ipc_data_t *data)
  520. {
  521.     call_t call;
  522.     phone_t *phone;
  523.     int res;
  524.     int rc;
  525.    
  526.     GET_CHECK_PHONE(phone, phoneid, return ENOENT);
  527.  
  528.     ipc_call_static_init(&call);
  529.     IPC_SET_METHOD(call.data, method);
  530.     IPC_SET_ARG1(call.data, arg1);
  531.     IPC_SET_ARG2(call.data, arg2);
  532.     IPC_SET_ARG3(call.data, arg3);
  533.     /*
  534.      * To achieve deterministic behavior, zero out arguments that are beyond
  535.      * the limits of the fast version.
  536.      */
  537.     IPC_SET_ARG4(call.data, 0);
  538.     IPC_SET_ARG5(call.data, 0);
  539.  
  540.     if (!(res = request_preprocess(&call, phone))) {
  541. #ifdef CONFIG_UDEBUG
  542.         udebug_stoppable_begin();
  543. #endif
  544.         rc = ipc_call_sync(phone, &call);
  545. #ifdef CONFIG_UDEBUG
  546.         udebug_stoppable_end();
  547. #endif
  548.         if (rc != EOK)
  549.             return rc;
  550.         process_answer(&call);
  551.  
  552.     } else {
  553.         IPC_SET_RETVAL(call.data, res);
  554.     }
  555.     rc = STRUCT_TO_USPACE(&data->args, &call.data.args);
  556.     if (rc != 0)
  557.         return rc;
  558.  
  559.     return 0;
  560. }
  561.  
  562. /** Make a synchronous IPC call allowing to transmit the entire payload.
  563.  *
  564.  * @param phoneid   Phone handle for the call.
  565.  * @param question  Userspace address of call data with the request.
  566.  * @param reply     Userspace address of call data where to store the
  567.  *          answer.
  568.  *
  569.  * @return      Zero on success or an error code.
  570.  */
  571. unative_t sys_ipc_call_sync_slow(unative_t phoneid, ipc_data_t *question,
  572.     ipc_data_t *reply)
  573. {
  574.     call_t call;
  575.     phone_t *phone;
  576.     int res;
  577.     int rc;
  578.  
  579.     ipc_call_static_init(&call);
  580.     rc = copy_from_uspace(&call.data.args, &question->args,
  581.         sizeof(call.data.args));
  582.     if (rc != 0)
  583.         return (unative_t) rc;
  584.  
  585.     GET_CHECK_PHONE(phone, phoneid, return ENOENT);
  586.  
  587.     if (!(res = request_preprocess(&call, phone))) {
  588. #ifdef CONFIG_UDEBUG
  589.         udebug_stoppable_begin();
  590. #endif
  591.         rc = ipc_call_sync(phone, &call);
  592. #ifdef CONFIG_UDEBUG
  593.         udebug_stoppable_end();
  594. #endif
  595.         if (rc != EOK)
  596.             return rc;
  597.         process_answer(&call);
  598.     } else
  599.         IPC_SET_RETVAL(call.data, res);
  600.  
  601.     rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
  602.     if (rc != 0)
  603.         return rc;
  604.  
  605.     return 0;
  606. }
  607.  
  608. /** Check that the task did not exceed the allowed limit of asynchronous calls.
  609.  *
  610.  * @return      Return 0 if limit not reached or -1 if limit exceeded.
  611.  */
  612. static int check_call_limit(void)
  613. {
  614.     if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
  615.         atomic_dec(&TASK->active_calls);
  616.         return -1;
  617.     }
  618.     return 0;
  619. }
  620.  
  621. /** Make a fast asynchronous call over IPC.
  622.  *
  623.  * This function can only handle four arguments of payload, but is faster than
  624.  * the generic function sys_ipc_call_async_slow().
  625.  *
  626.  * @param phoneid   Phone handle for the call.
  627.  * @param method    Method of the call.
  628.  * @param arg1      Service-defined payload argument.
  629.  * @param arg2      Service-defined payload argument.
  630.  * @param arg3      Service-defined payload argument.
  631.  * @param arg4      Service-defined payload argument.
  632.  *
  633.  * @return      Return call hash on success.
  634.  *          Return IPC_CALLRET_FATAL in case of a fatal error and
  635.  *          IPC_CALLRET_TEMPORARY if there are too many pending
  636.  *          asynchronous requests; answers should be handled first.
  637.  */
  638. unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
  639.     unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
  640. {
  641.     call_t *call;
  642.     phone_t *phone;
  643.     int res;
  644.  
  645.     if (check_call_limit())
  646.         return IPC_CALLRET_TEMPORARY;
  647.  
  648.     GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
  649.  
  650.     call = ipc_call_alloc(0);
  651.     IPC_SET_METHOD(call->data, method);
  652.     IPC_SET_ARG1(call->data, arg1);
  653.     IPC_SET_ARG2(call->data, arg2);
  654.     IPC_SET_ARG3(call->data, arg3);
  655.     IPC_SET_ARG4(call->data, arg4);
  656.     /*
  657.      * To achieve deterministic behavior, zero out arguments that are beyond
  658.      * the limits of the fast version.
  659.      */
  660.     IPC_SET_ARG5(call->data, 0);
  661.  
  662.     if (!(res = request_preprocess(call, phone)))
  663.         ipc_call(phone, call);
  664.     else
  665.         ipc_backsend_err(phone, call, res);
  666.  
  667.     return (unative_t) call;
  668. }
  669.  
  670. /** Make an asynchronous IPC call allowing to transmit the entire payload.
  671.  *
  672.  * @param phoneid   Phone handle for the call.
  673.  * @param data      Userspace address of call data with the request.
  674.  *
  675.  * @return      See sys_ipc_call_async_fast().
  676.  */
  677. unative_t sys_ipc_call_async_slow(unative_t phoneid, ipc_data_t *data)
  678. {
  679.     call_t *call;
  680.     phone_t *phone;
  681.     int res;
  682.     int rc;
  683.  
  684.     if (check_call_limit())
  685.         return IPC_CALLRET_TEMPORARY;
  686.  
  687.     GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
  688.  
  689.     call = ipc_call_alloc(0);
  690.     rc = copy_from_uspace(&call->data.args, &data->args,
  691.         sizeof(call->data.args));
  692.     if (rc != 0) {
  693.         ipc_call_free(call);
  694.         return (unative_t) rc;
  695.     }
  696.     if (!(res = request_preprocess(call, phone)))
  697.         ipc_call(phone, call);
  698.     else
  699.         ipc_backsend_err(phone, call, res);
  700.  
  701.     return (unative_t) call;
  702. }
  703.  
  704. /** Forward a received call to another destination - common code for both the
  705.  * fast and the slow version.
  706.  *
  707.  * @param callid    Hash of the call to forward.
  708.  * @param phoneid   Phone handle to use for forwarding.
  709.  * @param method    New method to use for the forwarded call.
  710.  * @param arg1      New value of the first argument for the forwarded call.
  711.  * @param arg2      New value of the second argument for the forwarded call.
  712.  * @param arg3      New value of the third argument for the forwarded call.
  713.  * @param arg4      New value of the fourth argument for the forwarded call.
  714.  * @param arg5      New value of the fifth argument for the forwarded call.
  715.  * @param mode      Flags that specify mode of the forward operation.
  716.  * @param slow      If true, arg3, arg4 and arg5 are considered. Otherwise
  717.  *          the function considers only the fast version arguments:
  718.  *          i.e. arg1 and arg2.
  719.  *
  720.  * @return      Return 0 on succes, otherwise return an error code.
  721.  *
  722.  * Warning: Make sure that ARG5 is not rewritten for certain system IPC
  723.  */
  724. static unative_t sys_ipc_forward_common(unative_t callid, unative_t phoneid,
  725.     unative_t method, unative_t arg1, unative_t arg2, unative_t arg3,
  726.     unative_t arg4, unative_t arg5, int mode, bool slow)
  727. {
  728.     call_t *call;
  729.     phone_t *phone;
  730.  
  731.     call = get_call(callid);
  732.     if (!call)
  733.         return ENOENT;
  734.    
  735.     call->flags |= IPC_CALL_FORWARDED;
  736.  
  737.     GET_CHECK_PHONE(phone, phoneid, {
  738.         IPC_SET_RETVAL(call->data, EFORWARD);
  739.         ipc_answer(&TASK->answerbox, call);
  740.         return ENOENT;
  741.     });
  742.  
  743.     if (!method_is_forwardable(IPC_GET_METHOD(call->data))) {
  744.         IPC_SET_RETVAL(call->data, EFORWARD);
  745.         ipc_answer(&TASK->answerbox, call);
  746.         return EPERM;
  747.     }
  748.  
  749.     /*
  750.      * Userspace is not allowed to change method of system methods on
  751.      * forward, allow changing ARG1, ARG2, ARG3 and ARG4 by means of method,
  752.      * arg1, arg2 and arg3.
  753.      * If the method is immutable, don't change anything.
  754.      */
  755.     if (!method_is_immutable(IPC_GET_METHOD(call->data))) {
  756.         if (method_is_system(IPC_GET_METHOD(call->data))) {
  757.             if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
  758.                 phone_dealloc(IPC_GET_ARG5(call->data));
  759.  
  760.             IPC_SET_ARG1(call->data, method);
  761.             IPC_SET_ARG2(call->data, arg1);
  762.             IPC_SET_ARG3(call->data, arg2);
  763.             if (slow) {
  764.                 IPC_SET_ARG4(call->data, arg3);
  765.                 /*
  766.                  * For system methods we deliberately don't
  767.                  * overwrite ARG5.
  768.                  */
  769.             }
  770.         } else {
  771.             IPC_SET_METHOD(call->data, method);
  772.             IPC_SET_ARG1(call->data, arg1);
  773.             IPC_SET_ARG2(call->data, arg2);
  774.             if (slow) {
  775.                 IPC_SET_ARG3(call->data, arg3);
  776.                 IPC_SET_ARG4(call->data, arg4);
  777.                 IPC_SET_ARG5(call->data, arg5);
  778.             }
  779.         }
  780.     }
  781.  
  782.     return ipc_forward(call, phone, &TASK->answerbox, mode);
  783. }
  784.  
  785. /** Forward a received call to another destination - fast version.
  786.  *
  787.  * @param callid    Hash of the call to forward.
  788.  * @param phoneid   Phone handle to use for forwarding.
  789.  * @param method    New method to use for the forwarded call.
  790.  * @param arg1      New value of the first argument for the forwarded call.
  791.  * @param arg2      New value of the second argument for the forwarded call.
  792.  * @param mode      Flags that specify mode of the forward operation.
  793.  *
  794.  * @return      Return 0 on succes, otherwise return an error code.
  795.  *
  796.  * In case the original method is a system method, ARG1, ARG2 and ARG3 are
  797.  * overwritten in the forwarded message with the new method and the new
  798.  * arg1 and arg2, respectively. Otherwise the METHOD, ARG1 and ARG2 are
  799.  * rewritten with the new method, arg1 and arg2, respectively. Also note there
  800.  * is a set of immutable methods, for which the new method and arguments are not
  801.  * set and these values are ignored.
  802.  */
  803. unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
  804.     unative_t method, unative_t arg1, unative_t arg2, int mode)
  805. {
  806.     return sys_ipc_forward_common(callid, phoneid, method, arg1, arg2, 0, 0,
  807.         0, mode, false);
  808. }
  809.  
  810. /** Forward a received call to another destination - slow version.
  811.  *
  812.  * @param callid    Hash of the call to forward.
  813.  * @param phoneid   Phone handle to use for forwarding.
  814.  * @param data      Userspace address of the new IPC data.
  815.  * @param mode      Flags that specify mode of the forward operation.
  816.  *
  817.  * @return      Return 0 on succes, otherwise return an error code.
  818.  *
  819.  * This function is the slow verision of the sys_ipc_forward_fast interface.
  820.  * It can copy all five new arguments and the new method from the userspace.
  821.  * It naturally extends the functionality of the fast version. For system
  822.  * methods, it additionally stores the new value of arg3 to ARG4. For non-system
  823.  * methods, it additionally stores the new value of arg3, arg4 and arg5,
  824.  * respectively, to ARG3, ARG4 and ARG5, respectively.
  825.  */
  826. unative_t sys_ipc_forward_slow(unative_t callid, unative_t phoneid,
  827.     ipc_data_t *data, int mode)
  828. {
  829.     ipc_data_t newdata;
  830.     int rc;
  831.  
  832.     rc = copy_from_uspace(&newdata.args, &data->args,
  833.         sizeof(newdata.args));
  834.     if (rc != 0)
  835.         return (unative_t) rc;
  836.  
  837.     return sys_ipc_forward_common(callid, phoneid,
  838.         IPC_GET_METHOD(newdata), IPC_GET_ARG1(newdata),
  839.         IPC_GET_ARG2(newdata), IPC_GET_ARG3(newdata),
  840.         IPC_GET_ARG4(newdata), IPC_GET_ARG5(newdata), mode, true);
  841. }
  842.  
  843. /** Answer an IPC call - fast version.
  844.  *
  845.  * This function can handle only two return arguments of payload, but is faster
  846.  * than the generic sys_ipc_answer().
  847.  *
  848.  * @param callid    Hash of the call to be answered.
  849.  * @param retval    Return value of the answer.
  850.  * @param arg1      Service-defined return value.
  851.  * @param arg2      Service-defined return value.
  852.  * @param arg3      Service-defined return value.
  853.  * @param arg4      Service-defined return value.
  854.  *
  855.  * @return      Return 0 on success, otherwise return an error code.   
  856.  */
  857. unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
  858.     unative_t arg1, unative_t arg2, unative_t arg3, unative_t arg4)
  859. {
  860.     call_t *call;
  861.     ipc_data_t saved_data;
  862.     int saveddata = 0;
  863.     int rc;
  864.  
  865.     /* Do not answer notification callids */
  866.     if (callid & IPC_CALLID_NOTIFICATION)
  867.         return 0;
  868.  
  869.     call = get_call(callid);
  870.     if (!call)
  871.         return ENOENT;
  872.  
  873.     if (answer_need_old(call)) {
  874.         memcpy(&saved_data, &call->data, sizeof(call->data));
  875.         saveddata = 1;
  876.     }
  877.  
  878.     IPC_SET_RETVAL(call->data, retval);
  879.     IPC_SET_ARG1(call->data, arg1);
  880.     IPC_SET_ARG2(call->data, arg2);
  881.     IPC_SET_ARG3(call->data, arg3);
  882.     IPC_SET_ARG4(call->data, arg4);
  883.     /*
  884.      * To achieve deterministic behavior, zero out arguments that are beyond
  885.      * the limits of the fast version.
  886.      */
  887.     IPC_SET_ARG5(call->data, 0);
  888.     rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
  889.  
  890.     ipc_answer(&TASK->answerbox, call);
  891.     return rc;
  892. }
  893.  
  894. /** Answer an IPC call.
  895.  *
  896.  * @param callid    Hash of the call to be answered.
  897.  * @param data      Userspace address of call data with the answer.
  898.  *
  899.  * @return      Return 0 on success, otherwise return an error code.
  900.  */
  901. unative_t sys_ipc_answer_slow(unative_t callid, ipc_data_t *data)
  902. {
  903.     call_t *call;
  904.     ipc_data_t saved_data;
  905.     int saveddata = 0;
  906.     int rc;
  907.  
  908.     /* Do not answer notification callids */
  909.     if (callid & IPC_CALLID_NOTIFICATION)
  910.         return 0;
  911.  
  912.     call = get_call(callid);
  913.     if (!call)
  914.         return ENOENT;
  915.  
  916.     if (answer_need_old(call)) {
  917.         memcpy(&saved_data, &call->data, sizeof(call->data));
  918.         saveddata = 1;
  919.     }
  920.     rc = copy_from_uspace(&call->data.args, &data->args,
  921.         sizeof(call->data.args));
  922.     if (rc != 0)
  923.         return rc;
  924.  
  925.     rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
  926.    
  927.     ipc_answer(&TASK->answerbox, call);
  928.  
  929.     return rc;
  930. }
  931.  
  932. /** Hang up a phone.
  933.  *
  934.  * @param       Phone handle of the phone to be hung up.
  935.  *
  936.  * @return      Return 0 on success or an error code.
  937.  */
  938. unative_t sys_ipc_hangup(int phoneid)
  939. {
  940.     phone_t *phone;
  941.  
  942.     GET_CHECK_PHONE(phone, phoneid, return ENOENT);
  943.  
  944.     if (ipc_phone_hangup(phone))
  945.         return -1;
  946.  
  947.     return 0;
  948. }
  949.  
  950. /** Wait for an incoming IPC call or an answer.
  951.  *
  952.  * @param calldata  Pointer to buffer where the call/answer data is stored.
  953.  * @param usec      Timeout. See waitq_sleep_timeout() for explanation.
  954.  * @param flags     Select mode of sleep operation. See waitq_sleep_timeout()
  955.  *          for explanation.
  956.  *
  957.  * @return      Hash of the call.
  958.  *          If IPC_CALLID_NOTIFICATION bit is set in the hash, the
  959.  *          call is a notification. IPC_CALLID_ANSWERED denotes an
  960.  *          answer.
  961.  */
  962. unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
  963. {
  964.     call_t *call;
  965.  
  966. restart:
  967.  
  968. #ifdef CONFIG_UDEBUG
  969.     udebug_stoppable_begin();
  970. #endif 
  971.     call = ipc_wait_for_call(&TASK->answerbox, usec,
  972.         flags | SYNCH_FLAGS_INTERRUPTIBLE);
  973.  
  974. #ifdef CONFIG_UDEBUG
  975.     udebug_stoppable_end();
  976. #endif
  977.     if (!call)
  978.         return 0;
  979.  
  980.     if (call->flags & IPC_CALL_NOTIF) {
  981.         ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
  982.  
  983.         /* Set in_phone_hash to the interrupt counter */
  984.         call->data.phone = (void *) call->priv;
  985.        
  986.         STRUCT_TO_USPACE(calldata, &call->data);
  987.  
  988.         ipc_call_free(call);
  989.        
  990.         return ((unative_t) call) | IPC_CALLID_NOTIFICATION;
  991.     }
  992.  
  993.     if (call->flags & IPC_CALL_ANSWERED) {
  994.         process_answer(call);
  995.  
  996.         ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
  997.  
  998.         if (call->flags & IPC_CALL_DISCARD_ANSWER) {
  999.             ipc_call_free(call);
  1000.             goto restart;
  1001.         } else {
  1002.             /*
  1003.              * Decrement the counter of active calls only if the
  1004.              * call is not an answer to IPC_M_PHONE_HUNGUP,
  1005.              * which doesn't contribute to the counter.
  1006.              */
  1007.             atomic_dec(&TASK->active_calls);
  1008.         }
  1009.  
  1010.         STRUCT_TO_USPACE(&calldata->args, &call->data.args);
  1011.         ipc_call_free(call);
  1012.  
  1013.         return ((unative_t) call) | IPC_CALLID_ANSWERED;
  1014.     }
  1015.  
  1016.     if (process_request(&TASK->answerbox, call))
  1017.         goto restart;
  1018.  
  1019.     /* Include phone address('id') of the caller in the request,
  1020.      * copy whole call->data, not only call->data.args */
  1021.     if (STRUCT_TO_USPACE(calldata, &call->data)) {
  1022.         /*
  1023.          * The callee will not receive this call and no one else has
  1024.          * a chance to answer it. Reply with the EPARTY error code.
  1025.          */
  1026.         ipc_data_t saved_data;
  1027.         int saveddata = 0;
  1028.  
  1029.         if (answer_need_old(call)) {
  1030.             memcpy(&saved_data, &call->data, sizeof(call->data));
  1031.             saveddata = 1;
  1032.         }
  1033.        
  1034.         IPC_SET_RETVAL(call->data, EPARTY);
  1035.         (void) answer_preprocess(call, saveddata ? &saved_data : NULL);
  1036.         ipc_answer(&TASK->answerbox, call);
  1037.         return 0;
  1038.     }
  1039.     return (unative_t)call;
  1040. }
  1041.  
  1042. /** Connect an IRQ handler to a task.
  1043.  *
  1044.  * @param inr       IRQ number.
  1045.  * @param devno     Device number.
  1046.  * @param method    Method to be associated with the notification.
  1047.  * @param ucode     Uspace pointer to the top-half pseudocode.
  1048.  *
  1049.  * @return      EPERM or a return code returned by ipc_irq_register().
  1050.  */
  1051. unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
  1052.     irq_code_t *ucode)
  1053. {
  1054.     if (!(cap_get(TASK) & CAP_IRQ_REG))
  1055.         return EPERM;
  1056.  
  1057.     return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
  1058. }
  1059.  
  1060. /** Disconnect an IRQ handler from a task.
  1061.  *
  1062.  * @param inr       IRQ number.
  1063.  * @param devno     Device number.
  1064.  *
  1065.  * @return      Zero on success or EPERM on error..
  1066.  */
  1067. unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
  1068. {
  1069.     if (!(cap_get(TASK) & CAP_IRQ_REG))
  1070.         return EPERM;
  1071.  
  1072.     ipc_irq_unregister(&TASK->answerbox, inr, devno);
  1073.  
  1074.     return 0;
  1075. }
  1076.  
  1077. #include <console/console.h>
  1078.  
  1079. /**
  1080.  * Syscall connect to a task by id.
  1081.  *
  1082.  * @return      Phone id on success, or negative error code.
  1083.  */
  1084. unative_t sys_ipc_connect_kbox(sysarg64_t *uspace_taskid_arg)
  1085. {
  1086. #ifdef CONFIG_UDEBUG
  1087.     sysarg64_t taskid_arg;
  1088.     int rc;
  1089.    
  1090.     rc = copy_from_uspace(&taskid_arg, uspace_taskid_arg, sizeof(sysarg64_t));
  1091.     if (rc != 0)
  1092.         return (unative_t) rc;
  1093.  
  1094.     LOG("sys_ipc_connect_kbox(%" PRIu64 ")\n", taskid_arg.value);
  1095.  
  1096.     return ipc_connect_kbox(taskid_arg.value);
  1097. #else
  1098.     return (unative_t) ENOTSUP;
  1099. #endif
  1100. }
  1101.  
  1102. /** @}
  1103.  */
  1104.