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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 <arch/interrupt.h>
  46. #include <print.h>
  47. #include <syscall/copy.h>
  48. #include <security/cap.h>
  49. #include <mm/as.h>
  50. #include <print.h>
  51.  
  52. #define GET_CHECK_PHONE(phone, phoneid, err) { \
  53.       if (phoneid > IPC_MAX_PHONES) { err; } \
  54.       phone = &TASK->phones[phoneid]; \
  55. }
  56.  
  57. #define STRUCT_TO_USPACE(dst, src) copy_to_uspace(dst, src, sizeof(*(src)))
  58.  
  59. /** Return true if the method is a system method */
  60. static inline int is_system_method(unative_t method)
  61. {
  62.     if (method <= IPC_M_LAST_SYSTEM)
  63.         return 1;
  64.     return 0;
  65. }
  66.  
  67. /** Return true if the message with this method is forwardable
  68.  *
  69.  * - some system messages may be forwarded, for some of them
  70.  *   it is useless
  71.  */
  72. static inline int is_forwardable(unative_t method)
  73. {
  74.     if (method == IPC_M_PHONE_HUNGUP || method == IPC_M_AS_AREA_SEND ||
  75.         method == IPC_M_AS_AREA_RECV)
  76.         return 0; /* This message is meant only for the receiver */
  77.     return 1;
  78. }
  79.  
  80. /****************************************************/
  81. /* Functions that preprocess answer before sending
  82.  * it to the recepient
  83.  */
  84.  
  85. /** Return true if the caller (ipc_answer) should save
  86.  * the old call contents for answer_preprocess
  87.  */
  88. static inline int answer_need_old(call_t *call)
  89. {
  90.     if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
  91.         return 1;
  92.     if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_ME_TO)
  93.         return 1;
  94.     if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_SEND)
  95.         return 1;
  96.     if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_RECV)
  97.         return 1;
  98.     return 0;
  99. }
  100.  
  101. /** Interpret process answer as control information
  102.  *
  103.  * This function is called directly after sys_ipc_answer
  104.  */
  105. static inline int answer_preprocess(call_t *answer, ipc_data_t *olddata)
  106. {
  107.     int phoneid;
  108.  
  109.     if (IPC_GET_RETVAL(answer->data) == EHANGUP) {
  110.         /* In case of forward, hangup the forwared phone,
  111.          * not the originator
  112.          */
  113.         spinlock_lock(&answer->data.phone->lock);
  114.         spinlock_lock(&TASK->answerbox.lock);
  115.         if (answer->data.phone->state == IPC_PHONE_CONNECTED) {
  116.             list_remove(&answer->data.phone->link);
  117.             answer->data.phone->state = IPC_PHONE_SLAMMED;
  118.         }
  119.         spinlock_unlock(&TASK->answerbox.lock);
  120.         spinlock_unlock(&answer->data.phone->lock);
  121.     }
  122.  
  123.     if (!olddata)
  124.         return 0;
  125.  
  126.     if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
  127.         phoneid = IPC_GET_ARG3(*olddata);
  128.         if (IPC_GET_RETVAL(answer->data)) {
  129.             /* The connection was not accepted */
  130.             phone_dealloc(phoneid);
  131.         } else {
  132.             /* The connection was accepted */
  133.             phone_connect(phoneid, &answer->sender->answerbox);
  134.             /* Set 'phone identification' as arg3 of response */
  135.             IPC_SET_ARG3(answer->data,
  136.                 (unative_t) &TASK->phones[phoneid]);
  137.         }
  138.     } else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
  139.         /* If the users accepted call, connect */
  140.         if (!IPC_GET_RETVAL(answer->data)) {
  141.             ipc_phone_connect((phone_t *) IPC_GET_ARG3(*olddata),
  142.                 &TASK->answerbox);
  143.         }
  144.     } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {
  145.         if (!IPC_GET_RETVAL(answer->data)) {
  146.             /* Accepted, handle as_area receipt */
  147.             ipl_t ipl;
  148.             int rc;
  149.             as_t *as;
  150.            
  151.             ipl = interrupts_disable();
  152.             spinlock_lock(&answer->sender->lock);
  153.             as = answer->sender->as;
  154.             spinlock_unlock(&answer->sender->lock);
  155.             interrupts_restore(ipl);
  156.            
  157.             rc = as_area_share(as, IPC_GET_ARG1(*olddata),
  158.                 IPC_GET_ARG2(*olddata), AS,
  159.                 IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));
  160.             IPC_SET_RETVAL(answer->data, rc);
  161.             return rc;
  162.         }
  163.     } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_RECV) {
  164.         if (!IPC_GET_RETVAL(answer->data)) {
  165.             ipl_t ipl;
  166.             as_t *as;
  167.             int rc;
  168.            
  169.             ipl = interrupts_disable();
  170.             spinlock_lock(&answer->sender->lock);
  171.             as = answer->sender->as;
  172.             spinlock_unlock(&answer->sender->lock);
  173.             interrupts_restore(ipl);
  174.            
  175.             rc = as_area_share(AS, IPC_GET_ARG1(answer->data),
  176.                 IPC_GET_ARG2(*olddata), as, IPC_GET_ARG1(*olddata),
  177.                 IPC_GET_ARG2(answer->data));
  178.             IPC_SET_RETVAL(answer->data, rc);
  179.         }
  180.     }
  181.     return 0;
  182. }
  183.  
  184. /** Called before the request is sent
  185.  *
  186.  * @return 0 - no error, -1 - report error to user
  187.  */
  188. static int request_preprocess(call_t *call)
  189. {
  190.     int newphid;
  191.     size_t size;
  192.  
  193.     switch (IPC_GET_METHOD(call->data)) {
  194.     case IPC_M_CONNECT_ME_TO:
  195.         newphid = phone_alloc();
  196.         if (newphid < 0)
  197.             return ELIMIT;
  198.         /* Set arg3 for server */
  199.         IPC_SET_ARG3(call->data, (unative_t) &TASK->phones[newphid]);
  200.         call->flags |= IPC_CALL_CONN_ME_TO;
  201.         call->priv = newphid;
  202.         break;
  203.     case IPC_M_AS_AREA_SEND:
  204.         size = as_get_size(IPC_GET_ARG1(call->data));
  205.         if (!size) {
  206.             return EPERM;
  207.         }
  208.         IPC_SET_ARG2(call->data, size);
  209.         break;
  210.     default:
  211.         break;
  212.     }
  213.     return 0;
  214. }
  215.  
  216. /****************************************************/
  217. /* Functions called to process received call/answer
  218.  * before passing to uspace
  219.  */
  220.  
  221. /** Do basic kernel processing of received call answer */
  222. static void process_answer(call_t *call)
  223. {
  224.     if (IPC_GET_RETVAL(call->data) == EHANGUP &&
  225.         (call->flags & IPC_CALL_FORWARDED))
  226.         IPC_SET_RETVAL(call->data, EFORWARD);
  227.  
  228.     if (call->flags & IPC_CALL_CONN_ME_TO) {
  229.         if (IPC_GET_RETVAL(call->data))
  230.             phone_dealloc(call->priv);
  231.         else
  232.             IPC_SET_ARG3(call->data, call->priv);
  233.     }
  234. }
  235.  
  236. /** Do basic kernel processing of received call request
  237.  *
  238.  * @return 0 - the call should be passed to userspace, 1 - ignore call
  239.  */
  240. static int process_request(answerbox_t *box, call_t *call)
  241. {
  242.     int phoneid;
  243.  
  244.     if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
  245.         phoneid = phone_alloc();
  246.         if (phoneid < 0) { /* Failed to allocate phone */
  247.             IPC_SET_RETVAL(call->data, ELIMIT);
  248.             ipc_answer(box,call);
  249.             return -1;
  250.         }
  251.         IPC_SET_ARG3(call->data, phoneid);
  252.     }
  253.     return 0;
  254. }
  255.  
  256. /** Send a call over IPC, wait for reply, return to user
  257.  *
  258.  * @return Call identification, returns -1 on fatal error,
  259.            -2 on 'Too many async request, handle answers first
  260.  */
  261. unative_t sys_ipc_call_sync_fast(unative_t phoneid, unative_t method,
  262.     unative_t arg1, ipc_data_t *data)
  263. {
  264.     call_t call;
  265.     phone_t *phone;
  266.     int res;
  267.  
  268.     GET_CHECK_PHONE(phone, phoneid, return ENOENT);
  269.  
  270.     ipc_call_static_init(&call);
  271.     IPC_SET_METHOD(call.data, method);
  272.     IPC_SET_ARG1(call.data, arg1);
  273.  
  274.     if (!(res=request_preprocess(&call))) {
  275.         ipc_call_sync(phone, &call);
  276.         process_answer(&call);
  277.     } else
  278.         IPC_SET_RETVAL(call.data, res);
  279.     STRUCT_TO_USPACE(&data->args, &call.data.args);
  280.  
  281.     return 0;
  282. }
  283.  
  284. /** Synchronous IPC call allowing to send whole message */
  285. unative_t sys_ipc_call_sync(unative_t phoneid, ipc_data_t *question,
  286.     ipc_data_t *reply)
  287. {
  288.     call_t call;
  289.     phone_t *phone;
  290.     int res;
  291.     int rc;
  292.  
  293.     ipc_call_static_init(&call);
  294.     rc = copy_from_uspace(&call.data.args, &question->args,
  295.         sizeof(call.data.args));
  296.     if (rc != 0)
  297.         return (unative_t) rc;
  298.  
  299.     GET_CHECK_PHONE(phone, phoneid, return ENOENT);
  300.  
  301.     if (!(res=request_preprocess(&call))) {
  302.         ipc_call_sync(phone, &call);
  303.         process_answer(&call);
  304.     } else
  305.         IPC_SET_RETVAL(call.data, res);
  306.  
  307.     rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
  308.     if (rc != 0)
  309.         return rc;
  310.  
  311.     return 0;
  312. }
  313.  
  314. /** Check that the task did not exceed allowed limit
  315.  *
  316.  * @return 0 - Limit OK,   -1 - limit exceeded
  317.  */
  318. static int check_call_limit(void)
  319. {
  320.     if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
  321.         atomic_dec(&TASK->active_calls);
  322.         return -1;
  323.     }
  324.     return 0;
  325. }
  326.  
  327. /** Send an asynchronous call over ipc
  328.  *
  329.  * @return Call identification, returns -1 on fatal error,
  330.            -2 on 'Too many async request, handle answers first
  331.  */
  332. unative_t sys_ipc_call_async_fast(unative_t phoneid, unative_t method,
  333.     unative_t arg1, unative_t arg2)
  334. {
  335.     call_t *call;
  336.     phone_t *phone;
  337.     int res;
  338.  
  339.     if (check_call_limit())
  340.         return IPC_CALLRET_TEMPORARY;
  341.  
  342.     GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
  343.  
  344.     call = ipc_call_alloc(0);
  345.     IPC_SET_METHOD(call->data, method);
  346.     IPC_SET_ARG1(call->data, arg1);
  347.     IPC_SET_ARG2(call->data, arg2);
  348.     IPC_SET_ARG3(call->data, 0);
  349.  
  350.     if (!(res = request_preprocess(call)))
  351.         ipc_call(phone, call);
  352.     else
  353.         ipc_backsend_err(phone, call, res);
  354.  
  355.     return (unative_t) call;
  356. }
  357.  
  358. /** Synchronous IPC call allowing to send whole message
  359.  *
  360.  * @return The same as sys_ipc_call_async
  361.  */
  362. unative_t sys_ipc_call_async(unative_t phoneid, ipc_data_t *data)
  363. {
  364.     call_t *call;
  365.     phone_t *phone;
  366.     int res;
  367.     int rc;
  368.  
  369.     if (check_call_limit())
  370.         return IPC_CALLRET_TEMPORARY;
  371.  
  372.     GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
  373.  
  374.     call = ipc_call_alloc(0);
  375.     rc = copy_from_uspace(&call->data.args, &data->args,
  376.         sizeof(call->data.args));
  377.     if (rc != 0) {
  378.         ipc_call_free(call);
  379.         return (unative_t) rc;
  380.     }
  381.     if (!(res = request_preprocess(call)))
  382.         ipc_call(phone, call);
  383.     else
  384.         ipc_backsend_err(phone, call, res);
  385.  
  386.     return (unative_t) call;
  387. }
  388.  
  389. /** Forward received call to another destination
  390.  *
  391.  * The arg1 and arg2 are changed in the forwarded message
  392.  *
  393.  * Warning: If implementing non-fast version, make sure that
  394.  *          arg3 is not rewritten for certain system IPC
  395.  */
  396. unative_t sys_ipc_forward_fast(unative_t callid, unative_t phoneid,
  397.     unative_t method, unative_t arg1)
  398. {
  399.     call_t *call;
  400.     phone_t *phone;
  401.  
  402.     call = get_call(callid);
  403.     if (!call)
  404.         return ENOENT;
  405.  
  406.     call->flags |= IPC_CALL_FORWARDED;
  407.  
  408.     GET_CHECK_PHONE(phone, phoneid, {
  409.         IPC_SET_RETVAL(call->data, EFORWARD);
  410.         ipc_answer(&TASK->answerbox, call);
  411.         return ENOENT;
  412.     });    
  413.  
  414.     if (!is_forwardable(IPC_GET_METHOD(call->data))) {
  415.         IPC_SET_RETVAL(call->data, EFORWARD);
  416.         ipc_answer(&TASK->answerbox, call);
  417.         return EPERM;
  418.     }
  419.  
  420.     /* Userspace is not allowed to change method of system methods
  421.      * on forward, allow changing ARG1 and ARG2 by means of method and arg1
  422.      */
  423.     if (is_system_method(IPC_GET_METHOD(call->data))) {
  424.         if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
  425.             phone_dealloc(IPC_GET_ARG3(call->data));
  426.  
  427.         IPC_SET_ARG1(call->data, method);
  428.         IPC_SET_ARG2(call->data, arg1);
  429.     } else {
  430.         IPC_SET_METHOD(call->data, method);
  431.         IPC_SET_ARG1(call->data, arg1);
  432.     }
  433.  
  434.     return ipc_forward(call, phone, &TASK->answerbox);
  435. }
  436.  
  437. /** Send IPC answer */
  438. unative_t sys_ipc_answer_fast(unative_t callid, unative_t retval,
  439.     unative_t arg1, unative_t arg2)
  440. {
  441.     call_t *call;
  442.     ipc_data_t saved_data;
  443.     int saveddata = 0;
  444.     int rc;
  445.  
  446.     /* Do not answer notification callids */
  447.     if (callid & IPC_CALLID_NOTIFICATION)
  448.         return 0;
  449.  
  450.     call = get_call(callid);
  451.     if (!call)
  452.         return ENOENT;
  453.  
  454.     if (answer_need_old(call)) {
  455.         memcpy(&saved_data, &call->data, sizeof(call->data));
  456.         saveddata = 1;
  457.     }
  458.  
  459.     IPC_SET_RETVAL(call->data, retval);
  460.     IPC_SET_ARG1(call->data, arg1);
  461.     IPC_SET_ARG2(call->data, arg2);
  462.     rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
  463.  
  464.     ipc_answer(&TASK->answerbox, call);
  465.     return rc;
  466. }
  467.  
  468. /** Send IPC answer */
  469. unative_t sys_ipc_answer(unative_t callid, ipc_data_t *data)
  470. {
  471.     call_t *call;
  472.     ipc_data_t saved_data;
  473.     int saveddata = 0;
  474.     int rc;
  475.  
  476.     /* Do not answer notification callids */
  477.     if (callid & IPC_CALLID_NOTIFICATION)
  478.         return 0;
  479.  
  480.     call = get_call(callid);
  481.     if (!call)
  482.         return ENOENT;
  483.  
  484.     if (answer_need_old(call)) {
  485.         memcpy(&saved_data, &call->data, sizeof(call->data));
  486.         saveddata = 1;
  487.     }
  488.     rc = copy_from_uspace(&call->data.args, &data->args,
  489.         sizeof(call->data.args));
  490.     if (rc != 0)
  491.         return rc;
  492.  
  493.     rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
  494.    
  495.     ipc_answer(&TASK->answerbox, call);
  496.  
  497.     return rc;
  498. }
  499.  
  500. /** Hang up the phone
  501.  *
  502.  */
  503. unative_t sys_ipc_hangup(int phoneid)
  504. {
  505.     phone_t *phone;
  506.  
  507.     GET_CHECK_PHONE(phone, phoneid, return ENOENT);
  508.  
  509.     if (ipc_phone_hangup(phone))
  510.         return -1;
  511.  
  512.     return 0;
  513. }
  514.  
  515. /** Wait for incoming ipc call or answer
  516.  *
  517.  * @param calldata  Pointer to buffer where the call/answer data is stored.
  518.  * @param usec      Timeout. See waitq_sleep_timeout() for explanation.
  519.  * @param flags     Select mode of sleep operation. See waitq_sleep_timeout()
  520.  *          for explanation.
  521.  *
  522.  * @return Callid, if callid & 1, then the call is answer
  523.  */
  524. unative_t sys_ipc_wait_for_call(ipc_data_t *calldata, uint32_t usec, int flags)
  525. {
  526.     call_t *call;
  527.  
  528. restart:   
  529.     call = ipc_wait_for_call(&TASK->answerbox, usec,
  530.         flags | SYNCH_FLAGS_INTERRUPTIBLE);
  531.     if (!call)
  532.         return 0;
  533.  
  534.     if (call->flags & IPC_CALL_NOTIF) {
  535.         ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
  536.  
  537.         /* Set in_phone_hash to the interrupt counter */
  538.         call->data.phone = (void *) call->priv;
  539.        
  540.         STRUCT_TO_USPACE(calldata, &call->data);
  541.  
  542.         ipc_call_free(call);
  543.        
  544.         return ((unative_t)call) | IPC_CALLID_NOTIFICATION;
  545.     }
  546.  
  547.     if (call->flags & IPC_CALL_ANSWERED) {
  548.         process_answer(call);
  549.  
  550.         ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
  551.  
  552.         atomic_dec(&TASK->active_calls);
  553.  
  554.         if (call->flags & IPC_CALL_DISCARD_ANSWER) {
  555.             ipc_call_free(call);
  556.             goto restart;
  557.         }
  558.  
  559.         STRUCT_TO_USPACE(&calldata->args, &call->data.args);
  560.         ipc_call_free(call);
  561.  
  562.         return ((unative_t)call) | IPC_CALLID_ANSWERED;
  563.     }
  564.  
  565.     if (process_request(&TASK->answerbox, call))
  566.         goto restart;
  567.  
  568.     /* Include phone address('id') of the caller in the request,
  569.      * copy whole call->data, not only call->data.args */
  570.     if (STRUCT_TO_USPACE(calldata, &call->data)) {
  571.         return 0;
  572.     }
  573.     return (unative_t)call;
  574. }
  575.  
  576. /** Connect irq handler to task.
  577.  *
  578.  * @param inr IRQ number.
  579.  * @param devno Device number.
  580.  * @param method Method to be associated with the notification.
  581.  * @param ucode Uspace pointer to the top-half pseudocode.
  582.  *
  583.  * @return EPERM or a return code returned by ipc_irq_register().
  584.  */
  585. unative_t sys_ipc_register_irq(inr_t inr, devno_t devno, unative_t method,
  586.     irq_code_t *ucode)
  587. {
  588.     if (!(cap_get(TASK) & CAP_IRQ_REG))
  589.         return EPERM;
  590.  
  591.     return ipc_irq_register(&TASK->answerbox, inr, devno, method, ucode);
  592. }
  593.  
  594. /** Disconnect irq handler from task.
  595.  *
  596.  * @param inr IRQ number.
  597.  * @param devno Device number.
  598.  */
  599. unative_t sys_ipc_unregister_irq(inr_t inr, devno_t devno)
  600. {
  601.     if (!(cap_get(TASK) & CAP_IRQ_REG))
  602.         return EPERM;
  603.  
  604.     ipc_irq_unregister(&TASK->answerbox, inr, devno);
  605.  
  606.     return 0;
  607. }
  608.  
  609. /** @}
  610.  */
  611.