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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. #include <ipc/ipc.h>
  30. #include <libc.h>
  31. #include <malloc.h>
  32. #include <errno.h>
  33. #include <libadt/list.h>
  34. #include <stdio.h>
  35. #include <unistd.h>
  36. #include <futex.h>
  37. #include <kernel/synch/synch.h>
  38. #include <async.h>
  39. #include <psthread.h>
  40.  
  41. /** Structure used for keeping track of sent async msgs
  42.  * and queing unsent msgs
  43.  *
  44.  */
  45. typedef struct {
  46.     link_t list;
  47.  
  48.     ipc_async_callback_t callback;
  49.     void *private;
  50.     union {
  51.         ipc_callid_t callid;
  52.         struct {
  53.             ipc_call_t data;
  54.             int phoneid;
  55.         } msg;
  56.     }u;
  57.     pstid_t ptid;   /**< Thread waiting for sending this msg */
  58. } async_call_t;
  59.  
  60. LIST_INITIALIZE(dispatched_calls);
  61.  
  62. /* queued_calls is protcted by async_futex, because if the
  63.  * call cannot be sent into kernel, async framework is used
  64.  * automatically
  65.  */
  66. LIST_INITIALIZE(queued_calls); /**< List of async calls that were not accepted
  67.                 *   by kernel */
  68.  
  69. static atomic_t ipc_futex = FUTEX_INITIALIZER;
  70.  
  71. int ipc_call_sync(int phoneid, ipcarg_t method, ipcarg_t arg1,
  72.           ipcarg_t *result)
  73. {
  74.     ipc_call_t resdata;
  75.     int callres;
  76.    
  77.     callres = __SYSCALL4(SYS_IPC_CALL_SYNC_FAST, phoneid, method, arg1,
  78.                  (sysarg_t)&resdata);
  79.     if (callres)
  80.         return callres;
  81.     if (result)
  82.         *result = IPC_GET_ARG1(resdata);
  83.     return IPC_GET_RETVAL(resdata);
  84. }
  85.  
  86. int ipc_call_sync_3(int phoneid, ipcarg_t method, ipcarg_t arg1,
  87.             ipcarg_t arg2, ipcarg_t arg3,
  88.             ipcarg_t *result1, ipcarg_t *result2, ipcarg_t *result3)
  89. {
  90.     ipc_call_t data;
  91.     int callres;
  92.  
  93.     IPC_SET_METHOD(data, method);
  94.     IPC_SET_ARG1(data, arg1);
  95.     IPC_SET_ARG2(data, arg2);
  96.     IPC_SET_ARG3(data, arg3);
  97.  
  98.     callres = __SYSCALL3(SYS_IPC_CALL_SYNC, phoneid, (sysarg_t)&data,
  99.                  (sysarg_t)&data);
  100.     if (callres)
  101.         return callres;
  102.  
  103.     if (result1)
  104.         *result1 = IPC_GET_ARG1(data);
  105.     if (result2)
  106.         *result2 = IPC_GET_ARG2(data);
  107.     if (result3)
  108.         *result3 = IPC_GET_ARG3(data);
  109.     return IPC_GET_RETVAL(data);
  110. }
  111.  
  112. /** Syscall to send asynchronous message */
  113. static  ipc_callid_t _ipc_call_async(int phoneid, ipc_call_t *data)
  114. {
  115.     return __SYSCALL2(SYS_IPC_CALL_ASYNC, phoneid, (sysarg_t)data);
  116. }
  117.  
  118. /** Send asynchronous message
  119.  *
  120.  * - if fatal error, call callback handler with proper error code
  121.  * - if message cannot be temporarily sent, add to queue
  122.  */
  123. void ipc_call_async_2(int phoneid, ipcarg_t method, ipcarg_t arg1,
  124.               ipcarg_t arg2, void *private,
  125.               ipc_async_callback_t callback)
  126. {
  127.     async_call_t *call;
  128.     ipc_callid_t callid;
  129.  
  130.     call = malloc(sizeof(*call));
  131.     if (!call) {
  132.         if (callback)
  133.             callback(private, ENOMEM, NULL);
  134.         return;
  135.     }
  136.  
  137.     call->callback = callback;
  138.     call->private = private;
  139.  
  140.     /* We need to make sure that we get callid before
  141.      * another thread accesses the queue again */
  142.     futex_down(&ipc_futex);
  143.     callid = __SYSCALL4(SYS_IPC_CALL_ASYNC_FAST, phoneid, method, arg1, arg2);
  144.     if (callid == IPC_CALLRET_FATAL) {
  145.         futex_up(&ipc_futex);
  146.         /* Call asynchronous handler with error code */
  147.         if (callback)
  148.             callback(private, ENOENT, NULL);
  149.         free(call);
  150.         return;
  151.     }
  152.  
  153.     if (callid == IPC_CALLRET_TEMPORARY) {
  154.         futex_up(&ipc_futex);
  155.  
  156.         call->u.msg.phoneid = phoneid;
  157.         IPC_SET_METHOD(call->u.msg.data, method);
  158.         IPC_SET_ARG1(call->u.msg.data, arg1);
  159.         IPC_SET_ARG2(call->u.msg.data, arg2);
  160.  
  161.         call->ptid = psthread_get_id();
  162.         futex_down(&async_futex);
  163.         list_append(&call->list, &queued_calls);
  164.  
  165.         psthread_schedule_next_adv(PS_TO_MANAGER);
  166.         /* Async futex unlocked by previous call */
  167.         return;
  168.     }
  169.     call->u.callid = callid;
  170.     /* Add call to list of dispatched calls */
  171.     list_append(&call->list, &dispatched_calls);
  172.     futex_up(&ipc_futex);
  173. }
  174.  
  175.  
  176. /** Send a fast answer to a received call.
  177.  *
  178.  * The fast answer makes use of passing retval and first two arguments in registers.
  179.  * If you need to return more, use the ipc_answer() instead.
  180.  *
  181.  * @param callid ID of the call being answered.
  182.  * @param retval Return value.
  183.  * @param arg1 First return argument.
  184.  * @param arg2 Second return argument.
  185.  *
  186.  * @return Zero on success or a value from @ref errno.h on failure.
  187.  */
  188. ipcarg_t ipc_answer_fast(ipc_callid_t callid, ipcarg_t retval, ipcarg_t arg1,
  189.         ipcarg_t arg2)
  190. {
  191.     return __SYSCALL4(SYS_IPC_ANSWER_FAST, callid, retval, arg1, arg2);
  192. }
  193.  
  194. /** Send a full answer to a received call.
  195.  *
  196.  * @param callid ID of the call being answered.
  197.  * @param call Call data. Must be already initialized by the responder.
  198.  *
  199.  * @return Zero on success or a value from @ref errno.h on failure.
  200.  */
  201. ipcarg_t ipc_answer(ipc_callid_t callid, ipc_call_t *call)
  202. {
  203.     return __SYSCALL2(SYS_IPC_ANSWER, callid, (sysarg_t) call);
  204. }
  205.  
  206.  
  207. /** Try to dispatch queed calls from async queue */
  208. static void try_dispatch_queued_calls(void)
  209. {
  210.     async_call_t *call;
  211.     ipc_callid_t callid;
  212.  
  213.     /* TODO: integrate intelligently ipc_futex, so that it
  214.      * is locked during ipc_call_async, until it is added
  215.      * to dispatched_calls
  216.      */
  217.     futex_down(&async_futex);
  218.     while (!list_empty(&queued_calls)) {
  219.         call = list_get_instance(queued_calls.next, async_call_t,
  220.                      list);
  221.  
  222.         callid = _ipc_call_async(call->u.msg.phoneid,
  223.                      &call->u.msg.data);
  224.         if (callid == IPC_CALLRET_TEMPORARY) {
  225.             break;
  226.         }
  227.         list_remove(&call->list);
  228.  
  229.         futex_up(&async_futex);
  230.         psthread_add_ready(call->ptid);
  231.        
  232.         if (callid == IPC_CALLRET_FATAL) {
  233.             if (call->callback)
  234.                 call->callback(call->private, ENOENT, NULL);
  235.             free(call);
  236.         } else {
  237.             call->u.callid = callid;
  238.             futex_down(&ipc_futex);
  239.             list_append(&call->list, &dispatched_calls);
  240.             futex_up(&ipc_futex);
  241.         }
  242.         futex_down(&async_futex);
  243.     }
  244.     futex_up(&async_futex);
  245. }
  246.  
  247. /** Handle received answer
  248.  *
  249.  * TODO: Make it use hash table
  250.  *
  251.  * @param callid Callid (with first bit set) of the answered call
  252.  */
  253. static void handle_answer(ipc_callid_t callid, ipc_call_t *data)
  254. {
  255.     link_t *item;
  256.     async_call_t *call;
  257.  
  258.     callid &= ~IPC_CALLID_ANSWERED;
  259.    
  260.     futex_down(&ipc_futex);
  261.     for (item = dispatched_calls.next; item != &dispatched_calls;
  262.          item = item->next) {
  263.         call = list_get_instance(item, async_call_t, list);
  264.         if (call->u.callid == callid) {
  265.             list_remove(&call->list);
  266.             futex_up(&ipc_futex);
  267.             if (call->callback)
  268.                 call->callback(call->private,
  269.                            IPC_GET_RETVAL(*data),
  270.                            data);
  271.             free(call);
  272.             return;
  273.         }
  274.     }
  275.     futex_up(&ipc_futex);
  276.     printf("Received unidentified answer: %P!!!\n", callid);
  277. }
  278.  
  279.  
  280. /** One cycle of ipc wait for call call
  281.  *
  282.  * - dispatch ASYNC reoutines in the background
  283.  * @param call Space where the message is stored
  284.  * @param usec Timeout in microseconds
  285.  * @param flags Flags passed to SYS_IPC_WAIT (blocking, nonblocking)
  286.  * @return Callid of the answer.
  287.  */
  288. ipc_callid_t ipc_wait_cycle(ipc_call_t *call, uint32_t usec, int flags)
  289. {
  290.     ipc_callid_t callid;
  291.  
  292.     callid = __SYSCALL3(SYS_IPC_WAIT, (sysarg_t) call, usec, flags);
  293.     /* Handle received answers */
  294.     if (callid & IPC_CALLID_ANSWERED) {
  295.         handle_answer(callid, call);
  296.         try_dispatch_queued_calls();
  297.     }
  298.  
  299.     return callid;
  300. }
  301.  
  302. /** Wait some time for an IPC call.
  303.  *
  304.  * - dispatch ASYNC reoutines in the background
  305.  * @param call Space where the message is stored
  306.  * @param usec Timeout in microseconds.
  307.  * @return Callid of the answer.
  308.  */
  309. ipc_callid_t ipc_wait_for_call_timeout(ipc_call_t *call, uint32_t usec)
  310. {
  311.     ipc_callid_t callid;
  312.  
  313.     do {
  314.         callid = ipc_wait_cycle(call, usec, SYNCH_BLOCKING);
  315.     } while (callid & IPC_CALLID_ANSWERED);
  316.  
  317.     return callid;
  318. }
  319.  
  320. /** Check if there is an IPC call waiting to be picked up.
  321.  *
  322.  * - dispatch ASYNC reoutines in the background
  323.  * @param call Space where the message is stored
  324.  * @return Callid of the answer.
  325.  */
  326. ipc_callid_t ipc_trywait_for_call(ipc_call_t *call)
  327. {
  328.     ipc_callid_t callid;
  329.  
  330.     do {
  331.         callid = ipc_wait_cycle(call, SYNCH_NO_TIMEOUT, SYNCH_NON_BLOCKING);
  332.     } while (callid & IPC_CALLID_ANSWERED);
  333.  
  334.     return callid;
  335. }
  336.  
  337. /** Ask destination to do a callback connection
  338.  *
  339.  * @return 0 - OK, error code
  340.  */
  341. int ipc_connect_to_me(int phoneid, int arg1, int arg2, ipcarg_t *phone)
  342. {
  343.     return ipc_call_sync_3(phoneid, IPC_M_CONNECT_TO_ME, arg1,
  344.                    arg2, 0, 0, 0, phone);
  345. }
  346.  
  347. /** Ask through phone for a new connection to some service
  348.  *
  349.  * @return new phoneid - OK, error code
  350.  */
  351. int ipc_connect_me_to(int phoneid, int arg1, int arg2)
  352. {
  353.     ipcarg_t newphid;
  354.     int res;
  355.  
  356.     res =  ipc_call_sync_3(phoneid, IPC_M_CONNECT_ME_TO, arg1,
  357.                    arg2, 0, 0, 0, &newphid);
  358.     if (res)
  359.         return res;
  360.     return newphid;
  361. }
  362.  
  363. /* Hang up specified phone */
  364. int ipc_hangup(int phoneid)
  365. {
  366.     return __SYSCALL1(SYS_IPC_HANGUP, phoneid);
  367. }
  368.  
  369. int ipc_register_irq(int irq, irq_code_t *ucode)
  370. {
  371.     return __SYSCALL2(SYS_IPC_REGISTER_IRQ, irq, (sysarg_t) ucode);
  372. }
  373.  
  374. int ipc_unregister_irq(int irq)
  375. {
  376.     return __SYSCALL1(SYS_IPC_UNREGISTER_IRQ, irq);
  377. }
  378.  
  379. int ipc_forward_fast(ipc_callid_t callid, int phoneid, int method, ipcarg_t arg1)
  380. {
  381.     return __SYSCALL4(SYS_IPC_FORWARD_FAST, callid, phoneid, method, arg1);
  382. }
  383.  
  384.  
  385. /** Open shared memory connection over specified phoneid
  386.  *
  387.  *
  388.  * Allocate as_area, notify the other side about our intention
  389.  * to open the connection
  390.  *
  391.  * @return Connection id identifying this connection
  392.  */
  393. //int ipc_dgr_open(int pohoneid, size_t bufsize)
  394. //{
  395.     /* Find new file descriptor in local descriptor table */
  396.     /* Create AS_area, initialize structures */
  397.     /* Send AS to other side, handle error states */
  398.  
  399. //}
  400. /*
  401. void ipc_dgr_close(int cid)
  402. {
  403. }
  404.  
  405. void * ipc_dgr_alloc(int cid, size_t size)
  406. {
  407. }
  408.  
  409. void ipc_dgr_free(int cid, void *area)
  410. {
  411.  
  412. }
  413.  
  414. int ipc_dgr_send(int cid, void *area)
  415. {
  416. }
  417.  
  418.  
  419. int ipc_dgr_send_data(int cid, void *data, size_t size)
  420. {
  421. }
  422.  
  423. */
  424.