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  1. /*
  2.  * Copyright (C) 2005 Martin Decky
  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 <syscall/syscall.h>
  30. #include <proc/thread.h>
  31. #include <print.h>
  32. #include <putchar.h>
  33. #include <ipc/ipc.h>
  34. #include <errno.h>
  35. #include <proc/task.h>
  36. #include <arch.h>
  37. #include <debug.h>
  38.  
  39. static __native sys_ctl(void) {
  40.     printf("Thread finished\n");
  41.     thread_exit();
  42.     /* Unreachable */
  43.     return 0;
  44. }
  45.  
  46. static __native sys_io(int fd, const void * buf, size_t count) {
  47.    
  48.     // TODO: buf sanity checks and a lot of other stuff ...
  49.  
  50.     size_t i;
  51.    
  52.     for (i = 0; i < count; i++)
  53.         putchar(((char *) buf)[i]);
  54.    
  55.     return count;
  56. }
  57.  
  58. /** Send a call over IPC, wait for reply, return to user
  59.  *
  60.  * @return Call identification, returns -1 on fatal error,
  61.            -2 on 'Too many async request, handle answers first
  62.  */
  63. static __native sys_ipc_call_sync(__native phoneid, __native arg1,
  64.                    __native arg2, __native *respdata)
  65. {
  66.     call_t *call;
  67.     phone_t *phone;
  68.     /* Special answerbox for synchronous messages */
  69.  
  70.     if (phoneid >= IPC_MAX_PHONES)
  71.         return -ENOENT;
  72.  
  73.     phone = &TASK->phones[phoneid];
  74.     if (!phone->callee)
  75.         return -ENOENT;
  76.  
  77.     call = ipc_call_alloc();
  78.     call->data[0] = arg1;
  79.     call->data[1] = arg2;
  80.    
  81.     ipc_call_sync(phone, call);
  82.  
  83.     copy_to_uspace(respdata, &call->data, sizeof(__native) * IPC_CALL_LEN);
  84.  
  85.     return 0;
  86. }
  87.  
  88. /** Send an asynchronous call over ipc
  89.  *
  90.  * @return Call identification, returns -1 on fatal error,
  91.            -2 on 'Too many async request, handle answers first
  92.  */
  93. static __native sys_ipc_call_async(__native phoneid, __native arg1,
  94.                    __native arg2)
  95. {
  96.     call_t *call;
  97.     phone_t *phone;
  98.  
  99.     if (phoneid >= IPC_MAX_PHONES)
  100.         return -ENOENT;
  101.  
  102.     phone = &TASK->phones[phoneid];
  103.     if (!phone->callee)
  104.         return -ENOENT;
  105.  
  106.  
  107.     /* TODO: Check that we did not exceed system imposed maximum
  108.      * of asynchrnously sent messages
  109.      * - the userspace should be able to handle it correctly
  110.      */
  111.     call = ipc_call_alloc();
  112.     call->data[0] = arg1;
  113.     call->data[1] = arg2;
  114.     ipc_call(phone, call);
  115.  
  116.     return (__native) call;
  117. }
  118.  
  119. /** Send IPC answer */
  120. static __native sys_ipc_answer(__native callid, __native arg1, __native arg2)
  121. {
  122.     call_t *call;
  123.  
  124.     /* Check that the user is not sending us answer callid */
  125.     ASSERT(! (callid & 1));
  126.     /* TODO: Check that the callid is in the dispatch table */
  127.     call = (call_t *) callid;
  128.  
  129.     call->data[0] = arg1;
  130.     call->data[1] = arg2;
  131.  
  132.     ipc_answer(&TASK->answerbox, call);
  133.     return 0;
  134. }
  135.  
  136. /** Wait for incoming ipc call or answer
  137.  *
  138.  * @param result
  139.  * @param flags
  140.  * @return Callid, if callid & 1, then the call is answer
  141.  */
  142. static __native sys_ipc_wait_for_call(__native *calldata, __native flags)
  143. {
  144.     call_t *call;
  145.    
  146.     call = ipc_wait_for_call(&TASK->answerbox, flags);
  147.     copy_to_uspace(calldata, &call->data, sizeof(__native) * IPC_CALL_LEN);
  148.  
  149.     if (call->flags & IPC_CALL_ANSWERED)
  150.         return ((__native)call) | 1;
  151.     return (__native)call;
  152. }
  153.  
  154.  
  155. syshandler_t syscall_table[SYSCALL_END] = {
  156.     sys_ctl,
  157.     sys_io,
  158.     sys_ipc_call_sync,
  159.     sys_ipc_call_async,
  160.     sys_ipc_answer,
  161.     sys_ipc_wait_for_call
  162. };
  163.