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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 <mm/as.h>
  32. #include <print.h>
  33. #include <putchar.h>
  34. #include <ipc/ipc.h>
  35. #include <errno.h>
  36. #include <proc/task.h>
  37. #include <arch.h>
  38. #include <debug.h>
  39.  
  40. static __native sys_ctl(void) {
  41.     printf("Thread finished\n");
  42.     thread_exit();
  43.     /* Unreachable */
  44.     return 0;
  45. }
  46.  
  47. static __native sys_io(int fd, const void * buf, size_t count) {
  48.    
  49.     // TODO: buf sanity checks and a lot of other stuff ...
  50.  
  51.     size_t i;
  52.    
  53.     for (i = 0; i < count; i++)
  54.         putchar(((char *) buf)[i]);
  55.    
  56.     return count;
  57. }
  58.  
  59. /** Send a call over IPC, wait for reply, return to user
  60.  *
  61.  * @return Call identification, returns -1 on fatal error,
  62.            -2 on 'Too many async request, handle answers first
  63.  */
  64. static __native sys_ipc_call_sync(__native phoneid, __native method,
  65.                    __native arg1, __native *data)
  66. {
  67.     call_t call;
  68.     phone_t *phone;
  69.     /* Special answerbox for synchronous messages */
  70.  
  71.     if (phoneid >= IPC_MAX_PHONES)
  72.         return IPC_CALLRET_FATAL;
  73.  
  74.     phone = &TASK->phones[phoneid];
  75.     if (!phone->callee)
  76.         return IPC_CALLRET_FATAL;
  77.  
  78.     ipc_call_init(&call);
  79.     IPC_SET_METHOD(call.data, method);
  80.     IPC_SET_ARG1(call.data, arg1);
  81.    
  82.     ipc_call_sync(phone, &call);
  83.  
  84.     copy_to_uspace(data, &call.data, sizeof(call.data));
  85.  
  86.     return 0;
  87. }
  88.  
  89. static __native sys_ipc_call_sync_medium(__native phoneid, __native *data)
  90. {
  91.     call_t call;
  92.     phone_t *phone;
  93.     /* Special answerbox for synchronous messages */
  94.  
  95.     if (phoneid >= IPC_MAX_PHONES)
  96.         return IPC_CALLRET_FATAL;
  97.  
  98.     phone = &TASK->phones[phoneid];
  99.     if (!phone->callee)
  100.         return IPC_CALLRET_FATAL;
  101.  
  102.     ipc_call_init(&call);
  103.     copy_from_uspace(&call.data, data, sizeof(call.data));
  104.    
  105.     ipc_call_sync(phone, &call);
  106.  
  107.     copy_to_uspace(data, &call.data, sizeof(call.data));
  108.  
  109.     return 0;
  110. }
  111.  
  112.  
  113. /** Send an asynchronous call over ipc
  114.  *
  115.  * @return Call identification, returns -1 on fatal error,
  116.            -2 on 'Too many async request, handle answers first
  117.  */
  118. static __native sys_ipc_call_async(__native phoneid, __native method,
  119.                    __native arg1, __native arg2)
  120. {
  121.     call_t *call;
  122.     phone_t *phone;
  123.  
  124.     if (phoneid >= IPC_MAX_PHONES)
  125.         return IPC_CALLRET_FATAL;
  126.  
  127.     phone = &TASK->phones[phoneid];
  128.     if (!phone->callee)
  129.         return IPC_CALLRET_FATAL;
  130.  
  131.     /* TODO: Check that we did not exceed system imposed maximum
  132.      * of asynchrnously sent messages
  133.      * - the userspace should be able to handle it correctly
  134.      */
  135.     call = ipc_call_alloc();
  136.     IPC_SET_METHOD(call->data, method);
  137.     IPC_SET_ARG1(call->data, arg1);
  138.     IPC_SET_ARG2(call->data, arg2);
  139.  
  140.     ipc_call(phone, call);
  141.  
  142.     return (__native) call;
  143. }
  144.  
  145. /** Send IPC answer */
  146. static __native sys_ipc_answer(__native callid, __native retval, __native arg1,
  147.                    __native arg2)
  148. {
  149.     call_t *call;
  150.  
  151.     /* Check that the user is not sending us answer callid */
  152.     ASSERT(! (callid & 1));
  153.     /* TODO: Check that the callid is in the dispatch table */
  154.     call = (call_t *) callid;
  155.  
  156.     IPC_SET_RETVAL(call->data, retval);
  157.     IPC_SET_ARG1(call->data, arg1);
  158.     IPC_SET_ARG2(call->data, arg2);
  159.  
  160.     ipc_answer(&TASK->answerbox, call);
  161.     return 0;
  162. }
  163.  
  164. /** Wait for incoming ipc call or answer
  165.  *
  166.  * @param result
  167.  * @param flags
  168.  * @return Callid, if callid & 1, then the call is answer
  169.  */
  170. static __native sys_ipc_wait_for_call(__native *calldata, __native flags)
  171. {
  172.     call_t *call;
  173.    
  174.     call = ipc_wait_for_call(&TASK->answerbox, flags);
  175.  
  176.     copy_to_uspace(calldata, &call->data, sizeof(call->data));
  177.     if (call->flags & IPC_CALL_ANSWERED) {
  178.         ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
  179.         ipc_call_free(call);
  180.         return ((__native)call) | IPC_CALLID_ANSWERED;
  181.     }
  182.     return (__native)call;
  183. }
  184.  
  185. static __native sys_mremap(void *address, size_t size, unsigned long flags)
  186. {
  187.     return as_remap(AS, (__address) address, size, 0);
  188. }
  189.  
  190. syshandler_t syscall_table[SYSCALL_END] = {
  191.     sys_ctl,
  192.     sys_io,
  193.     sys_mremap,
  194.     sys_ipc_call_sync,
  195.     sys_ipc_call_sync_medium,
  196.     sys_ipc_call_async,
  197.     sys_ipc_answer,
  198.     sys_ipc_wait_for_call
  199. };
  200.