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  1. /*
  2.  * Copyright (C) 2006 Jakub Jermar
  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 libc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <thread.h>
  36. #include <libc.h>
  37. #include <stdlib.h>
  38. #include <arch/faddr.h>
  39. #include <kernel/proc/uarg.h>
  40. #include <psthread.h>
  41. #include <string.h>
  42. #include <async.h>
  43.  
  44. #include <stdio.h>
  45.  
  46.  
  47. #ifndef THREAD_INITIAL_STACK_PAGES_NO
  48. #define THREAD_INITIAL_STACK_PAGES_NO 1
  49. #endif
  50.  
  51. static LIST_INITIALIZE(thread_garbage);
  52.  
  53. extern char _tdata_start;
  54. extern char _tdata_end;
  55. extern char _tbss_start;
  56. extern char _tbss_end;
  57.  
  58. /** Create Thread Local storage area, return pointer to TCB(ThreadControlBlock)
  59.  *
  60.  * !! The code requires, that sections .tdata and .tbss are adjacent.
  61.  *    It may be changed in the future.
  62.  */
  63. tcb_t * __make_tls(void)
  64. {
  65.     void *data;
  66.     tcb_t *tcb;
  67.     size_t tls_size = &_tbss_end - &_tdata_start;
  68.    
  69.     tcb = __alloc_tls(&data, tls_size);
  70.    
  71.     memcpy(data, &_tdata_start, &_tdata_end - &_tdata_start);
  72.     memset(data + (&_tbss_start-&_tdata_start), 0, &_tbss_end-&_tbss_start);
  73.     return tcb;
  74. }
  75.  
  76. void __free_tls(tcb_t *tcb)
  77. {
  78.     size_t tls_size = &_tbss_end - &_tdata_start;
  79.     __free_tls_arch(tcb, tls_size);
  80. }
  81.  
  82. /** Main thread function.
  83.  *
  84.  * This function is called from __thread_entry() and is used
  85.  * to call the thread's implementing function and perform cleanup
  86.  * and exit when thread returns back. Do not call this function
  87.  * directly.
  88.  *
  89.  * @param uarg Pointer to userspace argument structure.
  90.  *
  91.  * TODO: Thread stack pages memory leak
  92.  */
  93. void __thread_main(uspace_arg_t *uarg)
  94. {
  95.     psthread_data_t *pt;
  96.  
  97.     pt = psthread_setup();
  98.     __tcb_set(pt->tcb);
  99.    
  100.     uarg->uspace_thread_function(uarg->uspace_thread_arg);
  101.     free(uarg->uspace_stack);
  102.     free(uarg);
  103.  
  104.     /* If there is a manager, destroy it */
  105.     async_destroy_manager();
  106.     psthread_teardown(pt);
  107.  
  108.     thread_exit(0);
  109. }
  110.  
  111. /** Create userspace thread.
  112.  *
  113.  * This function creates new userspace thread and allocates userspace
  114.  * stack and userspace argument structure for it.
  115.  *
  116.  * @param function Function implementing the thread.
  117.  * @param arg Argument to be passed to thread.
  118.  * @param name Symbolic name of the thread.
  119.  *
  120.  * @return TID of the new thread on success or -1 on failure.
  121.  */
  122. int thread_create(void (* function)(void *), void *arg, char *name)
  123. {
  124.     char *stack;
  125.     uspace_arg_t *uarg;
  126.  
  127.     stack = (char *) malloc(getpagesize()*THREAD_INITIAL_STACK_PAGES_NO);
  128.     if (!stack)
  129.         return -1;
  130.        
  131.     uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t));
  132.     if (!uarg) {
  133.         free(stack);
  134.         return -1;
  135.     }
  136.    
  137.     uarg->uspace_entry = (void *) FADDR(__thread_entry);
  138.     uarg->uspace_stack = (void *) stack;
  139.     uarg->uspace_thread_function = function;
  140.     uarg->uspace_thread_arg = arg;
  141.     uarg->uspace_uarg = uarg;
  142.    
  143.     return __SYSCALL2(SYS_THREAD_CREATE, (sysarg_t) uarg, (sysarg_t) name);
  144. }
  145.  
  146. /** Terminate current thread.
  147.  *
  148.  * @param status Exit status. Currently not used.
  149.  */
  150. void thread_exit(int status)
  151. {
  152.     __SYSCALL1(SYS_THREAD_EXIT, (sysarg_t) status);
  153. }
  154.  
  155.  
  156.  
  157.  /** @}
  158.  */
  159.  
  160.  
  161.