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