score/src/configstackspacesize.c

0001 /**
0002  * @file
0003  *
0004  * @ingroup RTEMSScore
0005  *
0006  * @brief This source file contains the implementation of
0007  *   rtems_configuration_get_stack_space_size().
0008  */
0009 /*
0010  * SPDX-License-Identifier: BSD-2-Clause
0011  *
0012  * Copyright (C) 2014, 2019 embedded brains GmbH & Co. KG
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #ifdef HAVE_CONFIG_H
0037 #include "config.h"
0038 #endif
0039
0040 #include <rtems/config.h>
0041 #include <rtems/score/stack.h>
0042 #include <rtems/score/tls.h>
0043 #include <rtems/score/thread.h>
0044
0045 uintptr_t rtems_configuration_get_stack_space_size( void )
0046 {
0047   uintptr_t space_size;
0048
0049   space_size = _Stack_Space_size;
0050
0051   /*
0052    * In case we have a non-zero TLS size, then we need a TLS area for each
0053    * thread.  These areas are allocated within the stack area from the stack
0054    * space.  Ensure that the stack space is large enough to fulfill all requests
0055    * known at configuration time (so excluding the unlimited option).  It is not
0056    * possible to estimate the TLS size in the configuration at compile-time.
0057    * The TLS size is determined at application link-time.
0058    */
0059   space_size += _Thread_Initial_thread_count * _TLS_Get_allocation_size();
0060
0061   return space_size;
0062 }