score/src/percpu.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSScorePerCPU
0007  *
0008  * @brief This source file contains the uniprocessor definition of
0009  *   ::_Per_CPU_Information and some static assertions.
0010  */
0011
0012 /*
0013  *  COPYRIGHT (c) 1989-2011.
0014  *  On-Line Applications Research Corporation (OAR).
0015  *
0016  * Redistribution and use in source and binary forms, with or without
0017  * modification, are permitted provided that the following conditions
0018  * are met:
0019  * 1. Redistributions of source code must retain the above copyright
0020  *    notice, this list of conditions and the following disclaimer.
0021  * 2. Redistributions in binary form must reproduce the above copyright
0022  *    notice, this list of conditions and the following disclaimer in the
0023  *    documentation and/or other materials provided with the distribution.
0024  *
0025  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0026  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0027  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0028  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0029  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0030  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0031  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0032  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0033  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0034  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0035  * POSSIBILITY OF SUCH DAMAGE.
0036  */
0037
0038 #ifdef HAVE_CONFIG_H
0039 #include "config.h"
0040 #endif
0041
0042 #include <rtems/score/percpu.h>
0043
0044 RTEMS_STATIC_ASSERT(
0045   sizeof( CPU_Uint32ptr ) >= sizeof( uintptr_t ),
0046   CPU_Uint32ptr_greater_equal_uintptr_t
0047 );
0048
0049 RTEMS_STATIC_ASSERT(
0050   sizeof( CPU_Uint32ptr ) >= sizeof( uint32_t ),
0051   CPU_Uint32ptr_greater_equal_uint32_t
0052 );
0053
0054 #if !defined(RTEMS_SMP)
0055   /*
0056    * On single core systems, we can efficiently directly access a single
0057    * statically allocated per cpu structure.  And the fields are initialized
0058    * as individual elements just like it has always been done.
0059    */
0060   Per_CPU_Control_envelope _Per_CPU_Information[1];
0061 #endif