rtems/src/dpmemexternal2internal.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSImplClassicDPMem
0007  *
0008  * @brief This source file contains the implementation of
0009  *   rtems_port_external_to_internal().
0010  */
0011
0012 /*
0013  *  COPYRIGHT (c) 1989-2014.
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/rtems/dpmemimpl.h>
0043 #include <rtems/score/address.h>
0044
0045 rtems_status_code rtems_port_external_to_internal(
0046   rtems_id   id,
0047   void      *external,
0048   void     **internal
0049 )
0050 {
0051   Dual_ported_memory_Control *the_port;
0052   ISR_lock_Context            lock_context;
0053   uintptr_t                   length;
0054
0055   if ( internal == NULL ) {
0056     return RTEMS_INVALID_ADDRESS;
0057   }
0058
0059   the_port = _Dual_ported_memory_Get( id, &lock_context );
0060
0061   if ( the_port == NULL ) {
0062     return RTEMS_INVALID_ID;
0063   }
0064
0065   length = (uintptr_t) _Addresses_Subtract( external, the_port->external_base );
0066
0067   if ( length > the_port->length ) {
0068     *internal = external;
0069   } else {
0070     *internal = _Addresses_Add_offset( the_port->internal_base, length );
0071   }
0072
0073   _ISR_lock_ISR_enable( &lock_context );
0074   return RTEMS_SUCCESSFUL;
0075 }