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/**
* @file
*
* @brief RTEMS Port External to Internal
* @ingroup ClassicDPMEM
*/
/*
* COPYRIGHT (c) 1989-2014.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/dpmemimpl.h>
#include <rtems/score/address.h>
rtems_status_code rtems_port_external_to_internal(
rtems_id id,
void *external,
void **internal
)
{
Dual_ported_memory_Control *the_port;
ISR_lock_Context lock_context;
uintptr_t length;
if ( internal == NULL ) {
return RTEMS_INVALID_ADDRESS;
}
the_port = _Dual_ported_memory_Get( id, &lock_context );
if ( the_port == NULL ) {
return RTEMS_INVALID_ID;
}
length = (uintptr_t) _Addresses_Subtract( external, the_port->external_base );
if ( length > the_port->length ) {
*internal = external;
} else {
*internal = _Addresses_Add_offset( the_port->internal_base, length );
}
_ISR_lock_ISR_enable( &lock_context );
return RTEMS_SUCCESSFUL;
}
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