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/*
* Dual Port Memory Manager
*
* COPYRIGHT (c) 1989-1999.
* 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.com/license/LICENSE.
*
* $Id$
*/
#include <rtems/system.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>
#include <rtems/score/address.h>
#include <rtems/rtems/dpmem.h>
#include <rtems/score/object.h>
#include <rtems/score/thread.h>
#include <rtems/rtems/dpmem.h>
/*PAGE
*
* rtems_port_external_to_internal
*
* This directive converts an external dual-ported memory address to an
* internal dual-ported memory address. If the given external address
* is an invalid dual-ported address, then the internal address is set
* to the given external address.
*
* Input parameters:
* id - id of dp memory object
* external - external address
* internal - pointer of internal address to set
*
* Output parameters:
* internal - internal address
* RTEMS_SUCCESSFUL - always succeeds
*/
rtems_status_code rtems_port_external_to_internal(
Objects_Id id,
void *external,
void **internal
)
{
register Dual_ported_memory_Control *the_port;
Objects_Locations location;
unsigned32 ending;
the_port = _Dual_ported_memory_Get( id, &location );
switch ( location ) {
case OBJECTS_REMOTE: /* this error cannot be returned */
return RTEMS_INTERNAL_ERROR;
case OBJECTS_ERROR:
return RTEMS_INVALID_ID;
case OBJECTS_LOCAL:
ending = _Addresses_Subtract( external, the_port->external_base );
if ( ending > the_port->length )
*internal = external;
else
*internal = _Addresses_Add_offset( the_port->internal_base,
ending );
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */
}
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