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/*
* Dual Port Memory Manager
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#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_internal_to_external
*
* This directive converts an internal dual-ported memory address to an
* external dual-ported memory address. If the given internal address
* is an invalid dual-ported address, then the external address is set
* to the given internal address.
*
* Input parameters:
* id - id of dual-ported memory object
* internal - internal address to set
* external - pointer to external address
*
* Output parameters:
* external - external address
* RTEMS_SUCCESSFUL - always succeeds
*/
rtems_status_code rtems_port_internal_to_external(
Objects_Id id,
void *internal,
void **external
)
{
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( internal, the_port->internal_base );
if ( ending > the_port->length )
*external = internal;
else
*external = _Addresses_Add_offset( the_port->external_base,
ending );
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */
}
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