Subversion Repositories openrisc_2011-10-31

/*

 *  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.OARcorp.com/rtems/license.html.

 *

 *  $Id: dpmemcreate.c,v 1.2 2001-09-27 11:59:19 chris Exp $

 */

#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_create

 *

 *  This directive creates a port into a dual-ported memory area.

 *

 *  Input parameters:

 *    name           - user defined port name

 *    internal_start - internal start address of port

 *    external_start - external start address of port

 *    length         - physical length in bytes

 *    id             - address of port id to set

 *

 *  Output parameters:

 *    id       - port id

 *    RTEMS_SUCCESSFUL - if successful

 *    error code - if unsuccessful

 */

rtems_status_code rtems_port_create(

  rtems_name    name,

  void         *internal_start,

  void         *external_start,

  unsigned32    length,

  Objects_Id   *id

)

{

  register Dual_ported_memory_Control *the_port;

  if ( !rtems_is_name_valid( name) )

    return RTEMS_INVALID_NAME;

  if ( !_Addresses_Is_aligned( internal_start ) ||

       !_Addresses_Is_aligned( external_start ) )

    return RTEMS_INVALID_ADDRESS;

  _Thread_Disable_dispatch();             /* to prevent deletion */

  the_port = _Dual_ported_memory_Allocate();

  if ( !the_port ) {

    _Thread_Enable_dispatch();

    return RTEMS_TOO_MANY;

  }

  the_port->internal_base = internal_start;

  the_port->external_base = external_start;

  the_port->length        = length - 1;

  _Objects_Open(

    &_Dual_ported_memory_Information,

    &the_port->Object,

    &name

  );

  *id = the_port->Object.id;

  _Thread_Enable_dispatch();

  return RTEMS_SUCCESSFUL;

}