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/*

 *  Region 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.

 *

 *  regionextend.c,v 1.3 2002/07/01 22:32:31 joel Exp

 */

#include <rtems/system.h>

#include <rtems/rtems/status.h>

#include <rtems/rtems/support.h>

#include <rtems/score/object.h>

#include <rtems/rtems/options.h>

#include <rtems/rtems/region.h>

#include <rtems/score/states.h>

#include <rtems/score/thread.h>

#include <rtems/score/apimutex.h>

/*PAGE

 *

 *  rtems_region_extend

 *

 *  This directive attempts to grow a region of physical contiguous memory area

 *  from which variable sized segments can be allocated.

 *

 *  Input parameters:

 *    id         - id of region to grow

 *    start      - starting address of memory area for extension

 *    length     - physical length in bytes to grow the region

 *

 *  Output parameters:

 *    RTEMS_SUCCESSFUL - if successful

 *    error code       - if unsuccessful

 */

rtems_status_code rtems_region_extend(

  Objects_Id          id,

  void               *starting_address,

  unsigned32          length

)

{

  Region_Control     *the_region;

  Objects_Locations   location;

  unsigned32          amount_extended;

  Heap_Extend_status  heap_status;

  rtems_status_code   status;

  status = RTEMS_SUCCESSFUL;

  _RTEMS_Lock_allocator();                      /* to prevent deletion */

  the_region = _Region_Get( id, &location );

  switch ( location ) {

    case OBJECTS_REMOTE:        /* this error cannot be returned */

      _RTEMS_Unlock_allocator();

      return RTEMS_INTERNAL_ERROR;

    case OBJECTS_ERROR:

      _RTEMS_Unlock_allocator();

      return RTEMS_INVALID_ID;

    case OBJECTS_LOCAL:

      heap_status = _Heap_Extend(

        &the_region->Memory,

        starting_address,

        length,

        &amount_extended

      );

      switch ( heap_status ) {

        case HEAP_EXTEND_SUCCESSFUL:

          the_region->length                += amount_extended;

          the_region->maximum_segment_size  += amount_extended;

          break;

        case HEAP_EXTEND_ERROR:

          status = RTEMS_INVALID_ADDRESS;

          break;

        case HEAP_EXTEND_NOT_IMPLEMENTED:

          status = RTEMS_NOT_IMPLEMENTED;

          break;

      }

      _RTEMS_Unlock_allocator();

      return( status );

  }

  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */

}