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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.

 *

 *  regioncreate.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_create

 *

 *  This directive creates a region of physical contiguous memory area

 *  from which variable sized segments can be allocated.

 *

 *  Input parameters:

 *    name             - user defined region name

 *    starting_address - physical start address of region

 *    length           - physical length in bytes

 *    page_size        - page size in bytes

 *    attribute_set    - region attributes

 *    id               - address of region id to set

 *

 *  Output parameters:

 *    id       - region id

 *    RTEMS_SUCCESSFUL - if successful

 *    error code - if unsuccessful

 */

rtems_status_code rtems_region_create(

  rtems_name          name,

  void               *starting_address,

  unsigned32          length,

  unsigned32          page_size,

  rtems_attribute  attribute_set,

  Objects_Id         *id

)

{

  Region_Control *the_region;

  if ( !rtems_is_name_valid( name ) )

    return RTEMS_INVALID_NAME;

  if ( !_Addresses_Is_aligned( starting_address ) )

    return RTEMS_INVALID_ADDRESS;

  _RTEMS_Lock_allocator();                      /* to prevent deletion */

  the_region = _Region_Allocate();

  if ( !the_region ) {

    _RTEMS_Unlock_allocator();

    return RTEMS_TOO_MANY;

  }

  the_region->maximum_segment_size =

    _Heap_Initialize(&the_region->Memory, starting_address, length, page_size);

  if ( !the_region->maximum_segment_size ) {

    _Region_Free( the_region );

    _RTEMS_Unlock_allocator();

    return RTEMS_INVALID_SIZE;

  }

  the_region->starting_address      = starting_address;

  the_region->length                = length;

  the_region->page_size             = page_size;

  the_region->attribute_set         = attribute_set;

  the_region->number_of_used_blocks = 0;

  _Thread_queue_Initialize(

    &the_region->Wait_queue,

    _Attributes_Is_priority( attribute_set ) ?

       THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO,

    STATES_WAITING_FOR_SEGMENT,

    RTEMS_TIMEOUT

  );

  _Objects_Open( &_Region_Information, &the_region->Object, name );

  *id = the_region->Object.id;

  _RTEMS_Unlock_allocator();

  return RTEMS_SUCCESSFUL;

}