partcreate.c

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

/*
 *  Partition 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: partcreate.c,v 1.4.2.2 2004/05/06 19:20:04 joel Exp $
 */

#include <rtems/system.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>
#include <rtems/score/address.h>
#include <rtems/score/object.h>
#include <rtems/rtems/part.h>
#include <rtems/score/thread.h>
#include <rtems/score/sysstate.h>

/*PAGE
 *
 *  rtems_partition_create
 *
 *  This directive creates a partiton of fixed sized buffers from the
 *  given contiguous memory area.
 *
 *  Input parameters:
 *    name             - user defined partition name
 *    starting_address - physical start address of partition
 *    length           - physical length in bytes
 *    buffer_size      - size of buffers in bytes
 *    attribute_set    - partition attributes
 *    id               - pointer to partition id
 *
 *  Output parameters:
 *    id                - partition id
 *    RTEMS_SUCCESSFUL - if successful
 *    error code        - if unsuccessful
 */

rtems_status_code rtems_partition_create(
  rtems_name          name,
  void               *starting_address,
  unsigned32          length,
  unsigned32          buffer_size,
  rtems_attribute     attribute_set,
  Objects_Id         *id
)
{
  register Partition_Control *the_partition;

  if ( !rtems_is_name_valid( name ) )
    return RTEMS_INVALID_NAME;

  if ( !starting_address )
    return RTEMS_INVALID_ADDRESS;

  if ( !id )
    return RTEMS_INVALID_ADDRESS;

  if ( length == 0 || buffer_size == 0 || length < buffer_size ||
         !_Partition_Is_buffer_size_aligned( buffer_size ) )
    return RTEMS_INVALID_SIZE;

  if ( !_Addresses_Is_aligned( starting_address ) )
     return RTEMS_INVALID_ADDRESS;

#if defined(RTEMS_MULTIPROCESSING)
  if ( _Attributes_Is_global( attribute_set ) && 
       !_System_state_Is_multiprocessing )
    return RTEMS_MP_NOT_CONFIGURED;
#endif

  _Thread_Disable_dispatch();               /* prevents deletion */

  the_partition = _Partition_Allocate();

  if ( !the_partition ) {
    _Thread_Enable_dispatch();
    return RTEMS_TOO_MANY;
  }

#if defined(RTEMS_MULTIPROCESSING)
  if ( _Attributes_Is_global( attribute_set ) &&
       !( _Objects_MP_Allocate_and_open( &_Partition_Information, name,
                            the_partition->Object.id, FALSE ) ) ) {
    _Partition_Free( the_partition );
    _Thread_Enable_dispatch();
    return RTEMS_TOO_MANY;
  }
#endif

  the_partition->starting_address      = starting_address;
  the_partition->length                = length;
  the_partition->buffer_size           = buffer_size;
  the_partition->attribute_set         = attribute_set;
  the_partition->number_of_used_blocks = 0;

  _Chain_Initialize( &the_partition->Memory, starting_address,
                        length / buffer_size, buffer_size );

  _Objects_Open(
    &_Partition_Information,
    &the_partition->Object,
    (Objects_Name) name
  );

  *id = the_partition->Object.id;
#if defined(RTEMS_MULTIPROCESSING)
  if ( _Attributes_Is_global( attribute_set ) )
    _Partition_MP_Send_process_packet(
      PARTITION_MP_ANNOUNCE_CREATE,
      the_partition->Object.id,
      name,
      0                  /* Not used */
    );
#endif

  _Thread_Enable_dispatch();
  return RTEMS_SUCCESSFUL;
}