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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.rtems.com/license/LICENSE.
*
* $Id$
*/
#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 */
}
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