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/**
* @file
*
* @brief rtems_region_create
* @ingroup ClassicRegion Regions
*/
/*
* 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.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/regionimpl.h>
#include <rtems/rtems/attrimpl.h>
#include <rtems/rtems/support.h>
#include <rtems/score/apimutex.h>
#include <rtems/score/statesimpl.h>
#include <rtems/score/threadqimpl.h>
/*
* 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,
uintptr_t length,
uintptr_t page_size,
rtems_attribute attribute_set,
rtems_id *id
)
{
rtems_status_code return_status;
Region_Control *the_region;
if ( !rtems_is_name_valid( name ) )
return RTEMS_INVALID_NAME;
if ( !starting_address )
return RTEMS_INVALID_ADDRESS;
if ( !id )
return RTEMS_INVALID_ADDRESS;
_RTEMS_Lock_allocator(); /* to prevent deletion */
the_region = _Region_Allocate();
if ( !the_region )
return_status = RTEMS_TOO_MANY;
else {
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 );
return_status = RTEMS_INVALID_SIZE;
}
else {
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,
(Objects_Name) name
);
*id = the_region->Object.id;
return_status = RTEMS_SUCCESSFUL;
}
}
_RTEMS_Unlock_allocator();
return return_status;
}
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