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/*
* Heap Handler
*
* 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.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/score/sysstate.h>
#include <rtems/score/heap.h>
/*PAGE
*
* _Heap_Size_of_user_area
*
* This kernel routine sets '*size' to the size of the block of memory
* which begins at 'starting_address'.
* It returns TRUE if the 'starting_address' is in the heap, and FALSE
* otherwise.
*
* Input parameters:
* the_heap - pointer to heap header
* starting_address - starting address of the memory block
* size - pointer to size of area
*
* Output parameters:
* size - size of area filled in
* TRUE - if starting_address is valid heap address
* FALSE - if starting_address is invalid heap address
*/
boolean _Heap_Size_of_user_area(
Heap_Control *the_heap,
void *starting_address,
size_t *size
)
{
Heap_Block *the_block;
Heap_Block *next_block;
uint32_t the_size;
if ( !_Addresses_Is_in_range(
starting_address, (void *)the_heap->start, (void *)the_heap->final ) )
return( FALSE );
_Heap_Start_of_block( the_heap, starting_address, &the_block );
if ( !_Heap_Is_block_in( the_heap, the_block ) )
return( FALSE );
the_size = _Heap_Block_size( the_block );
next_block = _Heap_Block_at( the_block, the_size );
if (
!_Heap_Is_block_in( the_heap, next_block ) ||
!_Heap_Is_prev_used( next_block )
)
return( FALSE );
/* 'starting_address' could be greater than 'the_block' address plus
HEAP_BLOCK_USER_OFFSET as _Heap_Allocate_aligned() may produce such user
pointers. To get rid of this offset we calculate user size as difference
between the end of 'the_block' (='next_block') and 'starting_address'
and then add correction equal to the offset of the 'size' field of the
'Heap_Block' structure. The correction is due to the fact that
'prev_size' field of the next block is actually used as user accessible
area of 'the_block'. */
*size = _Addresses_Subtract ( next_block, starting_address )
+ HEAP_BLOCK_HEADER_OFFSET;
return( TRUE );
}
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