source: rtems/cpukit/rtems/src/regionextend.c @ 6ccfe72

4.115
Last change on this file since 6ccfe72 was 6ccfe72, checked in by Sebastian Huber <sebastian.huber@…>, on 08/09/12 at 08:17:42

score: Change _Heap_Extend() API

The _Heap_Extend() has now the same signature as _Heap_Initialize().
The 4th parameter is ignored (page size in _Heap_Initialize()).

Add Heap_Area and Heap_Initialization_or_extend_handler.

Add and test _Heap_No_extend().

This helps to do a table based heap initialization and extension.
Create a table of Heap_Area elements and iterate through it. Set the
handler to _Heap_Initialize() in the first iteration and then to
_Heap_Extend().

  • Property mode set to 100644
File size: 2.3 KB
Line 
1/*
2 *  Region Manager - Extend (add memory to) a Region
3 *
4 *  COPYRIGHT (c) 1989-2009.
5 *  On-Line Applications Research Corporation (OAR).
6 *
7 *  The license and distribution terms for this file may be
8 *  found in the file LICENSE in this distribution or at
9 *  http://www.rtems.com/license/LICENSE.
10 */
11
12#if HAVE_CONFIG_H
13#include "config.h"
14#endif
15
16#include <rtems/system.h>
17#include <rtems/rtems/status.h>
18#include <rtems/rtems/support.h>
19#include <rtems/score/object.h>
20#include <rtems/rtems/options.h>
21#include <rtems/rtems/region.h>
22#include <rtems/score/states.h>
23#include <rtems/score/thread.h>
24#include <rtems/score/apimutex.h>
25
26/*
27 *  rtems_region_extend
28 *
29 *  This directive attempts to grow a region of physical contiguous memory area
30 *  from which variable sized segments can be allocated.
31 *
32 *  Input parameters:
33 *    id         - id of region to grow
34 *    start      - starting address of memory area for extension
35 *    length     - physical length in bytes to grow the region
36 *
37 *  Output parameters:
38 *    RTEMS_SUCCESSFUL - if successful
39 *    error code       - if unsuccessful
40 */
41
42rtems_status_code rtems_region_extend(
43  rtems_id   id,
44  void      *starting_address,
45  uintptr_t  length
46)
47{
48  uintptr_t           amount_extended;
49  Objects_Locations   location;
50  rtems_status_code   return_status;
51  Region_Control     *the_region;
52
53  if ( !starting_address )
54    return RTEMS_INVALID_ADDRESS;
55
56  _RTEMS_Lock_allocator();                      /* to prevent deletion */
57
58    the_region = _Region_Get( id, &location );
59    switch ( location ) {
60
61      case OBJECTS_LOCAL:
62
63        amount_extended = _Heap_Extend(
64          &the_region->Memory,
65          starting_address,
66          length,
67          0
68        );
69
70        if ( amount_extended > 0 ) {
71          the_region->length                += amount_extended;
72          the_region->maximum_segment_size  += amount_extended;
73          return_status = RTEMS_SUCCESSFUL;
74        } else {
75          return_status = RTEMS_INVALID_ADDRESS;
76        }
77        break;
78
79#if defined(RTEMS_MULTIPROCESSING)
80      case OBJECTS_REMOTE:        /* this error cannot be returned */
81        break;
82#endif
83
84      case OBJECTS_ERROR:
85      default:
86        return_status = RTEMS_INVALID_ID;
87        break;
88    }
89
90  _RTEMS_Unlock_allocator();
91  return return_status;
92}
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