source: rtems/cpukit/rtems/src/regionextend.c @ 4bf1801

4.104.114.84.95
Last change on this file since 4bf1801 was 08311cc3, checked in by Joel Sherrill <joel.sherrill@…>, on 11/17/99 at 17:51:34

Updated copyright notice.

  • Property mode set to 100644
File size: 2.3 KB
Line 
1/*
2 *  Region Manager
3 *
4 *
5 *  COPYRIGHT (c) 1989-1999.
6 *  On-Line Applications Research Corporation (OAR).
7 *
8 *  The license and distribution terms for this file may be
9 *  found in the file LICENSE in this distribution or at
10 *  http://www.OARcorp.com/rtems/license.html.
11 *
12 *  $Id$
13 */
14
15#include <rtems/system.h>
16#include <rtems/rtems/status.h>
17#include <rtems/rtems/support.h>
18#include <rtems/score/object.h>
19#include <rtems/rtems/options.h>
20#include <rtems/rtems/region.h>
21#include <rtems/score/states.h>
22#include <rtems/score/thread.h>
23
24/*PAGE
25 *
26 *  rtems_region_extend
27 *
28 *  This directive attempts to grow a region of physical contiguous memory area
29 *  from which variable sized segments can be allocated.
30 *
31 *  Input parameters:
32 *    id         - id of region to grow
33 *    start      - starting address of memory area for extension
34 *    length     - physical length in bytes to grow the region
35 *
36 *  Output parameters:
37 *    RTEMS_SUCCESSFUL - if successful
38 *    error code       - if unsuccessful
39 */
40
41rtems_status_code rtems_region_extend(
42  Objects_Id          id,
43  void               *starting_address,
44  unsigned32          length
45)
46{
47  Region_Control     *the_region;
48  Objects_Locations   location;
49  unsigned32          amount_extended;
50  Heap_Extend_status  heap_status;
51  rtems_status_code   status;
52
53  status = RTEMS_SUCCESSFUL;
54
55  the_region = _Region_Get( id, &location );
56  switch ( location ) {
57    case OBJECTS_REMOTE:        /* this error cannot be returned */
58      return RTEMS_INTERNAL_ERROR;
59
60    case OBJECTS_ERROR:
61      return RTEMS_INVALID_ID;
62
63    case OBJECTS_LOCAL:
64
65      heap_status = _Heap_Extend(
66        &the_region->Memory,
67        starting_address,
68        length,
69        &amount_extended
70      );
71
72      switch ( heap_status ) {
73        case HEAP_EXTEND_SUCCESSFUL:
74          the_region->length                += amount_extended;
75          the_region->maximum_segment_size  += amount_extended;
76          break;
77        case HEAP_EXTEND_ERROR:
78          status = RTEMS_INVALID_ADDRESS;
79          break;
80        case HEAP_EXTEND_NOT_IMPLEMENTED:
81          status = RTEMS_NOT_IMPLEMENTED;
82          break;
83      }
84      _Thread_Enable_dispatch();
85      return( status );
86  }
87
88  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
89}
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