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