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_create |
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27 | * |
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28 | * This directive creates 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 | * name - user defined region name |
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33 | * starting_address - physical start address of region |
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34 | * length - physical length in bytes |
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35 | * page_size - page size in bytes |
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36 | * attribute_set - region attributes |
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37 | * id - address of region id to set |
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38 | * |
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39 | * Output parameters: |
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40 | * id - region id |
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41 | * RTEMS_SUCCESSFUL - if successful |
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42 | * error code - if unsuccessful |
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43 | */ |
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44 | |
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45 | rtems_status_code rtems_region_create( |
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46 | rtems_name name, |
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47 | void *starting_address, |
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48 | unsigned32 length, |
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49 | unsigned32 page_size, |
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50 | rtems_attribute attribute_set, |
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51 | Objects_Id *id |
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52 | ) |
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53 | { |
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54 | Region_Control *the_region; |
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55 | |
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56 | if ( !rtems_is_name_valid( name ) ) |
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57 | return RTEMS_INVALID_NAME; |
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58 | |
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59 | if ( !_Addresses_Is_aligned( starting_address ) ) |
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60 | return RTEMS_INVALID_ADDRESS; |
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61 | |
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62 | _Thread_Disable_dispatch(); /* to prevent deletion */ |
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63 | |
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64 | the_region = _Region_Allocate(); |
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65 | |
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66 | if ( !the_region ) { |
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67 | _Thread_Enable_dispatch(); |
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68 | return RTEMS_TOO_MANY; |
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69 | } |
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70 | |
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71 | the_region->maximum_segment_size = |
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72 | _Heap_Initialize(&the_region->Memory, starting_address, length, page_size); |
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73 | |
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74 | if ( !the_region->maximum_segment_size ) { |
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75 | _Region_Free( the_region ); |
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76 | _Thread_Enable_dispatch(); |
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77 | return RTEMS_INVALID_SIZE; |
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78 | } |
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79 | |
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80 | the_region->starting_address = starting_address; |
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81 | the_region->length = length; |
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82 | the_region->page_size = page_size; |
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83 | the_region->attribute_set = attribute_set; |
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84 | the_region->number_of_used_blocks = 0; |
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85 | |
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86 | _Thread_queue_Initialize( |
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87 | &the_region->Wait_queue, |
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88 | OBJECTS_RTEMS_REGIONS, |
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89 | _Attributes_Is_priority( attribute_set ) ? |
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90 | THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO, |
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91 | STATES_WAITING_FOR_SEGMENT, |
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92 | #if defined(RTEMS_MULTIPROCESSING) |
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93 | _Region_MP_Send_extract_proxy, |
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94 | #else |
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95 | NULL, |
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96 | #endif |
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97 | RTEMS_TIMEOUT |
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98 | ); |
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99 | |
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100 | _Objects_Open( &_Region_Information, &the_region->Object, &name ); |
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101 | |
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102 | *id = the_region->Object.id; |
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103 | _Thread_Enable_dispatch(); |
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104 | return RTEMS_SUCCESSFUL; |
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105 | } |
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