1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Malloc initialization implementation. |
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5 | */ |
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6 | |
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7 | /* |
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8 | * COPYRIGHT (c) 1989-2007. |
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9 | * On-Line Applications Research Corporation (OAR). |
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10 | * |
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11 | * The license and distribution terms for this file may be |
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12 | * found in the file LICENSE in this distribution or at |
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13 | * http://www.rtems.com/license/LICENSE. |
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14 | * |
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15 | * $Id$ |
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16 | */ |
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17 | |
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18 | #if HAVE_CONFIG_H |
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19 | #include "config.h" |
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20 | #endif |
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21 | |
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22 | #include <rtems.h> |
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23 | #include <rtems/malloc.h> |
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24 | #include <rtems/score/wkspace.h> |
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25 | #include "malloc_p.h" |
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26 | |
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27 | /* FIXME: Dummy function */ |
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28 | #ifndef RTEMS_NEWLIB |
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29 | void RTEMS_Malloc_Initialize( |
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30 | void *heap_begin, |
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31 | uintptr_t heap_size, |
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32 | size_t sbrk_amount |
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33 | ) |
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34 | { |
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35 | } |
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36 | #else |
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37 | rtems_malloc_statistics_t rtems_malloc_statistics; |
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38 | extern bool rtems_unified_work_area; |
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39 | |
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40 | void RTEMS_Malloc_Initialize( |
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41 | void *heap_begin, |
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42 | uintptr_t heap_size, |
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43 | size_t sbrk_amount |
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44 | ) |
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45 | { |
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46 | /* |
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47 | * If configured, initialize the statistics support |
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48 | */ |
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49 | if ( rtems_malloc_statistics_helpers != NULL ) { |
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50 | (*rtems_malloc_statistics_helpers->initialize)(); |
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51 | } |
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52 | |
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53 | /* |
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54 | * Initialize the garbage collection list to start with nothing on it. |
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55 | */ |
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56 | malloc_deferred_frees_initialize(); |
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57 | |
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58 | /* |
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59 | * Initialize the optional sbrk support for extending the heap |
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60 | */ |
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61 | if ( rtems_malloc_sbrk_helpers != NULL ) { |
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62 | void *new_heap_begin = (*rtems_malloc_sbrk_helpers->initialize)( |
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63 | heap_begin, |
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64 | sbrk_amount |
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65 | ); |
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66 | |
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67 | heap_size -= (uintptr_t) new_heap_begin - (uintptr_t) heap_begin; |
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68 | heap_begin = new_heap_begin; |
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69 | } |
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70 | |
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71 | /* |
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72 | * If this system is configured to use the same heap for |
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73 | * the RTEMS Workspace and C Program Heap, then we need to |
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74 | * be very very careful about destroying the initialization |
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75 | * that has already been done. |
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76 | */ |
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77 | |
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78 | /* |
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79 | * If the BSP is not clearing out the workspace, then it is most likely |
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80 | * not clearing out the initial memory for the heap. There is no |
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81 | * standard supporting zeroing out the heap memory. But much code |
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82 | * with UNIX history seems to assume that memory malloc'ed during |
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83 | * initialization (before any free's) is zero'ed. This is true most |
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84 | * of the time under UNIX because zero'ing memory when it is first |
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85 | * given to a process eliminates the chance of a process seeing data |
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86 | * left over from another process. This would be a security violation. |
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87 | */ |
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88 | |
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89 | if ( |
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90 | !rtems_unified_work_area |
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91 | && rtems_configuration_get_do_zero_of_workspace() |
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92 | ) { |
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93 | memset( heap_begin, 0, heap_size ); |
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94 | } |
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95 | |
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96 | /* |
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97 | * Unfortunately we cannot use assert if this fails because if this |
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98 | * has failed we do not have a heap and if we do not have a heap |
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99 | * STDIO cannot work because there will be no buffers. |
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100 | */ |
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101 | |
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102 | if ( !rtems_unified_work_area ) { |
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103 | uintptr_t status = _Protected_heap_Initialize( |
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104 | RTEMS_Malloc_Heap, |
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105 | heap_begin, |
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106 | heap_size, |
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107 | CPU_HEAP_ALIGNMENT |
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108 | ); |
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109 | if ( status == 0 ) { |
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110 | rtems_fatal_error_occurred( RTEMS_NO_MEMORY ); |
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111 | } |
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112 | } |
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113 | |
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114 | MSBUMP( space_available, _Protected_heap_Get_size(RTEMS_Malloc_Heap) ); |
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115 | |
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116 | #if defined(RTEMS_HEAP_DEBUG) |
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117 | if ( _Protected_heap_Walk( RTEMS_Malloc_Heap, 0, false ) ) { |
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118 | printk( "Malloc heap not initialized correctly\n" ); |
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119 | rtems_print_buffer( heap_begin, 32 ); |
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120 | printk( "\n" ); |
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121 | rtems_print_buffer( (heap_begin + heap_size) - 48, 48 ); |
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122 | rtems_fatal_error_occurred( RTEMS_NO_MEMORY ); |
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123 | } |
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124 | #endif |
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125 | } |
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126 | #endif |
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