1 | /* |
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2 | * RTEMS Malloc Family Implementation --Initialization |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989-2007. |
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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.rtems.com/license/LICENSE. |
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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 | #if HAVE_CONFIG_H |
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16 | #include "config.h" |
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17 | #endif |
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18 | |
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19 | #include <rtems.h> |
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20 | #include <rtems/malloc.h> |
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21 | #include "malloc_p.h" |
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22 | |
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23 | Heap_Control RTEMS_Malloc_Heap; |
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24 | rtems_malloc_statistics_t rtems_malloc_statistics; |
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25 | |
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26 | void RTEMS_Malloc_Initialize( |
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27 | void *start, |
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28 | size_t length, |
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29 | size_t sbrk_amount |
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30 | ) |
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31 | { |
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32 | uint32_t status; |
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33 | void *starting_address; |
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34 | |
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35 | #if defined(RTEMS_MALLOC_BOUNDARY_HELPERS) |
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36 | /* |
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37 | * If configured, initialize the boundary support |
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38 | */ |
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39 | if (rtems_malloc_boundary_helpers) |
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40 | (*rtems_malloc_boundary_helpers->initialize)(); |
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41 | #endif |
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42 | |
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43 | /* |
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44 | * If configured, initialize the statistics support |
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45 | */ |
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46 | if ( rtems_malloc_statistics_helpers ) |
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47 | (*rtems_malloc_statistics_helpers->initialize)(); |
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48 | |
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49 | /* |
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50 | * Initialize the garbage collection list to start with nothing on it. |
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51 | */ |
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52 | malloc_deferred_frees_initialize(); |
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53 | |
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54 | starting_address = start; |
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55 | |
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56 | /* |
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57 | * Initialize the optional sbrk support for extending the heap |
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58 | */ |
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59 | if (rtems_malloc_sbrk_helpers) { |
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60 | starting_address = (*rtems_malloc_sbrk_helpers->initialize)( |
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61 | start, |
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62 | sbrk_amount |
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63 | ); |
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64 | } |
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65 | |
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66 | /* |
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67 | * If the BSP is not clearing out the workspace, then it is most likely |
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68 | * not clearing out the initial memory for the heap. There is no |
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69 | * standard supporting zeroing out the heap memory. But much code |
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70 | * with UNIX history seems to assume that memory malloc'ed during |
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71 | * initialization (before any free's) is zero'ed. This is true most |
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72 | * of the time under UNIX because zero'ing memory when it is first |
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73 | * given to a process eliminates the chance of a process seeing data |
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74 | * left over from another process. This would be a security violation. |
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75 | */ |
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76 | |
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77 | if ( rtems_configuration_get_do_zero_of_workspace() ) |
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78 | memset( starting_address, 0, length ); |
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79 | |
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80 | /* |
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81 | * Unfortunately we cannot use assert if this fails because if this |
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82 | * has failed we do not have a heap and if we do not have a heap |
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83 | * STDIO cannot work because there will be no buffers. |
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84 | */ |
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85 | |
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86 | status = _Protected_heap_Initialize( |
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87 | &RTEMS_Malloc_Heap, |
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88 | starting_address, |
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89 | length, |
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90 | CPU_HEAP_ALIGNMENT |
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91 | ); |
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92 | if ( !status ) |
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93 | rtems_fatal_error_occurred( status ); |
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94 | |
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95 | #if defined(RTEMS_HEAP_DEBUG) |
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96 | if ( _Protected_heap_Walk( &RTEMS_Malloc_Heap, 0, FALSE ) ) { |
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97 | printk( "Malloc heap not initialized correctly\n" ); |
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98 | rtems_print_buffer( start, 32 ); |
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99 | printk( "\n" ); |
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100 | rtems_print_buffer( (start + length) - 48, 48 ); |
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101 | rtems_fatal_error_occurred( RTEMS_NO_MEMORY ); |
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102 | } |
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103 | #endif |
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104 | |
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105 | MSBUMP(space_available, length); |
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106 | } |
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