1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Workspace Handler Support |
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5 | * @ingroup RTEMSScoreWorkspace |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2009. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/score/wkspace.h> |
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22 | #include <rtems/score/assert.h> |
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23 | #include <rtems/score/heapimpl.h> |
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24 | #include <rtems/score/interr.h> |
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25 | #include <rtems/score/threadimpl.h> |
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26 | #include <rtems/score/tls.h> |
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27 | #include <rtems/posix/pthread.h> |
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28 | #include <rtems/config.h> |
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29 | #include <rtems/sysinit.h> |
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30 | |
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31 | #include <string.h> |
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32 | |
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33 | /* #define DEBUG_WORKSPACE */ |
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34 | #if defined(DEBUG_WORKSPACE) |
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35 | #include <rtems/bspIo.h> |
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36 | #endif |
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37 | |
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38 | Heap_Control _Workspace_Area; |
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39 | |
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40 | static uintptr_t _Workspace_Space_for_TLS( uintptr_t page_size ) |
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41 | { |
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42 | uintptr_t tls_size; |
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43 | uintptr_t space; |
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44 | |
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45 | tls_size = _TLS_Get_size(); |
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46 | |
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47 | /* |
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48 | * In case we have a non-zero TLS size, then we need a TLS area for each |
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49 | * thread. These areas are allocated from the workspace. Ensure that the |
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50 | * workspace is large enough to fulfill all requests known at configuration |
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51 | * time (so excluding the unlimited option). It is not possible to estimate |
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52 | * the TLS size in the configuration at compile-time. The TLS size is |
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53 | * determined at application link-time. |
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54 | */ |
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55 | if ( tls_size > 0 ) { |
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56 | uintptr_t tls_align = _TLS_Heap_align_up( (uintptr_t) _TLS_Alignment ); |
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57 | uintptr_t tls_alloc = _TLS_Get_allocation_size( tls_size, tls_align ); |
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58 | |
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59 | /* |
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60 | * Memory allocated with an alignment constraint is allocated from the end |
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61 | * of a free block. The last allocation may need one free block of minimum |
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62 | * size. |
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63 | */ |
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64 | space = _Heap_Min_block_size( page_size ); |
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65 | |
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66 | space += _Thread_Initial_thread_count |
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67 | * _Heap_Size_with_overhead( page_size, tls_alloc, tls_align ); |
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68 | } else { |
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69 | space = 0; |
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70 | } |
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71 | |
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72 | return space; |
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73 | } |
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74 | |
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75 | static void _Workspace_Initialize( void ) |
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76 | { |
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77 | _Workspace_Handler_initialization( _Memory_Get(), _Heap_Extend ); |
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78 | } |
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79 | |
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80 | RTEMS_SYSINIT_ITEM( |
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81 | _Workspace_Initialize, |
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82 | RTEMS_SYSINIT_WORKSPACE, |
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83 | RTEMS_SYSINIT_ORDER_MIDDLE |
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84 | ); |
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85 | |
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86 | void _Workspace_Handler_initialization( |
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87 | const Memory_Information *mem, |
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88 | Heap_Initialization_or_extend_handler extend |
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89 | ) |
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90 | { |
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91 | Heap_Initialization_or_extend_handler init_or_extend; |
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92 | uintptr_t remaining; |
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93 | bool do_zero; |
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94 | bool unified; |
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95 | uintptr_t page_size; |
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96 | uintptr_t overhead; |
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97 | size_t i; |
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98 | |
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99 | page_size = CPU_HEAP_ALIGNMENT; |
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100 | remaining = rtems_configuration_get_work_space_size(); |
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101 | remaining += _Workspace_Space_for_TLS( page_size ); |
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102 | |
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103 | init_or_extend = _Heap_Initialize; |
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104 | do_zero = rtems_configuration_get_do_zero_of_workspace(); |
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105 | unified = rtems_configuration_get_unified_work_area(); |
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106 | overhead = _Heap_Area_overhead( page_size ); |
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107 | |
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108 | for ( i = 0; i < _Memory_Get_count( mem ); ++i ) { |
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109 | Memory_Area *area; |
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110 | uintptr_t free_size; |
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111 | |
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112 | area = _Memory_Get_area( mem, i ); |
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113 | free_size = _Memory_Get_free_size( area ); |
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114 | |
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115 | if ( do_zero ) { |
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116 | memset( _Memory_Get_free_begin( area ), 0, free_size ); |
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117 | } |
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118 | |
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119 | if ( free_size > overhead ) { |
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120 | uintptr_t space_available; |
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121 | uintptr_t size; |
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122 | |
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123 | if ( unified ) { |
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124 | size = free_size; |
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125 | } else { |
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126 | if ( remaining > 0 ) { |
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127 | size = remaining < free_size - overhead ? |
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128 | remaining + overhead : free_size; |
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129 | } else { |
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130 | size = 0; |
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131 | } |
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132 | } |
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133 | |
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134 | space_available = ( *init_or_extend )( |
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135 | &_Workspace_Area, |
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136 | _Memory_Get_free_begin( area ), |
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137 | size, |
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138 | page_size |
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139 | ); |
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140 | |
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141 | _Memory_Consume( area, size ); |
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142 | |
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143 | if ( space_available < remaining ) { |
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144 | remaining -= space_available; |
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145 | } else { |
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146 | remaining = 0; |
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147 | } |
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148 | |
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149 | init_or_extend = extend; |
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150 | } |
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151 | } |
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152 | |
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153 | if ( remaining > 0 ) { |
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154 | _Internal_error( INTERNAL_ERROR_TOO_LITTLE_WORKSPACE ); |
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155 | } |
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156 | |
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157 | _Heap_Protection_set_delayed_free_fraction( &_Workspace_Area, 1 ); |
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158 | } |
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159 | |
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160 | void *_Workspace_Allocate( |
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161 | size_t size |
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162 | ) |
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163 | { |
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164 | void *memory; |
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165 | |
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166 | memory = _Heap_Allocate( &_Workspace_Area, size ); |
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167 | #if defined(DEBUG_WORKSPACE) |
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168 | printk( |
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169 | "Workspace_Allocate(%d) from %p/%p -> %p\n", |
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170 | size, |
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171 | __builtin_return_address( 0 ), |
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172 | __builtin_return_address( 1 ), |
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173 | memory |
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174 | ); |
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175 | #endif |
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176 | return memory; |
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177 | } |
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178 | |
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179 | void *_Workspace_Allocate_aligned( size_t size, size_t alignment ) |
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180 | { |
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181 | return _Heap_Allocate_aligned( &_Workspace_Area, size, alignment ); |
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182 | } |
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183 | |
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184 | /* |
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185 | * _Workspace_Free |
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186 | */ |
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187 | void _Workspace_Free( |
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188 | void *block |
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189 | ) |
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190 | { |
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191 | #if defined(DEBUG_WORKSPACE) |
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192 | printk( |
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193 | "Workspace_Free(%p) from %p/%p\n", |
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194 | block, |
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195 | __builtin_return_address( 0 ), |
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196 | __builtin_return_address( 1 ) |
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197 | ); |
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198 | #endif |
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199 | _Heap_Free( &_Workspace_Area, block ); |
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200 | } |
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