1 | /** |
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2 | * @file rtems/score/priority.inl |
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3 | * |
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4 | * This file contains the static inline implementation of all inlined |
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5 | * routines in the Priority Handler. |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2004. |
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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.com/license/LICENSE. |
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15 | * |
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16 | * $Id$ |
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17 | */ |
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18 | |
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19 | #ifndef _RTEMS_SCORE_PRIORITY_H |
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20 | # error "Never use <rtems/score/priority.inl> directly; include <rtems/score/priority.h> instead." |
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21 | #endif |
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22 | |
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23 | #ifndef _RTEMS_SCORE_PRIORITY_INL |
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24 | #define _RTEMS_SCORE_PRIORITY_INL |
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25 | |
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26 | /** |
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27 | * @addtogroup ScorePriority |
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28 | * @{ |
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29 | */ |
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30 | |
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31 | #include <rtems/score/bitfield.h> |
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32 | |
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33 | /** |
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34 | * This routine performs the initialization necessary for this handler. |
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35 | */ |
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36 | |
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37 | RTEMS_INLINE_ROUTINE void _Priority_Handler_initialization( void ) |
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38 | { |
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39 | int index; |
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40 | |
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41 | _Priority_Major_bit_map = 0; |
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42 | for ( index=0 ; index <16 ; index++ ) |
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43 | _Priority_Bit_map[ index ] = 0; |
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44 | } |
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45 | |
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46 | /** |
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47 | * This function returns true if the_priority if valid for a |
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48 | * user task, and false otherwise. |
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49 | */ |
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50 | |
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51 | RTEMS_INLINE_ROUTINE bool _Priority_Is_valid ( |
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52 | Priority_Control the_priority |
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53 | ) |
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54 | { |
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55 | /* |
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56 | * Since PRIORITY_MINIMUM is 0 and priorities are stored unsigned, |
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57 | * then checking for less than 0 is unnecessary. |
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58 | */ |
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59 | |
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60 | return ( the_priority <= PRIORITY_MAXIMUM ); |
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61 | } |
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62 | |
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63 | /** |
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64 | * This function returns the major portion of the_priority. |
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65 | */ |
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66 | |
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67 | RTEMS_INLINE_ROUTINE uint32_t _Priority_Major ( |
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68 | Priority_Control the_priority |
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69 | ) |
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70 | { |
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71 | return ( the_priority / 16 ); |
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72 | } |
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73 | |
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74 | /** |
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75 | * This function returns the minor portion of the_priority. |
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76 | */ |
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77 | |
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78 | RTEMS_INLINE_ROUTINE uint32_t _Priority_Minor ( |
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79 | Priority_Control the_priority |
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80 | ) |
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81 | { |
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82 | return ( the_priority % 16 ); |
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83 | } |
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84 | |
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85 | #if ( CPU_USE_GENERIC_BITFIELD_CODE == TRUE ) |
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86 | |
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87 | /** |
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88 | * This function returns the mask associated with the major or minor |
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89 | * number passed to it. |
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90 | */ |
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91 | |
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92 | RTEMS_INLINE_ROUTINE uint32_t _Priority_Mask ( |
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93 | uint32_t bit_number |
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94 | ) |
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95 | { |
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96 | return (0x8000 >> bit_number); |
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97 | } |
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98 | |
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99 | |
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100 | /** |
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101 | * This function translates the bit numbers returned by the bit scan |
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102 | * of a priority bit field into something suitable for use as |
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103 | * a major or minor component of a priority. |
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104 | */ |
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105 | |
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106 | RTEMS_INLINE_ROUTINE uint32_t _Priority_Bits_index ( |
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107 | uint32_t bit_number |
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108 | ) |
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109 | { |
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110 | return bit_number; |
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111 | } |
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112 | |
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113 | #endif |
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114 | |
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115 | /** |
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116 | * This routine uses the_priority_map to update the priority |
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117 | * bit maps to indicate that a thread has been readied. |
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118 | */ |
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119 | |
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120 | RTEMS_INLINE_ROUTINE void _Priority_Add_to_bit_map ( |
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121 | Priority_Information *the_priority_map |
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122 | ) |
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123 | { |
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124 | *the_priority_map->minor |= the_priority_map->ready_minor; |
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125 | _Priority_Major_bit_map |= the_priority_map->ready_major; |
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126 | } |
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127 | |
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128 | /** |
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129 | * This routine uses the_priority_map to update the priority |
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130 | * bit maps to indicate that a thread has been removed from the |
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131 | * ready state. |
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132 | */ |
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133 | |
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134 | RTEMS_INLINE_ROUTINE void _Priority_Remove_from_bit_map ( |
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135 | Priority_Information *the_priority_map |
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136 | ) |
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137 | { |
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138 | *the_priority_map->minor &= the_priority_map->block_minor; |
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139 | if ( *the_priority_map->minor == 0 ) |
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140 | _Priority_Major_bit_map &= the_priority_map->block_major; |
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141 | } |
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142 | |
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143 | /** |
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144 | * This function returns the priority of the highest priority |
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145 | * ready thread. |
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146 | */ |
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147 | |
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148 | RTEMS_INLINE_ROUTINE Priority_Control _Priority_Get_highest( void ) |
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149 | { |
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150 | Priority_Bit_map_control minor; |
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151 | Priority_Bit_map_control major; |
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152 | |
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153 | _Bitfield_Find_first_bit( _Priority_Major_bit_map, major ); |
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154 | _Bitfield_Find_first_bit( _Priority_Bit_map[major], minor ); |
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155 | |
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156 | return (_Priority_Bits_index( major ) << 4) + |
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157 | _Priority_Bits_index( minor ); |
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158 | } |
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159 | |
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160 | /** |
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161 | * This routine initializes the_priority_map so that it |
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162 | * contains the information necessary to manage a thread |
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163 | * at new_priority. |
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164 | */ |
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165 | |
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166 | RTEMS_INLINE_ROUTINE void _Priority_Initialize_information( |
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167 | Priority_Information *the_priority_map, |
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168 | Priority_Control new_priority |
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169 | ) |
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170 | { |
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171 | Priority_Bit_map_control major; |
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172 | Priority_Bit_map_control minor; |
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173 | Priority_Bit_map_control mask; |
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174 | |
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175 | major = _Priority_Major( new_priority ); |
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176 | minor = _Priority_Minor( new_priority ); |
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177 | |
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178 | the_priority_map->minor = |
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179 | &_Priority_Bit_map[ _Priority_Bits_index(major) ]; |
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180 | |
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181 | mask = _Priority_Mask( major ); |
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182 | the_priority_map->ready_major = mask; |
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183 | the_priority_map->block_major = ~mask; |
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184 | |
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185 | mask = _Priority_Mask( minor ); |
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186 | the_priority_map->ready_minor = mask; |
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187 | the_priority_map->block_minor = ~mask; |
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188 | } |
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189 | |
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190 | /** |
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191 | * This function returns true if the priority GROUP is empty, and |
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192 | * false otherwise. |
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193 | */ |
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194 | |
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195 | RTEMS_INLINE_ROUTINE bool _Priority_Is_group_empty ( |
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196 | Priority_Control the_priority |
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197 | ) |
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198 | { |
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199 | return the_priority == 0; |
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200 | } |
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201 | |
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202 | /**@}*/ |
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203 | |
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204 | #endif |
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205 | /* end of include file */ |
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