1 | /* |
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2 | * |
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3 | * COPYRIGHT (c) 1989-1999. |
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4 | * On-Line Applications Research Corporation (OAR). |
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5 | * |
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6 | * The license and distribution terms for this file may be |
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7 | * found in the file LICENSE in this distribution or at |
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8 | * http://www.OARcorp.com/rtems/license.html. |
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9 | * |
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10 | * $Id$ |
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11 | */ |
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12 | |
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13 | /* |
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14 | * WARNING!!!!!!!!! |
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15 | * |
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16 | * THIS TEST USES INTERNAL RTEMS VARIABLES!!! |
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17 | */ |
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18 | |
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19 | #define TEST_INIT |
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20 | #include "system.h" |
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21 | |
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22 | #include <bsp.h> |
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23 | |
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24 | rtems_task Task_1( |
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25 | rtems_task_argument argument |
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26 | ); |
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27 | |
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28 | rtems_task Task_2( |
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29 | rtems_task_argument argument |
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30 | ); |
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31 | |
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32 | volatile rtems_unsigned32 Interrupt_occurred; |
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33 | volatile rtems_unsigned32 Interrupt_enter_time, Interrupt_enter_nested_time; |
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34 | volatile rtems_unsigned32 Interrupt_return_time, Interrupt_return_nested_time; |
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35 | rtems_unsigned32 Interrupt_nest; |
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36 | |
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37 | rtems_isr Isr_handler( |
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38 | rtems_vector_number vector |
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39 | ); |
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40 | |
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41 | rtems_task Init( |
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42 | rtems_task_argument argument |
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43 | ) |
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44 | { |
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45 | rtems_status_code status; |
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46 | |
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47 | Print_Warning(); |
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48 | |
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49 | puts( "\n\n*** TIME TEST 27 ***" ); |
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50 | |
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51 | status = rtems_task_create( |
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52 | rtems_build_name( 'T', 'A', '1', ' ' ), |
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53 | 254, |
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54 | RTEMS_MINIMUM_STACK_SIZE, |
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55 | RTEMS_DEFAULT_MODES, |
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56 | RTEMS_DEFAULT_ATTRIBUTES, |
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57 | &Task_id[ 1 ] |
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58 | ); |
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59 | directive_failed( status, "rtems_task_create Task_1" ); |
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60 | |
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61 | status = rtems_task_start( Task_id[ 1 ], Task_1, 0 ); |
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62 | directive_failed( status, "rtems_task_start Task_1" ); |
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63 | |
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64 | status = rtems_task_create( |
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65 | rtems_build_name( 'T', 'A', '2', ' ' ), |
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66 | 254, |
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67 | RTEMS_MINIMUM_STACK_SIZE, |
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68 | RTEMS_DEFAULT_MODES, |
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69 | RTEMS_DEFAULT_ATTRIBUTES, |
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70 | &Task_id[ 2 ] |
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71 | ); |
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72 | directive_failed( status, "rtems_task_create of Task_2" ); |
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73 | |
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74 | status = rtems_task_start( Task_id[ 2 ], Task_2, 0 ); |
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75 | directive_failed( status, "rtems_task_start of Task_2" ); |
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76 | |
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77 | status = rtems_task_delete( RTEMS_SELF ); |
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78 | directive_failed( status, "rtems_task_delete of RTEMS_SELF" ); |
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79 | } |
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80 | |
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81 | rtems_task Task_1( |
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82 | rtems_task_argument argument |
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83 | ) |
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84 | { |
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85 | Install_tm27_vector( Isr_handler ); |
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86 | |
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87 | /* |
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88 | * No preempt .. no nesting |
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89 | */ |
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90 | |
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91 | Interrupt_nest = 0; |
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92 | |
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93 | _Thread_Dispatch_disable_level = 0; |
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94 | |
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95 | Interrupt_occurred = 0; |
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96 | Timer_initialize(); |
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97 | Cause_tm27_intr(); |
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98 | /* goes to Isr_handler */ |
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99 | |
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100 | #if (MUST_WAIT_FOR_INTERRUPT == 1) |
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101 | while ( Interrupt_occurred == 0 ); |
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102 | #endif |
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103 | Interrupt_return_time = Read_timer(); |
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104 | |
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105 | put_time( |
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106 | "interrupt entry overhead: returns to interrupted task", |
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107 | Interrupt_enter_time, |
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108 | 1, |
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109 | 0, |
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110 | 0 |
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111 | ); |
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112 | |
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113 | put_time( |
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114 | "interrupt exit overhead: returns to interrupted task", |
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115 | Interrupt_return_time, |
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116 | 1, |
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117 | 0, |
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118 | 0 |
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119 | ); |
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120 | |
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121 | /* |
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122 | * No preempt .. nested |
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123 | */ |
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124 | |
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125 | _Thread_Dispatch_disable_level = 1; |
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126 | |
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127 | Interrupt_nest = 1; |
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128 | |
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129 | Interrupt_occurred = 0; |
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130 | Timer_initialize(); |
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131 | Cause_tm27_intr(); |
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132 | /* goes to Isr_handler */ |
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133 | |
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134 | #if (MUST_WAIT_FOR_INTERRUPT == 1) |
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135 | while ( Interrupt_occurred == 0 ); |
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136 | #endif |
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137 | Interrupt_return_time = Read_timer(); |
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138 | |
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139 | put_time( |
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140 | "interrupt entry overhead: returns to nested interrupt", |
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141 | Interrupt_enter_nested_time, |
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142 | 1, |
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143 | 0, |
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144 | 0 |
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145 | ); |
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146 | |
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147 | put_time( |
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148 | "interrupt exit overhead: returns to nested interrupt", |
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149 | Interrupt_return_nested_time, |
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150 | 1, |
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151 | 0, |
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152 | 0 |
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153 | ); |
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154 | |
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155 | /* |
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156 | * Does a preempt .. not nested |
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157 | */ |
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158 | |
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159 | _Thread_Dispatch_disable_level = 0; |
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160 | |
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161 | _Thread_Heir = (rtems_tcb *) _Thread_Ready_chain[254].last; |
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162 | |
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163 | _Context_Switch_necessary = 1; |
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164 | |
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165 | Interrupt_occurred = 0; |
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166 | Timer_initialize(); |
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167 | Cause_tm27_intr(); |
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168 | |
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169 | /* |
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170 | * goes to Isr_handler and then returns |
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171 | */ |
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172 | |
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173 | puts( "*** END OF TEST 27 ***" ); |
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174 | exit( 0 ); |
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175 | } |
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176 | |
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177 | /* |
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178 | * NOTE: When this task is executing, some of the assumptions made |
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179 | * regarding the placement of the currently executing task's TCB |
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180 | * on the ready chains have been violated. At least the assumption |
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181 | * that this task is at the head of the chain for its priority |
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182 | * has been violated. |
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183 | */ |
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184 | |
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185 | rtems_task Task_2( |
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186 | rtems_task_argument argument |
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187 | ) |
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188 | { |
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189 | #if (MUST_WAIT_FOR_INTERRUPT == 1) |
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190 | while ( Interrupt_occurred == 0 ); |
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191 | #endif |
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192 | end_time = Read_timer(); |
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193 | |
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194 | put_time( |
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195 | "interrupt entry overhead: returns to preempting task", |
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196 | Interrupt_enter_time, |
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197 | 1, |
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198 | 0, |
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199 | 0 |
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200 | ); |
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201 | |
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202 | put_time( |
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203 | "interrupt exit overhead: returns to preempting task", |
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204 | end_time, |
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205 | 1, |
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206 | 0, |
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207 | 0 |
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208 | ); |
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209 | |
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210 | fflush( stdout ); |
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211 | |
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212 | /* |
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213 | * Switch back to the other task to exit the test. |
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214 | */ |
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215 | |
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216 | _Thread_Dispatch_disable_level = 0; |
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217 | |
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218 | _Thread_Heir = (rtems_tcb *) _Thread_Ready_chain[254].first; |
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219 | |
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220 | _Context_Switch_necessary = 1; |
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221 | |
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222 | _Thread_Dispatch(); |
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223 | |
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224 | } |
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225 | |
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226 | /* The Isr_handler() and Isr_handler_inner() routines are structured |
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227 | * so that there will be as little entry overhead as possible included |
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228 | * in the interrupt entry time. |
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229 | */ |
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230 | |
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231 | void Isr_handler_inner( void ); |
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232 | |
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233 | rtems_isr Isr_handler( |
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234 | rtems_vector_number vector |
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235 | ) |
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236 | { |
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237 | end_time = Read_timer(); |
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238 | |
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239 | Interrupt_occurred = 1; |
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240 | Isr_handler_inner(); |
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241 | } |
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242 | |
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243 | void Isr_handler_inner( void ) |
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244 | { |
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245 | |
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246 | /*enable_tracing();*/ |
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247 | Clear_tm27_intr(); |
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248 | switch ( Interrupt_nest ) { |
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249 | case 0: |
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250 | Interrupt_enter_time = end_time; |
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251 | break; |
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252 | case 1: |
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253 | Interrupt_enter_time = end_time; |
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254 | Interrupt_nest = 2; |
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255 | Interrupt_occurred = 0; |
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256 | Lower_tm27_intr(); |
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257 | Timer_initialize(); |
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258 | Cause_tm27_intr(); |
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259 | /* goes to a nested copy of Isr_handler */ |
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260 | #if (MUST_WAIT_FOR_INTERRUPT == 1) |
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261 | while ( Interrupt_occurred == 0 ); |
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262 | #endif |
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263 | Interrupt_return_nested_time = Read_timer(); |
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264 | break; |
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265 | case 2: |
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266 | Interrupt_enter_nested_time = end_time; |
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267 | break; |
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268 | } |
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269 | |
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270 | Timer_initialize(); |
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271 | } |
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