1 | /* |
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2 | * Simple test program to demonstrate priority inversion when blocking |
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3 | * |
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4 | -Ulf Ivraeus ------------- --- -- - - - |
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5 | * Saab Ericsson Space AB |
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6 | * phone: +46 (0)31 735 4542 |
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7 | * e-mail: ulf.ivraeus@space.se |
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8 | * ----------------------------- --- -- - - - |
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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 | |
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15 | Semaphore Ids: |
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16 | Sync Mutex Id = 0x18010009 |
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17 | Local Mutex Id = 0x1801000a |
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18 | Remote Mutex Id = 0x1801000b |
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19 | |
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20 | Task Ids: |
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21 | TaMedium[0] Id = 0x08010002 |
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22 | TaMedium[1] Id = 0x08010003 |
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23 | TaMedium[2] Id = 0x08010004 |
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24 | TaHigh Id = 0x08010005 |
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25 | TaLow Id = 0x08010006 |
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26 | TaHwSim Id = 0x08010007 |
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27 | |
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28 | ********************************************************************/ |
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29 | |
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30 | /********************************************************************/ |
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31 | /* define this to use the RTEMS 4.5 scheme for object names */ |
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32 | /* #define TEST_ON_RTEMS_45 */ |
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33 | |
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34 | /* define this to print the Id of the calling task */ |
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35 | /* #define TEST_ON_TASK_ID */ |
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36 | |
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37 | /* define this to print statistics when acquiring the mutex */ |
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38 | /* #define TEST_PRINT_STATISTICS */ |
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39 | |
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40 | /* define this if you are (1) on a ERC32 and (2) want a SW ISR trigger */ |
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41 | #if defined(__sparc__) |
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42 | /* #define TEST_USE_ISR */ |
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43 | #endif |
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44 | |
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45 | /* define this if you want the test to exit */ |
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46 | #define TEST_EXIT_AFTER_ITERATIONS 10 |
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47 | /********************************************************************/ |
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48 | |
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49 | #define CONFIGURE_INIT |
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50 | |
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51 | #include <bsp.h> |
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52 | #include <stdio.h> |
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53 | #include "tmacros.h" |
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54 | |
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55 | #if defined(TEST_EXIT_AFTER_ITERATIONS) |
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56 | volatile uint32_t Iterations = 0; |
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57 | #endif |
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58 | |
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59 | /* Task entry point prototypes */ |
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60 | rtems_task Medium_Exec(rtems_task_argument TaskArg); |
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61 | rtems_task Low_Exec(rtems_task_argument TaskArg); |
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62 | rtems_task High_Exec(rtems_task_argument TaskArg); |
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63 | rtems_task LocalHwSim_Exec(rtems_task_argument TaskArg); |
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64 | |
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65 | /* ISR that signals that HW has completed */ |
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66 | rtems_isr LocalHwIsr(/*in*/ rtems_vector_number Vector); |
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67 | |
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68 | /* Test driver functions */ |
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69 | void AccessLocalHw(void); |
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70 | void AccessRemoteHw(void); |
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71 | |
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72 | const char *CallerName() |
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73 | { |
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74 | static char buffer[32]; |
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75 | #if defined(TEST_PRINT_TASK_ID) |
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76 | sprintf( buffer, "0x%08x -- %d", |
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77 | rtems_task_self(), _Thread_Executing->current_priority ); |
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78 | #else |
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79 | union { |
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80 | uint32_t u; |
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81 | unsigned char c[4]; |
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82 | } TempName; |
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83 | |
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84 | #if defined(TEST_ON_RTEMS_45) |
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85 | TempName.u = *(uint32_t *)_Thread_Executing->Object.name; |
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86 | #else |
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87 | TempName.u = (uint32_t) _Thread_Executing->Object.name.name_u32; |
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88 | #endif |
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89 | sprintf( buffer, "%c%c%c%c -- %d", |
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90 | TempName.c[0], TempName.c[1], TempName.c[2], TempName.c[3], |
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91 | _Thread_Executing->current_priority |
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92 | ); |
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93 | #endif |
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94 | return buffer; |
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95 | } |
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96 | |
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97 | #define NofMediumTask_C 3 |
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98 | |
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99 | /* RTEMS identifiers */ |
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100 | rtems_id TaMedium[NofMediumTask_C]; /* Medium-prio tasks accessing */ |
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101 | /* the common local HW */ |
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102 | rtems_id TaHwSim; /* HW simulator */ |
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103 | rtems_id TaLow; /* Low-prio task accessing common */ |
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104 | /* remote HW */ |
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105 | rtems_id TaHigh; /* High-prio task accessing common */ |
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106 | /* remote HW */ |
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107 | |
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108 | |
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109 | rtems_id LocalHwSync_S; /* Syncrhonize task to local HW */ |
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110 | rtems_id LocalHwAccess_R; /* Execlusive access to the local HW */ |
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111 | rtems_id RemoteHwAccess_R; /* Execlusive access to the remote HW */ |
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112 | |
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113 | |
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114 | /* The following variable triggers simulated HW activity */ |
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115 | volatile bool StartHw = false; |
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116 | |
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117 | rtems_task Medium_Exec(rtems_task_argument TaskArg) |
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118 | { |
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119 | printf("Medium_Exec (%d) begins...\n", TaskArg); |
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120 | |
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121 | rtems_task_wake_after(50); |
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122 | |
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123 | while(1) { |
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124 | AccessLocalHw(); |
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125 | } |
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126 | |
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127 | /* JRS - task does not get here */ |
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128 | |
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129 | printf("Medium_Exec (%d) ends...\n", TaskArg); |
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130 | while(1) { |
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131 | rtems_task_wake_after(10000); |
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132 | } |
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133 | } |
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134 | |
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135 | rtems_task High_Exec(rtems_task_argument TaskArg) |
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136 | { |
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137 | printf("High_Exec (%d) begins...\n", TaskArg); |
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138 | |
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139 | /* Delay more than the Low-prio task so that Remote HW access resource is |
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140 | * taken before call to AccesRemoteHw. |
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141 | */ |
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142 | rtems_task_wake_after(250); |
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143 | |
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144 | while(1) { |
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145 | AccessRemoteHw(); |
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146 | } |
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147 | |
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148 | /* JRS - task does not get here */ |
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149 | |
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150 | printf("High_Exec (%d) ends...\n", TaskArg); |
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151 | while(1) { |
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152 | rtems_task_wake_after(10000); |
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153 | } |
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154 | /* task does not get here */ |
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155 | } |
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156 | |
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157 | rtems_task Low_Exec(rtems_task_argument TaskArg) |
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158 | { |
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159 | printf("Low_Exec (%d) begins...\n", TaskArg); |
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160 | |
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161 | /* Delay less than High-prio task so that we take the remote HW access |
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162 | * resource before it does it. However, delay longer than the mid-prio |
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163 | * tasks so that we know for certain that they have taken control over |
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164 | * the local HW access. |
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165 | */ |
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166 | rtems_task_wake_after(100); |
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167 | |
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168 | while(1) { |
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169 | AccessRemoteHw(); |
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170 | } |
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171 | |
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172 | /* JRS - task does not get here */ |
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173 | |
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174 | printf("Low_Exec (%d) ends...\n", TaskArg); |
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175 | while(1) { |
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176 | rtems_task_wake_after(10000); |
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177 | } |
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178 | } |
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179 | |
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180 | |
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181 | rtems_task LocalHwSim_Exec(rtems_task_argument TaskArg) |
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182 | { |
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183 | int ISRCount = 0; |
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184 | printf("LocalHwSim_Exec begins...\n"); |
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185 | |
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186 | while(1) { |
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187 | if (StartHw) { |
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188 | /* A test task has activated the HW, wait for a while and then |
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189 | * generate an interrupt |
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190 | */ |
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191 | rtems_task_wake_after(100); |
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192 | |
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193 | StartHw = FALSE; |
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194 | #if 0 |
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195 | fprintf( stderr, "StartHw -- fire ISR (%d)\n", ++ISRCount ); |
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196 | #endif |
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197 | #if defined(TEST_USE_ISR) |
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198 | __asm__ volatile ("ta 5"); |
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199 | __asm__ volatile ("nop"); |
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200 | __asm__ volatile ("nop"); |
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201 | #else |
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202 | LocalHwIsr( 0x85 ); |
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203 | #endif |
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204 | } |
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205 | |
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206 | } |
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207 | |
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208 | printf("LocalHwSim_Exec ends...\n"); |
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209 | while(1) { |
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210 | rtems_task_wake_after(10000); |
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211 | } |
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212 | } |
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213 | |
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214 | |
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215 | rtems_isr LocalHwIsr(/*in*/ rtems_vector_number Vector) |
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216 | { |
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217 | rtems_status_code status; |
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218 | |
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219 | /* Signal synchroniztion semaphore to invoke waiting task */ |
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220 | status = rtems_semaphore_release(LocalHwSync_S); |
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221 | if (status != RTEMS_SUCCESSFUL) { |
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222 | fprintf( stderr, "LocalHwISR release %d\n", status ); |
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223 | while(1); /* Error */ |
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224 | } |
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225 | |
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226 | return; |
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227 | } |
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228 | |
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229 | void AccessLocalHw(void) |
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230 | { |
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231 | rtems_status_code Sts; |
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232 | |
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233 | rtems_task_priority EnterPrio; /* Statistics log */ |
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234 | rtems_task_priority AccessPrio; /* : */ |
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235 | rtems_task_priority LeavePrio; /* : */ |
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236 | uint32_t EnterCnt; /* : */ |
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237 | uint32_t AccessCnt; /* : */ |
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238 | uint32_t LeaveCnt; /* : */ |
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239 | |
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240 | /* Store information about the current situation */ |
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241 | EnterPrio = _Thread_Executing->current_priority; |
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242 | EnterCnt = _Thread_Executing->resource_count; |
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243 | |
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244 | |
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245 | printf(" AccessLocalHw called by %s\n", CallerName()); |
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246 | |
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247 | /* Obtain exclusive access to local HW, Start HW, Wait for completion, |
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248 | * Release access |
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249 | */ |
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250 | |
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251 | Sts = rtems_semaphore_obtain(LocalHwAccess_R, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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252 | directive_failed( Sts, "rtems_semaphore_obtain(LocalHwAccess_R...)" ); |
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253 | |
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254 | StartHw = TRUE; |
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255 | |
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256 | Sts = rtems_semaphore_obtain(LocalHwSync_S, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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257 | directive_failed( Sts, "rtems_semaphore_obtain(LocalHwAccess_R...)" ); |
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258 | |
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259 | /* Store information about the current situation */ |
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260 | AccessPrio = _Thread_Executing->current_priority; |
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261 | AccessCnt = _Thread_Executing->resource_count; |
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262 | |
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263 | Sts = rtems_semaphore_release(LocalHwAccess_R); |
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264 | directive_failed( Sts, "rtems_semaphore_release(LocalHwAccess_R)" ); |
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265 | |
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266 | /* Store information about the current situation */ |
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267 | LeavePrio = _Thread_Executing->current_priority; |
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268 | LeaveCnt = _Thread_Executing->resource_count; |
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269 | |
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270 | #if defined(TEST_PRINT_STATISTICS) |
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271 | printf( |
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272 | " AccessLocalHw from %s statistics:\n" |
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273 | " - Prio: %d -> %d -> %d\n - Cnt: %d -> %d -> %d\n", |
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274 | CallerName(), |
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275 | EnterPrio, AccessPrio, LeavePrio, |
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276 | EnterCnt, AccessCnt, LeaveCnt |
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277 | ); |
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278 | #endif |
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279 | |
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280 | printf(" AccessLocalHw returns to %s\n", CallerName()); |
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281 | #if defined(TEST_EXIT_AFTER_ITERATIONS) |
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282 | if ( ++Iterations == 10 ) { |
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283 | puts( "*** END OF TEST 35 ***" ); |
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284 | exit(0); |
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285 | } |
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286 | #endif |
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287 | return; |
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288 | } |
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289 | |
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290 | void AccessRemoteHw(void) |
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291 | { |
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292 | rtems_status_code Sts; |
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293 | |
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294 | rtems_task_priority EnterPrio; /* Statistics log */ |
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295 | rtems_task_priority AccessPrio; /* : */ |
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296 | rtems_task_priority LeavePrio; /* : */ |
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297 | uint32_t EnterCnt; /* : */ |
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298 | uint32_t AccessCnt; /* : */ |
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299 | uint32_t LeaveCnt; /* : */ |
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300 | |
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301 | /* Store information about the current situation */ |
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302 | EnterPrio = _Thread_Executing->current_priority; |
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303 | EnterCnt = _Thread_Executing->resource_count; |
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304 | |
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305 | |
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306 | printf("AccessRemoteHw called by %s\n", CallerName()); |
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307 | |
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308 | /* Obtain exclusive access to remote HW, Start HW, Wait for completion, |
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309 | * Release access |
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310 | */ |
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311 | |
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312 | Sts = rtems_semaphore_obtain(RemoteHwAccess_R, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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313 | directive_failed( Sts, "rtems_semaphore_obtain(RemoteHwAccess_R...)" ); |
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314 | |
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315 | /* Carry out the remote access via the Local HW interface */ |
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316 | printf("AccessRemoteHw access local %s\n", CallerName()); |
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317 | AccessLocalHw(); |
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318 | |
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319 | /* Store information about the current situation */ |
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320 | AccessPrio = _Thread_Executing->current_priority; |
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321 | AccessCnt = _Thread_Executing->resource_count; |
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322 | |
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323 | Sts = rtems_semaphore_release(RemoteHwAccess_R); |
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324 | directive_failed( Sts, "rtems_semaphore_release(RemoreHwAccess_R" ); |
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325 | |
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326 | /* Store information about the current situation */ |
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327 | LeavePrio = _Thread_Executing->current_priority; |
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328 | LeaveCnt = _Thread_Executing->resource_count; |
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329 | |
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330 | #if defined(TEST_PRINT_STATISTICS) |
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331 | printf( |
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332 | "\nAccessRemoteHw from %s statistics:\n" |
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333 | " - Prio: %d -> %d -> %d\n - Cnt: %d -> %d -> %d\n", |
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334 | CallerName(), |
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335 | EnterPrio, AccessPrio, LeavePrio, |
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336 | EnterCnt, AccessCnt, LeaveCnt); |
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337 | #endif |
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338 | |
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339 | printf("AccessRemoteHw returns to %s\n", CallerName()); |
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340 | return; |
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341 | } |
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342 | |
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343 | /*************************************************************************/ |
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344 | /********************** INITIALIZATION *********************/ |
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345 | /*************************************************************************/ |
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346 | |
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347 | /* The Init operation (the Init-task) */ |
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348 | rtems_task Init(rtems_task_argument ignored) |
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349 | { |
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350 | rtems_status_code status; |
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351 | #if defined(TEST_USE_ISR) |
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352 | rtems_isr_entry DummyIsr; |
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353 | #endif |
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354 | int i; |
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355 | |
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356 | puts( "\n\n*** TEST 35 ***" ); |
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357 | |
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358 | /* Create synchronisation semaphore for LocalHwIsr -> Test Tasks */ |
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359 | status = rtems_semaphore_create( |
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360 | rtems_build_name ('S', 'Y', 'N', 'C'), /* name */ |
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361 | 0, /* initial count = 0 */ |
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362 | RTEMS_LOCAL | |
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363 | RTEMS_SIMPLE_BINARY_SEMAPHORE | |
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364 | RTEMS_NO_INHERIT_PRIORITY | |
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365 | RTEMS_NO_PRIORITY_CEILING | |
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366 | RTEMS_FIFO, |
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367 | 0, |
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368 | &LocalHwSync_S); /* *id */ |
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369 | directive_failed( status, "rtems_semaphore_create (SYNC)" ); |
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370 | |
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371 | printf( "Sync Mutex Id = 0x%08x\n", LocalHwSync_S ); |
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372 | |
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373 | /* Create resource semaphore for exclusive access to the local HW */ |
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374 | status = rtems_semaphore_create( |
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375 | rtems_build_name ('R', 'E', 'S', '1'), /* name */ |
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376 | 1, /* count */ |
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377 | RTEMS_PRIORITY | |
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378 | RTEMS_BINARY_SEMAPHORE | |
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379 | RTEMS_INHERIT_PRIORITY | |
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380 | RTEMS_LOCAL, /* attribute_set */ |
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381 | 1, /* insignificant */ /* priority_ceiling */ |
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382 | &LocalHwAccess_R); /* *id */ |
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383 | directive_failed( status, "rtems_semaphore_create (RES1)" ); |
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384 | |
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385 | printf( "Local Mutex Id = 0x%08x\n", LocalHwAccess_R ); |
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386 | |
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387 | /* Create resource semaphore for exclusive access to the remote HW */ |
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388 | status = rtems_semaphore_create( |
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389 | rtems_build_name ('R', 'E', 'S', '2'), /* name */ |
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390 | 1, /* count */ |
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391 | RTEMS_PRIORITY | |
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392 | RTEMS_BINARY_SEMAPHORE | |
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393 | RTEMS_INHERIT_PRIORITY | |
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394 | RTEMS_LOCAL, /* attribute_set */ |
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395 | 1, /* insignificant */ /* priority_ceiling */ |
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396 | &RemoteHwAccess_R); /* *id */ |
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397 | directive_failed( status, "rtems_semaphore_create (RES2)" ); |
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398 | |
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399 | printf( "Remote Mutex Id = 0x%08x\n", RemoteHwAccess_R ); |
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400 | |
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401 | #if defined(TEST_USE_ISR) |
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402 | /* Install ISR for HW/SW synchronization, use ta 0x85 which is synchronous */ |
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403 | status = rtems_interrupt_catch(LocalHwIsr, 0x85 + 0x100, &DummyIsr); |
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404 | directive_failed( status, "rtems_interrupt_catch" ); |
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405 | #endif |
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406 | |
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407 | |
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408 | printf("Ending Init-task\n"); |
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409 | /* Create and start all tasks in the test */ |
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410 | |
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411 | /* -- Medium-prio Test Tasks --- */ |
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412 | for (i = 0; i < NofMediumTask_C; i++) { |
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413 | #define MEDIUM_PRIORITY ((RTEMS_MAXIMUM_PRIORITY / 2) + 1) |
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414 | status = rtems_task_create( |
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415 | rtems_build_name('M','E','D','0'+i), /* Name */ |
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416 | MEDIUM_PRIORITY, /* Priority */ |
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417 | RTEMS_MINIMUM_STACK_SIZE*2, /* Stack size (8KB) */ |
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418 | RTEMS_DEFAULT_MODES | RTEMS_NO_ASR, /* Mode */ |
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419 | RTEMS_DEFAULT_ATTRIBUTES | RTEMS_FLOATING_POINT, /* Attributes */ |
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420 | &TaMedium[i]); /* Assigned ID */ |
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421 | directive_failed( status, "rtems_task_create (MEDn)" ); |
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422 | |
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423 | printf( "TaMedium[%d] Id = 0x%08x\n", i, TaMedium[i] ); |
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424 | status = rtems_task_start(TaMedium[i], Medium_Exec, i); |
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425 | directive_failed( status, "rtems_task_start (MEDn)" ); |
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426 | } |
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427 | |
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428 | /* -- High-prio Test Task --- */ |
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429 | #define HIGH_PRIORITY ((RTEMS_MAXIMUM_PRIORITY / 2)) |
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430 | status = rtems_task_create( |
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431 | rtems_build_name('H','I','G','H'), /* Name */ |
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432 | HIGH_PRIORITY, /* Priority */ |
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433 | RTEMS_MINIMUM_STACK_SIZE*2, /* Stack size (8KB) */ |
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434 | RTEMS_DEFAULT_MODES | RTEMS_NO_ASR, /* Mode */ |
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435 | RTEMS_DEFAULT_ATTRIBUTES | RTEMS_FLOATING_POINT, /* Attributes */ |
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436 | &TaHigh); /* Assigned ID */ |
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437 | directive_failed( status, "rtems_task_create (HIGH)" ); |
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438 | |
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439 | printf( "TaHigh Id = 0x%08x\n", TaHigh ); |
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440 | status = rtems_task_start(TaHigh, High_Exec, 0); |
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441 | directive_failed( status, "rtems_task_start (HIGH)" ); |
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442 | |
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443 | /* -- Low-prio Test Task --- */ |
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444 | #define LOW_PRIORITY (RTEMS_MAXIMUM_PRIORITY - 1) |
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445 | status = rtems_task_create( |
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446 | rtems_build_name('L','O','W',' '), /* Name */ |
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447 | LOW_PRIORITY, /* Priority */ |
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448 | RTEMS_MINIMUM_STACK_SIZE*2, /* Stack size (8KB) */ |
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449 | RTEMS_DEFAULT_MODES | RTEMS_NO_ASR, /* Mode */ |
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450 | RTEMS_DEFAULT_ATTRIBUTES | RTEMS_FLOATING_POINT, /* Attributes */ |
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451 | &TaLow); /* Assigned ID */ |
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452 | directive_failed( status, "rtems_task_create (LOW)" ); |
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453 | |
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454 | printf( "TaLow Id = 0x%08x\n", TaLow ); |
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455 | status = rtems_task_start(TaLow, Low_Exec, 0); |
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456 | directive_failed( status, "rtems_task_start (LOW)" ); |
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457 | |
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458 | /* -- HW Simulator Task --- */ |
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459 | #define HWTASK_PRIORITY (RTEMS_MAXIMUM_PRIORITY - 2) |
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460 | status = rtems_task_create( |
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461 | rtems_build_name('H','W','S','M'), /* Name */ |
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462 | HWTASK_PRIORITY, /* Priority */ |
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463 | RTEMS_MINIMUM_STACK_SIZE*2, /* Stack size (8KB) */ |
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464 | RTEMS_DEFAULT_MODES | RTEMS_NO_ASR, /* Mode */ |
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465 | RTEMS_DEFAULT_ATTRIBUTES | RTEMS_FLOATING_POINT, /* Attributes */ |
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466 | &TaHwSim); /* Assigned ID */ |
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467 | directive_failed( status, "rtems_task_create (HWSM)" ); |
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468 | |
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469 | printf( "TaHwSim Id = 0x%08x\n", TaHwSim ); |
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470 | |
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471 | status = rtems_task_start(TaHwSim, LocalHwSim_Exec, 0); |
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472 | directive_failed( status, "rtems_task_start (HWSM)" ); |
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473 | |
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474 | /* Destroy the Init task (and let the ready tasks start running) */ |
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475 | rtems_task_delete(RTEMS_SELF); |
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476 | } |
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477 | |
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478 | /* configuration information */ |
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479 | |
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480 | #define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER |
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481 | #define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER |
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482 | |
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483 | #define CONFIGURE_RTEMS_INIT_TASKS_TABLE |
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484 | |
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485 | #define CONFIGURE_EXTRA_TASK_STACKS (RTEMS_MINIMUM_STACK_SIZE * 3) |
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486 | |
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487 | #define CONFIGURE_MAXIMUM_TASKS 10 |
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488 | #define CONFIGURE_MAXIMUM_SEMAPHORES 10 |
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489 | |
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490 | #include <rtems/confdefs.h> |
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491 | |
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492 | /* end of file */ |
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