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annotate src/nucleus/tcd.c @ 136:7d5b412ffb6c

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aci: AT%VBAT and melody play enhancements from Magnetite
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 07 Jan 2019 18:47:52 +0000
parents 0f80e1e4dce4
children
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1 /*************************************************************************/
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2 /* */
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3 /* Copyright Mentor Graphics Corporation 2002 */
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4 /* All Rights Reserved. */
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5 /* */
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6 /* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS */
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7 /* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS */
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8 /* SUBJECT TO LICENSE TERMS. */
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9 /* */
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10 /*************************************************************************/
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11
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12 /*************************************************************************/
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13 /* */
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14 /* FILE NAME VERSION */
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15 /* */
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16 /* tcd.c Nucleus PLUS 1.14 */
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17 /* */
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18 /* COMPONENT */
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19 /* */
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20 /* TC - Thread Control */
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21 /* */
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22 /* DESCRIPTION */
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23 /* */
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24 /* This file contains global data structures for use within this */
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25 /* component. */
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26 /* */
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27 /* DATA STRUCTURES */
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28 /* */
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29 /* TCD_Created_Tasks_List Pointer to the linked-list */
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30 /* of created tasks */
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31 /* TCD_Total_Tasks Total number of created tasks*/
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32 /* TCD_Priority_List Array of pointers to ready */
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33 /* tasks, indexed by priority */
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34 /* TCD_Execute_Task Highest priority task to */
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35 /* execute */
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36 /* TCD_Priority_Groups Bit map of 32 groups of task */
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37 /* priority */
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38 /* TCD_Sub_Priority_Groups An array of 32 sub-priority */
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39 /* groups */
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40 /* TCD_Lowest_Set_Bit Lookup table to find the */
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41 /* lowest bit set in a byte */
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42 /* TCD_Highest_Priority Highest priority ready */
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43 /* TCD_Created_HISRs_List Pointer to the linked-list */
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44 /* of created HISRs */
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45 /* TCD_Total_HISRs Total number of created HISRs*/
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46 /* TCD_Active_HISR_Heads Active HISR list head ptrs */
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47 /* TCD_Active_HISR_Tails Active HISR list tail ptrs */
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48 /* TCD_Execute_HISR Highest priority HISR to */
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49 /* execute */
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50 /* TCD_Current_Thread Pointer to the currently */
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51 /* executing thread */
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52 /* TCD_Registered_LISRs List of registered LISRs */
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53 /* TCD_LISR_Pointers Actual LISR pointers */
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54 /* TCD_Interrupt_Count Count of ISRs in progress */
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55 /* TCD_Stack_Switched Flag indicating that stack */
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56 /* was switched in an ISR */
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57 /* TCD_List_Protect Task list protection */
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58 /* TCD_System_Protect System protection */
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59 /* TCD_System_Stack System stack pointer - top */
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60 /* TCD_LISR_Protect Protect LISR registration */
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61 /* TCD_HISR_Protect Protect the list of created */
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62 /* HISRs */
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63 /* TCD_Interrupt_Level Enable interrupt level */
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64 /* TCD_Unhandled_Interrupt Contains the most recent */
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65 /* unhandled interrupt in */
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66 /* system error conditions */
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67 /* */
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68 /* FUNCTIONS */
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69 /* */
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70 /* None */
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71 /* */
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72 /* DEPENDENCIES */
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73 /* */
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74 /* cs_defs.h Common Service constants */
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75 /* tc_defs.h Thread Control constants */
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76 /* */
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77 /* HISTORY */
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78 /* */
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79 /* DATE REMARKS */
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80 /* */
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81 /* 03-01-1993 Created initial version 1.0 */
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82 /* 04-19-1993 Verified version 1.0 */
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83 /* 01-01-1993 Added variable to save last */
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84 /* unhandled interrupt in system */
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85 /* error conditions, resulting in */
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86 /* version 1.0a */
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87 /* 11-01-1993 Verified version 1.0a */
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88 /* 03-01-1994 Change schedule protection to a */
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89 /* system protection to improve */
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90 /* performance, resulting in */
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91 /* version 1.1 */
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92 /* */
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93 /* 03-18-1994 Verified version 1.1 */
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94 /* 04-17-1996 updated to version 1.2 */
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95 /* 03-24-1998 Released version 1.3. */
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96 /* 03-26-1999 Released 1.11m (new release */
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97 /* numbering scheme) */
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98 /* 04-23-2001 Made TCD_LISR_Pointers array an exclusive count */
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99 /* 04-17-2002 Released version 1.13m */
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100 /* 11-07-2002 Released version 1.14 */
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101 /*************************************************************************/
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102 #define NU_SOURCE_FILE
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103
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104 #include "cs_defs.h" /* Common Service constants */
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105 #include "tc_defs.h" /* Thread Control constants */
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107
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108 /* TCD_Created_Tasks_List is the head pointer of the linked list of
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109 created tasks. If the list is NU_NULL, there are no tasks created. */
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111 CS_NODE *TCD_Created_Tasks_List;
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114 /* TCD_Total_Tasks contains the number of currently created tasks. */
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115
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116 UNSIGNED TCD_Total_Tasks;
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117
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118
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119 /* TCD_Priority_List is an array of TCB pointers. Each element of the array
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120 is effectively the head pointer of the list of tasks ready for execution
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121 at that priority. If the pointer is NULL, there are no tasks ready
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122 for execution at that priority. The array is indexed by priority. */
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123
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124 TC_TCB *TCD_Priority_List[TC_PRIORITIES];
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125
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126
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127 /* TCD_Priority_Groups is a 32-bit unsigned integer that is used as a bit
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128 map. Each bit corresponds to an 8-priority group. For example, if bit 0
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129 is set, at least one task of priority 0 through 8 is ready for execution. */
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130
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131 UNSIGNED TCD_Priority_Groups;
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132
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133
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134 /* TCD_Sub_Priority_Groups is an array of sub-priority groups. These are
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135 also used as bit maps. Index 0 of this array corresponds to priorities
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136 0 through 8. Bit 0 of this element represents priority 0, while bit 7
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137 represents priority 7. */
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138
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139 DATA_ELEMENT TCD_Sub_Priority_Groups[TC_MAX_GROUPS];
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140
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141
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142 /* TCD_Lowest_Set_Bit is nothing more than a standard lookup table. The
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143 table is indexed by values ranging from 1 to 255. The value at that
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144 position in the table indicates the number of the lowest set bit. This is
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145 used to determine the highest priority task represented in the previously
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146 defined bit maps. */
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147
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148 UNSIGNED_CHAR TCD_Lowest_Set_Bit[] = {0,
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149 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0,
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150 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1,
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151 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0,
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152 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2,
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153 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0,
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154 1, 0, 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1,
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155 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
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156 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3,
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157 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0,
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158 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1,
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159 0, 2, 0, 1, 0};
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160
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161
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162 /* TCD_Highest_Priority contains the highest priority task ready for execution.
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163 Note that this does not necessarily represent the priority of the currently
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164 executing task. This is true if the currently executing task has preemption
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165 disabled. If no tasks are executing, this variable is set to the maximum
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166 priority. */
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167
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168 INT TCD_Highest_Priority;
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169
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170
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171 /* TCD_Execute_Task is a pointer to the task to execute. Note that this
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172 pointer does not necessarily point to the currently executing task. There
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173 are several points in the system where this is true. One situation is
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174 when preemption is about to take place. Another situation can result from
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175 a internal protection conflict. */
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176
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177 TC_TCB *TCD_Execute_Task;
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178
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179
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180 /* TCD_Created_HISRs_List is the head pointer of the list of created High-
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181 Level Interrupt Service Routines (HISR). If this pointer is NU_NULL, there
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182 are no HISRs currently created. */
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183
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184 CS_NODE *TCD_Created_HISRs_List;
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185
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186
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187 /* TCD_Total_HISRs contains the number of currently created HISRs. */
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188
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189 UNSIGNED TCD_Total_HISRs;
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190
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191
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192 /* TCD_Active_HISR_Heads is an array of active HISR list head pointers.
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193 There are three HISR priorities available. The HISR priority is an index
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194 into this table. Priority/index 0 represents the highest priority. */
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195
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196 TC_HCB *TCD_Active_HISR_Heads[TC_HISR_PRIORITIES];
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197
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198
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199 /* TCD_Active_HISR_Tails is an array of active HISR list tail pointers.
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200 There are three HISR priorities available. The HISR priority is an index
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201 into this table. Priority/index 0 represents the highest priority. */
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202
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203 TC_HCB *TCD_Active_HISR_Tails[TC_HISR_PRIORITIES];
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204
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205
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206 /* TCD_Execute_HISR contains a pointer to the highest priority HISR to execute.
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207 If this pointer is NU_NULL, no HISRs are currently activated. Note that
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208 the current thread pointer is not always equal to this pointer. */
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209
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210 TC_HCB *TCD_Execute_HISR;
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211
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212
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213 /* TCD_Current_Thread points to the control block of the currently executing
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214 thread of execution. Therefore, this variable points at either a TC_TCB
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215 or a TC_HCB structure. Except for initialization, this variable is set
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216 and cleared in the target dependent portion of this component. */
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217
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218 VOID *TCD_Current_Thread;
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219
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220
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221 /* TCD_System_Stack contains the system stack base pointer. When the system
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222 is idle or in interrupt processing the system stack pointer is used. This
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223 variable is usually setup during target dependent initialization. */
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224
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225 VOID *TCD_System_Stack;
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226
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227
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228 /* TCD_Registered_LISRs is a list that specifies whether or not a
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229 LISR is registered for a given interrupt vector. If the value in the
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230 list indexed by the vector is non-zero, then that value can be used
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231 as the index into the list of LISR pointers to find the actual registered
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232 LISR. */
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233
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234 UNSIGNED_CHAR TCD_Registered_LISRs[NU_MAX_VECTORS+1];
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235
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237 /* TCD_LISR_Pointers is a list of LISR pointers that indicate the LISR function
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238 to call when the interrupt occurs. If the entry is NULL, it is
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239 available. */
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241 VOID (*TCD_LISR_Pointers[NU_MAX_LISRS+1])(INT vector);
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244 /* TCD_Interrupt_Count contains the number of Interrupt Service Routines (ISRs)
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245 currently in progress. If the contents of this variable is zero, then no
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246 interrupts are in progress. If the contents are greater than 1, nested
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247 interrupts are being processed. */
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248
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249 INT TCD_Interrupt_Count;
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251
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252 /* TCD_Stack_Switched contains a flag indicating that the system stack was
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253 switched to after the thread's context was saved. This variable is not
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254 used in all ports. */
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255
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256 INT TCD_Stack_Switched;
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259 /* TCD_List_Protect is a structure that is used to protect against multiple
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260 access to the list of established tasks. */
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261
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262 TC_PROTECT TCD_List_Protect;
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263
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264
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265 /* TCD_System_Protect is a structure that is used to provide protection
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266 against multiple threads accessing the same system structures at the
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267 same time. */
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268
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269 TC_PROTECT TCD_System_Protect;
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272 /* TCD_LISR_Protect is a structure that is used to provide protection against
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273 multiple threads accessing the LISR registration structures at the same
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274 time. */
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276 TC_PROTECT TCD_LISR_Protect;
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277
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279 /* TCD_HISR_Protect is a structure that is used to provide protection against
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280 multiple threads accessing the created HISR linked-list at the same time. */
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281
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282 TC_PROTECT TCD_HISR_Protect;
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283
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284
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285 /* TCD_Interrupt_Level is a variable that contains the enabled interrupt
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286 level. If the target processor does not have multiple enable interrupt
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287 levels, this variable is a boolean. */
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288
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289 INT TCD_Interrupt_Level;
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292 /* TCD_Unhandled_Interrupt is a variable that contains the last unhandled
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293 interrupt in system error conditions. */
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294
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295 INT TCD_Unhandled_Interrupt;
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300