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annotate src/cs/system/main/gcc/int_dummy.S @ 0:92470e5d0b9e

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src: partial import from FC Selenite
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 15 May 2020 01:28:16 +0000
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1 /*
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2 * This assembly module contains a few dummy INT_*() functions
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3 * which are needed by Nucleus (tcc.c) but aren't used in TI's
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4 * environment. This code used to be in the big messy int.s
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5 * assembly module in the original version.
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6 */
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7
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8 .text
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9 .code 32
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10
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11 /*************************************************************************/
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12 /* */
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13 /* FUNCTION */
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14 /* */
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15 /* INT_Vectors_Loaded */
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16 /* */
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17 /* DESCRIPTION */
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18 /* */
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19 /* This function returns the flag that indicates whether or not */
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20 /* all the default vectors have been loaded. If it is false, */
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21 /* each LISR register also loads the ISR shell into the actual */
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22 /* vector table. */
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23 /* */
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24 /* AUTHOR */
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25 /* */
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26 /* Barry Sellew, Accelerated Technology, Inc. */
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27 /* */
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28 /* CALLED BY */
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29 /* */
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30 /* TCC_Register_LISR Register LISR for vector */
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31 /* */
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32 /* CALLS */
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33 /* */
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34 /* None */
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35 /* */
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36 /* INPUTS */
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37 /* */
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38 /* None */
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39 /* */
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40 /* OUTPUTS */
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41 /* */
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42 /* None */
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43 /* */
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44 /* HISTORY */
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45 /* */
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46 /* NAME DATE REMARKS */
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47 /* */
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48 /* B. Sellew 01-19-1996 Created initial version 1.0 */
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49 /* B. Sellew 01-22-1996 Verified version 1.0 */
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50 /* */
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51 /*************************************************************************/
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52
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53 @INT INT_Vectors_Loaded(void)
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54 @{
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55 .globl INT_Vectors_Loaded
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56 INT_Vectors_Loaded:
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57 @
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58 @ /* Just return the loaded vectors flag. */
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59 @ return(INT_Loaded_Flag);
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60 @
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61 MOV a1,#1 @ Always return TRUE since there
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62 @ are really only two normal
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63 @ vectors IRQ & FIQ
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64 BX lr @ Return to caller
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65 @}
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66
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67
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68 /*************************************************************************/
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69 /* */
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70 /* FUNCTION */
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71 /* */
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72 /* INT_Setup_Vector */
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73 /* */
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74 /* DESCRIPTION */
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75 /* */
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76 /* This function sets up the specified vector with the new vector */
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77 /* value. The previous vector value is returned to the caller. */
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78 /* */
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79 /* AUTHOR */
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80 /* */
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81 /* Barry Sellew, Accelerated Technology, Inc. */
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82 /* */
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83 /* CALLED BY */
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84 /* */
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85 /* Application */
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86 /* TCC_Register_LISR Register LISR for vector */
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87 /* */
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88 /* CALLS */
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89 /* */
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90 /* None */
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91 /* */
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92 /* INPUTS */
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93 /* */
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94 /* vector Vector number to setup */
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95 /* new Pointer to new assembly */
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96 /* language ISR */
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97 /* */
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98 /* OUTPUTS */
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99 /* */
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100 /* old vector contents */
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101 /* */
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102 /* HISTORY */
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103 /* */
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104 /* NAME DATE REMARKS */
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105 /* */
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106 /* B. Sellew 01-19-1996 Created initial version 1.0 */
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107 /* B. Sellew 01-22-1996 Verified version 1.0 */
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108 /* */
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109 /*************************************************************************/
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110
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111 @VOID *INT_Setup_Vector(INT vector, VOID *new)
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112 @{
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113 .globl INT_Setup_Vector
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114 INT_Setup_Vector:
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115 @
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116 @VOID *old_vector; /* Old interrupt vector */
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117 @VOID **vector_table; /* Pointer to vector table */
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118 @
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119 @ /* Calculate the starting address of the actual vector table. */
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120 @ vector_table = (VOID **) 0;
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121 @
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122 @ /* Pickup the old interrupt vector. */
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123 @ old_vector = vector_table[vector];
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124 @
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125 @ /* Setup the new interrupt vector. */
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126 @ vector_table[vector] = new;
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127 @
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128 @ /* Return the old interrupt vector. */
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129 @ return(old_vector);
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130 @
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131 MOV a1,#0 @ This routine is not applicable to
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132 @ THUMB, return a NULL pointer
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133 BX lr @ Return to caller
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134 @}
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135
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136
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137 /*************************************************************************/
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138 /* */
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139 /* FUNCTION */
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140 /* */
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141 /* INT_Retrieve_Shell */
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142 /* */
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143 /* DESCRIPTION */
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144 /* */
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145 /* This function retrieves the pointer to the shell interrupt */
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146 /* service routine. The shell interrupt service routine calls */
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147 /* the LISR dispatch routine. */
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148 /* */
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149 /* AUTHOR */
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150 /* */
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151 /* Barry Sellew, Accelerated Technology, Inc. */
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152 /* */
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153 /* CALLED BY */
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154 /* */
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155 /* TCC_Register_LISR Register LISR for vector */
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156 /* */
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157 /* CALLS */
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158 /* */
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159 /* None */
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160 /* */
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161 /* INPUTS */
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162 /* */
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163 /* vector Vector number to setup */
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164 /* */
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165 /* OUTPUTS */
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166 /* */
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167 /* shell pointer */
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168 /* */
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169 /* HISTORY */
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170 /* */
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171 /* NAME DATE REMARKS */
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172 /* */
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173 /* B. Sellew 01-19-1996 Created initial version 1.0 */
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174 /* B. Sellew 01-22-1996 Verified version 1.0 */
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175 /* */
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176 /*************************************************************************/
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177
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178 @VOID *INT_Retrieve_Shell(INT vector)
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179 @{
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180 .globl INT_Retrieve_Shell
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181 INT_Retrieve_Shell:
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182 @
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183 @ /* Return the LISR Shell interrupt routine. */
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184 @ return(INT_Vectors[vector]);
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185 @
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186 MOV a1,#0 @ This routine is not applicable to
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187 @ THUMB, return a NULL pointer
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188 BX lr @ Return to caller
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189 @}