FreeCalypso > hg > fc-selenite
annotate src/g23m-gprs/llc/llc_uirxf.c @ 39:4934b474b5c3
components/nucleus_intram: incorporated tct.s from TCS211
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 17 Jul 2018 07:35:40 +0000 |
parents | d393cd9bb723 |
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rev | line source |
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1
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1 /* |
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2 +----------------------------------------------------------------------------- |
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3 | Project : |
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4 | Modul : |
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5 +----------------------------------------------------------------------------- |
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6 | Copyright 2002 Texas Instruments Berlin, AG |
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7 | All rights reserved. |
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8 | |
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9 | This file is confidential and a trade secret of Texas |
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10 | Instruments Berlin, AG |
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11 | The receipt of or possession of this file does not convey |
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12 | any rights to reproduce or disclose its contents or to |
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13 | manufacture, use, or sell anything it may describe, in |
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14 | whole, or in part, without the specific written consent of |
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15 | Texas Instruments Berlin, AG. |
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16 +----------------------------------------------------------------------------- |
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17 | Purpose : This modul is part of the entity LLC and implements all |
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18 | procedures and functions as described in the |
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19 | SDL-documentation (UIRX-statemachine) |
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20 +----------------------------------------------------------------------------- |
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21 */ |
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22 |
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23 #ifndef LLC_UIRXF_C |
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24 #define LLC_UIRXF_C |
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25 #endif |
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26 |
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27 #define ENTITY_LLC |
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28 |
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29 /*==== INCLUDES =============================================================*/ |
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30 |
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31 #include "typedefs.h" /* to get Condat data types */ |
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32 #include "vsi.h" /* to get a lot of macros */ |
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33 #include "macdef.h" |
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34 #include "gprs.h" |
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35 #include "gsm.h" /* to get a lot of macros */ |
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36 #include "cnf_llc.h" /* to get cnf-definitions */ |
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37 #include "mon_llc.h" /* to get mon-definitions */ |
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38 #include "prim.h" /* to get the definitions of used SAP and directions */ |
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39 #include "llc.h" /* to get the global entity definitions */ |
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40 |
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41 #include "llc_uirxf.h" /* to compare own prototyes */ |
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42 /*==== CONST ================================================================*/ |
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43 |
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44 /*==== LOCAL VARS ===========================================================*/ |
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45 |
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46 /*==== PRIVATE FUNCTIONS ====================================================*/ |
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47 |
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48 /*==== PUBLIC FUNCTIONS =====================================================*/ |
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49 |
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50 |
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51 /* |
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52 +------------------------------------------------------------------------------ |
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53 | Function : uirx_queue_clean |
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54 +------------------------------------------------------------------------------ |
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55 | Description : This procedure removes all entries from the UIRX queue |
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56 | |
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57 | Parameters : |
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58 | |
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59 +------------------------------------------------------------------------------ |
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60 */ |
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61 GLOBAL void uirx_queue_clean (void) |
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62 { |
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63 T_UIRX_QUEUE** entry = &(llc_data->uirx->queue); |
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64 |
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65 TRACE_FUNCTION( "uirx_queue_clean" ); |
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66 |
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67 while (*entry) |
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68 { |
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69 /* |
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70 * get pointer to next (=first) entry |
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71 */ |
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72 T_UIRX_QUEUE* current = *entry; |
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73 |
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74 /* |
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75 * Free frame, if one is attached to the entry |
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76 */ |
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77 if (current->frame != NULL) |
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78 { |
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79 PFREE (current->frame); |
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80 } |
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81 |
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82 /* |
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83 * remove next entry from the entry (make second to first) |
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84 */ |
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85 *entry = current->next; |
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86 |
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87 /* |
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88 * free the removed entry |
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89 */ |
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90 MFREE (current); |
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91 } |
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92 |
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93 } /* uirx_queue_clean() */ |
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94 |
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95 /* |
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96 +------------------------------------------------------------------------------ |
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97 | Function : uirx_queue_store |
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98 +------------------------------------------------------------------------------ |
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99 | Description : This procedure stores the primitive to the end of the queue. |
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100 | If the queue is full, an the primitive is freed. |
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101 | |
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102 | Parameters : |
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103 | |
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104 +------------------------------------------------------------------------------ |
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105 */ |
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106 GLOBAL void uirx_queue_store (T_LL_UNITDATA_IND *ll_unitdata_ind) |
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107 { |
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108 T_UIRX_QUEUE** entry = &(llc_data->uirx->queue); |
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109 int num_entries = 0; |
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110 |
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111 TRACE_FUNCTION( "uirx_queue_store" ); |
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112 |
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113 /* |
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114 * Skip, but count, already for L3 ready waiting entries. |
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115 * If queue is already full, free this primitive. |
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116 */ |
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117 while (*entry) |
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118 { |
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119 num_entries++; |
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120 |
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121 if (num_entries >= UIRX_QUEUE_SIZE) |
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122 { |
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123 PFREE (ll_unitdata_ind); |
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124 TRACE_EVENT ("LL_UNITDATA_IND ignored -> UIRX queue is full"); |
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125 return; |
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126 } |
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127 |
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128 entry = &((*entry)->next); |
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129 } |
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130 |
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131 /* |
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132 * Allocate management memory |
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133 */ |
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134 MALLOC( *entry, sizeof(T_UIRX_QUEUE) ); |
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135 |
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136 if (*entry) |
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137 { |
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138 /* |
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139 * Queue primitive |
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140 */ |
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141 (*entry)->next = NULL; |
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142 (*entry)->frame = ll_unitdata_ind; |
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143 |
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144 } |
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145 else |
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146 { |
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147 /* |
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148 * Out of memory |
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149 */ |
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150 PFREE (ll_unitdata_ind); |
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151 TRACE_ERROR( "Out of memory in uirx_queue_store()" ); |
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152 } |
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153 |
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154 } /* uirx_queue_store() */ |
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155 |
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156 |
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157 /* |
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158 +------------------------------------------------------------------------------ |
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159 | Function : uirx_queue_retrieve |
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160 +------------------------------------------------------------------------------ |
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161 | Description : Retrieve the next frame, if any. |
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162 | |
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163 | Parameters : |
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164 | |
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165 +------------------------------------------------------------------------------ |
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166 */ |
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167 GLOBAL BOOL uirx_queue_retrieve (T_LL_UNITDATA_IND **ll_unitdata_ind) |
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168 { |
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169 T_UIRX_QUEUE** entry = &(llc_data->uirx->queue); |
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170 |
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171 TRACE_FUNCTION( "uirx_queue_retrieve" ); |
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172 |
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173 /* |
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174 * Take the first queue entry, if there is any. |
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175 */ |
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176 if (*entry) |
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177 { |
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178 /* |
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179 * Store pointer to the entry |
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180 */ |
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181 T_UIRX_QUEUE* current = *entry; |
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182 |
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183 /* |
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184 * Remove entry from the queue (make second to first) |
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185 */ |
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186 *entry = current->next; |
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187 |
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188 *ll_unitdata_ind = current->frame; |
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189 |
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190 /* |
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191 * Free retrieved management entry |
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192 */ |
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193 MFREE (current); |
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194 |
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195 return TRUE; |
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196 } |
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197 else |
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198 { |
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199 /* |
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200 * Set default return values |
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201 */ |
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202 *ll_unitdata_ind = NULL; |
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203 |
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204 return FALSE; |
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205 } |
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206 |
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207 } /* uirx_queue_retrieve() */ |
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208 |
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209 /* |
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210 +------------------------------------------------------------------------------ |
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211 | Function : uirx_init |
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212 +------------------------------------------------------------------------------ |
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213 | Description : This procedure initialises all necessary variables of |
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214 | ui_frames_rx for all SAPIs. |
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215 | |
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216 | Parameters : |
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217 | |
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218 +------------------------------------------------------------------------------ |
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219 */ |
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220 GLOBAL void uirx_init (void) |
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221 { |
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222 UBYTE inc; |
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223 |
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224 TRACE_FUNCTION( "uirx_init" ); |
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225 |
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226 /* |
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227 * Initialise every incarnation of UIRX with state TLLI_UNASSIGNED_NOT_READY, |
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228 * except incarnation 0 (= SAPI 1), because we have no flow control for |
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229 * SAPI 1. |
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230 */ |
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231 SWITCH_SERVICE (llc, uirx, 0); |
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232 INIT_STATE (UIRX_0, UIRX_TLLI_UNASSIGNED_READY); |
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233 |
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234 SWITCH_SERVICE (llc, uirx, 1); |
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235 INIT_STATE (UIRX_1, UIRX_TLLI_UNASSIGNED_NOT_READY); |
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236 |
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237 SWITCH_SERVICE (llc, uirx, 2); |
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238 INIT_STATE (UIRX_2, UIRX_TLLI_UNASSIGNED_NOT_READY); |
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239 |
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240 SWITCH_SERVICE (llc, uirx, 3); |
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241 INIT_STATE (UIRX_3, UIRX_TLLI_UNASSIGNED_NOT_READY); |
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242 |
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243 SWITCH_SERVICE (llc, uirx, 4); |
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244 INIT_STATE (UIRX_4, UIRX_TLLI_UNASSIGNED_NOT_READY); |
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245 |
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246 SWITCH_SERVICE (llc, uirx, 5); |
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247 INIT_STATE (UIRX_5, UIRX_TLLI_UNASSIGNED_NOT_READY); |
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248 |
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249 /* |
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250 * Initialise the UIRX queue structure |
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251 */ |
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252 for (inc = 0; inc < UIRX_NUM_INC; inc++) |
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253 { |
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254 SWITCH_SERVICE (llc, uirx, inc); |
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255 |
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256 /* |
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257 * Free old used resources (in case of an LLC restart): |
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258 */ |
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259 uirx_queue_clean (); |
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260 llc_data->uirx->queue = NULL; |
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261 } |
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262 |
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263 return; |
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264 } /* uirx_init() */ |
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265 |
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266 |
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267 /* |
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268 +------------------------------------------------------------------------------ |
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269 | Function : uirx_init_sapi |
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270 +------------------------------------------------------------------------------ |
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271 | Description : This procedure initialises all necessary variables of |
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272 | ui_frames_rx for the given SAPI. |
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273 | |
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274 | Parameters : |
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275 | |
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276 +------------------------------------------------------------------------------ |
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277 */ |
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278 GLOBAL void uirx_init_sapi (void) |
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279 { |
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280 TRACE_FUNCTION( "uirx_init_sapi" ); |
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281 |
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282 /* |
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283 * <R.LLC.TLLI_ASS.A.007>, <R.LLC.TLLI_ASS.A.009> |
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284 */ |
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285 llc_data->sapi->vur = 0; |
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286 |
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287 llc_data->uirx->last_32_frames_bitfield = 0L; |
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288 |
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289 return; |
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290 } /* uirx_init_sapi() */ |
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291 |
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292 |
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293 |
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294 /* |
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295 +------------------------------------------------------------------------------ |
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296 | Function : uirx_store_nu |
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297 +------------------------------------------------------------------------------ |
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298 | Description : This procedure stores the given n(u) in a list of the last 32 |
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299 | received n(u)s concerning the given SAPI. Therefore the |
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300 | variable v(ur) is passed to the procedure, which contains |
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301 | the current value of the unacknowledged receive sequence |
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302 | number. |
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303 | |
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304 | Parameters : nu - N(U), must be in the range vur-32 <= nu < vur |
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305 | vur - V(UR) |
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306 | |
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307 +------------------------------------------------------------------------------ |
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308 */ |
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309 GLOBAL void uirx_store_nu (T_FRAME_NUM nu, T_FRAME_NUM vur) |
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310 { |
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311 USHORT diff; |
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312 |
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313 |
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314 TRACE_FUNCTION( "uirx_store_nu" ); |
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315 |
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316 /* |
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317 * Set the bit for the received N(U) in last_32_frames_bitfield. The |
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318 * relative bit position referring to V(UR) has already been stored |
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319 * in diff. |
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320 */ |
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321 diff = (vur + (MAX_SEQUENCE_NUMBER+1) - nu - 1) % (MAX_SEQUENCE_NUMBER+1); |
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322 |
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323 llc_data->uirx->last_32_frames_bitfield |= (0x00000001L) << diff; |
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324 |
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325 return; |
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326 } /* uirx_store_nu() */ |
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327 |
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328 |
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329 |
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330 /* |
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331 +------------------------------------------------------------------------------ |
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332 | Function : uirx_check_nu |
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333 +------------------------------------------------------------------------------ |
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334 | Description : This procedure checks if the given n(u) has already been |
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335 | received for the current SAPI within the last 32 frames (see |
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336 | procedure store_nu). |
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337 | |
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338 | Parameters : nu - N(U), must be in the range vur-32 <= nu < vur |
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339 | vur - V(UR) |
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340 | |
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341 | Returns : TRUE - if frame was already received. |
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342 | FALSE - else |
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343 +------------------------------------------------------------------------------ |
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344 */ |
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345 GLOBAL BOOL uirx_check_nu (T_FRAME_NUM nu, T_FRAME_NUM vur) |
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346 { |
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347 USHORT diff; |
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348 |
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349 |
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350 TRACE_FUNCTION( "uirx_check_nu" ); |
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351 |
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352 /* |
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353 * The difference (modulo counted) between V(UR) and N(U) is |
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354 * calculated as follows: |
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355 * - add 512 (maximum sequence number + 1) to V(UR), in case V(UR) |
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356 * is smaller than N(U) |
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357 * - subtract N(U) |
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358 * - subtract 1 because V(UR) is not contained within |
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359 * last_32_frames_bitfield and thus the bit shift must be one less |
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360 * - afterwards apply modulo 512 to get back into the range of |
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361 * sequence numbers, because we added this value initially to |
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362 * V(UR) |
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363 */ |
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364 diff = (vur + (MAX_SEQUENCE_NUMBER+1) - nu - 1) % (MAX_SEQUENCE_NUMBER + 1); |
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365 |
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366 /* |
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367 * Check if the corresponding bit of N(U) in last_32_frames_bitfield is |
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368 * set. The bit is stored in last_32_frames_bitfield relative to V(UR). |
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369 */ |
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370 return ((llc_data->uirx->last_32_frames_bitfield & (0x00000001L << diff)) != 0L); |
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371 } /* uirx_check_nu() */ |
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372 |
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373 |
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374 /* |
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375 +------------------------------------------------------------------------------ |
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376 | Function : uirx_set_new_vur |
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377 +------------------------------------------------------------------------------ |
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378 | Description : This procedure handles setting vur to a new value. The modulo |
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379 | operation and the handling of the last_32_frames_bitfield |
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380 | is done here. |
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381 | |
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382 | Parameters : new_vur - V(UR), must be in range V(UR) < new_vur < V(UR)-32 |
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383 | |
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384 +------------------------------------------------------------------------------ |
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385 */ |
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386 GLOBAL void uirx_set_new_vur (T_FRAME_NUM new_vur) |
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387 { |
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388 USHORT diff; |
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389 |
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390 |
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391 TRACE_FUNCTION( "uirx_set_new_vur" ); |
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392 |
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393 new_vur %= (MAX_SEQUENCE_NUMBER+1); |
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394 |
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395 /* |
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396 * The difference (modulo counted) between V(UR) and the new_vur is |
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397 * calculated as follows: |
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398 * - add 512 (maximum sequence number + 1) to new_vur |
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399 * - subtract V(UR) |
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400 * - afterwards apply modulo 512 to get back into the range of |
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401 * sequence numbers, because we added this value initially |
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402 */ |
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403 diff = (new_vur + (MAX_SEQUENCE_NUMBER+1) - llc_data->sapi->vur) |
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404 % (MAX_SEQUENCE_NUMBER+1); |
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405 |
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406 /* |
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407 * Now move the bitfield indicating the last 32 frames numbers. If the diff |
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408 * from current to new_vur is to large, the bitfild is automaticly cleard |
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409 * by shifting all bits out. |
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410 */ |
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411 llc_data->uirx->last_32_frames_bitfield <<= diff; |
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412 |
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413 /* |
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414 * Increase oc if necessary. If new_vur is a higher value, no overflow |
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415 * encountered. If new_vur is lower, an retransmission could be possible |
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416 * or we have had an overflow. But this function will not be called in |
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417 * case of a retransmission! |
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418 */ |
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419 if ( new_vur < llc_data->sapi->vur ) |
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420 { |
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421 llc_data->sapi->oc_ui_rx += (MAX_SEQUENCE_NUMBER+1); |
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422 } |
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423 |
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424 /* |
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425 * Set net V(UR) value |
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426 */ |
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427 llc_data->sapi->vur = new_vur; |
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428 |
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429 } /* uirx_set_new_vur() */ |
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430 |