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444 | serge | 1 | $Revision: 431 $ |
2 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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3 | ;; ;; |
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4 | ;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;; |
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5 | ;; Distributed under terms of the GNU General Public License ;; |
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6 | ;; ;; |
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7 | ;; ;; |
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8 | ;; QUEUE.INC ;; |
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9 | ;; ;; |
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10 | ;; Buffer queue management for Menuet OS TCP/IP Stack ;; |
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11 | ;; ;; |
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12 | ;; Version 0.3 29 August 2002 ;; |
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13 | ;; ;; |
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14 | ;; Copyright 2002 Mike Hibbett, mikeh@oceanfree.net ;; |
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15 | ;; ;; |
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16 | ;; See file COPYING for details ;; |
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17 | ;; ;; |
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18 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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1 | ha | 19 | |
20 | |||
21 | ;******************************************************************* |
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22 | ; Interface |
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23 | ; |
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24 | ; queueInit Configures the queues to empty |
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25 | ; dequeue Removes a buffer pointer from a queue |
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26 | ; queue Inserts a buffer pointer into a queue |
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27 | ; freeBuff Adds the buffer pointer to the list of free buffers |
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28 | ; queueSize Returns the number of entries in a queue |
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29 | ; |
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30 | ; The various defines for queue names can be found in stack.inc |
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31 | ; |
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32 | ;******************************************************************* |
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33 | |||
34 | |||
35 | ;*************************************************************************** |
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36 | ; Function |
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37 | ; freeBuff |
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38 | ; |
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39 | ; Description |
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40 | ; Adds a buffer number to the beginning of the free list. |
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41 | ; buffer number in eax ( ms word zeroed ) |
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42 | ; all other registers preserved |
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43 | ; This always works, so no error returned |
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44 | ;*************************************************************************** |
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45 | freeBuff: |
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46 | push ebx |
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47 | push ecx |
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48 | mov ebx, EMPTY_QUEUE |
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49 | shl ebx, 1 |
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50 | add ebx, queues |
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51 | cli ; Ensure that another process does not interfer |
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52 | movzx ecx, word [ebx] |
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53 | mov [ebx], ax |
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54 | shl eax, 1 |
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55 | add eax, queueList |
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56 | mov [eax], cx |
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57 | sti |
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58 | pop ecx |
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59 | pop ebx |
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60 | |||
61 | ret |
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62 | |||
63 | |||
64 | ;*************************************************************************** |
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65 | ; Function |
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66 | ; queueSize |
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67 | ; |
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68 | ; Description |
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69 | ; Counts the number of entries in a queue |
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70 | ; queue number in ebx ( ms word zeroed ) |
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71 | ; Queue size returned in eax |
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72 | ; This always works, so no error returned |
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73 | ;*************************************************************************** |
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74 | queueSize: |
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75 | xor eax, eax |
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76 | shl ebx, 1 |
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77 | add ebx, queues |
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78 | movzx ecx, word [ebx] |
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79 | cmp cx, NO_BUFFER |
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80 | je qs_exit |
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81 | |||
82 | qs_001: |
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83 | inc eax |
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84 | shl ecx, 1 |
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85 | add ecx, queueList |
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86 | movzx ecx, word [ecx] |
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87 | cmp cx, NO_BUFFER |
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88 | je qs_exit |
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89 | jmp qs_001 |
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90 | |||
91 | qs_exit: |
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92 | ret |
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93 | |||
94 | |||
95 | ;*************************************************************************** |
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96 | ; Function |
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97 | ; queue |
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98 | ; |
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99 | ; Description |
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100 | ; Adds a buffer number to the *end* of a queue |
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101 | ; This is quite quick because these queues will be short |
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102 | ; queue number in eax ( ms word zeroed ) |
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103 | ; buffer number in ebx ( ms word zeroed ) |
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104 | ; all other registers preserved |
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105 | ; This always works, so no error returned |
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106 | ;*************************************************************************** |
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107 | queue: |
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108 | push ebx |
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109 | shl ebx, 1 |
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110 | add ebx, queueList ; eax now holds address of queue entry |
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111 | mov [ebx], word NO_BUFFER ; This buffer will be the last |
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112 | |||
113 | cli |
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114 | shl eax, 1 |
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115 | add eax, queues ; eax now holds address of queue |
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116 | movzx ebx, word [eax] |
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117 | |||
118 | cmp bx, NO_BUFFER |
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119 | jne qu_001 |
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120 | |||
121 | pop ebx |
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122 | ; The list is empty, so add this to the head |
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123 | mov [eax], bx |
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124 | jmp qu_exit |
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125 | |||
126 | qu_001: |
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127 | ; Find the last entry |
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128 | shl ebx, 1 |
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129 | add ebx, queueList |
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130 | mov eax, ebx |
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131 | movzx ebx, word [ebx] |
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132 | cmp bx, NO_BUFFER |
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133 | jne qu_001 |
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134 | |||
135 | mov ebx, eax |
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136 | pop eax |
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137 | mov [ebx], ax |
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138 | |||
139 | qu_exit: |
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140 | sti |
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141 | ret |
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142 | |||
143 | |||
144 | |||
145 | ;*************************************************************************** |
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146 | ; Function |
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147 | ; dequeue |
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148 | ; |
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149 | ; Description |
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150 | ; removes a buffer number from the head of a queue |
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151 | ; This is fast, as it unlinks the first entry in the list |
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152 | ; queue number in eax ( ms word zeroed ) |
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153 | ; buffer number returned in eax ( ms word zeroed ) |
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154 | ; all other registers preserved |
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155 | ; |
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156 | ;*************************************************************************** |
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157 | dequeue: |
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158 | push ebx |
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159 | shl eax, 1 |
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160 | add eax, queues ; eax now holds address of queue |
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161 | mov ebx, eax |
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162 | cli |
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163 | movzx eax, word [eax] |
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164 | cmp ax, NO_BUFFER |
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165 | je dq_exit |
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166 | push eax |
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167 | shl eax, 1 |
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168 | add eax, queueList ; eax now holds address of queue entry |
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169 | mov ax, [eax] |
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170 | mov [ebx], ax |
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171 | pop eax |
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172 | |||
173 | dq_exit: |
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174 | sti |
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175 | pop ebx |
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176 | ret |
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177 | |||
178 | |||
179 | ;*************************************************************************** |
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180 | ; Function |
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181 | ; queueInit |
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182 | ; |
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183 | ; Description |
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184 | ; Initialises the queues to empty, and creates the free queue |
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185 | ; list. |
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186 | ; |
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187 | ;*************************************************************************** |
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188 | queueInit: |
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189 | mov esi, queues |
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190 | mov ecx, NUMQUEUES |
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191 | mov ax, NO_BUFFER |
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192 | |||
193 | qi001: |
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194 | mov [esi], ax |
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195 | inc esi |
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196 | inc esi |
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197 | loop qi001 |
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198 | |||
199 | mov esi, queues + ( 2 * EMPTY_QUEUE ) |
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200 | |||
201 | ; Initialise empty queue list |
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202 | |||
203 | xor ax, ax |
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204 | mov [esi], ax |
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205 | |||
206 | mov ecx, NUMQUEUEENTRIES - 1 |
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207 | mov esi, queueList |
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208 | |||
209 | qi002: |
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210 | inc ax |
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211 | mov [esi], ax |
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212 | inc esi |
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213 | inc esi |
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214 | loop qi002 |
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215 | |||
216 | mov ax, NO_BUFFER |
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217 | mov [esi], ax |
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218 | |||
219 | ret |