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431 | serge | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License ;; |
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5 | ;; ;; |
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6 | ;; ;; |
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7 | ;; QUEUE.INC ;; |
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8 | ;; ;; |
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9 | ;; Buffer queue management for Menuet OS TCP/IP Stack ;; |
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10 | ;; ;; |
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11 | ;; Version 0.3 29 August 2002 ;; |
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12 | ;; ;; |
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13 | ;; Copyright 2002 Mike Hibbett, mikeh@oceanfree.net ;; |
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14 | ;; ;; |
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15 | ;; See file COPYING for details ;; |
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16 | ;; ;; |
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17 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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1 | ha | 18 | |
593 | mikedld | 19 | $Revision: 914 $ |
1 | ha | 20 | |
593 | mikedld | 21 | |
1 | ha | 22 | ;******************************************************************* |
23 | ; Interface |
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24 | ; |
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25 | ; queueInit Configures the queues to empty |
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26 | ; dequeue Removes a buffer pointer from a queue |
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27 | ; queue Inserts a buffer pointer into a queue |
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28 | ; freeBuff Adds the buffer pointer to the list of free buffers |
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29 | ; queueSize Returns the number of entries in a queue |
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30 | ; |
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31 | ; The various defines for queue names can be found in stack.inc |
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32 | ; |
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33 | ;******************************************************************* |
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34 | |||
35 | |||
36 | ;*************************************************************************** |
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37 | ; Function |
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38 | ; freeBuff |
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39 | ; |
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40 | ; Description |
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41 | ; Adds a buffer number to the beginning of the free list. |
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42 | ; buffer number in eax ( ms word zeroed ) |
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43 | ; all other registers preserved |
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44 | ; This always works, so no error returned |
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45 | ;*************************************************************************** |
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914 | serge | 46 | uglobal |
47 | freeBuff_cnt dd ? |
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48 | endg |
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1 | ha | 49 | freeBuff: |
914 | serge | 50 | ; inc [freeBuff_cnt] |
51 | ; DEBUGF 1, "K : freeBuff (%u)\n", [freeBuff_cnt] |
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1 | ha | 52 | push ebx |
53 | push ecx |
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914 | serge | 54 | mov ebx, queues + EMPTY_QUEUE * 2 |
1 | ha | 55 | cli ; Ensure that another process does not interfer |
914 | serge | 56 | mov cx, [ebx] |
1 | ha | 57 | mov [ebx], ax |
914 | serge | 58 | mov [queueList + eax * 2], cx |
1 | ha | 59 | sti |
60 | pop ecx |
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61 | pop ebx |
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62 | |||
63 | ret |
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64 | |||
65 | |||
66 | ;*************************************************************************** |
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67 | ; Function |
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68 | ; queueSize |
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69 | ; |
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70 | ; Description |
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71 | ; Counts the number of entries in a queue |
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72 | ; queue number in ebx ( ms word zeroed ) |
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73 | ; Queue size returned in eax |
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74 | ; This always works, so no error returned |
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75 | ;*************************************************************************** |
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76 | queueSize: |
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77 | xor eax, eax |
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78 | shl ebx, 1 |
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79 | add ebx, queues |
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80 | movzx ecx, word [ebx] |
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81 | cmp cx, NO_BUFFER |
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82 | je qs_exit |
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83 | |||
84 | qs_001: |
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85 | inc eax |
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86 | shl ecx, 1 |
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87 | add ecx, queueList |
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88 | movzx ecx, word [ecx] |
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89 | cmp cx, NO_BUFFER |
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90 | je qs_exit |
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91 | jmp qs_001 |
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92 | |||
93 | qs_exit: |
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94 | ret |
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95 | |||
96 | |||
97 | ;*************************************************************************** |
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98 | ; Function |
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99 | ; queue |
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100 | ; |
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101 | ; Description |
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102 | ; Adds a buffer number to the *end* of a queue |
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103 | ; This is quite quick because these queues will be short |
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104 | ; queue number in eax ( ms word zeroed ) |
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105 | ; buffer number in ebx ( ms word zeroed ) |
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106 | ; all other registers preserved |
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107 | ; This always works, so no error returned |
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108 | ;*************************************************************************** |
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914 | serge | 109 | uglobal |
110 | queue_cnt dd ? |
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111 | endg |
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1 | ha | 112 | queue: |
914 | serge | 113 | ; inc [queue_cnt] |
114 | ; DEBUGF 1, "K : queue (%u)\n", [queue_cnt] |
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1 | ha | 115 | push ebx |
116 | shl ebx, 1 |
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117 | add ebx, queueList ; eax now holds address of queue entry |
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118 | mov [ebx], word NO_BUFFER ; This buffer will be the last |
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119 | |||
120 | cli |
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121 | shl eax, 1 |
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122 | add eax, queues ; eax now holds address of queue |
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123 | movzx ebx, word [eax] |
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124 | |||
125 | cmp bx, NO_BUFFER |
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126 | jne qu_001 |
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127 | |||
128 | pop ebx |
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129 | ; The list is empty, so add this to the head |
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130 | mov [eax], bx |
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131 | jmp qu_exit |
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132 | |||
133 | qu_001: |
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134 | ; Find the last entry |
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135 | shl ebx, 1 |
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136 | add ebx, queueList |
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137 | mov eax, ebx |
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138 | movzx ebx, word [ebx] |
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139 | cmp bx, NO_BUFFER |
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140 | jne qu_001 |
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141 | |||
142 | mov ebx, eax |
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143 | pop eax |
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144 | mov [ebx], ax |
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145 | |||
146 | qu_exit: |
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147 | sti |
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148 | ret |
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149 | |||
150 | |||
151 | |||
152 | ;*************************************************************************** |
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153 | ; Function |
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154 | ; dequeue |
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155 | ; |
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156 | ; Description |
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157 | ; removes a buffer number from the head of a queue |
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158 | ; This is fast, as it unlinks the first entry in the list |
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159 | ; queue number in eax ( ms word zeroed ) |
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160 | ; buffer number returned in eax ( ms word zeroed ) |
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161 | ; all other registers preserved |
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162 | ; |
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163 | ;*************************************************************************** |
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914 | serge | 164 | uglobal |
165 | dequeue_cnt dd ? |
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166 | endg |
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1 | ha | 167 | dequeue: |
168 | push ebx |
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169 | shl eax, 1 |
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170 | add eax, queues ; eax now holds address of queue |
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171 | mov ebx, eax |
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172 | cli |
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173 | movzx eax, word [eax] |
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174 | cmp ax, NO_BUFFER |
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175 | je dq_exit |
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914 | serge | 176 | ; inc [dequeue_cnt] |
177 | ; DEBUGF 1, "K : dequeue (%u)\n", [dequeue_cnt] |
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1 | ha | 178 | push eax |
179 | shl eax, 1 |
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180 | add eax, queueList ; eax now holds address of queue entry |
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181 | mov ax, [eax] |
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182 | mov [ebx], ax |
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183 | pop eax |
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184 | |||
185 | dq_exit: |
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186 | sti |
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187 | pop ebx |
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188 | ret |
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189 | |||
190 | |||
191 | ;*************************************************************************** |
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192 | ; Function |
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193 | ; queueInit |
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194 | ; |
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195 | ; Description |
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196 | ; Initialises the queues to empty, and creates the free queue |
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197 | ; list. |
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198 | ; |
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199 | ;*************************************************************************** |
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200 | queueInit: |
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201 | mov esi, queues |
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202 | mov ecx, NUMQUEUES |
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203 | mov ax, NO_BUFFER |
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204 | |||
205 | qi001: |
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206 | mov [esi], ax |
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207 | inc esi |
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208 | inc esi |
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209 | loop qi001 |
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210 | |||
211 | mov esi, queues + ( 2 * EMPTY_QUEUE ) |
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212 | |||
213 | ; Initialise empty queue list |
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214 | |||
215 | xor ax, ax |
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216 | mov [esi], ax |
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217 | |||
218 | mov ecx, NUMQUEUEENTRIES - 1 |
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219 | mov esi, queueList |
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220 | |||
221 | qi002: |
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222 | inc ax |
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223 | mov [esi], ax |
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224 | inc esi |
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225 | inc esi |
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226 | loop qi002 |
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227 | |||
228 | mov ax, NO_BUFFER |
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229 | mov [esi], ax |
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230 | |||
231 | ret |