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