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1159 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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1514 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2010. All rights reserved. ;; |
1159 | hidnplayr | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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6 | ;; queue.inc ;; |
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7 | ;; ;; |
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8 | ;; Written by hidnplayr@kolibrios.org ;; |
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9 | ;; ;; |
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10 | ;; GNU GENERAL PUBLIC LICENSE ;; |
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11 | ;; Version 2, June 1991 ;; |
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12 | ;; ;; |
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13 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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14 | |||
1206 | hidnplayr | 15 | $Revision: 2305 $ |
1159 | hidnplayr | 16 | |
1514 | hidnplayr | 17 | ; The Queues implemented by these macros form a ring-buffer. |
1257 | hidnplayr | 18 | ; The data to these queue's always looks like this: |
19 | ; |
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20 | ; At top, you have the queue struct, wich has the size (number of currently queued packets, read and write pointers. |
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21 | ; This struct is followed by a number of slots wich you can read and write to using the macros. |
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22 | ; How these slots look like is up to you to chose, normally they should have at least a pointer to where the real data is. |
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23 | ; (you can see some examples below) |
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24 | |||
25 | |||
1159 | hidnplayr | 26 | struct queue |
2305 | hidnplayr | 27 | |
28 | size dd ? ; number of queued packets in this queue |
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29 | w_ptr dd ? ; current writing pointer in queue |
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30 | r_ptr dd ? ; current reading pointer |
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31 | |||
1159 | hidnplayr | 32 | ends |
33 | |||
1257 | hidnplayr | 34 | ; The following macros share these inputs: |
35 | |||
36 | ; ptr = pointer to where the queue data is located |
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37 | ; size = number of slots/entrys in the queue |
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38 | ; entry_size = size of one slot, in bytes |
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39 | ; failaddr = the address where macro will jump to when there is no data in the queue |
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40 | |||
41 | ; additionally, add_to_queue requires you to set esi to the data wich you want to queue |
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42 | ; get_from_queue on the other hand will return a pointer in esi, to the entry you're interessed in |
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43 | ; PS: macros WILL destroy ecx and edi |
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44 | |||
1249 | hidnplayr | 45 | macro add_to_queue ptr, size, entry_size, failaddr { |
1159 | hidnplayr | 46 | |
1257 | hidnplayr | 47 | cmp [ptr + queue.size], size ; Check if queue isnt full |
2300 | hidnplayr | 48 | jae failaddr |
1159 | hidnplayr | 49 | |
1257 | hidnplayr | 50 | inc [ptr + queue.size] ; if not full, queue one more |
1159 | hidnplayr | 51 | |
1257 | hidnplayr | 52 | mov edi, [ptr + queue.w_ptr] ; Current write pointer (FIFO!) |
1249 | hidnplayr | 53 | mov ecx, entry_size/4 ; Write the queue entry |
54 | rep movsd ; |
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1159 | hidnplayr | 55 | |
2305 | hidnplayr | 56 | lea ecx, [size*entry_size+ptr+sizeof.queue] |
1257 | hidnplayr | 57 | cmp edi, ecx ; entry size |
2300 | hidnplayr | 58 | jb .no_wrap |
1159 | hidnplayr | 59 | |
1249 | hidnplayr | 60 | sub edi, size*entry_size |
1159 | hidnplayr | 61 | |
62 | .no_wrap: |
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1249 | hidnplayr | 63 | mov [ptr + queue.w_ptr], edi |
1159 | hidnplayr | 64 | |
65 | } |
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66 | |||
67 | |||
68 | |||
1249 | hidnplayr | 69 | macro get_from_queue ptr, size, entry_size, failaddr { |
1159 | hidnplayr | 70 | |
1257 | hidnplayr | 71 | cmp [ptr + queue.size], 0 ; any packets queued? |
1249 | hidnplayr | 72 | je failaddr |
1159 | hidnplayr | 73 | |
1257 | hidnplayr | 74 | dec [ptr + queue.size] ; if so, dequeue one |
1159 | hidnplayr | 75 | |
76 | mov esi, [ptr + queue.r_ptr] |
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1249 | hidnplayr | 77 | push esi |
1159 | hidnplayr | 78 | |
1249 | hidnplayr | 79 | add esi, entry_size |
1159 | hidnplayr | 80 | |
2305 | hidnplayr | 81 | lea ecx, [size*entry_size+ptr+sizeof.queue] |
1257 | hidnplayr | 82 | cmp esi, ecx ; entry size |
2300 | hidnplayr | 83 | jb .no_wrap |
1159 | hidnplayr | 84 | |
1249 | hidnplayr | 85 | sub esi, size*entry_size |
1159 | hidnplayr | 86 | |
87 | .no_wrap: |
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88 | mov dword [ptr + queue.r_ptr], esi |
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89 | |||
1249 | hidnplayr | 90 | pop esi |
91 | |||
1159 | hidnplayr | 92 | } |
93 | |||
1257 | hidnplayr | 94 | macro init_queue ptr { |
1249 | hidnplayr | 95 | |
1257 | hidnplayr | 96 | mov [ptr + queue.size] , 0 |
2305 | hidnplayr | 97 | lea edi, [ptr + sizeof.queue] |
1257 | hidnplayr | 98 | mov [ptr + queue.w_ptr], edi |
99 | mov [ptr + queue.r_ptr], edi |
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1249 | hidnplayr | 100 | } |