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1 | \ ========== Copyright Header Begin ========================================== |
2 | \ | |
3 | \ Hypervisor Software File: tcpbuf.fth | |
4 | \ | |
5 | \ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. | |
6 | \ | |
7 | \ - Do no alter or remove copyright notices | |
8 | \ | |
9 | \ - Redistribution and use of this software in source and binary forms, with | |
10 | \ or without modification, are permitted provided that the following | |
11 | \ conditions are met: | |
12 | \ | |
13 | \ - Redistribution of source code must retain the above copyright notice, | |
14 | \ this list of conditions and the following disclaimer. | |
15 | \ | |
16 | \ - Redistribution in binary form must reproduce the above copyright notice, | |
17 | \ this list of conditions and the following disclaimer in the | |
18 | \ documentation and/or other materials provided with the distribution. | |
19 | \ | |
20 | \ Neither the name of Sun Microsystems, Inc. or the names of contributors | |
21 | \ may be used to endorse or promote products derived from this software | |
22 | \ without specific prior written permission. | |
23 | \ | |
24 | \ This software is provided "AS IS," without a warranty of any kind. | |
25 | \ ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, | |
26 | \ INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A | |
27 | \ PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN | |
28 | \ MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR | |
29 | \ ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR | |
30 | \ DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN | |
31 | \ OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR | |
32 | \ FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE | |
33 | \ DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, | |
34 | \ ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF | |
35 | \ SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. | |
36 | \ | |
37 | \ You acknowledge that this software is not designed, licensed or | |
38 | \ intended for use in the design, construction, operation or maintenance of | |
39 | \ any nuclear facility. | |
40 | \ | |
41 | \ ========== Copyright Header End ============================================ | |
42 | id: @(#)tcpbuf.fth 1.1 04/09/07 | |
43 | purpose: TCP buffer management routines | |
44 | copyright: Copyright 2004 Sun Microsystems, Inc. All Rights Reserved | |
45 | copyright: Use is subject to license terms. | |
46 | ||
47 | \ TCP's send and receive buffers are maintained as circular buffers. | |
48 | \ The buffer sizes reflect the corresponding initial window sizes. | |
49 | \ Sequence space computations are translated into corresponding buffer | |
50 | \ addresses when accessing data. | |
51 | ||
52 | headerless | |
53 | ||
54 | struct | |
55 | /n field >tcpbuf-adr \ Pointer to buffer | |
56 | /l field >tcpbuf-size \ Buffer size | |
57 | /l field >tcpbuf-start \ Offset to start of valid data | |
58 | /l field >tcpbuf-count \ Data character count | |
59 | constant /tcp-buffer | |
60 | ||
61 | : tcpbuf-adr@ ( tcpbuf -- adr ) >tcpbuf-adr @ ; | |
62 | : tcpbuf-size@ ( tcpbuf -- size ) >tcpbuf-size l@ ; | |
63 | ||
64 | : tcpbuf-count@ ( tcpbuf -- n ) >tcpbuf-count l@ ; | |
65 | : tcpbuf-count! ( n tcpbuf -- ) >tcpbuf-count l! ; | |
66 | ||
67 | : tcpbuf-count+! ( tcpbuf n -- ) | |
68 | over tcpbuf-count@ + swap tcpbuf-count! | |
69 | ; | |
70 | ||
71 | : tcpbuf-start@ ( tcpbuf -- offset ) >tcpbuf-start l@ ; | |
72 | : tcpbuf-start! ( offset tcpbuf -- ) >tcpbuf-start l! ; | |
73 | ||
74 | : tcpbuf-start+! ( tcpbuf n -- ) | |
75 | over tcpbuf-start@ + over tcpbuf-size@ mod swap tcpbuf-start! | |
76 | ; | |
77 | ||
78 | \ Get amount of free space in buffer. | |
79 | : tcpbuf-space@ ( tcpbuf -- n ) | |
80 | dup tcpbuf-size@ swap tcpbuf-count@ - | |
81 | ; | |
82 | ||
83 | \ Allocate a TCP buffer. | |
84 | : tcpbuf-init ( tcpbuf bufsize -- ) | |
85 | 2dup alloc-mem swap >tcpbuf-adr ! | |
86 | over >tcpbuf-size l! | |
87 | 0 over >tcpbuf-start l! | |
88 | 0 swap >tcpbuf-count l! | |
89 | ; | |
90 | ||
91 | \ Free TCP buffer resources. | |
92 | : tcpbuf-free ( tcpbuf -- ) | |
93 | dup tcpbuf-adr@ swap tcpbuf-size@ free-mem | |
94 | ; | |
95 | ||
96 | \ Convert offset from start of valid data in the buffer to an index | |
97 | \ from start of the buffer. | |
98 | : tcpbuf-offset>adrindex ( tcpbuf offset -- index ) | |
99 | over tcpbuf-start@ + swap tcpbuf-size@ mod | |
100 | ; | |
101 | ||
102 | \ Copy 'len' bytes of data from 'adr' into the TCP buffer, starting at | |
103 | \ 'offset' bytes from the current start of valid data in the buffer, | |
104 | \ handling wraparounds as necessary. The actual amount of data copied | |
105 | \ is limited by the free space available in the buffer. | |
106 | ||
107 | : (tcpbuf-write) ( tcpbuf index adr len -- ) | |
108 | >r >r >r tcpbuf-adr@ r> ca+ r> swap r> move | |
109 | ; | |
110 | ||
111 | : tcpbuf-write ( tcpbuf offset adr len -- len' ) | |
112 | 3 pick tcpbuf-space@ min dup >r ( buf offset adr len' ) ( r: len' ) | |
113 | 2swap ( adr len' buf offset ) | |
114 | over swap tcpbuf-offset>adrindex ( adr len' buf index ) | |
115 | 2swap 2over ( buf index adr len' buf index ) | |
116 | swap tcpbuf-size@ swap - over min ( buf index adr len' n ) | |
117 | tuck - >r ( buf index adr n ) ( r: len' rem ) | |
118 | 2over 2over (tcpbuf-write) ( buf index adr n ) | |
119 | + nip 0 swap r> (tcpbuf-write) ( ) ( r: len' ) | |
120 | r> ( len' ) ( r: ) | |
121 | ; | |
122 | ||
123 | \ Copy 'len' bytes of data starting at 'offset' bytes from current | |
124 | \ start of valid data in the TCP buffer to the address at 'adr', | |
125 | \ handling buffer wraparounds as necessary. The actual amount of | |
126 | \ data read is limited by the amount of data at hand. | |
127 | ||
128 | : (tcpbuf-read) ( tcpbuf index adr len -- ) | |
129 | >r >r >r tcpbuf-adr@ r> ca+ r> r> move | |
130 | ; | |
131 | ||
132 | : tcpbuf-read ( tcpbuf offset adr len -- len' ) | |
133 | 3 pick tcpbuf-count@ min dup >r ( buf offset adr len' ) ( r: len' ) | |
134 | 2swap ( adr len' buf offset ) | |
135 | over swap tcpbuf-offset>adrindex ( adr len' buf index ) | |
136 | 2swap 2over ( buf index adr len' buf index ) | |
137 | swap tcpbuf-size@ swap - over min ( buf index adr len' n ) | |
138 | tuck - >r ( buf index adr n ) ( r: len' rem ) | |
139 | 2over 2over (tcpbuf-read) ( buf index adr n ) | |
140 | + nip 0 swap r> (tcpbuf-read) ( ) ( r: len' ) | |
141 | r> ( len' ) ( r: ) | |
142 | ; | |
143 | ||
144 | \ Discard n bytes from start of buffer. | |
145 | : tcpbuf-drop ( tcpbuf n -- ) | |
146 | over tcpbuf-count@ min 2dup tcpbuf-start+! negate tcpbuf-count+! | |
147 | ; | |
148 | ||
149 | headers |