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1 | \ ========== Copyright Header Begin ========================================== |
2 | \ | |
3 | \ Hypervisor Software File: receive.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: @(#)receive.fth 2.10 02/08/22 | |
43 | purpose: Interface between IP protocol layer and network driver | |
44 | copyright: Copyright 1990-2002 Sun Microsystems, Inc. All Rights Reserved | |
45 | copyright: Use is subject to license terms. | |
46 | ||
47 | \ Interface between IP protocol layer and network driver | |
48 | ||
49 | headerless | |
50 | ||
51 | 0 instance value ethernet-max | |
52 | instance variable *buffer | |
53 | 0 *buffer ! | |
54 | instance variable buffer-use-cnt \ Number of modules using *buffer | |
55 | ||
56 | : bufadr,len ( -- adr len ) *buffer @ ethernet-max ; | |
57 | ||
58 | : reserve-buffer ( -- ) | |
59 | *buffer @ 0= if | |
60 | " max-frame-size" get-inherited-property 0= if | |
61 | decode-int nip nip | |
62 | else | |
63 | d# 1518 \ 6 srcadr + 6 dstadr + 2 type + 1500 data + 4 crc | |
64 | then to ethernet-max | |
65 | ethernet-max alloc-mem *buffer ! | |
66 | then | |
67 | 1 buffer-use-cnt +! | |
68 | ; | |
69 | ||
70 | : release-buffer ( -- ) | |
71 | -1 buffer-use-cnt +! | |
72 | buffer-use-cnt @ 0= if | |
73 | bufadr,len free-mem | |
74 | 0 *buffer ! | |
75 | then | |
76 | ; | |
77 | ||
78 | \ non-zero if something good came in, <= ethernet-max | |
79 | : receive ( -- len ) | |
80 | bufadr,len " read" $call-parent ( -2 | actual-len ) | |
81 | 0 max | |
82 | ; | |
83 | ||
84 | \ len' is number of bytes sent | |
85 | : transmit ( len -- len' ) *buffer @ swap " write" $call-parent ; | |
86 | ||
87 | headers |