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1 | \ ========== Copyright Header Begin ========================================== |
2 | \ | |
3 | \ Hypervisor Software File: uservars.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: @(#)uservars.fth 2.14 03/12/08 13:22:17 | |
43 | purpose: | |
44 | copyright: Copyright 1999-2003 Sun Microsystems, Inc. All Rights Reserved | |
45 | copyright: Copyright 1985-1994 Bradley Forthware | |
46 | copyright: Use is subject to license terms. | |
47 | ||
48 | decimal | |
49 | ||
50 | \ Initial user number | |
51 | ||
52 | [ifexist] #user-init | |
53 | #user-init | |
54 | [else] | |
55 | 0 | |
56 | [then] | |
57 | ||
58 | [ifndef] run-time | |
59 | \ First 5 user variables are used for multitasking | |
60 | dup user link \ link to next task | |
61 | /n + dup user entry \ entry address for this task | |
62 | /n + dup user saved-rp \ this is not MP safe | |
63 | /n + dup user saved-sp \ this is not MP safe | |
64 | [then] | |
65 | ||
66 | \ next 2 user variables are used for booting | |
67 | /n + dup user up0 \ initial up | |
68 | /n + dup user #user \ next available user location | |
69 | /n + #user-t ! | |
70 | ||
71 | /n constant #ualign | |
72 | : ualigned ( n -- n' ) #ualign round-up ; | |
73 | ||
74 | : (check-user-size) ( #bytes -- #bytes ) | |
75 | dup #user @ + user-size >= abort" ERROR: User area used up!" ( #bytes ) | |
76 | ; | |
77 | ||
78 | \ These will be altered later to enable user space to grow on demand: | |
79 | user-size-t value user-size | |
80 | defer check-user-size ' (check-user-size) is check-user-size | |
81 | ||
82 | : ualloc ( #bytes -- new-user-number ) \ allocates user space | |
83 | check-user-size | |
84 | \ If we are allocating fewer bytes than the alignment granularity, | |
85 | \ it is safe to assume that strict alignment is not required. | |
86 | \ For example, a 2-byte token doesn't have to be aligned on a 4-byte | |
87 | \ boundary. | |
88 | ( #bytes ) | |
89 | #user @ ( #bytes user# ) | |
90 | over #ualign >= if ualigned dup #user ! then ( #bytes user#' ) | |
91 | ||
92 | swap #user +! | |
93 | ; | |
94 | ||
95 | [ifndef] run-time | |
96 | : nuser \ name ( -- ) \ like user but automatically allocates space | |
97 | /n ualloc user | |
98 | ; | |
99 | : tuser \ name ( -- ) \ like user but automatically allocates space | |
100 | /token ualloc user | |
101 | ; | |
102 | : auser \ name ( -- ) \ like user but automatically allocates space | |
103 | /a ualloc user | |
104 | ; | |
105 | [then] | |
106 | ||
107 | nuser .sp0 \ initial parameter stack | |
108 | nuser .rp0 \ initial return stack | |
109 | ||
110 | defer sp0 ' .sp0 is sp0 \ MPsafe versions | |
111 | defer rp0 ' .rp0 is rp0 \ MPsafe versions | |
112 | ||
113 | headerless | |
114 | \ This is the beginning of the initialization chain | |
115 | chain: init ( -- ) up@ link ! ; \ Initially, only one task is active | |
116 | headers |