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1 | \ ========== Copyright Header Begin ========================================== |
2 | \ | |
3 | \ Hypervisor Software File: bitops.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 | \ bitops.fth 2.2 90/09/03 | |
43 | \ Copyright 1985-1990 Bradley Forthware | |
44 | ||
45 | \ id bitops.fth 1.1 88/06/02 | |
46 | ||
47 | code bitset ( bit# array -- ) | |
48 | \ Adr in tos | |
49 | sp scr pop \ Bit# in scr | |
50 | h# 80 sc1 move \ Mask | |
51 | scr 7 sc2 and \ Bit Shift count | |
52 | scr 3 sc4 srl \ Byte offset in sc4 | |
53 | tos sc4 sc3 ldub \ Get the byte | |
54 | sc1 sc2 sc1 srl \ Interesting bit in sc1 | |
55 | sc1 sc3 sc3 or \ Set the appropriate bit | |
56 | sc3 tos sc4 stb \ Put the byte back | |
57 | sp tos pop \ Clean up stack | |
58 | c; | |
59 | code bitclear ( bit# array -- ) | |
60 | \ Adr in tos | |
61 | sp scr pop \ Bit# in scr | |
62 | h# 80 sc1 move \ Mask | |
63 | scr 7 sc2 and \ Bit Shift count | |
64 | scr 3 sc4 srl \ Byte offset in sc4 | |
65 | tos sc4 sc3 ldub \ Get the byte | |
66 | sc1 sc2 sc1 srl \ Interesting bit in sc1 | |
67 | sc3 sc1 sc3 andn \ Clear the appropriate bit | |
68 | sc3 tos sc4 stb \ Put the byte back | |
69 | sp tos pop \ Clean up stack | |
70 | c; | |
71 | code bittest ( bit# array -- flag ) | |
72 | \ Adr in tos | |
73 | sp scr pop \ Bit# in scr | |
74 | h# 80 sc1 move \ Mask | |
75 | scr 7 sc2 and \ Bit Shift count | |
76 | scr 3 sc4 srl \ Byte offset in sc4 | |
77 | tos sc4 sc3 ldub \ Get the byte | |
78 | sc1 sc2 sc1 srl \ Interesting bit in sc1 | |
79 | sc1 sc3 sc3 andcc \ Clear the appropriate bit | |
80 | 0<> if | |
81 | false tos move \ Expect false (delay slot) | |
82 | true tos move \ True | |
83 | then | |
84 | c; |