Annotation of OpenXM_contrib/gnuplot/ctrl87.c, Revision 1.1.1.2
1.1.1.2 ! maekawa 1: /* $Id: ctrl87.c,v 1.1.1.2 1998/04/15 19:22:16 lhecking Exp $ */
1.1 maekawa 2:
3:
4: /* GNUPLOT - ctrl87.c */
5:
6: /*[
7: * Copyright 1986 - 1993, 1998 Thomas Williams, Colin Kelley
8: *
9: * Permission to use, copy, and distribute this software and its
10: * documentation for any purpose with or without fee is hereby granted,
11: * provided that the above copyright notice appear in all copies and
12: * that both that copyright notice and this permission notice appear
13: * in supporting documentation.
14: *
15: * Permission to modify the software is granted, but not the right to
16: * distribute the complete modified source code. Modifications are to
17: * be distributed as patches to the released version. Permission to
18: * distribute binaries produced by compiling modified sources is granted,
19: * provided you
20: * 1. distribute the corresponding source modifications from the
21: * released version in the form of a patch file along with the binaries,
22: * 2. add special version identification to distinguish your version
23: * in addition to the base release version number,
24: * 3. provide your name and address as the primary contact for the
25: * support of your modified version, and
26: * 4. retain our contact information in regard to use of the base
27: * software.
28: * Permission to distribute the released version of the source code along
29: * with corresponding source modifications in the form of a patch file is
30: * granted with same provisions 2 through 4 for binary distributions.
31: *
32: * This software is provided "as is" without express or implied warranty
33: * to the extent permitted by applicable law.
34: ]*/
35:
36:
37: #define __CONTROL87_C__
38:
39:
40: #include "ctrl87.h"
41:
42:
43: /***** _control87 *****/
44: unsigned short _control87(unsigned short newcw, unsigned short mask)
45: {
46: unsigned short cw;
47:
48: asm volatile(" \n\
49: wait \n\
50: fstcw %0 "
51: : /* outputs */ "=g" (cw)
52: : /* inputs */
53: );
54:
55: if(mask) { /* mask is not 0 */
56: asm volatile(" \n\
57: mov %2, %%ax \n\
58: mov %3, %%bx \n\
59: and %%bx, %%ax \n\
60: not %%bx \n\
61: nop \n\
62: wait \n\
63: mov %1, %%dx \n\
64: and %%bx, %%dx \n\
65: or %%ax, %%dx \n\
66: mov %%dx, %0 \n\
67: wait \n\
68: fldcw %1 "
69: : /* outputs */ "=g" (cw)
70: : /* inputs */ "g" (cw), "g" (newcw), "g" (mask)
71: : /* registers */ "ax", "bx", "dx"
72: );
73: }
74:
75: return cw;
76: } /* _control87 */
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