FreeBSD/Linux Kernel Cross Reference
sys/i386/eflags.h
1 /*
2 * Mach Operating System
3 * Copyright (c) 1991,1990,1989 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
25 */
26 /*
27 * HISTORY
28 * $Log: eflags.h,v $
29 * Revision 2.4 91/05/14 16:06:35 mrt
30 * Correcting copyright
31 *
32 * Revision 2.3 91/02/05 17:11:26 mrt
33 * Changed to new Mach copyright
34 * [91/02/01 17:31:41 mrt]
35 *
36 * Revision 2.2 90/05/03 15:25:03 dbg
37 * Created.
38 * [90/02/08 dbg]
39 *
40 */
41
42 #ifndef _I386_EFLAGS_H_
43 #define _I386_EFLAGS_H_
44
45 /*
46 * i386 flags register
47 */
48 #define EFL_CF 0x00000001 /* carry */
49 #define EFL_PF 0x00000004 /* parity of low 8 bits */
50 #define EFL_AF 0x00000010 /* carry out of bit 3 */
51 #define EFL_ZF 0x00000040 /* zero */
52 #define EFL_SF 0x00000080 /* sign */
53 #define EFL_TF 0x00000100 /* trace trap */
54 #define EFL_IF 0x00000200 /* interrupt enable */
55 #define EFL_DF 0x00000400 /* direction */
56 #define EFL_OF 0x00000800 /* overflow */
57 #define EFL_IOPL 0x00003000 /* IO privilege level: */
58 #define EFL_IOPL_KERNEL 0x00000000 /* kernel */
59 #define EFL_IOPL_USER 0x00003000 /* user */
60 #define EFL_NT 0x00004000 /* nested task */
61 #define EFL_RF 0x00010000 /* resume without tracing */
62 #define EFL_VM 0x00020000 /* virtual 8086 mode */
63
64 #define EFL_USER_SET (EFL_IF)
65 #define EFL_USER_CLEAR (EFL_IOPL|EFL_NT|EFL_RF)
66
67 #endif _I386_EFLAGS_H_
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