The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/eflags.h

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    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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