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/x86/include/psl.h

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)psl.h 5.2 (Berkeley) 1/18/91
   33  * $FreeBSD: releng/11.1/sys/x86/include/psl.h 258135 2013-11-14 15:37:20Z emaste $
   34  */
   35 
   36 #ifndef _MACHINE_PSL_H_
   37 #define _MACHINE_PSL_H_
   38 
   39 /*
   40  * 386 processor status longword.
   41  */
   42 #define PSL_C           0x00000001      /* carry bit */
   43 #define PSL_PF          0x00000004      /* parity bit */
   44 #define PSL_AF          0x00000010      /* bcd carry bit */
   45 #define PSL_Z           0x00000040      /* zero bit */
   46 #define PSL_N           0x00000080      /* negative bit */
   47 #define PSL_T           0x00000100      /* trace enable bit */
   48 #define PSL_I           0x00000200      /* interrupt enable bit */
   49 #define PSL_D           0x00000400      /* string instruction direction bit */
   50 #define PSL_V           0x00000800      /* overflow bit */
   51 #define PSL_IOPL        0x00003000      /* i/o privilege level */
   52 #define PSL_NT          0x00004000      /* nested task bit */
   53 #define PSL_RF          0x00010000      /* resume flag bit */
   54 #define PSL_VM          0x00020000      /* virtual 8086 mode bit */
   55 #define PSL_AC          0x00040000      /* alignment checking */
   56 #define PSL_VIF         0x00080000      /* virtual interrupt enable */
   57 #define PSL_VIP         0x00100000      /* virtual interrupt pending */
   58 #define PSL_ID          0x00200000      /* identification bit */
   59 
   60 /*
   61  * The i486 manual says that we are not supposed to change reserved flags,
   62  * but this is too much trouble since the reserved flags depend on the cpu
   63  * and setting them to their historical values works in practice.
   64  */
   65 #define PSL_RESERVED_DEFAULT    0x00000002
   66 
   67 /*
   68  * Initial flags for kernel and user mode.  The kernel later inherits
   69  * PSL_I and some other flags from user mode.
   70  */
   71 #define PSL_KERNEL      PSL_RESERVED_DEFAULT
   72 #define PSL_USER        (PSL_RESERVED_DEFAULT | PSL_I)
   73 
   74 /*
   75  * Bits that can be changed in user mode on 486's.  We allow these bits
   76  * to be changed using ptrace(), sigreturn() and procfs.  Setting PS_NT
   77  * is undesirable but it may as well be allowed since users can inflict
   78  * it on the kernel directly.  Changes to PSL_AC are silently ignored on
   79  * 386's.
   80  *
   81  * Users are allowed to change the privileged flag PSL_RF.  The cpu sets PSL_RF
   82  * in tf_eflags for faults.  Debuggers should sometimes set it there too.
   83  * tf_eflags is kept in the signal context during signal handling and there is
   84  * no other place to remember it, so the PSL_RF bit may be corrupted by the
   85  * signal handler without us knowing.  Corruption of the PSL_RF bit at worst
   86  * causes one more or one less debugger trap, so allowing it is fairly
   87  * harmless.   
   88  */
   89 #define PSL_USERCHANGE (PSL_C | PSL_PF | PSL_AF | PSL_Z | PSL_N | PSL_T \
   90                         | PSL_D | PSL_V | PSL_NT | PSL_RF | PSL_AC | PSL_ID)
   91 
   92 #endif /* !_MACHINE_PSL_H_ */

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