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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1990 The Regents of the University of California.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * William Jolitz.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      from: @(#)psl.h 5.2 (Berkeley) 1/18/91
   35  * $FreeBSD: releng/12.0/sys/x86/include/psl.h 326023 2017-11-20 19:43:44Z pfg $
   36  */
   37 
   38 #ifndef _MACHINE_PSL_H_
   39 #define _MACHINE_PSL_H_
   40 
   41 /*
   42  * 386 processor status longword.
   43  */
   44 #define PSL_C           0x00000001      /* carry bit */
   45 #define PSL_PF          0x00000004      /* parity bit */
   46 #define PSL_AF          0x00000010      /* bcd carry bit */
   47 #define PSL_Z           0x00000040      /* zero bit */
   48 #define PSL_N           0x00000080      /* negative bit */
   49 #define PSL_T           0x00000100      /* trace enable bit */
   50 #define PSL_I           0x00000200      /* interrupt enable bit */
   51 #define PSL_D           0x00000400      /* string instruction direction bit */
   52 #define PSL_V           0x00000800      /* overflow bit */
   53 #define PSL_IOPL        0x00003000      /* i/o privilege level */
   54 #define PSL_NT          0x00004000      /* nested task bit */
   55 #define PSL_RF          0x00010000      /* resume flag bit */
   56 #define PSL_VM          0x00020000      /* virtual 8086 mode bit */
   57 #define PSL_AC          0x00040000      /* alignment checking */
   58 #define PSL_VIF         0x00080000      /* virtual interrupt enable */
   59 #define PSL_VIP         0x00100000      /* virtual interrupt pending */
   60 #define PSL_ID          0x00200000      /* identification bit */
   61 
   62 /*
   63  * The i486 manual says that we are not supposed to change reserved flags,
   64  * but this is too much trouble since the reserved flags depend on the cpu
   65  * and setting them to their historical values works in practice.
   66  */
   67 #define PSL_RESERVED_DEFAULT    0x00000002
   68 
   69 /*
   70  * Initial flags for kernel and user mode.  The kernel later inherits
   71  * PSL_I and some other flags from user mode.
   72  */
   73 #define PSL_KERNEL      PSL_RESERVED_DEFAULT
   74 #define PSL_USER        (PSL_RESERVED_DEFAULT | PSL_I)
   75 
   76 /*
   77  * Bits that can be changed in user mode on 486's.  We allow these bits
   78  * to be changed using ptrace(), sigreturn() and procfs.  Setting PS_NT
   79  * is undesirable but it may as well be allowed since users can inflict
   80  * it on the kernel directly.  Changes to PSL_AC are silently ignored on
   81  * 386's.
   82  *
   83  * Users are allowed to change the privileged flag PSL_RF.  The cpu sets PSL_RF
   84  * in tf_eflags for faults.  Debuggers should sometimes set it there too.
   85  * tf_eflags is kept in the signal context during signal handling and there is
   86  * no other place to remember it, so the PSL_RF bit may be corrupted by the
   87  * signal handler without us knowing.  Corruption of the PSL_RF bit at worst
   88  * causes one more or one less debugger trap, so allowing it is fairly
   89  * harmless.   
   90  */
   91 #define PSL_USERCHANGE (PSL_C | PSL_PF | PSL_AF | PSL_Z | PSL_N | PSL_T \
   92                         | PSL_D | PSL_V | PSL_NT | PSL_RF | PSL_AC | PSL_ID)
   93 
   94 #endif /* !_MACHINE_PSL_H_ */

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