FreeBSD/Linux Kernel Cross Reference
sys/i386/include/psl.h

     /*-
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)psl.h 5.2 (Berkeley) 1/18/91
     * $FreeBSD: releng/6.0/sys/i386/include/psl.h 128019 2004-04-07 20:46:16Z imp $
     */
    
    #ifndef _MACHINE_PSL_H_
    #define _MACHINE_PSL_H_
    
    /*
     * 386 processor status longword.
     */
    #define PSL_C           0x00000001      /* carry bit */
    #define PSL_PF          0x00000004      /* parity bit */
    #define PSL_AF          0x00000010      /* bcd carry bit */
    #define PSL_Z           0x00000040      /* zero bit */
    #define PSL_N           0x00000080      /* negative bit */
    #define PSL_T           0x00000100      /* trace enable bit */
    #define PSL_I           0x00000200      /* interrupt enable bit */
    #define PSL_D           0x00000400      /* string instruction direction bit */
    #define PSL_V           0x00000800      /* overflow bit */
    #define PSL_IOPL        0x00003000      /* i/o privilege level */
    #define PSL_NT          0x00004000      /* nested task bit */
    #define PSL_RF          0x00010000      /* resume flag bit */
    #define PSL_VM          0x00020000      /* virtual 8086 mode bit */
    #define PSL_AC          0x00040000      /* alignment checking */
    #define PSL_VIF         0x00080000      /* virtual interrupt enable */
    #define PSL_VIP         0x00100000      /* virtual interrupt pending */
    #define PSL_ID          0x00200000      /* identification bit */
    
    /*
     * The i486 manual says that we are not supposed to change reserved flags,
     * but this is too much trouble since the reserved flags depend on the cpu
     * and setting them to their historical values works in practice.
     */
    #define PSL_RESERVED_DEFAULT    0x00000002
    
    /*
     * Initial flags for kernel and user mode.  The kernel later inherits
     * PSL_I and some other flags from user mode.
     */
    #define PSL_KERNEL      PSL_RESERVED_DEFAULT
    #define PSL_USER        (PSL_RESERVED_DEFAULT | PSL_I)
    
    /*
     * Bits that can be changed in user mode on 486's.  We allow these bits
     * to be changed using ptrace(), sigreturn() and procfs.  Setting PS_NT
     * is undesirable but it may as well be allowed since users can inflict
     * it on the kernel directly.  Changes to PSL_AC are silently ignored on
     * 386's.
     */
    #define PSL_USERCHANGE (PSL_C | PSL_PF | PSL_AF | PSL_Z | PSL_N | PSL_T \
                            | PSL_D | PSL_V | PSL_NT | PSL_AC | PSL_ID)
    
    #endif /* !_MACHINE_PSL_H_ */

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