| /*- |
| * 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 |
| * $FreeBSD$ |
| */ |
| |
| #ifndef _BSD_MACHINE_PSL_H_ |
| #define _BSD_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_FREEBSD_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 /* !_BSD_MACHINE_PSL_H_ */ |
