1*199767f8SToomas Soome /*- 2*199767f8SToomas Soome * Copyright (c) 1990 The Regents of the University of California. 3*199767f8SToomas Soome * All rights reserved. 4*199767f8SToomas Soome * 5*199767f8SToomas Soome * This code is derived from software contributed to Berkeley by 6*199767f8SToomas Soome * William Jolitz. 7*199767f8SToomas Soome * 8*199767f8SToomas Soome * Redistribution and use in source and binary forms, with or without 9*199767f8SToomas Soome * modification, are permitted provided that the following conditions 10*199767f8SToomas Soome * are met: 11*199767f8SToomas Soome * 1. Redistributions of source code must retain the above copyright 12*199767f8SToomas Soome * notice, this list of conditions and the following disclaimer. 13*199767f8SToomas Soome * 2. Redistributions in binary form must reproduce the above copyright 14*199767f8SToomas Soome * notice, this list of conditions and the following disclaimer in the 15*199767f8SToomas Soome * documentation and/or other materials provided with the distribution. 16*199767f8SToomas Soome * 4. Neither the name of the University nor the names of its contributors 17*199767f8SToomas Soome * may be used to endorse or promote products derived from this software 18*199767f8SToomas Soome * without specific prior written permission. 19*199767f8SToomas Soome * 20*199767f8SToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21*199767f8SToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22*199767f8SToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23*199767f8SToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24*199767f8SToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25*199767f8SToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26*199767f8SToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27*199767f8SToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28*199767f8SToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29*199767f8SToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30*199767f8SToomas Soome * SUCH DAMAGE. 31*199767f8SToomas Soome * 32*199767f8SToomas Soome * from: @(#)psl.h 5.2 (Berkeley) 1/18/91 33*199767f8SToomas Soome * $FreeBSD$ 34*199767f8SToomas Soome */ 35*199767f8SToomas Soome 36*199767f8SToomas Soome #ifndef _MACHINE_PSL_H_ 37*199767f8SToomas Soome #define _MACHINE_PSL_H_ 38*199767f8SToomas Soome 39*199767f8SToomas Soome /* 40*199767f8SToomas Soome * 386 processor status longword. 41*199767f8SToomas Soome */ 42*199767f8SToomas Soome #define PSL_C 0x00000001 /* carry bit */ 43*199767f8SToomas Soome #define PSL_PF 0x00000004 /* parity bit */ 44*199767f8SToomas Soome #define PSL_AF 0x00000010 /* bcd carry bit */ 45*199767f8SToomas Soome #define PSL_Z 0x00000040 /* zero bit */ 46*199767f8SToomas Soome #define PSL_N 0x00000080 /* negative bit */ 47*199767f8SToomas Soome #define PSL_T 0x00000100 /* trace enable bit */ 48*199767f8SToomas Soome #define PSL_I 0x00000200 /* interrupt enable bit */ 49*199767f8SToomas Soome #define PSL_D 0x00000400 /* string instruction direction bit */ 50*199767f8SToomas Soome #define PSL_V 0x00000800 /* overflow bit */ 51*199767f8SToomas Soome #define PSL_IOPL 0x00003000 /* i/o privilege level */ 52*199767f8SToomas Soome #define PSL_NT 0x00004000 /* nested task bit */ 53*199767f8SToomas Soome #define PSL_RF 0x00010000 /* resume flag bit */ 54*199767f8SToomas Soome #define PSL_VM 0x00020000 /* virtual 8086 mode bit */ 55*199767f8SToomas Soome #define PSL_AC 0x00040000 /* alignment checking */ 56*199767f8SToomas Soome #define PSL_VIF 0x00080000 /* virtual interrupt enable */ 57*199767f8SToomas Soome #define PSL_VIP 0x00100000 /* virtual interrupt pending */ 58*199767f8SToomas Soome #define PSL_ID 0x00200000 /* identification bit */ 59*199767f8SToomas Soome 60*199767f8SToomas Soome /* 61*199767f8SToomas Soome * The i486 manual says that we are not supposed to change reserved flags, 62*199767f8SToomas Soome * but this is too much trouble since the reserved flags depend on the cpu 63*199767f8SToomas Soome * and setting them to their historical values works in practice. 64*199767f8SToomas Soome */ 65*199767f8SToomas Soome #define PSL_RESERVED_DEFAULT 0x00000002 66*199767f8SToomas Soome 67*199767f8SToomas Soome /* 68*199767f8SToomas Soome * Initial flags for kernel and user mode. The kernel later inherits 69*199767f8SToomas Soome * PSL_I and some other flags from user mode. 70*199767f8SToomas Soome */ 71*199767f8SToomas Soome #define PSL_KERNEL PSL_RESERVED_DEFAULT 72*199767f8SToomas Soome #define PSL_USER (PSL_RESERVED_DEFAULT | PSL_I) 73*199767f8SToomas Soome 74*199767f8SToomas Soome /* 75*199767f8SToomas Soome * Bits that can be changed in user mode on 486's. We allow these bits 76*199767f8SToomas Soome * to be changed using ptrace(), sigreturn() and procfs. Setting PS_NT 77*199767f8SToomas Soome * is undesirable but it may as well be allowed since users can inflict 78*199767f8SToomas Soome * it on the kernel directly. Changes to PSL_AC are silently ignored on 79*199767f8SToomas Soome * 386's. 80*199767f8SToomas Soome * 81*199767f8SToomas Soome * Users are allowed to change the privileged flag PSL_RF. The cpu sets PSL_RF 82*199767f8SToomas Soome * in tf_eflags for faults. Debuggers should sometimes set it there too. 83*199767f8SToomas Soome * tf_eflags is kept in the signal context during signal handling and there is 84*199767f8SToomas Soome * no other place to remember it, so the PSL_RF bit may be corrupted by the 85*199767f8SToomas Soome * signal handler without us knowing. Corruption of the PSL_RF bit at worst 86*199767f8SToomas Soome * causes one more or one less debugger trap, so allowing it is fairly 87*199767f8SToomas Soome * harmless. 88*199767f8SToomas Soome */ 89*199767f8SToomas Soome #define PSL_USERCHANGE (PSL_C | PSL_PF | PSL_AF | PSL_Z | PSL_N | PSL_T \ 90*199767f8SToomas Soome | PSL_D | PSL_V | PSL_NT | PSL_RF | PSL_AC | PSL_ID) 91*199767f8SToomas Soome 92*199767f8SToomas Soome #endif /* !_MACHINE_PSL_H_ */ 93