14Srgrimes/*- 24Srgrimes * Copyright (c) 1990 The Regents of the University of California. 34Srgrimes * All rights reserved. 44Srgrimes * 54Srgrimes * This code is derived from software contributed to Berkeley by 64Srgrimes * William Jolitz. 74Srgrimes * 84Srgrimes * Redistribution and use in source and binary forms, with or without 94Srgrimes * modification, are permitted provided that the following conditions 104Srgrimes * are met: 114Srgrimes * 1. Redistributions of source code must retain the above copyright 124Srgrimes * notice, this list of conditions and the following disclaimer. 134Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 144Srgrimes * notice, this list of conditions and the following disclaimer in the 154Srgrimes * documentation and/or other materials provided with the distribution. 164Srgrimes * 4. Neither the name of the University nor the names of its contributors 174Srgrimes * may be used to endorse or promote products derived from this software 184Srgrimes * without specific prior written permission. 194Srgrimes * 204Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 214Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 224Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 234Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 244Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 254Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 264Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 274Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 284Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 294Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 304Srgrimes * SUCH DAMAGE. 314Srgrimes * 32621Srgrimes * from: @(#)psl.h 5.2 (Berkeley) 1/18/91 3350477Speter * $FreeBSD: releng/10.3/sys/x86/include/psl.h 258559 2013-11-25 15:58:48Z emaste $ 344Srgrimes */ 354Srgrimes 36719Swollman#ifndef _MACHINE_PSL_H_ 375603Sbde#define _MACHINE_PSL_H_ 38719Swollman 394Srgrimes/* 404Srgrimes * 386 processor status longword. 414Srgrimes */ 424Srgrimes#define PSL_C 0x00000001 /* carry bit */ 434Srgrimes#define PSL_PF 0x00000004 /* parity bit */ 444Srgrimes#define PSL_AF 0x00000010 /* bcd carry bit */ 454Srgrimes#define PSL_Z 0x00000040 /* zero bit */ 464Srgrimes#define PSL_N 0x00000080 /* negative bit */ 474Srgrimes#define PSL_T 0x00000100 /* trace enable bit */ 484Srgrimes#define PSL_I 0x00000200 /* interrupt enable bit */ 494Srgrimes#define PSL_D 0x00000400 /* string instruction direction bit */ 504Srgrimes#define PSL_V 0x00000800 /* overflow bit */ 515603Sbde#define PSL_IOPL 0x00003000 /* i/o privilege level */ 524Srgrimes#define PSL_NT 0x00004000 /* nested task bit */ 535603Sbde#define PSL_RF 0x00010000 /* resume flag bit */ 544Srgrimes#define PSL_VM 0x00020000 /* virtual 8086 mode bit */ 551998Swollman#define PSL_AC 0x00040000 /* alignment checking */ 561998Swollman#define PSL_VIF 0x00080000 /* virtual interrupt enable */ 571998Swollman#define PSL_VIP 0x00100000 /* virtual interrupt pending */ 581998Swollman#define PSL_ID 0x00200000 /* identification bit */ 594Srgrimes 605603Sbde/* 615603Sbde * The i486 manual says that we are not supposed to change reserved flags, 625603Sbde * but this is too much trouble since the reserved flags depend on the cpu 635603Sbde * and setting them to their historical values works in practice. 645603Sbde */ 655603Sbde#define PSL_RESERVED_DEFAULT 0x00000002 664Srgrimes 675603Sbde/* 685603Sbde * Initial flags for kernel and user mode. The kernel later inherits 695603Sbde * PSL_I and some other flags from user mode. 705603Sbde */ 715603Sbde#define PSL_KERNEL PSL_RESERVED_DEFAULT 725603Sbde#define PSL_USER (PSL_RESERVED_DEFAULT | PSL_I) 735603Sbde 745603Sbde/* 755603Sbde * Bits that can be changed in user mode on 486's. We allow these bits 765603Sbde * to be changed using ptrace(), sigreturn() and procfs. Setting PS_NT 7713765Smpp * is undesirable but it may as well be allowed since users can inflict 785603Sbde * it on the kernel directly. Changes to PSL_AC are silently ignored on 795603Sbde * 386's. 80258559Semaste * 81258559Semaste * Users are allowed to change the privileged flag PSL_RF. The cpu sets PSL_RF 82258559Semaste * in tf_eflags for faults. Debuggers should sometimes set it there too. 83258559Semaste * tf_eflags is kept in the signal context during signal handling and there is 84258559Semaste * no other place to remember it, so the PSL_RF bit may be corrupted by the 85258559Semaste * signal handler without us knowing. Corruption of the PSL_RF bit at worst 86258559Semaste * causes one more or one less debugger trap, so allowing it is fairly 87258559Semaste * harmless. 885603Sbde */ 895603Sbde#define PSL_USERCHANGE (PSL_C | PSL_PF | PSL_AF | PSL_Z | PSL_N | PSL_T \ 90258559Semaste | PSL_D | PSL_V | PSL_NT | PSL_RF | PSL_AC | PSL_ID) 915603Sbde 925603Sbde#endif /* !_MACHINE_PSL_H_ */ 93