psl.h revision 13765
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 * 3. All advertising materials mentioning features or use of this software 174Srgrimes * must display the following acknowledgement: 184Srgrimes * This product includes software developed by the University of 194Srgrimes * California, Berkeley and its contributors. 204Srgrimes * 4. Neither the name of the University nor the names of its contributors 214Srgrimes * may be used to endorse or promote products derived from this software 224Srgrimes * without specific prior written permission. 234Srgrimes * 244Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 254Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 264Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 274Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 284Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 294Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 304Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 314Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 324Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 334Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 344Srgrimes * SUCH DAMAGE. 354Srgrimes * 36621Srgrimes * from: @(#)psl.h 5.2 (Berkeley) 1/18/91 3713765Smpp * $Id: psl.h,v 1.6 1995/01/14 13:20:25 bde Exp $ 384Srgrimes */ 394Srgrimes 40719Swollman#ifndef _MACHINE_PSL_H_ 415603Sbde#define _MACHINE_PSL_H_ 42719Swollman 434Srgrimes/* 444Srgrimes * 386 processor status longword. 454Srgrimes */ 464Srgrimes#define PSL_C 0x00000001 /* carry bit */ 474Srgrimes#define PSL_PF 0x00000004 /* parity bit */ 484Srgrimes#define PSL_AF 0x00000010 /* bcd carry bit */ 494Srgrimes#define PSL_Z 0x00000040 /* zero bit */ 504Srgrimes#define PSL_N 0x00000080 /* negative bit */ 514Srgrimes#define PSL_T 0x00000100 /* trace enable bit */ 524Srgrimes#define PSL_I 0x00000200 /* interrupt enable bit */ 534Srgrimes#define PSL_D 0x00000400 /* string instruction direction bit */ 544Srgrimes#define PSL_V 0x00000800 /* overflow bit */ 555603Sbde#define PSL_IOPL 0x00003000 /* i/o privilege level */ 564Srgrimes#define PSL_NT 0x00004000 /* nested task bit */ 575603Sbde#define PSL_RF 0x00010000 /* resume flag bit */ 584Srgrimes#define PSL_VM 0x00020000 /* virtual 8086 mode bit */ 591998Swollman#define PSL_AC 0x00040000 /* alignment checking */ 601998Swollman#define PSL_VIF 0x00080000 /* virtual interrupt enable */ 611998Swollman#define PSL_VIP 0x00100000 /* virtual interrupt pending */ 621998Swollman#define PSL_ID 0x00200000 /* identification bit */ 634Srgrimes 645603Sbde/* 655603Sbde * The i486 manual says that we are not supposed to change reserved flags, 665603Sbde * but this is too much trouble since the reserved flags depend on the cpu 675603Sbde * and setting them to their historical values works in practice. 685603Sbde */ 695603Sbde#define PSL_RESERVED_DEFAULT 0x00000002 704Srgrimes 715603Sbde/* 725603Sbde * Initial flags for kernel and user mode. The kernel later inherits 735603Sbde * PSL_I and some other flags from user mode. 745603Sbde */ 755603Sbde#define PSL_KERNEL PSL_RESERVED_DEFAULT 765603Sbde#define PSL_USER (PSL_RESERVED_DEFAULT | PSL_I) 775603Sbde 785603Sbde/* 795603Sbde * Bits that can be changed in user mode on 486's. We allow these bits 805603Sbde * to be changed using ptrace(), sigreturn() and procfs. Setting PS_NT 8113765Smpp * is undesirable but it may as well be allowed since users can inflict 825603Sbde * it on the kernel directly. Changes to PSL_AC are silently ignored on 835603Sbde * 386's. 845603Sbde */ 855603Sbde#define PSL_USERCHANGE (PSL_C | PSL_PF | PSL_AF | PSL_Z | PSL_N | PSL_T \ 865603Sbde | PSL_D | PSL_V | PSL_NT | PSL_AC) 875603Sbde 885603Sbde#endif /* !_MACHINE_PSL_H_ */ 89