1*d0b3c59bSPatrick Mooney /*- 2*d0b3c59bSPatrick Mooney * Copyright (c) 1990 The Regents of the University of California. 3*d0b3c59bSPatrick Mooney * All rights reserved. 4*d0b3c59bSPatrick Mooney * 5*d0b3c59bSPatrick Mooney * This code is derived from software contributed to Berkeley by 6*d0b3c59bSPatrick Mooney * William Jolitz. 7*d0b3c59bSPatrick Mooney * 8*d0b3c59bSPatrick Mooney * Redistribution and use in source and binary forms, with or without 9*d0b3c59bSPatrick Mooney * modification, are permitted provided that the following conditions 10*d0b3c59bSPatrick Mooney * are met: 11*d0b3c59bSPatrick Mooney * 1. Redistributions of source code must retain the above copyright 12*d0b3c59bSPatrick Mooney * notice, this list of conditions and the following disclaimer. 13*d0b3c59bSPatrick Mooney * 2. Redistributions in binary form must reproduce the above copyright 14*d0b3c59bSPatrick Mooney * notice, this list of conditions and the following disclaimer in the 15*d0b3c59bSPatrick Mooney * documentation and/or other materials provided with the distribution. 16*d0b3c59bSPatrick Mooney * 4. Neither the name of the University nor the names of its contributors 17*d0b3c59bSPatrick Mooney * may be used to endorse or promote products derived from this software 18*d0b3c59bSPatrick Mooney * without specific prior written permission. 19*d0b3c59bSPatrick Mooney * 20*d0b3c59bSPatrick Mooney * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21*d0b3c59bSPatrick Mooney * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22*d0b3c59bSPatrick Mooney * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23*d0b3c59bSPatrick Mooney * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24*d0b3c59bSPatrick Mooney * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25*d0b3c59bSPatrick Mooney * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26*d0b3c59bSPatrick Mooney * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27*d0b3c59bSPatrick Mooney * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28*d0b3c59bSPatrick Mooney * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29*d0b3c59bSPatrick Mooney * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30*d0b3c59bSPatrick Mooney * SUCH DAMAGE. 31*d0b3c59bSPatrick Mooney * 32*d0b3c59bSPatrick Mooney * from: @(#)psl.h 5.2 (Berkeley) 1/18/91 33*d0b3c59bSPatrick Mooney * $FreeBSD: head/sys/x86/include/psl.h 258135 2013-11-14 15:37:20Z emaste $ 34*d0b3c59bSPatrick Mooney */ 35*d0b3c59bSPatrick Mooney 36*d0b3c59bSPatrick Mooney #ifndef _MACHINE_PSL_H_ 37*d0b3c59bSPatrick Mooney #define _MACHINE_PSL_H_ 38*d0b3c59bSPatrick Mooney 39*d0b3c59bSPatrick Mooney /* 40*d0b3c59bSPatrick Mooney * 386 processor status longword. 41*d0b3c59bSPatrick Mooney */ 42*d0b3c59bSPatrick Mooney #define PSL_C 0x00000001 /* carry bit */ 43*d0b3c59bSPatrick Mooney #define PSL_PF 0x00000004 /* parity bit */ 44*d0b3c59bSPatrick Mooney #define PSL_AF 0x00000010 /* bcd carry bit */ 45*d0b3c59bSPatrick Mooney #define PSL_Z 0x00000040 /* zero bit */ 46*d0b3c59bSPatrick Mooney #define PSL_N 0x00000080 /* negative bit */ 47*d0b3c59bSPatrick Mooney #define PSL_T 0x00000100 /* trace enable bit */ 48*d0b3c59bSPatrick Mooney #define PSL_I 0x00000200 /* interrupt enable bit */ 49*d0b3c59bSPatrick Mooney #define PSL_D 0x00000400 /* string instruction direction bit */ 50*d0b3c59bSPatrick Mooney #define PSL_V 0x00000800 /* overflow bit */ 51*d0b3c59bSPatrick Mooney #define PSL_IOPL 0x00003000 /* i/o privilege level */ 52*d0b3c59bSPatrick Mooney #define PSL_NT 0x00004000 /* nested task bit */ 53*d0b3c59bSPatrick Mooney #define PSL_RF 0x00010000 /* resume flag bit */ 54*d0b3c59bSPatrick Mooney #define PSL_VM 0x00020000 /* virtual 8086 mode bit */ 55*d0b3c59bSPatrick Mooney #define PSL_AC 0x00040000 /* alignment checking */ 56*d0b3c59bSPatrick Mooney #define PSL_VIF 0x00080000 /* virtual interrupt enable */ 57*d0b3c59bSPatrick Mooney #define PSL_VIP 0x00100000 /* virtual interrupt pending */ 58*d0b3c59bSPatrick Mooney #define PSL_ID 0x00200000 /* identification bit */ 59*d0b3c59bSPatrick Mooney 60*d0b3c59bSPatrick Mooney /* 61*d0b3c59bSPatrick Mooney * The i486 manual says that we are not supposed to change reserved flags, 62*d0b3c59bSPatrick Mooney * but this is too much trouble since the reserved flags depend on the cpu 63*d0b3c59bSPatrick Mooney * and setting them to their historical values works in practice. 64*d0b3c59bSPatrick Mooney */ 65*d0b3c59bSPatrick Mooney #define PSL_RESERVED_DEFAULT 0x00000002 66*d0b3c59bSPatrick Mooney 67*d0b3c59bSPatrick Mooney /* 68*d0b3c59bSPatrick Mooney * Initial flags for kernel and user mode. The kernel later inherits 69*d0b3c59bSPatrick Mooney * PSL_I and some other flags from user mode. 70*d0b3c59bSPatrick Mooney */ 71*d0b3c59bSPatrick Mooney #define PSL_KERNEL PSL_RESERVED_DEFAULT 72*d0b3c59bSPatrick Mooney #define PSL_USER (PSL_RESERVED_DEFAULT | PSL_I) 73*d0b3c59bSPatrick Mooney 74*d0b3c59bSPatrick Mooney /* 75*d0b3c59bSPatrick Mooney * Bits that can be changed in user mode on 486's. We allow these bits 76*d0b3c59bSPatrick Mooney * to be changed using ptrace(), sigreturn() and procfs. Setting PS_NT 77*d0b3c59bSPatrick Mooney * is undesirable but it may as well be allowed since users can inflict 78*d0b3c59bSPatrick Mooney * it on the kernel directly. Changes to PSL_AC are silently ignored on 79*d0b3c59bSPatrick Mooney * 386's. 80*d0b3c59bSPatrick Mooney * 81*d0b3c59bSPatrick Mooney * Users are allowed to change the privileged flag PSL_RF. The cpu sets PSL_RF 82*d0b3c59bSPatrick Mooney * in tf_eflags for faults. Debuggers should sometimes set it there too. 83*d0b3c59bSPatrick Mooney * tf_eflags is kept in the signal context during signal handling and there is 84*d0b3c59bSPatrick Mooney * no other place to remember it, so the PSL_RF bit may be corrupted by the 85*d0b3c59bSPatrick Mooney * signal handler without us knowing. Corruption of the PSL_RF bit at worst 86*d0b3c59bSPatrick Mooney * causes one more or one less debugger trap, so allowing it is fairly 87*d0b3c59bSPatrick Mooney * harmless. 88*d0b3c59bSPatrick Mooney */ 89*d0b3c59bSPatrick Mooney #define PSL_USERCHANGE (PSL_C | PSL_PF | PSL_AF | PSL_Z | PSL_N | PSL_T \ 90*d0b3c59bSPatrick Mooney | PSL_D | PSL_V | PSL_NT | PSL_RF | PSL_AC | PSL_ID) 91*d0b3c59bSPatrick Mooney 92*d0b3c59bSPatrick Mooney #endif /* !_MACHINE_PSL_H_ */ 93