specialreg.h revision 719
1/*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)specialreg.h 7.1 (Berkeley) 5/9/91 34 * $Id: specialreg.h,v 1.2 1993/10/16 14:39:32 rgrimes Exp $ 35 */ 36 37#ifndef _MACHINE_SPECIALREG_H_ 38#define _MACHINE_SPECIALREG_H_ 1 39 40/* 41 * Bits in 386 special registers: 42 */ 43 44#define CR0_PE 0x00000001 /* Protected mode Enable */ 45#define CR0_MP 0x00000002 /* "Math" Present (NPX or NPX emulator) */ 46#ifdef notused 47#define CR0_EM 0x00000004 /* EMulate non-NPX coproc. (trap ESC only) */ 48#endif 49#define CR0_TS 0x00000008 /* Task Switched (if MP, trap ESC and WAIT) */ 50#ifdef notused 51#define CR0_ET 0x00000010 /* Extension Type (387 (if set) vs 287) */ 52#endif 53#define CR0_PG 0x80000000 /* PaGing enable */ 54 55/* 56 * Bits in 486 special registers: 57 */ 58 59#define CR0_NE 0x00000020 /* Numeric Error enable (EX16 vs IRQ13) */ 60#define CR0_WP 0x00010000 /* Write Protect (honor ~PG_W in all modes) */ 61#ifdef notyet 62#define CR0_AM 0x00040000 /* Alignment Mask (set to enable AC flag) */ 63#endif 64#endif /* _MACHINE_SPECIALREG_H_ */ 65