sys/i386/include/specialreg.h

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      from: @(#)specialreg.h  7.1 (Berkeley) 5/9/91
 *      $Id: specialreg.h,v 1.2 1993/10/16 14:39:32 rgrimes Exp $
 */

#ifndef _MACHINE_SPECIALREG_H_
#define _MACHINE_SPECIALREG_H_ 1

/*
 * Bits in 386 special registers:
 */

#define CR0_PE  0x00000001      /* Protected mode Enable */
#define CR0_MP  0x00000002      /* "Math" Present (NPX or NPX emulator) */
#ifdef notused
#define CR0_EM  0x00000004      /* EMulate non-NPX coproc. (trap ESC only) */
#endif
#define CR0_TS  0x00000008      /* Task Switched (if MP, trap ESC and WAIT) */
#ifdef notused
#define CR0_ET  0x00000010      /* Extension Type (387 (if set) vs 287) */
#endif
#define CR0_PG  0x80000000      /* PaGing enable */

/*
 * Bits in 486 special registers:
 */

#define CR0_NE  0x00000020      /* Numeric Error enable (EX16 vs IRQ13) */
#define CR0_WP  0x00010000      /* Write Protect (honor ~PG_W in all modes) */
#ifdef notyet
#define CR0_AM  0x00040000      /* Alignment Mask (set to enable AC flag) */
#endif
#endif /* _MACHINE_SPECIALREG_H_ */