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specialreg.h revision 1.2 
      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  *	@(#)specialreg.h	7.1 (Berkeley) 5/9/91
     34  */
     35 
     36 /*
     37  * Bits in 386 special registers:
     38  */
     39 
     40 #define	CR0_PE	0x00000001	/* Protected mode Enable */
     41 #define	CR0_MP	0x00000002	/* "Math" Present (NPX or NPX emulator) */
     42 #ifdef notused
     43 #define	CR0_EM	0x00000004	/* EMulate non-NPX coproc. (trap ESC only) */
     44 #endif
     45 #define	CR0_TS	0x00000008	/* Task Switched (if MP, trap ESC and WAIT) */
     46 #ifdef notused
     47 #define	CR0_ET	0x00000010	/* Extension Type (387 (if set) vs 287) */
     48 #endif
     49 #define	CR0_PG	0x80000000	/* PaGing enable */
     50 
     51 /*
     52  * Bits in 486 special registers:
     53  */
     54 
     55 #define CR0_NE	0x00000020	/* Numeric Error enable (EX16 vs IRQ13) */
     56 #define CR0_WP	0x00010000	/* Write Protect (honor ~PG_W in all modes) */
     57 #ifdef notyet
     58 #define CR0_AM	0x00040000	/* Alignment Mask (set to enable AC flag) */
     59 #endif
     60