specialreg.h revision 1.2
1 1.1 cgd /*- 2 1.1 cgd * Copyright (c) 1991 The Regents of the University of California. 3 1.1 cgd * All rights reserved. 4 1.1 cgd * 5 1.1 cgd * Redistribution and use in source and binary forms, with or without 6 1.1 cgd * modification, are permitted provided that the following conditions 7 1.1 cgd * are met: 8 1.1 cgd * 1. Redistributions of source code must retain the above copyright 9 1.1 cgd * notice, this list of conditions and the following disclaimer. 10 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 11 1.1 cgd * notice, this list of conditions and the following disclaimer in the 12 1.1 cgd * documentation and/or other materials provided with the distribution. 13 1.1 cgd * 3. All advertising materials mentioning features or use of this software 14 1.1 cgd * must display the following acknowledgement: 15 1.1 cgd * This product includes software developed by the University of 16 1.1 cgd * California, Berkeley and its contributors. 17 1.1 cgd * 4. Neither the name of the University nor the names of its contributors 18 1.1 cgd * may be used to endorse or promote products derived from this software 19 1.1 cgd * without specific prior written permission. 20 1.1 cgd * 21 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 1.1 cgd * SUCH DAMAGE. 32 1.1 cgd * 33 1.1 cgd * @(#)specialreg.h 7.1 (Berkeley) 5/9/91 34 1.1 cgd */ 35 1.1 cgd 36 1.1 cgd /* 37 1.2 deraadt * Bits in 386 special registers: 38 1.1 cgd */ 39 1.1 cgd 40 1.1 cgd #define CR0_PE 0x00000001 /* Protected mode Enable */ 41 1.2 deraadt #define CR0_MP 0x00000002 /* "Math" Present (NPX or NPX emulator) */ 42 1.2 deraadt #ifdef notused 43 1.2 deraadt #define CR0_EM 0x00000004 /* EMulate non-NPX coproc. (trap ESC only) */ 44 1.2 deraadt #endif 45 1.2 deraadt #define CR0_TS 0x00000008 /* Task Switched (if MP, trap ESC and WAIT) */ 46 1.2 deraadt #ifdef notused 47 1.2 deraadt #define CR0_ET 0x00000010 /* Extension Type (387 (if set) vs 287) */ 48 1.2 deraadt #endif 49 1.2 deraadt #define CR0_PG 0x80000000 /* PaGing enable */ 50 1.2 deraadt 51 1.2 deraadt /* 52 1.2 deraadt * Bits in 486 special registers: 53 1.2 deraadt */ 54 1.2 deraadt 55 1.2 deraadt #define CR0_NE 0x00000020 /* Numeric Error enable (EX16 vs IRQ13) */ 56 1.2 deraadt #define CR0_WP 0x00010000 /* Write Protect (honor ~PG_W in all modes) */ 57 1.2 deraadt #ifdef notyet 58 1.2 deraadt #define CR0_AM 0x00040000 /* Alignment Mask (set to enable AC flag) */ 59 1.2 deraadt #endif 60
Indexes created Mon Sep 29 15:09:53 GMT 2025