1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)specialreg.h 8.1 (Berkeley) 06/11/93 8 */ 9 10 /* 11 * 386 Special registers: 12 */ 13 14 #define CR0_PE 0x00000001 /* Protected mode Enable */ 15 #define CR0_MP 0x00000002 /* "Math" Present (e.g. npx), wait for it */ 16 #define CR0_EM 0x00000004 /* EMulate NPX, e.g. trap, don't execute code */ 17 #define CR0_TS 0x00000008 /* Process has done Task Switch, do NPX save */ 18 #define CR0_ET 0x00000010 /* 32 bit (if set) vs 16 bit (387 vs 287) */ 19 #define CR0_PG 0x80000000 /* Paging Enable */ 20