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Annotation of Net2/arch/i386/include/specialreg.h, revision 1.1.1.2

1.1       root        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:  *
1.1.1.2 ! root       33:  *     from: @(#)specialreg.h  7.1 (Berkeley) 5/9/91
        !            34:  *     specialreg.h,v 1.3 1993/05/22 08:00:38 cgd Exp
1.1       root       35:  */
                     36: 
                     37: /*
1.1.1.2 ! root       38:  * Bits in 386 special registers:
1.1       root       39:  */
                     40: 
                     41: #define        CR0_PE  0x00000001      /* Protected mode Enable */
1.1.1.2 ! root       42: #define        CR0_MP  0x00000002      /* "Math" Present (NPX or NPX emulator) */
        !            43: #ifdef notused
        !            44: #define        CR0_EM  0x00000004      /* EMulate non-NPX coproc. (trap ESC only) */
        !            45: #endif
        !            46: #define        CR0_TS  0x00000008      /* Task Switched (if MP, trap ESC and WAIT) */
        !            47: #ifdef notused
        !            48: #define        CR0_ET  0x00000010      /* Extension Type (387 (if set) vs 287) */
        !            49: #endif
        !            50: #define        CR0_PG  0x80000000      /* PaGing enable */
        !            51: 
        !            52: /*
        !            53:  * Bits in 486 special registers:
        !            54:  */
        !            55: 
        !            56: #define CR0_NE 0x00000020      /* Numeric Error enable (EX16 vs IRQ13) */
        !            57: #define CR0_WP 0x00010000      /* Write Protect (honor ~PG_W in all modes) */
        !            58: #ifdef notyet
        !            59: #define CR0_AM 0x00040000      /* Alignment Mask (set to enable AC flag) */
        !            60: #endif

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