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Diffstat (limited to 'sys/i386/include/specialreg.h')
| -rw-r--r-- | sys/i386/include/specialreg.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/sys/i386/include/specialreg.h b/sys/i386/include/specialreg.h new file mode 100644 index 000000000000..d1908c9371b6 --- /dev/null +++ b/sys/i386/include/specialreg.h @@ -0,0 +1,67 @@ +/*- + * 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. + * + * @(#)specialreg.h 7.1 (Berkeley) 5/9/91 + * + * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE + * -------------------- ----- ---------------------- + * CURRENT PATCH LEVEL: 1 00154 + * -------------------- ----- ---------------------- + * + * 20 Apr 93 Bruce Evans New npx-0.5 code + * + */ + +/* + * 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 |