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116 lines
4.4 KiB
C
116 lines
4.4 KiB
C
/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)specialreg.h 7.1 (Berkeley) 5/9/91
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* $Id: specialreg.h,v 1.8 1996/01/30 22:55:06 mpp Exp $
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*/
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#ifndef _MACHINE_SPECIALREG_H_
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#define _MACHINE_SPECIALREG_H_
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/*
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* Bits in 386 special registers:
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*/
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#define CR0_PE 0x00000001 /* Protected mode Enable */
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#define CR0_MP 0x00000002 /* "Math" Present (NPX or NPX emulator) */
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#ifdef notused
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#define CR0_EM 0x00000004 /* EMulate non-NPX coproc. (trap ESC only) */
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#endif
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#define CR0_TS 0x00000008 /* Task Switched (if MP, trap ESC and WAIT) */
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#ifdef notused
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#define CR0_ET 0x00000010 /* Extension Type (387 (if set) vs 287) */
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#endif
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#define CR0_PG 0x80000000 /* PaGing enable */
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/*
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* Bits in 486 special registers:
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*/
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#define CR0_NE 0x00000020 /* Numeric Error enable (EX16 vs IRQ13) */
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#define CR0_WP 0x00010000 /* Write Protect (honor page protect in all modes) */
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#define CR0_AM 0x00040000 /* Alignment Mask (set to enable AC flag) */
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#define CR0_NW 0x20000000 /* Not Write-through */
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#define CR0_CD 0x40000000 /* Cache Disable */
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/*
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* Cyrix 486 DLC special registers, accessible as IO ports.
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*/
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#define CCR0 0xc0 /* configuration control register 0 */
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#define CCR0_NC0 0x01 /* first 64K of each 1M memory region is
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non-cacheable */
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#define CCR0_NC1 0x02 /* 640K-1M region is non-cacheable */
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#define CCR0_A20M 0x04 /* enables A20M# input pin */
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#define CCR0_KEN 0x08 /* enables KEN# input pin */
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#define CCR0_FLUSH 0x10 /* enables FLUSH# input pin */
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#define CCR0_BARB 0x20 /* flushes internal cache when entering hold
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state */
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#define CCR0_CO 0x40 /* cache org: 1=direct mapped, 0=2x set assoc */
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#define CCR0_SUSPEND 0x80 /* enables SUSP# and SUSPA# pins */
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#define CCR1 0xc1 /* configuration control register 1 */
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#define CCR1_RPL 0x01 /* enables RPLSET and RPLVAL# pins */
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/* the remaining 7 bits of this register are reserved */
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/*
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* the following four 3-byte registers control the non-cacheable regions.
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* These registers must be written as three separate bytes.
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*
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* NCRx+0: A31-A24 of starting address
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* NCRx+1: A23-A16 of starting address
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* NCRx+2: A15-A12 of starting address | NCR_SIZE_xx.
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*
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* The non-cacheable region's starting address must be aligned to the
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* size indicated by the NCR_SIZE_xx field.
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*/
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#define NCR1 0xc4
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#define NCR2 0xc7
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#define NCR3 0xca
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#define NCR4 0xcd
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#define NCR_SIZE_0K 0
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#define NCR_SIZE_4K 1
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#define NCR_SIZE_8K 2
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#define NCR_SIZE_16K 3
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#define NCR_SIZE_32K 4
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#define NCR_SIZE_64K 5
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#define NCR_SIZE_128K 6
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#define NCR_SIZE_256K 7
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#define NCR_SIZE_512K 8
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#define NCR_SIZE_1M 9
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#define NCR_SIZE_2M 10
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#define NCR_SIZE_4M 11
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#define NCR_SIZE_8M 12
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#define NCR_SIZE_16M 13
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#define NCR_SIZE_32M 14
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#define NCR_SIZE_4G 15
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#endif /* !_MACHINE_SPECIALREG_H_ */
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