root / lab4 / .minix-src / include / x86 / pte.h @ 14
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| 1 | 13 | up20180614 | /* $NetBSD: pte.h,v 1.1 2010/07/06 20:50:35 cegger Exp $ */
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| 2 | |||
| 3 | /*
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| 4 | * Copyright (c) 2010 The NetBSD Foundation, Inc.
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to The NetBSD Foundation
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| 8 | * by Christoph Egger.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in the
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| 17 | * documentation and/or other materials provided with the distribution.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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| 29 | * POSSIBILITY OF SUCH DAMAGE.
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| 30 | */
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| 31 | |||
| 32 | #ifndef _X86_PTE_H
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| 33 | #define _X86_PTE_H
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| 34 | |||
| 35 | /* Cacheability bits when we are using PAT */
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| 36 | #define PGC_WB 0 /* The default */ |
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| 37 | #define PGC_WC PG_WT /* WT and CD is WC */ |
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| 38 | #define PGC_UCMINUS PG_N /* UC but mtrr can override */ |
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| 39 | #define PGC_UC (PG_WT | PG_N) /* hard UC */ |
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| 40 | |||
| 41 | /*
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| 42 | * page protection exception bits
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| 43 | */
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| 44 | |||
| 45 | #define PGEX_P 0x01 /* protection violation (vs. no mapping) */ |
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| 46 | #define PGEX_W 0x02 /* exception during a write cycle */ |
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| 47 | #define PGEX_U 0x04 /* exception while in user mode (upl) */ |
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| 48 | #define PGEX_X 0x10 /* exception during instruction fetch */ |
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| 49 | |||
| 50 | #endif /* _X86_PTE_H */ |