104 lines
3.9 KiB
C
104 lines
3.9 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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: @(#)pte.h 5.5 (Berkeley) 5/9/91
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* $Id: pte.h,v 1.6 1994/10/09 13:23:21 mycroft Exp $
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*/
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/*
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* 386 page table entry and page table directory
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* W.Jolitz, 8/89
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*
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* There are two major kinds of pte's: those which have ever existed (and are
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* thus either now in core or on the swap device), and those which have
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* never existed, but which will be filled on demand at first reference.
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* There is a structure describing each. There is also an ancillary
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* structure used in page clustering.
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*/
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#ifndef _I386_PTE_H_
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#define _I386_PTE_H_
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#define PDSHIFT 22 /* LOG2(NBPDR) */
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#define NBPD (1 << PDSHIFT) /* bytes/page dir */
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#define PDOFSET (NBPD-1) /* byte offset into page dir */
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#define NPTEPD (NBPD / NBPG)
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#ifndef LOCORE
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typedef int pd_entry_t; /* page directory entry */
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typedef int pt_entry_t; /* Mach page table entry */
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#endif
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#define PD_MASK 0xffc00000 /* page directory address bits */
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#define PT_MASK 0x003ff000 /* page table address bits */
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#define PG_V 0x00000001 /* present */
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#define PG_RO 0x00000000 /* read-only by user (and kernel if 486) */
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#define PG_RW 0x00000002 /* read-write by user */
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#define PG_u 0x00000004 /* accessible by user */
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#define PG_PROT 0x00000006 /* all protection bits */
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#define PG_N 0x00000018 /* non-cacheable */
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#define PG_U 0x00000020 /* has been used */
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#define PG_M 0x00000040 /* has been modified */
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#define PG_W 0x00000200 /* page is wired */
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#define PG_FRAME 0xfffff000 /* page frame mask */
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#define PG_FZERO 0
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#define PG_FTEXT 1
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#define PG_FMAX (PG_FTEXT)
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#define PG_NOACC 0
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#define PG_KR 0x00000000
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#define PG_KW 0x00000002
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#define PG_URKR 0x00000004
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#define PG_URKW 0x00000004
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#define PG_UW 0x00000006
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/*
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* Page Protection Exception bits
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*/
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#define PGEX_P 0x01 /* Protection violation vs. not present */
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#define PGEX_W 0x02 /* during a Write cycle */
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#define PGEX_U 0x04 /* access from User mode (UPL) */
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#ifndef LOCORE
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#ifdef KERNEL
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/* utilities defined in pmap.c */
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extern pt_entry_t *Sysmap;
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#endif
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#endif
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#endif /* _I386_PTE_H_ */
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