138 lines
4.4 KiB
C
138 lines
4.4 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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* $Id$
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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 LOCORE
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struct pde
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{
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unsigned int
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pd_v:1, /* valid bit */
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pd_prot:2, /* access control */
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pd_mbz1:2, /* reserved, must be zero */
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pd_u:1, /* hardware maintained 'used' bit */
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:1, /* not used */
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pd_mbz2:2, /* reserved, must be zero */
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:3, /* reserved for software */
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pd_pfnum:20; /* physical page frame number of pte's*/
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};
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struct pte
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{
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unsigned int
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pg_v:1, /* valid bit */
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pg_prot:2, /* access control */
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pg_mbz1:2, /* reserved, must be zero */
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pg_u:1, /* hardware maintained 'used' bit */
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pg_m:1, /* hardware maintained modified bit */
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pg_mbz2:2, /* reserved, must be zero */
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pg_fod:1, /* is fill on demand (=0) */
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:1, /* must write back to swap (unused) */
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pg_nc:1, /* 'uncacheable page' bit */
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pg_pfnum:20; /* physical page frame number */
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};
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struct hpte
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{
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unsigned int
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pg_high:12, /* special for clustering */
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pg_pfnum:20;
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};
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struct fpte
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{
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unsigned int
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pg_v:1, /* valid bit */
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pg_prot:2, /* access control */
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:5,
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pg_fileno:1, /* file mapped from or TEXT or ZERO */
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pg_fod:1, /* is fill on demand (=1) */
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pg_blkno:22; /* file system block number */
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};
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#endif
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#define PD_MASK 0xffc00000 /* page directory address bits */
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#define PD_SHIFT 22 /* page directory address bits */
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#define PG_V 0x00000001
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#define PG_PROT 0x00000006 /* all protection bits . */
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#define PG_FOD 0x00000200
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#define PG_SWAPM 0x00000400
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#define PG_N 0x00000800 /* Non-cacheable */
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#define PG_M 0x00000040
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#define PG_U 0x00000020 /* not currently used */
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#define PG_FRAME 0xfffff000
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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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/*
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* Pte related macros
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*/
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#define dirty(pte) ((pte)->pg_m)
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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 struct pte *Sysmap;
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#endif
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#endif
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