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/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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.
*
* from: @(#)pte.h 5.5 (Berkeley) 5/9/91
* $Id$
*/
/*
* 386 page table entry and page table directory
* W.Jolitz, 8/89
*
* There are two major kinds of pte's: those which have ever existed (and are
* thus either now in core or on the swap device), and those which have
* never existed, but which will be filled on demand at first reference.
* There is a structure describing each. There is also an ancillary
* structure used in page clustering.
*/
#ifndef LOCORE
struct pde
{
unsigned int
pd_v:1, /* valid bit */
pd_prot:2, /* access control */
pd_mbz1:2, /* reserved, must be zero */
pd_u:1, /* hardware maintained 'used' bit */
:1, /* not used */
pd_mbz2:2, /* reserved, must be zero */
:3, /* reserved for software */
pd_pfnum:20; /* physical page frame number of pte's*/
};
struct pte
{
unsigned int
pg_v:1, /* valid bit */
pg_prot:2, /* access control */
pg_mbz1:2, /* reserved, must be zero */
pg_u:1, /* hardware maintained 'used' bit */
pg_m:1, /* hardware maintained modified bit */
pg_mbz2:2, /* reserved, must be zero */
pg_fod:1, /* is fill on demand (=0) */
:1, /* must write back to swap (unused) */
pg_nc:1, /* 'uncacheable page' bit */
pg_pfnum:20; /* physical page frame number */
};
struct hpte
{
unsigned int
pg_high:12, /* special for clustering */
pg_pfnum:20;
};
struct fpte
{
unsigned int
pg_v:1, /* valid bit */
pg_prot:2, /* access control */
:5,
pg_fileno:1, /* file mapped from or TEXT or ZERO */
pg_fod:1, /* is fill on demand (=1) */
pg_blkno:22; /* file system block number */
};
#endif
#define PD_MASK 0xffc00000 /* page directory address bits */
#define PD_SHIFT 22 /* page directory address bits */
#define PG_V 0x00000001
#define PG_PROT 0x00000006 /* all protection bits . */
#define PG_FOD 0x00000200
#define PG_SWAPM 0x00000400
#define PG_N 0x00000800 /* Non-cacheable */
#define PG_M 0x00000040
#define PG_U 0x00000020 /* not currently used */
#define PG_FRAME 0xfffff000
#define PG_FZERO 0
#define PG_FTEXT 1
#define PG_FMAX (PG_FTEXT)
#define PG_NOACC 0
#define PG_KR 0x00000000
#define PG_KW 0x00000002
#define PG_URKR 0x00000004
#define PG_URKW 0x00000004
#define PG_UW 0x00000006
/*
* Page Protection Exception bits
*/
#define PGEX_P 0x01 /* Protection violation vs. not present */
#define PGEX_W 0x02 /* during a Write cycle */
#define PGEX_U 0x04 /* access from User mode (UPL) */
/*
* Pte related macros
*/
#define dirty(pte) ((pte)->pg_m)
#ifndef LOCORE
#ifdef KERNEL
/* utilities defined in pmap.c */
extern struct pte *Sysmap;
#endif
#endif
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