[unix-history] / sys / i386 / include / pte.h

/*-
 * 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
Commit	Line	Data
15637ed4 RG	1	/*-
	2	* Copyright (c) 1990 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* William Jolitz.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. Neither the name of the University nor the names of its contributors
	21	* may be used to endorse or promote products derived from this software
	22	* without specific prior written permission.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	* SUCH DAMAGE.
	35	*
db11a0e0 RG	36	* from: @(#)pte.h 5.5 (Berkeley) 5/9/91
db11a0e0 RG	37	* $Id$
15637ed4 RG	38	*/
	39
	40	/*
	41	* 386 page table entry and page table directory
	42	* W.Jolitz, 8/89
	43	*
	44	* There are two major kinds of pte's: those which have ever existed (and are
	45	* thus either now in core or on the swap device), and those which have
	46	* never existed, but which will be filled on demand at first reference.
	47	* There is a structure describing each. There is also an ancillary
	48	* structure used in page clustering.
	49	*/
	50
	51	#ifndef LOCORE
	52	struct pde
	53	{
	54	unsigned int
	55	pd_v:1, /* valid bit */
	56	pd_prot:2, /* access control */
	57	pd_mbz1:2, /* reserved, must be zero */
	58	pd_u:1, /* hardware maintained 'used' bit */
	59	:1, /* not used */
	60	pd_mbz2:2, /* reserved, must be zero */
	61	:3, /* reserved for software */
	62	pd_pfnum:20; /* physical page frame number of pte's*/
	63	};
	64	struct pte
	65	{
	66	unsigned int
	67	pg_v:1, /* valid bit */
	68	pg_prot:2, /* access control */
	69	pg_mbz1:2, /* reserved, must be zero */
	70	pg_u:1, /* hardware maintained 'used' bit */
	71	pg_m:1, /* hardware maintained modified bit */
	72	pg_mbz2:2, /* reserved, must be zero */
	73	pg_fod:1, /* is fill on demand (=0) */
	74	:1, /* must write back to swap (unused) */
	75	pg_nc:1, /* 'uncacheable page' bit */
	76	pg_pfnum:20; /* physical page frame number */
	77	};
	78	struct hpte
	79	{
	80	unsigned int
	81	pg_high:12, /* special for clustering */
	82	pg_pfnum:20;
	83	};
	84	struct fpte
	85	{
	86	unsigned int
	87	pg_v:1, /* valid bit */
	88	pg_prot:2, /* access control */
	89	:5,
	90	pg_fileno:1, /* file mapped from or TEXT or ZERO */
	91	pg_fod:1, /* is fill on demand (=1) */
	92	pg_blkno:22; /* file system block number */
	93	};
	94	#endif
	95
	96	#define PD_MASK 0xffc00000 /* page directory address bits */
	97	#define PD_SHIFT 22 /* page directory address bits */
	98
	99	#define PG_V 0x00000001
	100	#define PG_PROT 0x00000006 /* all protection bits . */
	101	#define PG_FOD 0x00000200
102	#define PG_SWAPM 0x00000400
103	#define PG_N 0x00000800 /* Non-cacheable */
104	#define PG_M 0x00000040
105	#define PG_U 0x00000020 /* not currently used */
106	#define PG_FRAME 0xfffff000
107
108	#define PG_FZERO 0
109	#define PG_FTEXT 1
110	#define PG_FMAX (PG_FTEXT)
111
112	#define PG_NOACC 0
113	#define PG_KR 0x00000000
114	#define PG_KW 0x00000002
115	#define PG_URKR 0x00000004
116	#define PG_URKW 0x00000004
117	#define PG_UW 0x00000006
118
119	/*
120	* Page Protection Exception bits
121	*/
122
123	#define PGEX_P 0x01 /* Protection violation vs. not present */
124	#define PGEX_W 0x02 /* during a Write cycle */
125	#define PGEX_U 0x04 /* access from User mode (UPL) */
126
127	/*
128	* Pte related macros
129	*/
130	#define dirty(pte) ((pte)->pg_m)
131
132	#ifndef LOCORE
133	#ifdef KERNEL
134	/* utilities defined in pmap.c */
135	extern struct pte *Sysmap;
136	#endif
137	#endif