pmap.h revision 1.4 
1/*	$NetBSD: pmap.h,v 1.4 1995/11/23 02:36:25 cgd Exp $	*/
2
3/*
4 * Copyright (c) 1987 Carnegie-Mellon University
5 * Copyright (c) 1991, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 *    must display the following acknowledgement:
22 *	This product includes software developed by the University of
23 *	California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 *	@(#)pmap.h	8.1 (Berkeley) 6/10/93
41 */
42
43#ifndef	_PMAP_MACHINE_
44#define	_PMAP_MACHINE_
45
46#include <machine/pte.h>
47
48#define	ALPHA_PAGE_SIZE	NBPG
49#define	ALPHA_SEG_SIZE	NBSEG
50
51#define alpha_trunc_seg(x)	(((u_long)(x)) & ~(ALPHA_SEG_SIZE-1))
52#define alpha_round_seg(x)	alpha_trunc_seg((u_long)(x) + ALPHA_SEG_SIZE-1)
53
54/*
55 * Pmap stuff
56 */
57struct pmap {
58	pt_entry_t		*pm_ptab;	/* KVA of page table */
59	pt_entry_t		*pm_stab;	/* KVA of segment table */
60	int			pm_stchanged;	/* ST changed */
61	pt_entry_t		pm_stpte;	/* PTE mapping STE */
62	short			pm_sref;	/* segment table ref count */
63	short			pm_count;	/* pmap reference count */
64	simple_lock_data_t	pm_lock;	/* lock on pmap */
65	struct pmap_statistics	pm_stats;	/* pmap statistics */
66	long			pm_ptpages;	/* more stats: PT pages */
67};
68
69typedef struct pmap	*pmap_t;
70
71extern struct pmap	kernel_pmap_store;
72
73#define pmap_kernel()	(&kernel_pmap_store)
74#define	active_pmap(pm) \
75	((pm) == pmap_kernel() || (pm) == curproc->p_vmspace->vm_map.pmap)
76
77/*
78 * Macros for speed
79 */
80#define PMAP_ACTIVATE(pmapp, iscurproc)					\
81	if ((pmapp) != NULL && (pmapp)->pm_stchanged) {			\
82		if (iscurproc)						\
83			loadustp((pmapp)->pm_stpte);			\
84		(pmapp)->pm_stchanged = FALSE;				\
85	}
86#define PMAP_DEACTIVATE(pmapp, pcbp)
87
88/*
89 * For each vm_page_t, there is a list of all currently valid virtual
90 * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
91 */
92typedef struct pv_entry {
93	struct pv_entry	*pv_next;	/* next pv_entry */
94	struct pmap	*pv_pmap;	/* pmap where mapping lies */
95	vm_offset_t	pv_va;		/* virtual address for mapping */
96	pt_entry_t	*pv_ptpte;	/* non-zero if VA maps a PT page */
97	struct pmap	*pv_ptpmap;	/* if pv_ptpte, pmap for PT page */
98	int		pv_flags;	/* flags */
99} *pv_entry_t;
100
101#define PV_PTPAGE	0x01	/* header: entry maps a page table page */
102
103/*
104 * bits of pmap_attributes[]
105 */
106#define	PMAP_ATTR_MOD	0x01			/* modified */
107#define	PMAP_ATTR_REF	0x02			/* referenced */
108
109#ifdef _KERNEL
110pv_entry_t	pv_table;		/* array of entries, one per page */
111
112#define pa_index(pa)		atop(pa - vm_first_phys)
113#define pa_to_pvh(pa)		(&pv_table[pa_index(pa)])
114
115#define	pmap_resident_count(pmap)	((pmap)->pm_stats.resident_count)
116#define	pmap_wired_count(pmap)		((pmap)->pm_stats.wired_count)
117
118extern	pt_entry_t *Sysmap;
119extern	char *vmmap;			/* map for mem, dumps, etc. */
120
121/* Machine-specific functions. */
122void	pmap_emulate_reference __P((struct proc *p, vm_offset_t v,
123		int user, int write));
124#endif /* _KERNEL */
125
126#endif /* _PMAP_MACHINE_ */
127