pmap.h revision 1.3 
1/*	$NetBSD: pmap.h,v 1.3 2000/09/21 17:46:05 thorpej 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	_NEWS68K_PMAP_H_
44#define	_NEWS68K_PMAP_H_
45
46#include <machine/cpu.h>
47#include <machine/pte.h>
48
49/*
50 * Pmap stuff
51 */
52struct pmap {
53	pt_entry_t		*pm_ptab;	/* KVA of page table */
54	st_entry_t		*pm_stab;	/* KVA of segment table */
55	int			pm_stfree;	/* 040: free lev2 blocks */
56	st_entry_t		*pm_stpa;	/* 040: ST phys addr */
57	short			pm_sref;	/* segment table ref count */
58	short			pm_count;	/* pmap reference count */
59	simple_lock_data_t	pm_lock;	/* lock on pmap */
60	struct pmap_statistics	pm_stats;	/* pmap statistics */
61	long			pm_ptpages;	/* more stats: PT pages */
62};
63
64typedef struct pmap	*pmap_t;
65
66/*
67 * On the 040 we keep track of which level 2 blocks are already in use
68 * with the pm_stfree mask.  Bits are arranged from LSB (block 0) to MSB
69 * (block 31).  For convenience, the level 1 table is considered to be
70 * block 0.
71 *
72 * MAX[KU]L2SIZE control how many pages of level 2 descriptors are allowed.
73 * for the kernel and users.  8 implies only the initial "segment table"
74 * page is used.  WARNING: don't change MAXUL2SIZE unless you can allocate
75 * physically contiguous pages for the ST in pmap.c!
76 */
77#define	MAXKL2SIZE	32
78#define MAXUL2SIZE	8
79#define l2tobm(n)	(1 << (n))
80#define	bmtol2(n)	(ffs(n) - 1)
81
82/*
83 * Macros for speed
84 */
85#define	PMAP_ACTIVATE(pmap, loadhw)					\
86{									\
87	if ((loadhw))							\
88		loadustp(m68k_btop((paddr_t)(pmap)->pm_stpa));		\
89}
90
91/*
92 * For each vm_page_t, there is a list of all currently valid virtual
93 * mappings of that page.  An entry is a pv_entry, the list is pv_table.
94 */
95struct pv_entry {
96	struct pv_entry	*pv_next;	/* next pv_entry */
97	struct pmap	*pv_pmap;	/* pmap where mapping lies */
98	vaddr_t		pv_va;		/* virtual address for mapping */
99	st_entry_t	*pv_ptste;	/* non-zero if VA maps a PT page */
100	struct pmap	*pv_ptpmap;	/* if pv_ptste, pmap for PT page */
101	int		pv_flags;	/* flags */
102};
103
104#define	PV_CI		0x01	/* header: all entries are cache inhibited */
105#define PV_PTPAGE	0x02	/* header: entry maps a page table page */
106
107struct pv_page;
108
109struct pv_page_info {
110	TAILQ_ENTRY(pv_page) pgi_list;
111	struct pv_entry *pgi_freelist;
112	int pgi_nfree;
113};
114
115/*
116 * This is basically:
117 * ((NBPG - sizeof(struct pv_page_info)) / sizeof(struct pv_entry))
118 */
119#define	NPVPPG	170
120
121struct pv_page {
122	struct pv_page_info pvp_pgi;
123	struct pv_entry pvp_pv[NPVPPG];
124};
125
126extern struct pmap	kernel_pmap_store;
127
128#define pmap_kernel()	(&kernel_pmap_store)
129#define	active_pmap(pm) \
130	((pm) == pmap_kernel() || (pm) == curproc->p_vmspace->vm_map.pmap)
131#define	active_user_pmap(pm) \
132	(curproc && \
133	 (pm) != pmap_kernel() && (pm) == curproc->p_vmspace->vm_map.pmap)
134
135extern struct pv_entry	*pv_table;	/* array of entries, one per page */
136
137#define pmap_page_index(pa)		atop(pa - vm_first_phys)
138#define	pmap_resident_count(pmap)	((pmap)->pm_stats.resident_count)
139#define	pmap_wired_count(pmap)		((pmap)->pm_stats.wired_count)
140
141extern pt_entry_t	*Sysmap;
142extern char		*vmmap;		/* map for mem, dumps, etc. */
143
144vaddr_t	pmap_map __P((vaddr_t, paddr_t, paddr_t, int));
145void	pmap_procwr __P((struct proc *, vaddr_t, u_long));
146#define	PMAP_NEED_PROCWR
147
148/*
149 * Do idle page zero'ing uncached to avoid polluting the cache.
150 */
151boolean_t pmap_zero_page_uncached __P((paddr_t));
152#define	PMAP_PAGEIDLEZERO(pa)	pmap_zero_page_uncached(pa)
153
154#ifdef CACHE_HAVE_VAC
155void	pmap_prefer __P((vaddr_t, vaddr_t *));
156#define	PMAP_PREFER(foff, vap)	pmap_prefer((foff), (vap))
157#endif
158
159#endif /* !_NEWS68K_PMAP_H_ */
160