summaryrefslogtreecommitdiffstats
path: root/sys/vm/vm_page.h
blob: 8bf51469a1f68e89c4ca1f9bf67010e246ff7c2c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
/* 
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * The Mach Operating System project at Carnegie-Mellon University.
 *
 * 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.
 *
 *	@(#)vm_page.h	8.2 (Berkeley) 12/13/93
 *
 *
 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
 * 
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

/*
 *	Resident memory system definitions.
 */

#ifndef	_VM_PAGE_
#define	_VM_PAGE_

/*
 *	Management of resident (logical) pages.
 *
 *	A small structure is kept for each resident
 *	page, indexed by page number.  Each structure
 *	is an element of several lists:
 *
 *		A hash table bucket used to quickly
 *		perform object/offset lookups
 *
 *		A list of all pages for a given object,
 *		so they can be quickly deactivated at
 *		time of deallocation.
 *
 *		An ordered list of pages due for pageout.
 *
 *	In addition, the structure contains the object
 *	and offset to which this page belongs (for pageout),
 *	and sundry status bits.
 *
 *	Fields in this structure are locked either by the lock on the
 *	object that the page belongs to (O) or by the lock on the page
 *	queues (P).
 */

TAILQ_HEAD(pglist, vm_page);

struct vm_page {
	TAILQ_ENTRY(vm_page)	pageq;		/* queue info for FIFO
						 * queue or free list (P) */
	TAILQ_ENTRY(vm_page)	hashq;		/* hash table links (O)*/
	TAILQ_ENTRY(vm_page)	listq;		/* pages in same object (O)*/

	vm_object_t		object;		/* which object am I in (O,P)*/
	vm_offset_t		offset;		/* offset into object (O,P) */

	u_short			wire_count;	/* wired down maps refs (P) */
	u_short			flags;		/* see below */

	vm_offset_t		phys_addr;	/* physical address of page */
};

/*
 * These are the flags defined for vm_page.
 *
 * Note: PG_FILLED and PG_DIRTY are added for the filesystems.
 */
#define	PG_INACTIVE	0x0001		/* page is in inactive list (P) */
#define	PG_ACTIVE	0x0002		/* page is in active list (P) */
#define	PG_LAUNDRY	0x0004		/* page is being cleaned now (P)*/
#define	PG_CLEAN	0x0008		/* page has not been modified */
#define	PG_BUSY		0x0010		/* page is in transit (O) */
#define	PG_WANTED	0x0020		/* someone is waiting for page (O) */
#define	PG_TABLED	0x0040		/* page is in VP table (O) */
#define	PG_COPYONWRITE	0x0080		/* must copy page before changing (O) */
#define	PG_FICTITIOUS	0x0100		/* physical page doesn't exist (O) */
#define	PG_FAKE		0x0200		/* page is placeholder for pagein (O) */
#define	PG_FILLED	0x0400		/* client flag to set when filled */
#define	PG_DIRTY	0x0800		/* client flag to set when dirty */
#define	PG_PAGEROWNED	0x4000		/* DEBUG: async paging op in progress */
#define	PG_PTPAGE	0x8000		/* DEBUG: is a user page table page */

#if	VM_PAGE_DEBUG
#define	VM_PAGE_CHECK(mem) { \
	if ((((unsigned int) mem) < ((unsigned int) &vm_page_array[0])) || \
	    (((unsigned int) mem) > \
		((unsigned int) &vm_page_array[last_page-first_page])) || \
	    ((mem->flags & (PG_ACTIVE | PG_INACTIVE)) == \
		(PG_ACTIVE | PG_INACTIVE))) \
		panic("vm_page_check: not valid!"); \
}
#else /* VM_PAGE_DEBUG */
#define	VM_PAGE_CHECK(mem)
#endif /* VM_PAGE_DEBUG */

#ifdef KERNEL
/*
 *	Each pageable resident page falls into one of three lists:
 *
 *	free	
 *		Available for allocation now.
 *	inactive
 *		Not referenced in any map, but still has an
 *		object/offset-page mapping, and may be dirty.
 *		This is the list of pages that should be
 *		paged out next.
 *	active
 *		A list of pages which have been placed in
 *		at least one physical map.  This list is
 *		ordered, in LRU-like fashion.
 */

extern
struct pglist	vm_page_queue_free;	/* memory free queue */
extern
struct pglist	vm_page_queue_active;	/* active memory queue */
extern
struct pglist	vm_page_queue_inactive;	/* inactive memory queue */

extern
vm_page_t	vm_page_array;		/* First resident page in table */
extern
long		first_page;		/* first physical page number */
					/* ... represented in vm_page_array */
extern
long		last_page;		/* last physical page number */
					/* ... represented in vm_page_array */
					/* [INCLUSIVE] */
extern
vm_offset_t	first_phys_addr;	/* physical address for first_page */
extern
vm_offset_t	last_phys_addr;		/* physical address for last_page */

#define VM_PAGE_TO_PHYS(entry)	((entry)->phys_addr)

#define IS_VM_PHYSADDR(pa) \
		((pa) >= first_phys_addr && (pa) <= last_phys_addr)

#define PHYS_TO_VM_PAGE(pa) \
		(&vm_page_array[atop(pa) - first_page ])

extern
simple_lock_data_t	vm_page_queue_lock;	/* lock on active and inactive
						   page queues */
extern						/* lock on free page queue */
simple_lock_data_t	vm_page_queue_free_lock;

/*
 *	Functions implemented as macros
 */

#define PAGE_ASSERT_WAIT(m, interruptible)	{ \
				(m)->flags |= PG_WANTED; \
				assert_wait((int) (m), (interruptible)); \
			}

#define PAGE_WAKEUP(m)	{ \
				(m)->flags &= ~PG_BUSY; \
				if ((m)->flags & PG_WANTED) { \
					(m)->flags &= ~PG_WANTED; \
					thread_wakeup((int) (m)); \
				} \
			}

#define	vm_page_lock_queues()	simple_lock(&vm_page_queue_lock)
#define	vm_page_unlock_queues()	simple_unlock(&vm_page_queue_lock)

#define vm_page_set_modified(m)	{ (m)->flags &= ~PG_CLEAN; }

#define	VM_PAGE_INIT(mem, object, offset) { \
	(mem)->flags = PG_BUSY | PG_CLEAN | PG_FAKE; \
	vm_page_insert((mem), (object), (offset)); \
	(mem)->wire_count = 0; \
}

void		 vm_page_activate __P((vm_page_t));
vm_page_t	 vm_page_alloc __P((vm_object_t, vm_offset_t));
void		 vm_page_copy __P((vm_page_t, vm_page_t));
void		 vm_page_deactivate __P((vm_page_t));
void		 vm_page_free __P((vm_page_t));
void		 vm_page_insert __P((vm_page_t, vm_object_t, vm_offset_t));
vm_page_t	 vm_page_lookup __P((vm_object_t, vm_offset_t));
void		 vm_page_remove __P((vm_page_t));
void		 vm_page_rename __P((vm_page_t, vm_object_t, vm_offset_t));
void		 vm_page_startup __P((vm_offset_t *, vm_offset_t *));
void		 vm_page_unwire __P((vm_page_t));
void		 vm_page_wire __P((vm_page_t));
boolean_t	 vm_page_zero_fill __P((vm_page_t));

#endif /* KERNEL */
#endif /* !_VM_PAGE_ */
OpenPOWER on IntegriCloud