1/*	$OpenBSD: uvm_page.h,v 1.71 2024/05/13 01:15:53 jsg Exp $	*/
2/*	$NetBSD: uvm_page.h,v 1.19 2000/12/28 08:24:55 chs Exp $	*/
3
4/*
5 * Copyright (c) 1997 Charles D. Cranor and Washington University.
6 * Copyright (c) 1991, 1993, The Regents of the University of California.
7 *
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * The Mach Operating System project at Carnegie-Mellon University.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *	@(#)vm_page.h   7.3 (Berkeley) 4/21/91
38 * from: Id: uvm_page.h,v 1.1.2.6 1998/02/04 02:31:42 chuck Exp
39 *
40 *
41 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
42 * All rights reserved.
43 *
44 * Permission to use, copy, modify and distribute this software and
45 * its documentation is hereby granted, provided that both the copyright
46 * notice and this permission notice appear in all copies of the
47 * software, derivative works or modified versions, and any portions
48 * thereof, and that both notices appear in supporting documentation.
49 *
50 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
51 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
52 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
53 *
54 * Carnegie Mellon requests users of this software to return to
55 *
56 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
57 *  School of Computer Science
58 *  Carnegie Mellon University
59 *  Pittsburgh PA 15213-3890
60 *
61 * any improvements or extensions that they make and grant Carnegie the
62 * rights to redistribute these changes.
63 */
64
65#ifndef _UVM_UVM_PAGE_H_
66#define _UVM_UVM_PAGE_H_
67
68/*
69 * uvm_page.h
70 */
71
72/*
73 *	Resident memory system definitions.
74 */
75
76/*
77 *	Management of resident (logical) pages.
78 *
79 *	A small structure is kept for each resident
80 *	page, indexed by page number.  Each structure
81 *	contains a list used for manipulating pages, and
82 *	a tree structure for in object/offset lookups
83 *
84 *	In addition, the structure contains the object
85 *	and offset to which this page belongs (for pageout),
86 *	and sundry status bits.
87 *
88 *	Fields in this structure are possibly locked by the lock on the page
89 *	queues (P).
90 */
91
92TAILQ_HEAD(pglist, vm_page);
93
94struct vm_page {
95	TAILQ_ENTRY(vm_page)	pageq;		/* queue info for FIFO
96						 * queue or free list (P) */
97	RBT_ENTRY(vm_page)	objt;		/* object tree */
98
99	struct vm_anon		*uanon;		/* anon (P) */
100	struct uvm_object	*uobject;	/* object (P) */
101	voff_t			offset;		/* offset into object (P) */
102
103	u_int			pg_flags;	/* object flags [P] */
104
105	u_int			pg_version;	/* version count */
106	u_int			wire_count;	/* wired down map refs [P] */
107
108	paddr_t			phys_addr;	/* physical address of page */
109	psize_t			fpgsz;		/* free page range size */
110
111	struct vm_page_md	mdpage;		/* pmap-specific data */
112
113#if defined(UVM_PAGE_TRKOWN)
114	/* debugging fields to track page ownership */
115	pid_t			owner;		/* thread that set PG_BUSY */
116	char			*owner_tag;	/* why it was set busy */
117#endif
118};
119
120/*
121 * These are the flags defined for vm_page.
122 *
123 * Note: PG_FILLED and PG_DIRTY are added for the filesystems.
124 */
125
126/*
127 * locking rules:
128 *   PQ_ ==> lock by page queue lock
129 *   PQ_FREE is locked by free queue lock and is mutex with all other PQs
130 *   pg_flags may only be changed using the atomic operations.
131 *
132 * PG_ZERO is used to indicate that a page has been pre-zero'd.  This flag
133 * is only set when the page is on no queues, and is cleared when the page
134 * is placed on the free list.
135 */
136
137#define	PG_BUSY		0x00000001	/* page is locked */
138#define	PG_WANTED	0x00000002	/* someone is waiting for page */
139#define	PG_TABLED	0x00000004	/* page is in VP table  */
140#define	PG_CLEAN	0x00000008	/* page has not been modified */
141#define PG_CLEANCHK	0x00000010	/* clean bit has been checked */
142#define PG_RELEASED	0x00000020	/* page released while paging */
143#define	PG_FAKE		0x00000040	/* page is not yet initialized */
144#define PG_RDONLY	0x00000080	/* page must be mapped read-only */
145#define PG_ZERO		0x00000100	/* page is pre-zero'd */
146#define PG_DEV		0x00000200	/* page is in device space, lay off */
147
148#define PG_PAGER1	0x00001000	/* pager-specific flag */
149#define PG_MASK		0x0000ffff
150
151#define PQ_FREE		0x00010000	/* page is on free list */
152#define PQ_INACTIVE	0x00020000	/* page is in inactive list */
153#define PQ_ACTIVE	0x00040000	/* page is in active list */
154#define PQ_ANON		0x00100000	/* page is part of an anon, rather
155					   than an uvm_object */
156#define PQ_AOBJ		0x00200000	/* page is part of an anonymous
157					   uvm_object */
158#define PQ_SWAPBACKED	(PQ_ANON|PQ_AOBJ)
159#define	PQ_ENCRYPT	0x00400000	/* page needs {en,de}cryption */
160#define PQ_MASK		0x00ff0000
161
162#define PG_PMAP0	0x01000000	/* Used by some pmaps. */
163#define PG_PMAP1	0x02000000	/* Used by some pmaps. */
164#define PG_PMAP2	0x04000000	/* Used by some pmaps. */
165#define PG_PMAP3	0x08000000	/* Used by some pmaps. */
166#define PG_PMAP4	0x10000000	/* Used by some pmaps. */
167#define PG_PMAP5	0x20000000	/* Used by some pmaps. */
168#define PG_PMAPMASK	0x3f000000
169
170/*
171 * physical memory layout structure
172 *
173 * MD vmparam.h must #define:
174 *   VM_PHYSSEG_MAX = max number of physical memory segments we support
175 *		   (if this is "1" then we revert to a "contig" case)
176 *   VM_PHYSSEG_STRAT: memory sort/search options (for VM_PHYSSEG_MAX > 1)
177 * 	- VM_PSTRAT_RANDOM:   linear search (random order)
178 *	- VM_PSTRAT_BSEARCH:  binary search (sorted by address)
179 *	- VM_PSTRAT_BIGFIRST: linear search (sorted by largest segment first)
180 *      - others?
181 *   XXXCDC: eventually we should purge all left-over global variables...
182 */
183#define VM_PSTRAT_RANDOM	1
184#define VM_PSTRAT_BSEARCH	2
185#define VM_PSTRAT_BIGFIRST	3
186
187/*
188 * vm_physmemseg: describes one segment of physical memory
189 */
190struct vm_physseg {
191	paddr_t	start;			/* PF# of first page in segment */
192	paddr_t	end;			/* (PF# of last page in segment) + 1 */
193	paddr_t	avail_start;		/* PF# of first free page in segment */
194	paddr_t	avail_end;		/* (PF# of last free page in segment) +1  */
195	struct	vm_page *pgs;		/* vm_page structures (from start) */
196	struct	vm_page *lastpg;	/* vm_page structure for end */
197};
198
199#ifdef _KERNEL
200
201/*
202 * physical memory config is stored in vm_physmem.
203 */
204
205extern struct vm_physseg vm_physmem[VM_PHYSSEG_MAX];
206extern int vm_nphysseg;
207
208/*
209 * prototypes: the following prototypes define the interface to pages
210 */
211
212void		uvm_page_init(vaddr_t *, vaddr_t *);
213#if defined(UVM_PAGE_TRKOWN)
214void		uvm_page_own(struct vm_page *, char *);
215#endif
216#if !defined(PMAP_STEAL_MEMORY)
217boolean_t	uvm_page_physget(paddr_t *);
218#endif
219
220void		uvm_pageactivate(struct vm_page *);
221void		uvm_pagedequeue(struct vm_page *);
222vaddr_t		uvm_pageboot_alloc(vsize_t);
223void		uvm_pagecopy(struct vm_page *, struct vm_page *);
224void		uvm_pagedeactivate(struct vm_page *);
225void		uvm_pageclean(struct vm_page *);
226void		uvm_pagefree(struct vm_page *);
227void		uvm_page_unbusy(struct vm_page **, int);
228struct vm_page	*uvm_pagelookup(struct uvm_object *, voff_t);
229void		uvm_pageunwire(struct vm_page *);
230void		uvm_pagewait(struct vm_page *, struct rwlock *, const char *);
231void		uvm_pagewire(struct vm_page *);
232void		uvm_pagezero(struct vm_page *);
233void		uvm_pagealloc_pg(struct vm_page *, struct uvm_object *,
234		    voff_t, struct vm_anon *);
235
236struct uvm_constraint_range; /* XXX move to uvm_extern.h? */
237psize_t		uvm_pagecount(struct uvm_constraint_range*);
238
239#if  VM_PHYSSEG_MAX == 1
240/*
241 * Inline functions for archs where function calls are expensive.
242 */
243/*
244 * vm_physseg_find: find vm_physseg structure that belongs to a PA
245 */
246static inline int
247vm_physseg_find(paddr_t pframe, int *offp)
248{
249	/* 'contig' case */
250	if (pframe >= vm_physmem[0].start && pframe < vm_physmem[0].end) {
251		if (offp)
252			*offp = pframe - vm_physmem[0].start;
253		return 0;
254	}
255	return -1;
256}
257
258/*
259 * PHYS_TO_VM_PAGE: find vm_page for a PA.   used by MI code to get vm_pages
260 * back from an I/O mapping (ugh!).   used in some MD code as well.
261 */
262static inline struct vm_page *
263PHYS_TO_VM_PAGE(paddr_t pa)
264{
265	paddr_t pf = atop(pa);
266	int	off;
267	int	psi;
268
269	psi = vm_physseg_find(pf, &off);
270
271	return ((psi == -1) ? NULL : &vm_physmem[psi].pgs[off]);
272}
273#else
274/* if VM_PHYSSEG_MAX > 1 they're not inline, they're in uvm_page.c. */
275struct vm_page	*PHYS_TO_VM_PAGE(paddr_t);
276int		vm_physseg_find(paddr_t, int *);
277#endif
278
279/*
280 * macros
281 */
282
283#define uvm_lock_pageq()	mtx_enter(&uvm.pageqlock)
284#define uvm_unlock_pageq()	mtx_leave(&uvm.pageqlock)
285#define uvm_lock_fpageq()	mtx_enter(&uvm.fpageqlock)
286#define uvm_unlock_fpageq()	mtx_leave(&uvm.fpageqlock)
287
288#define	UVM_PAGEZERO_TARGET	(uvmexp.free / 8)
289
290#define VM_PAGE_TO_PHYS(entry)	((entry)->phys_addr)
291
292#define VM_PAGE_IS_FREE(entry)  ((entry)->pg_flags & PQ_FREE)
293
294#define	PADDR_IS_DMA_REACHABLE(paddr)	\
295	(dma_constraint.ucr_low <= paddr && dma_constraint.ucr_high > paddr)
296
297#endif /* _KERNEL */
298
299#endif /* _UVM_UVM_PAGE_H_ */
300