NetBSD/sys/vm/vm_page.h

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/*
* Copyright (c) 1991 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.
*
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* from: @(#)vm_page.h 7.3 (Berkeley) 4/21/91
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* $Id: vm_page.h,v 1.7 1993/12/20 12:40:20 cgd Exp $
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*
*
* 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.
*/
#ifndef _VM_VM_PAGE_H_
#define _VM_VM_PAGE_H_
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/*
* Resident memory system definitions.
*/
/*
* 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).
*/
struct vm_page {
queue_chain_t pageq; /* queue info for FIFO
* queue or free list (P) */
queue_chain_t hashq; /* hash table links (O)*/
queue_chain_t listq; /* all pages in same object (O)*/
vm_object_t object; /* which object am I in (O,P)*/
vm_offset_t offset; /* offset into that object (O,P) */
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u_short wire_count; /* number wired down maps use me? (P) */
u_short flags; /* flags; see below */
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vm_offset_t phys_addr; /* physical address of page */
};
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/*
* These are the flags defined for vm_page.
*/
#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_COW 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_PAGEROWNED 0x4000 /* DEBUG: async paging op in progress */
#define PG_PTPAGE 0x8000 /* DEBUG: is a user page table page */
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#if VM_PAGE_DEBUG
#ifdef MACHINE_NONCONTIG
#define VM_PAGE_CHECK(mem) { \
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if ( (((unsigned int) mem) < ((unsigned int) &vm_page_array[0])) || \
(((unsigned int) mem) > \
((unsigned int) &vm_page_array[vm_page_count])) || \
((mem->flags & (PG_ACTIVE | PG_INACTIVE)) == \
(PG_ACTIVE | PG_INACTIVE))) \
panic("vm_page_check: not valid!"); \
}
#else /* MACHINE_NONCONTIG */
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#define VM_PAGE_CHECK(mem) { \
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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!"); \
}
#endif /* MACHINE_NONCONTIG */
#else /* VM_PAGE_DEBUG */
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#define VM_PAGE_CHECK(mem)
#endif /* VM_PAGE_DEBUG */
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#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
queue_head_t vm_page_queue_free; /* memory free queue */
extern
queue_head_t vm_page_queue_active; /* active memory queue */
extern
queue_head_t vm_page_queue_inactive; /* inactive memory queue */
extern
vm_page_t vm_page_array; /* First resident page in table */
#ifndef MACHINE_NONCONTIG
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extern
long first_page; /* first physical page number */
/* ... represented in vm_page_array */
extern
long last_page; /* last physical page number */
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extern
vm_offset_t first_phys_addr; /* physical address for first_page */
extern
vm_offset_t last_phys_addr; /* physical address for last_page */
#else /* MACHINE_NONCONTIG */
extern
u_long first_page; /* first physical page number */
extern
int vm_page_count; /* How many pages do we manage? */
#endif /* MACHINE_NONCONTIG */
/* ... represented in vm_page_array */
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extern
int vm_page_free_count; /* How many pages are free? */
extern
int vm_page_active_count; /* How many pages are active? */
extern
int vm_page_inactive_count; /* How many pages are inactive? */
extern
int vm_page_wire_count; /* How many pages are wired? */
extern
int vm_page_free_target; /* How many do we want free? */
extern
int vm_page_free_min; /* When to wakeup pageout */
extern
int vm_page_inactive_target;/* How many do we want inactive? */
extern
int vm_page_free_reserved; /* How many pages reserved to do pageout */
extern
int vm_page_laundry_count; /* How many pages being laundered? */
#define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr)
#ifndef MACHINE_NONCONTIG
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#define IS_VM_PHYSADDR(pa) \
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((pa) >= first_phys_addr && (pa) <= last_phys_addr)
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#define PHYS_TO_VM_PAGE(pa) \
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(&vm_page_array[atop(pa) - first_page ])
#else
#define IS_VM_PHYSADDR(pa) \
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(pmap_page_index(pa) >= 0)
#define PHYS_TO_VM_PAGE(pa) \
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(&vm_page_array[pmap_page_index(pa) - first_page])
#endif /* MACHINE_NONCONTIG */
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extern
simple_lock_data_t vm_page_queue_lock; /* lock on active and inactive
page queues */
extern
simple_lock_data_t vm_page_queue_free_lock;
/* lock on free page queue */
vm_offset_t vm_page_startup();
vm_page_t vm_page_lookup();
vm_page_t vm_page_alloc();
void vm_page_free();
void vm_page_activate();
void vm_page_deactivate();
void vm_page_rename();
void vm_page_replace();
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void vm_page_insert();
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boolean_t vm_page_zero_fill();
void vm_page_copy();
void vm_page_wire();
void vm_page_unwire();
void vm_set_page_size();
/*
* Functions implemented as macros
*/
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#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)); \
} \
}
#ifdef MACHINE_NONCONTIG
#define VM_PAGE_INIT(mem, obj, offset) { \
(mem)->flags = PG_BUSY | PG_CLEAN | PG_FAKE; \
if (obj) \
vm_page_insert((mem), (obj), (offset)); \
else \
(mem)->object = NULL; \
(mem)->wire_count = 0; \
}
#else /* MACHINE_NONCONTIG */
#define VM_PAGE_INIT(mem, obj, offset) { \
(mem)->flags = PG_BUSY | PG_CLEAN | PG_FAKE; \
vm_page_insert((mem), (obj), (offset)); \
(mem)->wire_count = 0; \
}
#endif /* MACHINE_NONCONTIG */
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#define VM_PAGE_LOCK_QUEUES() simple_lock(&vm_page_queue_lock)
#define VM_PAGE_UNLOCK_QUEUES() simple_unlock(&vm_page_queue_lock)
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#define VM_PAGE_SET_MODIFIED(m) { (m)->flags &= ~PG_CLEAN; }
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#endif /* KERNEL */
#endif /* !_VM_VM_PAGE_H_ */