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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.
- *
- * from: @(#)vm_page.h 7.3 (Berkeley) 4/21/91
- * $Id: vm_page.h,v 1.6 1993/11/10 08:22:18 cgd Exp $
- *
- *
- * 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_
-
- /*
- * 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) */
-
- unsigned int wire_count:16, /* how many wired down maps use me?
- (P) */
- /* boolean_t */ inactive:1, /* page is in inactive list (P) */
- active:1, /* page is in active list (P) */
- laundry:1, /* page is being cleaned now (P)*/
- #ifdef DEBUG
- pagerowned:1, /* async paging op in progress */
- ptpage:1, /* is a user page table page */
- #endif
- :0; /* (force to 'long' boundary) */
- #ifdef ns32000
- int pad; /* extra space for ns32000 bit ops */
- #endif /* ns32000 */
- boolean_t clean; /* page has not been modified */
- unsigned int
- /* boolean_t */ busy:1, /* page is in transit (O) */
- wanted:1, /* someone is waiting for page (O) */
- tabled:1, /* page is in VP table (O) */
- copy_on_write:1,/* page must be copied before being
- changed (O) */
- fictitious:1, /* physical page doesn't exist (O) */
- fake:1, /* page is a placeholder for page-in
- (O) */
- :0;
-
- vm_offset_t phys_addr; /* physical address of page */
- vm_prot_t page_lock; /* Uses prohibited by data manager */
- vm_prot_t unlock_request; /* Outstanding unlock request */
- };
-
- typedef struct vm_page *vm_page_t;
-
- #if VM_PAGE_DEBUG
- #ifdef MACHINE_NONCONTIG
- #define VM_PAGE_CHECK(mem) { \
- if ( (((unsigned int) mem) < ((unsigned int) &vm_page_array[0])) || \
- (((unsigned int) mem) > ((unsigned int) &vm_page_array[vm_page_count])) || \
- (mem->active && mem->inactive) \
- ) panic("vm_page_check: not valid!"); \
- }
- #else /* MACHINE_NONCONTIG */
- #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->active && mem->inactive) \
- ) panic("vm_page_check: not valid!"); \
- }
- #endif /* MACHINE_NONCONTIG */
- #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
- 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
- extern
- long first_page; /* first physical page number */
- /* ... represented in vm_page_array */
- extern
- long last_page; /* last physical page number */
-
- 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 */
-
- 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
- #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 ])
- #else
- #define IS_VM_PHYSADDR(pa) \
- (pmap_page_index(pa) >= 0)
- #define PHYS_TO_VM_PAGE(pa) \
- (&vm_page_array[pmap_page_index(pa) - first_page])
- #endif /* MACHINE_NONCONTIG */
-
- 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_init();
- void vm_page_free();
- void vm_page_activate();
- void vm_page_deactivate();
- void vm_page_rename();
- void vm_page_replace();
-
- 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
- */
-
- #define PAGE_ASSERT_WAIT(m, interruptible) { \
- (m)->wanted = TRUE; \
- assert_wait((int) (m), (interruptible)); \
- }
-
- #define PAGE_WAKEUP(m) { \
- (m)->busy = FALSE; \
- if ((m)->wanted) { \
- (m)->wanted = FALSE; \
- 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)->clean = FALSE; }
- #endif /* KERNEL */
-
- #endif /* !_VM_VM_PAGE_H_ */
-