332 lines
10 KiB
C
332 lines
10 KiB
C
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_page.h 8.2 (Berkeley) 12/13/93
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $Id: vm_page.h,v 1.25 1996/01/30 23:02:38 mpp Exp $
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*/
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/*
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* Resident memory system definitions.
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*/
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#ifndef _VM_PAGE_
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#define _VM_PAGE_
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#include <vm/pmap.h>
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/*
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* Management of resident (logical) pages.
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*
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* A small structure is kept for each resident
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* page, indexed by page number. Each structure
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* is an element of several lists:
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*
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* A hash table bucket used to quickly
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* perform object/offset lookups
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*
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* A list of all pages for a given object,
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* so they can be quickly deactivated at
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* time of deallocation.
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*
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* An ordered list of pages due for pageout.
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*
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* In addition, the structure contains the object
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* and offset to which this page belongs (for pageout),
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* and sundry status bits.
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*
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* Fields in this structure are locked either by the lock on the
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* object that the page belongs to (O) or by the lock on the page
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* queues (P).
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*/
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TAILQ_HEAD(pglist, vm_page);
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struct vm_page {
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TAILQ_ENTRY(vm_page) pageq; /* queue info for FIFO queue or free list (P) */
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TAILQ_ENTRY(vm_page) hashq; /* hash table links (O) */
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TAILQ_ENTRY(vm_page) listq; /* pages in same object (O) */
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vm_object_t object; /* which object am I in (O,P) */
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vm_pindex_t pindex; /* offset into object (O,P) */
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vm_offset_t phys_addr; /* physical address of page */
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u_short queue:4, /* page queue index */
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flags:12; /* see below */
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u_short wire_count; /* wired down maps refs (P) */
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short hold_count; /* page hold count */
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u_char act_count; /* page usage count */
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u_char busy; /* page busy count */
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/* NOTE that these must support one bit per DEV_BSIZE in a page!!! */
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/* so, on normal X86 kernels, they must be at least 8 bits wide */
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u_char valid; /* map of valid DEV_BSIZE chunks */
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u_char dirty; /* map of dirty DEV_BSIZE chunks */
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};
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#define PQ_NONE 0
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#define PQ_FREE 1
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#define PQ_ZERO 2
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#define PQ_INACTIVE 3
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#define PQ_ACTIVE 4
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#define PQ_CACHE 5
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/*
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* These are the flags defined for vm_page.
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*
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* Note: PG_FILLED and PG_DIRTY are added for the filesystems.
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*/
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#define PG_BUSY 0x01 /* page is in transit (O) */
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#define PG_WANTED 0x02 /* someone is waiting for page (O) */
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#define PG_TABLED 0x04 /* page is in VP table (O) */
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#define PG_FICTITIOUS 0x08 /* physical page doesn't exist (O) */
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#define PG_WRITEABLE 0x10 /* page is mapped writeable */
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#define PG_MAPPED 0x20 /* page is mapped */
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#define PG_ZERO 0x40 /* page is zeroed */
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#define PG_REFERENCED 0x80 /* page has been referenced */
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#define PG_CLEANCHK 0x100 /* page has been checked for cleaning */
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/*
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* Misc constants.
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*/
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#define ACT_DECLINE 1
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#define ACT_ADVANCE 3
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#define ACT_MAX 100
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#define PFCLUSTER_BEHIND 3
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#define PFCLUSTER_AHEAD 3
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#ifdef KERNEL
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/*
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* Each pageable resident page falls into one of four lists:
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*
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* free
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* Available for allocation now.
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*
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* The following are all LRU sorted:
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*
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* cache
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* Almost available for allocation. Still in an
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* object, but clean and immediately freeable at
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* non-interrupt times.
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*
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* inactive
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* Low activity, candidates for reclamation.
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* This is the list of pages that should be
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* paged out next.
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*
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* active
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* Pages that are "active" i.e. they have been
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* recently referenced.
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*
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* zero
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* Pages that are really free and have been pre-zeroed
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*
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*/
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extern struct pglist vm_page_queue_free; /* memory free queue */
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extern struct pglist vm_page_queue_zero; /* zeroed memory free queue */
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extern struct pglist vm_page_queue_active; /* active memory queue */
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extern struct pglist vm_page_queue_inactive; /* inactive memory queue */
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extern struct pglist vm_page_queue_cache; /* cache memory queue */
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extern int vm_page_zero_count;
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extern vm_page_t vm_page_array; /* First resident page in table */
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extern long first_page; /* first physical page number */
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/* ... represented in vm_page_array */
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extern long last_page; /* last physical page number */
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/* ... represented in vm_page_array */
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/* [INCLUSIVE] */
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extern vm_offset_t first_phys_addr; /* physical address for first_page */
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extern vm_offset_t last_phys_addr; /* physical address for last_page */
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#define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr)
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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 ])
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/*
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* Functions implemented as macros
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*/
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#define PAGE_ASSERT_WAIT(m, interruptible) { \
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(m)->flags |= PG_WANTED; \
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assert_wait((int) (m), (interruptible)); \
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}
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#define PAGE_WAKEUP(m) { \
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(m)->flags &= ~PG_BUSY; \
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if ((m)->flags & PG_WANTED) { \
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(m)->flags &= ~PG_WANTED; \
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wakeup((caddr_t) (m)); \
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} \
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}
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#if PAGE_SIZE == 4096
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#define VM_PAGE_BITS_ALL 0xff
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#endif
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#if PAGE_SIZE == 8192
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#define VM_PAGE_BITS_ALL 0xffff
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#endif
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#define VM_ALLOC_NORMAL 0
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#define VM_ALLOC_INTERRUPT 1
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#define VM_ALLOC_SYSTEM 2
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#define VM_ALLOC_ZERO 3
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void vm_page_activate __P((vm_page_t));
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vm_page_t vm_page_alloc __P((vm_object_t, vm_pindex_t, int));
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void vm_page_cache __P((register vm_page_t));
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static __inline void vm_page_copy __P((vm_page_t, vm_page_t));
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void vm_page_deactivate __P((vm_page_t));
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void vm_page_free __P((vm_page_t));
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void vm_page_insert __P((vm_page_t, vm_object_t, vm_pindex_t));
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vm_page_t vm_page_lookup __P((vm_object_t, vm_pindex_t));
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void vm_page_remove __P((vm_page_t));
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void vm_page_rename __P((vm_page_t, vm_object_t, vm_pindex_t));
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vm_offset_t vm_page_startup __P((vm_offset_t, vm_offset_t, vm_offset_t));
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void vm_page_unwire __P((vm_page_t));
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void vm_page_wire __P((vm_page_t));
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void vm_page_unqueue __P((vm_page_t));
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void vm_page_set_validclean __P((vm_page_t, int, int));
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void vm_page_set_invalid __P((vm_page_t, int, int));
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static __inline boolean_t vm_page_zero_fill __P((vm_page_t));
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int vm_page_is_valid __P((vm_page_t, int, int));
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void vm_page_test_dirty __P((vm_page_t));
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int vm_page_bits __P((int, int));
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/*
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* Keep page from being freed by the page daemon
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* much of the same effect as wiring, except much lower
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* overhead and should be used only for *very* temporary
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* holding ("wiring").
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*/
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static __inline void
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vm_page_hold(vm_page_t mem)
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{
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mem->hold_count++;
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}
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#ifdef DIAGNOSTIC
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#include <sys/systm.h> /* make GCC shut up */
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#endif
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static __inline void
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vm_page_unhold(vm_page_t mem)
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{
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#ifdef DIAGNOSTIC
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if (--mem->hold_count < 0)
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panic("vm_page_unhold: hold count < 0!!!");
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#else
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--mem->hold_count;
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#endif
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}
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static __inline void
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vm_page_protect(vm_page_t mem, int prot)
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{
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if (prot == VM_PROT_NONE) {
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if (mem->flags & (PG_WRITEABLE|PG_MAPPED)) {
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pmap_page_protect(VM_PAGE_TO_PHYS(mem), prot);
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mem->flags &= ~(PG_WRITEABLE|PG_MAPPED);
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}
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} else if ((prot == VM_PROT_READ) && (mem->flags & PG_WRITEABLE)) {
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pmap_page_protect(VM_PAGE_TO_PHYS(mem), prot);
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mem->flags &= ~PG_WRITEABLE;
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}
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}
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/*
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* vm_page_zero_fill:
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*
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* Zero-fill the specified page.
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* Written as a standard pagein routine, to
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* be used by the zero-fill object.
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*/
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static __inline boolean_t
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vm_page_zero_fill(m)
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vm_page_t m;
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{
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pmap_zero_page(VM_PAGE_TO_PHYS(m));
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return (TRUE);
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}
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/*
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* vm_page_copy:
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*
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* Copy one page to another
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*/
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static __inline void
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vm_page_copy(src_m, dest_m)
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vm_page_t src_m;
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vm_page_t dest_m;
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{
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pmap_copy_page(VM_PAGE_TO_PHYS(src_m), VM_PAGE_TO_PHYS(dest_m));
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dest_m->valid = VM_PAGE_BITS_ALL;
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}
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#endif /* KERNEL */
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#endif /* !_VM_PAGE_ */
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