8e58bf6875
the moment, but will be in the future. Other changes mostly cosmetic, but are made for future VMIO considerations. Submitted by: John Dyson
274 lines
9.2 KiB
C
274 lines
9.2 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 1.6 1994/09/27 18:00:29 davidg 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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/*
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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
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* 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_offset_t offset; /* offset into object (O,P) */
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u_short wire_count; /* wired down maps refs (P) */
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u_short flags; /* see below */
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short hold_count; /* page hold count */
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u_short act_count; /* page usage count */
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u_short busy; /* page busy count */
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vm_offset_t phys_addr; /* physical address of page */
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};
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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_INACTIVE 0x0001 /* page is in inactive list (P) */
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#define PG_ACTIVE 0x0002 /* page is in active list (P) */
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#define PG_LAUNDRY 0x0004 /* page is being cleaned now (P)*/
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#define PG_CLEAN 0x0008 /* page has not been modified */
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#define PG_BUSY 0x0010 /* page is in transit (O) */
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#define PG_WANTED 0x0020 /* someone is waiting for page (O) */
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#define PG_TABLED 0x0040 /* page is in VP table (O) */
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#define PG_COPYONWRITE 0x0080 /* must copy page before changing (O) */
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#define PG_FICTITIOUS 0x0100 /* physical page doesn't exist (O) */
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#define PG_FAKE 0x0200 /* page is placeholder for pagein (O) */
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#define PG_FILLED 0x0400 /* client flag to set when filled */
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#define PG_DIRTY 0x0800 /* client flag to set when dirty */
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#define PG_REFERENCED 0x1000 /* page has been referenced */
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#define PG_VMIO 0x2000 /* VMIO flag */
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#define PG_PAGEROWNED 0x4000 /* DEBUG: async paging op in progress */
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#define PG_FREE 0x8000 /* page is in free list */
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#if VM_PAGE_DEBUG
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#define VM_PAGE_CHECK(mem) { \
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if ((((unsigned int) mem) < ((unsigned int) &vm_page_array[0])) || \
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(((unsigned int) mem) > \
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((unsigned int) &vm_page_array[last_page-first_page])) || \
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((mem->flags & (PG_ACTIVE | PG_INACTIVE)) == \
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(PG_ACTIVE | PG_INACTIVE))) \
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panic("vm_page_check: not valid!"); \
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}
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#else /* VM_PAGE_DEBUG */
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#define VM_PAGE_CHECK(mem)
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#endif /* VM_PAGE_DEBUG */
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#ifdef KERNEL
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/*
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* Each pageable resident page falls into one of three lists:
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*
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* free
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* Available for allocation now.
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* inactive
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* Not referenced in any map, but still has an
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* object/offset-page mapping, and may be dirty.
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* This is the list of pages that should be
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* paged out next.
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* active
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* A list of pages which have been placed in
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* at least one physical map. This list is
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* ordered, in LRU-like fashion.
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*/
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extern
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struct pglist vm_page_queue_free; /* memory free queue */
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extern
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struct pglist vm_page_queue_active; /* active memory queue */
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extern
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struct pglist vm_page_queue_inactive; /* inactive memory queue */
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extern
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vm_page_t vm_page_array; /* First resident page in table */
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extern
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long first_page; /* first physical page number */
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/* ... represented in vm_page_array */
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extern
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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
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vm_offset_t first_phys_addr; /* physical address for first_page */
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extern
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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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extern
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simple_lock_data_t vm_page_queue_lock; /* lock on active and inactive
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page queues */
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extern /* lock on free page queue */
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simple_lock_data_t vm_page_queue_free_lock;
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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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#define vm_page_lock_queues() simple_lock(&vm_page_queue_lock)
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#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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#define VM_PAGE_INIT(mem, object, offset) { \
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(mem)->flags = PG_BUSY | PG_CLEAN | PG_FAKE; \
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vm_page_insert((mem), (object), (offset)); \
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(mem)->wire_count = 0; \
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(mem)->hold_count = 0; \
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(mem)->act_count = 0; \
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}
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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_offset_t));
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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_offset_t));
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vm_page_t vm_page_lookup __P((vm_object_t, vm_offset_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_offset_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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boolean_t vm_page_zero_fill __P((vm_page_t));
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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(mem)
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vm_page_t mem;
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{
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mem->hold_count++;
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}
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static inline void
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vm_page_unhold(mem)
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vm_page_t mem;
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{
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if( --mem->hold_count < 0)
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panic("vm_page_unhold: hold count < 0!!!");
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}
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#endif /* KERNEL */
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#endif /* !_VM_PAGE_ */
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