600 lines
18 KiB
C++
600 lines
18 KiB
C++
/* $NetBSD: vm_page.h,v 1.26 1998/03/12 06:25:53 thorpej Exp $ */
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/*
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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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* @(#)vm_page.h 8.3 (Berkeley) 1/9/95
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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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/*
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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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#if defined(_KERNEL) && !defined(_LKM)
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#include "opt_uvm.h"
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#endif
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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) [or both].
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*/
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#if defined(UVM)
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/*
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* locking note: the mach version of this data structure had bit
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* fields for the flags, and the bit fields were divided into two
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* items (depending on who locked what). some time, in BSD, the bit
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* fields were dumped and all the flags were lumped into one short.
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* that is fine for a single threaded uniprocessor OS, but bad if you
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* want to actual make use of locking (simple_lock's). so, we've
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* seperated things back out again.
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*
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* note the page structure has no lock of its own.
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*/
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#include <uvm/uvm_extern.h>
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#include <vm/pglist.h>
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#else
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TAILQ_HEAD(pglist, vm_page);
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#endif /* UVM */
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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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#if !defined(UVM) /* uvm uses obju */
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vm_object_t object; /* which object am I in (O,P)*/
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#endif
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vm_offset_t offset; /* offset into object (O,P) */
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#if defined(UVM)
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struct uvm_object *uobject; /* object (O,P) */
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struct vm_anon *uanon; /* anon (O,P) */
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u_short flags; /* object flags [O] */
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u_short version; /* version count [O] */
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u_short wire_count; /* wired down map refs [P] */
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u_short pqflags; /* page queue flags [P] */
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u_int loan_count; /* number of active loans
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* to read: [O or P]
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* to modify: [O _and_ P] */
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#else
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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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#endif
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vm_offset_t phys_addr; /* physical address of page */
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#if defined(UVM) && defined(UVM_PAGE_TRKOWN)
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/* debugging fields to track page ownership */
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pid_t owner; /* proc that set PG_BUSY */
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char *owner_tag; /* why it was set busy */
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#endif
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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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#if defined(UVM)
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/*
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* locking rules:
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* PG_ ==> locked by object lock
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* PQ_ ==> lock by page queue lock
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* PQ_FREE is locked by free queue lock and is mutex with all other PQs
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*
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* possible deadwood: PG_FAULTING, PQ_LAUNDRY
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*/
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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 */
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#define PG_WANTED 0x0020 /* someone is waiting for page */
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#define PG_TABLED 0x0040 /* page is in VP table */
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#define PG_FAKE 0x0200 /* page is placeholder for pagein */
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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_RELEASED 0x1000 /* page released while paging */
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#define PG_FAULTING 0x2000 /* page is being faulted in */
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#define PG_CLEANCHK 0x4000 /* clean bit has been checked */
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#define PQ_FREE 0x0001 /* page is on free list */
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#define PQ_INACTIVE 0x0002 /* page is in inactive list */
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#define PQ_ACTIVE 0x0004 /* page is in active list */
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#define PQ_LAUNDRY 0x0008 /* page is being cleaned now */
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#define PQ_ANON 0x0010 /* page is part of an anon, rather
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than an uvm_object */
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#define PQ_AOBJ 0x0020 /* page is part of an anonymous
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uvm_object */
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#define PQ_SWAPBACKED (PQ_ANON|PQ_AOBJ)
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#else
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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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There exists a case where this bit
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will be cleared, although the page
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is not physically dirty, which is
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when a collapse operation moves
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pages between two different pagers.
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The bit is then used as a marker
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for the pageout daemon to know it
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should be paged out into the target
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pager. */
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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_FREE 0x1000 /* XXX page is on free list */
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#define PG_FAULTING 0x2000 /* page is being faulted in */
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#define PG_PAGEROWNED 0x4000 /* DEBUG: async paging op in progress */
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#define PG_PTPAGE 0x8000 /* DEBUG: is a user page table page */
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#endif
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#if defined(MACHINE_NEW_NONCONTIG)
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/*
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* physical memory layout structure
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*
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* MD vmparam.h must #define:
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* VM_PHYSEG_MAX = max number of physical memory segments we support
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* (if this is "1" then we revert to a "contig" case)
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* VM_PHYSSEG_STRAT: memory sort/search options (for VM_PHYSEG_MAX > 1)
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* - VM_PSTRAT_RANDOM: linear search (random order)
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* - VM_PSTRAT_BSEARCH: binary search (sorted by address)
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* - VM_PSTRAT_BIGFIRST: linear search (sorted by largest segment first)
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* - others?
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* XXXCDC: eventually we should remove contig and old non-contig cases
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* and purge all left-over global variables...
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*/
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#define VM_PSTRAT_RANDOM 1
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#define VM_PSTRAT_BSEARCH 2
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#define VM_PSTRAT_BIGFIRST 3
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/*
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* vm_physmemseg: describes one segment of physical memory
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*/
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struct vm_physseg {
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vm_offset_t start; /* PF# of first page in segment */
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vm_offset_t end; /* (PF# of last page in segment) + 1 */
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vm_offset_t avail_start; /* PF# of first free page in segment */
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vm_offset_t avail_end; /* (PF# of last free page in segment) +1 */
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struct vm_page *pgs; /* vm_page structures (from start) */
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struct vm_page *lastpg; /* vm_page structure for end */
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struct pmap_physseg pmseg; /* pmap specific (MD) data */
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};
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#endif /* MACHINE_NEW_NONCONTIG */
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#if defined(_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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#if defined(MACHINE_NEW_NONCONTIG)
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/*
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* physical memory config is stored in vm_physmem.
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*/
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extern struct vm_physseg vm_physmem[VM_PHYSSEG_MAX];
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extern int vm_nphysseg;
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#else
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#if defined(MACHINE_NONCONTIG)
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/* OLD NONCONTIG CODE: NUKE NUKE NUKE ONCE CONVERTED */
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extern
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u_long first_page; /* first physical page number */
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extern
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int vm_page_count; /* How many pages do we manage? */
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extern
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vm_page_t vm_page_array; /* First resident page in table */
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#define VM_PAGE_INDEX(pa) \
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(pmap_page_index((pa)) - first_page)
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#else
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/* OLD CONTIG CODE: NUKE NUKE NUKE ONCE CONVERTED */
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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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extern
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vm_page_t vm_page_array; /* First resident page in table */
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#define VM_PAGE_INDEX(pa) \
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(atop((pa)) - first_page)
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#endif /* MACHINE_NONCONTIG */
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#endif /* MACHINE_NEW_NONCONTIG */
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/*
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* prototypes
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*/
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#if defined(MACHINE_NEW_NONCONTIG)
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static struct vm_page *PHYS_TO_VM_PAGE __P((vm_offset_t));
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static int vm_physseg_find __P((vm_offset_t, int *));
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#endif
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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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vm_page_t vm_page_alloc1 __P((void));
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int vm_page_alloc_memory __P((vm_size_t size, vm_offset_t low,
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vm_offset_t high, vm_offset_t alignment, vm_offset_t boundary,
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struct pglist *rlist, int nsegs, int waitok));
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void vm_page_free_memory __P((struct pglist *list));
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#if defined(MACHINE_NONCONTIG) || defined(MACHINE_NEW_NONCONTIG)
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void vm_page_bootstrap __P((vm_offset_t *, vm_offset_t *));
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#endif
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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_free1 __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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#if defined(MACHINE_NEW_NONCONTIG)
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void vm_page_physload __P((vm_offset_t, vm_offset_t,
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vm_offset_t, vm_offset_t));
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void vm_page_physrehash __P((void));
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#endif
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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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#if !defined(MACHINE_NONCONTIG) && !defined(MACHINE_NEW_NONCONTIG)
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void vm_page_startup __P((vm_offset_t *, vm_offset_t *));
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#endif
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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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* macros and inlines
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*/
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#define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr)
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#if defined(MACHINE_NEW_NONCONTIG)
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/*
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* when VM_PHYSSEG_MAX is 1, we can simplify these functions
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*/
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/*
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* vm_physseg_find: find vm_physseg structure that belongs to a PA
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*/
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static __inline int
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vm_physseg_find(pframe, offp)
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vm_offset_t pframe;
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int *offp;
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{
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#if VM_PHYSSEG_MAX == 1
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/* 'contig' case */
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if (pframe >= vm_physmem[0].start && pframe < vm_physmem[0].end) {
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if (offp)
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*offp = pframe - vm_physmem[0].start;
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return(0);
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}
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return(-1);
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#elif (VM_PHYSSEG_STRAT == VM_PSTRAT_BSEARCH)
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/* binary search for it */
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int start, len, try;
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/*
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* if try is too large (thus target is less than than try) we reduce
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* the length to trunc(len/2) [i.e. everything smaller than "try"]
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*
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* if the try is too small (thus target is greater than try) then
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* we set the new start to be (try + 1). this means we need to
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* reduce the length to (round(len/2) - 1).
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*
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* note "adjust" below which takes advantage of the fact that
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* (round(len/2) - 1) == trunc((len - 1) / 2)
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* for any value of len we may have
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*/
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for (start = 0, len = vm_nphysseg ; len != 0 ; len = len / 2) {
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try = start + (len / 2); /* try in the middle */
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/* start past our try? */
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if (pframe >= vm_physmem[try].start) {
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/* was try correct? */
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if (pframe < vm_physmem[try].end) {
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if (offp)
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*offp = pframe - vm_physmem[try].start;
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return(try); /* got it */
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}
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start = try + 1; /* next time, start here */
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len--; /* "adjust" */
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} else {
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/*
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* pframe before try, just reduce length of
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* region, done in "for" loop
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*/
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}
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}
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return(-1);
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#else
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/* linear search for it */
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int lcv;
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for (lcv = 0; lcv < vm_nphysseg; lcv++) {
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if (pframe >= vm_physmem[lcv].start &&
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pframe < vm_physmem[lcv].end) {
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if (offp)
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*offp = pframe - vm_physmem[lcv].start;
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return(lcv); /* got it */
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}
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}
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return(-1);
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#endif
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}
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/*
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* IS_VM_PHYSADDR: only used my mips/pmax/pica trap/pmap.
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*/
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#define IS_VM_PHYSADDR(PA) (vm_physseg_find(atop(PA), NULL) != -1)
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/*
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* PHYS_TO_VM_PAGE: find vm_page for a PA. used by MI code to get vm_pages
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* back from an I/O mapping (ugh!). used in some MD code as well.
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*/
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static __inline struct vm_page *
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PHYS_TO_VM_PAGE(pa)
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vm_offset_t pa;
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{
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vm_offset_t pf = atop(pa);
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int off;
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int psi;
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psi = vm_physseg_find(pf, &off);
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if (psi != -1)
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return(&vm_physmem[psi].pgs[off]);
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return(NULL);
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}
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#elif defined(MACHINE_NONCONTIG)
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/* OLD NONCONTIG CODE: NUKE NUKE NUKE ONCE CONVERTED */
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#define IS_VM_PHYSADDR(pa) \
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(pmap_page_index(pa) >= 0)
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#define PHYS_TO_VM_PAGE(pa) \
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(&vm_page_array[pmap_page_index(pa) - first_page])
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#else
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/* OLD CONTIG CODE: NUKE NUKE NUKE ONCE CONVERTED */
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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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#endif /* (OLD) MACHINE_NONCONTIG */
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#if defined(UVM)
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#define VM_PAGE_IS_FREE(entry) ((entry)->pqflags & PQ_FREE)
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#else /* UVM */
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#define VM_PAGE_IS_FREE(entry) ((entry)->flags & PG_FREE)
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#endif /* UVM */
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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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#define PAGE_ASSERT_WAIT(m, interruptible) { \
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(m)->flags |= PG_WANTED; \
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assert_wait((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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thread_wakeup((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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/*
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* XXXCDC: different versions of this should die
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*/
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#if !defined(MACHINE_NONCONTIG) && !defined(MACHINE_NEW_NONCONTIG)
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#define VM_PAGE_INIT(mem, obj, offset) { \
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(mem)->flags = PG_BUSY | PG_CLEAN | PG_FAKE; \
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vm_page_insert((mem), (obj), (offset)); \
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(mem)->wire_count = 0; \
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}
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#else /* MACHINE_NONCONTIG */
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#define VM_PAGE_INIT(mem, obj, offset) { \
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(mem)->flags = PG_BUSY | PG_CLEAN | PG_FAKE; \
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if (obj) \
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vm_page_insert((mem), (obj), (offset)); \
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else \
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(mem)->object = NULL; \
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(mem)->wire_count = 0; \
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}
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#endif /* MACHINE_NONCONTIG */
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|
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#if VM_PAGE_DEBUG
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#if defined(MACHINE_NEW_NONCONTIG)
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|
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/*
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* VM_PAGE_CHECK: debugging check of a vm_page structure
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*/
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static __inline void
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VM_PAGE_CHECK(mem)
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|
struct vm_page *mem;
|
|
{
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int lcv;
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for (lcv = 0 ; lcv < vm_nphysseg ; lcv++) {
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|
if ((unsigned int) mem >= (unsigned int) vm_physmem[lcv].pgs &&
|
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(unsigned int) mem <= (unsigned int) vm_physmem[lcv].lastpg)
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break;
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}
|
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if (lcv == vm_nphysseg ||
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(mem->flags & (PG_ACTIVE|PG_INACTIVE)) == (PG_ACTIVE|PG_INACTIVE))
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panic("vm_page_check: not valid!");
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return;
|
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}
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|
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#elif defined(MACHINE_NONCONTIG)
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/* OLD NONCONTIG CODE: NUKE NUKE NUKE ONCE CONVERTED */
|
|
#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->flags & (PG_ACTIVE | PG_INACTIVE)) == \
|
|
(PG_ACTIVE | PG_INACTIVE))) \
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|
panic("vm_page_check: not valid!"); \
|
|
}
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|
|
|
#else
|
|
|
|
/* OLD CONTIG CODE: NUKE NUKE NUKE ONCE CONVERTED */
|
|
#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->flags & (PG_ACTIVE | PG_INACTIVE)) == \
|
|
(PG_ACTIVE | PG_INACTIVE))) \
|
|
panic("vm_page_check: not valid!"); \
|
|
}
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|
|
|
#endif
|
|
|
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#else /* VM_PAGE_DEBUG */
|
|
#define VM_PAGE_CHECK(mem)
|
|
#endif /* VM_PAGE_DEBUG */
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|
|
|
#endif /* _KERNEL */
|
|
#endif /* !_VM_PAGE_ */
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