413 lines
13 KiB
C++
413 lines
13 KiB
C++
/* $NetBSD: uvm_page.h,v 1.52 2008/02/27 19:38:57 matt Exp $ */
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/*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* Copyright (c) 1991, 1993, The Regents of the University of California.
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*
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* 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 Charles D. Cranor,
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* Washington University, the University of California, Berkeley and
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* 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 7.3 (Berkeley) 4/21/91
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* from: Id: uvm_page.h,v 1.1.2.6 1998/02/04 02:31:42 chuck Exp
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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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* 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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#ifndef _UVM_UVM_PAGE_H_
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#define _UVM_UVM_PAGE_H_
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/*
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* uvm_page.h
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*/
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/*
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* Resident memory system definitions.
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*/
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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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/*
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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. so, we've separated things
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* 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 <uvm/uvm_pglist.h>
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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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struct vm_anon *uanon; /* anon (O,P) */
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struct uvm_object *uobject; /* object (O,P) */
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voff_t offset; /* offset into object (O,P) */
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uint16_t flags; /* object flags [O] */
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uint16_t 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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uint16_t wire_count; /* wired down map refs [P] */
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uint16_t pqflags; /* page queue flags [P] */
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paddr_t phys_addr; /* physical address of page */
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#ifdef __HAVE_VM_PAGE_MD
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struct vm_page_md mdpage; /* pmap-specific data */
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#endif
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#if 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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lwpid_t lowner; /* lwp that set PG_BUSY */
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const 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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/*
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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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* PG_ZERO is used to indicate that a page has been pre-zero'd. This flag
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* is only set when the page is on no queues, and is cleared when the page
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* is placed on the free list.
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*/
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#define PG_BUSY 0x0001 /* page is locked */
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#define PG_WANTED 0x0002 /* someone is waiting for page */
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#define PG_TABLED 0x0004 /* page is in VP table */
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#define PG_CLEAN 0x0008 /* page has not been modified */
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#define PG_PAGEOUT 0x0010 /* page to be freed for pagedaemon */
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#define PG_RELEASED 0x0020 /* page to be freed when unbusied */
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#define PG_FAKE 0x0040 /* page is not yet initialized */
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#define PG_RDONLY 0x0080 /* page must be mapped read-only */
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#define PG_ZERO 0x0100 /* page is pre-zero'd */
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#define PG_PAGER1 0x1000 /* pager-specific flag */
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#define UVM_PGFLAGBITS \
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"\20\1BUSY\2WANTED\3TABLED\4CLEAN\5PAGEOUT\6RELEASED\7FAKE\10RDONLY" \
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"\11ZERO\15PAGER1"
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#define PQ_FREE 0x0001 /* page is on free list */
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#define PQ_ANON 0x0002 /* page is part of an anon, rather
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than an uvm_object */
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#define PQ_AOBJ 0x0004 /* 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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#define PQ_READAHEAD 0x0008 /* read-ahead but has not been "hit" yet */
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#define PQ_PRIVATE1 0x0100
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#define PQ_PRIVATE2 0x0200
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#define PQ_PRIVATE3 0x0400
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#define PQ_PRIVATE4 0x0800
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#define PQ_PRIVATE5 0x1000
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#define PQ_PRIVATE6 0x2000
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#define PQ_PRIVATE7 0x4000
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#define PQ_PRIVATE8 0x8000
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#define UVM_PQFLAGBITS \
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"\20\1FREE\2ANON\3AOBJ\4READAHEAD" \
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"\11PRIVATE1\12PRIVATE2\13PRIVATE3\14PRIVATE4" \
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"\15PRIVATE5\16PRIVATE6\17PRIVATE7\20PRIVATE8"
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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 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_physseg: describes one segment of physical memory
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*/
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struct vm_physseg {
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paddr_t start; /* PF# of first page in segment */
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paddr_t end; /* (PF# of last page in segment) + 1 */
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paddr_t avail_start; /* PF# of first free page in segment */
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paddr_t avail_end; /* (PF# of last free page in segment) +1 */
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int free_list; /* which free list they belong on */
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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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#ifdef __HAVE_PMAP_PHYSSEG
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struct pmap_physseg pmseg; /* pmap specific (MD) data */
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#endif
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};
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#ifdef _KERNEL
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/*
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* globals
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*/
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extern bool vm_page_zero_enable;
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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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/*
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* prototypes: the following prototypes define the interface to pages
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*/
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void uvm_page_init(vaddr_t *, vaddr_t *);
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#if defined(UVM_PAGE_TRKOWN)
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void uvm_page_own(struct vm_page *, const char *);
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#endif
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#if !defined(PMAP_STEAL_MEMORY)
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bool uvm_page_physget(paddr_t *);
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#endif
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void uvm_page_rehash(void);
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void uvm_page_recolor(int);
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void uvm_pageidlezero(void);
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void uvm_pageactivate(struct vm_page *);
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vaddr_t uvm_pageboot_alloc(vsize_t);
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void uvm_pagecopy(struct vm_page *, struct vm_page *);
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void uvm_pagedeactivate(struct vm_page *);
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void uvm_pagedequeue(struct vm_page *);
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void uvm_pageenqueue(struct vm_page *);
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void uvm_pagefree(struct vm_page *);
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void uvm_page_unbusy(struct vm_page **, int);
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struct vm_page *uvm_pagelookup(struct uvm_object *, voff_t);
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void uvm_pageunwire(struct vm_page *);
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void uvm_pagewait(struct vm_page *, int);
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void uvm_pagewake(struct vm_page *);
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void uvm_pagewire(struct vm_page *);
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void uvm_pagezero(struct vm_page *);
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int uvm_page_lookup_freelist(struct vm_page *);
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static struct vm_page *PHYS_TO_VM_PAGE(paddr_t);
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static int vm_physseg_find(paddr_t, int *);
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/*
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* macros
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*/
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#define UVM_PAGE_HASH_PENALTY 4 /* XXX: a guess */
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#define uvm_pagehash(obj,off) \
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(((unsigned long)obj+(unsigned long)atop(off)) & uvm.page_hashmask)
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#define UVM_PAGEZERO_TARGET (uvmexp.free)
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#define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr)
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/*
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* Compute the page color bucket for a given page.
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*/
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#define VM_PGCOLOR_BUCKET(pg) \
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(atop(VM_PAGE_TO_PHYS((pg))) & uvmexp.colormask)
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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(paddr_t pframe, 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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u_int start, len, try;
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/*
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* if try is too large (thus target is less 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(paddr_t pa)
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{
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paddr_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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#define VM_PAGE_IS_FREE(entry) ((entry)->pqflags & PQ_FREE)
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#ifdef DEBUG
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void uvm_pagezerocheck(struct vm_page *);
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#endif /* DEBUG */
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#endif /* _KERNEL */
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#endif /* _UVM_UVM_PAGE_H_ */
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