vm_page.h revision 60755
15455Sdg/* 21541Srgrimes * Copyright (c) 1991, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * This code is derived from software contributed to Berkeley by 61541Srgrimes * The Mach Operating System project at Carnegie-Mellon University. 71541Srgrimes * 81541Srgrimes * Redistribution and use in source and binary forms, with or without 91541Srgrimes * modification, are permitted provided that the following conditions 101541Srgrimes * are met: 111541Srgrimes * 1. Redistributions of source code must retain the above copyright 121541Srgrimes * notice, this list of conditions and the following disclaimer. 131541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141541Srgrimes * notice, this list of conditions and the following disclaimer in the 151541Srgrimes * documentation and/or other materials provided with the distribution. 161541Srgrimes * 3. All advertising materials mentioning features or use of this software 171541Srgrimes * must display the following acknowledgement: 181541Srgrimes * This product includes software developed by the University of 191541Srgrimes * California, Berkeley and its contributors. 201541Srgrimes * 4. Neither the name of the University nor the names of its contributors 211541Srgrimes * may be used to endorse or promote products derived from this software 221541Srgrimes * without specific prior written permission. 231541Srgrimes * 241541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341541Srgrimes * SUCH DAMAGE. 351541Srgrimes * 361817Sdg * from: @(#)vm_page.h 8.2 (Berkeley) 12/13/93 371541Srgrimes * 381541Srgrimes * 391541Srgrimes * Copyright (c) 1987, 1990 Carnegie-Mellon University. 401541Srgrimes * All rights reserved. 411541Srgrimes * 421541Srgrimes * Authors: Avadis Tevanian, Jr., Michael Wayne Young 435455Sdg * 441541Srgrimes * Permission to use, copy, modify and distribute this software and 451541Srgrimes * its documentation is hereby granted, provided that both the copyright 461541Srgrimes * notice and this permission notice appear in all copies of the 471541Srgrimes * software, derivative works or modified versions, and any portions 481541Srgrimes * thereof, and that both notices appear in supporting documentation. 495455Sdg * 505455Sdg * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 515455Sdg * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 521541Srgrimes * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 535455Sdg * 541541Srgrimes * Carnegie Mellon requests users of this software to return to 551541Srgrimes * 561541Srgrimes * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 571541Srgrimes * School of Computer Science 581541Srgrimes * Carnegie Mellon University 591541Srgrimes * Pittsburgh PA 15213-3890 601541Srgrimes * 611541Srgrimes * any improvements or extensions that they make and grant Carnegie the 621541Srgrimes * rights to redistribute these changes. 631817Sdg * 6450477Speter * $FreeBSD: head/sys/vm/vm_page.h 60755 2000-05-21 12:50:18Z peter $ 651541Srgrimes */ 661541Srgrimes 671541Srgrimes/* 681541Srgrimes * Resident memory system definitions. 691541Srgrimes */ 701541Srgrimes 711541Srgrimes#ifndef _VM_PAGE_ 721541Srgrimes#define _VM_PAGE_ 731541Srgrimes 7444754Sjulian#if !defined(KLD_MODULE) 7537282Sjmg#include "opt_vmpage.h" 7644754Sjulian#endif 7737282Sjmg 786816Sdg#include <vm/pmap.h> 7938517Sdfr#include <machine/atomic.h> 8038517Sdfr 811541Srgrimes/* 821541Srgrimes * Management of resident (logical) pages. 831541Srgrimes * 841541Srgrimes * A small structure is kept for each resident 851541Srgrimes * page, indexed by page number. Each structure 861541Srgrimes * is an element of several lists: 871541Srgrimes * 881541Srgrimes * A hash table bucket used to quickly 891541Srgrimes * perform object/offset lookups 901541Srgrimes * 911541Srgrimes * A list of all pages for a given object, 921541Srgrimes * so they can be quickly deactivated at 931541Srgrimes * time of deallocation. 941541Srgrimes * 951541Srgrimes * An ordered list of pages due for pageout. 961541Srgrimes * 971541Srgrimes * In addition, the structure contains the object 981541Srgrimes * and offset to which this page belongs (for pageout), 991541Srgrimes * and sundry status bits. 1001541Srgrimes * 1011541Srgrimes * Fields in this structure are locked either by the lock on the 1021541Srgrimes * object that the page belongs to (O) or by the lock on the page 1031541Srgrimes * queues (P). 10446349Salc * 10546349Salc * The 'valid' and 'dirty' fields are distinct. A page may have dirty 10646349Salc * bits set without having associated valid bits set. This is used by 10746349Salc * NFS to implement piecemeal writes. 1081541Srgrimes */ 1091541Srgrimes 1101541SrgrimesTAILQ_HEAD(pglist, vm_page); 1111541Srgrimes 1121541Srgrimesstruct vm_page { 1135455Sdg TAILQ_ENTRY(vm_page) pageq; /* queue info for FIFO queue or free list (P) */ 11442957Sdillon struct vm_page *hnext; /* hash table link (O,P) */ 11542957Sdillon TAILQ_ENTRY(vm_page) listq; /* pages in same object (O) */ 1161541Srgrimes 11742957Sdillon vm_object_t object; /* which object am I in (O,P)*/ 11812767Sdyson vm_pindex_t pindex; /* offset into object (O,P) */ 1195455Sdg vm_offset_t phys_addr; /* physical address of page */ 12060755Speter struct md_page md; /* machine dependant stuff */ 12118169Sdyson u_short queue; /* page queue index */ 12218169Sdyson u_short flags, /* see below */ 12318169Sdyson pc; /* page color */ 1245455Sdg u_short wire_count; /* wired down maps refs (P) */ 1255455Sdg short hold_count; /* page hold count */ 12613490Sdyson u_char act_count; /* page usage count */ 12713490Sdyson u_char busy; /* page busy count */ 12813490Sdyson /* NOTE that these must support one bit per DEV_BSIZE in a page!!! */ 12913490Sdyson /* so, on normal X86 kernels, they must be at least 8 bits wide */ 13036735Sdfr#if PAGE_SIZE == 4096 13113490Sdyson u_char valid; /* map of valid DEV_BSIZE chunks */ 13213490Sdyson u_char dirty; /* map of dirty DEV_BSIZE chunks */ 13336735Sdfr#elif PAGE_SIZE == 8192 13436735Sdfr u_short valid; /* map of valid DEV_BSIZE chunks */ 13536735Sdfr u_short dirty; /* map of dirty DEV_BSIZE chunks */ 13636735Sdfr#endif 1371541Srgrimes}; 1381541Srgrimes 13918169Sdyson/* 14051337Sdillon * note: currently use SWAPBLK_NONE as an absolute value rather then 14151337Sdillon * a flag bit. 14242957Sdillon */ 14342957Sdillon 14442957Sdillon#define SWAPBLK_MASK ((daddr_t)((u_daddr_t)-1 >> 1)) /* mask */ 14542957Sdillon#define SWAPBLK_NONE ((daddr_t)((u_daddr_t)SWAPBLK_MASK + 1))/* flag */ 14642957Sdillon 14744754Sjulian#if !defined(KLD_MODULE) 14844754Sjulian 14942957Sdillon/* 15018169Sdyson * Page coloring parameters 15118169Sdyson */ 15243752Sdillon/* Each of PQ_FREE, and PQ_CACHE have PQ_HASH_SIZE entries */ 15318169Sdyson 15418169Sdyson/* Define one of the following */ 15536326Sdyson#if defined(PQ_HUGECACHE) 15636326Sdyson#define PQ_PRIME1 31 /* Prime number somewhat less than PQ_HASH_SIZE */ 15736326Sdyson#define PQ_PRIME2 23 /* Prime number somewhat less than PQ_HASH_SIZE */ 15836326Sdyson#define PQ_L2_SIZE 256 /* A number of colors opt for 1M cache */ 15936326Sdyson#endif 16036326Sdyson 16136326Sdyson/* Define one of the following */ 16218169Sdyson#if defined(PQ_LARGECACHE) 16318169Sdyson#define PQ_PRIME1 31 /* Prime number somewhat less than PQ_HASH_SIZE */ 16418169Sdyson#define PQ_PRIME2 23 /* Prime number somewhat less than PQ_HASH_SIZE */ 16518169Sdyson#define PQ_L2_SIZE 128 /* A number of colors opt for 512K cache */ 16618169Sdyson#endif 16718169Sdyson 16818169Sdyson 16918169Sdyson/* 17018169Sdyson * Use 'options PQ_NOOPT' to disable page coloring 17118169Sdyson */ 17218169Sdyson#if defined(PQ_NOOPT) 17318169Sdyson#define PQ_PRIME1 1 17418169Sdyson#define PQ_PRIME2 1 17518169Sdyson#define PQ_L2_SIZE 1 17618169Sdyson#endif 17718169Sdyson 17818779Sdyson#if defined(PQ_NORMALCACHE) 17918169Sdyson#define PQ_PRIME1 5 /* Prime number somewhat less than PQ_HASH_SIZE */ 18018169Sdyson#define PQ_PRIME2 3 /* Prime number somewhat less than PQ_HASH_SIZE */ 18118169Sdyson#define PQ_L2_SIZE 16 /* A reasonable number of colors (opt for 64K cache) */ 18218169Sdyson#endif 18318169Sdyson 18449666Salc#if defined(PQ_MEDIUMCACHE) 18518779Sdyson#define PQ_PRIME1 13 /* Prime number somewhat less than PQ_HASH_SIZE */ 18618779Sdyson#define PQ_PRIME2 7 /* Prime number somewhat less than PQ_HASH_SIZE */ 18718779Sdyson#define PQ_L2_SIZE 64 /* A number of colors opt for 256K cache */ 18818779Sdyson#endif 18918779Sdyson 19049666Salc#if !defined(PQ_L2_SIZE) 19149666Salc#define PQ_PRIME1 9 /* Produces a good PQ_L2_SIZE/3 + PQ_PRIME1 */ 19249666Salc#define PQ_PRIME2 5 /* Prime number somewhat less than PQ_HASH_SIZE */ 19349666Salc#define PQ_L2_SIZE 32 /* 512KB or smaller, 4-way set-associative cache */ 19449666Salc#endif 19549666Salc 19618169Sdyson#define PQ_L2_MASK (PQ_L2_SIZE - 1) 19718169Sdyson 19849819Salc#if 1 19949813Smjacob#define PQ_NONE 0 20049813Smjacob#define PQ_FREE 1 20149813Smjacob#define PQ_INACTIVE (1 + 1*PQ_L2_SIZE) 20249813Smjacob#define PQ_ACTIVE (2 + 1*PQ_L2_SIZE) 20349813Smjacob#define PQ_CACHE (3 + 1*PQ_L2_SIZE) 20449813Smjacob#define PQ_COUNT (3 + 2*PQ_L2_SIZE) 20549813Smjacob#else 20649720Salc#define PQ_NONE PQ_COUNT 20749720Salc#define PQ_FREE 0 20849720Salc#define PQ_INACTIVE PQ_L2_SIZE 20949720Salc#define PQ_ACTIVE (1 + PQ_L2_SIZE) 21049720Salc#define PQ_CACHE (2 + PQ_L2_SIZE) 21149720Salc#define PQ_COUNT (2 + 2*PQ_L2_SIZE) 21249813Smjacob#endif 21313490Sdyson 21452647Salcstruct vpgqueues { 21552647Salc struct pglist pl; 21618169Sdyson int *cnt; 21749326Salc int lcnt; 21852647Salc}; 21918169Sdyson 22052647Salcextern struct vpgqueues vm_page_queues[PQ_COUNT]; 22152647Salc 22244754Sjulian#endif 22344754Sjulian 2241541Srgrimes/* 2251541Srgrimes * These are the flags defined for vm_page. 2261541Srgrimes * 2271541Srgrimes * Note: PG_FILLED and PG_DIRTY are added for the filesystems. 2281541Srgrimes */ 22942957Sdillon#define PG_BUSY 0x0001 /* page is in transit (O) */ 23042957Sdillon#define PG_WANTED 0x0002 /* someone is waiting for page (O) */ 23142957Sdillon#define PG_FICTITIOUS 0x0008 /* physical page doesn't exist (O) */ 23242957Sdillon#define PG_WRITEABLE 0x0010 /* page is mapped writeable */ 23342957Sdillon#define PG_MAPPED 0x0020 /* page is mapped */ 23442957Sdillon#define PG_ZERO 0x0040 /* page is zeroed */ 23542957Sdillon#define PG_REFERENCED 0x0080 /* page has been referenced */ 23642957Sdillon#define PG_CLEANCHK 0x0100 /* page will be checked for cleaning */ 23742957Sdillon#define PG_SWAPINPROG 0x0200 /* swap I/O in progress on page */ 23854467Sdillon#define PG_NOSYNC 0x0400 /* do not collect for syncer */ 2391541Srgrimes 2409507Sdg/* 2419507Sdg * Misc constants. 2429507Sdg */ 2431541Srgrimes 2449507Sdg#define ACT_DECLINE 1 2459507Sdg#define ACT_ADVANCE 3 24616750Sdyson#define ACT_INIT 5 24718169Sdyson#define ACT_MAX 64 2489507Sdg#define PFCLUSTER_BEHIND 3 2499507Sdg#define PFCLUSTER_AHEAD 3 2509507Sdg 25155206Speter#ifdef _KERNEL 2521541Srgrimes/* 2539507Sdg * Each pageable resident page falls into one of four lists: 2541541Srgrimes * 2555455Sdg * free 2561541Srgrimes * Available for allocation now. 2579507Sdg * 2589507Sdg * The following are all LRU sorted: 2599507Sdg * 2609507Sdg * cache 2619507Sdg * Almost available for allocation. Still in an 2629507Sdg * object, but clean and immediately freeable at 2639507Sdg * non-interrupt times. 2649507Sdg * 2651541Srgrimes * inactive 26613765Smpp * Low activity, candidates for reclamation. 2671541Srgrimes * This is the list of pages that should be 2681541Srgrimes * paged out next. 2699507Sdg * 2701541Srgrimes * active 2719507Sdg * Pages that are "active" i.e. they have been 2729507Sdg * recently referenced. 27310544Sdyson * 27410544Sdyson * zero 27510544Sdyson * Pages that are really free and have been pre-zeroed 27610544Sdyson * 2771541Srgrimes */ 2781541Srgrimes 27912767Sdysonextern int vm_page_zero_count; 28012767Sdyson 2815455Sdgextern vm_page_t vm_page_array; /* First resident page in table */ 28260755Speterextern int vm_page_array_size; /* number of vm_page_t's */ 2835455Sdgextern long first_page; /* first physical page number */ 2841541Srgrimes 2851541Srgrimes#define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr) 2861541Srgrimes 2871541Srgrimes#define PHYS_TO_VM_PAGE(pa) \ 2881541Srgrimes (&vm_page_array[atop(pa) - first_page ]) 2891541Srgrimes 2901541Srgrimes/* 2911541Srgrimes * Functions implemented as macros 2921541Srgrimes */ 2931541Srgrimes 29438799Sdfrstatic __inline void 29538799Sdfrvm_page_flag_set(vm_page_t m, unsigned int bits) 29638799Sdfr{ 29738799Sdfr atomic_set_short(&(m)->flags, bits); 29838799Sdfr} 29938517Sdfr 30038799Sdfrstatic __inline void 30138799Sdfrvm_page_flag_clear(vm_page_t m, unsigned int bits) 30238799Sdfr{ 30338799Sdfr atomic_clear_short(&(m)->flags, bits); 30438799Sdfr} 30538517Sdfr 30638799Sdfr#if 0 30738799Sdfrstatic __inline void 30838799Sdfrvm_page_assert_wait(vm_page_t m, int interruptible) 30938799Sdfr{ 31038799Sdfr vm_page_flag_set(m, PG_WANTED); 31138799Sdfr assert_wait((int) m, interruptible); 31233936Sdyson} 31338799Sdfr#endif 3141541Srgrimes 31538799Sdfrstatic __inline void 31638799Sdfrvm_page_busy(vm_page_t m) 31738799Sdfr{ 31843122Sdillon KASSERT((m->flags & PG_BUSY) == 0, ("vm_page_busy: page already busy!!!")); 31938799Sdfr vm_page_flag_set(m, PG_BUSY); 32033936Sdyson} 3211541Srgrimes 32242957Sdillon/* 32342957Sdillon * vm_page_flash: 32442957Sdillon * 32542957Sdillon * wakeup anyone waiting for the page. 32642957Sdillon */ 32742957Sdillon 32838799Sdfrstatic __inline void 32942957Sdillonvm_page_flash(vm_page_t m) 33038799Sdfr{ 33138799Sdfr if (m->flags & PG_WANTED) { 33238799Sdfr vm_page_flag_clear(m, PG_WANTED); 33338799Sdfr wakeup(m); 33438799Sdfr } 33538799Sdfr} 33638517Sdfr 33742957Sdillon/* 33842957Sdillon * vm_page_wakeup: 33942957Sdillon * 34042957Sdillon * clear the PG_BUSY flag and wakeup anyone waiting for the 34142957Sdillon * page. 34242957Sdillon * 34342957Sdillon */ 34442957Sdillon 34538799Sdfrstatic __inline void 34642957Sdillonvm_page_wakeup(vm_page_t m) 34742957Sdillon{ 34843122Sdillon KASSERT(m->flags & PG_BUSY, ("vm_page_wakeup: page not busy!!!")); 34942957Sdillon vm_page_flag_clear(m, PG_BUSY); 35042957Sdillon vm_page_flash(m); 35142957Sdillon} 35242957Sdillon 35343134Sdillon/* 35443134Sdillon * 35543134Sdillon * 35643134Sdillon */ 35743134Sdillon 35842957Sdillonstatic __inline void 35938799Sdfrvm_page_io_start(vm_page_t m) 36038799Sdfr{ 36138799Sdfr atomic_add_char(&(m)->busy, 1); 36234206Sdyson} 36334206Sdyson 36438799Sdfrstatic __inline void 36538799Sdfrvm_page_io_finish(vm_page_t m) 36638799Sdfr{ 36738799Sdfr atomic_subtract_char(&m->busy, 1); 36842957Sdillon if (m->busy == 0) 36942957Sdillon vm_page_flash(m); 37038799Sdfr} 37134206Sdyson 37238799Sdfr 3735455Sdg#if PAGE_SIZE == 4096 3745455Sdg#define VM_PAGE_BITS_ALL 0xff 3755455Sdg#endif 3761541Srgrimes 3775455Sdg#if PAGE_SIZE == 8192 3785455Sdg#define VM_PAGE_BITS_ALL 0xffff 3795455Sdg#endif 3801549Srgrimes 38133109Sdyson#define VM_ALLOC_NORMAL 0 38233109Sdyson#define VM_ALLOC_INTERRUPT 1 38333109Sdyson#define VM_ALLOC_SYSTEM 2 38433109Sdyson#define VM_ALLOC_ZERO 3 38533109Sdyson#define VM_ALLOC_RETRY 0x80 3865455Sdg 3875455Sdgvoid vm_page_activate __P((vm_page_t)); 38812767Sdysonvm_page_t vm_page_alloc __P((vm_object_t, vm_pindex_t, int)); 38933109Sdysonvm_page_t vm_page_grab __P((vm_object_t, vm_pindex_t, int)); 3906357Sphkvoid vm_page_cache __P((register vm_page_t)); 39151337Sdillonvoid vm_page_dontneed __P((register vm_page_t)); 39215811Sdysonstatic __inline void vm_page_copy __P((vm_page_t, vm_page_t)); 39342957Sdillonstatic __inline void vm_page_free __P((vm_page_t)); 39442957Sdillonstatic __inline void vm_page_free_zero __P((vm_page_t)); 3955455Sdgvoid vm_page_deactivate __P((vm_page_t)); 39612767Sdysonvoid vm_page_insert __P((vm_page_t, vm_object_t, vm_pindex_t)); 39712767Sdysonvm_page_t vm_page_lookup __P((vm_object_t, vm_pindex_t)); 39844051Sdillonvoid vm_page_remove __P((vm_page_t)); 39912767Sdysonvoid vm_page_rename __P((vm_page_t, vm_object_t, vm_pindex_t)); 4005455Sdgvm_offset_t vm_page_startup __P((vm_offset_t, vm_offset_t, vm_offset_t)); 40160755Spetervm_page_t vm_add_new_page __P((vm_offset_t pa)); 40240700Sdgvoid vm_page_unwire __P((vm_page_t, int)); 4035455Sdgvoid vm_page_wire __P((vm_page_t)); 40417334Sdysonvoid vm_page_unqueue __P((vm_page_t)); 40517334Sdysonvoid vm_page_unqueue_nowakeup __P((vm_page_t)); 40610544Sdysonvoid vm_page_set_validclean __P((vm_page_t, int, int)); 40746349Salcvoid vm_page_set_dirty __P((vm_page_t, int, int)); 40846349Salcvoid vm_page_clear_dirty __P((vm_page_t, int, int)); 4095455Sdgvoid vm_page_set_invalid __P((vm_page_t, int, int)); 41015811Sdysonstatic __inline boolean_t vm_page_zero_fill __P((vm_page_t)); 4115455Sdgint vm_page_is_valid __P((vm_page_t, int, int)); 4125455Sdgvoid vm_page_test_dirty __P((vm_page_t)); 4136357Sphkint vm_page_bits __P((int, int)); 41443747Sdillonvm_page_t _vm_page_list_find __P((int, int)); 41542957Sdillon#if 0 41633936Sdysonint vm_page_sleep(vm_page_t m, char *msg, char *busy); 41742957Sdillonint vm_page_asleep(vm_page_t m, char *msg, char *busy); 41842957Sdillon#endif 41945347Sjulianvoid vm_page_zero_invalid(vm_page_t m, boolean_t setvalid); 42043752Sdillonvoid vm_page_free_toq(vm_page_t m); 4215455Sdg 4221549Srgrimes/* 4231549Srgrimes * Keep page from being freed by the page daemon 4241549Srgrimes * much of the same effect as wiring, except much lower 4251549Srgrimes * overhead and should be used only for *very* temporary 4261549Srgrimes * holding ("wiring"). 4271549Srgrimes */ 4288010Sbdestatic __inline void 4294461Sbdevm_page_hold(vm_page_t mem) 4301549Srgrimes{ 4311549Srgrimes mem->hold_count++; 4321549Srgrimes} 4331549Srgrimes 4348010Sbdestatic __inline void 4354461Sbdevm_page_unhold(vm_page_t mem) 4361549Srgrimes{ 4373660Sdg --mem->hold_count; 43842408Seivind KASSERT(mem->hold_count >= 0, ("vm_page_unhold: hold count < 0!!!")); 4391549Srgrimes} 4401549Srgrimes 44143122Sdillon/* 44243122Sdillon * vm_page_protect: 44343122Sdillon * 44454467Sdillon * Reduce the protection of a page. This routine never raises the 44554467Sdillon * protection and therefore can be safely called if the page is already 44654467Sdillon * at VM_PROT_NONE (it will be a NOP effectively ). 44743122Sdillon */ 44843122Sdillon 4498010Sbdestatic __inline void 4506816Sdgvm_page_protect(vm_page_t mem, int prot) 4516816Sdg{ 4526816Sdg if (prot == VM_PROT_NONE) { 4536816Sdg if (mem->flags & (PG_WRITEABLE|PG_MAPPED)) { 45460755Speter pmap_page_protect(mem, VM_PROT_NONE); 45538799Sdfr vm_page_flag_clear(mem, PG_WRITEABLE|PG_MAPPED); 4566816Sdg } 4576816Sdg } else if ((prot == VM_PROT_READ) && (mem->flags & PG_WRITEABLE)) { 45860755Speter pmap_page_protect(mem, VM_PROT_READ); 45938799Sdfr vm_page_flag_clear(mem, PG_WRITEABLE); 4606816Sdg } 4616816Sdg} 4626816Sdg 46315811Sdyson/* 46415811Sdyson * vm_page_zero_fill: 46515811Sdyson * 46615811Sdyson * Zero-fill the specified page. 46715811Sdyson * Written as a standard pagein routine, to 46815811Sdyson * be used by the zero-fill object. 46915811Sdyson */ 47015811Sdysonstatic __inline boolean_t 47115811Sdysonvm_page_zero_fill(m) 47215811Sdyson vm_page_t m; 47315811Sdyson{ 47415811Sdyson pmap_zero_page(VM_PAGE_TO_PHYS(m)); 47515811Sdyson return (TRUE); 47615811Sdyson} 4776816Sdg 47815811Sdyson/* 47915811Sdyson * vm_page_copy: 48015811Sdyson * 48115811Sdyson * Copy one page to another 48215811Sdyson */ 48315811Sdysonstatic __inline void 48415811Sdysonvm_page_copy(src_m, dest_m) 48515811Sdyson vm_page_t src_m; 48615811Sdyson vm_page_t dest_m; 48715811Sdyson{ 48815811Sdyson pmap_copy_page(VM_PAGE_TO_PHYS(src_m), VM_PAGE_TO_PHYS(dest_m)); 48915811Sdyson dest_m->valid = VM_PAGE_BITS_ALL; 49015811Sdyson} 49115811Sdyson 49242957Sdillon/* 49342957Sdillon * vm_page_free: 49442957Sdillon * 49542957Sdillon * Free a page 49643752Sdillon * 49743752Sdillon * The clearing of PG_ZERO is a temporary safety until the code can be 49843752Sdillon * reviewed to determine that PG_ZERO is being properly cleared on 49943752Sdillon * write faults or maps. PG_ZERO was previously cleared in 50043752Sdillon * vm_page_alloc(). 50142957Sdillon */ 50242957Sdillonstatic __inline void 50342957Sdillonvm_page_free(m) 50442957Sdillon vm_page_t m; 50542957Sdillon{ 50643752Sdillon vm_page_flag_clear(m, PG_ZERO); 50743752Sdillon vm_page_free_toq(m); 50842957Sdillon} 50942957Sdillon 51042957Sdillon/* 51142957Sdillon * vm_page_free_zero: 51242957Sdillon * 51342957Sdillon * Free a page to the zerod-pages queue 51442957Sdillon */ 51542957Sdillonstatic __inline void 51642957Sdillonvm_page_free_zero(m) 51742957Sdillon vm_page_t m; 51842957Sdillon{ 51943752Sdillon vm_page_flag_set(m, PG_ZERO); 52043752Sdillon vm_page_free_toq(m); 52142957Sdillon} 52242957Sdillon 52342957Sdillon/* 52442957Sdillon * vm_page_sleep_busy: 52542957Sdillon * 52642957Sdillon * Wait until page is no longer PG_BUSY or (if also_m_busy is TRUE) 52742957Sdillon * m->busy is zero. Returns TRUE if it had to sleep ( including if 52842957Sdillon * it almost had to sleep and made temporary spl*() mods), FALSE 52942957Sdillon * otherwise. 53042957Sdillon * 53142957Sdillon * This routine assumes that interrupts can only remove the busy 53242957Sdillon * status from a page, not set the busy status or change it from 53342957Sdillon * PG_BUSY to m->busy or vise versa (which would create a timing 53442957Sdillon * window). 53542957Sdillon * 53642957Sdillon * Note that being an inline, this code will be well optimized. 53742957Sdillon */ 53842957Sdillon 53942957Sdillonstatic __inline int 54042957Sdillonvm_page_sleep_busy(vm_page_t m, int also_m_busy, const char *msg) 54142957Sdillon{ 54242957Sdillon if ((m->flags & PG_BUSY) || (also_m_busy && m->busy)) { 54342957Sdillon int s = splvm(); 54442957Sdillon if ((m->flags & PG_BUSY) || (also_m_busy && m->busy)) { 54542957Sdillon /* 54642957Sdillon * Page is busy. Wait and retry. 54742957Sdillon */ 54842957Sdillon vm_page_flag_set(m, PG_WANTED | PG_REFERENCED); 54942957Sdillon tsleep(m, PVM, msg, 0); 55042957Sdillon } 55142957Sdillon splx(s); 55242957Sdillon return(TRUE); 55342957Sdillon /* not reached */ 55442957Sdillon } 55542957Sdillon return(FALSE); 55642957Sdillon} 55742957Sdillon 55843134Sdillon/* 55943134Sdillon * vm_page_dirty: 56043134Sdillon * 56143134Sdillon * make page all dirty 56243134Sdillon */ 56343134Sdillon 56443134Sdillonstatic __inline void 56543134Sdillonvm_page_dirty(vm_page_t m) 56643134Sdillon{ 56749991Sgreen#if !defined(KLD_MODULE) 56843134Sdillon KASSERT(m->queue - m->pc != PQ_CACHE, ("vm_page_dirty: page in cache!")); 56949991Sgreen#endif 57043134Sdillon m->dirty = VM_PAGE_BITS_ALL; 57143134Sdillon} 57243134Sdillon 57349945Salc/* 57449945Salc * vm_page_undirty: 57549945Salc * 57649945Salc * Set page to not be dirty. Note: does not clear pmap modify bits 57749945Salc */ 57849945Salc 57949945Salcstatic __inline void 58049945Salcvm_page_undirty(vm_page_t m) 58149945Salc{ 58249945Salc m->dirty = 0; 58349945Salc} 58449945Salc 58549991Sgreen#if !defined(KLD_MODULE) 58649991Sgreen 58743747Sdillonstatic __inline vm_page_t 58843752Sdillonvm_page_list_find(int basequeue, int index, boolean_t prefer_zero) 58943747Sdillon{ 59043747Sdillon vm_page_t m; 59143134Sdillon 59243747Sdillon#if PQ_L2_SIZE > 1 59343752Sdillon if (prefer_zero) { 59452647Salc m = TAILQ_LAST(&vm_page_queues[basequeue+index].pl, pglist); 59543752Sdillon } else { 59652647Salc m = TAILQ_FIRST(&vm_page_queues[basequeue+index].pl); 59743752Sdillon } 59843747Sdillon if (m == NULL) 59943747Sdillon m = _vm_page_list_find(basequeue, index); 60043747Sdillon#else 60143752Sdillon if (prefer_zero) { 60252647Salc m = TAILQ_LAST(&vm_page_queues[basequeue].pl, pglist); 60343752Sdillon } else { 60452647Salc m = TAILQ_FIRST(&vm_page_queues[basequeue].pl); 60543752Sdillon } 60643747Sdillon#endif 60743747Sdillon return(m); 60843747Sdillon} 60943747Sdillon 61044754Sjulian#endif 61144754Sjulian 61255206Speter#endif /* _KERNEL */ 6135455Sdg#endif /* !_VM_PAGE_ */ 614