The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_page.h

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    1 /*-
    2  * Copyright (c) 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * The Mach Operating System project at Carnegie-Mellon University.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)vm_page.h     8.2 (Berkeley) 12/13/93
   33  *
   34  *
   35  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
   36  * All rights reserved.
   37  *
   38  * Authors: Avadis Tevanian, Jr., Michael Wayne Young
   39  *
   40  * Permission to use, copy, modify and distribute this software and
   41  * its documentation is hereby granted, provided that both the copyright
   42  * notice and this permission notice appear in all copies of the
   43  * software, derivative works or modified versions, and any portions
   44  * thereof, and that both notices appear in supporting documentation.
   45  *
   46  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   47  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   48  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   49  *
   50  * Carnegie Mellon requests users of this software to return to
   51  *
   52  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   53  *  School of Computer Science
   54  *  Carnegie Mellon University
   55  *  Pittsburgh PA 15213-3890
   56  *
   57  * any improvements or extensions that they make and grant Carnegie the
   58  * rights to redistribute these changes.
   59  *
   60  * $FreeBSD$
   61  */
   62 
   63 /*
   64  *      Resident memory system definitions.
   65  */
   66 
   67 #ifndef _VM_PAGE_
   68 #define _VM_PAGE_
   69 
   70 #include <vm/pmap.h>
   71 
   72 /*
   73  *      Management of resident (logical) pages.
   74  *
   75  *      A small structure is kept for each resident
   76  *      page, indexed by page number.  Each structure
   77  *      is an element of several collections:
   78  *
   79  *              A radix tree used to quickly
   80  *              perform object/offset lookups
   81  *
   82  *              A list of all pages for a given object,
   83  *              so they can be quickly deactivated at
   84  *              time of deallocation.
   85  *
   86  *              An ordered list of pages due for pageout.
   87  *
   88  *      In addition, the structure contains the object
   89  *      and offset to which this page belongs (for pageout),
   90  *      and sundry status bits.
   91  *
   92  *      In general, operations on this structure's mutable fields are
   93  *      synchronized using either one of or a combination of the lock on the
   94  *      object that the page belongs to (O), the pool lock for the page (P),
   95  *      or the lock for either the free or paging queue (Q).  If a field is
   96  *      annotated below with two of these locks, then holding either lock is
   97  *      sufficient for read access, but both locks are required for write
   98  *      access.
   99  *
  100  *      In contrast, the synchronization of accesses to the page's
  101  *      dirty field is machine dependent (M).  In the
  102  *      machine-independent layer, the lock on the object that the
  103  *      page belongs to must be held in order to operate on the field.
  104  *      However, the pmap layer is permitted to set all bits within
  105  *      the field without holding that lock.  If the underlying
  106  *      architecture does not support atomic read-modify-write
  107  *      operations on the field's type, then the machine-independent
  108  *      layer uses a 32-bit atomic on the aligned 32-bit word that
  109  *      contains the dirty field.  In the machine-independent layer,
  110  *      the implementation of read-modify-write operations on the
  111  *      field is encapsulated in vm_page_clear_dirty_mask().
  112  */
  113 
  114 #if PAGE_SIZE == 4096
  115 #define VM_PAGE_BITS_ALL 0xffu
  116 typedef uint8_t vm_page_bits_t;
  117 #elif PAGE_SIZE == 8192
  118 #define VM_PAGE_BITS_ALL 0xffffu
  119 typedef uint16_t vm_page_bits_t;
  120 #elif PAGE_SIZE == 16384
  121 #define VM_PAGE_BITS_ALL 0xffffffffu
  122 typedef uint32_t vm_page_bits_t;
  123 #elif PAGE_SIZE == 32768
  124 #define VM_PAGE_BITS_ALL 0xfffffffffffffffflu
  125 typedef uint64_t vm_page_bits_t;
  126 #endif
  127 
  128 struct vm_page {
  129         union {
  130                 TAILQ_ENTRY(vm_page) q; /* page queue or free list (Q) */
  131                 struct {
  132                         SLIST_ENTRY(vm_page) ss; /* private slists */
  133                         void *pv;
  134                 } s;
  135                 struct {
  136                         u_long p;
  137                         u_long v;
  138                 } memguard;
  139         } plinks;
  140         TAILQ_ENTRY(vm_page) listq;     /* pages in same object (O) */
  141         vm_object_t object;             /* which object am I in (O,P) */
  142         vm_pindex_t pindex;             /* offset into object (O,P) */
  143         vm_paddr_t phys_addr;           /* physical address of page */
  144         struct md_page md;              /* machine dependant stuff */
  145         u_int wire_count;               /* wired down maps refs (P) */
  146         volatile u_int busy_lock;       /* busy owners lock */
  147         uint16_t hold_count;            /* page hold count (P) */
  148         uint16_t flags;                 /* page PG_* flags (P) */
  149         uint8_t aflags;                 /* access is atomic */
  150         uint8_t oflags;                 /* page VPO_* flags (O) */
  151         uint8_t queue;                  /* page queue index (P,Q) */
  152         int8_t segind;
  153         uint8_t order;                  /* index of the buddy queue */
  154         uint8_t pool;
  155         u_char  act_count;              /* page usage count (P) */
  156         /* NOTE that these must support one bit per DEV_BSIZE in a page */
  157         /* so, on normal X86 kernels, they must be at least 8 bits wide */
  158         vm_page_bits_t valid;           /* map of valid DEV_BSIZE chunks (O) */
  159         vm_page_bits_t dirty;           /* map of dirty DEV_BSIZE chunks (M) */
  160         int8_t psind;                   /* pagesizes[] index (O) */
  161 };
  162 
  163 /*
  164  * Page flags stored in oflags:
  165  *
  166  * Access to these page flags is synchronized by the lock on the object
  167  * containing the page (O).
  168  *
  169  * Note: VPO_UNMANAGED (used by OBJT_DEVICE, OBJT_PHYS and OBJT_SG)
  170  *       indicates that the page is not under PV management but
  171  *       otherwise should be treated as a normal page.  Pages not
  172  *       under PV management cannot be paged out via the
  173  *       object/vm_page_t because there is no knowledge of their pte
  174  *       mappings, and such pages are also not on any PQ queue.
  175  *
  176  */
  177 #define VPO_UNUSED01    0x01            /* --available-- */
  178 #define VPO_SWAPSLEEP   0x02            /* waiting for swap to finish */
  179 #define VPO_UNMANAGED   0x04            /* no PV management for page */
  180 #define VPO_SWAPINPROG  0x08            /* swap I/O in progress on page */
  181 #define VPO_NOSYNC      0x10            /* do not collect for syncer */
  182 
  183 /*
  184  * Busy page implementation details.
  185  * The algorithm is taken mostly by rwlock(9) and sx(9) locks implementation,
  186  * even if the support for owner identity is removed because of size
  187  * constraints.  Checks on lock recursion are then not possible, while the
  188  * lock assertions effectiveness is someway reduced.
  189  */
  190 #define VPB_BIT_SHARED          0x01
  191 #define VPB_BIT_EXCLUSIVE       0x02
  192 #define VPB_BIT_WAITERS         0x04
  193 #define VPB_BIT_FLAGMASK                                                \
  194         (VPB_BIT_SHARED | VPB_BIT_EXCLUSIVE | VPB_BIT_WAITERS)
  195 
  196 #define VPB_SHARERS_SHIFT       3
  197 #define VPB_SHARERS(x)                                                  \
  198         (((x) & ~VPB_BIT_FLAGMASK) >> VPB_SHARERS_SHIFT)
  199 #define VPB_SHARERS_WORD(x)     ((x) << VPB_SHARERS_SHIFT | VPB_BIT_SHARED)
  200 #define VPB_ONE_SHARER          (1 << VPB_SHARERS_SHIFT)
  201 
  202 #define VPB_SINGLE_EXCLUSIVER   VPB_BIT_EXCLUSIVE
  203 
  204 #define VPB_UNBUSIED            VPB_SHARERS_WORD(0)
  205 
  206 #define PQ_NONE         255
  207 #define PQ_INACTIVE     0
  208 #define PQ_ACTIVE       1
  209 #define PQ_COUNT        2
  210 
  211 TAILQ_HEAD(pglist, vm_page);
  212 SLIST_HEAD(spglist, vm_page);
  213 
  214 struct vm_pagequeue {
  215         struct mtx      pq_mutex;
  216         struct pglist   pq_pl;
  217         int             pq_cnt;
  218         u_int           * const pq_vcnt;
  219         const char      * const pq_name;
  220 } __aligned(CACHE_LINE_SIZE);
  221 
  222 
  223 struct vm_domain {
  224         struct vm_pagequeue vmd_pagequeues[PQ_COUNT];
  225         u_int vmd_page_count;
  226         u_int vmd_free_count;
  227         long vmd_segs;  /* bitmask of the segments */
  228         boolean_t vmd_oom;
  229         int vmd_pass;   /* local pagedaemon pass */
  230         int vmd_oom_seq;
  231         int vmd_last_active_scan;
  232         struct vm_page vmd_marker; /* marker for pagedaemon private use */
  233 };
  234 
  235 extern struct vm_domain vm_dom[MAXMEMDOM];
  236 
  237 #define vm_pagequeue_assert_locked(pq)  mtx_assert(&(pq)->pq_mutex, MA_OWNED)
  238 #define vm_pagequeue_lock(pq)           mtx_lock(&(pq)->pq_mutex)
  239 #define vm_pagequeue_unlock(pq)         mtx_unlock(&(pq)->pq_mutex)
  240 
  241 #ifdef _KERNEL
  242 static __inline void
  243 vm_pagequeue_cnt_add(struct vm_pagequeue *pq, int addend)
  244 {
  245 
  246 #ifdef notyet
  247         vm_pagequeue_assert_locked(pq);
  248 #endif
  249         pq->pq_cnt += addend;
  250         atomic_add_int(pq->pq_vcnt, addend);
  251 }
  252 #define vm_pagequeue_cnt_inc(pq)        vm_pagequeue_cnt_add((pq), 1)
  253 #define vm_pagequeue_cnt_dec(pq)        vm_pagequeue_cnt_add((pq), -1)
  254 #endif  /* _KERNEL */
  255 
  256 extern struct mtx_padalign vm_page_queue_free_mtx;
  257 extern struct mtx_padalign pa_lock[];
  258 
  259 #if defined(__arm__)
  260 #define PDRSHIFT        PDR_SHIFT
  261 #elif !defined(PDRSHIFT)
  262 #define PDRSHIFT        21
  263 #endif
  264 
  265 #define pa_index(pa)    ((pa) >> PDRSHIFT)
  266 #define PA_LOCKPTR(pa)  ((struct mtx *)(&pa_lock[pa_index(pa) % PA_LOCK_COUNT]))
  267 #define PA_LOCKOBJPTR(pa)       ((struct lock_object *)PA_LOCKPTR((pa)))
  268 #define PA_LOCK(pa)     mtx_lock(PA_LOCKPTR(pa))
  269 #define PA_TRYLOCK(pa)  mtx_trylock(PA_LOCKPTR(pa))
  270 #define PA_UNLOCK(pa)   mtx_unlock(PA_LOCKPTR(pa))
  271 #define PA_UNLOCK_COND(pa)                      \
  272         do {                                    \
  273                 if ((pa) != 0) {                \
  274                         PA_UNLOCK((pa));        \
  275                         (pa) = 0;               \
  276                 }                               \
  277         } while (0)
  278 
  279 #define PA_LOCK_ASSERT(pa, a)   mtx_assert(PA_LOCKPTR(pa), (a))
  280 
  281 #ifdef KLD_MODULE
  282 #define vm_page_lock(m)         vm_page_lock_KBI((m), LOCK_FILE, LOCK_LINE)
  283 #define vm_page_unlock(m)       vm_page_unlock_KBI((m), LOCK_FILE, LOCK_LINE)
  284 #define vm_page_trylock(m)      vm_page_trylock_KBI((m), LOCK_FILE, LOCK_LINE)
  285 #else   /* !KLD_MODULE */
  286 #define vm_page_lockptr(m)      (PA_LOCKPTR(VM_PAGE_TO_PHYS((m))))
  287 #define vm_page_lock(m)         mtx_lock(vm_page_lockptr((m)))
  288 #define vm_page_unlock(m)       mtx_unlock(vm_page_lockptr((m)))
  289 #define vm_page_trylock(m)      mtx_trylock(vm_page_lockptr((m)))
  290 #endif
  291 #if defined(INVARIANTS)
  292 #define vm_page_assert_locked(m)                \
  293     vm_page_assert_locked_KBI((m), __FILE__, __LINE__)
  294 #define vm_page_lock_assert(m, a)               \
  295     vm_page_lock_assert_KBI((m), (a), __FILE__, __LINE__)
  296 #else
  297 #define vm_page_assert_locked(m)
  298 #define vm_page_lock_assert(m, a)
  299 #endif
  300 
  301 /*
  302  * The vm_page's aflags are updated using atomic operations.  To set or clear
  303  * these flags, the functions vm_page_aflag_set() and vm_page_aflag_clear()
  304  * must be used.  Neither these flags nor these functions are part of the KBI.
  305  *
  306  * PGA_REFERENCED may be cleared only if the page is locked.  It is set by
  307  * both the MI and MD VM layers.  However, kernel loadable modules should not
  308  * directly set this flag.  They should call vm_page_reference() instead.
  309  *
  310  * PGA_WRITEABLE is set exclusively on managed pages by pmap_enter().
  311  * When it does so, the object must be locked, or the page must be
  312  * exclusive busied.  The MI VM layer must never access this flag
  313  * directly.  Instead, it should call pmap_page_is_write_mapped().
  314  *
  315  * PGA_EXECUTABLE may be set by pmap routines, and indicates that a page has
  316  * at least one executable mapping.  It is not consumed by the MI VM layer.
  317  */
  318 #define PGA_WRITEABLE   0x01            /* page may be mapped writeable */
  319 #define PGA_REFERENCED  0x02            /* page has been referenced */
  320 #define PGA_EXECUTABLE  0x04            /* page may be mapped executable */
  321 
  322 /*
  323  * Page flags.  If changed at any other time than page allocation or
  324  * freeing, the modification must be protected by the vm_page lock.
  325  */
  326 #define PG_CACHED       0x0001          /* page is cached */
  327 #define PG_FREE         0x0002          /* page is free */
  328 #define PG_FICTITIOUS   0x0004          /* physical page doesn't exist */
  329 #define PG_ZERO         0x0008          /* page is zeroed */
  330 #define PG_MARKER       0x0010          /* special queue marker page */
  331 #define PG_WINATCFLS    0x0040          /* flush dirty page on inactive q */
  332 #define PG_NODUMP       0x0080          /* don't include this page in a dump */
  333 #define PG_UNHOLDFREE   0x0100          /* delayed free of a held page */
  334 
  335 /*
  336  * Misc constants.
  337  */
  338 #define ACT_DECLINE             1
  339 #define ACT_ADVANCE             3
  340 #define ACT_INIT                5
  341 #define ACT_MAX                 64
  342 
  343 #ifdef _KERNEL
  344 
  345 #include <sys/systm.h>
  346 
  347 #include <machine/atomic.h>
  348 
  349 /*
  350  * Each pageable resident page falls into one of four lists:
  351  *
  352  *      free
  353  *              Available for allocation now.
  354  *
  355  *      cache
  356  *              Almost available for allocation. Still associated with
  357  *              an object, but clean and immediately freeable.
  358  *
  359  * The following lists are LRU sorted:
  360  *
  361  *      inactive
  362  *              Low activity, candidates for reclamation.
  363  *              This is the list of pages that should be
  364  *              paged out next.
  365  *
  366  *      active
  367  *              Pages that are "active" i.e. they have been
  368  *              recently referenced.
  369  *
  370  */
  371 
  372 extern int vm_page_zero_count;
  373 
  374 extern vm_page_t vm_page_array;         /* First resident page in table */
  375 extern long vm_page_array_size;         /* number of vm_page_t's */
  376 extern long first_page;                 /* first physical page number */
  377 
  378 #define VM_PAGE_IS_FREE(m)      (((m)->flags & PG_FREE) != 0)
  379 
  380 #define VM_PAGE_TO_PHYS(entry)  ((entry)->phys_addr)
  381 
  382 vm_page_t PHYS_TO_VM_PAGE(vm_paddr_t pa);
  383 
  384 /* page allocation classes: */
  385 #define VM_ALLOC_NORMAL         0
  386 #define VM_ALLOC_INTERRUPT      1
  387 #define VM_ALLOC_SYSTEM         2
  388 #define VM_ALLOC_CLASS_MASK     3
  389 /* page allocation flags: */
  390 #define VM_ALLOC_WIRED          0x0020  /* non pageable */
  391 #define VM_ALLOC_ZERO           0x0040  /* Try to obtain a zeroed page */
  392 #define VM_ALLOC_NOOBJ          0x0100  /* No associated object */
  393 #define VM_ALLOC_NOBUSY         0x0200  /* Do not busy the page */
  394 #define VM_ALLOC_IFCACHED       0x0400  /* Fail if the page is not cached */
  395 #define VM_ALLOC_IFNOTCACHED    0x0800  /* Fail if the page is cached */
  396 #define VM_ALLOC_IGN_SBUSY      0x1000  /* vm_page_grab() only */
  397 #define VM_ALLOC_NODUMP         0x2000  /* don't include in dump */
  398 #define VM_ALLOC_SBUSY          0x4000  /* Shared busy the page */
  399 
  400 #define VM_ALLOC_COUNT_SHIFT    16
  401 #define VM_ALLOC_COUNT(count)   ((count) << VM_ALLOC_COUNT_SHIFT)
  402 
  403 #ifdef M_NOWAIT
  404 static inline int
  405 malloc2vm_flags(int malloc_flags)
  406 {
  407         int pflags;
  408 
  409         KASSERT((malloc_flags & M_USE_RESERVE) == 0 ||
  410             (malloc_flags & M_NOWAIT) != 0,
  411             ("M_USE_RESERVE requires M_NOWAIT"));
  412         pflags = (malloc_flags & M_USE_RESERVE) != 0 ? VM_ALLOC_INTERRUPT :
  413             VM_ALLOC_SYSTEM;
  414         if ((malloc_flags & M_ZERO) != 0)
  415                 pflags |= VM_ALLOC_ZERO;
  416         if ((malloc_flags & M_NODUMP) != 0)
  417                 pflags |= VM_ALLOC_NODUMP;
  418         return (pflags);
  419 }
  420 #endif
  421 
  422 void vm_page_busy_downgrade(vm_page_t m);
  423 void vm_page_busy_sleep(vm_page_t m, const char *msg, bool nonshared);
  424 void vm_page_flash(vm_page_t m);
  425 void vm_page_hold(vm_page_t mem);
  426 void vm_page_unhold(vm_page_t mem);
  427 void vm_page_free(vm_page_t m);
  428 void vm_page_free_zero(vm_page_t m);
  429 
  430 void vm_page_activate (vm_page_t);
  431 void vm_page_advise(vm_page_t m, int advice);
  432 vm_page_t vm_page_alloc (vm_object_t, vm_pindex_t, int);
  433 vm_page_t vm_page_alloc_contig(vm_object_t object, vm_pindex_t pindex, int req,
  434     u_long npages, vm_paddr_t low, vm_paddr_t high, u_long alignment,
  435     vm_paddr_t boundary, vm_memattr_t memattr);
  436 vm_page_t vm_page_alloc_freelist(int, int);
  437 vm_page_t vm_page_grab (vm_object_t, vm_pindex_t, int);
  438 void vm_page_cache(vm_page_t);
  439 void vm_page_cache_free(vm_object_t, vm_pindex_t, vm_pindex_t);
  440 void vm_page_cache_transfer(vm_object_t, vm_pindex_t, vm_object_t);
  441 int vm_page_try_to_cache (vm_page_t);
  442 int vm_page_try_to_free (vm_page_t);
  443 void vm_page_deactivate (vm_page_t);
  444 void vm_page_dequeue(vm_page_t m);
  445 void vm_page_dequeue_locked(vm_page_t m);
  446 vm_page_t vm_page_find_least(vm_object_t, vm_pindex_t);
  447 vm_page_t vm_page_getfake(vm_paddr_t paddr, vm_memattr_t memattr);
  448 void vm_page_initfake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr);
  449 int vm_page_insert (vm_page_t, vm_object_t, vm_pindex_t);
  450 boolean_t vm_page_is_cached(vm_object_t object, vm_pindex_t pindex);
  451 vm_page_t vm_page_lookup (vm_object_t, vm_pindex_t);
  452 vm_page_t vm_page_next(vm_page_t m);
  453 int vm_page_pa_tryrelock(pmap_t, vm_paddr_t, vm_paddr_t *);
  454 struct vm_pagequeue *vm_page_pagequeue(vm_page_t m);
  455 vm_page_t vm_page_prev(vm_page_t m);
  456 boolean_t vm_page_ps_is_valid(vm_page_t m);
  457 void vm_page_putfake(vm_page_t m);
  458 void vm_page_readahead_finish(vm_page_t m);
  459 void vm_page_reference(vm_page_t m);
  460 void vm_page_remove (vm_page_t);
  461 int vm_page_rename (vm_page_t, vm_object_t, vm_pindex_t);
  462 vm_page_t vm_page_replace(vm_page_t mnew, vm_object_t object,
  463     vm_pindex_t pindex);
  464 void vm_page_requeue(vm_page_t m);
  465 void vm_page_requeue_locked(vm_page_t m);
  466 int vm_page_sbusied(vm_page_t m);
  467 void vm_page_set_valid_range(vm_page_t m, int base, int size);
  468 int vm_page_sleep_if_busy(vm_page_t m, const char *msg);
  469 vm_offset_t vm_page_startup(vm_offset_t vaddr);
  470 void vm_page_sunbusy(vm_page_t m);
  471 int vm_page_trysbusy(vm_page_t m);
  472 void vm_page_unhold_pages(vm_page_t *ma, int count);
  473 void vm_page_unwire (vm_page_t, int);
  474 void vm_page_updatefake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr);
  475 void vm_page_wire (vm_page_t);
  476 void vm_page_xunbusy_hard(vm_page_t m);
  477 void vm_page_set_validclean (vm_page_t, int, int);
  478 void vm_page_clear_dirty (vm_page_t, int, int);
  479 void vm_page_set_invalid (vm_page_t, int, int);
  480 int vm_page_is_valid (vm_page_t, int, int);
  481 void vm_page_test_dirty (vm_page_t);
  482 vm_page_bits_t vm_page_bits(int base, int size);
  483 void vm_page_zero_invalid(vm_page_t m, boolean_t setvalid);
  484 void vm_page_free_toq(vm_page_t m);
  485 void vm_page_zero_idle_wakeup(void);
  486 
  487 void vm_page_dirty_KBI(vm_page_t m);
  488 void vm_page_lock_KBI(vm_page_t m, const char *file, int line);
  489 void vm_page_unlock_KBI(vm_page_t m, const char *file, int line);
  490 int vm_page_trylock_KBI(vm_page_t m, const char *file, int line);
  491 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
  492 void vm_page_assert_locked_KBI(vm_page_t m, const char *file, int line);
  493 void vm_page_lock_assert_KBI(vm_page_t m, int a, const char *file, int line);
  494 #endif
  495 
  496 #define vm_page_assert_sbusied(m)                                       \
  497         KASSERT(vm_page_sbusied(m),                                     \
  498             ("vm_page_assert_sbusied: page %p not shared busy @ %s:%d", \
  499             (void *)m, __FILE__, __LINE__));
  500 
  501 #define vm_page_assert_unbusied(m)                                      \
  502         KASSERT(!vm_page_busied(m),                                     \
  503             ("vm_page_assert_unbusied: page %p busy @ %s:%d",           \
  504             (void *)m, __FILE__, __LINE__));
  505 
  506 #define vm_page_assert_xbusied(m)                                       \
  507         KASSERT(vm_page_xbusied(m),                                     \
  508             ("vm_page_assert_xbusied: page %p not exclusive busy @ %s:%d", \
  509             (void *)m, __FILE__, __LINE__));
  510 
  511 #define vm_page_busied(m)                                               \
  512         ((m)->busy_lock != VPB_UNBUSIED)
  513 
  514 #define vm_page_sbusy(m) do {                                           \
  515         if (!vm_page_trysbusy(m))                                       \
  516                 panic("%s: page %p failed shared busing", __func__, m); \
  517 } while (0)
  518 
  519 #define vm_page_tryxbusy(m)                                             \
  520         (atomic_cmpset_acq_int(&m->busy_lock, VPB_UNBUSIED,             \
  521             VPB_SINGLE_EXCLUSIVER))
  522 
  523 #define vm_page_xbusied(m)                                              \
  524         ((m->busy_lock & VPB_SINGLE_EXCLUSIVER) != 0)
  525 
  526 #define vm_page_xbusy(m) do {                                           \
  527         if (!vm_page_tryxbusy(m))                                       \
  528                 panic("%s: page %p failed exclusive busing", __func__,  \
  529                     m);                                                 \
  530 } while (0)
  531 
  532 #define vm_page_xunbusy(m) do {                                         \
  533         if (!atomic_cmpset_rel_int(&(m)->busy_lock,                     \
  534             VPB_SINGLE_EXCLUSIVER, VPB_UNBUSIED))                       \
  535                 vm_page_xunbusy_hard(m);                                \
  536 } while (0)
  537 
  538 #ifdef INVARIANTS
  539 void vm_page_object_lock_assert(vm_page_t m);
  540 #define VM_PAGE_OBJECT_LOCK_ASSERT(m)   vm_page_object_lock_assert(m)
  541 void vm_page_assert_pga_writeable(vm_page_t m, uint8_t bits);
  542 #define VM_PAGE_ASSERT_PGA_WRITEABLE(m, bits)                           \
  543         vm_page_assert_pga_writeable(m, bits)
  544 #else
  545 #define VM_PAGE_OBJECT_LOCK_ASSERT(m)   (void)0
  546 #define VM_PAGE_ASSERT_PGA_WRITEABLE(m, bits)   (void)0
  547 #endif
  548 
  549 /*
  550  * We want to use atomic updates for the aflags field, which is 8 bits wide.
  551  * However, not all architectures support atomic operations on 8-bit
  552  * destinations.  In order that we can easily use a 32-bit operation, we
  553  * require that the aflags field be 32-bit aligned.
  554  */
  555 CTASSERT(offsetof(struct vm_page, aflags) % sizeof(uint32_t) == 0);
  556 
  557 /*
  558  *      Clear the given bits in the specified page.
  559  */
  560 static inline void
  561 vm_page_aflag_clear(vm_page_t m, uint8_t bits)
  562 {
  563         uint32_t *addr, val;
  564 
  565         /*
  566          * The PGA_REFERENCED flag can only be cleared if the page is locked.
  567          */
  568         if ((bits & PGA_REFERENCED) != 0)
  569                 vm_page_assert_locked(m);
  570 
  571         /*
  572          * Access the whole 32-bit word containing the aflags field with an
  573          * atomic update.  Parallel non-atomic updates to the other fields
  574          * within this word are handled properly by the atomic update.
  575          */
  576         addr = (void *)&m->aflags;
  577         KASSERT(((uintptr_t)addr & (sizeof(uint32_t) - 1)) == 0,
  578             ("vm_page_aflag_clear: aflags is misaligned"));
  579         val = bits;
  580 #if BYTE_ORDER == BIG_ENDIAN
  581         val <<= 24;
  582 #endif
  583         atomic_clear_32(addr, val);
  584 }
  585 
  586 /*
  587  *      Set the given bits in the specified page.
  588  */
  589 static inline void
  590 vm_page_aflag_set(vm_page_t m, uint8_t bits)
  591 {
  592         uint32_t *addr, val;
  593 
  594         VM_PAGE_ASSERT_PGA_WRITEABLE(m, bits);
  595 
  596         /*
  597          * Access the whole 32-bit word containing the aflags field with an
  598          * atomic update.  Parallel non-atomic updates to the other fields
  599          * within this word are handled properly by the atomic update.
  600          */
  601         addr = (void *)&m->aflags;
  602         KASSERT(((uintptr_t)addr & (sizeof(uint32_t) - 1)) == 0,
  603             ("vm_page_aflag_set: aflags is misaligned"));
  604         val = bits;
  605 #if BYTE_ORDER == BIG_ENDIAN
  606         val <<= 24;
  607 #endif
  608         atomic_set_32(addr, val);
  609 } 
  610 
  611 /*
  612  *      vm_page_dirty:
  613  *
  614  *      Set all bits in the page's dirty field.
  615  *
  616  *      The object containing the specified page must be locked if the
  617  *      call is made from the machine-independent layer.
  618  *
  619  *      See vm_page_clear_dirty_mask().
  620  */
  621 static __inline void
  622 vm_page_dirty(vm_page_t m)
  623 {
  624 
  625         /* Use vm_page_dirty_KBI() under INVARIANTS to save memory. */
  626 #if defined(KLD_MODULE) || defined(INVARIANTS)
  627         vm_page_dirty_KBI(m);
  628 #else
  629         m->dirty = VM_PAGE_BITS_ALL;
  630 #endif
  631 }
  632 
  633 /*
  634  *      vm_page_remque:
  635  *
  636  *      If the given page is in a page queue, then remove it from that page
  637  *      queue.
  638  *
  639  *      The page must be locked.
  640  */
  641 static inline void
  642 vm_page_remque(vm_page_t m)
  643 {
  644 
  645         if (m->queue != PQ_NONE)
  646                 vm_page_dequeue(m);
  647 }
  648 
  649 /*
  650  *      vm_page_undirty:
  651  *
  652  *      Set page to not be dirty.  Note: does not clear pmap modify bits
  653  */
  654 static __inline void
  655 vm_page_undirty(vm_page_t m)
  656 {
  657 
  658         VM_PAGE_OBJECT_LOCK_ASSERT(m);
  659         m->dirty = 0;
  660 }
  661 
  662 #endif                          /* _KERNEL */
  663 #endif                          /* !_VM_PAGE_ */

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