sys/vm/vm_map.h

   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  * 3. 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  *      @(#)vm_map.h    8.9 (Berkeley) 5/17/95
  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: src/sys/vm/vm_map.h,v 1.54.2.5 2003/01/13 22:51:17 dillon Exp $
  61  */
  62
  63 /*
  64  *      Virtual memory map module definitions.
  65  */
  66
  67 #ifndef _VM_VM_MAP_H_
  68 #define _VM_VM_MAP_H_
  69
  70 #ifndef _SYS_TYPES_H_
  71 #include <sys/types.h>
  72 #endif
  73 #ifdef _KERNEL
  74 #ifndef _SYS_KERNEL_H_
  75 #include <sys/kernel.h> /* ticks */
  76 #endif
  77 #endif
  78 #ifndef _SYS_TREE_H_
  79 #include <sys/tree.h>
  80 #endif
  81 #ifndef _SYS_SYSREF_H_
  82 #include <sys/sysref.h>
  83 #endif
  84 #ifndef _SYS_LOCK_H_
  85 #include <sys/lock.h>
  86 #endif
  87 #ifndef _SYS_VKERNEL_H_
  88 #include <sys/vkernel.h>
  89 #endif
  90 #ifndef _VM_VM_H_
  91 #include <vm/vm.h>
  92 #endif
  93 #ifndef _MACHINE_PMAP_H_
  94 #include <machine/pmap.h>
  95 #endif
  96 #ifndef _VM_VM_OBJECT_H_
  97 #include <vm/vm_object.h>
  98 #endif
  99 #ifndef _SYS_NULL_H_
 100 #include <sys/_null.h>
 101 #endif
 102
 103 struct vm_map_rb_tree;
 104 RB_PROTOTYPE(vm_map_rb_tree, vm_map_entry, rb_entry, rb_vm_map_compare);
 105
 106 /*
 107  *      Types defined:
 108  *
 109  *      vm_map_t                the high-level address map data structure.
 110  *      vm_map_entry_t          an entry in an address map.
 111  */
 112
 113 typedef u_int vm_flags_t;
 114 typedef u_int vm_eflags_t;
 115
 116 /*
 117  * A vm_map_entry may reference an object, a submap, a uksmap, or a
 118  * direct user-kernel shared map.
 119  */
 120 union vm_map_object {
 121         struct vm_object *vm_object;    /* object object */
 122         struct vm_map *sub_map;         /* belongs to another map */
 123         int     (*uksmap)(struct cdev *dev, vm_page_t fake);
 124         void    *map_object;            /* generic */
 125 };
 126
 127 union vm_map_aux {
 128         vm_offset_t avail_ssize;        /* amt can grow if this is a stack */
 129         vpte_t master_pde;              /* virtual page table root */
 130         struct cdev *dev;
 131         void    *map_aux;
 132 };
 133
 134 /*
 135  * vm_map_entry identifiers, used as a debugging aid
 136  */
 137 typedef enum {
 138         VM_SUBSYS_UNKNOWN,
 139         VM_SUBSYS_KMALLOC,
 140         VM_SUBSYS_STACK,
 141         VM_SUBSYS_IMGACT,
 142         VM_SUBSYS_EFI,
 143         VM_SUBSYS_RESERVED,
 144         VM_SUBSYS_INIT,
 145         VM_SUBSYS_PIPE,
 146         VM_SUBSYS_PROC,
 147         VM_SUBSYS_SHMEM,
 148         VM_SUBSYS_SYSMAP,
 149         VM_SUBSYS_MMAP,
 150         VM_SUBSYS_BRK,
 151         VM_SUBSYS_BOGUS,
 152         VM_SUBSYS_BUF,
 153         VM_SUBSYS_BUFDATA,
 154         VM_SUBSYS_GD,
 155         VM_SUBSYS_IPIQ,
 156         VM_SUBSYS_PVENTRY,
 157         VM_SUBSYS_PML4,
 158         VM_SUBSYS_MAPDEV,
 159         VM_SUBSYS_ZALLOC,
 160
 161         VM_SUBSYS_DM,
 162         VM_SUBSYS_CONTIG,
 163         VM_SUBSYS_DRM,
 164         VM_SUBSYS_DRM_GEM,
 165         VM_SUBSYS_DRM_SCAT,
 166         VM_SUBSYS_DRM_VMAP,
 167         VM_SUBSYS_DRM_TTM,
 168         VM_SUBSYS_HAMMER,
 169
 170         VM_SUBSYS_LIMIT         /* end of list */
 171 } vm_subsys_t;
 172
 173 /*
 174  *      Address map entries consist of start and end addresses,
 175  *      a VM object (or sharing map) and offset into that object,
 176  *      and user-exported inheritance and protection information.
 177  *      Also included is control information for virtual copy operations.
 178  *
 179  *      When used with MAP_STACK, avail_ssize is used to determine the
 180  *      limits of stack growth.
 181  *
 182  *      When used with VM_MAPTYPE_VPAGETABLE, avail_ssize stores the
 183  *      page directory index.
 184  */
 185 struct vm_map_entry {
 186         struct vm_map_entry *prev;      /* previous entry */
 187         struct vm_map_entry *next;      /* next entry */
 188         RB_ENTRY(vm_map_entry) rb_entry;
 189         vm_offset_t start;              /* start address */
 190         vm_offset_t end;                /* end address */
 191         union vm_map_aux aux;           /* auxillary data */
 192         union vm_map_object object;     /* object I point to */
 193         vm_ooffset_t offset;            /* offset into object */
 194         vm_eflags_t eflags;             /* map entry flags */
 195         vm_maptype_t maptype;           /* type of VM mapping */
 196         vm_prot_t protection;           /* protection code */
 197         vm_prot_t max_protection;       /* maximum protection */
 198         vm_inherit_t inheritance;       /* inheritance */
 199         int wired_count;                /* can be paged if = 0 */
 200         vm_subsys_t id;                 /* subsystem id */
 201 };
 202
 203 #define MAP_ENTRY_NOSYNC                0x0001
 204 #define MAP_ENTRY_STACK                 0x0002
 205 #define MAP_ENTRY_COW                   0x0004
 206 #define MAP_ENTRY_NEEDS_COPY            0x0008
 207 #define MAP_ENTRY_NOFAULT               0x0010
 208 #define MAP_ENTRY_USER_WIRED            0x0020
 209
 210 #define MAP_ENTRY_BEHAV_NORMAL          0x0000  /* default behavior */
 211 #define MAP_ENTRY_BEHAV_SEQUENTIAL      0x0040  /* expect sequential access */
 212 #define MAP_ENTRY_BEHAV_RANDOM          0x0080  /* expect random access */
 213 #define MAP_ENTRY_BEHAV_RESERVED        0x00C0  /* future use */
 214
 215 #define MAP_ENTRY_BEHAV_MASK            0x00C0
 216
 217 #define MAP_ENTRY_IN_TRANSITION         0x0100  /* entry being changed */
 218 #define MAP_ENTRY_NEEDS_WAKEUP          0x0200  /* waiter's in transition */
 219 #define MAP_ENTRY_NOCOREDUMP            0x0400  /* don't include in a core */
 220 #define MAP_ENTRY_KSTACK                0x0800  /* guarded kernel stack */
 221
 222 /*
 223  * flags for vm_map_[un]clip_range()
 224  */
 225 #define MAP_CLIP_NO_HOLES               0x0001
 226
 227 /*
 228  * This reserve count for vm_map_entry_reserve() should cover all nominal
 229  * single-insertion operations, including any necessary clipping.
 230  */
 231 #define MAP_RESERVE_COUNT       4
 232 #define MAP_RESERVE_SLOP        32
 233
 234 static __inline u_char
 235 vm_map_entry_behavior(struct vm_map_entry *entry)
 236 {
 237         return entry->eflags & MAP_ENTRY_BEHAV_MASK;
 238 }
 239
 240 static __inline void
 241 vm_map_entry_set_behavior(struct vm_map_entry *entry, u_char behavior)
 242 {
 243         entry->eflags = (entry->eflags & ~MAP_ENTRY_BEHAV_MASK) |
 244                 (behavior & MAP_ENTRY_BEHAV_MASK);
 245 }
 246
 247 /*
 248  * VA interlock for map (VPAGETABLE / vkernel support)
 249  */
 250 struct vm_map_ilock {
 251         struct vm_map_ilock *next;
 252         int     flags;
 253         vm_offset_t ran_beg;
 254         vm_offset_t ran_end;    /* non-inclusive */
 255 };
 256
 257 #define ILOCK_WAITING   0x00000001
 258
 259 /*
 260  * Hinting mechanism used by vm_map_findspace() to figure out where to start
 261  * an iteration looking for a hole big enough for the requested allocation.
 262  * This can be important in situations where large amounts of kernel memory
 263  * are being managed.  For example, if the system is managing tens of
 264  * thousands of processes or threads.
 265  *
 266  * If a hint is present it guarantees that no compatible hole exists prior
 267  * to the (start) address.  The (start) address itself is not necessarily
 268  * a hole.
 269  */
 270 #define VM_MAP_FFCOUNT  4
 271 #define VM_MAP_FFMASK   (VM_MAP_FFCOUNT - 1)
 272
 273 struct vm_map_freehint {
 274         vm_offset_t     start;
 275         vm_offset_t     length;
 276         vm_offset_t     align;
 277         int             unused01;
 278 };
 279 typedef struct vm_map_freehint vm_map_freehint_t;
 280
 281 /*
 282  * Maps are doubly-linked lists of map entries, kept sorted by address.
 283  * A single hint is provided to start searches again from the last
 284  * successful search, insertion, or removal.
 285  *
 286  * NOTE: The lock structure cannot be the first element of vm_map
 287  *       because this can result in a running lockup between two or more
 288  *       system processes trying to kmem_alloc_wait() due to kmem_alloc_wait()
 289  *       and free tsleep/waking up 'map' and the underlying lockmgr also
 290  *       sleeping and waking up on 'map'.  The lockup occurs when the map fills
 291  *       up.  The 'exec' map, for example.
 292  *
 293  * NOTE: The vm_map structure can be hard-locked with the lockmgr lock
 294  *       or soft-serialized with the token, or both.
 295  */
 296 struct vm_map {
 297         struct vm_map_entry header;     /* List of entries */
 298         RB_HEAD(vm_map_rb_tree, vm_map_entry) rb_root;
 299         struct lock lock;               /* Lock for map data */
 300         int nentries;                   /* Number of entries */
 301         unsigned int timestamp;         /* Version number */
 302         vm_size_t size;                 /* virtual size */
 303         u_char system_map;              /* Am I a system map? */
 304         u_char freehint_newindex;
 305         u_char unused02;
 306         u_char unused03;
 307         vm_flags_t flags;               /* flags for this vm_map */
 308         vm_map_freehint_t freehint[VM_MAP_FFCOUNT];
 309         struct pmap *pmap;              /* Physical map */
 310         u_int president_cache;          /* Remember president count */
 311         u_int president_ticks;          /* Save ticks for cache */
 312         struct vm_map_ilock *ilock_base;/* interlocks */
 313         struct spinlock ilock_spin;     /* interlocks (spinlock for) */
 314         struct lwkt_token token;        /* Soft serializer */
 315         vm_offset_t pgout_offset;       /* for RLIMIT_RSS scans */
 316 #define min_offset              header.start
 317 #define max_offset              header.end
 318 };
 319
 320 /*
 321  * vm_flags_t values
 322  */
 323 #define MAP_WIREFUTURE          0x0001  /* wire all future pages */
 324
 325 /*
 326  * Shareable process virtual address space.
 327  *
 328  * Refd pointers from vmresident, proc
 329  */
 330 struct vmspace {
 331         struct vm_map vm_map;   /* VM address map */
 332         struct pmap vm_pmap;    /* private physical map */
 333         int vm_flags;
 334         caddr_t vm_shm;         /* SYS5 shared memory private data XXX */
 335 /* we copy from vm_startcopy to the end of the structure on fork */
 336 #define vm_startcopy vm_rssize
 337         segsz_t vm_rssize;      /* current resident set size in pages */
 338         segsz_t vm_swrss;       /* resident set size before last swap */
 339         segsz_t vm_tsize;       /* text size (pages) XXX */
 340         segsz_t vm_dsize;       /* data size (pages) XXX */
 341         segsz_t vm_ssize;       /* stack size (pages) */
 342         caddr_t vm_taddr;       /* user virtual address of text XXX */
 343         caddr_t vm_daddr;       /* user virtual address of data XXX */
 344         caddr_t vm_maxsaddr;    /* user VA at max stack growth */
 345         caddr_t vm_minsaddr;    /* user VA at max stack growth */
 346 #define vm_endcopy      vm_unused01
 347         int     vm_unused01;
 348         int     vm_unused02;
 349         int     vm_pagesupply;
 350         u_int   vm_holdcnt;     /* temporary hold count and exit sequencing */
 351         u_int   vm_refcnt;      /* normal ref count */
 352 };
 353
 354 #define VM_REF_DELETED          0x80000000U
 355
 356 #define VMSPACE_EXIT1           0x0001  /* partial exit */
 357 #define VMSPACE_EXIT2           0x0002  /* full exit */
 358
 359 #define VMSPACE_HOLDEXIT        0x80000000
 360
 361 /*
 362  * Resident executable holding structure.  A user program can take a snapshot
 363  * of just its VM address space (typically done just after dynamic link
 364  * libraries have completed loading) and register it as a resident
 365  * executable associated with the program binary's vnode, which is also
 366  * locked into memory.  Future execs of the vnode will start with a copy
 367  * of the resident vmspace instead of running the binary from scratch,
 368  * avoiding both the kernel ELF loader *AND* all shared library mapping and
 369  * relocation code, and will call a different entry point (the stack pointer
 370  * is reset to the top of the stack) supplied when the vmspace was registered.
 371  */
 372 struct vmresident {
 373         struct vnode    *vr_vnode;              /* associated vnode */
 374         TAILQ_ENTRY(vmresident) vr_link;        /* linked list of res sts */
 375         struct vmspace  *vr_vmspace;            /* vmspace to fork */
 376         intptr_t        vr_entry_addr;          /* registered entry point */
 377         struct sysentvec *vr_sysent;            /* system call vects */
 378         int             vr_id;                  /* registration id */
 379         int             vr_refs;                /* temporary refs */
 380 };
 381
 382 #ifdef _KERNEL
 383 /*
 384  *      Macros:         vm_map_lock, etc.
 385  *      Function:
 386  *              Perform locking on the data portion of a map.  Note that
 387  *              these macros mimic procedure calls returning void.  The
 388  *              semicolon is supplied by the user of these macros, not
 389  *              by the macros themselves.  The macros can safely be used
 390  *              as unbraced elements in a higher level statement.
 391  */
 392
 393 #define ASSERT_VM_MAP_LOCKED(map)       KKASSERT(lockowned(&(map)->lock))
 394
 395 #ifdef DIAGNOSTIC
 396 /* #define MAP_LOCK_DIAGNOSTIC 1 */
 397 #ifdef MAP_LOCK_DIAGNOSTIC
 398 #define vm_map_lock(map) \
 399         do { \
 400                 kprintf ("locking map LK_EXCLUSIVE: 0x%x\n", map); \
 401                 if (lockmgr(&(map)->lock, LK_EXCLUSIVE) != 0) { \
 402                         panic("vm_map_lock: failed to get lock"); \
 403                 } \
 404                 (map)->timestamp++; \
 405         } while(0)
 406 #else
 407 #define vm_map_lock(map) \
 408         do { \
 409                 if (lockmgr(&(map)->lock, LK_EXCLUSIVE) != 0) { \
 410                         panic("vm_map_lock: failed to get lock"); \
 411                 } \
 412                 (map)->timestamp++; \
 413         } while(0)
 414 #endif
 415 #else
 416 #define vm_map_lock(map) \
 417         do { \
 418                 lockmgr(&(map)->lock, LK_EXCLUSIVE); \
 419                 (map)->timestamp++; \
 420         } while(0)
 421 #endif /* DIAGNOSTIC */
 422
 423 #if defined(MAP_LOCK_DIAGNOSTIC)
 424 #define vm_map_unlock(map) \
 425         do { \
 426                 kprintf ("locking map LK_RELEASE: 0x%x\n", map); \
 427                 lockmgr(&(map)->lock, LK_RELEASE); \
 428         } while (0)
 429 #define vm_map_lock_read(map) \
 430         do { \
 431                 kprintf ("locking map LK_SHARED: 0x%x\n", map); \
 432                 lockmgr(&(map)->lock, LK_SHARED); \
 433         } while (0)
 434 #define vm_map_unlock_read(map) \
 435         do { \
 436                 kprintf ("locking map LK_RELEASE: 0x%x\n", map); \
 437                 lockmgr(&(map)->lock, LK_RELEASE); \
 438         } while (0)
 439 #else
 440 #define vm_map_unlock(map) \
 441         lockmgr(&(map)->lock, LK_RELEASE)
 442 #define vm_map_lock_read(map) \
 443         lockmgr(&(map)->lock, LK_SHARED)
 444 #define vm_map_unlock_read(map) \
 445         lockmgr(&(map)->lock, LK_RELEASE)
 446 #endif
 447
 448 #define vm_map_lock_read_try(map) \
 449         lockmgr(&(map)->lock, LK_SHARED | LK_NOWAIT)
 450
 451 static __inline__ int
 452 vm_map_lock_read_to(vm_map_t map)
 453 {
 454         int error;
 455
 456 #if defined(MAP_LOCK_DIAGNOSTIC)
 457         kprintf ("locking map LK_SHARED: 0x%x\n", map);
 458 #endif
 459         error = lockmgr(&(map)->lock, LK_SHARED | LK_TIMELOCK);
 460         return error;
 461 }
 462
 463 static __inline__ int
 464 vm_map_lock_upgrade(vm_map_t map) {
 465         int error;
 466 #if defined(MAP_LOCK_DIAGNOSTIC)
 467         kprintf("locking map LK_EXCLUPGRADE: 0x%x\n", map);
 468 #endif
 469         error = lockmgr(&map->lock, LK_EXCLUPGRADE);
 470         if (error == 0)
 471                 map->timestamp++;
 472         return error;
 473 }
 474
 475 #if defined(MAP_LOCK_DIAGNOSTIC)
 476 #define vm_map_lock_downgrade(map) \
 477         do { \
 478                 kprintf ("locking map LK_DOWNGRADE: 0x%x\n", map); \
 479                 lockmgr(&(map)->lock, LK_DOWNGRADE); \
 480         } while (0)
 481 #else
 482 #define vm_map_lock_downgrade(map) \
 483         lockmgr(&(map)->lock, LK_DOWNGRADE)
 484 #endif
 485
 486 #endif /* _KERNEL */
 487
 488 /*
 489  *      Functions implemented as macros
 490  */
 491 #define         vm_map_min(map)         ((map)->min_offset)
 492 #define         vm_map_max(map)         ((map)->max_offset)
 493 #define         vm_map_pmap(map)        ((map)->pmap)
 494
 495 /*
 496  * Must not block
 497  */
 498 static __inline struct pmap *
 499 vmspace_pmap(struct vmspace *vmspace)
 500 {
 501         return &vmspace->vm_pmap;
 502 }
 503
 504 /*
 505  * Caller must hold the vmspace->vm_map.token
 506  */
 507 static __inline long
 508 vmspace_resident_count(struct vmspace *vmspace)
 509 {
 510         return pmap_resident_count(vmspace_pmap(vmspace));
 511 }
 512
 513 /*
 514  * Calculates the proportional RSS and returning the
 515  * accrued result.  This is a loose value for statistics/display
 516  * purposes only and will only be updated if we can acquire
 517  * a non-blocking map lock.
 518  *
 519  * (used by userland or the kernel)
 520  */
 521 static __inline u_int
 522 vmspace_president_count(struct vmspace *vmspace)
 523 {
 524         vm_map_t map = &vmspace->vm_map;
 525         vm_map_entry_t cur;
 526         vm_object_t object;
 527         u_int count = 0;
 528
 529 #ifdef _KERNEL
 530         if (map->president_ticks == ticks / hz || vm_map_lock_read_try(map))
 531                 return(map->president_cache);
 532 #endif
 533
 534         for (cur = map->header.next; cur != &map->header; cur = cur->next) {
 535                 switch(cur->maptype) {
 536                 case VM_MAPTYPE_NORMAL:
 537                 case VM_MAPTYPE_VPAGETABLE:
 538                         if ((object = cur->object.vm_object) == NULL)
 539                                 break;
 540                         if (object->type != OBJT_DEFAULT &&
 541                             object->type != OBJT_SWAP) {
 542                                 break;
 543                         }
 544
 545 #if 0
 546                         /*
 547                          * synchronize non-zero case, contents of field
 548                          * can change at any time due to pmap ops.
 549                          */
 550                         if ((n = object->agg_pv_list_count) != 0) {
 551 #ifdef _KERNEL
 552                                 cpu_ccfence();
 553 #endif
 554                                 count += object->resident_page_count / n;
 555                         }
 556 #endif
 557                         break;
 558                 default:
 559                         break;
 560                 }
 561         }
 562 #ifdef _KERNEL
 563         map->president_cache = count;
 564         map->president_ticks = ticks / hz;
 565         vm_map_unlock_read(map);
 566 #endif
 567
 568         return(count);
 569 }
 570
 571 /*
 572  * Number of kernel maps and entries to statically allocate, required
 573  * during boot to bootstrap the VM system.
 574  */
 575 #define MAX_KMAP        10
 576 #define MAX_MAPENT      (SMP_MAXCPU * 32 + 1024)
 577
 578 /*
 579  * Copy-on-write flags for vm_map operations
 580  */
 581 #define MAP_UNUSED_01           0x0001
 582 #define MAP_COPY_ON_WRITE       0x0002
 583 #define MAP_NOFAULT             0x0004
 584 #define MAP_PREFAULT            0x0008
 585 #define MAP_PREFAULT_PARTIAL    0x0010
 586 #define MAP_DISABLE_SYNCER      0x0020
 587 #define MAP_IS_STACK            0x0040
 588 #define MAP_IS_KSTACK           0x0080
 589 #define MAP_DISABLE_COREDUMP    0x0100
 590 #define MAP_PREFAULT_MADVISE    0x0200  /* from (user) madvise request */
 591 #define MAP_PREFAULT_RELOCK     0x0200
 592
 593 /*
 594  * vm_fault option flags
 595  */
 596 #define VM_FAULT_NORMAL         0x00    /* Nothing special */
 597 #define VM_FAULT_CHANGE_WIRING  0x01    /* Change the wiring as appropriate */
 598 #define VM_FAULT_USER_WIRE      0x02    /* Likewise, but for user purposes */
 599 #define VM_FAULT_BURST          0x04    /* Burst fault can be done */
 600 #define VM_FAULT_DIRTY          0x08    /* Dirty the page */
 601 #define VM_FAULT_UNSWAP         0x10    /* Remove backing store from the page */
 602 #define VM_FAULT_BURST_QUICK    0x20    /* Special case shared vm_object */
 603 #define VM_FAULT_WIRE_MASK      (VM_FAULT_CHANGE_WIRING|VM_FAULT_USER_WIRE)
 604 #define VM_FAULT_USERMODE       0x40
 605
 606 #ifdef _KERNEL
 607
 608 boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t,
 609                 vm_prot_t, boolean_t);
 610 struct pmap;
 611 struct globaldata;
 612 void vm_map_entry_allocate_object(vm_map_entry_t);
 613 void vm_map_entry_reserve_cpu_init(struct globaldata *gd);
 614 int vm_map_entry_reserve(int);
 615 int vm_map_entry_kreserve(int);
 616 void vm_map_entry_release(int);
 617 void vm_map_entry_krelease(int);
 618 int vm_map_delete (vm_map_t, vm_offset_t, vm_offset_t, int *);
 619 int vm_map_find (vm_map_t, void *, void *,
 620                  vm_ooffset_t, vm_offset_t *, vm_size_t,
 621                  vm_size_t, boolean_t,
 622                  vm_maptype_t, vm_subsys_t id,
 623                  vm_prot_t, vm_prot_t, int);
 624 int vm_map_findspace (vm_map_t, vm_offset_t, vm_size_t, vm_size_t,
 625                       int, vm_offset_t *);
 626 vm_offset_t vm_map_hint(struct proc *, vm_offset_t, vm_prot_t);
 627 int vm_map_inherit (vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t);
 628 void vm_map_init (struct vm_map *, vm_offset_t, vm_offset_t, pmap_t);
 629 int vm_map_insert (vm_map_t, int *, void *, void *,
 630                    vm_ooffset_t, vm_offset_t, vm_offset_t,
 631                    vm_maptype_t, vm_subsys_t id,
 632                    vm_prot_t, vm_prot_t, int);
 633 int vm_map_lookup (vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
 634     vm_pindex_t *, vm_prot_t *, boolean_t *);
 635 void vm_map_lookup_done (vm_map_t, vm_map_entry_t, int);
 636 boolean_t vm_map_lookup_entry (vm_map_t, vm_offset_t, vm_map_entry_t *);
 637 int vm_map_wire (vm_map_t, vm_offset_t, vm_offset_t, int);
 638 int vm_map_unwire (vm_map_t, vm_offset_t, vm_offset_t, boolean_t);
 639 int vm_map_clean (vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t);
 640 int vm_map_protect (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t);
 641 int vm_map_remove (vm_map_t, vm_offset_t, vm_offset_t);
 642 void vm_map_startup (void);
 643 int vm_map_submap (vm_map_t, vm_offset_t, vm_offset_t, vm_map_t);
 644 int vm_map_madvise (vm_map_t, vm_offset_t, vm_offset_t, int, off_t);
 645 void vm_map_simplify_entry (vm_map_t, vm_map_entry_t, int *);
 646 void vm_init2 (void);
 647 int vm_uiomove (vm_map_t, vm_object_t, off_t, int, vm_offset_t, int *);
 648 int vm_map_stack (vm_map_t, vm_offset_t, vm_size_t, int,
 649                   vm_prot_t, vm_prot_t, int);
 650 int vm_map_growstack (vm_map_t map, vm_offset_t addr);
 651 vm_offset_t vmspace_swap_count (struct vmspace *vmspace);
 652 vm_offset_t vmspace_anonymous_count (struct vmspace *vmspace);
 653 void vm_map_set_wired_quick(vm_map_t map, vm_offset_t addr, vm_size_t size, int *);
 654 void vm_map_transition_wait(vm_map_t map);
 655
 656 void vm_map_interlock(vm_map_t map, struct vm_map_ilock *ilock,
 657                         vm_offset_t ran_beg, vm_offset_t ran_end);
 658 void vm_map_deinterlock(vm_map_t map, struct vm_map_ilock *ilock);
 659
 660
 661 #if defined(__x86_64__) && defined(_KERNEL_VIRTUAL)
 662 int vkernel_module_memory_alloc(vm_offset_t *, size_t);
 663 void vkernel_module_memory_free(vm_offset_t, size_t);
 664 #endif
 665
 666 #endif
 667 #endif                          /* _VM_VM_MAP_H_ */