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. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)vm_map.h    8.9 (Berkeley) 5/17/95
  37  *
  38  *
  39  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
  40  * All rights reserved.
  41  *
  42  * Authors: Avadis Tevanian, Jr., Michael Wayne Young
  43  *
  44  * Permission to use, copy, modify and distribute this software and
  45  * its documentation is hereby granted, provided that both the copyright
  46  * notice and this permission notice appear in all copies of the
  47  * software, derivative works or modified versions, and any portions
  48  * thereof, and that both notices appear in supporting documentation.
  49  *
  50  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  51  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
  52  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  53  *
  54  * Carnegie Mellon requests users of this software to return to
  55  *
  56  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  57  *  School of Computer Science
  58  *  Carnegie Mellon University
  59  *  Pittsburgh PA 15213-3890
  60  *
  61  * any improvements or extensions that they make and grant Carnegie the
  62  * rights to redistribute these changes.
  63  *
  64  * $FreeBSD: src/sys/vm/vm_map.h,v 1.54.2.5 2003/01/13 22:51:17 dillon Exp $
  65  * $DragonFly: src/sys/vm/vm_map.h,v 1.30 2007/04/29 18:25:41 dillon Exp $
  66  */
  67
  68 /*
  69  *      Virtual memory map module definitions.
  70  */
  71
  72 #ifndef _VM_VM_MAP_H_
  73 #define _VM_VM_MAP_H_
  74
  75 #ifndef _SYS_TYPES_H_
  76 #include <sys/types.h>
  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
  97 struct vm_map_rb_tree;
  98 RB_PROTOTYPE(vm_map_rb_tree, vm_map_entry, rb_entry, rb_vm_map_compare);
  99
 100 /*
 101  *      Types defined:
 102  *
 103  *      vm_map_t                the high-level address map data structure.
 104  *      vm_map_entry_t          an entry in an address map.
 105  */
 106
 107 typedef u_int vm_eflags_t;
 108
 109 /*
 110  *      Objects which live in maps may be either VM objects, or
 111  *      another map (called a "sharing map") which denotes read-write
 112  *      sharing with other maps.
 113  */
 114 union vm_map_object {
 115         struct vm_object *vm_object;    /* object object */
 116         struct vm_map *sub_map;         /* belongs to another map */
 117 };
 118
 119 union vm_map_aux {
 120         vm_offset_t avail_ssize;        /* amt can grow if this is a stack */
 121         vpte_t master_pde;              /* virtual page table root */
 122 };
 123
 124 /*
 125  *      Address map entries consist of start and end addresses,
 126  *      a VM object (or sharing map) and offset into that object,
 127  *      and user-exported inheritance and protection information.
 128  *      Also included is control information for virtual copy operations.
 129  *
 130  *      When used with MAP_STACK, avail_ssize is used to determine the
 131  *      limits of stack growth.
 132  *
 133  *      When used with VM_MAPTYPE_VPAGETABLE, avail_ssize stores the
 134  *      page directory index.
 135  */
 136 struct vm_map_entry {
 137         struct vm_map_entry *prev;      /* previous entry */
 138         struct vm_map_entry *next;      /* next entry */
 139         RB_ENTRY(vm_map_entry) rb_entry;
 140         vm_offset_t start;              /* start address */
 141         vm_offset_t end;                /* end address */
 142         union vm_map_aux aux;           /* auxillary data */
 143         union vm_map_object object;     /* object I point to */
 144         vm_ooffset_t offset;            /* offset into object */
 145         vm_eflags_t eflags;             /* map entry flags */
 146         vm_maptype_t maptype;           /* type of VM mapping */
 147         vm_prot_t protection;           /* protection code */
 148         vm_prot_t max_protection;       /* maximum protection */
 149         vm_inherit_t inheritance;       /* inheritance */
 150         int wired_count;                /* can be paged if = 0 */
 151         vm_pindex_t lastr;              /* last read */
 152 };
 153
 154 #define MAP_ENTRY_NOSYNC                0x0001
 155 #define MAP_ENTRY_UNUSED0002            0x0002
 156 #define MAP_ENTRY_COW                   0x0004
 157 #define MAP_ENTRY_NEEDS_COPY            0x0008
 158 #define MAP_ENTRY_NOFAULT               0x0010
 159 #define MAP_ENTRY_USER_WIRED            0x0020
 160
 161 #define MAP_ENTRY_BEHAV_NORMAL          0x0000  /* default behavior */
 162 #define MAP_ENTRY_BEHAV_SEQUENTIAL      0x0040  /* expect sequential access */
 163 #define MAP_ENTRY_BEHAV_RANDOM          0x0080  /* expect random access */
 164 #define MAP_ENTRY_BEHAV_RESERVED        0x00C0  /* future use */
 165
 166 #define MAP_ENTRY_BEHAV_MASK            0x00C0
 167
 168 #define MAP_ENTRY_IN_TRANSITION         0x0100  /* entry being changed */
 169 #define MAP_ENTRY_NEEDS_WAKEUP          0x0200  /* waiter's in transition */
 170 #define MAP_ENTRY_NOCOREDUMP            0x0400  /* don't include in a core */
 171
 172 /*
 173  * flags for vm_map_[un]clip_range()
 174  */
 175 #define MAP_CLIP_NO_HOLES               0x0001
 176
 177 /*
 178  * This reserve count for vm_map_entry_reserve() should cover all nominal
 179  * single-insertion operations, including any necessary clipping.
 180  */
 181 #define MAP_RESERVE_COUNT       4
 182 #define MAP_RESERVE_SLOP        32
 183
 184 static __inline u_char
 185 vm_map_entry_behavior(struct vm_map_entry *entry)
 186 {
 187         return entry->eflags & MAP_ENTRY_BEHAV_MASK;
 188 }
 189
 190 static __inline void
 191 vm_map_entry_set_behavior(struct vm_map_entry *entry, u_char behavior)
 192 {
 193         entry->eflags = (entry->eflags & ~MAP_ENTRY_BEHAV_MASK) |
 194                 (behavior & MAP_ENTRY_BEHAV_MASK);
 195 }
 196
 197 /*
 198  *      Maps are doubly-linked lists of map entries, kept sorted
 199  *      by address.  A single hint is provided to start
 200  *      searches again from the last successful search,
 201  *      insertion, or removal.
 202  *
 203  *      Note: the lock structure cannot be the first element of vm_map
 204  *      because this can result in a running lockup between two or more
 205  *      system processes trying to kmem_alloc_wait() due to kmem_alloc_wait()
 206  *      and free tsleep/waking up 'map' and the underlying lockmgr also
 207  *      sleeping and waking up on 'map'.  The lockup occurs when the map fills
 208  *      up.  The 'exec' map, for example.
 209  */
 210 struct vm_map {
 211         struct vm_map_entry header;     /* List of entries */
 212         RB_HEAD(vm_map_rb_tree, vm_map_entry) rb_root;
 213         struct lock lock;               /* Lock for map data */
 214         int nentries;                   /* Number of entries */
 215         vm_size_t size;                 /* virtual size */
 216         u_char system_map;              /* Am I a system map? */
 217         u_char infork;                  /* Am I in fork processing? */
 218         vm_map_entry_t hint;            /* hint for quick lookups */
 219         unsigned int timestamp;         /* Version number */
 220         vm_map_entry_t first_free;      /* First free space hint */
 221         struct pmap *pmap;              /* Physical map */
 222 #define min_offset              header.start
 223 #define max_offset              header.end
 224 };
 225
 226 /*
 227  * Registered upcall
 228  */
 229 struct upcall;
 230
 231 struct vmupcall {
 232         struct vmupcall *vu_next;
 233         void            *vu_func;       /* user upcall function */
 234         void            *vu_data;       /* user data */
 235         void            *vu_ctx;        /* user context function */
 236         struct lwp      *vu_lwp;        /* process that registered upcall */
 237         int             vu_id;          /* upcall identifier */
 238         int             vu_pending;     /* upcall request pending */
 239 };
 240
 241 /*
 242  * Shareable process virtual address space.
 243  *
 244  * Refd pointers from vmresident, proc
 245  */
 246 struct vmspace {
 247         struct vm_map vm_map;   /* VM address map */
 248         struct pmap vm_pmap;    /* private physical map */
 249         int vm_unused01;
 250         caddr_t vm_shm;         /* SYS5 shared memory private data XXX */
 251 /* we copy from vm_startcopy to the end of the structure on fork */
 252 #define vm_startcopy vm_rssize
 253         segsz_t vm_rssize;      /* current resident set size in pages */
 254         segsz_t vm_swrss;       /* resident set size before last swap */
 255         segsz_t vm_tsize;       /* text size (pages) XXX */
 256         segsz_t vm_dsize;       /* data size (pages) XXX */
 257         segsz_t vm_ssize;       /* stack size (pages) */
 258         caddr_t vm_taddr;       /* user virtual address of text XXX */
 259         caddr_t vm_daddr;       /* user virtual address of data XXX */
 260         caddr_t vm_maxsaddr;    /* user VA at max stack growth */
 261         caddr_t vm_minsaddr;    /* user VA at max stack growth */
 262 #define vm_endcopy      vm_exitingcnt
 263         int     vm_exitingcnt;  /* several procsses zombied in exit1 */
 264         int     vm_upccount;    /* number of registered upcalls */
 265         int     vm_pagesupply;
 266         struct vmupcall *vm_upcalls;    /* registered upcalls */
 267         struct sysref vm_sysref;        /* sysref, refcnt, etc */
 268 };
 269
 270 /*
 271  * Resident executable holding structure.  A user program can take a snapshot
 272  * of just its VM address space (typically done just after dynamic link
 273  * libraries have completed loading) and register it as a resident
 274  * executable associated with the program binary's vnode, which is also
 275  * locked into memory.  Future execs of the vnode will start with a copy
 276  * of the resident vmspace instead of running the binary from scratch,
 277  * avoiding both the kernel ELF loader *AND* all shared library mapping and
 278  * relocation code, and will call a different entry point (the stack pointer
 279  * is reset to the top of the stack) supplied when the vmspace was registered.
 280  */
 281 struct vmresident {
 282         struct vnode    *vr_vnode;              /* associated vnode */
 283         TAILQ_ENTRY(vmresident) vr_link;        /* linked list of res sts */
 284         struct vmspace  *vr_vmspace;            /* vmspace to fork */
 285         intptr_t        vr_entry_addr;          /* registered entry point */
 286         struct sysentvec *vr_sysent;            /* system call vects */
 287         int             vr_id;                  /* registration id */
 288 };
 289
 290 #ifdef _KERNEL
 291 /*
 292  *      Macros:         vm_map_lock, etc.
 293  *      Function:
 294  *              Perform locking on the data portion of a map.  Note that
 295  *              these macros mimic procedure calls returning void.  The
 296  *              semicolon is supplied by the user of these macros, not
 297  *              by the macros themselves.  The macros can safely be used
 298  *              as unbraced elements in a higher level statement.
 299  */
 300
 301 #ifdef DIAGNOSTIC
 302 /* #define MAP_LOCK_DIAGNOSTIC 1 */
 303 #ifdef MAP_LOCK_DIAGNOSTIC
 304 #define vm_map_lock(map) \
 305         do { \
 306                 kprintf ("locking map LK_EXCLUSIVE: 0x%x\n", map); \
 307                 if (lockmgr(&(map)->lock, LK_EXCLUSIVE) != 0) { \
 308                         panic("vm_map_lock: failed to get lock"); \
 309                 } \
 310                 (map)->timestamp++; \
 311         } while(0)
 312 #else
 313 #define vm_map_lock(map) \
 314         do { \
 315                 if (lockmgr(&(map)->lock, LK_EXCLUSIVE) != 0) { \
 316                         panic("vm_map_lock: failed to get lock"); \
 317                 } \
 318                 (map)->timestamp++; \
 319         } while(0)
 320 #endif
 321 #else
 322 #define vm_map_lock(map) \
 323         do { \
 324                 lockmgr(&(map)->lock, LK_EXCLUSIVE); \
 325                 (map)->timestamp++; \
 326         } while(0)
 327 #endif /* DIAGNOSTIC */
 328
 329 #if defined(MAP_LOCK_DIAGNOSTIC)
 330 #define vm_map_unlock(map) \
 331         do { \
 332                 kprintf ("locking map LK_RELEASE: 0x%x\n", map); \
 333                 lockmgr(&(map)->lock, LK_RELEASE); \
 334         } while (0)
 335 #define vm_map_lock_read(map) \
 336         do { \
 337                 kprintf ("locking map LK_SHARED: 0x%x\n", map); \
 338                 lockmgr(&(map)->lock, LK_SHARED); \
 339         } while (0)
 340 #define vm_map_unlock_read(map) \
 341         do { \
 342                 kprintf ("locking map LK_RELEASE: 0x%x\n", map); \
 343                 lockmgr(&(map)->lock, LK_RELEASE); \
 344         } while (0)
 345 #else
 346 #define vm_map_unlock(map) \
 347         lockmgr(&(map)->lock, LK_RELEASE)
 348 #define vm_map_lock_read(map) \
 349         lockmgr(&(map)->lock, LK_SHARED)
 350 #define vm_map_unlock_read(map) \
 351         lockmgr(&(map)->lock, LK_RELEASE)
 352 #endif
 353
 354 static __inline__ int
 355 vm_map_lock_upgrade(vm_map_t map) {
 356         int error;
 357 #if defined(MAP_LOCK_DIAGNOSTIC)
 358         kprintf("locking map LK_EXCLUPGRADE: 0x%x\n", map);
 359 #endif
 360         error = lockmgr(&map->lock, LK_EXCLUPGRADE);
 361         if (error == 0)
 362                 map->timestamp++;
 363         return error;
 364 }
 365
 366 #if defined(MAP_LOCK_DIAGNOSTIC)
 367 #define vm_map_lock_downgrade(map) \
 368         do { \
 369                 kprintf ("locking map LK_DOWNGRADE: 0x%x\n", map); \
 370                 lockmgr(&(map)->lock, LK_DOWNGRADE); \
 371         } while (0)
 372 #else
 373 #define vm_map_lock_downgrade(map) \
 374         lockmgr(&(map)->lock, LK_DOWNGRADE)
 375 #endif
 376
 377 #endif /* _KERNEL */
 378
 379 /*
 380  *      Functions implemented as macros
 381  */
 382 #define         vm_map_min(map)         ((map)->min_offset)
 383 #define         vm_map_max(map)         ((map)->max_offset)
 384 #define         vm_map_pmap(map)        ((map)->pmap)
 385
 386 static __inline struct pmap *
 387 vmspace_pmap(struct vmspace *vmspace)
 388 {
 389         return &vmspace->vm_pmap;
 390 }
 391
 392 static __inline long
 393 vmspace_resident_count(struct vmspace *vmspace)
 394 {
 395         return pmap_resident_count(vmspace_pmap(vmspace));
 396 }
 397
 398 /*
 399  * Number of kernel maps and entries to statically allocate, required
 400  * during boot to bootstrap the VM system.
 401  */
 402 #define MAX_KMAP        10
 403 #define MAX_MAPENT      256
 404
 405 /*
 406  * Copy-on-write flags for vm_map operations
 407  */
 408 #define MAP_UNUSED_01           0x0001
 409 #define MAP_COPY_ON_WRITE       0x0002
 410 #define MAP_NOFAULT             0x0004
 411 #define MAP_PREFAULT            0x0008
 412 #define MAP_PREFAULT_PARTIAL    0x0010
 413 #define MAP_DISABLE_SYNCER      0x0020
 414 #define MAP_DISABLE_COREDUMP    0x0100
 415 #define MAP_PREFAULT_MADVISE    0x0200  /* from (user) madvise request */
 416
 417 /*
 418  * vm_fault option flags
 419  */
 420 #define VM_FAULT_NORMAL         0x00    /* Nothing special */
 421 #define VM_FAULT_CHANGE_WIRING  0x01    /* Change the wiring as appropriate */
 422 #define VM_FAULT_USER_WIRE      0x02    /* Likewise, but for user purposes */
 423 #define VM_FAULT_DIRTY          0x08    /* Dirty the page */
 424 #define VM_FAULT_WIRE_MASK      (VM_FAULT_CHANGE_WIRING|VM_FAULT_USER_WIRE)
 425
 426 #ifdef _KERNEL
 427
 428 extern struct sysref_class vmspace_sysref_class;
 429
 430 boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t);
 431 struct pmap;
 432 struct globaldata;
 433 void vm_map_entry_allocate_object(vm_map_entry_t);
 434 void vm_map_entry_reserve_cpu_init(struct globaldata *gd);
 435 int vm_map_entry_reserve(int);
 436 int vm_map_entry_kreserve(int);
 437 void vm_map_entry_release(int);
 438 void vm_map_entry_krelease(int);
 439 vm_map_t vm_map_create (vm_map_t, struct pmap *, vm_offset_t, vm_offset_t);
 440 int vm_map_delete (vm_map_t, vm_offset_t, vm_offset_t, int *);
 441 int vm_map_find (vm_map_t, vm_object_t, vm_ooffset_t,
 442                  vm_offset_t *, vm_size_t,
 443                  boolean_t,
 444                  vm_maptype_t,
 445                  vm_prot_t, vm_prot_t,
 446                  int);
 447 int vm_map_findspace (vm_map_t, vm_offset_t, vm_size_t, vm_offset_t, vm_offset_t *);
 448 int vm_map_inherit (vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t);
 449 void vm_map_init (struct vm_map *, vm_offset_t, vm_offset_t, pmap_t);
 450 int vm_map_insert (vm_map_t, int *, vm_object_t, vm_ooffset_t,
 451                    vm_offset_t, vm_offset_t,
 452                    vm_maptype_t,
 453                    vm_prot_t, vm_prot_t,
 454                    int);
 455 int vm_map_lookup (vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
 456     vm_pindex_t *, vm_prot_t *, boolean_t *);
 457 void vm_map_lookup_done (vm_map_t, vm_map_entry_t, int);
 458 boolean_t vm_map_lookup_entry (vm_map_t, vm_offset_t, vm_map_entry_t *);
 459 int vm_map_wire (vm_map_t, vm_offset_t, vm_offset_t, int);
 460 int vm_map_unwire (vm_map_t, vm_offset_t, vm_offset_t, boolean_t);
 461 int vm_map_clean (vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t);
 462 int vm_map_protect (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t);
 463 int vm_map_remove (vm_map_t, vm_offset_t, vm_offset_t);
 464 void vm_map_startup (void);
 465 int vm_map_submap (vm_map_t, vm_offset_t, vm_offset_t, vm_map_t);
 466 int vm_map_madvise (vm_map_t, vm_offset_t, vm_offset_t, int, off_t);
 467 void vm_map_simplify_entry (vm_map_t, vm_map_entry_t, int *);
 468 void vm_init2 (void);
 469 int vm_uiomove (vm_map_t, vm_object_t, off_t, int, vm_offset_t, int *);
 470 int vm_map_stack (vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int);
 471 int vm_map_growstack (struct proc *p, vm_offset_t addr);
 472 int vmspace_swap_count (struct vmspace *vmspace);
 473 void vm_map_set_wired_quick(vm_map_t map, vm_offset_t addr, vm_size_t size, int *);
 474
 475 #endif
 476 #endif                          /* _VM_VM_MAP_H_ */