The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/vm/vm.h

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    1 /*-
    2  * Copyright (c) 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)vm.h        8.2 (Berkeley) 12/13/93
   30  *      @(#)vm_prot.h   8.1 (Berkeley) 6/11/93
   31  *      @(#)vm_inherit.h        8.1 (Berkeley) 6/11/93
   32  *
   33  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
   34  * All rights reserved.
   35  *
   36  * Authors: Avadis Tevanian, Jr., Michael Wayne Young
   37  *
   38  * Permission to use, copy, modify and distribute this software and
   39  * its documentation is hereby granted, provided that both the copyright
   40  * notice and this permission notice appear in all copies of the
   41  * software, derivative works or modified versions, and any portions
   42  * thereof, and that both notices appear in supporting documentation.
   43  *
   44  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   45  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   46  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   47  *
   48  * Carnegie Mellon requests users of this software to return to
   49  *
   50  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   51  *  School of Computer Science
   52  *  Carnegie Mellon University
   53  *  Pittsburgh PA 15213-3890
   54  *
   55  * any improvements or extensions that they make and grant Carnegie the
   56  * rights to redistribute these changes.
   57  *
   58  * $FreeBSD: releng/6.0/sys/vm/vm.h 144501 2005-04-01 20:00:11Z jhb $
   59  */
   60 
   61 #ifndef VM_H
   62 #define VM_H
   63 
   64 typedef char vm_inherit_t;      /* inheritance codes */
   65 
   66 #define VM_INHERIT_SHARE        ((vm_inherit_t) 0)
   67 #define VM_INHERIT_COPY         ((vm_inherit_t) 1)
   68 #define VM_INHERIT_NONE         ((vm_inherit_t) 2)
   69 #define VM_INHERIT_DEFAULT      VM_INHERIT_COPY
   70 
   71 typedef u_char vm_prot_t;       /* protection codes */
   72 
   73 #define VM_PROT_NONE            ((vm_prot_t) 0x00)
   74 #define VM_PROT_READ            ((vm_prot_t) 0x01)
   75 #define VM_PROT_WRITE           ((vm_prot_t) 0x02)
   76 #define VM_PROT_EXECUTE         ((vm_prot_t) 0x04)
   77 #define VM_PROT_OVERRIDE_WRITE  ((vm_prot_t) 0x08)      /* copy-on-write */
   78 
   79 #define VM_PROT_ALL             (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)
   80 #define VM_PROT_RW              (VM_PROT_READ|VM_PROT_WRITE)
   81 #define VM_PROT_DEFAULT         VM_PROT_ALL
   82 
   83 enum obj_type { OBJT_DEFAULT, OBJT_SWAP, OBJT_VNODE, OBJT_DEVICE, OBJT_PHYS,
   84                 OBJT_DEAD };
   85 typedef u_char objtype_t;
   86 
   87 union vm_map_object;
   88 typedef union vm_map_object vm_map_object_t;
   89 
   90 struct vm_map_entry;
   91 typedef struct vm_map_entry *vm_map_entry_t;
   92 
   93 struct vm_map;
   94 typedef struct vm_map *vm_map_t;
   95 
   96 struct vm_object;
   97 typedef struct vm_object *vm_object_t;
   98 
   99 #ifndef _KERNEL
  100 /*
  101  * This is defined in <sys/types.h> for the kernel so that non-vm kernel
  102  * sources (mainly Mach-derived ones such as ddb) don't have to include
  103  * vm stuff.  Defining it there for applications might break things.
  104  * Define it here for "applications" that include vm headers (e.g.,
  105  * genassym).
  106  */
  107 typedef int boolean_t;
  108 
  109 /*
  110  * This is defined in <sys/types.h> for the kernel so that vnode_if.h
  111  * doesn't have to include <vm/vm.h>.
  112  */
  113 struct vm_page;
  114 typedef struct vm_page *vm_page_t;
  115 #endif                          /* _KERNEL */
  116 
  117 /*
  118  * Virtual memory MPSAFE temporary workarounds.
  119  */
  120 extern int debug_mpsafevm;              /* defined in vm/vm_meter.c */
  121 #define VM_LOCK_GIANT() do {                                            \
  122         if (!debug_mpsafevm)                                            \
  123                 mtx_lock(&Giant);                                       \
  124 } while (0)
  125 #define VM_UNLOCK_GIANT() do {                                          \
  126         if (!debug_mpsafevm)                                            \
  127                 mtx_unlock(&Giant);                                     \
  128 } while (0)
  129 
  130 /*
  131  * Information passed from the machine-independant VM initialization code
  132  * for use by machine-dependant code (mainly for MMU support)
  133  */
  134 struct kva_md_info {
  135         vm_offset_t     buffer_sva;
  136         vm_offset_t     buffer_eva;
  137         vm_offset_t     clean_sva;
  138         vm_offset_t     clean_eva;
  139         vm_offset_t     pager_sva;
  140         vm_offset_t     pager_eva;
  141 };
  142 
  143 extern struct kva_md_info       kmi;
  144 extern void vm_ksubmap_init(struct kva_md_info *);
  145 
  146 #endif                          /* VM_H */
  147 

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