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/9.1/sys/vm/vm.h 236925 2012-06-11 21:25:20Z kib $
   59  */
   60 
   61 #ifndef VM_H
   62 #define VM_H
   63 
   64 #include <machine/vm.h>
   65 
   66 typedef char vm_inherit_t;      /* inheritance codes */
   67 
   68 #define VM_INHERIT_SHARE        ((vm_inherit_t) 0)
   69 #define VM_INHERIT_COPY         ((vm_inherit_t) 1)
   70 #define VM_INHERIT_NONE         ((vm_inherit_t) 2)
   71 #define VM_INHERIT_DEFAULT      VM_INHERIT_COPY
   72 
   73 typedef u_char vm_prot_t;       /* protection codes */
   74 
   75 #define VM_PROT_NONE            ((vm_prot_t) 0x00)
   76 #define VM_PROT_READ            ((vm_prot_t) 0x01)
   77 #define VM_PROT_WRITE           ((vm_prot_t) 0x02)
   78 #define VM_PROT_EXECUTE         ((vm_prot_t) 0x04)
   79 #define VM_PROT_COPY            ((vm_prot_t) 0x08)      /* copy-on-read */
   80 
   81 #define VM_PROT_ALL             (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)
   82 #define VM_PROT_RW              (VM_PROT_READ|VM_PROT_WRITE)
   83 #define VM_PROT_DEFAULT         VM_PROT_ALL
   84 
   85 enum obj_type { OBJT_DEFAULT, OBJT_SWAP, OBJT_VNODE, OBJT_DEVICE, OBJT_PHYS,
   86                 OBJT_DEAD, OBJT_SG, OBJT_MGTDEVICE };
   87 typedef u_char objtype_t;
   88 
   89 union vm_map_object;
   90 typedef union vm_map_object vm_map_object_t;
   91 
   92 struct vm_map_entry;
   93 typedef struct vm_map_entry *vm_map_entry_t;
   94 
   95 struct vm_map;
   96 typedef struct vm_map *vm_map_t;
   97 
   98 struct vm_object;
   99 typedef struct vm_object *vm_object_t;
  100 
  101 #ifndef _KERNEL
  102 /*
  103  * This is defined in <sys/types.h> for the kernel so that non-vm kernel
  104  * sources (mainly Mach-derived ones such as ddb) don't have to include
  105  * vm stuff.  Defining it there for applications might break things.
  106  * Define it here for "applications" that include vm headers (e.g.,
  107  * genassym).
  108  */
  109 typedef int boolean_t;
  110 
  111 /*
  112  * The exact set of memory attributes is machine dependent.  However, every
  113  * machine is required to define VM_MEMATTR_DEFAULT.
  114  */
  115 typedef char vm_memattr_t;      /* memory attribute codes */
  116 
  117 /*
  118  * This is defined in <sys/types.h> for the kernel so that vnode_if.h
  119  * doesn't have to include <vm/vm.h>.
  120  */
  121 struct vm_page;
  122 typedef struct vm_page *vm_page_t;
  123 #endif                          /* _KERNEL */
  124 
  125 struct vm_reserv;
  126 typedef struct vm_reserv *vm_reserv_t;
  127 
  128 /*
  129  * Information passed from the machine-independant VM initialization code
  130  * for use by machine-dependant code (mainly for MMU support)
  131  */
  132 struct kva_md_info {
  133         vm_offset_t     buffer_sva;
  134         vm_offset_t     buffer_eva;
  135         vm_offset_t     clean_sva;
  136         vm_offset_t     clean_eva;
  137         vm_offset_t     pager_sva;
  138         vm_offset_t     pager_eva;
  139 };
  140 
  141 extern struct kva_md_info       kmi;
  142 extern void vm_ksubmap_init(struct kva_md_info *);
  143 
  144 struct ucred;
  145 int swap_reserve(vm_ooffset_t incr);
  146 int swap_reserve_by_cred(vm_ooffset_t incr, struct ucred *cred);
  147 void swap_reserve_force(vm_ooffset_t incr);
  148 void swap_release(vm_ooffset_t decr);
  149 void swap_release_by_cred(vm_ooffset_t decr, struct ucred *cred);
  150 
  151 #endif                          /* VM_H */
  152 

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