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

     /*-
      * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
      *
      * Copyright (c) 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)vm.h        8.2 (Berkeley) 12/13/93
     *      @(#)vm_prot.h   8.1 (Berkeley) 6/11/93
     *      @(#)vm_inherit.h        8.1 (Berkeley) 6/11/93
     *
     * Copyright (c) 1987, 1990 Carnegie-Mellon University.
     * All rights reserved.
     *
     * Authors: Avadis Tevanian, Jr., Michael Wayne Young
     *
     * Permission to use, copy, modify and distribute this software and
     * its documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     *
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     *
     * Carnegie Mellon requests users of this software to return to
     *
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     *
     * any improvements or extensions that they make and grant Carnegie the
     * rights to redistribute these changes.
     *
     * $FreeBSD: releng/12.0/sys/vm/vm.h 331605 2018-03-27 03:27:02Z jeff $
     */
    
    #ifndef VM_H
    #define VM_H
    
    #include <machine/vm.h>
    
    typedef char vm_inherit_t;      /* inheritance codes */
    
    #define VM_INHERIT_SHARE        ((vm_inherit_t) 0)
    #define VM_INHERIT_COPY         ((vm_inherit_t) 1)
    #define VM_INHERIT_NONE         ((vm_inherit_t) 2)
    #define VM_INHERIT_ZERO         ((vm_inherit_t) 3)
    #define VM_INHERIT_DEFAULT      VM_INHERIT_COPY
    
    typedef u_char vm_prot_t;       /* protection codes */
    
    #define VM_PROT_NONE            ((vm_prot_t) 0x00)
    #define VM_PROT_READ            ((vm_prot_t) 0x01)
    #define VM_PROT_WRITE           ((vm_prot_t) 0x02)
    #define VM_PROT_EXECUTE         ((vm_prot_t) 0x04)
    #define VM_PROT_COPY            ((vm_prot_t) 0x08)      /* copy-on-read */
    #define VM_PROT_PRIV_FLAG       ((vm_prot_t) 0x10)
    #define VM_PROT_FAULT_LOOKUP    VM_PROT_PRIV_FLAG
    #define VM_PROT_QUICK_NOFAULT   VM_PROT_PRIV_FLAG       /* same to save bits */
    
    #define VM_PROT_ALL             (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)
    #define VM_PROT_RW              (VM_PROT_READ|VM_PROT_WRITE)
    #define VM_PROT_DEFAULT         VM_PROT_ALL
    
    enum obj_type { OBJT_DEFAULT, OBJT_SWAP, OBJT_VNODE, OBJT_DEVICE, OBJT_PHYS,
                    OBJT_DEAD, OBJT_SG, OBJT_MGTDEVICE };
    typedef u_char objtype_t;
    
    union vm_map_object;
    typedef union vm_map_object vm_map_object_t;
    
    struct vm_map_entry;
    typedef struct vm_map_entry *vm_map_entry_t;
   
   struct vm_map;
   typedef struct vm_map *vm_map_t;
   
   struct vm_object;
   typedef struct vm_object *vm_object_t;
   
   #ifndef _KERNEL
   /*
    * This is defined in <sys/types.h> for the kernel so that non-vm kernel
    * sources (mainly Mach-derived ones such as ddb) don't have to include
    * vm stuff.  Defining it there for applications might break things.
    * Define it here for "applications" that include vm headers (e.g.,
    * genassym).
    */
   typedef int boolean_t;
   
   /*
    * The exact set of memory attributes is machine dependent.  However,
    * every machine is required to define VM_MEMATTR_DEFAULT and
    * VM_MEMATTR_UNCACHEABLE.
    */
   typedef char vm_memattr_t;      /* memory attribute codes */
   
   /*
    * This is defined in <sys/types.h> for the kernel so that vnode_if.h
    * doesn't have to include <vm/vm.h>.
    */
   struct vm_page;
   typedef struct vm_page *vm_page_t;
   #endif                          /* _KERNEL */
   
   struct vm_reserv;
   typedef struct vm_reserv *vm_reserv_t;
   
   /*
    * Information passed from the machine-independant VM initialization code
    * for use by machine-dependant code (mainly for MMU support)
    */
   struct kva_md_info {
           vm_offset_t     buffer_sva;
           vm_offset_t     buffer_eva;
           vm_offset_t     clean_sva;
           vm_offset_t     clean_eva;
   };
   
   extern struct kva_md_info       kmi;
   extern void vm_ksubmap_init(struct kva_md_info *);
   
   extern int old_mlock;
   
   extern int vm_ndomains;
   
   struct ucred;
   int swap_reserve(vm_ooffset_t incr);
   int swap_reserve_by_cred(vm_ooffset_t incr, struct ucred *cred);
   void swap_reserve_force(vm_ooffset_t incr);
   void swap_release(vm_ooffset_t decr);
   void swap_release_by_cred(vm_ooffset_t decr, struct ucred *cred);
   void swapper(void);
   
   #endif                          /* VM_H */
   

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