FreeBSD/Linux Kernel Cross Reference
sys/uvm/uvm_object.h

     /*      $NetBSD: uvm_object.h,v 1.17 2003/11/29 19:06:48 yamt Exp $     */
     
     /*
      *
      * Copyright (c) 1997 Charles D. Cranor and Washington University.
      * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Charles D. Cranor and
     *      Washington University.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
     *
     * from: Id: uvm_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp
     */
    
    #ifndef _UVM_UVM_OBJECT_H_
    #define _UVM_UVM_OBJECT_H_
    
    /*
     * uvm_object.h
     */
    
    /*
     * uvm_object: all that is left of mach objects.
     */
    
    struct uvm_object {
            struct simplelock       vmobjlock;      /* lock on memq */
            struct uvm_pagerops     *pgops;         /* pager ops */
            struct pglist           memq;           /* pages in this object */
            int                     uo_npages;      /* # of pages in memq */
            int                     uo_refs;        /* reference count */
    };
    
    /*
     * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the
     * object is a kernel memory object rather than a normal one (kernel
     * memory objects don't have reference counts -- they never die).
     *
     * this value is used to detected kernel object mappings at uvm_unmap()
     * time.   normally when an object is unmapped its pages eventaully become
     * deactivated and then paged out and/or freed.    this is not useful
     * for kernel objects... when a kernel object is unmapped we always want
     * to free the resources associated with the mapping.   UVM_OBJ_KERN
     * allows us to decide which type of unmapping we want to do.
     */
    #define UVM_OBJ_KERN            (-2)
    
    #define UVM_OBJ_IS_KERN_OBJECT(uobj)                                    \
            ((uobj)->uo_refs == UVM_OBJ_KERN)
    
    #ifdef _KERNEL
    
    extern struct uvm_pagerops uvm_vnodeops;
    extern struct uvm_pagerops uvm_deviceops;
    extern struct uvm_pagerops ubc_pager;
    extern struct uvm_pagerops aobj_pager;
    
    #define UVM_OBJ_IS_VNODE(uobj)                                          \
            ((uobj)->pgops == &uvm_vnodeops)
    
    #define UVM_OBJ_IS_DEVICE(uobj)                                         \
            ((uobj)->pgops == &uvm_deviceops)
    
    #define UVM_OBJ_IS_VTEXT(uobj)                                          \
            ((uobj)->pgops == &uvm_vnodeops &&                              \
             ((struct vnode *)uobj)->v_flag & VEXECMAP)
    
    #define UVM_OBJ_IS_AOBJ(uobj)                                           \
            ((uobj)->pgops == &aobj_pager)
    
    #endif /* _KERNEL */
    
    #endif /* _UVM_UVM_OBJECT_H_ */

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