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uvm_object.h revision 1.31.2.1 
      1 /*	$NetBSD: uvm_object.h,v 1.31.2.1 2011/11/02 21:54:01 yamt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 Charles D. Cranor and Washington University.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  *
     27  * from: Id: uvm_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp
     28  */
     29 
     30 #ifndef _UVM_UVM_OBJECT_H_
     31 #define _UVM_UVM_OBJECT_H_
     32 
     33 /*
     34  * uvm_object.h
     35  */
     36 
     37 #include <sys/queue.h>
     38 #include <sys/radixtree.h>
     39 #include <uvm/uvm_pglist.h>
     40 
     41 /*
     42  * uvm_object: all that is left of mach objects.
     43  */
     44 
     45 struct uvm_object {
     46 	kmutex_t *		vmobjlock;	/* lock on memq */
     47 	const struct uvm_pagerops *pgops;	/* pager ops */
     48 	struct pglist		memq;		/* pages in this object */
     49 	int			uo_npages;	/* # of pages in memq */
     50 	unsigned		uo_refs;	/* reference count */
     51 	struct radix_tree	uo_pages;	/* tree of pages */
     52 	LIST_HEAD(,ubc_map)	uo_ubc;		/* ubc mappings */
     53 };
     54 
     55 /*
     56  * uo_pages
     57  */
     58 
     59 #define	UVM_PAGE_DIRTY_TAG	0	/* might be dirty (!PG_CLEAN) */
     60 
     61 /*
     62  * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the
     63  * object is a kernel memory object rather than a normal one (kernel
     64  * memory objects don't have reference counts -- they never die).
     65  *
     66  * this value is used to detected kernel object mappings at uvm_unmap()
     67  * time.   normally when an object is unmapped its pages eventaully become
     68  * deactivated and then paged out and/or freed.    this is not useful
     69  * for kernel objects... when a kernel object is unmapped we always want
     70  * to free the resources associated with the mapping.   UVM_OBJ_KERN
     71  * allows us to decide which type of unmapping we want to do.
     72  */
     73 #define UVM_OBJ_KERN		(-2)
     74 
     75 #define	UVM_OBJ_IS_KERN_OBJECT(uobj)					\
     76 	((uobj)->uo_refs == UVM_OBJ_KERN)
     77 
     78 #ifdef _KERNEL
     79 
     80 extern const struct uvm_pagerops uvm_vnodeops;
     81 extern const struct uvm_pagerops uvm_deviceops;
     82 extern const struct uvm_pagerops ubc_pager;
     83 extern const struct uvm_pagerops aobj_pager;
     84 
     85 #define	UVM_OBJ_IS_VNODE(uobj)						\
     86 	((uobj)->pgops == &uvm_vnodeops)
     87 
     88 #define	UVM_OBJ_IS_DEVICE(uobj)						\
     89 	((uobj)->pgops == &uvm_deviceops)
     90 
     91 #define	UVM_OBJ_IS_VTEXT(uobj)						\
     92 	(UVM_OBJ_IS_VNODE(uobj) && uvn_text_p(uobj))
     93 
     94 #define	UVM_OBJ_IS_CLEAN(uobj)						\
     95 	(UVM_OBJ_IS_VNODE(uobj) && uvn_clean_p(uobj))
     96 
     97 /*
     98  * UVM_OBJ_NEEDS_WRITEFAULT: true if the uobj needs to detect modification.
     99  * (ie. wants to avoid writable user mappings.)
    100  *
    101  * XXX bad name
    102  */
    103 
    104 #define	UVM_OBJ_NEEDS_WRITEFAULT(uobj)					\
    105 	(UVM_OBJ_IS_VNODE(uobj) && uvn_needs_writefault_p(uobj))
    106 
    107 #define	UVM_OBJ_IS_AOBJ(uobj)						\
    108 	((uobj)->pgops == &aobj_pager)
    109 
    110 #endif /* _KERNEL */
    111 
    112 #endif /* _UVM_UVM_OBJECT_H_ */
    113