Annotation of sys/uvm/uvm_object.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: uvm_object.h,v 1.10 2007/04/11 12:10:42 art Exp $ */
2: /* $NetBSD: uvm_object.h,v 1.11 2001/03/09 01:02:12 chs Exp $ */
3:
4: /*
5: *
6: * Copyright (c) 1997 Charles D. Cranor and Washington University.
7: * All rights reserved.
8: *
9: * Redistribution and use in source and binary forms, with or without
10: * modification, are permitted provided that the following conditions
11: * are met:
12: * 1. Redistributions of source code must retain the above copyright
13: * notice, this list of conditions and the following disclaimer.
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in the
16: * documentation and/or other materials provided with the distribution.
17: * 3. All advertising materials mentioning features or use of this software
18: * must display the following acknowledgement:
19: * This product includes software developed by Charles D. Cranor and
20: * Washington University.
21: * 4. The name of the author may not be used to endorse or promote products
22: * derived from this software without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34: *
35: * from: Id: uvm_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp
36: */
37:
38: #ifndef _UVM_UVM_OBJECT_H_
39: #define _UVM_UVM_OBJECT_H_
40:
41: /*
42: * uvm_object.h
43: */
44:
45: /*
46: * uvm_object: all that is left of mach objects.
47: */
48:
49: struct uvm_object {
50: simple_lock_data_t vmobjlock; /* lock on memq */
51: struct uvm_pagerops *pgops; /* pager ops */
52: struct pglist memq; /* pages in this object */
53: int uo_npages; /* # of pages in memq */
54: int uo_refs; /* reference count */
55: };
56:
57: /*
58: * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the
59: * object is a kernel memory object rather than a normal one (kernel
60: * memory objects don't have reference counts -- they never die).
61: *
62: * this value is used to detected kernel object mappings at uvm_unmap()
63: * time. normally when an object is unmapped its pages eventaully become
64: * deactivated and then paged out and/or freed. this is not useful
65: * for kernel objects... when a kernel object is unmapped we always want
66: * to free the resources associated with the mapping. UVM_OBJ_KERN
67: * allows us to decide which type of unmapping we want to do.
68: *
69: * in addition, we have kernel objects which may be used in an
70: * interrupt context. these objects get their mappings entered
71: * with pmap_kenter*() and removed with pmap_kremove(), which
72: * are safe to call in interrupt context, and must be used ONLY
73: * for wired kernel mappings in these objects and their associated
74: * maps.
75: */
76: #define UVM_OBJ_KERN (-2)
77:
78: #define UVM_OBJ_IS_KERN_OBJECT(uobj) \
79: ((uobj)->uo_refs == UVM_OBJ_KERN)
80:
81: #ifdef _KERNEL
82:
83: extern struct uvm_pagerops uvm_vnodeops;
84: extern struct uvm_pagerops uvm_deviceops;
85:
86: #define UVM_OBJ_IS_VNODE(uobj) \
87: ((uobj)->pgops == &uvm_vnodeops)
88:
89: #define UVM_OBJ_IS_DEVICE(uobj) \
90: ((uobj)->pgops == &uvm_deviceops)
91:
92: #define UVM_OBJ_IS_VTEXT(uobj) \
93: ((uobj)->pgops == &uvm_vnodeops && \
94: ((struct vnode *)uobj)->v_flag & VTEXT)
95:
96:
97: #endif /* _KERNEL */
98:
99: #endif /* _UVM_UVM_OBJECT_H_ */
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