Annotation of sys/uvm/uvm_object.h, Revision 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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