Return to uvm_object.h CVS log

Up to [local] / sys / uvm

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_ */