Return to uvm_object.h CVS log

Up to [cvs.NetBSD.org] / src / sys / uvm

Annotation of src/sys/uvm/uvm_object.h, Revision 1.8

1.8     ! thorpej     1: /*     $NetBSD: uvm_object.h,v 1.7 1999/05/25 00:09:01 thorpej Exp $   */
1.1       mrg         2:
                      3: /*
                      4:  *
                      5:  * Copyright (c) 1997 Charles D. Cranor and Washington University.
                      6:  * All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *      This product includes software developed by Charles D. Cranor and
                     19:  *      Washington University.
                     20:  * 4. The name of the author may not be used to endorse or promote products
                     21:  *    derived from this software without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     24:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     25:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     26:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     27:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     28:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     29:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     30:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     31:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     32:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.3       mrg        33:  *
                     34:  * from: Id: uvm_object.h,v 1.1.2.2 1998/01/04 22:44:51 chuck Exp
1.1       mrg        35:  */
                     36:
1.4       perry      37: #ifndef _UVM_UVM_OBJECT_H_
                     38: #define _UVM_UVM_OBJECT_H_
                     39:
1.1       mrg        40: /*
                     41:  * uvm_object.h
                     42:  */
                     43:
                     44: /*
                     45:  * uvm_object: all that is left of mach objects.
                     46:  */
                     47:
                     48: struct uvm_object {
1.5       mrg        49:        simple_lock_data_t      vmobjlock;      /* lock on memq */
                     50:        struct uvm_pagerops     *pgops;         /* pager ops */
                     51:        struct pglist           memq;           /* pages in this object */
                     52:        int                     uo_npages;      /* # of pages in memq */
                     53:        int                     uo_refs;        /* reference count */
1.1       mrg        54: };
                     55:
                     56: /*
                     57:  * UVM_OBJ_KERN is a 'special' uo_refs value which indicates that the
                     58:  * object is a kernel memory object rather than a normal one (kernel
                     59:  * memory objects don't have reference counts -- they never die).
                     60:  *
                     61:  * this value is used to detected kernel object mappings at uvm_unmap()
                     62:  * time.   normally when an object is unmapped its pages eventaully become
                     63:  * deactivated and then paged out and/or freed.    this is not useful
                     64:  * for kernel objects... when a kernel object is unmapped we always want
                     65:  * to free the resources associated with the mapping.   UVM_OBJ_KERN
                     66:  * allows us to decide which type of unmapping we want to do.
1.8     ! thorpej    67:  *
        !            68:  * in addition, we have kernel objects which may be used in an
        !            69:  * interrupt context.  these objects get their mappings entered
        !            70:  * with pmap_kenter*() and removed with pmap_kremove(), which
        !            71:  * are safe to call in interrupt context, and must be used ONLY
        !            72:  * for wired kernel mappings in these objects and their associated
        !            73:  * maps.
1.1       mrg        74:  */
1.8     ! thorpej    75: #define UVM_OBJ_KERN           (-2)
        !            76: #define        UVM_OBJ_KERN_INTRSAFE   (-3)
        !            77:
        !            78: #define        UVM_OBJ_IS_KERN_OBJECT(uobj)                                    \
        !            79:        ((uobj)->uo_refs == UVM_OBJ_KERN ||                             \
        !            80:         (uobj)->uo_refs == UVM_OBJ_KERN_INTRSAFE)
1.7       thorpej    81:
1.8     ! thorpej    82: #define        UVM_OBJ_IS_INTRSAFE_OBJECT(uobj)                                \
        !            83:        ((uobj)->uo_refs == UVM_OBJ_KERN_INTRSAFE)
1.1       mrg        84:
1.4       perry      85: #endif /* _UVM_UVM_OBJECT_H_ */