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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_ */