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Annotation of kernel/vm/vm_pager.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* 
        !            26:  * Mach Operating System
        !            27:  * Copyright (c) 1987 Carnegie-Mellon University
        !            28:  * All rights reserved.  The CMU software License Agreement specifies
        !            29:  * the terms and conditions for use and redistribution.
        !            30:  */
        !            31: /*
        !            32:  *     File:   vm_pager.h
        !            33:  *     Author: Avadis Tevanian, Jr., Michael Wayne Young
        !            34:  *
        !            35:  *     Copyright (C) 1986, Avadis Tevanian, Jr., Michael Wayne Young
        !            36:  *     Copyright (C) 1985, Avadis Tevanian, Jr., Michael Wayne Young
        !            37:  *
        !            38:  *     Pager routine interface definition
        !            39:  */
        !            40: 
        !            41: #ifndef        _VM_PAGER_
        !            42: #define        _VM_PAGER_
        !            43: 
        !            44: #import <mach/boolean.h>
        !            45: 
        !            46: struct pager_struct {
        !            47:        boolean_t       is_device;
        !            48: };
        !            49: typedef        struct pager_struct     *vm_pager_t;
        !            50: #define        vm_pager_null           ((vm_pager_t) 0)
        !            51: 
        !            52: #define        PAGER_SUCCESS           0  /* page read or written */
        !            53: #define        PAGER_ABSENT            1  /* pager does not have page */
        !            54: #define        PAGER_ERROR             2  /* pager unable to read or write page */
        !            55: 
        !            56: #ifdef KERNEL
        !            57: typedef        int             pager_return_t;
        !            58: 
        !            59: vm_pager_t     vm_pager_allocate();
        !            60: void           vm_pager_deallocate();
        !            61: pager_return_t vm_pager_get();
        !            62: pager_return_t vm_pager_put();
        !            63: boolean_t      vm_pager_has_page();
        !            64: #endif /* KERNEL */
        !            65: 
        !            66: #endif /* _VM_PAGER_ */

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