vm_pager.h

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    1 /*
    2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_LICENSE_HEADER_START@
    5  * 
    6  * The contents of this file constitute Original Code as defined in and
    7  * are subject to the Apple Public Source License Version 1.1 (the
    8  * "License").  You may not use this file except in compliance with the
    9  * License.  Please obtain a copy of the License at
   10  * http://www.apple.com/publicsource and read it before using this file.
   11  * 
   12  * This Original Code and all software distributed under the License are
   13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
   17  * License for the specific language governing rights and limitations
   18  * under the License.
   19  * 
   20  * @APPLE_LICENSE_HEADER_END@
   21  */
   22 /* 
   23  * Mach Operating System
   24  * Copyright (c) 1987 Carnegie-Mellon University
   25  * All rights reserved.  The CMU software License Agreement specifies
   26  * the terms and conditions for use and redistribution.
   27  */
   28 /*
   29  *      File:   vm_pager.h
   30  *      Author: Avadis Tevanian, Jr., Michael Wayne Young
   31  *
   32  *      Copyright (C) 1986, Avadis Tevanian, Jr., Michael Wayne Young
   33  *      Copyright (C) 1985, Avadis Tevanian, Jr., Michael Wayne Young
   34  *
   35  *      Pager routine interface definition
   36  */
   37 
   38 #ifndef _VM_PAGER_
   39 #define _VM_PAGER_
   40 
   41 #include <mach/boolean.h>
   42 
   43 struct  pager_struct {
   44         boolean_t       is_device;
   45 };
   46 typedef struct pager_struct     *vm_pager_t;
   47 #define vm_pager_null           ((vm_pager_t) 0)
   48 
   49 #define PAGER_SUCCESS           0  /* page read or written */
   50 #define PAGER_ABSENT            1  /* pager does not have page */
   51 #define PAGER_ERROR             2  /* pager unable to read or write page */
   52 
   53 #ifdef  KERNEL
   54 typedef int             pager_return_t;
   55 
   56 extern vm_pager_t               vm_pager_allocate(void);
   57 extern void                             vm_pager_deallocate(void);
   58 extern pager_return_t   vm_pager_get(void);
   59 extern pager_return_t   vm_pager_put(void);
   60 extern boolean_t                vm_pager_has_page(void);
   61 #endif  /* KERNEL */
   62 
   63 #endif  /* _VM_PAGER_ */

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FreeBSD/Linux Kernel Cross Reference sys/bsd/vm/vm_pager.h

FreeBSD/Linux Kernel Cross Reference
sys/bsd/vm/vm_pager.h