bsd/vm/vm_pager.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1987 Carnegie-Mellon University
  31  * All rights reserved.  The CMU software License Agreement specifies
  32  * the terms and conditions for use and redistribution.
  33  */
  34 /*
  35  *      File:   vm_pager.h
  36  *      Author: Avadis Tevanian, Jr., Michael Wayne Young
  37  *
  38  *      Copyright (C) 1986, Avadis Tevanian, Jr., Michael Wayne Young
  39  *      Copyright (C) 1985, Avadis Tevanian, Jr., Michael Wayne Young
  40  *
  41  *      Pager routine interface definition
  42  */
  43
  44 #ifndef _VM_PAGER_
  45 #define _VM_PAGER_
  46
  47 #include <mach/boolean.h>
  48
  49 struct  pager_struct {
  50         boolean_t       is_device;
  51 };
  52 typedef struct pager_struct     *vm_pager_t;
  53 #define vm_pager_null           ((vm_pager_t) 0)
  54
  55 #define PAGER_SUCCESS           0  /* page read or written */
  56 #define PAGER_ABSENT            1  /* pager does not have page */
  57 #define PAGER_ERROR             2  /* pager unable to read or write page */
  58
  59 #if 0
  60 #ifdef  KERNEL
  61 typedef int             pager_return_t;
  62
  63 extern vm_pager_t               vm_pager_allocate(void);
  64 extern void                             vm_pager_deallocate(void);
  65 extern pager_return_t   vm_pager_get(void);
  66 extern pager_return_t   vm_pager_put(void);
  67 extern boolean_t                vm_pager_has_page(void);
  68 #endif  /* KERNEL */
  69 #endif
  70
  71 #endif  /* _VM_PAGER_ */