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/* $NetBSD: vm_pager.h,v 1.10 1995/03/26 20:39:15 jtc Exp $ */
/*
* Copyright (c) 1990 University of Utah.
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vm_pager.h 8.4 (Berkeley) 1/12/94
*/
/*
* Pager routine interface definition.
* For BSD we use a cleaner version of the internal pager interface.
*/
#ifndef _VM_PAGER_
#define _VM_PAGER_
TAILQ_HEAD(pagerlst, pager_struct);
struct pager_struct {
TAILQ_ENTRY(pager_struct) pg_list; /* links for list management */
caddr_t pg_handle; /* ext. handle (vp, dev, fp) */
int pg_type; /* type of pager */
int pg_flags; /* flags */
struct pagerops *pg_ops; /* pager operations */
void *pg_data; /* private pager data */
};
/* pager types */
#define PG_DFLT -1
#define PG_SWAP 0
#define PG_VNODE 1
#define PG_DEVICE 2
/* flags */
#define PG_CLUSTERGET 1
#define PG_CLUSTERPUT 2
struct pagerops {
void (*pgo_init) /* Initialize pager. */
__P((void));
vm_pager_t (*pgo_alloc) /* Allocate pager. */
__P((caddr_t, vm_size_t, vm_prot_t, vm_offset_t));
void (*pgo_dealloc) /* Disassociate. */
__P((vm_pager_t));
int (*pgo_getpages) /* Get (read) page. */
__P((vm_pager_t, vm_page_t *, int, boolean_t));
int (*pgo_putpages) /* Put (write) page. */
__P((vm_pager_t, vm_page_t *, int, boolean_t));
boolean_t (*pgo_haspage) /* Does pager have page? */
__P((vm_pager_t, vm_offset_t));
void (*pgo_cluster) /* Return range of cluster. */
__P((vm_pager_t, vm_offset_t,
vm_offset_t *, vm_offset_t *));
};
/*
* get/put return values
* OK operation was successful
* BAD specified data was out of the accepted range
* FAIL specified data was in range, but doesn't exist
* PEND operations was initiated but not completed
* ERROR error while accessing data that is in range and exists
* AGAIN temporary resource shortage prevented operation from happening
*/
#define VM_PAGER_OK 0
#define VM_PAGER_BAD 1
#define VM_PAGER_FAIL 2
#define VM_PAGER_PEND 3
#define VM_PAGER_ERROR 4
#define VM_PAGER_AGAIN 5
#ifdef _KERNEL
extern struct pagerops *dfltpagerops;
vm_pager_t vm_pager_allocate
__P((int, caddr_t, vm_size_t, vm_prot_t, vm_offset_t));
vm_page_t vm_pager_atop __P((vm_offset_t));
void vm_pager_cluster
__P((vm_pager_t, vm_offset_t,
vm_offset_t *, vm_offset_t *));
void vm_pager_clusternull
__P((vm_pager_t, vm_offset_t,
vm_offset_t *, vm_offset_t *));
void vm_pager_deallocate __P((vm_pager_t));
int vm_pager_get_pages
__P((vm_pager_t, vm_page_t *, int, boolean_t));
boolean_t vm_pager_has_page __P((vm_pager_t, vm_offset_t));
void vm_pager_init __P((void));
vm_pager_t vm_pager_lookup __P((struct pagerlst *, caddr_t));
vm_offset_t vm_pager_map_pages __P((vm_page_t *, int, boolean_t));
int vm_pager_put_pages
__P((vm_pager_t, vm_page_t *, int, boolean_t));
void vm_pager_sync __P((void));
void vm_pager_unmap_pages __P((vm_offset_t, int));
#define vm_pager_cancluster(p, b) ((p)->pg_flags & (b))
/*
* XXX compat with old interface
*/
int vm_pager_get __P((vm_pager_t, vm_page_t, boolean_t));
int vm_pager_put __P((vm_pager_t, vm_page_t, boolean_t));
#endif
#endif /* _VM_PAGER_ */
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