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