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Diffstat (limited to 'sys/vm/vm_pager.h')
| -rw-r--r-- | sys/vm/vm_pager.h | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/sys/vm/vm_pager.h b/sys/vm/vm_pager.h new file mode 100644 index 00000000000..49f5c0782a3 --- /dev/null +++ b/sys/vm/vm_pager.h @@ -0,0 +1,139 @@ +/* $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_ */ |