* Copyright (c) 1990 University of Utah.
* Copyright (c) 1991 The Regents of the University of California.
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* %sccs.include.redist.c%
* @(#)vm_pager.h 7.2 (Berkeley) %G%
* Pager routine interface definition.
* For BSD we use a cleaner version of the internal pager interface.
queue_head_t pg_list
; /* links for list management */
caddr_t pg_handle
; /* external handle (vp, dev, fp) */
int pg_type
; /* type of pager */
struct pagerops
*pg_ops
; /* pager operations */
caddr_t pg_data
; /* private pager data */
typedef struct pager_struct
*vm_pager_t
;
void (*pgo_init
)(); /* initialize pager */
vm_pager_t (*pgo_alloc
)(); /* allocate pager */
void (*pgo_dealloc
)(); /* disassociate */
int (*pgo_getpage
)(); /* get (read) page */
int (*pgo_putpage
)(); /* put (write) page */
boolean_t (*pgo_haspage
)(); /* does pager have page? */
* 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
#define VM_PAGER_ALLOC(h, s, p) (*(pg)->pg_ops->pgo_alloc)(h, s, p)
#define VM_PAGER_DEALLOC(pg) (*(pg)->pg_ops->pgo_dealloc)(pg)
#define VM_PAGER_GET(pg, m, s) (*(pg)->pg_ops->pgo_getpage)(pg, m, s)
#define VM_PAGER_PUT(pg, m, s) (*(pg)->pg_ops->pgo_putpage)(pg, m, s)
#define VM_PAGER_HASPAGE(pg, o) (*(pg)->pg_ops->pgo_haspage)(pg, o)
vm_pager_t
vm_pager_allocate();
void vm_pager_deallocate();
boolean_t
vm_pager_has_page();
vm_offset_t
vm_pager_map_page();
void vm_pager_unmap_page();
vm_pager_t
vm_pager_lookup();
extern struct pagerops
*dfltpagerops
;