* Copyright (c) 1991 Regents of the University of California.
* This code is derived from software contributed to Berkeley by
* The Mach Operating System project at Carnegie-Mellon University.
* %sccs.include.redist.c%
* @(#)vm_object.h 7.4 (Berkeley) %G%
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
* Authors: Avadis Tevanian, Jr., Michael Wayne Young
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
* Carnegie Mellon requests users of this software to return to
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
* Virtual memory object module definitions.
* vm_object_t Virtual memory object.
queue_chain_t memq
; /* Resident memory */
queue_chain_t object_list
; /* list of all objects */
u_short flags
; /* see below */
u_short paging_in_progress
; /* Paging (in or out) so
don't collapse or destroy */
simple_lock_data_t Lock
; /* Synchronization */
int ref_count
; /* How many refs?? */
vm_size_t size
; /* Object size */
/* number of resident pages */
struct vm_object
*copy
; /* Object that holds copies of
vm_pager_t pager
; /* Where to get data */
vm_offset_t paging_offset
; /* Offset into paging space */
struct vm_object
*shadow
; /* My shadow */
vm_offset_t shadow_offset
; /* Offset in shadow */
queue_chain_t cached_list
; /* for persistence */
#define OBJ_CANPERSIST 0x0001 /* allow to persist */
#define OBJ_INTERNAL 0x0002 /* internally created object */
#define OBJ_ACTIVE 0x0004 /* used to mark active objects */
typedef struct vm_object
*vm_object_t
;
struct vm_object_hash_entry
{
queue_chain_t hash_links
; /* hash chain links */
vm_object_t object
; /* object we represent */
typedef struct vm_object_hash_entry
*vm_object_hash_entry_t
;
queue_head_t vm_object_cached_list
; /* list of objects persisting */
int vm_object_cached
; /* size of cached list */
simple_lock_data_t vm_cache_lock
; /* lock for object cache */
queue_head_t vm_object_list
; /* list of allocated objects */
long vm_object_count
; /* count of all objects */
simple_lock_data_t vm_object_list_lock
;
/* lock for object list and count */
vm_object_t kernel_object
; /* the single kernel object */
#define vm_object_cache_lock() simple_lock(&vm_cache_lock)
#define vm_object_cache_unlock() simple_unlock(&vm_cache_lock)
* Declare procedures that operate on VM objects.
void vm_object_terminate();
vm_object_t
vm_object_allocate();
void vm_object_reference();
void vm_object_deallocate();
void vm_object_pmap_copy();
void vm_object_pmap_remove();
void vm_object_page_remove();
void vm_object_collapse();
vm_object_t
vm_object_lookup();
void vm_object_setpager();
#define vm_object_cache(pager) pager_cache(vm_object_lookup(pager),TRUE)
#define vm_object_uncache(pager) pager_cache(vm_object_lookup(pager),FALSE)
void vm_object_cache_clear();
#define vm_object_lock_init(object) { simple_lock_init(&(object)->Lock); (object)->LockHolder = 0; }
#define vm_object_lock(object) { simple_lock(&(object)->Lock); (object)->LockHolder = (int) current_thread(); }
#define vm_object_unlock(object) { (object)->LockHolder = 0; simple_unlock(&(object)->Lock); }
#define vm_object_lock_try(object) (simple_lock_try(&(object)->Lock) ? ( ((object)->LockHolder = (int) current_thread()) , TRUE) : FALSE)
#define vm_object_sleep(event, object, interruptible) \
{ (object)->LockHolder = 0; thread_sleep((event), &(object)->Lock, (interruptible)); }
#define vm_object_lock_init(object) simple_lock_init(&(object)->Lock)
#define vm_object_lock(object) simple_lock(&(object)->Lock)
#define vm_object_unlock(object) simple_unlock(&(object)->Lock)
#define vm_object_lock_try(object) simple_lock_try(&(object)->Lock)
#define vm_object_sleep(event, object, interruptible) \
thread_sleep((event), &(object)->Lock, (interruptible))