* 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.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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
* from: @(#)vm_page.h 7.3 (Berkeley) 4/21/91
* $Id: vm_page.h,v 1.7 1994/01/14 16:27:27 davidg Exp $
* 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.
* Resident memory system definitions.
* Management of resident (logical) pages.
* A small structure is kept for each resident
* page, indexed by page number. Each structure
* is an element of several lists:
* A hash table bucket used to quickly
* perform object/offset lookups
* A list of all pages for a given object,
* so they can be quickly deactivated at
* An ordered list of pages due for pageout.
* In addition, the structure contains the object
* and offset to which this page belongs (for pageout),
* and sundry status bits.
* Fields in this structure are locked either by the lock on the
* object that the page belongs to (O) or by the lock on the page
#define PG_INACTIVE 0x0001
#define PG_LAUNDRY 0x0004
#define PG_COPY_ON_WRITE 0x0080
#define PG_FICTITIOUS 0x0100
#define PG_PAGEROWNED 0x0800
queue_chain_t pageq
; /* queue info for FIFO */
/* queue or free list (P) */
queue_chain_t hashq
; /* hash table links (O)*/
queue_chain_t listq
; /* all pages in same object (O)*/
vm_object_t object
; /* which object am I in (O,P)*/
vm_offset_t offset
; /* offset into that object (O,P) */
unsigned int wire_count
; /* how many wired down maps use me? */
unsigned short flags
; /* bit encoded flags */
unsigned short deact
; /* deactivation count */
vm_offset_t phys_addr
; /* physical address of page */
typedef struct vm_page
*vm_page_t
;
#define VM_PAGE_CHECK(mem) { \
if ((((unsigned int) mem) < ((unsigned int) &vm_page_array[0])) || \
(((unsigned int) mem) > ((unsigned int) &vm_page_array[last_page-first_page])) || \
((mem->flags & PG_ACTIVE) && (mem->flags & PG_INACTIVE)) \
) panic("vm_page_check: not valid!"); \
#else /* VM_PAGE_DEBUG */
#define VM_PAGE_CHECK(mem)
#endif /* VM_PAGE_DEBUG */
* Each pageable resident page falls into one of three lists:
* Available for allocation now.
* Not referenced in any map, but still has an
* object/offset-page mapping, and may be dirty.
* This is the list of pages that should be
* A list of pages which have been placed in
* at least one physical map. This list is
* ordered, in LRU-like fashion.
queue_head_t vm_page_queue_free
; /* memory free queue */
queue_head_t vm_page_queue_active
; /* active memory queue */
queue_head_t vm_page_queue_inactive
; /* inactive memory queue */
vm_page_t vm_page_array
; /* First resident page in table */
long first_page
; /* first physical page number */
/* ... represented in vm_page_array */
long last_page
; /* last physical page number */
/* ... represented in vm_page_array */
vm_offset_t first_phys_addr
; /* physical address for first_page */
vm_offset_t last_phys_addr
; /* physical address for last_page */
int vm_page_free_count
; /* How many pages are free? */
int vm_page_active_count
; /* How many pages are active? */
int vm_page_inactive_count
; /* How many pages are inactive? */
int vm_page_wire_count
; /* How many pages are wired? */
int vm_page_free_target
; /* How many do we want free? */
int vm_page_free_min
; /* When to wakeup pageout */
int vm_page_inactive_target
;/* How many do we want inactive? */
int vm_page_free_reserved
; /* How many pages reserved to do pageout */
int vm_page_laundry_count
; /* How many pages being laundered? */
#define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr)
#define IS_VM_PHYSADDR(pa) \
((pa) >= first_phys_addr && (pa) <= last_phys_addr)
#define PHYS_TO_VM_PAGE(pa) \
(&vm_page_array[atop(pa) - first_page ])
simple_lock_data_t vm_page_queue_lock
; /* lock on active and inactive
simple_lock_data_t vm_page_queue_free_lock
;
/* lock on free page queue */
vm_offset_t
vm_page_startup();
vm_page_t
vm_page_lookup();
vm_page_t
vm_page_alloc();
void vm_page_deactivate();
boolean_t
vm_page_zero_fill();
* Functions implemented as macros
#define PAGE_ASSERT_WAIT(m, interruptible) { \
(m)->flags |= PG_WANTED; \
assert_wait((int) (m), (interruptible)); \
#define PAGE_WAKEUP(m) { \
(m)->flags &= ~PG_BUSY; \
if ((m)->flags & PG_WANTED) { \
(m)->flags &= ~PG_WANTED; \
thread_wakeup((int) (m)); \
#define vm_page_lock_queues() simple_lock(&vm_page_queue_lock)
#define vm_page_unlock_queues() simple_unlock(&vm_page_queue_lock)
#define vm_page_set_modified(m) { (m)->flags &= ~PG_CLEAN; }
/* Some pmap things are declared here for the convenience of other bits of
extern void pmap_bootstrap(vm_offset_t
, vm_offset_t
);
extern void pmap_init(vm_offset_t
, vm_offset_t
);
extern vm_offset_t
pmap_map(vm_offset_t
, vm_offset_t
, vm_offset_t
, int);
extern void pmap_remove_all(vm_offset_t
);
extern void pmap_copy_on_write(vm_offset_t
);
extern void pmap_page_protect(vm_offset_t
, vm_prot_t
);
extern void pmap_update(void);
extern void pmap_zero_page(vm_offset_t
);
extern void pmap_copy_page(vm_offset_t
, vm_offset_t
);
extern void pmap_clear_modify(vm_offset_t
);
extern void pmap_clear_reference(vm_offset_t
);
extern boolean_t
pmap_is_referenced(vm_offset_t
);
extern boolean_t
pmap_is_modified(vm_offset_t
);
extern vm_offset_t
pmap_phys_ddress(int);
* these macros are *MUCH* faster on a 386/486 type machine
* eventually they need to be implemented correctly and put
* somewhere in the machine dependant stuff.
#define vm_disable_intr() (disable_intr(), 0)
#define vm_set_intr(spl) enable_intr()