mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-29 12:03:03 +00:00
282 lines
9.3 KiB
C
282 lines
9.3 KiB
C
/*
|
|
* 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 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
|
|
* 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.
|
|
*
|
|
* from: @(#)vm_page.h 8.2 (Berkeley) 12/13/93
|
|
*
|
|
*
|
|
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* $Id: vm_page.h,v 1.8 1994/10/17 10:43:56 davidg Exp $
|
|
*/
|
|
|
|
/*
|
|
* Resident memory system definitions.
|
|
*/
|
|
|
|
#ifndef _VM_PAGE_
|
|
#define _VM_PAGE_
|
|
|
|
/*
|
|
* 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
|
|
* time of deallocation.
|
|
*
|
|
* 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
|
|
* queues (P).
|
|
*/
|
|
|
|
TAILQ_HEAD(pglist, vm_page);
|
|
|
|
struct vm_page {
|
|
TAILQ_ENTRY(vm_page) pageq; /* queue info for FIFO
|
|
* queue or free list (P) */
|
|
TAILQ_ENTRY(vm_page) hashq; /* hash table links (O)*/
|
|
TAILQ_ENTRY(vm_page) listq; /* pages in same object (O)*/
|
|
|
|
vm_object_t object; /* which object am I in (O,P)*/
|
|
vm_offset_t offset; /* offset into object (O,P) */
|
|
|
|
u_short wire_count; /* wired down maps refs (P) */
|
|
u_short flags; /* see below */
|
|
short hold_count; /* page hold count */
|
|
u_short act_count; /* page usage count */
|
|
u_short busy; /* page busy count */
|
|
|
|
vm_offset_t phys_addr; /* physical address of page */
|
|
};
|
|
|
|
/*
|
|
* These are the flags defined for vm_page.
|
|
*
|
|
* Note: PG_FILLED and PG_DIRTY are added for the filesystems.
|
|
*/
|
|
#define PG_INACTIVE 0x0001 /* page is in inactive list (P) */
|
|
#define PG_ACTIVE 0x0002 /* page is in active list (P) */
|
|
#define PG_LAUNDRY 0x0004 /* page is being cleaned now (P)*/
|
|
#define PG_CLEAN 0x0008 /* page has not been modified */
|
|
#define PG_BUSY 0x0010 /* page is in transit (O) */
|
|
#define PG_WANTED 0x0020 /* someone is waiting for page (O) */
|
|
#define PG_TABLED 0x0040 /* page is in VP table (O) */
|
|
#define PG_COPYONWRITE 0x0080 /* must copy page before changing (O) */
|
|
#define PG_FICTITIOUS 0x0100 /* physical page doesn't exist (O) */
|
|
#define PG_FAKE 0x0200 /* page is placeholder for pagein (O) */
|
|
#define PG_FILLED 0x0400 /* client flag to set when filled */
|
|
#define PG_DIRTY 0x0800 /* client flag to set when dirty */
|
|
#define PG_REFERENCED 0x1000 /* page has been referenced */
|
|
#define PG_VMIO 0x2000 /* VMIO flag */
|
|
#define PG_PAGEROWNED 0x4000 /* DEBUG: async paging op in progress */
|
|
#define PG_FREE 0x8000 /* page is in free list */
|
|
|
|
#if VM_PAGE_DEBUG
|
|
#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 | PG_INACTIVE)) == \
|
|
(PG_ACTIVE | PG_INACTIVE))) \
|
|
panic("vm_page_check: not valid!"); \
|
|
}
|
|
#else /* VM_PAGE_DEBUG */
|
|
#define VM_PAGE_CHECK(mem)
|
|
#endif /* VM_PAGE_DEBUG */
|
|
|
|
#ifdef KERNEL
|
|
/*
|
|
* Each pageable resident page falls into one of three lists:
|
|
*
|
|
* free
|
|
* Available for allocation now.
|
|
* inactive
|
|
* 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
|
|
* paged out next.
|
|
* active
|
|
* A list of pages which have been placed in
|
|
* at least one physical map. This list is
|
|
* ordered, in LRU-like fashion.
|
|
*/
|
|
|
|
extern
|
|
struct pglist vm_page_queue_free; /* memory free queue */
|
|
extern
|
|
struct pglist vm_page_queue_active; /* active memory queue */
|
|
extern
|
|
struct pglist vm_page_queue_inactive; /* inactive memory queue */
|
|
|
|
extern
|
|
vm_page_t vm_page_array; /* First resident page in table */
|
|
extern
|
|
long first_page; /* first physical page number */
|
|
/* ... represented in vm_page_array */
|
|
extern
|
|
long last_page; /* last physical page number */
|
|
/* ... represented in vm_page_array */
|
|
/* [INCLUSIVE] */
|
|
extern
|
|
vm_offset_t first_phys_addr; /* physical address for first_page */
|
|
extern
|
|
vm_offset_t last_phys_addr; /* physical address for last_page */
|
|
|
|
#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 ])
|
|
|
|
extern
|
|
simple_lock_data_t vm_page_queue_lock; /* lock on active and inactive
|
|
page queues */
|
|
extern /* lock on free page queue */
|
|
simple_lock_data_t vm_page_queue_free_lock;
|
|
|
|
/*
|
|
* 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; \
|
|
wakeup((caddr_t) (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; }
|
|
|
|
#define VM_PAGE_INIT(mem, object, offset) { \
|
|
(mem)->flags = PG_BUSY | PG_CLEAN | PG_FAKE; \
|
|
vm_page_insert((mem), (object), (offset)); \
|
|
(mem)->wire_count = 0; \
|
|
(mem)->hold_count = 0; \
|
|
(mem)->act_count = 0; \
|
|
}
|
|
|
|
void vm_page_activate __P((vm_page_t));
|
|
vm_page_t vm_page_alloc __P((vm_object_t, vm_offset_t));
|
|
void vm_page_copy __P((vm_page_t, vm_page_t));
|
|
void vm_page_deactivate __P((vm_page_t));
|
|
void vm_page_free __P((vm_page_t));
|
|
void vm_page_insert __P((vm_page_t, vm_object_t, vm_offset_t));
|
|
vm_page_t vm_page_lookup __P((vm_object_t, vm_offset_t));
|
|
void vm_page_remove __P((vm_page_t));
|
|
void vm_page_rename __P((vm_page_t, vm_object_t, vm_offset_t));
|
|
vm_offset_t vm_page_startup __P((vm_offset_t, vm_offset_t, vm_offset_t));
|
|
void vm_page_unwire __P((vm_page_t));
|
|
void vm_page_wire __P((vm_page_t));
|
|
boolean_t vm_page_zero_fill __P((vm_page_t));
|
|
|
|
|
|
/*
|
|
* Keep page from being freed by the page daemon
|
|
* much of the same effect as wiring, except much lower
|
|
* overhead and should be used only for *very* temporary
|
|
* holding ("wiring").
|
|
*/
|
|
static inline void
|
|
vm_page_hold(mem)
|
|
vm_page_t mem;
|
|
{
|
|
mem->hold_count++;
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
#include <sys/systm.h> /* make GCC shut up */
|
|
#endif
|
|
|
|
static inline void
|
|
vm_page_unhold(mem)
|
|
vm_page_t mem;
|
|
{
|
|
#ifdef DIAGNOSTIC
|
|
if( --mem->hold_count < 0)
|
|
panic("vm_page_unhold: hold count < 0!!!");
|
|
#else
|
|
--mem->hold_count;
|
|
#endif
|
|
}
|
|
|
|
#endif /* KERNEL */
|
|
#endif /* !_VM_PAGE_ */
|