9eab548476
longer abused to store pointer to slab. Remove it. Reviewed by: alc Sponsored by: The FreeBSD Foundation Approved by: re (hrs)
662 lines
22 KiB
C
662 lines
22 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_page.h 8.2 (Berkeley) 12/13/93
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $FreeBSD$
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*/
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/*
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* Resident memory system definitions.
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*/
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#ifndef _VM_PAGE_
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#define _VM_PAGE_
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#include <vm/pmap.h>
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/*
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* Management of resident (logical) pages.
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*
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* A small structure is kept for each resident
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* page, indexed by page number. Each structure
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* is an element of several collections:
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*
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* A radix tree used to quickly
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* perform object/offset lookups
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*
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* A list of all pages for a given object,
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* so they can be quickly deactivated at
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* time of deallocation.
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*
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* An ordered list of pages due for pageout.
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*
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* In addition, the structure contains the object
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* and offset to which this page belongs (for pageout),
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* and sundry status bits.
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*
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* In general, operations on this structure's mutable fields are
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* synchronized using either one of or a combination of the lock on the
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* object that the page belongs to (O), the pool lock for the page (P),
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* or the lock for either the free or paging queue (Q). If a field is
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* annotated below with two of these locks, then holding either lock is
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* sufficient for read access, but both locks are required for write
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* access.
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*
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* In contrast, the synchronization of accesses to the page's
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* dirty field is machine dependent (M). In the
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* machine-independent layer, the lock on the object that the
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* page belongs to must be held in order to operate on the field.
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* However, the pmap layer is permitted to set all bits within
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* the field without holding that lock. If the underlying
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* architecture does not support atomic read-modify-write
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* operations on the field's type, then the machine-independent
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* layer uses a 32-bit atomic on the aligned 32-bit word that
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* contains the dirty field. In the machine-independent layer,
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* the implementation of read-modify-write operations on the
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* field is encapsulated in vm_page_clear_dirty_mask().
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*/
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#if PAGE_SIZE == 4096
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#define VM_PAGE_BITS_ALL 0xffu
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typedef uint8_t vm_page_bits_t;
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#elif PAGE_SIZE == 8192
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#define VM_PAGE_BITS_ALL 0xffffu
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typedef uint16_t vm_page_bits_t;
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#elif PAGE_SIZE == 16384
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#define VM_PAGE_BITS_ALL 0xffffffffu
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typedef uint32_t vm_page_bits_t;
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#elif PAGE_SIZE == 32768
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#define VM_PAGE_BITS_ALL 0xfffffffffffffffflu
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typedef uint64_t vm_page_bits_t;
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#endif
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struct vm_page {
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union {
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TAILQ_ENTRY(vm_page) q; /* page queue or free list (Q) */
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struct {
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SLIST_ENTRY(vm_page) ss; /* private slists */
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void *pv;
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} s;
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struct {
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u_long p;
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u_long v;
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} memguard;
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} plinks;
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TAILQ_ENTRY(vm_page) listq; /* pages in same object (O) */
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vm_object_t object; /* which object am I in (O,P) */
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vm_pindex_t pindex; /* offset into object (O,P) */
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vm_paddr_t phys_addr; /* physical address of page */
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struct md_page md; /* machine dependant stuff */
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u_int wire_count; /* wired down maps refs (P) */
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volatile u_int busy_lock; /* busy owners lock */
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uint16_t hold_count; /* page hold count (P) */
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uint16_t flags; /* page PG_* flags (P) */
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uint8_t aflags; /* access is atomic */
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uint8_t oflags; /* page VPO_* flags (O) */
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uint8_t queue; /* page queue index (P,Q) */
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int8_t segind;
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uint8_t order; /* index of the buddy queue */
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uint8_t pool;
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u_char act_count; /* page usage count (P) */
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/* NOTE that these must support one bit per DEV_BSIZE in a page */
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/* so, on normal X86 kernels, they must be at least 8 bits wide */
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vm_page_bits_t valid; /* map of valid DEV_BSIZE chunks (O) */
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vm_page_bits_t dirty; /* map of dirty DEV_BSIZE chunks (M) */
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};
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/*
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* Page flags stored in oflags:
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*
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* Access to these page flags is synchronized by the lock on the object
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* containing the page (O).
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*
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* Note: VPO_UNMANAGED (used by OBJT_DEVICE, OBJT_PHYS and OBJT_SG)
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* indicates that the page is not under PV management but
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* otherwise should be treated as a normal page. Pages not
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* under PV management cannot be paged out via the
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* object/vm_page_t because there is no knowledge of their pte
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* mappings, and such pages are also not on any PQ queue.
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*
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*/
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#define VPO_UNUSED01 0x01 /* --available-- */
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#define VPO_SWAPSLEEP 0x02 /* waiting for swap to finish */
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#define VPO_UNMANAGED 0x04 /* no PV management for page */
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#define VPO_SWAPINPROG 0x08 /* swap I/O in progress on page */
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#define VPO_NOSYNC 0x10 /* do not collect for syncer */
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/*
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* Busy page implementation details.
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* The algorithm is taken mostly by rwlock(9) and sx(9) locks implementation,
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* even if the support for owner identity is removed because of size
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* constraints. Checks on lock recursion are then not possible, while the
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* lock assertions effectiveness is someway reduced.
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*/
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#define VPB_BIT_SHARED 0x01
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#define VPB_BIT_EXCLUSIVE 0x02
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#define VPB_BIT_WAITERS 0x04
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#define VPB_BIT_FLAGMASK \
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(VPB_BIT_SHARED | VPB_BIT_EXCLUSIVE | VPB_BIT_WAITERS)
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#define VPB_SHARERS_SHIFT 3
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#define VPB_SHARERS(x) \
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(((x) & ~VPB_BIT_FLAGMASK) >> VPB_SHARERS_SHIFT)
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#define VPB_SHARERS_WORD(x) ((x) << VPB_SHARERS_SHIFT | VPB_BIT_SHARED)
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#define VPB_ONE_SHARER (1 << VPB_SHARERS_SHIFT)
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#define VPB_SINGLE_EXCLUSIVER VPB_BIT_EXCLUSIVE
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#define VPB_UNBUSIED VPB_SHARERS_WORD(0)
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#define PQ_NONE 255
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#define PQ_INACTIVE 0
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#define PQ_ACTIVE 1
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#define PQ_COUNT 2
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TAILQ_HEAD(pglist, vm_page);
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SLIST_HEAD(spglist, vm_page);
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struct vm_pagequeue {
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struct mtx pq_mutex;
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struct pglist pq_pl;
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int pq_cnt;
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int * const pq_vcnt;
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const char * const pq_name;
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} __aligned(CACHE_LINE_SIZE);
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struct vm_domain {
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struct vm_pagequeue vmd_pagequeues[PQ_COUNT];
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u_int vmd_page_count;
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u_int vmd_free_count;
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long vmd_segs; /* bitmask of the segments */
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boolean_t vmd_oom;
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int vmd_pass; /* local pagedaemon pass */
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struct vm_page vmd_marker; /* marker for pagedaemon private use */
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};
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extern struct vm_domain vm_dom[MAXMEMDOM];
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#define vm_pagequeue_assert_locked(pq) mtx_assert(&(pq)->pq_mutex, MA_OWNED)
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#define vm_pagequeue_lock(pq) mtx_lock(&(pq)->pq_mutex)
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#define vm_pagequeue_unlock(pq) mtx_unlock(&(pq)->pq_mutex)
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#ifdef _KERNEL
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static __inline void
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vm_pagequeue_cnt_add(struct vm_pagequeue *pq, int addend)
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{
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#ifdef notyet
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vm_pagequeue_assert_locked(pq);
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#endif
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pq->pq_cnt += addend;
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atomic_add_int(pq->pq_vcnt, addend);
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}
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#define vm_pagequeue_cnt_inc(pq) vm_pagequeue_cnt_add((pq), 1)
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#define vm_pagequeue_cnt_dec(pq) vm_pagequeue_cnt_add((pq), -1)
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#endif /* _KERNEL */
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extern struct mtx_padalign vm_page_queue_free_mtx;
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extern struct mtx_padalign pa_lock[];
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#if defined(__arm__)
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#define PDRSHIFT PDR_SHIFT
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#elif !defined(PDRSHIFT)
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#define PDRSHIFT 21
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#endif
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#define pa_index(pa) ((pa) >> PDRSHIFT)
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#define PA_LOCKPTR(pa) ((struct mtx *)(&pa_lock[pa_index(pa) % PA_LOCK_COUNT]))
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#define PA_LOCKOBJPTR(pa) ((struct lock_object *)PA_LOCKPTR((pa)))
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#define PA_LOCK(pa) mtx_lock(PA_LOCKPTR(pa))
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#define PA_TRYLOCK(pa) mtx_trylock(PA_LOCKPTR(pa))
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#define PA_UNLOCK(pa) mtx_unlock(PA_LOCKPTR(pa))
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#define PA_UNLOCK_COND(pa) \
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do { \
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if ((pa) != 0) { \
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PA_UNLOCK((pa)); \
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(pa) = 0; \
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} \
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} while (0)
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#define PA_LOCK_ASSERT(pa, a) mtx_assert(PA_LOCKPTR(pa), (a))
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#ifdef KLD_MODULE
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#define vm_page_lock(m) vm_page_lock_KBI((m), LOCK_FILE, LOCK_LINE)
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#define vm_page_unlock(m) vm_page_unlock_KBI((m), LOCK_FILE, LOCK_LINE)
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#define vm_page_trylock(m) vm_page_trylock_KBI((m), LOCK_FILE, LOCK_LINE)
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#else /* !KLD_MODULE */
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#define vm_page_lockptr(m) (PA_LOCKPTR(VM_PAGE_TO_PHYS((m))))
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#define vm_page_lock(m) mtx_lock(vm_page_lockptr((m)))
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#define vm_page_unlock(m) mtx_unlock(vm_page_lockptr((m)))
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#define vm_page_trylock(m) mtx_trylock(vm_page_lockptr((m)))
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#endif
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#if defined(INVARIANTS)
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#define vm_page_assert_locked(m) \
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vm_page_assert_locked_KBI((m), __FILE__, __LINE__)
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#define vm_page_lock_assert(m, a) \
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vm_page_lock_assert_KBI((m), (a), __FILE__, __LINE__)
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#else
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#define vm_page_assert_locked(m)
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#define vm_page_lock_assert(m, a)
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#endif
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/*
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* The vm_page's aflags are updated using atomic operations. To set or clear
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* these flags, the functions vm_page_aflag_set() and vm_page_aflag_clear()
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* must be used. Neither these flags nor these functions are part of the KBI.
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*
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* PGA_REFERENCED may be cleared only if the page is locked. It is set by
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* both the MI and MD VM layers. However, kernel loadable modules should not
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* directly set this flag. They should call vm_page_reference() instead.
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*
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* PGA_WRITEABLE is set exclusively on managed pages by pmap_enter(). When it
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* does so, the page must be exclusive busied. The MI VM layer must never
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* access this flag directly. Instead, it should call
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* pmap_page_is_write_mapped().
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*
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* PGA_EXECUTABLE may be set by pmap routines, and indicates that a page has
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* at least one executable mapping. It is not consumed by the MI VM layer.
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*/
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#define PGA_WRITEABLE 0x01 /* page may be mapped writeable */
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#define PGA_REFERENCED 0x02 /* page has been referenced */
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#define PGA_EXECUTABLE 0x04 /* page may be mapped executable */
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/*
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* Page flags. If changed at any other time than page allocation or
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* freeing, the modification must be protected by the vm_page lock.
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*/
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#define PG_CACHED 0x0001 /* page is cached */
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#define PG_FREE 0x0002 /* page is free */
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#define PG_FICTITIOUS 0x0004 /* physical page doesn't exist */
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#define PG_ZERO 0x0008 /* page is zeroed */
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#define PG_MARKER 0x0010 /* special queue marker page */
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#define PG_WINATCFLS 0x0040 /* flush dirty page on inactive q */
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#define PG_NODUMP 0x0080 /* don't include this page in a dump */
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#define PG_UNHOLDFREE 0x0100 /* delayed free of a held page */
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/*
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* Misc constants.
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*/
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#define ACT_DECLINE 1
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#define ACT_ADVANCE 3
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#define ACT_INIT 5
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#define ACT_MAX 64
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#ifdef _KERNEL
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#include <sys/systm.h>
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#include <machine/atomic.h>
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/*
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* Each pageable resident page falls into one of four lists:
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*
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* free
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* Available for allocation now.
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*
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* cache
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* Almost available for allocation. Still associated with
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* an object, but clean and immediately freeable.
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*
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* The following lists are LRU sorted:
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*
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* inactive
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* Low activity, candidates for reclamation.
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* This is the list of pages that should be
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* paged out next.
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*
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* active
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* Pages that are "active" i.e. they have been
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* recently referenced.
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*
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*/
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extern int vm_page_zero_count;
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extern vm_page_t vm_page_array; /* First resident page in table */
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extern long vm_page_array_size; /* number of vm_page_t's */
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extern long first_page; /* first physical page number */
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#define VM_PAGE_IS_FREE(m) (((m)->flags & PG_FREE) != 0)
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#define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr)
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vm_page_t PHYS_TO_VM_PAGE(vm_paddr_t pa);
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/* page allocation classes: */
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#define VM_ALLOC_NORMAL 0
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#define VM_ALLOC_INTERRUPT 1
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#define VM_ALLOC_SYSTEM 2
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#define VM_ALLOC_CLASS_MASK 3
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/* page allocation flags: */
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#define VM_ALLOC_WIRED 0x0020 /* non pageable */
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#define VM_ALLOC_ZERO 0x0040 /* Try to obtain a zeroed page */
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#define VM_ALLOC_NOOBJ 0x0100 /* No associated object */
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#define VM_ALLOC_NOBUSY 0x0200 /* Do not busy the page */
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#define VM_ALLOC_IFCACHED 0x0400 /* Fail if the page is not cached */
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#define VM_ALLOC_IFNOTCACHED 0x0800 /* Fail if the page is cached */
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#define VM_ALLOC_IGN_SBUSY 0x1000 /* vm_page_grab() only */
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#define VM_ALLOC_NODUMP 0x2000 /* don't include in dump */
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#define VM_ALLOC_SBUSY 0x4000 /* Shared busy the page */
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#define VM_ALLOC_COUNT_SHIFT 16
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#define VM_ALLOC_COUNT(count) ((count) << VM_ALLOC_COUNT_SHIFT)
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#ifdef M_NOWAIT
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static inline int
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malloc2vm_flags(int malloc_flags)
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{
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int pflags;
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KASSERT((malloc_flags & M_USE_RESERVE) == 0 ||
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(malloc_flags & M_NOWAIT) != 0,
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("M_USE_RESERVE requires M_NOWAIT"));
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pflags = (malloc_flags & M_USE_RESERVE) != 0 ? VM_ALLOC_INTERRUPT :
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VM_ALLOC_SYSTEM;
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if ((malloc_flags & M_ZERO) != 0)
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pflags |= VM_ALLOC_ZERO;
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if ((malloc_flags & M_NODUMP) != 0)
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pflags |= VM_ALLOC_NODUMP;
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return (pflags);
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}
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#endif
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void vm_page_busy_downgrade(vm_page_t m);
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void vm_page_busy_sleep(vm_page_t m, const char *msg);
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void vm_page_flash(vm_page_t m);
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void vm_page_hold(vm_page_t mem);
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void vm_page_unhold(vm_page_t mem);
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void vm_page_free(vm_page_t m);
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void vm_page_free_zero(vm_page_t m);
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void vm_page_activate (vm_page_t);
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void vm_page_advise(vm_page_t m, int advice);
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vm_page_t vm_page_alloc (vm_object_t, vm_pindex_t, int);
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vm_page_t vm_page_alloc_contig(vm_object_t object, vm_pindex_t pindex, int req,
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u_long npages, vm_paddr_t low, vm_paddr_t high, u_long alignment,
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vm_paddr_t boundary, vm_memattr_t memattr);
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vm_page_t vm_page_alloc_freelist(int, int);
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vm_page_t vm_page_grab (vm_object_t, vm_pindex_t, int);
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void vm_page_cache(vm_page_t);
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void vm_page_cache_free(vm_object_t, vm_pindex_t, vm_pindex_t);
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void vm_page_cache_transfer(vm_object_t, vm_pindex_t, vm_object_t);
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int vm_page_try_to_cache (vm_page_t);
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int vm_page_try_to_free (vm_page_t);
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void vm_page_deactivate (vm_page_t);
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void vm_page_dequeue(vm_page_t m);
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void vm_page_dequeue_locked(vm_page_t m);
|
|
vm_page_t vm_page_find_least(vm_object_t, vm_pindex_t);
|
|
vm_page_t vm_page_getfake(vm_paddr_t paddr, vm_memattr_t memattr);
|
|
void vm_page_initfake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr);
|
|
int vm_page_insert (vm_page_t, vm_object_t, vm_pindex_t);
|
|
boolean_t vm_page_is_cached(vm_object_t object, vm_pindex_t pindex);
|
|
vm_page_t vm_page_lookup (vm_object_t, vm_pindex_t);
|
|
vm_page_t vm_page_next(vm_page_t m);
|
|
int vm_page_pa_tryrelock(pmap_t, vm_paddr_t, vm_paddr_t *);
|
|
struct vm_pagequeue *vm_page_pagequeue(vm_page_t m);
|
|
vm_page_t vm_page_prev(vm_page_t m);
|
|
void vm_page_putfake(vm_page_t m);
|
|
void vm_page_readahead_finish(vm_page_t m);
|
|
void vm_page_reference(vm_page_t m);
|
|
void vm_page_remove (vm_page_t);
|
|
int vm_page_rename (vm_page_t, vm_object_t, vm_pindex_t);
|
|
vm_page_t vm_page_replace(vm_page_t mnew, vm_object_t object,
|
|
vm_pindex_t pindex);
|
|
void vm_page_requeue(vm_page_t m);
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|
void vm_page_requeue_locked(vm_page_t m);
|
|
int vm_page_sbusied(vm_page_t m);
|
|
void vm_page_set_valid_range(vm_page_t m, int base, int size);
|
|
int vm_page_sleep_if_busy(vm_page_t m, const char *msg);
|
|
vm_offset_t vm_page_startup(vm_offset_t vaddr);
|
|
void vm_page_sunbusy(vm_page_t m);
|
|
int vm_page_trysbusy(vm_page_t m);
|
|
void vm_page_unhold_pages(vm_page_t *ma, int count);
|
|
void vm_page_unwire (vm_page_t, int);
|
|
void vm_page_updatefake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr);
|
|
void vm_page_wire (vm_page_t);
|
|
void vm_page_xunbusy_hard(vm_page_t m);
|
|
void vm_page_set_validclean (vm_page_t, int, int);
|
|
void vm_page_clear_dirty (vm_page_t, int, int);
|
|
void vm_page_set_invalid (vm_page_t, int, int);
|
|
int vm_page_is_valid (vm_page_t, int, int);
|
|
void vm_page_test_dirty (vm_page_t);
|
|
vm_page_bits_t vm_page_bits(int base, int size);
|
|
void vm_page_zero_invalid(vm_page_t m, boolean_t setvalid);
|
|
void vm_page_free_toq(vm_page_t m);
|
|
void vm_page_zero_idle_wakeup(void);
|
|
|
|
void vm_page_dirty_KBI(vm_page_t m);
|
|
void vm_page_lock_KBI(vm_page_t m, const char *file, int line);
|
|
void vm_page_unlock_KBI(vm_page_t m, const char *file, int line);
|
|
int vm_page_trylock_KBI(vm_page_t m, const char *file, int line);
|
|
#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
|
|
void vm_page_assert_locked_KBI(vm_page_t m, const char *file, int line);
|
|
void vm_page_lock_assert_KBI(vm_page_t m, int a, const char *file, int line);
|
|
#endif
|
|
|
|
#define vm_page_assert_sbusied(m) \
|
|
KASSERT(vm_page_sbusied(m), \
|
|
("vm_page_assert_sbusied: page %p not shared busy @ %s:%d", \
|
|
(void *)m, __FILE__, __LINE__));
|
|
|
|
#define vm_page_assert_unbusied(m) \
|
|
KASSERT(!vm_page_busied(m), \
|
|
("vm_page_assert_unbusied: page %p busy @ %s:%d", \
|
|
(void *)m, __FILE__, __LINE__));
|
|
|
|
#define vm_page_assert_xbusied(m) \
|
|
KASSERT(vm_page_xbusied(m), \
|
|
("vm_page_assert_xbusied: page %p not exclusive busy @ %s:%d", \
|
|
(void *)m, __FILE__, __LINE__));
|
|
|
|
#define vm_page_busied(m) \
|
|
((m)->busy_lock != VPB_UNBUSIED)
|
|
|
|
#define vm_page_sbusy(m) do { \
|
|
if (!vm_page_trysbusy(m)) \
|
|
panic("%s: page %p failed shared busing", __func__, m); \
|
|
} while (0)
|
|
|
|
#define vm_page_tryxbusy(m) \
|
|
(atomic_cmpset_acq_int(&m->busy_lock, VPB_UNBUSIED, \
|
|
VPB_SINGLE_EXCLUSIVER))
|
|
|
|
#define vm_page_xbusied(m) \
|
|
((m->busy_lock & VPB_SINGLE_EXCLUSIVER) != 0)
|
|
|
|
#define vm_page_xbusy(m) do { \
|
|
if (!vm_page_tryxbusy(m)) \
|
|
panic("%s: page %p failed exclusive busing", __func__, \
|
|
m); \
|
|
} while (0)
|
|
|
|
#define vm_page_xunbusy(m) do { \
|
|
if (!atomic_cmpset_rel_int(&(m)->busy_lock, \
|
|
VPB_SINGLE_EXCLUSIVER, VPB_UNBUSIED)) \
|
|
vm_page_xunbusy_hard(m); \
|
|
} while (0)
|
|
|
|
#ifdef INVARIANTS
|
|
void vm_page_object_lock_assert(vm_page_t m);
|
|
#define VM_PAGE_OBJECT_LOCK_ASSERT(m) vm_page_object_lock_assert(m)
|
|
#else
|
|
#define VM_PAGE_OBJECT_LOCK_ASSERT(m) (void)0
|
|
#endif
|
|
|
|
/*
|
|
* We want to use atomic updates for the aflags field, which is 8 bits wide.
|
|
* However, not all architectures support atomic operations on 8-bit
|
|
* destinations. In order that we can easily use a 32-bit operation, we
|
|
* require that the aflags field be 32-bit aligned.
|
|
*/
|
|
CTASSERT(offsetof(struct vm_page, aflags) % sizeof(uint32_t) == 0);
|
|
|
|
/*
|
|
* Clear the given bits in the specified page.
|
|
*/
|
|
static inline void
|
|
vm_page_aflag_clear(vm_page_t m, uint8_t bits)
|
|
{
|
|
uint32_t *addr, val;
|
|
|
|
/*
|
|
* The PGA_REFERENCED flag can only be cleared if the page is locked.
|
|
*/
|
|
if ((bits & PGA_REFERENCED) != 0)
|
|
vm_page_assert_locked(m);
|
|
|
|
/*
|
|
* Access the whole 32-bit word containing the aflags field with an
|
|
* atomic update. Parallel non-atomic updates to the other fields
|
|
* within this word are handled properly by the atomic update.
|
|
*/
|
|
addr = (void *)&m->aflags;
|
|
KASSERT(((uintptr_t)addr & (sizeof(uint32_t) - 1)) == 0,
|
|
("vm_page_aflag_clear: aflags is misaligned"));
|
|
val = bits;
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
val <<= 24;
|
|
#endif
|
|
atomic_clear_32(addr, val);
|
|
}
|
|
|
|
/*
|
|
* Set the given bits in the specified page.
|
|
*/
|
|
static inline void
|
|
vm_page_aflag_set(vm_page_t m, uint8_t bits)
|
|
{
|
|
uint32_t *addr, val;
|
|
|
|
/*
|
|
* The PGA_WRITEABLE flag can only be set if the page is managed and
|
|
* exclusive busied. Currently, this flag is only set by pmap_enter().
|
|
*/
|
|
KASSERT((bits & PGA_WRITEABLE) == 0 ||
|
|
((m->oflags & VPO_UNMANAGED) == 0 && vm_page_xbusied(m)),
|
|
("vm_page_aflag_set: PGA_WRITEABLE and not exclusive busy"));
|
|
|
|
/*
|
|
* Access the whole 32-bit word containing the aflags field with an
|
|
* atomic update. Parallel non-atomic updates to the other fields
|
|
* within this word are handled properly by the atomic update.
|
|
*/
|
|
addr = (void *)&m->aflags;
|
|
KASSERT(((uintptr_t)addr & (sizeof(uint32_t) - 1)) == 0,
|
|
("vm_page_aflag_set: aflags is misaligned"));
|
|
val = bits;
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
val <<= 24;
|
|
#endif
|
|
atomic_set_32(addr, val);
|
|
}
|
|
|
|
/*
|
|
* vm_page_dirty:
|
|
*
|
|
* Set all bits in the page's dirty field.
|
|
*
|
|
* The object containing the specified page must be locked if the
|
|
* call is made from the machine-independent layer.
|
|
*
|
|
* See vm_page_clear_dirty_mask().
|
|
*/
|
|
static __inline void
|
|
vm_page_dirty(vm_page_t m)
|
|
{
|
|
|
|
/* Use vm_page_dirty_KBI() under INVARIANTS to save memory. */
|
|
#if defined(KLD_MODULE) || defined(INVARIANTS)
|
|
vm_page_dirty_KBI(m);
|
|
#else
|
|
m->dirty = VM_PAGE_BITS_ALL;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* vm_page_remque:
|
|
*
|
|
* If the given page is in a page queue, then remove it from that page
|
|
* queue.
|
|
*
|
|
* The page must be locked.
|
|
*/
|
|
static inline void
|
|
vm_page_remque(vm_page_t m)
|
|
{
|
|
|
|
if (m->queue != PQ_NONE)
|
|
vm_page_dequeue(m);
|
|
}
|
|
|
|
/*
|
|
* vm_page_undirty:
|
|
*
|
|
* Set page to not be dirty. Note: does not clear pmap modify bits
|
|
*/
|
|
static __inline void
|
|
vm_page_undirty(vm_page_t m)
|
|
{
|
|
|
|
VM_PAGE_OBJECT_LOCK_ASSERT(m);
|
|
m->dirty = 0;
|
|
}
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* !_VM_PAGE_ */
|