352 lines
12 KiB
C
352 lines
12 KiB
C
/* $NetBSD: uvm_map.h,v 1.80 2020/05/26 00:50:53 kamil Exp $ */
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/*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* Copyright (c) 1991, 1993, The Regents of the University of California.
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*
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* 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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* 3. 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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* @(#)vm_map.h 8.3 (Berkeley) 3/15/94
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* from: Id: uvm_map.h,v 1.1.2.3 1998/02/07 01:16:55 chs Exp
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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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* 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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#ifndef _UVM_UVM_MAP_H_
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#define _UVM_UVM_MAP_H_
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/*
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* uvm_map.h
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*/
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#ifdef _KERNEL
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/*
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* macros
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*/
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/*
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* UVM_MAP_CLIP_START: ensure that the entry begins at or after
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* the starting address, if it doesn't we split the entry.
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*
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* => map must be locked by caller
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*/
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#define UVM_MAP_CLIP_START(MAP,ENTRY,VA) { \
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if ((VA) > (ENTRY)->start && (VA) < (ENTRY)->end) { \
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uvm_map_clip_start(MAP,ENTRY,VA); \
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} \
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}
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/*
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* UVM_MAP_CLIP_END: ensure that the entry ends at or before
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* the ending address, if it does't we split the entry.
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*
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* => map must be locked by caller
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*/
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#define UVM_MAP_CLIP_END(MAP,ENTRY,VA) { \
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if ((VA) > (ENTRY)->start && (VA) < (ENTRY)->end) { \
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uvm_map_clip_end(MAP,ENTRY,VA); \
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} \
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}
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/*
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* extract flags
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*/
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#define UVM_EXTRACT_REMOVE 0x01 /* remove mapping from old map */
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#define UVM_EXTRACT_CONTIG 0x02 /* try to keep it contig */
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#define UVM_EXTRACT_QREF 0x04 /* use quick refs */
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#define UVM_EXTRACT_FIXPROT 0x08 /* set prot to maxprot as we go */
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#define UVM_EXTRACT_RESERVED 0x10 /* caller did uvm_map_reserve() */
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#define UVM_EXTRACT_PROT_ALL 0x20 /* set prot to UVM_PROT_ALL */
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#endif /* _KERNEL */
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#include <sys/rbtree.h>
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#include <sys/pool.h>
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#include <sys/rwlock.h>
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#include <sys/mutex.h>
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#include <sys/condvar.h>
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#include <uvm/uvm_anon.h>
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/*
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* Address map entries consist of start and end addresses,
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* a VM object (or sharing map) and offset into that object,
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* and user-exported inheritance and protection information.
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* Also included is control information for virtual copy operations.
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*
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* At runtime this is aligned on a cacheline boundary, with fields
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* used during fault processing to do RB tree lookup clustered at
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* the beginning.
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*/
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struct vm_map_entry {
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struct rb_node rb_node; /* tree information */
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vaddr_t start; /* start address */
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vaddr_t end; /* end address */
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vsize_t gap; /* free space after */
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vsize_t maxgap; /* space in subtree */
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struct vm_map_entry *prev; /* previous entry */
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struct vm_map_entry *next; /* next entry */
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union {
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struct uvm_object *uvm_obj; /* uvm object */
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struct vm_map *sub_map; /* belongs to another map */
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} object; /* object I point to */
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voff_t offset; /* offset into object */
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uint8_t etype; /* entry type */
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uint8_t flags; /* flags */
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uint8_t advice; /* madvise advice */
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uint8_t unused; /* unused */
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vm_prot_t protection; /* protection code */
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vm_prot_t max_protection; /* maximum protection */
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vm_inherit_t inheritance; /* inheritance */
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int wired_count; /* can be paged if == 0 */
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struct vm_aref aref; /* anonymous overlay */
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};
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/* flags */
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#define UVM_MAP_KERNEL 0x01 /* kernel map entry */
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#define UVM_MAP_STATIC 0x04 /* special static entries */
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#define UVM_MAP_NOMERGE 0x08 /* this entry is not mergable */
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#define VM_MAPENT_ISWIRED(entry) ((entry)->wired_count != 0)
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/*
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* Maps are doubly-linked lists of map entries, kept sorted
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* by address. A single hint is provided to start
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* searches again from the last successful search,
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* insertion, or removal.
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*
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* LOCKING PROTOCOL NOTES:
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* -----------------------
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*
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* VM map locking is a little complicated. There are both shared
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* and exclusive locks on maps. However, it is sometimes required
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* to downgrade an exclusive lock to a shared lock, and upgrade to
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* an exclusive lock again (to perform error recovery). However,
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* another thread *must not* queue itself to receive an exclusive
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* lock while before we upgrade back to exclusive, otherwise the
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* error recovery becomes extremely difficult, if not impossible.
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*
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* In order to prevent this scenario, we introduce the notion of
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* a `busy' map. A `busy' map is read-locked, but other threads
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* attempting to write-lock wait for this flag to clear before
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* entering the lock manager. A map may only be marked busy
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* when the map is write-locked (and then the map must be downgraded
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* to read-locked), and may only be marked unbusy by the thread
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* which marked it busy (holding *either* a read-lock or a
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* write-lock, the latter being gained by an upgrade).
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*
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* Access to the map `flags' member is controlled by the `flags_lock'
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* simple lock. Note that some flags are static (set once at map
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* creation time, and never changed), and thus require no locking
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* to check those flags. All flags which are r/w must be set or
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* cleared while the `flags_lock' is asserted. Additional locking
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* requirements are:
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*
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* VM_MAP_PAGEABLE r/o static flag; no locking required
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*
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* VM_MAP_WIREFUTURE r/w; may only be set or cleared when
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* map is write-locked. may be tested
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* without asserting `flags_lock'.
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*
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* VM_MAP_DYING r/o; set when a vmspace is being
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* destroyed to indicate that updates
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* to the pmap can be skipped.
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*
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* VM_MAP_TOPDOWN r/o; set when the vmspace is
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* created if the unspecified map
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* allocations are to be arranged in
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* a "top down" manner.
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*/
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struct vm_map {
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struct pmap * pmap; /* Physical map */
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krwlock_t lock; /* Non-intrsafe lock */
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struct lwp * busy; /* LWP holding map busy */
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kmutex_t misc_lock; /* Lock for cv, busy */
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kcondvar_t cv; /* For signalling */
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int flags; /* flags */
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struct rb_tree rb_tree; /* Tree for entries */
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struct vm_map_entry header; /* List of entries */
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int nentries; /* Number of entries */
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vsize_t size; /* virtual size */
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volatile int ref_count; /* Reference count */
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struct vm_map_entry * hint; /* hint for quick lookups */
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struct vm_map_entry * first_free; /* First free space hint */
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unsigned int timestamp; /* Version number */
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};
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#if defined(_KERNEL)
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#include <sys/callback.h>
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#endif /* defined(_KERNEL) */
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#define VM_MAP_IS_KERNEL(map) (vm_map_pmap(map) == pmap_kernel())
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/* vm_map flags */
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#define VM_MAP_PAGEABLE 0x01 /* ro: entries are pageable */
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#define VM_MAP_WIREFUTURE 0x04 /* rw: wire future mappings */
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#define VM_MAP_DYING 0x20 /* rw: map is being destroyed */
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#define VM_MAP_TOPDOWN 0x40 /* ro: arrange map top-down */
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#define VM_MAP_WANTVA 0x100 /* rw: want va */
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#define VM_MAP_BITS "\177\020\
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b\0PAGEABLE\0\
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b\2WIREFUTURE\0\
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b\5DYING\0\
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b\6TOPDOWN\0\
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b\10WANTVA\0"
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#ifdef _KERNEL
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struct uvm_map_args {
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struct vm_map_entry *uma_prev;
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vaddr_t uma_start;
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vsize_t uma_size;
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struct uvm_object *uma_uobj;
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voff_t uma_uoffset;
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uvm_flag_t uma_flags;
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};
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#endif /* _KERNEL */
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/*
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* globals:
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*/
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#ifdef _KERNEL
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#include <sys/proc.h>
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#ifdef PMAP_GROWKERNEL
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extern vaddr_t uvm_maxkaddr;
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#endif
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/*
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* protos: the following prototypes define the interface to vm_map
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*/
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void uvm_map_deallocate(struct vm_map *);
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int uvm_map_willneed(struct vm_map *, vaddr_t, vaddr_t);
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int uvm_map_clean(struct vm_map *, vaddr_t, vaddr_t, int);
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void uvm_map_clip_start(struct vm_map *, struct vm_map_entry *,
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vaddr_t);
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void uvm_map_clip_end(struct vm_map *, struct vm_map_entry *,
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vaddr_t);
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int uvm_map_extract(struct vm_map *, vaddr_t, vsize_t,
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struct vm_map *, vaddr_t *, int);
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struct vm_map_entry *
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uvm_map_findspace(struct vm_map *, vaddr_t, vsize_t,
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vaddr_t *, struct uvm_object *, voff_t, vsize_t, int);
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int uvm_map_inherit(struct vm_map *, vaddr_t, vaddr_t,
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vm_inherit_t);
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int uvm_map_advice(struct vm_map *, vaddr_t, vaddr_t, int);
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void uvm_map_init(void);
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void uvm_map_init_caches(void);
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bool uvm_map_lookup_entry(struct vm_map *, vaddr_t,
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struct vm_map_entry **);
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void uvm_map_reference(struct vm_map *);
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int uvm_map_reserve(struct vm_map *, vsize_t, vaddr_t, vsize_t,
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vaddr_t *, uvm_flag_t);
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void uvm_map_setup(struct vm_map *, vaddr_t, vaddr_t, int);
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int uvm_map_submap(struct vm_map *, vaddr_t, vaddr_t,
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struct vm_map *);
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void uvm_unmap1(struct vm_map *, vaddr_t, vaddr_t, int);
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#define uvm_unmap(map, s, e) uvm_unmap1((map), (s), (e), 0)
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void uvm_unmap_detach(struct vm_map_entry *,int);
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void uvm_unmap_remove(struct vm_map *, vaddr_t, vaddr_t,
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struct vm_map_entry **, int);
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int uvm_map_prepare(struct vm_map *, vaddr_t, vsize_t,
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struct uvm_object *, voff_t, vsize_t, uvm_flag_t,
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struct uvm_map_args *);
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int uvm_map_enter(struct vm_map *, const struct uvm_map_args *,
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struct vm_map_entry *);
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int uvm_mapent_trymerge(struct vm_map *,
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struct vm_map_entry *, int);
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#define UVM_MERGE_COPYING 1
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/*
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* VM map locking operations.
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*/
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bool vm_map_lock_try(struct vm_map *);
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void vm_map_lock(struct vm_map *);
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void vm_map_unlock(struct vm_map *);
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void vm_map_unbusy(struct vm_map *);
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void vm_map_lock_read(struct vm_map *);
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void vm_map_unlock_read(struct vm_map *);
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void vm_map_busy(struct vm_map *);
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bool vm_map_locked_p(struct vm_map *);
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void uvm_map_lock_entry(struct vm_map_entry *, krw_t);
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void uvm_map_unlock_entry(struct vm_map_entry *);
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#endif /* _KERNEL */
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/*
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* Functions implemented as macros
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*/
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#define vm_map_min(map) ((map)->header.end)
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#define vm_map_max(map) ((map)->header.start)
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#define vm_map_setmin(map, v) ((map)->header.end = (v))
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#define vm_map_setmax(map, v) ((map)->header.start = (v))
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#define vm_map_pmap(map) ((map)->pmap)
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#endif /* _UVM_UVM_MAP_H_ */
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