544 lines
19 KiB
C
544 lines
19 KiB
C
/*-
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* SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
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*
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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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* 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 8.9 (Berkeley) 5/17/95
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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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/*
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* Virtual memory map module definitions.
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*/
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#ifndef _VM_MAP_
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#define _VM_MAP_
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#include <sys/lock.h>
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#include <sys/sx.h>
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#include <sys/_mutex.h>
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/*
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* Types defined:
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*
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* vm_map_t the high-level address map data structure.
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* vm_map_entry_t an entry in an address map.
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*/
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typedef u_char vm_flags_t;
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typedef u_int vm_eflags_t;
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/*
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* Objects which live in maps may be either VM objects, or
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* another map (called a "sharing map") which denotes read-write
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* sharing with other maps.
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*/
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union vm_map_object {
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struct vm_object *vm_object; /* object object */
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struct vm_map *sub_map; /* belongs to another map */
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};
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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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* For stack gap map entries (MAP_ENTRY_GUARD | MAP_ENTRY_GROWS_DOWN
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* or UP), the next_read member is reused as the stack_guard_page
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* storage, and offset is the stack protection.
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*/
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struct vm_map_entry {
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struct vm_map_entry *left; /* left child or previous entry */
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struct vm_map_entry *right; /* right child or next entry */
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vm_offset_t start; /* start address */
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vm_offset_t end; /* end address */
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vm_offset_t next_read; /* vaddr of the next sequential read */
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vm_size_t max_free; /* max free space in subtree */
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union vm_map_object object; /* object I point to */
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vm_ooffset_t offset; /* offset into object */
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vm_eflags_t eflags; /* map entry flags */
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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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uint8_t read_ahead; /* pages in the read-ahead window */
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int wired_count; /* can be paged if = 0 */
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struct ucred *cred; /* tmp storage for creator ref */
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struct thread *wiring_thread;
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};
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#define MAP_ENTRY_NOSYNC 0x00000001
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#define MAP_ENTRY_IS_SUB_MAP 0x00000002
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#define MAP_ENTRY_COW 0x00000004
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#define MAP_ENTRY_NEEDS_COPY 0x00000008
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#define MAP_ENTRY_NOFAULT 0x00000010
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#define MAP_ENTRY_USER_WIRED 0x00000020
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#define MAP_ENTRY_BEHAV_NORMAL 0x00000000 /* default behavior */
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#define MAP_ENTRY_BEHAV_SEQUENTIAL 0x00000040 /* expect sequential
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access */
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#define MAP_ENTRY_BEHAV_RANDOM 0x00000080 /* expect random
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access */
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#define MAP_ENTRY_BEHAV_RESERVED 0x000000c0 /* future use */
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#define MAP_ENTRY_BEHAV_MASK 0x000000c0
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#define MAP_ENTRY_IN_TRANSITION 0x00000100 /* entry being
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changed */
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#define MAP_ENTRY_NEEDS_WAKEUP 0x00000200 /* waiters in
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transition */
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#define MAP_ENTRY_NOCOREDUMP 0x00000400 /* don't include in
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a core */
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#define MAP_ENTRY_VN_EXEC 0x00000800 /* text vnode mapping */
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#define MAP_ENTRY_GROWS_DOWN 0x00001000 /* top-down stacks */
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#define MAP_ENTRY_GROWS_UP 0x00002000 /* bottom-up stacks */
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#define MAP_ENTRY_WIRE_SKIPPED 0x00004000
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#define MAP_ENTRY_WRITECNT 0x00008000 /* tracked writeable
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mapping */
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#define MAP_ENTRY_GUARD 0x00010000
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#define MAP_ENTRY_STACK_GAP_DN 0x00020000
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#define MAP_ENTRY_STACK_GAP_UP 0x00040000
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#define MAP_ENTRY_HEADER 0x00080000
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#define MAP_ENTRY_SPLIT_BOUNDARY_MASK 0x00300000
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#define MAP_ENTRY_SPLIT_BOUNDARY_SHIFT 20
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#define MAP_ENTRY_SPLIT_BOUNDARY_INDEX(entry) \
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(((entry)->eflags & MAP_ENTRY_SPLIT_BOUNDARY_MASK) >> \
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MAP_ENTRY_SPLIT_BOUNDARY_SHIFT)
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#ifdef _KERNEL
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static __inline u_char
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vm_map_entry_behavior(vm_map_entry_t entry)
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{
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return (entry->eflags & MAP_ENTRY_BEHAV_MASK);
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}
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static __inline int
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vm_map_entry_user_wired_count(vm_map_entry_t entry)
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{
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if (entry->eflags & MAP_ENTRY_USER_WIRED)
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return (1);
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return (0);
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}
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static __inline int
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vm_map_entry_system_wired_count(vm_map_entry_t entry)
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{
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return (entry->wired_count - vm_map_entry_user_wired_count(entry));
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}
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#endif /* _KERNEL */
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/*
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* A map is a set of map entries. These map entries are
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* organized as a threaded binary search tree. The tree is
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* ordered based upon the start and end addresses contained
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* within each map entry. The largest gap between an entry in a
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* subtree and one of its neighbors is saved in the max_free
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* field, and that field is updated when the tree is restructured.
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*
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* Sleator and Tarjan's top-down splay algorithm is employed to
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* control height imbalance in the binary search tree.
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*
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* The map's min offset value is stored in map->header.end, and
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* its max offset value is stored in map->header.start. These
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* values act as sentinels for any forward or backward address
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* scan of the list. The right and left fields of the map
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* header point to the first and list map entries. The map
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* header has a special value for the eflags field,
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* MAP_ENTRY_HEADER, that is set initially, is never changed,
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* and prevents an eflags match of the header with any other map
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* entry.
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*
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* List of locks
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* (c) const until freed
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*/
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struct vm_map {
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struct vm_map_entry header; /* List of entries */
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struct sx lock; /* Lock for map data */
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struct mtx system_mtx;
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int nentries; /* Number of entries */
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vm_size_t size; /* virtual size */
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u_int timestamp; /* Version number */
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u_char needs_wakeup;
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u_char system_map; /* (c) Am I a system map? */
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vm_flags_t flags; /* flags for this vm_map */
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vm_map_entry_t root; /* Root of a binary search tree */
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pmap_t pmap; /* (c) Physical map */
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vm_offset_t anon_loc;
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int busy;
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#ifdef DIAGNOSTIC
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int nupdates;
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#endif
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};
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/*
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* vm_flags_t values
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*/
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#define MAP_WIREFUTURE 0x01 /* wire all future pages */
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#define MAP_BUSY_WAKEUP 0x02 /* thread(s) waiting on busy state */
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#define MAP_IS_SUB_MAP 0x04 /* has parent */
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#define MAP_ASLR 0x08 /* enabled ASLR */
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#define MAP_ASLR_IGNSTART 0x10 /* ASLR ignores data segment */
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#define MAP_REPLENISH 0x20 /* kmapent zone needs to be refilled */
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#define MAP_WXORX 0x40 /* enforce W^X */
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#define MAP_ASLR_STACK 0x80 /* stack location is randomized */
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#ifdef _KERNEL
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#if defined(KLD_MODULE) && !defined(KLD_TIED)
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#define vm_map_max(map) vm_map_max_KBI((map))
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#define vm_map_min(map) vm_map_min_KBI((map))
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#define vm_map_pmap(map) vm_map_pmap_KBI((map))
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#define vm_map_range_valid(map, start, end) \
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vm_map_range_valid_KBI((map), (start), (end))
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#else
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static __inline vm_offset_t
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vm_map_max(const struct vm_map *map)
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{
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return (map->header.start);
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}
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static __inline vm_offset_t
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vm_map_min(const struct vm_map *map)
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{
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return (map->header.end);
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}
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static __inline pmap_t
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vm_map_pmap(vm_map_t map)
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{
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return (map->pmap);
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}
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static __inline void
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vm_map_modflags(vm_map_t map, vm_flags_t set, vm_flags_t clear)
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{
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map->flags = (map->flags | set) & ~clear;
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}
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static inline bool
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vm_map_range_valid(vm_map_t map, vm_offset_t start, vm_offset_t end)
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{
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if (end < start)
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return (false);
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if (start < vm_map_min(map) || end > vm_map_max(map))
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return (false);
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return (true);
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}
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#endif /* KLD_MODULE */
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#endif /* _KERNEL */
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/*
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* Shareable process virtual address space.
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*
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* List of locks
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* (c) const until freed
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*/
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struct vmspace {
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struct vm_map vm_map; /* VM address map */
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struct shmmap_state *vm_shm; /* SYS5 shared memory private data XXX */
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segsz_t vm_swrss; /* resident set size before last swap */
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segsz_t vm_tsize; /* text size (pages) XXX */
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segsz_t vm_dsize; /* data size (pages) XXX */
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segsz_t vm_ssize; /* stack size (pages) */
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caddr_t vm_taddr; /* (c) user virtual address of text */
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caddr_t vm_daddr; /* (c) user virtual address of data */
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caddr_t vm_maxsaddr; /* user VA at max stack growth */
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vm_offset_t vm_stacktop; /* top of the stack, may not be page-aligned */
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vm_offset_t vm_shp_base; /* shared page address */
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u_int vm_refcnt; /* number of references */
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/*
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* Keep the PMAP last, so that CPU-specific variations of that
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* structure on a single architecture don't result in offset
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* variations of the machine-independent fields in the vmspace.
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*/
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struct pmap vm_pmap; /* private physical map */
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};
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#ifdef _KERNEL
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static __inline pmap_t
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vmspace_pmap(struct vmspace *vmspace)
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{
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return &vmspace->vm_pmap;
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}
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#endif /* _KERNEL */
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#ifdef _KERNEL
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/*
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* Macros: vm_map_lock, etc.
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* Function:
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* Perform locking on the data portion of a map. Note that
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* these macros mimic procedure calls returning void. The
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* semicolon is supplied by the user of these macros, not
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* by the macros themselves. The macros can safely be used
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* as unbraced elements in a higher level statement.
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*/
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void _vm_map_lock(vm_map_t map, const char *file, int line);
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void _vm_map_unlock(vm_map_t map, const char *file, int line);
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int _vm_map_unlock_and_wait(vm_map_t map, int timo, const char *file, int line);
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void _vm_map_lock_read(vm_map_t map, const char *file, int line);
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void _vm_map_unlock_read(vm_map_t map, const char *file, int line);
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int _vm_map_trylock(vm_map_t map, const char *file, int line);
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int _vm_map_trylock_read(vm_map_t map, const char *file, int line);
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int _vm_map_lock_upgrade(vm_map_t map, const char *file, int line);
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void _vm_map_lock_downgrade(vm_map_t map, const char *file, int line);
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int vm_map_locked(vm_map_t map);
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void vm_map_wakeup(vm_map_t map);
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void vm_map_busy(vm_map_t map);
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void vm_map_unbusy(vm_map_t map);
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void vm_map_wait_busy(vm_map_t map);
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vm_offset_t vm_map_max_KBI(const struct vm_map *map);
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vm_offset_t vm_map_min_KBI(const struct vm_map *map);
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pmap_t vm_map_pmap_KBI(vm_map_t map);
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bool vm_map_range_valid_KBI(vm_map_t map, vm_offset_t start, vm_offset_t end);
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#define vm_map_lock(map) _vm_map_lock(map, LOCK_FILE, LOCK_LINE)
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#define vm_map_unlock(map) _vm_map_unlock(map, LOCK_FILE, LOCK_LINE)
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#define vm_map_unlock_and_wait(map, timo) \
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_vm_map_unlock_and_wait(map, timo, LOCK_FILE, LOCK_LINE)
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#define vm_map_lock_read(map) _vm_map_lock_read(map, LOCK_FILE, LOCK_LINE)
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#define vm_map_unlock_read(map) _vm_map_unlock_read(map, LOCK_FILE, LOCK_LINE)
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#define vm_map_trylock(map) _vm_map_trylock(map, LOCK_FILE, LOCK_LINE)
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#define vm_map_trylock_read(map) \
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_vm_map_trylock_read(map, LOCK_FILE, LOCK_LINE)
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#define vm_map_lock_upgrade(map) \
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_vm_map_lock_upgrade(map, LOCK_FILE, LOCK_LINE)
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#define vm_map_lock_downgrade(map) \
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_vm_map_lock_downgrade(map, LOCK_FILE, LOCK_LINE)
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long vmspace_resident_count(struct vmspace *vmspace);
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#endif /* _KERNEL */
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/*
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* Copy-on-write flags for vm_map operations
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*/
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#define MAP_INHERIT_SHARE 0x00000001
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#define MAP_COPY_ON_WRITE 0x00000002
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#define MAP_NOFAULT 0x00000004
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#define MAP_PREFAULT 0x00000008
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#define MAP_PREFAULT_PARTIAL 0x00000010
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#define MAP_DISABLE_SYNCER 0x00000020
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#define MAP_CHECK_EXCL 0x00000040
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#define MAP_CREATE_GUARD 0x00000080
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#define MAP_DISABLE_COREDUMP 0x00000100
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#define MAP_PREFAULT_MADVISE 0x00000200 /* from (user) madvise request */
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#define MAP_WRITECOUNT 0x00000400
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#define MAP_REMAP 0x00000800
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#define MAP_STACK_GROWS_DOWN 0x00001000
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#define MAP_STACK_GROWS_UP 0x00002000
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#define MAP_ACC_CHARGED 0x00004000
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#define MAP_ACC_NO_CHARGE 0x00008000
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#define MAP_CREATE_STACK_GAP_UP 0x00010000
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#define MAP_CREATE_STACK_GAP_DN 0x00020000
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#define MAP_VN_EXEC 0x00040000
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#define MAP_SPLIT_BOUNDARY_MASK 0x00180000
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#define MAP_NO_HINT 0x00200000
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#define MAP_SPLIT_BOUNDARY_SHIFT 19
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/*
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* vm_fault option flags
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*/
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#define VM_FAULT_NORMAL 0x00 /* Nothing special */
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#define VM_FAULT_WIRE 0x01 /* Wire the mapped page */
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#define VM_FAULT_DIRTY 0x02 /* Dirty the page; use w/VM_PROT_COPY */
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#define VM_FAULT_NOFILL 0x04 /* Fail if the pager doesn't have a copy */
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/*
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* Initially, mappings are slightly sequential. The maximum window size must
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* account for the map entry's "read_ahead" field being defined as an uint8_t.
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*/
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#define VM_FAULT_READ_AHEAD_MIN 7
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#define VM_FAULT_READ_AHEAD_INIT 15
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#define VM_FAULT_READ_AHEAD_MAX min(atop(maxphys) - 1, UINT8_MAX)
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/*
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* The following "find_space" options are supported by vm_map_find().
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*
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* For VMFS_ALIGNED_SPACE, the desired alignment is specified to
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* the macro argument as log base 2 of the desired alignment.
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*/
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#define VMFS_NO_SPACE 0 /* don't find; use the given range */
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#define VMFS_ANY_SPACE 1 /* find a range with any alignment */
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#define VMFS_OPTIMAL_SPACE 2 /* find a range with optimal alignment*/
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#define VMFS_SUPER_SPACE 3 /* find a superpage-aligned range */
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#define VMFS_ALIGNED_SPACE(x) ((x) << 8) /* find a range with fixed alignment */
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/*
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* vm_map_wire and vm_map_unwire option flags
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*/
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#define VM_MAP_WIRE_SYSTEM 0 /* wiring in a kernel map */
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#define VM_MAP_WIRE_USER 1 /* wiring in a user map */
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#define VM_MAP_WIRE_NOHOLES 0 /* region must not have holes */
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#define VM_MAP_WIRE_HOLESOK 2 /* region may have holes */
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#define VM_MAP_WIRE_WRITE 4 /* Validate writable. */
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typedef int vm_map_entry_reader(void *token, vm_map_entry_t addr,
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vm_map_entry_t dest);
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#ifndef _KERNEL
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/*
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* Find the successor of a map_entry, using a reader to dereference pointers.
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* '*clone' is a copy of a vm_map entry. 'reader' is used to copy a map entry
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* at some address into '*clone'. Change *clone to a copy of the next map
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* entry, and return the address of that entry, or NULL if copying has failed.
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*
|
|
* This function is made available to user-space code that needs to traverse
|
|
* map entries.
|
|
*/
|
|
static inline vm_map_entry_t
|
|
vm_map_entry_read_succ(void *token, struct vm_map_entry *const clone,
|
|
vm_map_entry_reader reader)
|
|
{
|
|
vm_map_entry_t after, backup;
|
|
vm_offset_t start;
|
|
|
|
after = clone->right;
|
|
start = clone->start;
|
|
if (!reader(token, after, clone))
|
|
return (NULL);
|
|
backup = clone->left;
|
|
if (!reader(token, backup, clone))
|
|
return (NULL);
|
|
if (clone->start > start) {
|
|
do {
|
|
after = backup;
|
|
backup = clone->left;
|
|
if (!reader(token, backup, clone))
|
|
return (NULL);
|
|
} while (clone->start != start);
|
|
}
|
|
if (!reader(token, after, clone))
|
|
return (NULL);
|
|
return (after);
|
|
}
|
|
#endif /* ! _KERNEL */
|
|
|
|
#ifdef _KERNEL
|
|
boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t);
|
|
int vm_map_delete(vm_map_t, vm_offset_t, vm_offset_t);
|
|
int vm_map_find(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t,
|
|
vm_offset_t, int, vm_prot_t, vm_prot_t, int);
|
|
int vm_map_find_min(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *,
|
|
vm_size_t, vm_offset_t, vm_offset_t, int, vm_prot_t, vm_prot_t, int);
|
|
int vm_map_find_aligned(vm_map_t map, vm_offset_t *addr, vm_size_t length,
|
|
vm_offset_t max_addr, vm_offset_t alignment);
|
|
int vm_map_fixed(vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_size_t,
|
|
vm_prot_t, vm_prot_t, int);
|
|
vm_offset_t vm_map_findspace(vm_map_t, vm_offset_t, vm_size_t);
|
|
int vm_map_inherit (vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t);
|
|
void vm_map_init(vm_map_t, pmap_t, vm_offset_t, vm_offset_t);
|
|
int vm_map_insert (vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_offset_t, vm_prot_t, vm_prot_t, int);
|
|
int vm_map_lookup (vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
|
|
vm_pindex_t *, vm_prot_t *, boolean_t *);
|
|
int vm_map_lookup_locked(vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
|
|
vm_pindex_t *, vm_prot_t *, boolean_t *);
|
|
void vm_map_lookup_done (vm_map_t, vm_map_entry_t);
|
|
boolean_t vm_map_lookup_entry (vm_map_t, vm_offset_t, vm_map_entry_t *);
|
|
|
|
static inline vm_map_entry_t
|
|
vm_map_entry_first(vm_map_t map)
|
|
{
|
|
|
|
return (map->header.right);
|
|
}
|
|
|
|
static inline vm_map_entry_t
|
|
vm_map_entry_succ(vm_map_entry_t entry)
|
|
{
|
|
vm_map_entry_t after;
|
|
|
|
after = entry->right;
|
|
if (after->left->start > entry->start) {
|
|
do
|
|
after = after->left;
|
|
while (after->left != entry);
|
|
}
|
|
return (after);
|
|
}
|
|
|
|
#define VM_MAP_ENTRY_FOREACH(it, map) \
|
|
for ((it) = vm_map_entry_first(map); \
|
|
(it) != &(map)->header; \
|
|
(it) = vm_map_entry_succ(it))
|
|
|
|
#define VM_MAP_PROTECT_SET_PROT 0x0001
|
|
#define VM_MAP_PROTECT_SET_MAXPROT 0x0002
|
|
#define VM_MAP_PROTECT_GROWSDOWN 0x0004
|
|
|
|
int vm_map_protect(vm_map_t map, vm_offset_t start, vm_offset_t end,
|
|
vm_prot_t new_prot, vm_prot_t new_maxprot, int flags);
|
|
int vm_map_remove (vm_map_t, vm_offset_t, vm_offset_t);
|
|
vm_map_entry_t vm_map_try_merge_entries(vm_map_t map, vm_map_entry_t prev,
|
|
vm_map_entry_t entry);
|
|
void vm_map_startup (void);
|
|
int vm_map_submap (vm_map_t, vm_offset_t, vm_offset_t, vm_map_t);
|
|
int vm_map_sync(vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t);
|
|
int vm_map_madvise (vm_map_t, vm_offset_t, vm_offset_t, int);
|
|
int vm_map_stack (vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int);
|
|
int vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
|
|
int flags);
|
|
int vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags);
|
|
int vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end,
|
|
int flags);
|
|
long vmspace_swap_count(struct vmspace *vmspace);
|
|
void vm_map_entry_set_vnode_text(vm_map_entry_t entry, bool add);
|
|
#endif /* _KERNEL */
|
|
#endif /* _VM_MAP_ */
|