/* $OpenBSD: uvm_map.h,v 1.96 2025/09/14 13:06:02 mpi Exp $ */ /* $NetBSD: uvm_map.h,v 1.24 2001/02/18 21:19:08 chs Exp $ */ /* * Copyright (c) 2011 Ariane van der Steldt <ariane@openbsd.org> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * * Copyright (c) 1997 Charles D. Cranor and Washington University. * Copyright (c) 1991, 1993, The Regents of the University of California. * * All rights reserved. * * This code is derived from software contributed to Berkeley by * The Mach Operating System project at Carnegie-Mellon University. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)vm_map.h 8.3 (Berkeley) 3/15/94 * from: Id: uvm_map.h,v 1.1.2.3 1998/02/07 01:16:55 chs Exp * * * Copyright (c) 1987, 1990 Carnegie-Mellon University. * All rights reserved. * * Permission to use, copy, modify and distribute this software and * its documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. */ #ifndef _UVM_UVM_MAP_H_ #define _UVM_UVM_MAP_H_ #include <sys/mutex.h> #include <sys/rwlock.h> #ifdef _KERNEL /* * UVM_MAP_CLIP_START: ensure that the entry begins at or after * the starting address, if it doesn't we split the entry. * * => map must be locked by caller */ #define UVM_MAP_CLIP_START(_map, _entry, _addr) \ do { \ KASSERT((_entry)->end + (_entry)->fspace > (_addr)); \ if ((_entry)->start < (_addr)) \ uvm_map_clip_start((_map), (_entry), (_addr)); \ } while (0) /* * UVM_MAP_CLIP_END: ensure that the entry ends at or before * the ending address, if it doesn't we split the entry. * * => map must be locked by caller */ #define UVM_MAP_CLIP_END(_map, _entry, _addr) \ do { \ KASSERT((_entry)->start < (_addr)); \ if ((_entry)->end > (_addr)) \ uvm_map_clip_end((_map), (_entry), (_addr)); \ } while (0) /* * extract flags */ #define UVM_EXTRACT_FIXPROT 0x8 /* set prot to maxprot as we go */ #endif /* _KERNEL */ #include <uvm/uvm_anon.h> /* * Address map entries consist of start and end addresses, * a VM object (or sharing map) and offset into that object, * and user-exported inheritance and protection information. * Also included is control information for virtual copy operations. */ struct vm_map_entry { union { RBT_ENTRY(vm_map_entry) addr_entry; /* address tree */ SLIST_ENTRY(vm_map_entry) addr_kentry; } daddrs; union { RBT_ENTRY(vm_map_entry) rbtree; /* Link freespace tree. */ TAILQ_ENTRY(vm_map_entry) tailq;/* Link freespace queue. */ TAILQ_ENTRY(vm_map_entry) deadq;/* dead entry queue */ } dfree; #define uvm_map_entry_start_copy start vaddr_t start; /* start address */ vaddr_t end; /* end address */ vsize_t guard; /* bytes in guard */ vsize_t fspace; /* free space */ union { struct uvm_object *uvm_obj; /* uvm object */ struct vm_map *sub_map; /* belongs to another map */ } object; /* object I point to */ voff_t offset; /* offset into object */ struct vm_aref aref; /* anonymous overlay */ int etype; /* entry type */ vm_prot_t protection; /* protection code */ vm_prot_t max_protection; /* maximum protection */ vm_inherit_t inheritance; /* inheritance */ int wired_count; /* can be paged if == 0 */ int advice; /* madvise advice */ #define uvm_map_entry_stop_copy flags u_int8_t flags; /* flags */ #define UVM_MAP_STATIC 0x01 /* static map entry */ #define UVM_MAP_KMEM 0x02 /* from kmem entry pool */ vsize_t fspace_augment; /* max(fspace) in subtree */ }; #define VM_MAPENT_ISWIRED(entry) ((entry)->wired_count != 0) TAILQ_HEAD(uvm_map_deadq, vm_map_entry); /* dead entry queue */ RBT_HEAD(uvm_map_addr, vm_map_entry); #ifdef _KERNEL RBT_PROTOTYPE(uvm_map_addr, vm_map_entry, daddrs.addr_entry, uvm_mapentry_addrcmp); #endif /* * A Map is a rbtree of map entries, kept sorted by address. * In addition, free space entries are also kept in a rbtree, * indexed by free size. * * * * LOCKING PROTOCOL NOTES: * ----------------------- * * VM map locking is a little complicated. There are both shared * and exclusive locks on maps. However, it is sometimes required * to unlock a VM map (to prevent lock ordering issues) without * allowing any other thread to modify it. * * In order to prevent this scenario, we introduce the notion of * a `busy' map. A `busy' map is unlocked, but other threads * attempting to write-lock wait for this flag to clear before * entering the lock manager. A map may only be marked busy * when the map is write-locked and may only be marked unbusy by * the thread which marked it busy. * * Access to the map `flags' member is controlled by the `flags_lock' * simple lock. Note that some flags are static (set once at map * creation time, and never changed), and thus require no locking * to check those flags. All flags which are r/w must be set or * cleared while the `flags_lock' is asserted. Additional locking * requirements are: * * VM_MAP_PAGEABLE r/o static flag; no locking required * * VM_MAP_INTRSAFE r/o static flag; no locking required * * VM_MAP_WIREFUTURE r/w; may only be set or cleared when * map is write-locked. may be tested * without asserting `flags_lock'. * * VM_MAP_GUARDPAGES r/o; must be specified at map * initialization time. * If set, guards will appear between * automatic allocations. * No locking required. * * VM_MAP_ISVMSPACE r/o; set by uvmspace_alloc. * Signifies that this map is a vmspace. * (The implementation treats all maps * without this bit as kernel maps.) * No locking required. * * * All automatic allocations (uvm_map without MAP_FIXED) will allocate * from vm_map.free. * If that allocation fails: * - vmspace maps will spill over into vm_map.bfree, * - all other maps will call uvm_map_kmem_grow() to increase the arena. * * vmspace maps have their data, brk() and stack arenas automatically * updated when uvm_map() is invoked without MAP_FIXED. * The spill over arena (vm_map.bfree) will contain the space in the brk() * and stack ranges. * Kernel maps never have a bfree arena and this tree will always be empty. * * * read_locks and write_locks are used in lock debugging code. * * Locks used to protect struct members in this file: * a atomic operations * I immutable after creation or exec(2) * v `vm_map_lock' (this map `lock' or `mtx') * f flags_lock */ struct vm_map { struct pmap *pmap; /* [I] Physical map */ u_long sserial; /* [v] # stack changes */ struct uvm_map_addr addr; /* [v] Entry tree, by addr */ vsize_t size; /* virtual size */ int ref_count; /* [a] Reference count */ int flags; /* [f] flags */ unsigned int timestamp; /* Version number */ struct proc *busy; /* [f] thread holding map busy*/ unsigned int nbusy; /* [f] waiters for busy */ vaddr_t min_offset; /* [I] First address in map. */ vaddr_t max_offset; /* [I] Last address in map. */ /* * Allocation overflow regions. */ vaddr_t b_start; /* [v] Start for brk() alloc. */ vaddr_t b_end; /* [v] End for brk() alloc. */ vaddr_t s_start; /* [v] Start for stack alloc. */ vaddr_t s_end; /* [v] End for stack alloc. */ /* * Special address selectors. * * The uaddr_exe mapping is used if: * - protX is selected * - the pointer is not NULL * * If uaddr_exe is not used, the other mappings are checked in * order of appearance. * If a hint is given, the selection will only be used if the hint * falls in the range described by the mapping. * * The states are pointers because: * - they may not all be in use * - the struct size for different schemes is variable * * The uaddr_brk_stack selector will select addresses that are in * the brk/stack area of the map. */ struct uvm_addr_state *uaddr_exe; /* Executable selector. */ struct uvm_addr_state *uaddr_any[4]; /* More selectors. */ struct uvm_addr_state *uaddr_brk_stack; /* Brk/stack selector. */ #define UVM_MAP_CHECK_COPYIN_MAX 4 /* main, sigtramp, ld.so, libc.so */ struct uvm_check_copyin { vaddr_t start, end; } check_copyin[UVM_MAP_CHECK_COPYIN_MAX]; int check_copyin_count; /* * XXX struct mutex changes size because of compile options, so * place after fields which are inspected by libkvm / procmap(1) */ struct rwlock lock; /* Non-intrsafe lock */ struct mutex mtx; /* Intrsafe lock */ struct mutex flags_lock; /* flags lock */ }; /* vm_map flags */ #define VM_MAP_PAGEABLE 0x01 /* ro: entries are pageable */ #define VM_MAP_INTRSAFE 0x02 /* ro: interrupt safe map */ #define VM_MAP_WIREFUTURE 0x04 /* rw: wire future mappings */ #define VM_MAP_GUARDPAGES 0x20 /* rw: add guard pgs to map */ #define VM_MAP_ISVMSPACE 0x40 /* ro: map is a vmspace */ #define VM_MAP_PINSYSCALL_ONCE 0x100 /* rw: pinsyscall done */ /* Number of kernel maps and entries to statically allocate */ #define MAX_KMAPENT 1024 /* Sufficient to make it to the scheduler. */ #ifdef _KERNEL /* * globals: */ extern vaddr_t uvm_maxkaddr; /* * protos: the following prototypes define the interface to vm_map */ void uvm_map_deallocate(struct vm_map *); int uvm_map_clean(struct vm_map *, vaddr_t, vaddr_t, int); void uvm_map_clip_start(struct vm_map *, struct vm_map_entry *, vaddr_t); void uvm_map_clip_end(struct vm_map *, struct vm_map_entry *, vaddr_t); int uvm_map_extract(struct vm_map *, vaddr_t, vsize_t, vaddr_t *, int); struct vm_map * uvm_map_create(pmap_t, vaddr_t, vaddr_t, int); vaddr_t uvm_map_pie(vaddr_t); vaddr_t uvm_map_hint(struct vmspace *, vm_prot_t, vaddr_t, vaddr_t); int uvm_map_check_copyin_add(struct vm_map *, vaddr_t, vaddr_t); int uvm_map_immutable(struct vm_map *, vaddr_t, vaddr_t, int); int uvm_map_inherit(struct vm_map *, vaddr_t, vaddr_t, vm_inherit_t); int uvm_map_advice(struct vm_map *, vaddr_t, vaddr_t, int); void uvm_map_init(void); boolean_t uvm_map_lookup_entry(struct vm_map *, vaddr_t, vm_map_entry_t *); boolean_t uvm_map_is_stack_remappable(struct vm_map *, vaddr_t, vsize_t, int); int uvm_map_remap_as_stack(struct proc *, vaddr_t, vsize_t); void uvm_map_setup(struct vm_map *, pmap_t, vaddr_t, vaddr_t, int); int uvm_map_submap(struct vm_map *, vaddr_t, vaddr_t, struct vm_map *); void uvm_unmap(struct vm_map *, vaddr_t, vaddr_t); void uvm_unmap_detach(struct uvm_map_deadq *, int); int uvm_unmap_remove(struct vm_map*, vaddr_t, vaddr_t, struct uvm_map_deadq *, boolean_t, boolean_t, boolean_t); void uvm_map_set_uaddr(struct vm_map*, struct uvm_addr_state**, struct uvm_addr_state*); int uvm_map_mquery(struct vm_map*, vaddr_t*, vsize_t, voff_t, int); struct p_inentry; int uvm_map_inentry_sp(vm_map_entry_t); boolean_t uvm_map_inentry(struct proc *, struct p_inentry *, vaddr_t addr, const char *fmt, int (*fn)(vm_map_entry_t), u_long serial); struct kinfo_vmentry; int uvm_map_fill_vmmap(struct vm_map *, struct kinfo_vmentry *, size_t *); /* * VM map locking operations. */ boolean_t vm_map_lock_try_ln(struct vm_map*, char*, int); void vm_map_lock_ln(struct vm_map*, char*, int); void vm_map_lock_read_ln(struct vm_map*, char*, int); void vm_map_unlock_ln(struct vm_map*, char*, int); void vm_map_unlock_read_ln(struct vm_map*, char*, int); boolean_t vm_map_upgrade_ln(struct vm_map*, char*, int); void vm_map_downgrade_ln(struct vm_map*, char*, int); void vm_map_busy_ln(struct vm_map*, char*, int); void vm_map_unbusy_ln(struct vm_map*, char*, int); void vm_map_assert_anylock_ln(struct vm_map*, char*, int); void vm_map_assert_wrlock_ln(struct vm_map*, char*, int); #ifdef DIAGNOSTIC #define vm_map_lock_try(map) vm_map_lock_try_ln(map, __FILE__, __LINE__) #define vm_map_lock(map) vm_map_lock_ln(map, __FILE__, __LINE__) #define vm_map_lock_read(map) vm_map_lock_read_ln(map, __FILE__, __LINE__) #define vm_map_unlock(map) vm_map_unlock_ln(map, __FILE__, __LINE__) #define vm_map_unlock_read(map) vm_map_unlock_read_ln(map, __FILE__, __LINE__) #define vm_map_upgrade(map) vm_map_upgrade_ln(map, __FILE__, __LINE__) #define vm_map_downgrade(map) vm_map_downgrade_ln(map, __FILE__, __LINE__) #define vm_map_busy(map) vm_map_busy_ln(map, __FILE__, __LINE__) #define vm_map_unbusy(map) vm_map_unbusy_ln(map, __FILE__, __LINE__) #define vm_map_assert_anylock(map) \ vm_map_assert_anylock_ln(map, __FILE__, __LINE__) #define vm_map_assert_wrlock(map) \ vm_map_assert_wrlock_ln(map, __FILE__, __LINE__) #else #define vm_map_lock_try(map) vm_map_lock_try_ln(map, NULL, 0) #define vm_map_lock(map) vm_map_lock_ln(map, NULL, 0) #define vm_map_lock_read(map) vm_map_lock_read_ln(map, NULL, 0) #define vm_map_unlock(map) vm_map_unlock_ln(map, NULL, 0) #define vm_map_unlock_read(map) vm_map_unlock_read_ln(map, NULL, 0) #define vm_map_upgrade(map) vm_map_upgrade_ln(map, NULL, 0) #define vm_map_downgrade(map) vm_map_downgrade_ln(map, NULL, 0) #define vm_map_busy(map) vm_map_busy_ln(map, NULL, 0) #define vm_map_unbusy(map) vm_map_unbusy_ln(map, NULL, 0) #define vm_map_assert_anylock(map) vm_map_assert_anylock_ln(map, NULL, 0) #define vm_map_assert_wrlock(map) vm_map_assert_wrlock_ln(map, NULL, 0) #endif void uvm_map_lock_entry(struct vm_map_entry *); void uvm_map_unlock_entry(struct vm_map_entry *); #endif /* _KERNEL */ /* * Functions implemented as macros */ #define vm_map_min(map) ((map)->min_offset) #define vm_map_max(map) ((map)->max_offset) #define vm_map_pmap(map) ((map)->pmap) #endif /* _UVM_UVM_MAP_H_ */
