f364d4ac36
mtx_enter(lock, type) becomes:
mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks)
mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized)
similarily, for releasing a lock, we now have:
mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN.
We change the caller interface for the two different types of locks
because the semantics are entirely different for each case, and this
makes it explicitly clear and, at the same time, it rids us of the
extra `type' argument.
The enter->lock and exit->unlock change has been made with the idea
that we're "locking data" and not "entering locked code" in mind.
Further, remove all additional "flags" previously passed to the
lock acquire/release routines with the exception of two:
MTX_QUIET and MTX_NOSWITCH
The functionality of these flags is preserved and they can be passed
to the lock/unlock routines by calling the corresponding wrappers:
mtx_{lock, unlock}_flags(lock, flag(s)) and
mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN
locks, respectively.
Re-inline some lock acq/rel code; in the sleep lock case, we only
inline the _obtain_lock()s in order to ensure that the inlined code
fits into a cache line. In the spin lock case, we inline recursion and
actually only perform a function call if we need to spin. This change
has been made with the idea that we generally tend to avoid spin locks
and that also the spin locks that we do have and are heavily used
(i.e. sched_lock) do recurse, and therefore in an effort to reduce
function call overhead for some architectures (such as alpha), we
inline recursion for this case.
Create a new malloc type for the witness code and retire from using
the M_DEV type. The new type is called M_WITNESS and is only declared
if WITNESS is enabled.
Begin cleaning up some machdep/mutex.h code - specifically updated the
"optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN
and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently
need those.
Finally, caught up to the interface changes in all sys code.
Contributors: jake, jhb, jasone (in no particular order)
382 lines
14 KiB
C
382 lines
14 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* @(#)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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* $FreeBSD$
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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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/*
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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_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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struct vm_map_entry {
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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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vm_offset_t start; /* start address */
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vm_offset_t end; /* end address */
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vm_offset_t avail_ssize; /* amt can grow if this is a stack */
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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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/* Only in task maps: */
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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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vm_pindex_t lastr; /* last read */
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};
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#define MAP_ENTRY_NOSYNC 0x0001
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#define MAP_ENTRY_IS_SUB_MAP 0x0002
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#define MAP_ENTRY_COW 0x0004
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#define MAP_ENTRY_NEEDS_COPY 0x0008
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#define MAP_ENTRY_NOFAULT 0x0010
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#define MAP_ENTRY_USER_WIRED 0x0020
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#define MAP_ENTRY_BEHAV_NORMAL 0x0000 /* default behavior */
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#define MAP_ENTRY_BEHAV_SEQUENTIAL 0x0040 /* expect sequential access */
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#define MAP_ENTRY_BEHAV_RANDOM 0x0080 /* expect random access */
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#define MAP_ENTRY_BEHAV_RESERVED 0x00C0 /* future use */
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#define MAP_ENTRY_BEHAV_MASK 0x00C0
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#define MAP_ENTRY_NOCOREDUMP 0x0400 /* don't include in a core */
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static __inline u_char
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vm_map_entry_behavior(struct vm_map_entry *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 void
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vm_map_entry_set_behavior(struct vm_map_entry *entry, u_char behavior)
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{
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entry->eflags = (entry->eflags & ~MAP_ENTRY_BEHAV_MASK) |
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(behavior & MAP_ENTRY_BEHAV_MASK);
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}
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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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* Note: the lock structure cannot be the first element of vm_map
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* because this can result in a running lockup between two or more
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* system processes trying to kmem_alloc_wait() due to kmem_alloc_wait()
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* and free tsleep/waking up 'map' and the underlying lockmgr also
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* sleeping and waking up on 'map'. The lockup occurs when the map fills
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* up. The 'exec' map, for example.
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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 lock lock; /* Lock for map data */
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int nentries; /* Number of entries */
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vm_size_t size; /* virtual size */
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u_char system_map; /* Am I a system map? */
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vm_map_entry_t hint; /* hint for quick lookups */
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unsigned int timestamp; /* Version number */
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vm_map_entry_t first_free; /* First free space hint */
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struct pmap *pmap; /* Physical map */
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#define min_offset header.start
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#define max_offset header.end
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};
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/*
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* Shareable process virtual address space.
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* May eventually be merged with vm_map.
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* Several fields are temporary (text, data stuff).
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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 pmap vm_pmap; /* private physical map */
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int vm_refcnt; /* number of references */
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caddr_t vm_shm; /* SYS5 shared memory private data XXX */
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/* we copy from vm_startcopy to the end of the structure on fork */
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#define vm_startcopy vm_rssize
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segsz_t vm_rssize; /* current resident set size in pages */
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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; /* user virtual address of text XXX */
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caddr_t vm_daddr; /* user virtual address of data XXX */
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caddr_t vm_maxsaddr; /* user VA at max stack growth */
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caddr_t vm_minsaddr; /* user VA at max stack growth */
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};
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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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/* XXX This macro is not called anywhere, and (map)->ref_lock doesn't exist. */
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#define vm_map_lock_drain_interlock(map) \
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do { \
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lockmgr(&(map)->lock, LK_DRAIN|LK_INTERLOCK, \
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&(map)->ref_lock, curproc); \
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(map)->timestamp++; \
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} while(0)
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#ifdef DIAGNOSTIC
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/* #define MAP_LOCK_DIAGNOSTIC 1 */
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#ifdef MAP_LOCK_DIAGNOSTIC
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#define vm_map_lock(map) \
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do { \
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printf ("locking map LK_EXCLUSIVE: 0x%x\n", map); \
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if (lockmgr(&(map)->lock, LK_EXCLUSIVE, (void *)0, curproc) != 0) { \
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panic("vm_map_lock: failed to get lock"); \
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} \
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(map)->timestamp++; \
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} while(0)
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#else
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#define vm_map_lock(map) \
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do { \
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if (lockmgr(&(map)->lock, LK_EXCLUSIVE, (void *)0, curproc) != 0) { \
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panic("vm_map_lock: failed to get lock"); \
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} \
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(map)->timestamp++; \
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} while(0)
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#endif
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#else
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#define vm_map_lock(map) \
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do { \
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lockmgr(&(map)->lock, LK_EXCLUSIVE, (void *)0, curproc); \
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(map)->timestamp++; \
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} while(0)
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#endif /* DIAGNOSTIC */
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#if defined(MAP_LOCK_DIAGNOSTIC)
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#define vm_map_unlock(map) \
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do { \
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printf ("locking map LK_RELEASE: 0x%x\n", map); \
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lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc); \
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} while (0)
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#define vm_map_lock_read(map) \
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do { \
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printf ("locking map LK_SHARED: 0x%x\n", map); \
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lockmgr(&(map)->lock, LK_SHARED, (void *)0, curproc); \
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} while (0)
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#define vm_map_unlock_read(map) \
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do { \
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printf ("locking map LK_RELEASE: 0x%x\n", map); \
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lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc); \
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} while (0)
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#else
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#define vm_map_unlock(map) \
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lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc)
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#define vm_map_lock_read(map) \
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lockmgr(&(map)->lock, LK_SHARED, (void *)0, curproc)
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#define vm_map_unlock_read(map) \
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lockmgr(&(map)->lock, LK_RELEASE, (void *)0, curproc)
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#endif
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static __inline__ int
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_vm_map_lock_upgrade(vm_map_t map, struct proc *p) {
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int error;
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#if defined(MAP_LOCK_DIAGNOSTIC)
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printf("locking map LK_EXCLUPGRADE: 0x%x\n", map);
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#endif
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error = lockmgr(&map->lock, LK_EXCLUPGRADE, (void *)0, p);
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if (error == 0)
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map->timestamp++;
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return error;
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}
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#define vm_map_lock_upgrade(map) _vm_map_lock_upgrade(map, curproc)
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#if defined(MAP_LOCK_DIAGNOSTIC)
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#define vm_map_lock_downgrade(map) \
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do { \
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printf ("locking map LK_DOWNGRADE: 0x%x\n", map); \
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lockmgr(&(map)->lock, LK_DOWNGRADE, (void *)0, curproc); \
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} while (0)
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#else
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#define vm_map_lock_downgrade(map) \
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lockmgr(&(map)->lock, LK_DOWNGRADE, (void *)0, curproc)
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#endif
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#define vm_map_set_recursive(map) \
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do { \
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mtx_lock((map)->lock.lk_interlock); \
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(map)->lock.lk_flags |= LK_CANRECURSE; \
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mtx_unlock((map)->lock.lk_interlock); \
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} while(0)
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#define vm_map_clear_recursive(map) \
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do { \
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mtx_lock((map)->lock.lk_interlock); \
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(map)->lock.lk_flags &= ~LK_CANRECURSE; \
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mtx_unlock((map)->lock.lk_interlock); \
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} while(0)
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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)->min_offset)
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#define vm_map_max(map) ((map)->max_offset)
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#define vm_map_pmap(map) ((map)->pmap)
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static __inline struct pmap *
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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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static __inline long
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vmspace_resident_count(struct vmspace *vmspace)
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{
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return pmap_resident_count(vmspace_pmap(vmspace));
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}
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/* XXX: number of kernel maps and entries to statically allocate */
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#define MAX_KMAP 10
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#define MAX_KMAPENT 128
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#define MAX_MAPENT 128
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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_UNUSED_01 0x0001
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#define MAP_COPY_ON_WRITE 0x0002
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#define MAP_NOFAULT 0x0004
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#define MAP_PREFAULT 0x0008
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#define MAP_PREFAULT_PARTIAL 0x0010
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#define MAP_DISABLE_SYNCER 0x0020
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#define MAP_DISABLE_COREDUMP 0x0100
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/*
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* vm_fault option flags
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*/
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#define VM_FAULT_NORMAL 0 /* Nothing special */
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#define VM_FAULT_CHANGE_WIRING 1 /* Change the wiring as appropriate */
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#define VM_FAULT_USER_WIRE 2 /* Likewise, but for user purposes */
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#define VM_FAULT_WIRE_MASK (VM_FAULT_CHANGE_WIRING|VM_FAULT_USER_WIRE)
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#define VM_FAULT_HOLD 4 /* Hold the page */
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#define VM_FAULT_DIRTY 8 /* Dirty the page */
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#ifdef _KERNEL
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boolean_t vm_map_check_protection __P((vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t));
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struct pmap;
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vm_map_t vm_map_create __P((struct pmap *, vm_offset_t, vm_offset_t));
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int vm_map_delete __P((vm_map_t, vm_offset_t, vm_offset_t));
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int vm_map_find __P((vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t, boolean_t, vm_prot_t, vm_prot_t, int));
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int vm_map_findspace __P((vm_map_t, vm_offset_t, vm_size_t, vm_offset_t *));
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int vm_map_inherit __P((vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t));
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void vm_map_init __P((struct vm_map *, vm_offset_t, vm_offset_t));
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void vm_map_destroy __P((struct vm_map *));
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int vm_map_insert __P((vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_offset_t, vm_prot_t, vm_prot_t, int));
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int vm_map_lookup __P((vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
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vm_pindex_t *, vm_prot_t *, boolean_t *));
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void vm_map_lookup_done __P((vm_map_t, vm_map_entry_t));
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boolean_t vm_map_lookup_entry __P((vm_map_t, vm_offset_t, vm_map_entry_t *));
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int vm_map_pageable __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t));
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int vm_map_user_pageable __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t));
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int vm_map_clean __P((vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t));
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int vm_map_protect __P((vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t));
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int vm_map_remove __P((vm_map_t, vm_offset_t, vm_offset_t));
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void vm_map_startup __P((void));
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int vm_map_submap __P((vm_map_t, vm_offset_t, vm_offset_t, vm_map_t));
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int vm_map_madvise __P((vm_map_t, vm_offset_t, vm_offset_t, int));
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void vm_map_simplify_entry __P((vm_map_t, vm_map_entry_t));
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void vm_init2 __P((void));
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int vm_uiomove __P((vm_map_t, vm_object_t, off_t, int, vm_offset_t, int *));
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void vm_freeze_copyopts __P((vm_object_t, vm_pindex_t, vm_pindex_t));
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int vm_map_stack __P((vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int));
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int vm_map_growstack __P((struct proc *p, vm_offset_t addr));
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#endif
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#endif /* _VM_MAP_ */
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