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21cd6e6232
struct swblock entries by dividing the number of the entries by 2 until the swap metadata fits. - Reject swapon(2) upon failure of swap_zone allocation. This is just a temporary fix. Better solutions include: (suggested by: dillon) o reserving swap in SWAP_META_PAGES chunks, and o swapping the swblock structures themselves. Reviewed by: alfred, dillon
3079 lines
76 KiB
C
3079 lines
76 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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* from: @(#)vm_map.c 8.3 (Berkeley) 1/12/94
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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 mapping module.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/vmmeter.h>
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#include <sys/mman.h>
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#include <sys/vnode.h>
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#include <sys/resourcevar.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <sys/lock.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <vm/vm_object.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_zone.h>
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#include <vm/swap_pager.h>
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/*
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* Virtual memory maps provide for the mapping, protection,
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* and sharing of virtual memory objects. In addition,
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* this module provides for an efficient virtual copy of
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* memory from one map to another.
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*
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* Synchronization is required prior to most operations.
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*
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* Maps consist of an ordered doubly-linked list of simple
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* entries; a single hint is used to speed up lookups.
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*
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* Since portions of maps are specified by start/end addresses,
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* which may not align with existing map entries, all
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* routines merely "clip" entries to these start/end values.
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* [That is, an entry is split into two, bordering at a
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* start or end value.] Note that these clippings may not
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* always be necessary (as the two resulting entries are then
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* not changed); however, the clipping is done for convenience.
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*
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* As mentioned above, virtual copy operations are performed
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* by copying VM object references from one map to
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* another, and then marking both regions as copy-on-write.
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*/
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/*
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* vm_map_startup:
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*
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* Initialize the vm_map module. Must be called before
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* any other vm_map routines.
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*
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* Map and entry structures are allocated from the general
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* purpose memory pool with some exceptions:
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*
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* - The kernel map and kmem submap are allocated statically.
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* - Kernel map entries are allocated out of a static pool.
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*
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* These restrictions are necessary since malloc() uses the
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* maps and requires map entries.
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*/
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static struct vm_zone kmapentzone_store, mapentzone_store, mapzone_store;
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static vm_zone_t mapentzone, kmapentzone, mapzone, vmspace_zone;
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static struct vm_object kmapentobj, mapentobj, mapobj;
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static struct vm_map_entry map_entry_init[MAX_MAPENT];
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static struct vm_map_entry kmap_entry_init[MAX_KMAPENT];
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static struct vm_map map_init[MAX_KMAP];
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static void _vm_map_clip_end __P((vm_map_t, vm_map_entry_t, vm_offset_t));
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static void _vm_map_clip_start __P((vm_map_t, vm_map_entry_t, vm_offset_t));
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static vm_map_entry_t vm_map_entry_create __P((vm_map_t));
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static void vm_map_entry_delete __P((vm_map_t, vm_map_entry_t));
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static void vm_map_entry_dispose __P((vm_map_t, vm_map_entry_t));
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static void vm_map_entry_unwire __P((vm_map_t, vm_map_entry_t));
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static void vm_map_copy_entry __P((vm_map_t, vm_map_t, vm_map_entry_t,
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vm_map_entry_t));
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static void vm_map_split __P((vm_map_entry_t));
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void
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vm_map_startup()
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{
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mapzone = &mapzone_store;
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zbootinit(mapzone, "MAP", sizeof (struct vm_map),
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map_init, MAX_KMAP);
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kmapentzone = &kmapentzone_store;
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zbootinit(kmapentzone, "KMAP ENTRY", sizeof (struct vm_map_entry),
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kmap_entry_init, MAX_KMAPENT);
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mapentzone = &mapentzone_store;
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zbootinit(mapentzone, "MAP ENTRY", sizeof (struct vm_map_entry),
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map_entry_init, MAX_MAPENT);
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}
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/*
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* Allocate a vmspace structure, including a vm_map and pmap,
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* and initialize those structures. The refcnt is set to 1.
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* The remaining fields must be initialized by the caller.
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*/
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struct vmspace *
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vmspace_alloc(min, max)
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vm_offset_t min, max;
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{
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struct vmspace *vm;
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vm = zalloc(vmspace_zone);
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vm_map_init(&vm->vm_map, min, max);
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pmap_pinit(vmspace_pmap(vm));
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vm->vm_map.pmap = vmspace_pmap(vm); /* XXX */
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vm->vm_refcnt = 1;
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vm->vm_shm = NULL;
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return (vm);
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}
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void
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vm_init2(void) {
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zinitna(kmapentzone, &kmapentobj,
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NULL, 0, cnt.v_page_count / 4, ZONE_INTERRUPT, 1);
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zinitna(mapentzone, &mapentobj,
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NULL, 0, 0, 0, 1);
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zinitna(mapzone, &mapobj,
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NULL, 0, 0, 0, 1);
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vmspace_zone = zinit("VMSPACE", sizeof (struct vmspace), 0, 0, 3);
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pmap_init2();
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vm_object_init2();
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}
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void
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vmspace_free(vm)
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struct vmspace *vm;
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{
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if (vm->vm_refcnt == 0)
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panic("vmspace_free: attempt to free already freed vmspace");
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if (--vm->vm_refcnt == 0) {
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/*
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* Lock the map, to wait out all other references to it.
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* Delete all of the mappings and pages they hold, then call
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* the pmap module to reclaim anything left.
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*/
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vm_map_lock(&vm->vm_map);
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(void) vm_map_delete(&vm->vm_map, vm->vm_map.min_offset,
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vm->vm_map.max_offset);
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vm_map_unlock(&vm->vm_map);
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pmap_release(vmspace_pmap(vm));
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vm_map_destroy(&vm->vm_map);
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zfree(vmspace_zone, vm);
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}
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}
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/*
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* vm_map_create:
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*
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* Creates and returns a new empty VM map with
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* the given physical map structure, and having
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* the given lower and upper address bounds.
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*/
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vm_map_t
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vm_map_create(pmap, min, max)
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pmap_t pmap;
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vm_offset_t min, max;
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{
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vm_map_t result;
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result = zalloc(mapzone);
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vm_map_init(result, min, max);
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result->pmap = pmap;
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return (result);
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}
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/*
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* Initialize an existing vm_map structure
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* such as that in the vmspace structure.
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* The pmap is set elsewhere.
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*/
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void
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vm_map_init(map, min, max)
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struct vm_map *map;
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vm_offset_t min, max;
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{
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map->header.next = map->header.prev = &map->header;
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map->nentries = 0;
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map->size = 0;
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map->system_map = 0;
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map->min_offset = min;
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map->max_offset = max;
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map->first_free = &map->header;
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map->hint = &map->header;
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map->timestamp = 0;
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lockinit(&map->lock, PVM, "thrd_sleep", 0, LK_NOPAUSE);
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}
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void
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vm_map_destroy(map)
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struct vm_map *map;
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{
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lockdestroy(&map->lock);
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}
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/*
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* vm_map_entry_dispose: [ internal use only ]
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*
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* Inverse of vm_map_entry_create.
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*/
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static void
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vm_map_entry_dispose(map, entry)
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vm_map_t map;
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vm_map_entry_t entry;
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{
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zfree((map->system_map || !mapentzone) ? kmapentzone : mapentzone, entry);
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}
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/*
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* vm_map_entry_create: [ internal use only ]
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*
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* Allocates a VM map entry for insertion.
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* No entry fields are filled in. This routine is
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*/
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static vm_map_entry_t
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vm_map_entry_create(map)
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vm_map_t map;
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{
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vm_map_entry_t new_entry;
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new_entry = zalloc((map->system_map || !mapentzone) ?
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kmapentzone : mapentzone);
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if (new_entry == NULL)
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panic("vm_map_entry_create: kernel resources exhausted");
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return(new_entry);
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}
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/*
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* vm_map_entry_{un,}link:
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*
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* Insert/remove entries from maps.
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*/
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static __inline void
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vm_map_entry_link(vm_map_t map,
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vm_map_entry_t after_where,
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vm_map_entry_t entry)
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{
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map->nentries++;
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entry->prev = after_where;
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entry->next = after_where->next;
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entry->next->prev = entry;
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after_where->next = entry;
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}
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static __inline void
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vm_map_entry_unlink(vm_map_t map,
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vm_map_entry_t entry)
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{
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vm_map_entry_t prev = entry->prev;
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vm_map_entry_t next = entry->next;
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next->prev = prev;
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prev->next = next;
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map->nentries--;
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}
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/*
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* SAVE_HINT:
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*
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* Saves the specified entry as the hint for
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* future lookups.
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*/
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#define SAVE_HINT(map,value) \
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(map)->hint = (value);
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/*
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* vm_map_lookup_entry: [ internal use only ]
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*
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* Finds the map entry containing (or
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* immediately preceding) the specified address
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* in the given map; the entry is returned
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* in the "entry" parameter. The boolean
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* result indicates whether the address is
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* actually contained in the map.
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*/
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boolean_t
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vm_map_lookup_entry(map, address, entry)
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vm_map_t map;
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vm_offset_t address;
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vm_map_entry_t *entry; /* OUT */
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{
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vm_map_entry_t cur;
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vm_map_entry_t last;
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/*
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* Start looking either from the head of the list, or from the hint.
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*/
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cur = map->hint;
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if (cur == &map->header)
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cur = cur->next;
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if (address >= cur->start) {
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/*
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* Go from hint to end of list.
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*
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* But first, make a quick check to see if we are already looking
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* at the entry we want (which is usually the case). Note also
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* that we don't need to save the hint here... it is the same
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* hint (unless we are at the header, in which case the hint
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* didn't buy us anything anyway).
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*/
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last = &map->header;
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if ((cur != last) && (cur->end > address)) {
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*entry = cur;
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return (TRUE);
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}
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} else {
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/*
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* Go from start to hint, *inclusively*
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*/
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last = cur->next;
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cur = map->header.next;
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}
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/*
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* Search linearly
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*/
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while (cur != last) {
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if (cur->end > address) {
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if (address >= cur->start) {
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/*
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* Save this lookup for future hints, and
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* return
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*/
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*entry = cur;
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SAVE_HINT(map, cur);
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return (TRUE);
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}
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break;
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}
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cur = cur->next;
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}
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*entry = cur->prev;
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SAVE_HINT(map, *entry);
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return (FALSE);
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}
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/*
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* vm_map_insert:
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*
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* Inserts the given whole VM object into the target
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* map at the specified address range. The object's
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* size should match that of the address range.
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*
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* Requires that the map be locked, and leaves it so.
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*
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* If object is non-NULL, ref count must be bumped by caller
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* prior to making call to account for the new entry.
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*/
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int
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vm_map_insert(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
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vm_offset_t start, vm_offset_t end, vm_prot_t prot, vm_prot_t max,
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int cow)
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{
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vm_map_entry_t new_entry;
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vm_map_entry_t prev_entry;
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vm_map_entry_t temp_entry;
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vm_eflags_t protoeflags;
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/*
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* Check that the start and end points are not bogus.
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*/
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if ((start < map->min_offset) || (end > map->max_offset) ||
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(start >= end))
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return (KERN_INVALID_ADDRESS);
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/*
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* Find the entry prior to the proposed starting address; if it's part
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* of an existing entry, this range is bogus.
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*/
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if (vm_map_lookup_entry(map, start, &temp_entry))
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return (KERN_NO_SPACE);
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prev_entry = temp_entry;
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|
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/*
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* Assert that the next entry doesn't overlap the end point.
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*/
|
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|
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if ((prev_entry->next != &map->header) &&
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(prev_entry->next->start < end))
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return (KERN_NO_SPACE);
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protoeflags = 0;
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if (cow & MAP_COPY_ON_WRITE)
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protoeflags |= MAP_ENTRY_COW|MAP_ENTRY_NEEDS_COPY;
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if (cow & MAP_NOFAULT) {
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protoeflags |= MAP_ENTRY_NOFAULT;
|
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|
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KASSERT(object == NULL,
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("vm_map_insert: paradoxical MAP_NOFAULT request"));
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}
|
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if (cow & MAP_DISABLE_SYNCER)
|
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protoeflags |= MAP_ENTRY_NOSYNC;
|
|
if (cow & MAP_DISABLE_COREDUMP)
|
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protoeflags |= MAP_ENTRY_NOCOREDUMP;
|
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|
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if (object) {
|
|
/*
|
|
* When object is non-NULL, it could be shared with another
|
|
* process. We have to set or clear OBJ_ONEMAPPING
|
|
* appropriately.
|
|
*/
|
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if ((object->ref_count > 1) || (object->shadow_count != 0)) {
|
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vm_object_clear_flag(object, OBJ_ONEMAPPING);
|
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}
|
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}
|
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else if ((prev_entry != &map->header) &&
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(prev_entry->eflags == protoeflags) &&
|
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(prev_entry->end == start) &&
|
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(prev_entry->wired_count == 0) &&
|
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((prev_entry->object.vm_object == NULL) ||
|
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vm_object_coalesce(prev_entry->object.vm_object,
|
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OFF_TO_IDX(prev_entry->offset),
|
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(vm_size_t)(prev_entry->end - prev_entry->start),
|
|
(vm_size_t)(end - prev_entry->end)))) {
|
|
/*
|
|
* We were able to extend the object. Determine if we
|
|
* can extend the previous map entry to include the
|
|
* new range as well.
|
|
*/
|
|
if ((prev_entry->inheritance == VM_INHERIT_DEFAULT) &&
|
|
(prev_entry->protection == prot) &&
|
|
(prev_entry->max_protection == max)) {
|
|
map->size += (end - prev_entry->end);
|
|
prev_entry->end = end;
|
|
return (KERN_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* If we can extend the object but cannot extend the
|
|
* map entry, we have to create a new map entry. We
|
|
* must bump the ref count on the extended object to
|
|
* account for it.
|
|
*/
|
|
object = prev_entry->object.vm_object;
|
|
offset = prev_entry->offset +
|
|
(prev_entry->end - prev_entry->start);
|
|
vm_object_reference(object);
|
|
}
|
|
|
|
/*
|
|
* NOTE: if conditionals fail, object can be NULL here. This occurs
|
|
* in things like the buffer map where we manage kva but do not manage
|
|
* backing objects.
|
|
*/
|
|
|
|
/*
|
|
* Create a new entry
|
|
*/
|
|
|
|
new_entry = vm_map_entry_create(map);
|
|
new_entry->start = start;
|
|
new_entry->end = end;
|
|
|
|
new_entry->eflags = protoeflags;
|
|
new_entry->object.vm_object = object;
|
|
new_entry->offset = offset;
|
|
new_entry->avail_ssize = 0;
|
|
|
|
new_entry->inheritance = VM_INHERIT_DEFAULT;
|
|
new_entry->protection = prot;
|
|
new_entry->max_protection = max;
|
|
new_entry->wired_count = 0;
|
|
|
|
/*
|
|
* Insert the new entry into the list
|
|
*/
|
|
|
|
vm_map_entry_link(map, prev_entry, new_entry);
|
|
map->size += new_entry->end - new_entry->start;
|
|
|
|
/*
|
|
* Update the free space hint
|
|
*/
|
|
if ((map->first_free == prev_entry) &&
|
|
(prev_entry->end >= new_entry->start)) {
|
|
map->first_free = new_entry;
|
|
}
|
|
|
|
if (cow & (MAP_PREFAULT|MAP_PREFAULT_PARTIAL)) {
|
|
pmap_object_init_pt(map->pmap, start,
|
|
object, OFF_TO_IDX(offset), end - start,
|
|
cow & MAP_PREFAULT_PARTIAL);
|
|
}
|
|
|
|
return (KERN_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* Find sufficient space for `length' bytes in the given map, starting at
|
|
* `start'. The map must be locked. Returns 0 on success, 1 on no space.
|
|
*/
|
|
int
|
|
vm_map_findspace(map, start, length, addr)
|
|
vm_map_t map;
|
|
vm_offset_t start;
|
|
vm_size_t length;
|
|
vm_offset_t *addr;
|
|
{
|
|
vm_map_entry_t entry, next;
|
|
vm_offset_t end;
|
|
|
|
if (start < map->min_offset)
|
|
start = map->min_offset;
|
|
if (start > map->max_offset)
|
|
return (1);
|
|
|
|
/*
|
|
* Look for the first possible address; if there's already something
|
|
* at this address, we have to start after it.
|
|
*/
|
|
if (start == map->min_offset) {
|
|
if ((entry = map->first_free) != &map->header)
|
|
start = entry->end;
|
|
} else {
|
|
vm_map_entry_t tmp;
|
|
|
|
if (vm_map_lookup_entry(map, start, &tmp))
|
|
start = tmp->end;
|
|
entry = tmp;
|
|
}
|
|
|
|
/*
|
|
* Look through the rest of the map, trying to fit a new region in the
|
|
* gap between existing regions, or after the very last region.
|
|
*/
|
|
for (;; start = (entry = next)->end) {
|
|
/*
|
|
* Find the end of the proposed new region. Be sure we didn't
|
|
* go beyond the end of the map, or wrap around the address;
|
|
* if so, we lose. Otherwise, if this is the last entry, or
|
|
* if the proposed new region fits before the next entry, we
|
|
* win.
|
|
*/
|
|
end = start + length;
|
|
if (end > map->max_offset || end < start)
|
|
return (1);
|
|
next = entry->next;
|
|
if (next == &map->header || next->start >= end)
|
|
break;
|
|
}
|
|
SAVE_HINT(map, entry);
|
|
*addr = start;
|
|
if (map == kernel_map) {
|
|
vm_offset_t ksize;
|
|
if ((ksize = round_page(start + length)) > kernel_vm_end) {
|
|
pmap_growkernel(ksize);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vm_map_find finds an unallocated region in the target address
|
|
* map with the given length. The search is defined to be
|
|
* first-fit from the specified address; the region found is
|
|
* returned in the same parameter.
|
|
*
|
|
* If object is non-NULL, ref count must be bumped by caller
|
|
* prior to making call to account for the new entry.
|
|
*/
|
|
int
|
|
vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
|
|
vm_offset_t *addr, /* IN/OUT */
|
|
vm_size_t length, boolean_t find_space, vm_prot_t prot,
|
|
vm_prot_t max, int cow)
|
|
{
|
|
vm_offset_t start;
|
|
int result, s = 0;
|
|
|
|
start = *addr;
|
|
|
|
if (map == kmem_map || map == mb_map)
|
|
s = splvm();
|
|
|
|
vm_map_lock(map);
|
|
if (find_space) {
|
|
if (vm_map_findspace(map, start, length, addr)) {
|
|
vm_map_unlock(map);
|
|
if (map == kmem_map || map == mb_map)
|
|
splx(s);
|
|
return (KERN_NO_SPACE);
|
|
}
|
|
start = *addr;
|
|
}
|
|
result = vm_map_insert(map, object, offset,
|
|
start, start + length, prot, max, cow);
|
|
vm_map_unlock(map);
|
|
|
|
if (map == kmem_map || map == mb_map)
|
|
splx(s);
|
|
|
|
return (result);
|
|
}
|
|
|
|
/*
|
|
* vm_map_simplify_entry:
|
|
*
|
|
* Simplify the given map entry by merging with either neighbor.
|
|
*/
|
|
void
|
|
vm_map_simplify_entry(map, entry)
|
|
vm_map_t map;
|
|
vm_map_entry_t entry;
|
|
{
|
|
vm_map_entry_t next, prev;
|
|
vm_size_t prevsize, esize;
|
|
|
|
if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
|
|
return;
|
|
|
|
prev = entry->prev;
|
|
if (prev != &map->header) {
|
|
prevsize = prev->end - prev->start;
|
|
if ( (prev->end == entry->start) &&
|
|
(prev->object.vm_object == entry->object.vm_object) &&
|
|
(!prev->object.vm_object ||
|
|
(prev->offset + prevsize == entry->offset)) &&
|
|
(prev->eflags == entry->eflags) &&
|
|
(prev->protection == entry->protection) &&
|
|
(prev->max_protection == entry->max_protection) &&
|
|
(prev->inheritance == entry->inheritance) &&
|
|
(prev->wired_count == entry->wired_count)) {
|
|
if (map->first_free == prev)
|
|
map->first_free = entry;
|
|
if (map->hint == prev)
|
|
map->hint = entry;
|
|
vm_map_entry_unlink(map, prev);
|
|
entry->start = prev->start;
|
|
entry->offset = prev->offset;
|
|
if (prev->object.vm_object)
|
|
vm_object_deallocate(prev->object.vm_object);
|
|
vm_map_entry_dispose(map, prev);
|
|
}
|
|
}
|
|
|
|
next = entry->next;
|
|
if (next != &map->header) {
|
|
esize = entry->end - entry->start;
|
|
if ((entry->end == next->start) &&
|
|
(next->object.vm_object == entry->object.vm_object) &&
|
|
(!entry->object.vm_object ||
|
|
(entry->offset + esize == next->offset)) &&
|
|
(next->eflags == entry->eflags) &&
|
|
(next->protection == entry->protection) &&
|
|
(next->max_protection == entry->max_protection) &&
|
|
(next->inheritance == entry->inheritance) &&
|
|
(next->wired_count == entry->wired_count)) {
|
|
if (map->first_free == next)
|
|
map->first_free = entry;
|
|
if (map->hint == next)
|
|
map->hint = entry;
|
|
vm_map_entry_unlink(map, next);
|
|
entry->end = next->end;
|
|
if (next->object.vm_object)
|
|
vm_object_deallocate(next->object.vm_object);
|
|
vm_map_entry_dispose(map, next);
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* vm_map_clip_start: [ internal use only ]
|
|
*
|
|
* Asserts that the given entry begins at or after
|
|
* the specified address; if necessary,
|
|
* it splits the entry into two.
|
|
*/
|
|
#define vm_map_clip_start(map, entry, startaddr) \
|
|
{ \
|
|
if (startaddr > entry->start) \
|
|
_vm_map_clip_start(map, entry, startaddr); \
|
|
}
|
|
|
|
/*
|
|
* This routine is called only when it is known that
|
|
* the entry must be split.
|
|
*/
|
|
static void
|
|
_vm_map_clip_start(map, entry, start)
|
|
vm_map_t map;
|
|
vm_map_entry_t entry;
|
|
vm_offset_t start;
|
|
{
|
|
vm_map_entry_t new_entry;
|
|
|
|
/*
|
|
* Split off the front portion -- note that we must insert the new
|
|
* entry BEFORE this one, so that this entry has the specified
|
|
* starting address.
|
|
*/
|
|
|
|
vm_map_simplify_entry(map, entry);
|
|
|
|
/*
|
|
* If there is no object backing this entry, we might as well create
|
|
* one now. If we defer it, an object can get created after the map
|
|
* is clipped, and individual objects will be created for the split-up
|
|
* map. This is a bit of a hack, but is also about the best place to
|
|
* put this improvement.
|
|
*/
|
|
|
|
if (entry->object.vm_object == NULL) {
|
|
vm_object_t object;
|
|
object = vm_object_allocate(OBJT_DEFAULT,
|
|
atop(entry->end - entry->start));
|
|
entry->object.vm_object = object;
|
|
entry->offset = 0;
|
|
}
|
|
|
|
new_entry = vm_map_entry_create(map);
|
|
*new_entry = *entry;
|
|
|
|
new_entry->end = start;
|
|
entry->offset += (start - entry->start);
|
|
entry->start = start;
|
|
|
|
vm_map_entry_link(map, entry->prev, new_entry);
|
|
|
|
if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
|
|
vm_object_reference(new_entry->object.vm_object);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_map_clip_end: [ internal use only ]
|
|
*
|
|
* Asserts that the given entry ends at or before
|
|
* the specified address; if necessary,
|
|
* it splits the entry into two.
|
|
*/
|
|
|
|
#define vm_map_clip_end(map, entry, endaddr) \
|
|
{ \
|
|
if (endaddr < entry->end) \
|
|
_vm_map_clip_end(map, entry, endaddr); \
|
|
}
|
|
|
|
/*
|
|
* This routine is called only when it is known that
|
|
* the entry must be split.
|
|
*/
|
|
static void
|
|
_vm_map_clip_end(map, entry, end)
|
|
vm_map_t map;
|
|
vm_map_entry_t entry;
|
|
vm_offset_t end;
|
|
{
|
|
vm_map_entry_t new_entry;
|
|
|
|
/*
|
|
* If there is no object backing this entry, we might as well create
|
|
* one now. If we defer it, an object can get created after the map
|
|
* is clipped, and individual objects will be created for the split-up
|
|
* map. This is a bit of a hack, but is also about the best place to
|
|
* put this improvement.
|
|
*/
|
|
|
|
if (entry->object.vm_object == NULL) {
|
|
vm_object_t object;
|
|
object = vm_object_allocate(OBJT_DEFAULT,
|
|
atop(entry->end - entry->start));
|
|
entry->object.vm_object = object;
|
|
entry->offset = 0;
|
|
}
|
|
|
|
/*
|
|
* Create a new entry and insert it AFTER the specified entry
|
|
*/
|
|
|
|
new_entry = vm_map_entry_create(map);
|
|
*new_entry = *entry;
|
|
|
|
new_entry->start = entry->end = end;
|
|
new_entry->offset += (end - entry->start);
|
|
|
|
vm_map_entry_link(map, entry, new_entry);
|
|
|
|
if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
|
|
vm_object_reference(new_entry->object.vm_object);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* VM_MAP_RANGE_CHECK: [ internal use only ]
|
|
*
|
|
* Asserts that the starting and ending region
|
|
* addresses fall within the valid range of the map.
|
|
*/
|
|
#define VM_MAP_RANGE_CHECK(map, start, end) \
|
|
{ \
|
|
if (start < vm_map_min(map)) \
|
|
start = vm_map_min(map); \
|
|
if (end > vm_map_max(map)) \
|
|
end = vm_map_max(map); \
|
|
if (start > end) \
|
|
start = end; \
|
|
}
|
|
|
|
/*
|
|
* vm_map_submap: [ kernel use only ]
|
|
*
|
|
* Mark the given range as handled by a subordinate map.
|
|
*
|
|
* This range must have been created with vm_map_find,
|
|
* and no other operations may have been performed on this
|
|
* range prior to calling vm_map_submap.
|
|
*
|
|
* Only a limited number of operations can be performed
|
|
* within this rage after calling vm_map_submap:
|
|
* vm_fault
|
|
* [Don't try vm_map_copy!]
|
|
*
|
|
* To remove a submapping, one must first remove the
|
|
* range from the superior map, and then destroy the
|
|
* submap (if desired). [Better yet, don't try it.]
|
|
*/
|
|
int
|
|
vm_map_submap(map, start, end, submap)
|
|
vm_map_t map;
|
|
vm_offset_t start;
|
|
vm_offset_t end;
|
|
vm_map_t submap;
|
|
{
|
|
vm_map_entry_t entry;
|
|
int result = KERN_INVALID_ARGUMENT;
|
|
|
|
vm_map_lock(map);
|
|
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
if (vm_map_lookup_entry(map, start, &entry)) {
|
|
vm_map_clip_start(map, entry, start);
|
|
} else
|
|
entry = entry->next;
|
|
|
|
vm_map_clip_end(map, entry, end);
|
|
|
|
if ((entry->start == start) && (entry->end == end) &&
|
|
((entry->eflags & MAP_ENTRY_COW) == 0) &&
|
|
(entry->object.vm_object == NULL)) {
|
|
entry->object.sub_map = submap;
|
|
entry->eflags |= MAP_ENTRY_IS_SUB_MAP;
|
|
result = KERN_SUCCESS;
|
|
}
|
|
vm_map_unlock(map);
|
|
|
|
return (result);
|
|
}
|
|
|
|
/*
|
|
* vm_map_protect:
|
|
*
|
|
* Sets the protection of the specified address
|
|
* region in the target map. If "set_max" is
|
|
* specified, the maximum protection is to be set;
|
|
* otherwise, only the current protection is affected.
|
|
*/
|
|
int
|
|
vm_map_protect(vm_map_t map, vm_offset_t start, vm_offset_t end,
|
|
vm_prot_t new_prot, boolean_t set_max)
|
|
{
|
|
vm_map_entry_t current;
|
|
vm_map_entry_t entry;
|
|
|
|
vm_map_lock(map);
|
|
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
if (vm_map_lookup_entry(map, start, &entry)) {
|
|
vm_map_clip_start(map, entry, start);
|
|
} else {
|
|
entry = entry->next;
|
|
}
|
|
|
|
/*
|
|
* Make a first pass to check for protection violations.
|
|
*/
|
|
|
|
current = entry;
|
|
while ((current != &map->header) && (current->start < end)) {
|
|
if (current->eflags & MAP_ENTRY_IS_SUB_MAP) {
|
|
vm_map_unlock(map);
|
|
return (KERN_INVALID_ARGUMENT);
|
|
}
|
|
if ((new_prot & current->max_protection) != new_prot) {
|
|
vm_map_unlock(map);
|
|
return (KERN_PROTECTION_FAILURE);
|
|
}
|
|
current = current->next;
|
|
}
|
|
|
|
/*
|
|
* Go back and fix up protections. [Note that clipping is not
|
|
* necessary the second time.]
|
|
*/
|
|
|
|
current = entry;
|
|
|
|
while ((current != &map->header) && (current->start < end)) {
|
|
vm_prot_t old_prot;
|
|
|
|
vm_map_clip_end(map, current, end);
|
|
|
|
old_prot = current->protection;
|
|
if (set_max)
|
|
current->protection =
|
|
(current->max_protection = new_prot) &
|
|
old_prot;
|
|
else
|
|
current->protection = new_prot;
|
|
|
|
/*
|
|
* Update physical map if necessary. Worry about copy-on-write
|
|
* here -- CHECK THIS XXX
|
|
*/
|
|
|
|
if (current->protection != old_prot) {
|
|
#define MASK(entry) (((entry)->eflags & MAP_ENTRY_COW) ? ~VM_PROT_WRITE : \
|
|
VM_PROT_ALL)
|
|
|
|
pmap_protect(map->pmap, current->start,
|
|
current->end,
|
|
current->protection & MASK(current));
|
|
#undef MASK
|
|
}
|
|
|
|
vm_map_simplify_entry(map, current);
|
|
|
|
current = current->next;
|
|
}
|
|
|
|
vm_map_unlock(map);
|
|
return (KERN_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* vm_map_madvise:
|
|
*
|
|
* This routine traverses a processes map handling the madvise
|
|
* system call. Advisories are classified as either those effecting
|
|
* the vm_map_entry structure, or those effecting the underlying
|
|
* objects.
|
|
*/
|
|
|
|
int
|
|
vm_map_madvise(map, start, end, behav)
|
|
vm_map_t map;
|
|
vm_offset_t start, end;
|
|
int behav;
|
|
{
|
|
vm_map_entry_t current, entry;
|
|
int modify_map = 0;
|
|
|
|
/*
|
|
* Some madvise calls directly modify the vm_map_entry, in which case
|
|
* we need to use an exclusive lock on the map and we need to perform
|
|
* various clipping operations. Otherwise we only need a read-lock
|
|
* on the map.
|
|
*/
|
|
|
|
switch(behav) {
|
|
case MADV_NORMAL:
|
|
case MADV_SEQUENTIAL:
|
|
case MADV_RANDOM:
|
|
case MADV_NOSYNC:
|
|
case MADV_AUTOSYNC:
|
|
case MADV_NOCORE:
|
|
case MADV_CORE:
|
|
modify_map = 1;
|
|
vm_map_lock(map);
|
|
break;
|
|
case MADV_WILLNEED:
|
|
case MADV_DONTNEED:
|
|
case MADV_FREE:
|
|
vm_map_lock_read(map);
|
|
break;
|
|
default:
|
|
return (KERN_INVALID_ARGUMENT);
|
|
}
|
|
|
|
/*
|
|
* Locate starting entry and clip if necessary.
|
|
*/
|
|
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
if (vm_map_lookup_entry(map, start, &entry)) {
|
|
if (modify_map)
|
|
vm_map_clip_start(map, entry, start);
|
|
} else {
|
|
entry = entry->next;
|
|
}
|
|
|
|
if (modify_map) {
|
|
/*
|
|
* madvise behaviors that are implemented in the vm_map_entry.
|
|
*
|
|
* We clip the vm_map_entry so that behavioral changes are
|
|
* limited to the specified address range.
|
|
*/
|
|
for (current = entry;
|
|
(current != &map->header) && (current->start < end);
|
|
current = current->next
|
|
) {
|
|
if (current->eflags & MAP_ENTRY_IS_SUB_MAP)
|
|
continue;
|
|
|
|
vm_map_clip_end(map, current, end);
|
|
|
|
switch (behav) {
|
|
case MADV_NORMAL:
|
|
vm_map_entry_set_behavior(current, MAP_ENTRY_BEHAV_NORMAL);
|
|
break;
|
|
case MADV_SEQUENTIAL:
|
|
vm_map_entry_set_behavior(current, MAP_ENTRY_BEHAV_SEQUENTIAL);
|
|
break;
|
|
case MADV_RANDOM:
|
|
vm_map_entry_set_behavior(current, MAP_ENTRY_BEHAV_RANDOM);
|
|
break;
|
|
case MADV_NOSYNC:
|
|
current->eflags |= MAP_ENTRY_NOSYNC;
|
|
break;
|
|
case MADV_AUTOSYNC:
|
|
current->eflags &= ~MAP_ENTRY_NOSYNC;
|
|
break;
|
|
case MADV_NOCORE:
|
|
current->eflags |= MAP_ENTRY_NOCOREDUMP;
|
|
break;
|
|
case MADV_CORE:
|
|
current->eflags &= ~MAP_ENTRY_NOCOREDUMP;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
vm_map_simplify_entry(map, current);
|
|
}
|
|
vm_map_unlock(map);
|
|
} else {
|
|
vm_pindex_t pindex;
|
|
int count;
|
|
|
|
/*
|
|
* madvise behaviors that are implemented in the underlying
|
|
* vm_object.
|
|
*
|
|
* Since we don't clip the vm_map_entry, we have to clip
|
|
* the vm_object pindex and count.
|
|
*/
|
|
for (current = entry;
|
|
(current != &map->header) && (current->start < end);
|
|
current = current->next
|
|
) {
|
|
vm_offset_t useStart;
|
|
|
|
if (current->eflags & MAP_ENTRY_IS_SUB_MAP)
|
|
continue;
|
|
|
|
pindex = OFF_TO_IDX(current->offset);
|
|
count = atop(current->end - current->start);
|
|
useStart = current->start;
|
|
|
|
if (current->start < start) {
|
|
pindex += atop(start - current->start);
|
|
count -= atop(start - current->start);
|
|
useStart = start;
|
|
}
|
|
if (current->end > end)
|
|
count -= atop(current->end - end);
|
|
|
|
if (count <= 0)
|
|
continue;
|
|
|
|
vm_object_madvise(current->object.vm_object,
|
|
pindex, count, behav);
|
|
if (behav == MADV_WILLNEED) {
|
|
pmap_object_init_pt(
|
|
map->pmap,
|
|
useStart,
|
|
current->object.vm_object,
|
|
pindex,
|
|
(count << PAGE_SHIFT),
|
|
0
|
|
);
|
|
}
|
|
}
|
|
vm_map_unlock_read(map);
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
|
|
/*
|
|
* vm_map_inherit:
|
|
*
|
|
* Sets the inheritance of the specified address
|
|
* range in the target map. Inheritance
|
|
* affects how the map will be shared with
|
|
* child maps at the time of vm_map_fork.
|
|
*/
|
|
int
|
|
vm_map_inherit(vm_map_t map, vm_offset_t start, vm_offset_t end,
|
|
vm_inherit_t new_inheritance)
|
|
{
|
|
vm_map_entry_t entry;
|
|
vm_map_entry_t temp_entry;
|
|
|
|
switch (new_inheritance) {
|
|
case VM_INHERIT_NONE:
|
|
case VM_INHERIT_COPY:
|
|
case VM_INHERIT_SHARE:
|
|
break;
|
|
default:
|
|
return (KERN_INVALID_ARGUMENT);
|
|
}
|
|
|
|
vm_map_lock(map);
|
|
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
if (vm_map_lookup_entry(map, start, &temp_entry)) {
|
|
entry = temp_entry;
|
|
vm_map_clip_start(map, entry, start);
|
|
} else
|
|
entry = temp_entry->next;
|
|
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
vm_map_clip_end(map, entry, end);
|
|
|
|
entry->inheritance = new_inheritance;
|
|
|
|
vm_map_simplify_entry(map, entry);
|
|
|
|
entry = entry->next;
|
|
}
|
|
|
|
vm_map_unlock(map);
|
|
return (KERN_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* Implement the semantics of mlock
|
|
*/
|
|
int
|
|
vm_map_user_pageable(map, start, end, new_pageable)
|
|
vm_map_t map;
|
|
vm_offset_t start;
|
|
vm_offset_t end;
|
|
boolean_t new_pageable;
|
|
{
|
|
vm_map_entry_t entry;
|
|
vm_map_entry_t start_entry;
|
|
vm_offset_t estart;
|
|
int rv;
|
|
|
|
vm_map_lock(map);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
if (vm_map_lookup_entry(map, start, &start_entry) == FALSE) {
|
|
vm_map_unlock(map);
|
|
return (KERN_INVALID_ADDRESS);
|
|
}
|
|
|
|
if (new_pageable) {
|
|
|
|
entry = start_entry;
|
|
vm_map_clip_start(map, entry, start);
|
|
|
|
/*
|
|
* Now decrement the wiring count for each region. If a region
|
|
* becomes completely unwired, unwire its physical pages and
|
|
* mappings.
|
|
*/
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
if (entry->eflags & MAP_ENTRY_USER_WIRED) {
|
|
vm_map_clip_end(map, entry, end);
|
|
entry->eflags &= ~MAP_ENTRY_USER_WIRED;
|
|
entry->wired_count--;
|
|
if (entry->wired_count == 0)
|
|
vm_fault_unwire(map, entry->start, entry->end);
|
|
}
|
|
vm_map_simplify_entry(map,entry);
|
|
entry = entry->next;
|
|
}
|
|
} else {
|
|
|
|
entry = start_entry;
|
|
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
|
|
if (entry->eflags & MAP_ENTRY_USER_WIRED) {
|
|
entry = entry->next;
|
|
continue;
|
|
}
|
|
|
|
if (entry->wired_count != 0) {
|
|
entry->wired_count++;
|
|
entry->eflags |= MAP_ENTRY_USER_WIRED;
|
|
entry = entry->next;
|
|
continue;
|
|
}
|
|
|
|
/* Here on entry being newly wired */
|
|
|
|
if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
|
|
int copyflag = entry->eflags & MAP_ENTRY_NEEDS_COPY;
|
|
if (copyflag && ((entry->protection & VM_PROT_WRITE) != 0)) {
|
|
|
|
vm_object_shadow(&entry->object.vm_object,
|
|
&entry->offset,
|
|
atop(entry->end - entry->start));
|
|
entry->eflags &= ~MAP_ENTRY_NEEDS_COPY;
|
|
|
|
} else if (entry->object.vm_object == NULL) {
|
|
|
|
entry->object.vm_object =
|
|
vm_object_allocate(OBJT_DEFAULT,
|
|
atop(entry->end - entry->start));
|
|
entry->offset = (vm_offset_t) 0;
|
|
|
|
}
|
|
}
|
|
|
|
vm_map_clip_start(map, entry, start);
|
|
vm_map_clip_end(map, entry, end);
|
|
|
|
entry->wired_count++;
|
|
entry->eflags |= MAP_ENTRY_USER_WIRED;
|
|
estart = entry->start;
|
|
|
|
/* First we need to allow map modifications */
|
|
vm_map_set_recursive(map);
|
|
vm_map_lock_downgrade(map);
|
|
map->timestamp++;
|
|
|
|
rv = vm_fault_user_wire(map, entry->start, entry->end);
|
|
if (rv) {
|
|
|
|
entry->wired_count--;
|
|
entry->eflags &= ~MAP_ENTRY_USER_WIRED;
|
|
|
|
vm_map_clear_recursive(map);
|
|
vm_map_unlock(map);
|
|
|
|
(void) vm_map_user_pageable(map, start, entry->start, TRUE);
|
|
return rv;
|
|
}
|
|
|
|
vm_map_clear_recursive(map);
|
|
if (vm_map_lock_upgrade(map)) {
|
|
vm_map_lock(map);
|
|
if (vm_map_lookup_entry(map, estart, &entry)
|
|
== FALSE) {
|
|
vm_map_unlock(map);
|
|
(void) vm_map_user_pageable(map,
|
|
start,
|
|
estart,
|
|
TRUE);
|
|
return (KERN_INVALID_ADDRESS);
|
|
}
|
|
}
|
|
vm_map_simplify_entry(map,entry);
|
|
}
|
|
}
|
|
map->timestamp++;
|
|
vm_map_unlock(map);
|
|
return KERN_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* vm_map_pageable:
|
|
*
|
|
* Sets the pageability of the specified address
|
|
* range in the target map. Regions specified
|
|
* as not pageable require locked-down physical
|
|
* memory and physical page maps.
|
|
*
|
|
* The map must not be locked, but a reference
|
|
* must remain to the map throughout the call.
|
|
*/
|
|
int
|
|
vm_map_pageable(map, start, end, new_pageable)
|
|
vm_map_t map;
|
|
vm_offset_t start;
|
|
vm_offset_t end;
|
|
boolean_t new_pageable;
|
|
{
|
|
vm_map_entry_t entry;
|
|
vm_map_entry_t start_entry;
|
|
vm_offset_t failed = 0;
|
|
int rv;
|
|
|
|
vm_map_lock(map);
|
|
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
/*
|
|
* Only one pageability change may take place at one time, since
|
|
* vm_fault assumes it will be called only once for each
|
|
* wiring/unwiring. Therefore, we have to make sure we're actually
|
|
* changing the pageability for the entire region. We do so before
|
|
* making any changes.
|
|
*/
|
|
|
|
if (vm_map_lookup_entry(map, start, &start_entry) == FALSE) {
|
|
vm_map_unlock(map);
|
|
return (KERN_INVALID_ADDRESS);
|
|
}
|
|
entry = start_entry;
|
|
|
|
/*
|
|
* Actions are rather different for wiring and unwiring, so we have
|
|
* two separate cases.
|
|
*/
|
|
|
|
if (new_pageable) {
|
|
|
|
vm_map_clip_start(map, entry, start);
|
|
|
|
/*
|
|
* Unwiring. First ensure that the range to be unwired is
|
|
* really wired down and that there are no holes.
|
|
*/
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
|
|
if (entry->wired_count == 0 ||
|
|
(entry->end < end &&
|
|
(entry->next == &map->header ||
|
|
entry->next->start > entry->end))) {
|
|
vm_map_unlock(map);
|
|
return (KERN_INVALID_ARGUMENT);
|
|
}
|
|
entry = entry->next;
|
|
}
|
|
|
|
/*
|
|
* Now decrement the wiring count for each region. If a region
|
|
* becomes completely unwired, unwire its physical pages and
|
|
* mappings.
|
|
*/
|
|
entry = start_entry;
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
vm_map_clip_end(map, entry, end);
|
|
|
|
entry->wired_count--;
|
|
if (entry->wired_count == 0)
|
|
vm_fault_unwire(map, entry->start, entry->end);
|
|
|
|
vm_map_simplify_entry(map, entry);
|
|
|
|
entry = entry->next;
|
|
}
|
|
} else {
|
|
/*
|
|
* Wiring. We must do this in two passes:
|
|
*
|
|
* 1. Holding the write lock, we create any shadow or zero-fill
|
|
* objects that need to be created. Then we clip each map
|
|
* entry to the region to be wired and increment its wiring
|
|
* count. We create objects before clipping the map entries
|
|
* to avoid object proliferation.
|
|
*
|
|
* 2. We downgrade to a read lock, and call vm_fault_wire to
|
|
* fault in the pages for any newly wired area (wired_count is
|
|
* 1).
|
|
*
|
|
* Downgrading to a read lock for vm_fault_wire avoids a possible
|
|
* deadlock with another process that may have faulted on one
|
|
* of the pages to be wired (it would mark the page busy,
|
|
* blocking us, then in turn block on the map lock that we
|
|
* hold). Because of problems in the recursive lock package,
|
|
* we cannot upgrade to a write lock in vm_map_lookup. Thus,
|
|
* any actions that require the write lock must be done
|
|
* beforehand. Because we keep the read lock on the map, the
|
|
* copy-on-write status of the entries we modify here cannot
|
|
* change.
|
|
*/
|
|
|
|
/*
|
|
* Pass 1.
|
|
*/
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
if (entry->wired_count == 0) {
|
|
|
|
/*
|
|
* Perform actions of vm_map_lookup that need
|
|
* the write lock on the map: create a shadow
|
|
* object for a copy-on-write region, or an
|
|
* object for a zero-fill region.
|
|
*
|
|
* We don't have to do this for entries that
|
|
* point to sub maps, because we won't
|
|
* hold the lock on the sub map.
|
|
*/
|
|
if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
|
|
int copyflag = entry->eflags & MAP_ENTRY_NEEDS_COPY;
|
|
if (copyflag &&
|
|
((entry->protection & VM_PROT_WRITE) != 0)) {
|
|
|
|
vm_object_shadow(&entry->object.vm_object,
|
|
&entry->offset,
|
|
atop(entry->end - entry->start));
|
|
entry->eflags &= ~MAP_ENTRY_NEEDS_COPY;
|
|
} else if (entry->object.vm_object == NULL) {
|
|
entry->object.vm_object =
|
|
vm_object_allocate(OBJT_DEFAULT,
|
|
atop(entry->end - entry->start));
|
|
entry->offset = (vm_offset_t) 0;
|
|
}
|
|
}
|
|
}
|
|
vm_map_clip_start(map, entry, start);
|
|
vm_map_clip_end(map, entry, end);
|
|
entry->wired_count++;
|
|
|
|
/*
|
|
* Check for holes
|
|
*/
|
|
if (entry->end < end &&
|
|
(entry->next == &map->header ||
|
|
entry->next->start > entry->end)) {
|
|
/*
|
|
* Found one. Object creation actions do not
|
|
* need to be undone, but the wired counts
|
|
* need to be restored.
|
|
*/
|
|
while (entry != &map->header && entry->end > start) {
|
|
entry->wired_count--;
|
|
entry = entry->prev;
|
|
}
|
|
vm_map_unlock(map);
|
|
return (KERN_INVALID_ARGUMENT);
|
|
}
|
|
entry = entry->next;
|
|
}
|
|
|
|
/*
|
|
* Pass 2.
|
|
*/
|
|
|
|
/*
|
|
* HACK HACK HACK HACK
|
|
*
|
|
* If we are wiring in the kernel map or a submap of it,
|
|
* unlock the map to avoid deadlocks. We trust that the
|
|
* kernel is well-behaved, and therefore will not do
|
|
* anything destructive to this region of the map while
|
|
* we have it unlocked. We cannot trust user processes
|
|
* to do the same.
|
|
*
|
|
* HACK HACK HACK HACK
|
|
*/
|
|
if (vm_map_pmap(map) == kernel_pmap) {
|
|
vm_map_unlock(map); /* trust me ... */
|
|
} else {
|
|
vm_map_lock_downgrade(map);
|
|
}
|
|
|
|
rv = 0;
|
|
entry = start_entry;
|
|
while (entry != &map->header && entry->start < end) {
|
|
/*
|
|
* If vm_fault_wire fails for any page we need to undo
|
|
* what has been done. We decrement the wiring count
|
|
* for those pages which have not yet been wired (now)
|
|
* and unwire those that have (later).
|
|
*
|
|
* XXX this violates the locking protocol on the map,
|
|
* needs to be fixed.
|
|
*/
|
|
if (rv)
|
|
entry->wired_count--;
|
|
else if (entry->wired_count == 1) {
|
|
rv = vm_fault_wire(map, entry->start, entry->end);
|
|
if (rv) {
|
|
failed = entry->start;
|
|
entry->wired_count--;
|
|
}
|
|
}
|
|
entry = entry->next;
|
|
}
|
|
|
|
if (vm_map_pmap(map) == kernel_pmap) {
|
|
vm_map_lock(map);
|
|
}
|
|
if (rv) {
|
|
vm_map_unlock(map);
|
|
(void) vm_map_pageable(map, start, failed, TRUE);
|
|
return (rv);
|
|
}
|
|
vm_map_simplify_entry(map, start_entry);
|
|
}
|
|
|
|
vm_map_unlock(map);
|
|
|
|
return (KERN_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* vm_map_clean
|
|
*
|
|
* Push any dirty cached pages in the address range to their pager.
|
|
* If syncio is TRUE, dirty pages are written synchronously.
|
|
* If invalidate is TRUE, any cached pages are freed as well.
|
|
*
|
|
* Returns an error if any part of the specified range is not mapped.
|
|
*/
|
|
int
|
|
vm_map_clean(map, start, end, syncio, invalidate)
|
|
vm_map_t map;
|
|
vm_offset_t start;
|
|
vm_offset_t end;
|
|
boolean_t syncio;
|
|
boolean_t invalidate;
|
|
{
|
|
vm_map_entry_t current;
|
|
vm_map_entry_t entry;
|
|
vm_size_t size;
|
|
vm_object_t object;
|
|
vm_ooffset_t offset;
|
|
|
|
vm_map_lock_read(map);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
if (!vm_map_lookup_entry(map, start, &entry)) {
|
|
vm_map_unlock_read(map);
|
|
return (KERN_INVALID_ADDRESS);
|
|
}
|
|
/*
|
|
* Make a first pass to check for holes.
|
|
*/
|
|
for (current = entry; current->start < end; current = current->next) {
|
|
if (current->eflags & MAP_ENTRY_IS_SUB_MAP) {
|
|
vm_map_unlock_read(map);
|
|
return (KERN_INVALID_ARGUMENT);
|
|
}
|
|
if (end > current->end &&
|
|
(current->next == &map->header ||
|
|
current->end != current->next->start)) {
|
|
vm_map_unlock_read(map);
|
|
return (KERN_INVALID_ADDRESS);
|
|
}
|
|
}
|
|
|
|
if (invalidate)
|
|
pmap_remove(vm_map_pmap(map), start, end);
|
|
/*
|
|
* Make a second pass, cleaning/uncaching pages from the indicated
|
|
* objects as we go.
|
|
*/
|
|
for (current = entry; current->start < end; current = current->next) {
|
|
offset = current->offset + (start - current->start);
|
|
size = (end <= current->end ? end : current->end) - start;
|
|
if (current->eflags & MAP_ENTRY_IS_SUB_MAP) {
|
|
vm_map_t smap;
|
|
vm_map_entry_t tentry;
|
|
vm_size_t tsize;
|
|
|
|
smap = current->object.sub_map;
|
|
vm_map_lock_read(smap);
|
|
(void) vm_map_lookup_entry(smap, offset, &tentry);
|
|
tsize = tentry->end - offset;
|
|
if (tsize < size)
|
|
size = tsize;
|
|
object = tentry->object.vm_object;
|
|
offset = tentry->offset + (offset - tentry->start);
|
|
vm_map_unlock_read(smap);
|
|
} else {
|
|
object = current->object.vm_object;
|
|
}
|
|
/*
|
|
* Note that there is absolutely no sense in writing out
|
|
* anonymous objects, so we track down the vnode object
|
|
* to write out.
|
|
* We invalidate (remove) all pages from the address space
|
|
* anyway, for semantic correctness.
|
|
*/
|
|
while (object->backing_object) {
|
|
object = object->backing_object;
|
|
offset += object->backing_object_offset;
|
|
if (object->size < OFF_TO_IDX( offset + size))
|
|
size = IDX_TO_OFF(object->size) - offset;
|
|
}
|
|
if (object && (object->type == OBJT_VNODE) &&
|
|
(current->protection & VM_PROT_WRITE)) {
|
|
/*
|
|
* Flush pages if writing is allowed, invalidate them
|
|
* if invalidation requested. Pages undergoing I/O
|
|
* will be ignored by vm_object_page_remove().
|
|
*
|
|
* We cannot lock the vnode and then wait for paging
|
|
* to complete without deadlocking against vm_fault.
|
|
* Instead we simply call vm_object_page_remove() and
|
|
* allow it to block internally on a page-by-page
|
|
* basis when it encounters pages undergoing async
|
|
* I/O.
|
|
*/
|
|
int flags;
|
|
|
|
vm_object_reference(object);
|
|
vn_lock(object->handle, LK_EXCLUSIVE | LK_RETRY, curproc);
|
|
flags = (syncio || invalidate) ? OBJPC_SYNC : 0;
|
|
flags |= invalidate ? OBJPC_INVAL : 0;
|
|
vm_object_page_clean(object,
|
|
OFF_TO_IDX(offset),
|
|
OFF_TO_IDX(offset + size + PAGE_MASK),
|
|
flags);
|
|
if (invalidate) {
|
|
/*vm_object_pip_wait(object, "objmcl");*/
|
|
vm_object_page_remove(object,
|
|
OFF_TO_IDX(offset),
|
|
OFF_TO_IDX(offset + size + PAGE_MASK),
|
|
FALSE);
|
|
}
|
|
VOP_UNLOCK(object->handle, 0, curproc);
|
|
vm_object_deallocate(object);
|
|
}
|
|
start += size;
|
|
}
|
|
|
|
vm_map_unlock_read(map);
|
|
return (KERN_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* vm_map_entry_unwire: [ internal use only ]
|
|
*
|
|
* Make the region specified by this entry pageable.
|
|
*
|
|
* The map in question should be locked.
|
|
* [This is the reason for this routine's existence.]
|
|
*/
|
|
static void
|
|
vm_map_entry_unwire(map, entry)
|
|
vm_map_t map;
|
|
vm_map_entry_t entry;
|
|
{
|
|
vm_fault_unwire(map, entry->start, entry->end);
|
|
entry->wired_count = 0;
|
|
}
|
|
|
|
/*
|
|
* vm_map_entry_delete: [ internal use only ]
|
|
*
|
|
* Deallocate the given entry from the target map.
|
|
*/
|
|
static void
|
|
vm_map_entry_delete(map, entry)
|
|
vm_map_t map;
|
|
vm_map_entry_t entry;
|
|
{
|
|
vm_map_entry_unlink(map, entry);
|
|
map->size -= entry->end - entry->start;
|
|
|
|
if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {
|
|
vm_object_deallocate(entry->object.vm_object);
|
|
}
|
|
|
|
vm_map_entry_dispose(map, entry);
|
|
}
|
|
|
|
/*
|
|
* vm_map_delete: [ internal use only ]
|
|
*
|
|
* Deallocates the given address range from the target
|
|
* map.
|
|
*/
|
|
int
|
|
vm_map_delete(map, start, end)
|
|
vm_map_t map;
|
|
vm_offset_t start;
|
|
vm_offset_t end;
|
|
{
|
|
vm_object_t object;
|
|
vm_map_entry_t entry;
|
|
vm_map_entry_t first_entry;
|
|
|
|
/*
|
|
* Find the start of the region, and clip it
|
|
*/
|
|
|
|
if (!vm_map_lookup_entry(map, start, &first_entry))
|
|
entry = first_entry->next;
|
|
else {
|
|
entry = first_entry;
|
|
vm_map_clip_start(map, entry, start);
|
|
/*
|
|
* Fix the lookup hint now, rather than each time though the
|
|
* loop.
|
|
*/
|
|
SAVE_HINT(map, entry->prev);
|
|
}
|
|
|
|
/*
|
|
* Save the free space hint
|
|
*/
|
|
|
|
if (entry == &map->header) {
|
|
map->first_free = &map->header;
|
|
} else if (map->first_free->start >= start) {
|
|
map->first_free = entry->prev;
|
|
}
|
|
|
|
/*
|
|
* Step through all entries in this region
|
|
*/
|
|
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
vm_map_entry_t next;
|
|
vm_offset_t s, e;
|
|
vm_pindex_t offidxstart, offidxend, count;
|
|
|
|
vm_map_clip_end(map, entry, end);
|
|
|
|
s = entry->start;
|
|
e = entry->end;
|
|
next = entry->next;
|
|
|
|
offidxstart = OFF_TO_IDX(entry->offset);
|
|
count = OFF_TO_IDX(e - s);
|
|
object = entry->object.vm_object;
|
|
|
|
/*
|
|
* Unwire before removing addresses from the pmap; otherwise,
|
|
* unwiring will put the entries back in the pmap.
|
|
*/
|
|
if (entry->wired_count != 0) {
|
|
vm_map_entry_unwire(map, entry);
|
|
}
|
|
|
|
offidxend = offidxstart + count;
|
|
|
|
if ((object == kernel_object) || (object == kmem_object)) {
|
|
vm_object_page_remove(object, offidxstart, offidxend, FALSE);
|
|
} else {
|
|
pmap_remove(map->pmap, s, e);
|
|
if (object != NULL &&
|
|
object->ref_count != 1 &&
|
|
(object->flags & (OBJ_NOSPLIT|OBJ_ONEMAPPING)) == OBJ_ONEMAPPING &&
|
|
(object->type == OBJT_DEFAULT || object->type == OBJT_SWAP)) {
|
|
vm_object_collapse(object);
|
|
vm_object_page_remove(object, offidxstart, offidxend, FALSE);
|
|
if (object->type == OBJT_SWAP) {
|
|
swap_pager_freespace(object, offidxstart, count);
|
|
}
|
|
if (offidxend >= object->size &&
|
|
offidxstart < object->size) {
|
|
object->size = offidxstart;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Delete the entry (which may delete the object) only after
|
|
* removing all pmap entries pointing to its pages.
|
|
* (Otherwise, its page frames may be reallocated, and any
|
|
* modify bits will be set in the wrong object!)
|
|
*/
|
|
vm_map_entry_delete(map, entry);
|
|
entry = next;
|
|
}
|
|
return (KERN_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* vm_map_remove:
|
|
*
|
|
* Remove the given address range from the target map.
|
|
* This is the exported form of vm_map_delete.
|
|
*/
|
|
int
|
|
vm_map_remove(map, start, end)
|
|
vm_map_t map;
|
|
vm_offset_t start;
|
|
vm_offset_t end;
|
|
{
|
|
int result, s = 0;
|
|
|
|
if (map == kmem_map || map == mb_map)
|
|
s = splvm();
|
|
|
|
vm_map_lock(map);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
result = vm_map_delete(map, start, end);
|
|
vm_map_unlock(map);
|
|
|
|
if (map == kmem_map || map == mb_map)
|
|
splx(s);
|
|
|
|
return (result);
|
|
}
|
|
|
|
/*
|
|
* vm_map_check_protection:
|
|
*
|
|
* Assert that the target map allows the specified
|
|
* privilege on the entire address region given.
|
|
* The entire region must be allocated.
|
|
*/
|
|
boolean_t
|
|
vm_map_check_protection(vm_map_t map, vm_offset_t start, vm_offset_t end,
|
|
vm_prot_t protection)
|
|
{
|
|
vm_map_entry_t entry;
|
|
vm_map_entry_t tmp_entry;
|
|
|
|
if (!vm_map_lookup_entry(map, start, &tmp_entry)) {
|
|
return (FALSE);
|
|
}
|
|
entry = tmp_entry;
|
|
|
|
while (start < end) {
|
|
if (entry == &map->header) {
|
|
return (FALSE);
|
|
}
|
|
/*
|
|
* No holes allowed!
|
|
*/
|
|
|
|
if (start < entry->start) {
|
|
return (FALSE);
|
|
}
|
|
/*
|
|
* Check protection associated with entry.
|
|
*/
|
|
|
|
if ((entry->protection & protection) != protection) {
|
|
return (FALSE);
|
|
}
|
|
/* go to next entry */
|
|
|
|
start = entry->end;
|
|
entry = entry->next;
|
|
}
|
|
return (TRUE);
|
|
}
|
|
|
|
/*
|
|
* Split the pages in a map entry into a new object. This affords
|
|
* easier removal of unused pages, and keeps object inheritance from
|
|
* being a negative impact on memory usage.
|
|
*/
|
|
static void
|
|
vm_map_split(entry)
|
|
vm_map_entry_t entry;
|
|
{
|
|
vm_page_t m;
|
|
vm_object_t orig_object, new_object, source;
|
|
vm_offset_t s, e;
|
|
vm_pindex_t offidxstart, offidxend, idx;
|
|
vm_size_t size;
|
|
vm_ooffset_t offset;
|
|
|
|
orig_object = entry->object.vm_object;
|
|
if (orig_object->type != OBJT_DEFAULT && orig_object->type != OBJT_SWAP)
|
|
return;
|
|
if (orig_object->ref_count <= 1)
|
|
return;
|
|
|
|
offset = entry->offset;
|
|
s = entry->start;
|
|
e = entry->end;
|
|
|
|
offidxstart = OFF_TO_IDX(offset);
|
|
offidxend = offidxstart + OFF_TO_IDX(e - s);
|
|
size = offidxend - offidxstart;
|
|
|
|
new_object = vm_pager_allocate(orig_object->type,
|
|
NULL, IDX_TO_OFF(size), VM_PROT_ALL, 0LL);
|
|
if (new_object == NULL)
|
|
return;
|
|
|
|
source = orig_object->backing_object;
|
|
if (source != NULL) {
|
|
vm_object_reference(source); /* Referenced by new_object */
|
|
TAILQ_INSERT_TAIL(&source->shadow_head,
|
|
new_object, shadow_list);
|
|
vm_object_clear_flag(source, OBJ_ONEMAPPING);
|
|
new_object->backing_object_offset =
|
|
orig_object->backing_object_offset + IDX_TO_OFF(offidxstart);
|
|
new_object->backing_object = source;
|
|
source->shadow_count++;
|
|
source->generation++;
|
|
}
|
|
|
|
for (idx = 0; idx < size; idx++) {
|
|
vm_page_t m;
|
|
|
|
retry:
|
|
m = vm_page_lookup(orig_object, offidxstart + idx);
|
|
if (m == NULL)
|
|
continue;
|
|
|
|
/*
|
|
* We must wait for pending I/O to complete before we can
|
|
* rename the page.
|
|
*
|
|
* We do not have to VM_PROT_NONE the page as mappings should
|
|
* not be changed by this operation.
|
|
*/
|
|
if (vm_page_sleep_busy(m, TRUE, "spltwt"))
|
|
goto retry;
|
|
|
|
vm_page_busy(m);
|
|
vm_page_rename(m, new_object, idx);
|
|
/* page automatically made dirty by rename and cache handled */
|
|
vm_page_busy(m);
|
|
}
|
|
|
|
if (orig_object->type == OBJT_SWAP) {
|
|
vm_object_pip_add(orig_object, 1);
|
|
/*
|
|
* copy orig_object pages into new_object
|
|
* and destroy unneeded pages in
|
|
* shadow object.
|
|
*/
|
|
swap_pager_copy(orig_object, new_object, offidxstart, 0);
|
|
vm_object_pip_wakeup(orig_object);
|
|
}
|
|
|
|
for (idx = 0; idx < size; idx++) {
|
|
m = vm_page_lookup(new_object, idx);
|
|
if (m) {
|
|
vm_page_wakeup(m);
|
|
}
|
|
}
|
|
|
|
entry->object.vm_object = new_object;
|
|
entry->offset = 0LL;
|
|
vm_object_deallocate(orig_object);
|
|
}
|
|
|
|
/*
|
|
* vm_map_copy_entry:
|
|
*
|
|
* Copies the contents of the source entry to the destination
|
|
* entry. The entries *must* be aligned properly.
|
|
*/
|
|
static void
|
|
vm_map_copy_entry(src_map, dst_map, src_entry, dst_entry)
|
|
vm_map_t src_map, dst_map;
|
|
vm_map_entry_t src_entry, dst_entry;
|
|
{
|
|
vm_object_t src_object;
|
|
|
|
if ((dst_entry->eflags|src_entry->eflags) & MAP_ENTRY_IS_SUB_MAP)
|
|
return;
|
|
|
|
if (src_entry->wired_count == 0) {
|
|
|
|
/*
|
|
* If the source entry is marked needs_copy, it is already
|
|
* write-protected.
|
|
*/
|
|
if ((src_entry->eflags & MAP_ENTRY_NEEDS_COPY) == 0) {
|
|
pmap_protect(src_map->pmap,
|
|
src_entry->start,
|
|
src_entry->end,
|
|
src_entry->protection & ~VM_PROT_WRITE);
|
|
}
|
|
|
|
/*
|
|
* Make a copy of the object.
|
|
*/
|
|
if ((src_object = src_entry->object.vm_object) != NULL) {
|
|
|
|
if ((src_object->handle == NULL) &&
|
|
(src_object->type == OBJT_DEFAULT ||
|
|
src_object->type == OBJT_SWAP)) {
|
|
vm_object_collapse(src_object);
|
|
if ((src_object->flags & (OBJ_NOSPLIT|OBJ_ONEMAPPING)) == OBJ_ONEMAPPING) {
|
|
vm_map_split(src_entry);
|
|
src_object = src_entry->object.vm_object;
|
|
}
|
|
}
|
|
|
|
vm_object_reference(src_object);
|
|
vm_object_clear_flag(src_object, OBJ_ONEMAPPING);
|
|
dst_entry->object.vm_object = src_object;
|
|
src_entry->eflags |= (MAP_ENTRY_COW|MAP_ENTRY_NEEDS_COPY);
|
|
dst_entry->eflags |= (MAP_ENTRY_COW|MAP_ENTRY_NEEDS_COPY);
|
|
dst_entry->offset = src_entry->offset;
|
|
} else {
|
|
dst_entry->object.vm_object = NULL;
|
|
dst_entry->offset = 0;
|
|
}
|
|
|
|
pmap_copy(dst_map->pmap, src_map->pmap, dst_entry->start,
|
|
dst_entry->end - dst_entry->start, src_entry->start);
|
|
} else {
|
|
/*
|
|
* Of course, wired down pages can't be set copy-on-write.
|
|
* Cause wired pages to be copied into the new map by
|
|
* simulating faults (the new pages are pageable)
|
|
*/
|
|
vm_fault_copy_entry(dst_map, src_map, dst_entry, src_entry);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vmspace_fork:
|
|
* Create a new process vmspace structure and vm_map
|
|
* based on those of an existing process. The new map
|
|
* is based on the old map, according to the inheritance
|
|
* values on the regions in that map.
|
|
*
|
|
* The source map must not be locked.
|
|
*/
|
|
struct vmspace *
|
|
vmspace_fork(vm1)
|
|
struct vmspace *vm1;
|
|
{
|
|
struct vmspace *vm2;
|
|
vm_map_t old_map = &vm1->vm_map;
|
|
vm_map_t new_map;
|
|
vm_map_entry_t old_entry;
|
|
vm_map_entry_t new_entry;
|
|
vm_object_t object;
|
|
|
|
vm_map_lock(old_map);
|
|
|
|
vm2 = vmspace_alloc(old_map->min_offset, old_map->max_offset);
|
|
bcopy(&vm1->vm_startcopy, &vm2->vm_startcopy,
|
|
(caddr_t) (vm1 + 1) - (caddr_t) &vm1->vm_startcopy);
|
|
new_map = &vm2->vm_map; /* XXX */
|
|
new_map->timestamp = 1;
|
|
|
|
old_entry = old_map->header.next;
|
|
|
|
while (old_entry != &old_map->header) {
|
|
if (old_entry->eflags & MAP_ENTRY_IS_SUB_MAP)
|
|
panic("vm_map_fork: encountered a submap");
|
|
|
|
switch (old_entry->inheritance) {
|
|
case VM_INHERIT_NONE:
|
|
break;
|
|
|
|
case VM_INHERIT_SHARE:
|
|
/*
|
|
* Clone the entry, creating the shared object if necessary.
|
|
*/
|
|
object = old_entry->object.vm_object;
|
|
if (object == NULL) {
|
|
object = vm_object_allocate(OBJT_DEFAULT,
|
|
atop(old_entry->end - old_entry->start));
|
|
old_entry->object.vm_object = object;
|
|
old_entry->offset = (vm_offset_t) 0;
|
|
}
|
|
|
|
/*
|
|
* Add the reference before calling vm_object_shadow
|
|
* to insure that a shadow object is created.
|
|
*/
|
|
vm_object_reference(object);
|
|
if (old_entry->eflags & MAP_ENTRY_NEEDS_COPY) {
|
|
vm_object_shadow(&old_entry->object.vm_object,
|
|
&old_entry->offset,
|
|
atop(old_entry->end - old_entry->start));
|
|
old_entry->eflags &= ~MAP_ENTRY_NEEDS_COPY;
|
|
object = old_entry->object.vm_object;
|
|
}
|
|
vm_object_clear_flag(object, OBJ_ONEMAPPING);
|
|
|
|
/*
|
|
* Clone the entry, referencing the shared object.
|
|
*/
|
|
new_entry = vm_map_entry_create(new_map);
|
|
*new_entry = *old_entry;
|
|
new_entry->eflags &= ~MAP_ENTRY_USER_WIRED;
|
|
new_entry->wired_count = 0;
|
|
|
|
/*
|
|
* Insert the entry into the new map -- we know we're
|
|
* inserting at the end of the new map.
|
|
*/
|
|
|
|
vm_map_entry_link(new_map, new_map->header.prev,
|
|
new_entry);
|
|
|
|
/*
|
|
* Update the physical map
|
|
*/
|
|
|
|
pmap_copy(new_map->pmap, old_map->pmap,
|
|
new_entry->start,
|
|
(old_entry->end - old_entry->start),
|
|
old_entry->start);
|
|
break;
|
|
|
|
case VM_INHERIT_COPY:
|
|
/*
|
|
* Clone the entry and link into the map.
|
|
*/
|
|
new_entry = vm_map_entry_create(new_map);
|
|
*new_entry = *old_entry;
|
|
new_entry->eflags &= ~MAP_ENTRY_USER_WIRED;
|
|
new_entry->wired_count = 0;
|
|
new_entry->object.vm_object = NULL;
|
|
vm_map_entry_link(new_map, new_map->header.prev,
|
|
new_entry);
|
|
vm_map_copy_entry(old_map, new_map, old_entry,
|
|
new_entry);
|
|
break;
|
|
}
|
|
old_entry = old_entry->next;
|
|
}
|
|
|
|
new_map->size = old_map->size;
|
|
vm_map_unlock(old_map);
|
|
|
|
return (vm2);
|
|
}
|
|
|
|
int
|
|
vm_map_stack (vm_map_t map, vm_offset_t addrbos, vm_size_t max_ssize,
|
|
vm_prot_t prot, vm_prot_t max, int cow)
|
|
{
|
|
vm_map_entry_t prev_entry;
|
|
vm_map_entry_t new_stack_entry;
|
|
vm_size_t init_ssize;
|
|
int rv;
|
|
|
|
if (VM_MIN_ADDRESS > 0 && addrbos < VM_MIN_ADDRESS)
|
|
return (KERN_NO_SPACE);
|
|
|
|
if (max_ssize < SGROWSIZ)
|
|
init_ssize = max_ssize;
|
|
else
|
|
init_ssize = SGROWSIZ;
|
|
|
|
vm_map_lock(map);
|
|
|
|
/* If addr is already mapped, no go */
|
|
if (vm_map_lookup_entry(map, addrbos, &prev_entry)) {
|
|
vm_map_unlock(map);
|
|
return (KERN_NO_SPACE);
|
|
}
|
|
|
|
/* If we can't accomodate max_ssize in the current mapping,
|
|
* no go. However, we need to be aware that subsequent user
|
|
* mappings might map into the space we have reserved for
|
|
* stack, and currently this space is not protected.
|
|
*
|
|
* Hopefully we will at least detect this condition
|
|
* when we try to grow the stack.
|
|
*/
|
|
if ((prev_entry->next != &map->header) &&
|
|
(prev_entry->next->start < addrbos + max_ssize)) {
|
|
vm_map_unlock(map);
|
|
return (KERN_NO_SPACE);
|
|
}
|
|
|
|
/* We initially map a stack of only init_ssize. We will
|
|
* grow as needed later. Since this is to be a grow
|
|
* down stack, we map at the top of the range.
|
|
*
|
|
* Note: we would normally expect prot and max to be
|
|
* VM_PROT_ALL, and cow to be 0. Possibly we should
|
|
* eliminate these as input parameters, and just
|
|
* pass these values here in the insert call.
|
|
*/
|
|
rv = vm_map_insert(map, NULL, 0, addrbos + max_ssize - init_ssize,
|
|
addrbos + max_ssize, prot, max, cow);
|
|
|
|
/* Now set the avail_ssize amount */
|
|
if (rv == KERN_SUCCESS){
|
|
if (prev_entry != &map->header)
|
|
vm_map_clip_end(map, prev_entry, addrbos + max_ssize - init_ssize);
|
|
new_stack_entry = prev_entry->next;
|
|
if (new_stack_entry->end != addrbos + max_ssize ||
|
|
new_stack_entry->start != addrbos + max_ssize - init_ssize)
|
|
panic ("Bad entry start/end for new stack entry");
|
|
else
|
|
new_stack_entry->avail_ssize = max_ssize - init_ssize;
|
|
}
|
|
|
|
vm_map_unlock(map);
|
|
return (rv);
|
|
}
|
|
|
|
/* Attempts to grow a vm stack entry. Returns KERN_SUCCESS if the
|
|
* desired address is already mapped, or if we successfully grow
|
|
* the stack. Also returns KERN_SUCCESS if addr is outside the
|
|
* stack range (this is strange, but preserves compatibility with
|
|
* the grow function in vm_machdep.c).
|
|
*/
|
|
int
|
|
vm_map_growstack (struct proc *p, vm_offset_t addr)
|
|
{
|
|
vm_map_entry_t prev_entry;
|
|
vm_map_entry_t stack_entry;
|
|
vm_map_entry_t new_stack_entry;
|
|
struct vmspace *vm = p->p_vmspace;
|
|
vm_map_t map = &vm->vm_map;
|
|
vm_offset_t end;
|
|
int grow_amount;
|
|
int rv;
|
|
int is_procstack;
|
|
Retry:
|
|
vm_map_lock_read(map);
|
|
|
|
/* If addr is already in the entry range, no need to grow.*/
|
|
if (vm_map_lookup_entry(map, addr, &prev_entry)) {
|
|
vm_map_unlock_read(map);
|
|
return (KERN_SUCCESS);
|
|
}
|
|
|
|
if ((stack_entry = prev_entry->next) == &map->header) {
|
|
vm_map_unlock_read(map);
|
|
return (KERN_SUCCESS);
|
|
}
|
|
if (prev_entry == &map->header)
|
|
end = stack_entry->start - stack_entry->avail_ssize;
|
|
else
|
|
end = prev_entry->end;
|
|
|
|
/* This next test mimics the old grow function in vm_machdep.c.
|
|
* It really doesn't quite make sense, but we do it anyway
|
|
* for compatibility.
|
|
*
|
|
* If not growable stack, return success. This signals the
|
|
* caller to proceed as he would normally with normal vm.
|
|
*/
|
|
if (stack_entry->avail_ssize < 1 ||
|
|
addr >= stack_entry->start ||
|
|
addr < stack_entry->start - stack_entry->avail_ssize) {
|
|
vm_map_unlock_read(map);
|
|
return (KERN_SUCCESS);
|
|
}
|
|
|
|
/* Find the minimum grow amount */
|
|
grow_amount = roundup (stack_entry->start - addr, PAGE_SIZE);
|
|
if (grow_amount > stack_entry->avail_ssize) {
|
|
vm_map_unlock_read(map);
|
|
return (KERN_NO_SPACE);
|
|
}
|
|
|
|
/* If there is no longer enough space between the entries
|
|
* nogo, and adjust the available space. Note: this
|
|
* should only happen if the user has mapped into the
|
|
* stack area after the stack was created, and is
|
|
* probably an error.
|
|
*
|
|
* This also effectively destroys any guard page the user
|
|
* might have intended by limiting the stack size.
|
|
*/
|
|
if (grow_amount > stack_entry->start - end) {
|
|
if (vm_map_lock_upgrade(map))
|
|
goto Retry;
|
|
|
|
stack_entry->avail_ssize = stack_entry->start - end;
|
|
|
|
vm_map_unlock(map);
|
|
return (KERN_NO_SPACE);
|
|
}
|
|
|
|
is_procstack = addr >= (vm_offset_t)vm->vm_maxsaddr;
|
|
|
|
/* If this is the main process stack, see if we're over the
|
|
* stack limit.
|
|
*/
|
|
if (is_procstack && (ctob(vm->vm_ssize) + grow_amount >
|
|
p->p_rlimit[RLIMIT_STACK].rlim_cur)) {
|
|
vm_map_unlock_read(map);
|
|
return (KERN_NO_SPACE);
|
|
}
|
|
|
|
/* Round up the grow amount modulo SGROWSIZ */
|
|
grow_amount = roundup (grow_amount, SGROWSIZ);
|
|
if (grow_amount > stack_entry->avail_ssize) {
|
|
grow_amount = stack_entry->avail_ssize;
|
|
}
|
|
if (is_procstack && (ctob(vm->vm_ssize) + grow_amount >
|
|
p->p_rlimit[RLIMIT_STACK].rlim_cur)) {
|
|
grow_amount = p->p_rlimit[RLIMIT_STACK].rlim_cur -
|
|
ctob(vm->vm_ssize);
|
|
}
|
|
|
|
if (vm_map_lock_upgrade(map))
|
|
goto Retry;
|
|
|
|
/* Get the preliminary new entry start value */
|
|
addr = stack_entry->start - grow_amount;
|
|
|
|
/* If this puts us into the previous entry, cut back our growth
|
|
* to the available space. Also, see the note above.
|
|
*/
|
|
if (addr < end) {
|
|
stack_entry->avail_ssize = stack_entry->start - end;
|
|
addr = end;
|
|
}
|
|
|
|
rv = vm_map_insert(map, NULL, 0, addr, stack_entry->start,
|
|
VM_PROT_ALL,
|
|
VM_PROT_ALL,
|
|
0);
|
|
|
|
/* Adjust the available stack space by the amount we grew. */
|
|
if (rv == KERN_SUCCESS) {
|
|
if (prev_entry != &map->header)
|
|
vm_map_clip_end(map, prev_entry, addr);
|
|
new_stack_entry = prev_entry->next;
|
|
if (new_stack_entry->end != stack_entry->start ||
|
|
new_stack_entry->start != addr)
|
|
panic ("Bad stack grow start/end in new stack entry");
|
|
else {
|
|
new_stack_entry->avail_ssize = stack_entry->avail_ssize -
|
|
(new_stack_entry->end -
|
|
new_stack_entry->start);
|
|
if (is_procstack)
|
|
vm->vm_ssize += btoc(new_stack_entry->end -
|
|
new_stack_entry->start);
|
|
}
|
|
}
|
|
|
|
vm_map_unlock(map);
|
|
return (rv);
|
|
|
|
}
|
|
|
|
/*
|
|
* Unshare the specified VM space for exec. If other processes are
|
|
* mapped to it, then create a new one. The new vmspace is null.
|
|
*/
|
|
|
|
void
|
|
vmspace_exec(struct proc *p) {
|
|
struct vmspace *oldvmspace = p->p_vmspace;
|
|
struct vmspace *newvmspace;
|
|
vm_map_t map = &p->p_vmspace->vm_map;
|
|
|
|
newvmspace = vmspace_alloc(map->min_offset, map->max_offset);
|
|
bcopy(&oldvmspace->vm_startcopy, &newvmspace->vm_startcopy,
|
|
(caddr_t) (newvmspace + 1) - (caddr_t) &newvmspace->vm_startcopy);
|
|
/*
|
|
* This code is written like this for prototype purposes. The
|
|
* goal is to avoid running down the vmspace here, but let the
|
|
* other process's that are still using the vmspace to finally
|
|
* run it down. Even though there is little or no chance of blocking
|
|
* here, it is a good idea to keep this form for future mods.
|
|
*/
|
|
vmspace_free(oldvmspace);
|
|
p->p_vmspace = newvmspace;
|
|
pmap_pinit2(vmspace_pmap(newvmspace));
|
|
if (p == curproc)
|
|
pmap_activate(p);
|
|
}
|
|
|
|
/*
|
|
* Unshare the specified VM space for forcing COW. This
|
|
* is called by rfork, for the (RFMEM|RFPROC) == 0 case.
|
|
*/
|
|
|
|
void
|
|
vmspace_unshare(struct proc *p) {
|
|
struct vmspace *oldvmspace = p->p_vmspace;
|
|
struct vmspace *newvmspace;
|
|
|
|
if (oldvmspace->vm_refcnt == 1)
|
|
return;
|
|
newvmspace = vmspace_fork(oldvmspace);
|
|
vmspace_free(oldvmspace);
|
|
p->p_vmspace = newvmspace;
|
|
pmap_pinit2(vmspace_pmap(newvmspace));
|
|
if (p == curproc)
|
|
pmap_activate(p);
|
|
}
|
|
|
|
|
|
/*
|
|
* vm_map_lookup:
|
|
*
|
|
* Finds the VM object, offset, and
|
|
* protection for a given virtual address in the
|
|
* specified map, assuming a page fault of the
|
|
* type specified.
|
|
*
|
|
* Leaves the map in question locked for read; return
|
|
* values are guaranteed until a vm_map_lookup_done
|
|
* call is performed. Note that the map argument
|
|
* is in/out; the returned map must be used in
|
|
* the call to vm_map_lookup_done.
|
|
*
|
|
* A handle (out_entry) is returned for use in
|
|
* vm_map_lookup_done, to make that fast.
|
|
*
|
|
* If a lookup is requested with "write protection"
|
|
* specified, the map may be changed to perform virtual
|
|
* copying operations, although the data referenced will
|
|
* remain the same.
|
|
*/
|
|
int
|
|
vm_map_lookup(vm_map_t *var_map, /* IN/OUT */
|
|
vm_offset_t vaddr,
|
|
vm_prot_t fault_typea,
|
|
vm_map_entry_t *out_entry, /* OUT */
|
|
vm_object_t *object, /* OUT */
|
|
vm_pindex_t *pindex, /* OUT */
|
|
vm_prot_t *out_prot, /* OUT */
|
|
boolean_t *wired) /* OUT */
|
|
{
|
|
vm_map_entry_t entry;
|
|
vm_map_t map = *var_map;
|
|
vm_prot_t prot;
|
|
vm_prot_t fault_type = fault_typea;
|
|
|
|
RetryLookup:;
|
|
|
|
/*
|
|
* Lookup the faulting address.
|
|
*/
|
|
|
|
vm_map_lock_read(map);
|
|
|
|
#define RETURN(why) \
|
|
{ \
|
|
vm_map_unlock_read(map); \
|
|
return(why); \
|
|
}
|
|
|
|
/*
|
|
* If the map has an interesting hint, try it before calling full
|
|
* blown lookup routine.
|
|
*/
|
|
|
|
entry = map->hint;
|
|
|
|
*out_entry = entry;
|
|
|
|
if ((entry == &map->header) ||
|
|
(vaddr < entry->start) || (vaddr >= entry->end)) {
|
|
vm_map_entry_t tmp_entry;
|
|
|
|
/*
|
|
* Entry was either not a valid hint, or the vaddr was not
|
|
* contained in the entry, so do a full lookup.
|
|
*/
|
|
if (!vm_map_lookup_entry(map, vaddr, &tmp_entry))
|
|
RETURN(KERN_INVALID_ADDRESS);
|
|
|
|
entry = tmp_entry;
|
|
*out_entry = entry;
|
|
}
|
|
|
|
/*
|
|
* Handle submaps.
|
|
*/
|
|
|
|
if (entry->eflags & MAP_ENTRY_IS_SUB_MAP) {
|
|
vm_map_t old_map = map;
|
|
|
|
*var_map = map = entry->object.sub_map;
|
|
vm_map_unlock_read(old_map);
|
|
goto RetryLookup;
|
|
}
|
|
|
|
/*
|
|
* Check whether this task is allowed to have this page.
|
|
* Note the special case for MAP_ENTRY_COW
|
|
* pages with an override. This is to implement a forced
|
|
* COW for debuggers.
|
|
*/
|
|
|
|
if (fault_type & VM_PROT_OVERRIDE_WRITE)
|
|
prot = entry->max_protection;
|
|
else
|
|
prot = entry->protection;
|
|
|
|
fault_type &= (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
|
|
if ((fault_type & prot) != fault_type) {
|
|
RETURN(KERN_PROTECTION_FAILURE);
|
|
}
|
|
|
|
if ((entry->eflags & MAP_ENTRY_USER_WIRED) &&
|
|
(entry->eflags & MAP_ENTRY_COW) &&
|
|
(fault_type & VM_PROT_WRITE) &&
|
|
(fault_typea & VM_PROT_OVERRIDE_WRITE) == 0) {
|
|
RETURN(KERN_PROTECTION_FAILURE);
|
|
}
|
|
|
|
/*
|
|
* If this page is not pageable, we have to get it for all possible
|
|
* accesses.
|
|
*/
|
|
|
|
*wired = (entry->wired_count != 0);
|
|
if (*wired)
|
|
prot = fault_type = entry->protection;
|
|
|
|
/*
|
|
* If the entry was copy-on-write, we either ...
|
|
*/
|
|
|
|
if (entry->eflags & MAP_ENTRY_NEEDS_COPY) {
|
|
/*
|
|
* If we want to write the page, we may as well handle that
|
|
* now since we've got the map locked.
|
|
*
|
|
* If we don't need to write the page, we just demote the
|
|
* permissions allowed.
|
|
*/
|
|
|
|
if (fault_type & VM_PROT_WRITE) {
|
|
/*
|
|
* Make a new object, and place it in the object
|
|
* chain. Note that no new references have appeared
|
|
* -- one just moved from the map to the new
|
|
* object.
|
|
*/
|
|
|
|
if (vm_map_lock_upgrade(map))
|
|
goto RetryLookup;
|
|
|
|
vm_object_shadow(
|
|
&entry->object.vm_object,
|
|
&entry->offset,
|
|
atop(entry->end - entry->start));
|
|
|
|
entry->eflags &= ~MAP_ENTRY_NEEDS_COPY;
|
|
vm_map_lock_downgrade(map);
|
|
} else {
|
|
/*
|
|
* We're attempting to read a copy-on-write page --
|
|
* don't allow writes.
|
|
*/
|
|
|
|
prot &= ~VM_PROT_WRITE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create an object if necessary.
|
|
*/
|
|
if (entry->object.vm_object == NULL) {
|
|
if (vm_map_lock_upgrade(map))
|
|
goto RetryLookup;
|
|
|
|
entry->object.vm_object = vm_object_allocate(OBJT_DEFAULT,
|
|
atop(entry->end - entry->start));
|
|
entry->offset = 0;
|
|
vm_map_lock_downgrade(map);
|
|
}
|
|
|
|
/*
|
|
* Return the object/offset from this entry. If the entry was
|
|
* copy-on-write or empty, it has been fixed up.
|
|
*/
|
|
|
|
*pindex = OFF_TO_IDX((vaddr - entry->start) + entry->offset);
|
|
*object = entry->object.vm_object;
|
|
|
|
/*
|
|
* Return whether this is the only map sharing this data.
|
|
*/
|
|
|
|
*out_prot = prot;
|
|
return (KERN_SUCCESS);
|
|
|
|
#undef RETURN
|
|
}
|
|
|
|
/*
|
|
* vm_map_lookup_done:
|
|
*
|
|
* Releases locks acquired by a vm_map_lookup
|
|
* (according to the handle returned by that lookup).
|
|
*/
|
|
|
|
void
|
|
vm_map_lookup_done(map, entry)
|
|
vm_map_t map;
|
|
vm_map_entry_t entry;
|
|
{
|
|
/*
|
|
* Unlock the main-level map
|
|
*/
|
|
|
|
vm_map_unlock_read(map);
|
|
}
|
|
|
|
/*
|
|
* Implement uiomove with VM operations. This handles (and collateral changes)
|
|
* support every combination of source object modification, and COW type
|
|
* operations.
|
|
*/
|
|
int
|
|
vm_uiomove(mapa, srcobject, cp, cnta, uaddra, npages)
|
|
vm_map_t mapa;
|
|
vm_object_t srcobject;
|
|
off_t cp;
|
|
int cnta;
|
|
vm_offset_t uaddra;
|
|
int *npages;
|
|
{
|
|
vm_map_t map;
|
|
vm_object_t first_object, oldobject, object;
|
|
vm_map_entry_t entry;
|
|
vm_prot_t prot;
|
|
boolean_t wired;
|
|
int tcnt, rv;
|
|
vm_offset_t uaddr, start, end, tend;
|
|
vm_pindex_t first_pindex, osize, oindex;
|
|
off_t ooffset;
|
|
int cnt;
|
|
|
|
if (npages)
|
|
*npages = 0;
|
|
|
|
cnt = cnta;
|
|
uaddr = uaddra;
|
|
|
|
while (cnt > 0) {
|
|
map = mapa;
|
|
|
|
if ((vm_map_lookup(&map, uaddr,
|
|
VM_PROT_READ, &entry, &first_object,
|
|
&first_pindex, &prot, &wired)) != KERN_SUCCESS) {
|
|
return EFAULT;
|
|
}
|
|
|
|
vm_map_clip_start(map, entry, uaddr);
|
|
|
|
tcnt = cnt;
|
|
tend = uaddr + tcnt;
|
|
if (tend > entry->end) {
|
|
tcnt = entry->end - uaddr;
|
|
tend = entry->end;
|
|
}
|
|
|
|
vm_map_clip_end(map, entry, tend);
|
|
|
|
start = entry->start;
|
|
end = entry->end;
|
|
|
|
osize = atop(tcnt);
|
|
|
|
oindex = OFF_TO_IDX(cp);
|
|
if (npages) {
|
|
vm_pindex_t idx;
|
|
for (idx = 0; idx < osize; idx++) {
|
|
vm_page_t m;
|
|
if ((m = vm_page_lookup(srcobject, oindex + idx)) == NULL) {
|
|
vm_map_lookup_done(map, entry);
|
|
return 0;
|
|
}
|
|
/*
|
|
* disallow busy or invalid pages, but allow
|
|
* m->busy pages if they are entirely valid.
|
|
*/
|
|
if ((m->flags & PG_BUSY) ||
|
|
((m->valid & VM_PAGE_BITS_ALL) != VM_PAGE_BITS_ALL)) {
|
|
vm_map_lookup_done(map, entry);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we are changing an existing map entry, just redirect
|
|
* the object, and change mappings.
|
|
*/
|
|
if ((first_object->type == OBJT_VNODE) &&
|
|
((oldobject = entry->object.vm_object) == first_object)) {
|
|
|
|
if ((entry->offset != cp) || (oldobject != srcobject)) {
|
|
/*
|
|
* Remove old window into the file
|
|
*/
|
|
pmap_remove (map->pmap, uaddr, tend);
|
|
|
|
/*
|
|
* Force copy on write for mmaped regions
|
|
*/
|
|
vm_object_pmap_copy_1 (srcobject, oindex, oindex + osize);
|
|
|
|
/*
|
|
* Point the object appropriately
|
|
*/
|
|
if (oldobject != srcobject) {
|
|
|
|
/*
|
|
* Set the object optimization hint flag
|
|
*/
|
|
vm_object_set_flag(srcobject, OBJ_OPT);
|
|
vm_object_reference(srcobject);
|
|
entry->object.vm_object = srcobject;
|
|
|
|
if (oldobject) {
|
|
vm_object_deallocate(oldobject);
|
|
}
|
|
}
|
|
|
|
entry->offset = cp;
|
|
map->timestamp++;
|
|
} else {
|
|
pmap_remove (map->pmap, uaddr, tend);
|
|
}
|
|
|
|
} else if ((first_object->ref_count == 1) &&
|
|
(first_object->size == osize) &&
|
|
((first_object->type == OBJT_DEFAULT) ||
|
|
(first_object->type == OBJT_SWAP)) ) {
|
|
|
|
oldobject = first_object->backing_object;
|
|
|
|
if ((first_object->backing_object_offset != cp) ||
|
|
(oldobject != srcobject)) {
|
|
/*
|
|
* Remove old window into the file
|
|
*/
|
|
pmap_remove (map->pmap, uaddr, tend);
|
|
|
|
/*
|
|
* Remove unneeded old pages
|
|
*/
|
|
vm_object_page_remove(first_object, 0, 0, 0);
|
|
|
|
/*
|
|
* Invalidate swap space
|
|
*/
|
|
if (first_object->type == OBJT_SWAP) {
|
|
swap_pager_freespace(first_object,
|
|
0,
|
|
first_object->size);
|
|
}
|
|
|
|
/*
|
|
* Force copy on write for mmaped regions
|
|
*/
|
|
vm_object_pmap_copy_1 (srcobject, oindex, oindex + osize);
|
|
|
|
/*
|
|
* Point the object appropriately
|
|
*/
|
|
if (oldobject != srcobject) {
|
|
|
|
/*
|
|
* Set the object optimization hint flag
|
|
*/
|
|
vm_object_set_flag(srcobject, OBJ_OPT);
|
|
vm_object_reference(srcobject);
|
|
|
|
if (oldobject) {
|
|
TAILQ_REMOVE(&oldobject->shadow_head,
|
|
first_object, shadow_list);
|
|
oldobject->shadow_count--;
|
|
/* XXX bump generation? */
|
|
vm_object_deallocate(oldobject);
|
|
}
|
|
|
|
TAILQ_INSERT_TAIL(&srcobject->shadow_head,
|
|
first_object, shadow_list);
|
|
srcobject->shadow_count++;
|
|
/* XXX bump generation? */
|
|
|
|
first_object->backing_object = srcobject;
|
|
}
|
|
first_object->backing_object_offset = cp;
|
|
map->timestamp++;
|
|
} else {
|
|
pmap_remove (map->pmap, uaddr, tend);
|
|
}
|
|
/*
|
|
* Otherwise, we have to do a logical mmap.
|
|
*/
|
|
} else {
|
|
|
|
vm_object_set_flag(srcobject, OBJ_OPT);
|
|
vm_object_reference(srcobject);
|
|
|
|
pmap_remove (map->pmap, uaddr, tend);
|
|
|
|
vm_object_pmap_copy_1 (srcobject, oindex, oindex + osize);
|
|
vm_map_lock_upgrade(map);
|
|
|
|
if (entry == &map->header) {
|
|
map->first_free = &map->header;
|
|
} else if (map->first_free->start >= start) {
|
|
map->first_free = entry->prev;
|
|
}
|
|
|
|
SAVE_HINT(map, entry->prev);
|
|
vm_map_entry_delete(map, entry);
|
|
|
|
object = srcobject;
|
|
ooffset = cp;
|
|
|
|
rv = vm_map_insert(map, object, ooffset, start, tend,
|
|
VM_PROT_ALL, VM_PROT_ALL, MAP_COPY_ON_WRITE);
|
|
|
|
if (rv != KERN_SUCCESS)
|
|
panic("vm_uiomove: could not insert new entry: %d", rv);
|
|
}
|
|
|
|
/*
|
|
* Map the window directly, if it is already in memory
|
|
*/
|
|
pmap_object_init_pt(map->pmap, uaddr,
|
|
srcobject, oindex, tcnt, 0);
|
|
|
|
map->timestamp++;
|
|
vm_map_unlock(map);
|
|
|
|
cnt -= tcnt;
|
|
uaddr += tcnt;
|
|
cp += tcnt;
|
|
if (npages)
|
|
*npages += osize;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Performs the copy_on_write operations necessary to allow the virtual copies
|
|
* into user space to work. This has to be called for write(2) system calls
|
|
* from other processes, file unlinking, and file size shrinkage.
|
|
*/
|
|
void
|
|
vm_freeze_copyopts(object, froma, toa)
|
|
vm_object_t object;
|
|
vm_pindex_t froma, toa;
|
|
{
|
|
int rv;
|
|
vm_object_t robject;
|
|
vm_pindex_t idx;
|
|
|
|
if ((object == NULL) ||
|
|
((object->flags & OBJ_OPT) == 0))
|
|
return;
|
|
|
|
if (object->shadow_count > object->ref_count)
|
|
panic("vm_freeze_copyopts: sc > rc");
|
|
|
|
while((robject = TAILQ_FIRST(&object->shadow_head)) != NULL) {
|
|
vm_pindex_t bo_pindex;
|
|
vm_page_t m_in, m_out;
|
|
|
|
bo_pindex = OFF_TO_IDX(robject->backing_object_offset);
|
|
|
|
vm_object_reference(robject);
|
|
|
|
vm_object_pip_wait(robject, "objfrz");
|
|
|
|
if (robject->ref_count == 1) {
|
|
vm_object_deallocate(robject);
|
|
continue;
|
|
}
|
|
|
|
vm_object_pip_add(robject, 1);
|
|
|
|
for (idx = 0; idx < robject->size; idx++) {
|
|
|
|
m_out = vm_page_grab(robject, idx,
|
|
VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
|
|
|
|
if (m_out->valid == 0) {
|
|
m_in = vm_page_grab(object, bo_pindex + idx,
|
|
VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
|
|
if (m_in->valid == 0) {
|
|
rv = vm_pager_get_pages(object, &m_in, 1, 0);
|
|
if (rv != VM_PAGER_OK) {
|
|
printf("vm_freeze_copyopts: cannot read page from file: %lx\n", (long)m_in->pindex);
|
|
continue;
|
|
}
|
|
vm_page_deactivate(m_in);
|
|
}
|
|
|
|
vm_page_protect(m_in, VM_PROT_NONE);
|
|
pmap_copy_page(VM_PAGE_TO_PHYS(m_in), VM_PAGE_TO_PHYS(m_out));
|
|
m_out->valid = m_in->valid;
|
|
vm_page_dirty(m_out);
|
|
vm_page_activate(m_out);
|
|
vm_page_wakeup(m_in);
|
|
}
|
|
vm_page_wakeup(m_out);
|
|
}
|
|
|
|
object->shadow_count--;
|
|
object->ref_count--;
|
|
TAILQ_REMOVE(&object->shadow_head, robject, shadow_list);
|
|
robject->backing_object = NULL;
|
|
robject->backing_object_offset = 0;
|
|
|
|
vm_object_pip_wakeup(robject);
|
|
vm_object_deallocate(robject);
|
|
}
|
|
|
|
vm_object_clear_flag(object, OBJ_OPT);
|
|
}
|
|
|
|
#include "opt_ddb.h"
|
|
#ifdef DDB
|
|
#include <sys/kernel.h>
|
|
|
|
#include <ddb/ddb.h>
|
|
|
|
/*
|
|
* vm_map_print: [ debug ]
|
|
*/
|
|
DB_SHOW_COMMAND(map, vm_map_print)
|
|
{
|
|
static int nlines;
|
|
/* XXX convert args. */
|
|
vm_map_t map = (vm_map_t)addr;
|
|
boolean_t full = have_addr;
|
|
|
|
vm_map_entry_t entry;
|
|
|
|
db_iprintf("Task map %p: pmap=%p, nentries=%d, version=%u\n",
|
|
(void *)map,
|
|
(void *)map->pmap, map->nentries, map->timestamp);
|
|
nlines++;
|
|
|
|
if (!full && db_indent)
|
|
return;
|
|
|
|
db_indent += 2;
|
|
for (entry = map->header.next; entry != &map->header;
|
|
entry = entry->next) {
|
|
db_iprintf("map entry %p: start=%p, end=%p\n",
|
|
(void *)entry, (void *)entry->start, (void *)entry->end);
|
|
nlines++;
|
|
{
|
|
static char *inheritance_name[4] =
|
|
{"share", "copy", "none", "donate_copy"};
|
|
|
|
db_iprintf(" prot=%x/%x/%s",
|
|
entry->protection,
|
|
entry->max_protection,
|
|
inheritance_name[(int)(unsigned char)entry->inheritance]);
|
|
if (entry->wired_count != 0)
|
|
db_printf(", wired");
|
|
}
|
|
if (entry->eflags & MAP_ENTRY_IS_SUB_MAP) {
|
|
/* XXX no %qd in kernel. Truncate entry->offset. */
|
|
db_printf(", share=%p, offset=0x%lx\n",
|
|
(void *)entry->object.sub_map,
|
|
(long)entry->offset);
|
|
nlines++;
|
|
if ((entry->prev == &map->header) ||
|
|
(entry->prev->object.sub_map !=
|
|
entry->object.sub_map)) {
|
|
db_indent += 2;
|
|
vm_map_print((db_expr_t)(intptr_t)
|
|
entry->object.sub_map,
|
|
full, 0, (char *)0);
|
|
db_indent -= 2;
|
|
}
|
|
} else {
|
|
/* XXX no %qd in kernel. Truncate entry->offset. */
|
|
db_printf(", object=%p, offset=0x%lx",
|
|
(void *)entry->object.vm_object,
|
|
(long)entry->offset);
|
|
if (entry->eflags & MAP_ENTRY_COW)
|
|
db_printf(", copy (%s)",
|
|
(entry->eflags & MAP_ENTRY_NEEDS_COPY) ? "needed" : "done");
|
|
db_printf("\n");
|
|
nlines++;
|
|
|
|
if ((entry->prev == &map->header) ||
|
|
(entry->prev->object.vm_object !=
|
|
entry->object.vm_object)) {
|
|
db_indent += 2;
|
|
vm_object_print((db_expr_t)(intptr_t)
|
|
entry->object.vm_object,
|
|
full, 0, (char *)0);
|
|
nlines += 4;
|
|
db_indent -= 2;
|
|
}
|
|
}
|
|
}
|
|
db_indent -= 2;
|
|
if (db_indent == 0)
|
|
nlines = 0;
|
|
}
|
|
|
|
|
|
DB_SHOW_COMMAND(procvm, procvm)
|
|
{
|
|
struct proc *p;
|
|
|
|
if (have_addr) {
|
|
p = (struct proc *) addr;
|
|
} else {
|
|
p = curproc;
|
|
}
|
|
|
|
db_printf("p = %p, vmspace = %p, map = %p, pmap = %p\n",
|
|
(void *)p, (void *)p->p_vmspace, (void *)&p->p_vmspace->vm_map,
|
|
(void *)vmspace_pmap(p->p_vmspace));
|
|
|
|
vm_map_print((db_expr_t)(intptr_t)&p->p_vmspace->vm_map, 1, 0, NULL);
|
|
}
|
|
|
|
#endif /* DDB */
|