3302 lines
86 KiB
C
3302 lines
86 KiB
C
/* $NetBSD: uvm_map.c,v 1.28 1998/08/31 01:54:14 thorpej Exp $ */
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/*
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* XXXCDC: "ROUGH DRAFT" QUALITY UVM PRE-RELEASE FILE!
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* >>>USE AT YOUR OWN RISK, WORK IS NOT FINISHED<<<
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*/
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/*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* Copyright (c) 1991, 1993, The Regents of the University of California.
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*
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. 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 Charles D. Cranor,
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* Washington University, the University of California, Berkeley and
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* its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)vm_map.c 8.3 (Berkeley) 1/12/94
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* from: Id: uvm_map.c,v 1.1.2.27 1998/02/07 01:16:54 chs Exp
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include "opt_ddb.h"
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#include "opt_uvmhist.h"
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#include "opt_pmap_new.h"
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/*
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* uvm_map.c: uvm map operations
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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/mman.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/pool.h>
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#ifdef SYSVSHM
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#include <sys/shm.h>
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#endif
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/vm_kern.h>
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#define UVM_MAP
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#include <uvm/uvm.h>
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#ifdef DDB
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#include <uvm/uvm_ddb.h>
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#endif
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struct uvm_cnt uvm_map_call, map_backmerge, map_forwmerge;
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struct uvm_cnt uvm_mlk_call, uvm_mlk_hint;
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/*
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* pool for vmspace structures.
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*/
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struct pool uvm_vmspace_pool;
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/*
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* pool for dynamically-allocated map entries.
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*/
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struct pool uvm_map_entry_pool;
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/*
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* macros
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*/
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/*
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* uvm_map_entry_link: insert entry into a map
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*
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* => map must be locked
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*/
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#define uvm_map_entry_link(map, after_where, entry) do { \
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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)->prev->next = (entry); \
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(entry)->next->prev = (entry); \
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} while (0)
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/*
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* uvm_map_entry_unlink: remove entry from a map
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*
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* => map must be locked
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*/
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#define uvm_map_entry_unlink(map, entry) do { \
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(map)->nentries--; \
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(entry)->next->prev = (entry)->prev; \
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(entry)->prev->next = (entry)->next; \
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} while (0)
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/*
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* SAVE_HINT: saves the specified entry as the hint for future lookups.
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*
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* => map need not be locked (protected by hint_lock).
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*/
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#define SAVE_HINT(map,value) do { \
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simple_lock(&(map)->hint_lock); \
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(map)->hint = (value); \
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simple_unlock(&(map)->hint_lock); \
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} while (0)
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/*
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* VM_MAP_RANGE_CHECK: check and correct range
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*
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* => map must at least be read locked
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*/
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#define VM_MAP_RANGE_CHECK(map, start, end) do { \
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if (start < vm_map_min(map)) \
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start = vm_map_min(map); \
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if (end > vm_map_max(map)) \
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end = vm_map_max(map); \
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if (start > end) \
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start = end; \
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} while (0)
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/*
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* local prototypes
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*/
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static vm_map_entry_t uvm_mapent_alloc __P((vm_map_t));
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static void uvm_mapent_copy __P((vm_map_entry_t,vm_map_entry_t));
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static void uvm_mapent_free __P((vm_map_entry_t));
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static void uvm_map_entry_unwire __P((vm_map_t, vm_map_entry_t));
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/*
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* local inlines
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*/
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/*
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* uvm_mapent_alloc: allocate a map entry
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*
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* => XXX: static pool for kernel map?
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*/
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static __inline vm_map_entry_t
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uvm_mapent_alloc(map)
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vm_map_t map;
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{
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vm_map_entry_t me;
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int s;
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UVMHIST_FUNC("uvm_mapent_alloc");
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UVMHIST_CALLED(maphist);
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if (map->entries_pageable) {
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me = pool_get(&uvm_map_entry_pool, PR_WAITOK);
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me->flags = 0;
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/* me can't be null, wait ok */
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} else {
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s = splimp(); /* protect kentry_free list with splimp */
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simple_lock(&uvm.kentry_lock);
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me = uvm.kentry_free;
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if (me) uvm.kentry_free = me->next;
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simple_unlock(&uvm.kentry_lock);
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splx(s);
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if (!me)
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panic("mapent_alloc: out of kernel map entries, check MAX_KMAPENT");
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me->flags = UVM_MAP_STATIC;
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}
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UVMHIST_LOG(maphist, "<- new entry=0x%x [pageable=%d]",
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me, map->entries_pageable, 0, 0);
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return(me);
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}
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/*
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* uvm_mapent_free: free map entry
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*
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* => XXX: static pool for kernel map?
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*/
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static __inline void
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uvm_mapent_free(me)
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vm_map_entry_t me;
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{
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int s;
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UVMHIST_FUNC("uvm_mapent_free");
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UVMHIST_CALLED(maphist);
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UVMHIST_LOG(maphist,"<- freeing map entry=0x%x [flags=%d]",
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me, me->flags, 0, 0);
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if ((me->flags & UVM_MAP_STATIC) == 0) {
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pool_put(&uvm_map_entry_pool, me);
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} else {
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s = splimp(); /* protect kentry_free list with splimp */
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simple_lock(&uvm.kentry_lock);
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me->next = uvm.kentry_free;
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uvm.kentry_free = me;
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simple_unlock(&uvm.kentry_lock);
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splx(s);
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}
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}
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/*
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* uvm_mapent_copy: copy a map entry, preserving flags
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*/
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static __inline void
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uvm_mapent_copy(src, dst)
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vm_map_entry_t src;
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vm_map_entry_t dst;
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{
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memcpy(dst, src, ((char *)&src->uvm_map_entry_stop_copy) - ((char*)src));
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}
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/*
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* uvm_map_entry_unwire: unwire a map entry
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*
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* => map should be locked by caller
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*/
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static __inline void
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uvm_map_entry_unwire(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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uvm_fault_unwire(map->pmap, entry->start, entry->end);
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entry->wired_count = 0;
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}
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/*
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* uvm_map_init: init mapping system at boot time. note that we allocate
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* and init the static pool of vm_map_entry_t's for the kernel here.
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*/
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void
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uvm_map_init()
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{
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static struct vm_map_entry kernel_map_entry[MAX_KMAPENT];
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#if defined(UVMHIST)
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static struct uvm_history_ent maphistbuf[100];
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static struct uvm_history_ent pdhistbuf[100];
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#endif
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int lcv;
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/*
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* first, init logging system.
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*/
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UVMHIST_FUNC("uvm_map_init");
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UVMHIST_INIT_STATIC(maphist, maphistbuf);
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UVMHIST_INIT_STATIC(pdhist, pdhistbuf);
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UVMHIST_CALLED(maphist);
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UVMHIST_LOG(maphist,"<starting uvm map system>", 0, 0, 0, 0);
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UVMCNT_INIT(uvm_map_call, UVMCNT_CNT, 0,
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"# uvm_map() successful calls", 0);
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UVMCNT_INIT(map_backmerge, UVMCNT_CNT, 0, "# uvm_map() back merges", 0);
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UVMCNT_INIT(map_forwmerge, UVMCNT_CNT, 0, "# uvm_map() missed forward",
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0);
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UVMCNT_INIT(uvm_mlk_call, UVMCNT_CNT, 0, "# map lookup calls", 0);
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UVMCNT_INIT(uvm_mlk_hint, UVMCNT_CNT, 0, "# map lookup hint hits", 0);
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/*
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* now set up static pool of kernel map entrys ...
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*/
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simple_lock_init(&uvm.kentry_lock);
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uvm.kentry_free = NULL;
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for (lcv = 0 ; lcv < MAX_KMAPENT ; lcv++) {
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kernel_map_entry[lcv].next = uvm.kentry_free;
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uvm.kentry_free = &kernel_map_entry[lcv];
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}
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/*
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* initialize the map-related pools.
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*/
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pool_init(&uvm_vmspace_pool, sizeof(struct vmspace),
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0, 0, 0, "vmsppl", 0,
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pool_page_alloc_nointr, pool_page_free_nointr, M_VMMAP);
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pool_init(&uvm_map_entry_pool, sizeof(struct vm_map_entry),
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0, 0, 0, "vmmpepl", 0,
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pool_page_alloc_nointr, pool_page_free_nointr, M_VMMAP);
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}
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/*
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* clippers
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*/
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/*
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* uvm_map_clip_start: ensure that the entry begins at or after
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* the starting address, if it doesn't we split the entry.
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*
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* => caller should use UVM_MAP_CLIP_START macro rather than calling
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* this directly
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* => map must be locked by caller
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*/
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void uvm_map_clip_start(map, entry, start)
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register vm_map_t map;
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register vm_map_entry_t entry;
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register vaddr_t start;
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{
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register vm_map_entry_t new_entry;
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vaddr_t new_adj;
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/* uvm_map_simplify_entry(map, entry); */ /* XXX */
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/*
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* Split off the front portion. note that we must insert the new
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* entry BEFORE this one, so that this entry has the specified
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* starting address.
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*/
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new_entry = uvm_mapent_alloc(map);
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uvm_mapent_copy(entry, new_entry); /* entry -> new_entry */
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new_entry->end = start;
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new_adj = start - new_entry->start;
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if (entry->object.uvm_obj)
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entry->offset += new_adj; /* shift start over */
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entry->start = start;
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if (new_entry->aref.ar_amap) {
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amap_splitref(&new_entry->aref, &entry->aref, new_adj);
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}
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uvm_map_entry_link(map, entry->prev, new_entry);
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if (UVM_ET_ISMAP(entry)) {
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uvm_map_reference(new_entry->object.share_map);
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} else {
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if (UVM_ET_ISOBJ(entry) &&
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entry->object.uvm_obj->pgops &&
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entry->object.uvm_obj->pgops->pgo_reference)
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entry->object.uvm_obj->pgops->pgo_reference(
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entry->object.uvm_obj);
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}
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}
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/*
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* uvm_map_clip_end: ensure that the entry ends at or before
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* the ending address, if it does't we split the reference
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*
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* => caller should use UVM_MAP_CLIP_END macro rather than calling
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* this directly
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* => map must be locked by caller
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*/
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void
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uvm_map_clip_end(map, entry, end)
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vm_map_t map;
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vm_map_entry_t entry;
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vaddr_t end;
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{
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vm_map_entry_t new_entry;
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vaddr_t new_adj; /* #bytes we move start forward */
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/*
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* Create a new entry and insert it
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* AFTER the specified entry
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*/
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new_entry = uvm_mapent_alloc(map);
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uvm_mapent_copy(entry, new_entry); /* entry -> new_entry */
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new_entry->start = entry->end = end;
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new_adj = end - entry->start;
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if (new_entry->object.uvm_obj)
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new_entry->offset += new_adj;
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if (entry->aref.ar_amap)
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amap_splitref(&entry->aref, &new_entry->aref, new_adj);
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uvm_map_entry_link(map, entry, new_entry);
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if (UVM_ET_ISMAP(entry)) {
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uvm_map_reference(new_entry->object.share_map);
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} else {
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if (UVM_ET_ISOBJ(entry) &&
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entry->object.uvm_obj->pgops &&
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entry->object.uvm_obj->pgops->pgo_reference)
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entry->object.uvm_obj->pgops->pgo_reference(
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entry->object.uvm_obj);
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}
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}
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/*
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* M A P - m a i n e n t r y p o i n t
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*/
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/*
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* uvm_map: establish a valid mapping in a map
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*
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* => assume startp is page aligned.
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* => assume size is a multiple of PAGE_SIZE.
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* => assume sys_mmap provides enough of a "hint" to have us skip
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* over text/data/bss area.
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* => map must be unlocked (we will lock it)
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* => <uobj,uoffset> value meanings (4 cases):
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* [1] <NULL,uoffset> == uoffset is a hint for PMAP_PREFER
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* [2] <NULL,UVM_UNKNOWN_OFFSET> == don't PMAP_PREFER
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* [3] <uobj,uoffset> == normal mapping
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* [4] <uobj,UVM_UNKNOWN_OFFSET> == uvm_map finds offset based on VA
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*
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* case [4] is for kernel mappings where we don't know the offset until
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* we've found a virtual address. note that kernel object offsets are
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* always relative to vm_map_min(kernel_map).
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* => XXXCDC: need way to map in external amap?
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*/
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int
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uvm_map(map, startp, size, uobj, uoffset, flags)
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vm_map_t map;
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vaddr_t *startp; /* IN/OUT */
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vsize_t size;
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struct uvm_object *uobj;
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vaddr_t uoffset;
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uvm_flag_t flags;
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{
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vm_map_entry_t prev_entry, new_entry;
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vm_prot_t prot = UVM_PROTECTION(flags), maxprot =
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UVM_MAXPROTECTION(flags);
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vm_inherit_t inherit = UVM_INHERIT(flags);
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int advice = UVM_ADVICE(flags);
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UVMHIST_FUNC("uvm_map");
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UVMHIST_CALLED(maphist);
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UVMHIST_LOG(maphist, "(map=0x%x, *startp=0x%x, size=%d, flags=0x%x)",
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map, *startp, size, flags);
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UVMHIST_LOG(maphist, " uobj/offset 0x%x/%d", uobj, uoffset,0,0);
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/*
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* step 0: sanity check of protection code
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*/
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if ((prot & maxprot) != prot) {
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UVMHIST_LOG(maphist, "<- prot. failure: prot=0x%x, max=0x%x",
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prot, maxprot,0,0);
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return(KERN_PROTECTION_FAILURE);
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}
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/*
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* step 1: figure out where to put new VM range
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*/
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if (vm_map_lock_try(map) == FALSE) {
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if (flags & UVM_FLAG_TRYLOCK)
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return(KERN_FAILURE);
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vm_map_lock(map); /* could sleep here */
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}
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if ((prev_entry = uvm_map_findspace(map, *startp, size, startp,
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uobj, uoffset, flags & UVM_FLAG_FIXED)) == NULL) {
|
|
UVMHIST_LOG(maphist,"<- uvm_map_findspace failed!",0,0,0,0);
|
|
vm_map_unlock(map);
|
|
return (KERN_NO_SPACE);
|
|
}
|
|
|
|
#if defined(PMAP_GROWKERNEL) /* hack */
|
|
{
|
|
/* locked by kernel_map lock */
|
|
static vaddr_t maxkaddr = 0;
|
|
|
|
/*
|
|
* hack: grow kernel PTPs in advance.
|
|
*/
|
|
if (map == kernel_map && maxkaddr < (*startp + size)) {
|
|
pmap_growkernel(*startp + size);
|
|
maxkaddr = *startp + size;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
UVMCNT_INCR(uvm_map_call);
|
|
|
|
/*
|
|
* if uobj is null, then uoffset is either a VAC hint for PMAP_PREFER
|
|
* [typically from uvm_map_reserve] or it is UVM_UNKNOWN_OFFSET. in
|
|
* either case we want to zero it before storing it in the map entry
|
|
* (because it looks strange and confusing when debugging...)
|
|
*
|
|
* if uobj is not null
|
|
* if uoffset is not UVM_UNKNOWN_OFFSET then we have a normal mapping
|
|
* and we do not need to change uoffset.
|
|
* if uoffset is UVM_UNKNOWN_OFFSET then we need to find the offset
|
|
* now (based on the starting address of the map). this case is
|
|
* for kernel object mappings where we don't know the offset until
|
|
* the virtual address is found (with uvm_map_findspace). the
|
|
* offset is the distance we are from the start of the map.
|
|
*/
|
|
|
|
if (uobj == NULL) {
|
|
uoffset = 0;
|
|
} else {
|
|
if (uoffset == UVM_UNKNOWN_OFFSET) {
|
|
#ifdef DIAGNOSTIC
|
|
if (uobj->uo_refs != UVM_OBJ_KERN)
|
|
panic("uvm_map: unknown offset with non-kernel object");
|
|
#endif
|
|
uoffset = *startp - vm_map_min(kernel_map);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* step 2: try and insert in map by extending previous entry, if
|
|
* possible
|
|
* XXX: we don't try and pull back the next entry. might be useful
|
|
* for a stack, but we are currently allocating our stack in advance.
|
|
*/
|
|
|
|
if ((flags & UVM_FLAG_NOMERGE) == 0 &&
|
|
prev_entry->end == *startp && prev_entry != &map->header &&
|
|
prev_entry->object.uvm_obj == uobj) {
|
|
|
|
if (uobj && prev_entry->offset +
|
|
(prev_entry->end - prev_entry->start) != uoffset)
|
|
goto step3;
|
|
|
|
if (UVM_ET_ISMAP(prev_entry))
|
|
goto step3;
|
|
|
|
if (prev_entry->protection != prot ||
|
|
prev_entry->max_protection != maxprot)
|
|
goto step3;
|
|
|
|
if (prev_entry->inheritance != inherit ||
|
|
prev_entry->advice != advice)
|
|
goto step3;
|
|
|
|
/* wired_count's must match (new area is unwired) */
|
|
if (prev_entry->wired_count)
|
|
goto step3;
|
|
|
|
/*
|
|
* can't extend a shared amap. note: no need to lock amap to
|
|
* look at am_ref since we don't care about its exact value.
|
|
* if it is one (i.e. we have only reference) it will stay there
|
|
*/
|
|
|
|
if (prev_entry->aref.ar_amap &&
|
|
prev_entry->aref.ar_amap->am_ref != 1) {
|
|
goto step3;
|
|
}
|
|
|
|
/* got it! */
|
|
|
|
UVMCNT_INCR(map_backmerge);
|
|
UVMHIST_LOG(maphist," starting back merge", 0, 0, 0, 0);
|
|
|
|
/*
|
|
* drop our reference to uobj since we are extending a reference
|
|
* that we already have (the ref count can not drop to zero).
|
|
*/
|
|
if (uobj && uobj->pgops->pgo_detach)
|
|
uobj->pgops->pgo_detach(uobj);
|
|
|
|
if (prev_entry->aref.ar_amap) {
|
|
amap_extend(prev_entry, size);
|
|
}
|
|
|
|
prev_entry->end += size;
|
|
map->size += size;
|
|
|
|
UVMHIST_LOG(maphist,"<- done (via backmerge)!", 0, 0, 0, 0);
|
|
vm_map_unlock(map);
|
|
return (KERN_SUCCESS);
|
|
|
|
}
|
|
step3:
|
|
UVMHIST_LOG(maphist," allocating new map entry", 0, 0, 0, 0);
|
|
|
|
/*
|
|
* check for possible forward merge (which we don't do) and count
|
|
* the number of times we missed a *possible* chance to merge more
|
|
*/
|
|
|
|
if ((flags & UVM_FLAG_NOMERGE) == 0 &&
|
|
prev_entry->next != &map->header &&
|
|
prev_entry->next->start == (*startp + size))
|
|
UVMCNT_INCR(map_forwmerge);
|
|
|
|
/*
|
|
* step 3: allocate new entry and link it in
|
|
*/
|
|
|
|
new_entry = uvm_mapent_alloc(map);
|
|
new_entry->start = *startp;
|
|
new_entry->end = new_entry->start + size;
|
|
new_entry->object.uvm_obj = uobj;
|
|
new_entry->offset = uoffset;
|
|
|
|
if (uobj)
|
|
new_entry->etype = UVM_ET_OBJ;
|
|
else
|
|
new_entry->etype = 0;
|
|
|
|
if (flags & UVM_FLAG_COPYONW) {
|
|
new_entry->etype |= UVM_ET_COPYONWRITE;
|
|
if ((flags & UVM_FLAG_OVERLAY) == 0)
|
|
new_entry->etype |= UVM_ET_NEEDSCOPY;
|
|
}
|
|
|
|
new_entry->protection = prot;
|
|
new_entry->max_protection = maxprot;
|
|
new_entry->inheritance = inherit;
|
|
new_entry->wired_count = 0;
|
|
new_entry->advice = advice;
|
|
if (flags & UVM_FLAG_OVERLAY) {
|
|
/*
|
|
* to_add: for BSS we overallocate a little since we
|
|
* are likely to extend
|
|
*/
|
|
vaddr_t to_add = (flags & UVM_FLAG_AMAPPAD) ?
|
|
UVM_AMAP_CHUNK * PAGE_SIZE : 0;
|
|
struct vm_amap *amap = amap_alloc(size, to_add, M_WAITOK);
|
|
new_entry->aref.ar_slotoff = 0;
|
|
new_entry->aref.ar_amap = amap;
|
|
} else {
|
|
new_entry->aref.ar_amap = NULL;
|
|
}
|
|
|
|
uvm_map_entry_link(map, prev_entry, new_entry);
|
|
|
|
map->size += size;
|
|
|
|
/*
|
|
* Update the free space hint
|
|
*/
|
|
|
|
if ((map->first_free == prev_entry) &&
|
|
(prev_entry->end >= new_entry->start))
|
|
map->first_free = new_entry;
|
|
|
|
UVMHIST_LOG(maphist,"<- done!", 0, 0, 0, 0);
|
|
vm_map_unlock(map);
|
|
return(KERN_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* uvm_map_lookup_entry: find map entry at or before an address
|
|
*
|
|
* => map must at least be read-locked by caller
|
|
* => entry is returned in "entry"
|
|
* => return value is true if address is in the returned entry
|
|
*/
|
|
|
|
boolean_t
|
|
uvm_map_lookup_entry(map, address, entry)
|
|
register vm_map_t map;
|
|
register vaddr_t address;
|
|
vm_map_entry_t *entry; /* OUT */
|
|
{
|
|
register vm_map_entry_t cur;
|
|
register vm_map_entry_t last;
|
|
UVMHIST_FUNC("uvm_map_lookup_entry");
|
|
UVMHIST_CALLED(maphist);
|
|
|
|
UVMHIST_LOG(maphist,"(map=0x%x,addr=0x%x,ent=0x%x)",
|
|
map, address, entry, 0);
|
|
|
|
/*
|
|
* start looking either from the head of the
|
|
* list, or from the hint.
|
|
*/
|
|
|
|
simple_lock(&map->hint_lock);
|
|
cur = map->hint;
|
|
simple_unlock(&map->hint_lock);
|
|
|
|
if (cur == &map->header)
|
|
cur = cur->next;
|
|
|
|
UVMCNT_INCR(uvm_mlk_call);
|
|
if (address >= cur->start) {
|
|
/*
|
|
* go from hint to end of list.
|
|
*
|
|
* but first, make a quick check to see if
|
|
* we are already looking at the entry we
|
|
* want (which is usually the case).
|
|
* note also that we don't need to save the hint
|
|
* here... it is the same hint (unless we are
|
|
* at the header, in which case the hint didn't
|
|
* buy us anything anyway).
|
|
*/
|
|
last = &map->header;
|
|
if ((cur != last) && (cur->end > address)) {
|
|
UVMCNT_INCR(uvm_mlk_hint);
|
|
*entry = cur;
|
|
UVMHIST_LOG(maphist,"<- got it via hint (0x%x)",
|
|
cur, 0, 0, 0);
|
|
return (TRUE);
|
|
}
|
|
} else {
|
|
/*
|
|
* go from start to hint, *inclusively*
|
|
*/
|
|
last = cur->next;
|
|
cur = map->header.next;
|
|
}
|
|
|
|
/*
|
|
* search linearly
|
|
*/
|
|
|
|
while (cur != last) {
|
|
if (cur->end > address) {
|
|
if (address >= cur->start) {
|
|
/*
|
|
* save this lookup for future
|
|
* hints, and return
|
|
*/
|
|
|
|
*entry = cur;
|
|
SAVE_HINT(map, cur);
|
|
UVMHIST_LOG(maphist,"<- search got it (0x%x)",
|
|
cur, 0, 0, 0);
|
|
return (TRUE);
|
|
}
|
|
break;
|
|
}
|
|
cur = cur->next;
|
|
}
|
|
*entry = cur->prev;
|
|
SAVE_HINT(map, *entry);
|
|
UVMHIST_LOG(maphist,"<- failed!",0,0,0,0);
|
|
return (FALSE);
|
|
}
|
|
|
|
|
|
/*
|
|
* uvm_map_findspace: find "length" sized space in "map".
|
|
*
|
|
* => "hint" is a hint about where we want it, unless fixed is true
|
|
* (in which case we insist on using "hint").
|
|
* => "result" is VA returned
|
|
* => uobj/uoffset are to be used to handle VAC alignment, if required
|
|
* => caller must at least have read-locked map
|
|
* => returns NULL on failure, or pointer to prev. map entry if success
|
|
* => note this is a cross between the old vm_map_findspace and vm_map_find
|
|
*/
|
|
|
|
vm_map_entry_t
|
|
uvm_map_findspace(map, hint, length, result, uobj, uoffset, fixed)
|
|
vm_map_t map;
|
|
vaddr_t hint;
|
|
vsize_t length;
|
|
vaddr_t *result; /* OUT */
|
|
struct uvm_object *uobj;
|
|
vaddr_t uoffset;
|
|
boolean_t fixed;
|
|
{
|
|
vm_map_entry_t entry, next, tmp;
|
|
vaddr_t end;
|
|
UVMHIST_FUNC("uvm_map_findspace");
|
|
UVMHIST_CALLED(maphist);
|
|
|
|
UVMHIST_LOG(maphist, "(map=0x%x, hint=0x%x, len=%d, fixed=%d)",
|
|
map, hint, length, fixed);
|
|
|
|
if (hint < map->min_offset) { /* check ranges ... */
|
|
if (fixed) {
|
|
UVMHIST_LOG(maphist,"<- VA below map range",0,0,0,0);
|
|
return(NULL);
|
|
}
|
|
hint = map->min_offset;
|
|
}
|
|
if (hint > map->max_offset) {
|
|
UVMHIST_LOG(maphist,"<- VA 0x%x > range [0x%x->0x%x]",
|
|
hint, map->min_offset, map->max_offset, 0);
|
|
return(NULL);
|
|
}
|
|
|
|
/*
|
|
* Look for the first possible address; if there's already
|
|
* something at this address, we have to start after it.
|
|
*/
|
|
|
|
if (!fixed && hint == map->min_offset) {
|
|
if ((entry = map->first_free) != &map->header)
|
|
hint = entry->end;
|
|
} else {
|
|
if (uvm_map_lookup_entry(map, hint, &tmp)) {
|
|
/* "hint" address already in use ... */
|
|
if (fixed) {
|
|
UVMHIST_LOG(maphist,"<- fixed & VA in use",
|
|
0, 0, 0, 0);
|
|
return(NULL);
|
|
}
|
|
hint = 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.
|
|
* note: entry->end = base VA of current gap,
|
|
* next->start = VA of end of current gap
|
|
*/
|
|
for (;; hint = (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.
|
|
*/
|
|
|
|
#ifdef PMAP_PREFER
|
|
/*
|
|
* push hint forward as needed to avoid VAC alias problems.
|
|
* we only do this if a valid offset is specified.
|
|
*/
|
|
if (!fixed && uoffset != UVM_UNKNOWN_OFFSET)
|
|
PMAP_PREFER(uoffset, &hint);
|
|
#endif
|
|
end = hint + length;
|
|
if (end > map->max_offset || end < hint) {
|
|
UVMHIST_LOG(maphist,"<- failed (off end)", 0,0,0,0);
|
|
return (NULL);
|
|
}
|
|
next = entry->next;
|
|
if (next == &map->header || next->start >= end)
|
|
break;
|
|
if (fixed) {
|
|
UVMHIST_LOG(maphist,"<- fixed mapping failed", 0,0,0,0);
|
|
return(NULL); /* only one shot at it ... */
|
|
}
|
|
}
|
|
SAVE_HINT(map, entry);
|
|
*result = hint;
|
|
UVMHIST_LOG(maphist,"<- got it! (result=0x%x)", hint, 0,0,0);
|
|
return (entry);
|
|
}
|
|
|
|
/*
|
|
* U N M A P - m a i n h e l p e r f u n c t i o n s
|
|
*/
|
|
|
|
/*
|
|
* uvm_unmap_remove: remove mappings from a vm_map (from "start" up to "stop")
|
|
*
|
|
* => caller must check alignment and size
|
|
* => map must be locked by caller
|
|
* => if the "start"/"stop" range lie within a mapping of a share map,
|
|
* then the unmap takes place within the context of that share map
|
|
* rather than in the main map, unless the "mainonly" flag is set.
|
|
* (e.g. the "exit" system call would want to set "mainonly").
|
|
* => we return a list of map entries that we've remove from the map
|
|
* in "entry_list"
|
|
*/
|
|
|
|
int
|
|
uvm_unmap_remove(map, start, end, mainonly, entry_list)
|
|
vm_map_t map;
|
|
vaddr_t start,end;
|
|
boolean_t mainonly;
|
|
vm_map_entry_t *entry_list; /* OUT */
|
|
{
|
|
int result, refs;
|
|
vm_map_entry_t entry, first_entry, next;
|
|
vaddr_t len;
|
|
boolean_t already_removed;
|
|
struct uvm_object *uobj;
|
|
UVMHIST_FUNC("uvm_unmap_remove");
|
|
UVMHIST_CALLED(maphist);
|
|
|
|
UVMHIST_LOG(maphist,"(map=0x%x, start=0x%x, end=0x%x)",
|
|
map, start, end, 0);
|
|
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
/*
|
|
* find first entry
|
|
*/
|
|
if (uvm_map_lookup_entry(map, start, &first_entry) == TRUE) {
|
|
/*
|
|
* start lies within a mapped region. first check to see if
|
|
* it is within a sharemap (in which case we recurse and unmap
|
|
* within the context of the share map).
|
|
*/
|
|
if (UVM_ET_ISMAP(first_entry) &&
|
|
!UVM_ET_ISSUBMAP(first_entry) &&
|
|
mainonly == 0 && end <= first_entry->end) {
|
|
/*
|
|
* is a share map and in range ...
|
|
* XXX: do address transforms if share VA's != main VA's
|
|
* note: main map kept locked during share map unlock
|
|
*/
|
|
result = uvm_unmap(first_entry->object.share_map,
|
|
start, end, 0);
|
|
*entry_list = NULL;
|
|
return(result);
|
|
}
|
|
/* non-share map: clip and go... */
|
|
entry = first_entry;
|
|
UVM_MAP_CLIP_START(map, entry, start);
|
|
/* critical! prevents stale hint */
|
|
SAVE_HINT(map, entry->prev);
|
|
|
|
} else {
|
|
entry = first_entry->next;
|
|
}
|
|
|
|
/*
|
|
* Save the free space hint
|
|
*/
|
|
|
|
if (map->first_free->start >= start)
|
|
map->first_free = entry->prev;
|
|
|
|
/*
|
|
* note: we now re-use first_entry for a different task. we remove
|
|
* a number of map entries from the map and save them in a linked
|
|
* list headed by "first_entry". once we remove them from the map
|
|
* the caller should unlock the map and drop the references to the
|
|
* backing objects [c.f. uvm_unmap_detach]. the object is to
|
|
* seperate unmapping from reference dropping. why?
|
|
* [1] the map has to be locked for unmapping
|
|
* [2] the map need not be locked for reference dropping
|
|
* [3] dropping references may trigger pager I/O, and if we hit
|
|
* a pager that does synchronous I/O we may have to wait for it.
|
|
* [4] we would like all waiting for I/O to occur with maps unlocked
|
|
* so that we don't block other threads.
|
|
*/
|
|
first_entry = NULL;
|
|
*entry_list = NULL; /* to be safe */
|
|
|
|
/*
|
|
* break up the area into map entry sized regions and unmap. note
|
|
* that all mappings have to be removed before we can even consider
|
|
* dropping references to amaps or VM objects (otherwise we could end
|
|
* up with a mapping to a page on the free list which would be very bad)
|
|
*/
|
|
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
|
|
UVM_MAP_CLIP_END(map, entry, end);
|
|
next = entry->next;
|
|
len = entry->end - entry->start;
|
|
|
|
/*
|
|
* unwire before removing addresses from the pmap; otherwise
|
|
* unwiring will put the entries back into the pmap (XXX).
|
|
*/
|
|
|
|
if (entry->wired_count)
|
|
uvm_map_entry_unwire(map, entry);
|
|
|
|
/*
|
|
* special case: handle mappings to anonymous kernel objects.
|
|
* we want to free these pages right away...
|
|
*/
|
|
if (UVM_ET_ISOBJ(entry) &&
|
|
entry->object.uvm_obj->uo_refs == UVM_OBJ_KERN) {
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (vm_map_pmap(map) != pmap_kernel())
|
|
panic("uvm_unmap_remove: kernel object mapped by non-kernel map");
|
|
#endif
|
|
|
|
/*
|
|
* note: kernel object mappings are currently used in
|
|
* two ways:
|
|
* [1] "normal" mappings of pages in the kernel object
|
|
* [2] uvm_km_valloc'd allocations in which we
|
|
* pmap_enter in some non-kernel-object page
|
|
* (e.g. vmapbuf).
|
|
*
|
|
* for case [1], we need to remove the mapping from
|
|
* the pmap and then remove the page from the kernel
|
|
* object (because, once pages in a kernel object are
|
|
* unmapped they are no longer needed, unlike, say,
|
|
* a vnode where you might want the data to persist
|
|
* until flushed out of a queue).
|
|
*
|
|
* for case [2], we need to remove the mapping from
|
|
* the pmap. there shouldn't be any pages at the
|
|
* specified offset in the kernel object [but it
|
|
* doesn't hurt to call uvm_km_pgremove just to be
|
|
* safe?]
|
|
*
|
|
* uvm_km_pgremove currently does the following:
|
|
* for pages in the kernel object in range:
|
|
* - pmap_page_protect them out of all pmaps
|
|
* - uvm_pagefree the page
|
|
*
|
|
* note that in case [1] the pmap_page_protect call
|
|
* in uvm_km_pgremove may very well be redundant
|
|
* because we have already removed the mappings
|
|
* beforehand with pmap_remove (or pmap_kremove).
|
|
* in the PMAP_NEW case, the pmap_page_protect call
|
|
* may not do anything, since PMAP_NEW allows the
|
|
* kernel to enter/remove kernel mappings without
|
|
* bothing to keep track of the mappings (e.g. via
|
|
* pv_entry lists). XXX: because of this, in the
|
|
* future we should consider removing the
|
|
* pmap_page_protect from uvm_km_pgremove some time
|
|
* in the future.
|
|
*/
|
|
|
|
/*
|
|
* remove mappings from pmap
|
|
*/
|
|
#if defined(PMAP_NEW)
|
|
pmap_kremove(entry->start, len);
|
|
#else
|
|
pmap_remove(pmap_kernel(), entry->start,
|
|
entry->start+len);
|
|
#endif
|
|
|
|
/*
|
|
* remove pages from a kernel object (offsets are
|
|
* always relative to vm_map_min(kernel_map)).
|
|
*/
|
|
uvm_km_pgremove(entry->object.uvm_obj,
|
|
entry->start - vm_map_min(kernel_map),
|
|
entry->end - vm_map_min(kernel_map));
|
|
|
|
already_removed = TRUE;
|
|
|
|
/*
|
|
* null out kernel_object reference, we've just
|
|
* dropped it
|
|
*/
|
|
entry->etype &= ~UVM_ET_OBJ;
|
|
entry->object.uvm_obj = NULL; /* to be safe */
|
|
|
|
} else
|
|
already_removed = FALSE;
|
|
|
|
/*
|
|
* remove mappings now. for sharemaps, check to see if
|
|
* the reference count is one (i.e. not being shared right
|
|
* now). if so, use the cheaper pmap_remove() rather than
|
|
* the more expensive share_protect functions.
|
|
*/
|
|
|
|
if (!map->is_main_map) {
|
|
simple_lock(&map->ref_lock);
|
|
refs = map->ref_count;
|
|
simple_unlock(&map->ref_lock);
|
|
}
|
|
#if defined(sparc)
|
|
else
|
|
refs = 0; /* XXX: gcc */
|
|
#endif
|
|
|
|
if (map->is_main_map || (!map->is_main_map && refs == 1)) {
|
|
if (!already_removed)
|
|
pmap_remove(map->pmap, entry->start,
|
|
entry->end);
|
|
} else {
|
|
/* share map... must remove all mappings */
|
|
if (entry->aref.ar_amap) {
|
|
simple_lock(&entry->aref.ar_amap->am_l);
|
|
amap_share_protect(entry, VM_PROT_NONE);
|
|
simple_unlock(&entry->aref.ar_amap->am_l);
|
|
}
|
|
if (UVM_ET_ISOBJ(entry)) {
|
|
uobj = entry->object.uvm_obj;
|
|
simple_lock(&uobj->vmobjlock);
|
|
uobj->pgops->pgo_shareprot(entry, VM_PROT_NONE);
|
|
simple_unlock(&uobj->vmobjlock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* remove from map and put it on our list of entries that
|
|
* we've nuked. then go do next entry.
|
|
*/
|
|
UVMHIST_LOG(maphist, " removed map entry 0x%x", entry, 0, 0,0);
|
|
uvm_map_entry_unlink(map, entry);
|
|
map->size -= len;
|
|
entry->next = first_entry;
|
|
first_entry = entry;
|
|
entry = next; /* next entry, please */
|
|
}
|
|
|
|
/*
|
|
* now we've cleaned up the map and are ready for the caller to drop
|
|
* references to the mapped objects.
|
|
*/
|
|
|
|
*entry_list = first_entry;
|
|
UVMHIST_LOG(maphist,"<- done!", 0, 0, 0, 0);
|
|
return(KERN_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* uvm_unmap_detach: drop references in a chain of map entries
|
|
*
|
|
* => we will free the map entries as we traverse the list.
|
|
*/
|
|
|
|
void
|
|
uvm_unmap_detach(first_entry, amap_unref_flags)
|
|
vm_map_entry_t first_entry;
|
|
int amap_unref_flags;
|
|
{
|
|
vm_map_entry_t next_entry;
|
|
UVMHIST_FUNC("uvm_unmap_detach"); UVMHIST_CALLED(maphist);
|
|
|
|
while (first_entry) {
|
|
|
|
#ifdef DIAGNOSTIC
|
|
/*
|
|
* sanity check
|
|
*/
|
|
/* was part of vm_map_entry_delete() */
|
|
if (first_entry->wired_count)
|
|
panic("unmap: still wired!");
|
|
#endif
|
|
|
|
UVMHIST_LOG(maphist,
|
|
" detach 0x%x: amap=0x%x, obj=0x%x, map?=%d", first_entry,
|
|
first_entry->aref.ar_amap, first_entry->object.uvm_obj,
|
|
UVM_ET_ISMAP(first_entry));
|
|
|
|
/*
|
|
* drop reference to amap, if we've got one
|
|
*/
|
|
|
|
if (first_entry->aref.ar_amap)
|
|
amap_unref(first_entry, amap_unref_flags);
|
|
|
|
/*
|
|
* drop reference to our backing object, if we've got one
|
|
*/
|
|
|
|
if (UVM_ET_ISMAP(first_entry)) {
|
|
uvm_map_deallocate(first_entry->object.share_map);
|
|
} else {
|
|
if (UVM_ET_ISOBJ(first_entry) &&
|
|
first_entry->object.uvm_obj->pgops->pgo_detach)
|
|
first_entry->object.uvm_obj->pgops->
|
|
pgo_detach(first_entry->object.uvm_obj);
|
|
}
|
|
|
|
/*
|
|
* next entry
|
|
*/
|
|
next_entry = first_entry->next;
|
|
uvm_mapent_free(first_entry);
|
|
first_entry = next_entry;
|
|
}
|
|
|
|
/*
|
|
* done!
|
|
*/
|
|
UVMHIST_LOG(maphist, "<- done", 0,0,0,0);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* E X T R A C T I O N F U N C T I O N S
|
|
*/
|
|
|
|
/*
|
|
* uvm_map_reserve: reserve space in a vm_map for future use.
|
|
*
|
|
* => we reserve space in a map by putting a dummy map entry in the
|
|
* map (dummy means obj=NULL, amap=NULL, prot=VM_PROT_NONE)
|
|
* => map should be unlocked (we will write lock it)
|
|
* => we return true if we were able to reserve space
|
|
* => XXXCDC: should be inline?
|
|
*/
|
|
|
|
int
|
|
uvm_map_reserve(map, size, offset, raddr)
|
|
vm_map_t map;
|
|
vsize_t size;
|
|
vaddr_t offset; /* hint for pmap_prefer */
|
|
vaddr_t *raddr; /* OUT: reserved VA */
|
|
{
|
|
UVMHIST_FUNC("uvm_map_reserve"); UVMHIST_CALLED(maphist);
|
|
|
|
UVMHIST_LOG(maphist, "(map=0x%x, size=0x%x, offset=0x%x,addr=0x%x)",
|
|
map,size,offset,raddr);
|
|
|
|
size = round_page(size);
|
|
if (*raddr < vm_map_min(map))
|
|
*raddr = vm_map_min(map); /* hint */
|
|
|
|
/*
|
|
* reserve some virtual space.
|
|
*/
|
|
|
|
if (uvm_map(map, raddr, size, NULL, offset,
|
|
UVM_MAPFLAG(UVM_PROT_NONE, UVM_PROT_NONE, UVM_INH_NONE,
|
|
UVM_ADV_RANDOM, UVM_FLAG_NOMERGE)) != KERN_SUCCESS) {
|
|
UVMHIST_LOG(maphist, "<- done (no VM)", 0,0,0,0);
|
|
return (FALSE);
|
|
}
|
|
|
|
UVMHIST_LOG(maphist, "<- done (*raddr=0x%x)", *raddr,0,0,0);
|
|
return (TRUE);
|
|
}
|
|
|
|
/*
|
|
* uvm_map_replace: replace a reserved (blank) area of memory with
|
|
* real mappings.
|
|
*
|
|
* => caller must WRITE-LOCK the map
|
|
* => we return TRUE if replacement was a success
|
|
* => we expect the newents chain to have nnewents entrys on it and
|
|
* we expect newents->prev to point to the last entry on the list
|
|
* => note newents is allowed to be NULL
|
|
*/
|
|
|
|
int
|
|
uvm_map_replace(map, start, end, newents, nnewents)
|
|
struct vm_map *map;
|
|
vaddr_t start, end;
|
|
vm_map_entry_t newents;
|
|
int nnewents;
|
|
{
|
|
vm_map_entry_t oldent, last;
|
|
UVMHIST_FUNC("uvm_map_replace");
|
|
UVMHIST_CALLED(maphist);
|
|
|
|
/*
|
|
* first find the blank map entry at the specified address
|
|
*/
|
|
|
|
if (!uvm_map_lookup_entry(map, start, &oldent)) {
|
|
return(FALSE);
|
|
}
|
|
|
|
/*
|
|
* check to make sure we have a proper blank entry
|
|
*/
|
|
|
|
if (oldent->start != start || oldent->end != end ||
|
|
oldent->object.uvm_obj != NULL || oldent->aref.ar_amap != NULL) {
|
|
return (FALSE);
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
/*
|
|
* sanity check the newents chain
|
|
*/
|
|
{
|
|
vm_map_entry_t tmpent = newents;
|
|
int nent = 0;
|
|
vaddr_t cur = start;
|
|
|
|
while (tmpent) {
|
|
nent++;
|
|
if (tmpent->start < cur)
|
|
panic("uvm_map_replace1");
|
|
if (tmpent->start > tmpent->end || tmpent->end > end) {
|
|
printf("tmpent->start=0x%lx, tmpent->end=0x%lx, end=0x%lx\n",
|
|
tmpent->start, tmpent->end, end);
|
|
panic("uvm_map_replace2");
|
|
}
|
|
cur = tmpent->end;
|
|
if (tmpent->next) {
|
|
if (tmpent->next->prev != tmpent)
|
|
panic("uvm_map_replace3");
|
|
} else {
|
|
if (newents->prev != tmpent)
|
|
panic("uvm_map_replace4");
|
|
}
|
|
tmpent = tmpent->next;
|
|
}
|
|
if (nent != nnewents)
|
|
panic("uvm_map_replace5");
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* map entry is a valid blank! replace it. (this does all the
|
|
* work of map entry link/unlink...).
|
|
*/
|
|
|
|
if (newents) {
|
|
|
|
last = newents->prev; /* we expect this */
|
|
|
|
/* critical: flush stale hints out of map */
|
|
SAVE_HINT(map, newents);
|
|
if (map->first_free == oldent)
|
|
map->first_free = last;
|
|
|
|
last->next = oldent->next;
|
|
last->next->prev = last;
|
|
newents->prev = oldent->prev;
|
|
newents->prev->next = newents;
|
|
map->nentries = map->nentries + (nnewents - 1);
|
|
|
|
} else {
|
|
|
|
/* critical: flush stale hints out of map */
|
|
SAVE_HINT(map, oldent->prev);
|
|
if (map->first_free == oldent)
|
|
map->first_free = oldent->prev;
|
|
|
|
/* NULL list of new entries: just remove the old one */
|
|
uvm_map_entry_unlink(map, oldent);
|
|
}
|
|
|
|
|
|
/*
|
|
* now we can free the old blank entry, unlock the map and return.
|
|
*/
|
|
|
|
uvm_mapent_free(oldent);
|
|
return(TRUE);
|
|
}
|
|
|
|
/*
|
|
* uvm_map_extract: extract a mapping from a map and put it somewhere
|
|
* (maybe removing the old mapping)
|
|
*
|
|
* => maps should be unlocked (we will write lock them)
|
|
* => returns 0 on success, error code otherwise
|
|
* => start must be page aligned
|
|
* => len must be page sized
|
|
* => flags:
|
|
* UVM_EXTRACT_REMOVE: remove mappings from srcmap
|
|
* UVM_EXTRACT_CONTIG: abort if unmapped area (advisory only)
|
|
* UVM_EXTRACT_QREF: for a temporary extraction do quick obj refs
|
|
* UVM_EXTRACT_FIXPROT: set prot to maxprot as we go
|
|
* >>>NOTE: if you set REMOVE, you are not allowed to use CONTIG or QREF!<<<
|
|
* >>>NOTE: QREF's must be unmapped via the QREF path, thus should only
|
|
* be used from within the kernel in a kernel level map <<<
|
|
*/
|
|
|
|
int
|
|
uvm_map_extract(srcmap, start, len, dstmap, dstaddrp, flags)
|
|
vm_map_t srcmap, dstmap;
|
|
vaddr_t start, *dstaddrp;
|
|
vsize_t len;
|
|
int flags;
|
|
{
|
|
vaddr_t dstaddr, end, newend, oldoffset, fudge, orig_fudge,
|
|
oldstart;
|
|
vm_map_entry_t chain, endchain, entry, orig_entry, newentry, deadentry;
|
|
vm_map_entry_t oldentry;
|
|
vsize_t elen;
|
|
int nchain, error, copy_ok;
|
|
UVMHIST_FUNC("uvm_map_extract"); UVMHIST_CALLED(maphist);
|
|
UVMHIST_LOG(maphist,"(srcmap=0x%x,start=0x%x, len=0x%x", srcmap, start,
|
|
len,0);
|
|
UVMHIST_LOG(maphist," ...,dstmap=0x%x, flags=0x%x)", dstmap,flags,0,0);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
/*
|
|
* step 0: sanity check: start must be on a page boundary, length
|
|
* must be page sized. can't ask for CONTIG/QREF if you asked for
|
|
* REMOVE.
|
|
*/
|
|
if ((start & PAGE_MASK) || (len & PAGE_MASK))
|
|
panic("uvm_map_extract1");
|
|
if (flags & UVM_EXTRACT_REMOVE)
|
|
if (flags & (UVM_EXTRACT_CONTIG|UVM_EXTRACT_QREF))
|
|
panic("uvm_map_extract2");
|
|
#endif
|
|
|
|
|
|
/*
|
|
* step 1: reserve space in the target map for the extracted area
|
|
*/
|
|
|
|
dstaddr = *dstaddrp;
|
|
if (uvm_map_reserve(dstmap, len, start, &dstaddr) == FALSE)
|
|
return(ENOMEM);
|
|
*dstaddrp = dstaddr; /* pass address back to caller */
|
|
UVMHIST_LOG(maphist, " dstaddr=0x%x", dstaddr,0,0,0);
|
|
|
|
|
|
/*
|
|
* step 2: setup for the extraction process loop by init'ing the
|
|
* map entry chain, locking src map, and looking up the first useful
|
|
* entry in the map.
|
|
*/
|
|
|
|
end = start + len;
|
|
newend = dstaddr + len;
|
|
chain = endchain = NULL;
|
|
nchain = 0;
|
|
vm_map_lock(srcmap);
|
|
|
|
if (uvm_map_lookup_entry(srcmap, start, &entry)) {
|
|
|
|
/* "start" is within an entry */
|
|
if (flags & UVM_EXTRACT_QREF) {
|
|
/*
|
|
* for quick references we don't clip the entry, so
|
|
* the entry may map space "before" the starting
|
|
* virtual address... this is the "fudge" factor
|
|
* (which can be non-zero only the first time
|
|
* through the "while" loop in step 3).
|
|
*/
|
|
fudge = start - entry->start;
|
|
} else {
|
|
/*
|
|
* normal reference: we clip the map to fit (thus
|
|
* fudge is zero)
|
|
*/
|
|
UVM_MAP_CLIP_START(srcmap, entry, start);
|
|
SAVE_HINT(srcmap, entry->prev);
|
|
fudge = 0;
|
|
}
|
|
|
|
} else {
|
|
|
|
/* "start" is not within an entry ... skip to next entry */
|
|
if (flags & UVM_EXTRACT_CONTIG) {
|
|
error = EINVAL;
|
|
goto bad; /* definite hole here ... */
|
|
}
|
|
|
|
entry = entry->next;
|
|
fudge = 0;
|
|
}
|
|
/* save values from srcmap for step 6 */
|
|
orig_entry = entry;
|
|
orig_fudge = fudge;
|
|
|
|
|
|
/*
|
|
* step 3: now start looping through the map entries, extracting
|
|
* as we go.
|
|
*/
|
|
|
|
while (entry->start < end && entry != &srcmap->header) {
|
|
|
|
/* if we are not doing a quick reference, clip it */
|
|
if ((flags & UVM_EXTRACT_QREF) == 0)
|
|
UVM_MAP_CLIP_END(srcmap, entry, end);
|
|
|
|
/* clear needs_copy (allow chunking) */
|
|
if (UVM_ET_ISNEEDSCOPY(entry)) {
|
|
if (fudge)
|
|
oldstart = entry->start;
|
|
else
|
|
oldstart = 0; /* XXX: gcc */
|
|
amap_copy(srcmap, entry, M_NOWAIT, TRUE, start, end);
|
|
if (UVM_ET_ISNEEDSCOPY(entry)) { /* failed? */
|
|
error = ENOMEM;
|
|
goto bad;
|
|
}
|
|
/* amap_copy could clip (during chunk)! update fudge */
|
|
if (fudge) {
|
|
fudge = fudge - (entry->start - oldstart);
|
|
orig_fudge = fudge;
|
|
}
|
|
}
|
|
|
|
/* calculate the offset of this from "start" */
|
|
oldoffset = (entry->start + fudge) - start;
|
|
|
|
/* allocate a new map entry */
|
|
newentry = uvm_mapent_alloc(dstmap);
|
|
if (newentry == NULL) {
|
|
error = ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
/* set up new map entry */
|
|
newentry->next = NULL;
|
|
newentry->prev = endchain;
|
|
newentry->start = dstaddr + oldoffset;
|
|
newentry->end =
|
|
newentry->start + (entry->end - (entry->start + fudge));
|
|
if (newentry->end > newend)
|
|
newentry->end = newend;
|
|
newentry->object.uvm_obj = entry->object.uvm_obj;
|
|
if (newentry->object.uvm_obj) {
|
|
if (newentry->object.uvm_obj->pgops->pgo_reference)
|
|
newentry->object.uvm_obj->pgops->
|
|
pgo_reference(newentry->object.uvm_obj);
|
|
newentry->offset = entry->offset + fudge;
|
|
} else {
|
|
newentry->offset = 0;
|
|
}
|
|
newentry->etype = entry->etype;
|
|
newentry->protection = (flags & UVM_EXTRACT_FIXPROT) ?
|
|
entry->max_protection : entry->protection;
|
|
newentry->max_protection = entry->max_protection;
|
|
newentry->inheritance = entry->inheritance;
|
|
newentry->wired_count = 0;
|
|
newentry->aref.ar_amap = entry->aref.ar_amap;
|
|
if (newentry->aref.ar_amap) {
|
|
newentry->aref.ar_slotoff =
|
|
entry->aref.ar_slotoff + (fudge / PAGE_SIZE);
|
|
amap_ref(newentry, AMAP_SHARED |
|
|
((flags & UVM_EXTRACT_QREF) ? AMAP_REFALL : 0));
|
|
} else {
|
|
newentry->aref.ar_slotoff = 0;
|
|
}
|
|
newentry->advice = entry->advice;
|
|
|
|
/* now link it on the chain */
|
|
nchain++;
|
|
if (endchain == NULL) {
|
|
chain = endchain = newentry;
|
|
} else {
|
|
endchain->next = newentry;
|
|
endchain = newentry;
|
|
}
|
|
|
|
/* end of 'while' loop! */
|
|
if ((flags & UVM_EXTRACT_CONTIG) && entry->end < end &&
|
|
(entry->next == &srcmap->header ||
|
|
entry->next->start != entry->end)) {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
entry = entry->next;
|
|
fudge = 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* step 4: close off chain (in format expected by uvm_map_replace)
|
|
*/
|
|
|
|
if (chain)
|
|
chain->prev = endchain;
|
|
|
|
|
|
/*
|
|
* step 5: attempt to lock the dest map so we can pmap_copy.
|
|
* note usage of copy_ok:
|
|
* 1 => dstmap locked, pmap_copy ok, and we "replace" here (step 5)
|
|
* 0 => dstmap unlocked, NO pmap_copy, and we will "replace" in step 7
|
|
*/
|
|
|
|
if (srcmap == dstmap || vm_map_lock_try(dstmap) == TRUE) {
|
|
|
|
copy_ok = 1;
|
|
if (!uvm_map_replace(dstmap, dstaddr, dstaddr+len, chain,
|
|
nchain)) {
|
|
if (srcmap != dstmap)
|
|
vm_map_unlock(dstmap);
|
|
error = EIO;
|
|
goto bad;
|
|
}
|
|
|
|
} else {
|
|
|
|
copy_ok = 0;
|
|
/* replace defered until step 7 */
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
* step 6: traverse the srcmap a second time to do the following:
|
|
* - if we got a lock on the dstmap do pmap_copy
|
|
* - if UVM_EXTRACT_REMOVE remove the entries
|
|
* we make use of orig_entry and orig_fudge (saved in step 2)
|
|
*/
|
|
|
|
if (copy_ok || (flags & UVM_EXTRACT_REMOVE)) {
|
|
|
|
/* purge possible stale hints from srcmap */
|
|
if (flags & UVM_EXTRACT_REMOVE) {
|
|
SAVE_HINT(srcmap, orig_entry->prev);
|
|
if (srcmap->first_free->start >= start)
|
|
srcmap->first_free = orig_entry->prev;
|
|
}
|
|
|
|
entry = orig_entry;
|
|
fudge = orig_fudge;
|
|
deadentry = NULL; /* for UVM_EXTRACT_REMOVE */
|
|
|
|
while (entry->start < end && entry != &srcmap->header) {
|
|
|
|
if (copy_ok) {
|
|
oldoffset = (entry->start + fudge) - start;
|
|
elen = min(end, entry->end) - (entry->start + fudge);
|
|
pmap_copy(dstmap->pmap, srcmap->pmap, dstaddr + oldoffset,
|
|
elen, entry->start + fudge);
|
|
}
|
|
|
|
/* we advance "entry" in the following if statement */
|
|
if (flags & UVM_EXTRACT_REMOVE) {
|
|
pmap_remove(srcmap->pmap, entry->start,
|
|
entry->end);
|
|
oldentry = entry; /* save entry */
|
|
entry = entry->next; /* advance */
|
|
uvm_map_entry_unlink(srcmap, oldentry);
|
|
/* add to dead list */
|
|
oldentry->next = deadentry;
|
|
deadentry = oldentry;
|
|
} else {
|
|
entry = entry->next; /* advance */
|
|
}
|
|
|
|
/* end of 'while' loop */
|
|
fudge = 0;
|
|
}
|
|
|
|
/*
|
|
* unlock dstmap. we will dispose of deadentry in
|
|
* step 7 if needed
|
|
*/
|
|
if (copy_ok && srcmap != dstmap)
|
|
vm_map_unlock(dstmap);
|
|
|
|
}
|
|
else
|
|
deadentry = NULL; /* XXX: gcc */
|
|
|
|
/*
|
|
* step 7: we are done with the source map, unlock. if copy_ok
|
|
* is 0 then we have not replaced the dummy mapping in dstmap yet
|
|
* and we need to do so now.
|
|
*/
|
|
|
|
vm_map_unlock(srcmap);
|
|
if ((flags & UVM_EXTRACT_REMOVE) && deadentry)
|
|
uvm_unmap_detach(deadentry, 0); /* dispose of old entries */
|
|
|
|
/* now do the replacement if we didn't do it in step 5 */
|
|
if (copy_ok == 0) {
|
|
vm_map_lock(dstmap);
|
|
error = uvm_map_replace(dstmap, dstaddr, dstaddr+len, chain,
|
|
nchain);
|
|
vm_map_unlock(dstmap);
|
|
|
|
if (error == FALSE) {
|
|
error = EIO;
|
|
goto bad2;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* done!
|
|
*/
|
|
return(0);
|
|
|
|
/*
|
|
* bad: failure recovery
|
|
*/
|
|
bad:
|
|
vm_map_unlock(srcmap);
|
|
bad2: /* src already unlocked */
|
|
if (chain)
|
|
uvm_unmap_detach(chain,
|
|
(flags & UVM_EXTRACT_QREF) ? AMAP_REFALL : 0);
|
|
uvm_unmap(dstmap, dstaddr, dstaddr+len, 1); /* ??? */
|
|
return(error);
|
|
}
|
|
|
|
/* end of extraction functions */
|
|
|
|
/*
|
|
* uvm_map_submap: punch down part of a map into a submap
|
|
*
|
|
* => only the kernel_map is allowed to be submapped
|
|
* => the purpose of submapping is to break up the locking granularity
|
|
* of a larger map
|
|
* => the range specified must have been mapped previously with a uvm_map()
|
|
* call [with uobj==NULL] to create a blank map entry in the main map.
|
|
* [And it had better still be blank!]
|
|
* => maps which contain submaps should never be copied or forked.
|
|
* => to remove a submap, use uvm_unmap() on the main map
|
|
* and then uvm_map_deallocate() the submap.
|
|
* => main map must be unlocked.
|
|
* => submap must have been init'd and have a zero reference count.
|
|
* [need not be locked as we don't actually reference it]
|
|
*/
|
|
|
|
int
|
|
uvm_map_submap(map, start, end, submap)
|
|
vm_map_t map, submap;
|
|
vaddr_t start, end;
|
|
{
|
|
vm_map_entry_t entry;
|
|
int result;
|
|
UVMHIST_FUNC("uvm_map_submap"); UVMHIST_CALLED(maphist);
|
|
|
|
vm_map_lock(map);
|
|
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
if (uvm_map_lookup_entry(map, start, &entry)) {
|
|
UVM_MAP_CLIP_START(map, entry, start);
|
|
UVM_MAP_CLIP_END(map, entry, end); /* to be safe */
|
|
}
|
|
else {
|
|
entry = NULL;
|
|
}
|
|
|
|
if (entry != NULL &&
|
|
entry->start == start && entry->end == end &&
|
|
entry->object.uvm_obj == NULL && entry->aref.ar_amap == NULL &&
|
|
!UVM_ET_ISCOPYONWRITE(entry) && !UVM_ET_ISNEEDSCOPY(entry)) {
|
|
|
|
/*
|
|
* doit!
|
|
*/
|
|
entry->etype |= (UVM_ET_MAP|UVM_ET_SUBMAP);
|
|
entry->object.sub_map = submap;
|
|
entry->offset = 0;
|
|
uvm_map_reference(submap);
|
|
result = KERN_SUCCESS;
|
|
} else {
|
|
result = KERN_INVALID_ARGUMENT;
|
|
}
|
|
vm_map_unlock(map);
|
|
|
|
return(result);
|
|
}
|
|
|
|
|
|
/*
|
|
* uvm_map_protect: change map protection
|
|
*
|
|
* => set_max means set max_protection.
|
|
* => map must be unlocked.
|
|
* => XXXCDC: does not work properly with share maps. rethink.
|
|
*/
|
|
|
|
#define MASK(entry) ( UVM_ET_ISCOPYONWRITE(entry) ? \
|
|
~VM_PROT_WRITE : VM_PROT_ALL)
|
|
#define max(a,b) ((a) > (b) ? (a) : (b))
|
|
|
|
int
|
|
uvm_map_protect(map, start, end, new_prot, set_max)
|
|
vm_map_t map;
|
|
vaddr_t start, end;
|
|
vm_prot_t new_prot;
|
|
boolean_t set_max;
|
|
{
|
|
vm_map_entry_t current, entry;
|
|
UVMHIST_FUNC("uvm_map_protect"); UVMHIST_CALLED(maphist);
|
|
UVMHIST_LOG(maphist,"(map=0x%x,start=0x%x,end=0x%x,new_prot=0x%x)",
|
|
map, start, end, new_prot);
|
|
|
|
vm_map_lock(map);
|
|
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
if (uvm_map_lookup_entry(map, start, &entry)) {
|
|
UVM_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 (UVM_ET_ISSUBMAP(current))
|
|
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 (no need to clip this time). */
|
|
|
|
current = entry;
|
|
|
|
while ((current != &map->header) && (current->start < end)) {
|
|
vm_prot_t old_prot;
|
|
|
|
UVM_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) {
|
|
if (UVM_ET_ISMAP(current) &&
|
|
!UVM_ET_ISSUBMAP(current)) {
|
|
/* share map? gotta go down a level */
|
|
vm_map_entry_t share_entry;
|
|
vaddr_t share_end;
|
|
|
|
/*
|
|
* note: a share map has its own address
|
|
* space (starting at zero). current->offset
|
|
* is the offset into the share map our
|
|
* mapping starts. the length of our
|
|
* mapping is (current->end - current->start).
|
|
* thus, our mapping goes from current->offset
|
|
* to share_end (which is: current->offset +
|
|
* length) in the share map's address space.
|
|
*
|
|
* thus for any share_entry we need to make
|
|
* sure that the addresses we've got fall in
|
|
* the range we want. we use:
|
|
* max(any share_entry->start, current->offset)
|
|
* min(any share_entry->end, share_end)
|
|
*
|
|
* of course to change our pmap we've got to
|
|
* convert the share * map address back to
|
|
* our map's virtual address space using:
|
|
* our_va = share_va -
|
|
* current->offset + current->start
|
|
*
|
|
* XXXCDC: protection change in sharemap may
|
|
* require use of pmap_page_protect. needs
|
|
* a rethink.
|
|
*/
|
|
|
|
vm_map_lock(current->object.share_map);
|
|
/*
|
|
* note: current->offset is offset into
|
|
* share map
|
|
*/
|
|
(void)uvm_map_lookup_entry(
|
|
current->object.share_map,
|
|
current->offset, &share_entry);
|
|
share_end = current->offset +
|
|
(current->end - current->start);
|
|
while ((share_entry !=
|
|
¤t->object.share_map->header) &&
|
|
(share_entry->start < share_end)) {
|
|
|
|
pmap_protect(map->pmap,
|
|
(max(share_entry->start,
|
|
current->offset) -
|
|
current->offset + current->start),
|
|
min(share_entry->end, share_end) -
|
|
current->offset + current->start,
|
|
current->protection &
|
|
MASK(share_entry));
|
|
|
|
share_entry = share_entry->next;
|
|
}
|
|
vm_map_unlock(current->object.share_map);
|
|
|
|
} else { /* not share map! */
|
|
|
|
pmap_protect(map->pmap, current->start,
|
|
current->end,
|
|
current->protection & MASK(entry));
|
|
|
|
}
|
|
}
|
|
current = current->next;
|
|
}
|
|
|
|
vm_map_unlock(map);
|
|
UVMHIST_LOG(maphist, "<- done",0,0,0,0);
|
|
return(KERN_SUCCESS);
|
|
}
|
|
|
|
#undef max
|
|
#undef MASK
|
|
|
|
/*
|
|
* uvm_map_inherit: set inheritance code for range of addrs in map.
|
|
*
|
|
* => map must be unlocked
|
|
* => note that the inherit code is used during a "fork". see fork
|
|
* code for details.
|
|
* => XXXCDC: currently only works in main map. what about share map?
|
|
*/
|
|
|
|
int
|
|
uvm_map_inherit(map, start, end, new_inheritance)
|
|
vm_map_t map;
|
|
vaddr_t start;
|
|
vaddr_t end;
|
|
vm_inherit_t new_inheritance;
|
|
{
|
|
vm_map_entry_t entry, temp_entry;
|
|
UVMHIST_FUNC("uvm_map_inherit"); UVMHIST_CALLED(maphist);
|
|
UVMHIST_LOG(maphist,"(map=0x%x,start=0x%x,end=0x%x,new_inh=0x%x)",
|
|
map, start, end, new_inheritance);
|
|
|
|
switch (new_inheritance) {
|
|
case VM_INHERIT_NONE:
|
|
case VM_INHERIT_COPY:
|
|
case VM_INHERIT_SHARE:
|
|
break;
|
|
default:
|
|
UVMHIST_LOG(maphist,"<- done (INVALID ARG)",0,0,0,0);
|
|
return(KERN_INVALID_ARGUMENT);
|
|
}
|
|
|
|
vm_map_lock(map);
|
|
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
if (uvm_map_lookup_entry(map, start, &temp_entry)) {
|
|
entry = temp_entry;
|
|
UVM_MAP_CLIP_START(map, entry, start);
|
|
} else {
|
|
entry = temp_entry->next;
|
|
}
|
|
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
UVM_MAP_CLIP_END(map, entry, end);
|
|
|
|
entry->inheritance = new_inheritance;
|
|
|
|
entry = entry->next;
|
|
}
|
|
|
|
vm_map_unlock(map);
|
|
UVMHIST_LOG(maphist,"<- done (OK)",0,0,0,0);
|
|
return(KERN_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* uvm_map_pageable: sets the pageability of a range in a map.
|
|
*
|
|
* => regions sepcified as not pageable require lock-down (wired) memory
|
|
* and page tables.
|
|
* => map must not be locked.
|
|
* => XXXCDC: check this and try and clean it up.
|
|
*/
|
|
|
|
int
|
|
uvm_map_pageable(map, start, end, new_pageable)
|
|
vm_map_t map;
|
|
vaddr_t start, end;
|
|
boolean_t new_pageable;
|
|
{
|
|
vm_map_entry_t entry, start_entry;
|
|
vaddr_t failed = 0;
|
|
int rv;
|
|
UVMHIST_FUNC("uvm_map_pageable"); UVMHIST_CALLED(maphist);
|
|
UVMHIST_LOG(maphist,"(map=0x%x,start=0x%x,end=0x%x,new_pageable=0x%x)",
|
|
map, start, end, new_pageable);
|
|
|
|
vm_map_lock(map);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
|
|
/*
|
|
* only one pageability change may take place at one time, since
|
|
* uvm_fault_wire 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 (uvm_map_lookup_entry(map, start, &start_entry) == FALSE) {
|
|
vm_map_unlock(map);
|
|
|
|
UVMHIST_LOG(maphist,"<- done (INVALID ARG)",0,0,0,0);
|
|
return (KERN_INVALID_ADDRESS);
|
|
}
|
|
entry = start_entry;
|
|
|
|
/*
|
|
* handle wiring and unwiring seperately.
|
|
*/
|
|
|
|
if (new_pageable) { /* unwire */
|
|
|
|
UVM_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);
|
|
UVMHIST_LOG(maphist,
|
|
"<- done (INVALID UNWIRE ARG)",0,0,0,0);
|
|
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.
|
|
*/
|
|
#if 0 /* not necessary: uvm_fault_unwire does not lock */
|
|
lock_set_recursive(&map->lock);
|
|
#endif /* XXXCDC */
|
|
|
|
entry = start_entry;
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
UVM_MAP_CLIP_END(map, entry, end);
|
|
|
|
entry->wired_count--;
|
|
if (entry->wired_count == 0)
|
|
uvm_map_entry_unwire(map, entry);
|
|
|
|
entry = entry->next;
|
|
}
|
|
#if 0 /* XXXCDC: not necessary, see above */
|
|
lock_clear_recursive(&map->lock);
|
|
#endif
|
|
vm_map_unlock(map);
|
|
UVMHIST_LOG(maphist,"<- done (OK UNWIRE)",0,0,0,0);
|
|
return(KERN_SUCCESS);
|
|
|
|
/*
|
|
* end of unwire case!
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* wire case: in two passes [XXXCDC: ugly block of code here]
|
|
*
|
|
* 1: holding the write lock, we create any anonymous maps that need
|
|
* to be created. then we clip each map entry to the region to
|
|
* be wired and increment its wiring count.
|
|
*
|
|
* 2: we downgrade to a read lock, and call uvm_fault_wire to fault
|
|
* in the pages for any newly wired area (wired_count is 1).
|
|
*
|
|
* downgrading to a read lock for uvm_fault_wire avoids a possible
|
|
* deadlock with another thread 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.
|
|
*/
|
|
|
|
while ((entry != &map->header) && (entry->start < end)) {
|
|
|
|
if (entry->wired_count == 0) { /* not already wired? */
|
|
|
|
/*
|
|
* perform actions of vm_map_lookup that need the
|
|
* write lock on the map: create an anonymous map
|
|
* for a copy-on-write region, or an anonymous map
|
|
* for a zero-fill region.
|
|
*
|
|
* we don't have to do this for entries that point
|
|
* to sharing maps, because we won't hold the lock
|
|
* on the sharing map.
|
|
*/
|
|
|
|
if (!UVM_ET_ISMAP(entry)) { /* not sharing map */
|
|
/*
|
|
* XXXCDC: protection vs. max_protection??
|
|
* (wirefault uses max?)
|
|
* XXXCDC: used to do it always if
|
|
* uvm_obj == NULL (wrong?)
|
|
*/
|
|
if ( UVM_ET_ISNEEDSCOPY(entry) &&
|
|
(entry->protection & VM_PROT_WRITE) != 0) {
|
|
amap_copy(map, entry, M_WAITOK, TRUE,
|
|
start, end);
|
|
/* XXXCDC: wait OK? */
|
|
}
|
|
}
|
|
} /* wired_count == 0 */
|
|
UVM_MAP_CLIP_START(map, entry, start);
|
|
UVM_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. amap 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);
|
|
UVMHIST_LOG(maphist,"<- done (INVALID WIRE)",0,0,0,0);
|
|
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 threads are
|
|
* well-behaved, and therefore will not do anything destructive to
|
|
* this region of the map while we have it unlocked. we cannot
|
|
* trust user threads to do the same.
|
|
*
|
|
* HACK HACK HACK HACK
|
|
*/
|
|
if (vm_map_pmap(map) == pmap_kernel()) {
|
|
vm_map_unlock(map); /* trust me ... */
|
|
} else {
|
|
vm_map_set_recursive(&map->lock);
|
|
lockmgr(&map->lock, LK_DOWNGRADE, (void *)0);
|
|
}
|
|
|
|
rv = 0;
|
|
entry = start_entry;
|
|
while (entry != &map->header && entry->start < end) {
|
|
/*
|
|
* if uvm_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. [because we only have a read lock on map we
|
|
* shouldn't be changing wired_count?]
|
|
*/
|
|
if (rv) {
|
|
entry->wired_count--;
|
|
} else if (entry->wired_count == 1) {
|
|
rv = uvm_fault_wire(map, entry->start, entry->end);
|
|
if (rv) {
|
|
failed = entry->start;
|
|
entry->wired_count--;
|
|
}
|
|
}
|
|
entry = entry->next;
|
|
}
|
|
|
|
if (vm_map_pmap(map) == pmap_kernel()) {
|
|
vm_map_lock(map); /* relock */
|
|
} else {
|
|
vm_map_clear_recursive(&map->lock);
|
|
}
|
|
|
|
if (rv) { /* failed? */
|
|
vm_map_unlock(map);
|
|
(void) uvm_map_pageable(map, start, failed, TRUE);
|
|
UVMHIST_LOG(maphist, "<- done (RV=%d)", rv,0,0,0);
|
|
return(rv);
|
|
}
|
|
vm_map_unlock(map);
|
|
|
|
UVMHIST_LOG(maphist,"<- done (OK WIRE)",0,0,0,0);
|
|
return(KERN_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* uvm_map_clean: push dirty pages off to backing store.
|
|
*
|
|
* => valid flags:
|
|
* if (flags & PGO_SYNCIO): dirty pages are written synchronously
|
|
* if (flags & PGO_DEACTIVATE): any cached pages are deactivated after clean
|
|
* if (flags & PGO_FREE): any cached pages are freed after clean
|
|
* => returns an error if any part of the specified range isn't mapped
|
|
* => never a need to flush amap layer since the anonymous memory has
|
|
* no permanent home...
|
|
* => called from sys_msync()
|
|
* => caller must not write-lock map (read OK).
|
|
* => we may sleep while cleaning if SYNCIO [with map read-locked]
|
|
* => XXX: does this handle share maps properly?
|
|
*/
|
|
|
|
int
|
|
uvm_map_clean(map, start, end, flags)
|
|
vm_map_t map;
|
|
vaddr_t start, end;
|
|
int flags;
|
|
{
|
|
vm_map_entry_t current;
|
|
vm_map_entry_t entry;
|
|
vsize_t size;
|
|
struct uvm_object *object;
|
|
vaddr_t offset;
|
|
UVMHIST_FUNC("uvm_map_clean"); UVMHIST_CALLED(maphist);
|
|
UVMHIST_LOG(maphist,"(map=0x%x,start=0x%x,end=0x%x,flags=0x%x)",
|
|
map, start, end, flags);
|
|
|
|
vm_map_lock_read(map);
|
|
VM_MAP_RANGE_CHECK(map, start, end);
|
|
if (!uvm_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 (UVM_ET_ISSUBMAP(current)) {
|
|
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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* add "cleanit" flag to flags (for generic flush routine).
|
|
* then make a second pass, cleaning/uncaching pages from
|
|
* the indicated objects as we go.
|
|
*/
|
|
flags = flags | PGO_CLEANIT;
|
|
for (current = entry; current->start < end; current = current->next) {
|
|
offset = current->offset + (start - current->start);
|
|
size = (end <= current->end ? end : current->end) - start;
|
|
|
|
/*
|
|
* get object/offset. special case to handle share maps.
|
|
*/
|
|
if (UVM_ET_ISMAP(current)) { /* share map? */
|
|
register vm_map_t smap;
|
|
vm_map_entry_t tentry;
|
|
vsize_t tsize;
|
|
|
|
smap = current->object.share_map;
|
|
vm_map_lock_read(smap);
|
|
(void) uvm_map_lookup_entry(smap, offset, &tentry);
|
|
tsize = tentry->end - offset;
|
|
if (tsize < size)
|
|
size = tsize;
|
|
object = tentry->object.uvm_obj;
|
|
offset = tentry->offset + (offset - tentry->start);
|
|
simple_lock(&object->vmobjlock);
|
|
vm_map_unlock_read(smap);
|
|
} else {
|
|
object = current->object.uvm_obj;
|
|
simple_lock(&object->vmobjlock);
|
|
}
|
|
|
|
/*
|
|
* flush pages if writing is allowed. note that object is
|
|
* locked.
|
|
* XXX should we continue on an error?
|
|
*/
|
|
|
|
if (object && object->pgops &&
|
|
(current->protection & VM_PROT_WRITE) != 0) {
|
|
if (!object->pgops->pgo_flush(object, offset,
|
|
offset+size, flags)) {
|
|
simple_unlock(&object->vmobjlock);
|
|
vm_map_unlock_read(map);
|
|
return (KERN_FAILURE);
|
|
}
|
|
}
|
|
simple_unlock(&object->vmobjlock);
|
|
start += size;
|
|
}
|
|
vm_map_unlock_read(map);
|
|
return(KERN_SUCCESS);
|
|
}
|
|
|
|
|
|
/*
|
|
* uvm_map_checkprot: check protection in map
|
|
*
|
|
* => must allow specified protection in a fully allocated region.
|
|
* => map must be read or write locked by caller.
|
|
*/
|
|
|
|
boolean_t
|
|
uvm_map_checkprot(map, start, end, protection)
|
|
vm_map_t map;
|
|
vaddr_t start, end;
|
|
vm_prot_t protection;
|
|
{
|
|
vm_map_entry_t entry;
|
|
vm_map_entry_t tmp_entry;
|
|
|
|
if (!uvm_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);
|
|
}
|
|
|
|
/*
|
|
* uvmspace_alloc: allocate a vmspace structure.
|
|
*
|
|
* - structure includes vm_map and pmap
|
|
* - XXX: no locking on this structure
|
|
* - refcnt set to 1, rest must be init'd by caller
|
|
*/
|
|
struct vmspace *
|
|
uvmspace_alloc(min, max, pageable)
|
|
vaddr_t min, max;
|
|
int pageable;
|
|
{
|
|
struct vmspace *vm;
|
|
UVMHIST_FUNC("uvmspace_alloc"); UVMHIST_CALLED(maphist);
|
|
|
|
vm = pool_get(&uvm_vmspace_pool, PR_WAITOK);
|
|
uvmspace_init(vm, NULL, min, max, pageable);
|
|
UVMHIST_LOG(maphist,"<- done (vm=0x%x)", vm,0,0,0);
|
|
return (vm);
|
|
}
|
|
|
|
/*
|
|
* uvmspace_init: initialize a vmspace structure.
|
|
*
|
|
* - XXX: no locking on this structure
|
|
* - refcnt set to 1, rest must me init'd by caller
|
|
*/
|
|
void
|
|
uvmspace_init(vm, pmap, min, max, pageable)
|
|
struct vmspace *vm;
|
|
struct pmap *pmap;
|
|
vaddr_t min, max;
|
|
boolean_t pageable;
|
|
{
|
|
UVMHIST_FUNC("uvmspace_init"); UVMHIST_CALLED(maphist);
|
|
|
|
memset(vm, 0, sizeof(*vm));
|
|
|
|
uvm_map_setup(&vm->vm_map, min, max, pageable);
|
|
|
|
if (pmap)
|
|
pmap_reference(pmap);
|
|
else
|
|
#if defined(PMAP_NEW)
|
|
pmap = pmap_create();
|
|
#else
|
|
pmap = pmap_create(0);
|
|
#endif
|
|
vm->vm_map.pmap = pmap;
|
|
|
|
vm->vm_refcnt = 1;
|
|
UVMHIST_LOG(maphist,"<- done",0,0,0,0);
|
|
}
|
|
|
|
/*
|
|
* uvmspace_share: share a vmspace between two proceses
|
|
*
|
|
* - XXX: no locking on vmspace
|
|
* - used for vfork, threads(?)
|
|
*/
|
|
|
|
void
|
|
uvmspace_share(p1, p2)
|
|
struct proc *p1, *p2;
|
|
{
|
|
p2->p_vmspace = p1->p_vmspace;
|
|
p1->p_vmspace->vm_refcnt++;
|
|
}
|
|
|
|
/*
|
|
* uvmspace_unshare: ensure that process "p" has its own, unshared, vmspace
|
|
*
|
|
* - XXX: no locking on vmspace
|
|
*/
|
|
|
|
void
|
|
uvmspace_unshare(p)
|
|
struct proc *p;
|
|
{
|
|
struct vmspace *nvm, *ovm = p->p_vmspace;
|
|
int s;
|
|
|
|
if (ovm->vm_refcnt == 1)
|
|
/* nothing to do: vmspace isn't shared in the first place */
|
|
return;
|
|
|
|
/* make a new vmspace, still holding old one */
|
|
nvm = uvmspace_fork(ovm);
|
|
|
|
s = splhigh(); /* make this `atomic' */
|
|
pmap_deactivate(p); /* unbind old vmspace */
|
|
p->p_vmspace = nvm;
|
|
pmap_activate(p); /* switch to new vmspace */
|
|
splx(s); /* end of critical section */
|
|
|
|
uvmspace_free(ovm); /* drop reference to old vmspace */
|
|
}
|
|
|
|
/*
|
|
* uvmspace_exec: the process wants to exec a new program
|
|
*
|
|
* - XXX: no locking on vmspace
|
|
*/
|
|
|
|
void
|
|
uvmspace_exec(p)
|
|
struct proc *p;
|
|
{
|
|
struct vmspace *nvm, *ovm = p->p_vmspace;
|
|
vm_map_t map = &ovm->vm_map;
|
|
int s;
|
|
|
|
#ifdef sparc
|
|
/* XXX cgd 960926: the sparc #ifdef should be a MD hook */
|
|
kill_user_windows(p); /* before stack addresses go away */
|
|
#endif
|
|
|
|
/*
|
|
* see if more than one process is using this vmspace...
|
|
*/
|
|
|
|
if (ovm->vm_refcnt == 1) {
|
|
|
|
/*
|
|
* if p is the only process using its vmspace then we can safely
|
|
* recycle that vmspace for the program that is being exec'd.
|
|
*/
|
|
|
|
#ifdef SYSVSHM
|
|
/*
|
|
* SYSV SHM semantics require us to kill all segments on an exec
|
|
*/
|
|
if (ovm->vm_shm)
|
|
shmexit(ovm);
|
|
#endif
|
|
|
|
/*
|
|
* now unmap the old program
|
|
*/
|
|
uvm_unmap(map, VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS, 0);
|
|
|
|
} else {
|
|
|
|
/*
|
|
* p's vmspace is being shared, so we can't reuse it for p since
|
|
* it is still being used for others. allocate a new vmspace
|
|
* for p
|
|
*/
|
|
nvm = uvmspace_alloc(map->min_offset, map->max_offset,
|
|
map->entries_pageable);
|
|
|
|
#if (defined(i386) || defined(pc532)) && !defined(PMAP_NEW)
|
|
/*
|
|
* allocate zero fill area in the new vmspace's map for user
|
|
* page tables for ports that have old style pmaps that keep
|
|
* user page tables in the top part of the process' address
|
|
* space.
|
|
*
|
|
* XXXCDC: this should go away once all pmaps are fixed
|
|
*/
|
|
{
|
|
vaddr_t addr = VM_MAXUSER_ADDRESS;
|
|
if (uvm_map(&nvm->vm_map, &addr, VM_MAX_ADDRESS - addr,
|
|
NULL, UVM_UNKNOWN_OFFSET, UVM_MAPFLAG(UVM_PROT_ALL,
|
|
UVM_PROT_ALL, UVM_INH_NONE, UVM_ADV_NORMAL,
|
|
UVM_FLAG_FIXED|UVM_FLAG_COPYONW)) != KERN_SUCCESS)
|
|
panic("vm_allocate of PT page area failed");
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* install new vmspace and drop our ref to the old one.
|
|
*/
|
|
|
|
s = splhigh();
|
|
pmap_deactivate(p);
|
|
p->p_vmspace = nvm;
|
|
pmap_activate(p);
|
|
splx(s);
|
|
|
|
uvmspace_free(ovm);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* uvmspace_free: free a vmspace data structure
|
|
*
|
|
* - XXX: no locking on vmspace
|
|
*/
|
|
|
|
void
|
|
uvmspace_free(vm)
|
|
struct vmspace *vm;
|
|
{
|
|
vm_map_entry_t dead_entries;
|
|
UVMHIST_FUNC("uvmspace_free"); UVMHIST_CALLED(maphist);
|
|
|
|
UVMHIST_LOG(maphist,"(vm=0x%x) ref=%d", vm, vm->vm_refcnt,0,0);
|
|
if (--vm->vm_refcnt == 0) {
|
|
/*
|
|
* lock the map, to wait out all other references to it. delete
|
|
* all of the mappings and pages they hold, then call the pmap
|
|
* module to reclaim anything left.
|
|
*/
|
|
vm_map_lock(&vm->vm_map);
|
|
if (vm->vm_map.nentries) {
|
|
(void)uvm_unmap_remove(&vm->vm_map,
|
|
vm->vm_map.min_offset, vm->vm_map.max_offset,
|
|
TRUE, &dead_entries);
|
|
if (dead_entries != NULL)
|
|
uvm_unmap_detach(dead_entries, 0);
|
|
}
|
|
pmap_destroy(vm->vm_map.pmap);
|
|
vm->vm_map.pmap = NULL;
|
|
pool_put(&uvm_vmspace_pool, vm);
|
|
}
|
|
UVMHIST_LOG(maphist,"<- done", 0,0,0,0);
|
|
}
|
|
|
|
/*
|
|
* F O R K - m a i n e n t r y p o i n t
|
|
*/
|
|
/*
|
|
* uvmspace_fork: fork a process' main map
|
|
*
|
|
* => create a new vmspace for child process from parent.
|
|
* => parent's map must not be locked.
|
|
*/
|
|
|
|
struct vmspace *
|
|
uvmspace_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;
|
|
pmap_t new_pmap;
|
|
boolean_t protect_child;
|
|
UVMHIST_FUNC("uvmspace_fork"); UVMHIST_CALLED(maphist);
|
|
|
|
#if (defined(i386) || defined(pc532)) && !defined(PMAP_NEW)
|
|
/*
|
|
* avoid copying any of the parent's pagetables or other per-process
|
|
* objects that reside in the map by marking all of them non-inheritable
|
|
* XXXCDC: should go away
|
|
*/
|
|
(void) uvm_map_inherit(old_map, VM_MAXUSER_ADDRESS, VM_MAX_ADDRESS,
|
|
VM_INHERIT_NONE);
|
|
#endif
|
|
|
|
vm_map_lock(old_map);
|
|
|
|
vm2 = uvmspace_alloc(old_map->min_offset, old_map->max_offset,
|
|
old_map->entries_pageable);
|
|
memcpy(&vm2->vm_startcopy, &vm1->vm_startcopy,
|
|
(caddr_t) (vm1 + 1) - (caddr_t) &vm1->vm_startcopy);
|
|
new_map = &vm2->vm_map; /* XXX */
|
|
new_pmap = new_map->pmap;
|
|
|
|
old_entry = old_map->header.next;
|
|
|
|
/*
|
|
* go entry-by-entry
|
|
*/
|
|
|
|
while (old_entry != &old_map->header) {
|
|
|
|
/*
|
|
* first, some sanity checks on the old entry
|
|
*/
|
|
if (UVM_ET_ISSUBMAP(old_entry))
|
|
panic("fork: encountered a submap during fork (illegal)");
|
|
else if (UVM_ET_ISMAP(old_entry)) {
|
|
if (UVM_ET_ISNEEDSCOPY(old_entry))
|
|
panic("fork: encountered a share map entry that needs_copy (illegal)");
|
|
if (UVM_ET_ISCOPYONWRITE(old_entry))
|
|
panic("fork: encountered a copy_on_write share map entry (illegal)");
|
|
if (old_entry->aref.ar_amap)
|
|
panic("fork: detected share map entry that has an amap (illegal)");
|
|
} else {
|
|
if (!UVM_ET_ISCOPYONWRITE(old_entry) &&
|
|
UVM_ET_ISNEEDSCOPY(old_entry))
|
|
panic("fork: non-copy_on_write map entry marked needs_copy (illegal)");
|
|
}
|
|
|
|
|
|
switch (old_entry->inheritance) {
|
|
case VM_INHERIT_NONE:
|
|
/*
|
|
* drop the mapping
|
|
*/
|
|
break;
|
|
|
|
case VM_INHERIT_SHARE:
|
|
/*
|
|
* share the mapping: this means we want the old and
|
|
* new entries to share amaps and backing objects.
|
|
*/
|
|
|
|
/*
|
|
* if the old_entry needs a new amap (due to prev fork)
|
|
* then we need to allocate it now so that we have
|
|
* something we own to share with the new_entry. [in
|
|
* other words, we need to clear needs_copy]
|
|
*/
|
|
|
|
if (UVM_ET_ISNEEDSCOPY(old_entry)) {
|
|
/* get our own amap, clears needs_copy */
|
|
amap_copy(old_map, old_entry, M_WAITOK, FALSE,
|
|
0, 0);
|
|
/* XXXCDC: WAITOK??? */
|
|
}
|
|
|
|
new_entry = uvm_mapent_alloc(new_map);
|
|
/* old_entry -> new_entry */
|
|
uvm_mapent_copy(old_entry, new_entry);
|
|
|
|
/* new pmap has nothing wired in it */
|
|
new_entry->wired_count = 0;
|
|
|
|
/*
|
|
* gain reference to objects backing the map
|
|
*/
|
|
if (UVM_ET_ISMAP(new_entry)) { /* share map? */
|
|
uvm_map_reference(old_entry->object.share_map);
|
|
} else {
|
|
if (new_entry->aref.ar_amap)
|
|
/* share reference */
|
|
amap_ref(new_entry, AMAP_SHARED);
|
|
|
|
if (new_entry->object.uvm_obj &&
|
|
new_entry->object.uvm_obj->pgops->pgo_reference)
|
|
new_entry->object.uvm_obj->
|
|
pgops->pgo_reference(
|
|
new_entry->object.uvm_obj);
|
|
}
|
|
|
|
/* insert entry at end of new_map's entry list */
|
|
uvm_map_entry_link(new_map, new_map->header.prev,
|
|
new_entry);
|
|
|
|
/*
|
|
* pmap_copy the mappings: this routine is optional
|
|
* but if it is there it will reduce the number of
|
|
* page faults in the new proc.
|
|
*/
|
|
|
|
pmap_copy(new_pmap, old_map->pmap, new_entry->start,
|
|
(old_entry->end - old_entry->start),
|
|
old_entry->start);
|
|
|
|
break;
|
|
|
|
case VM_INHERIT_COPY:
|
|
|
|
/*
|
|
* copy-on-write the mapping (using mmap's
|
|
* MAP_PRIVATE semantics)
|
|
*/
|
|
|
|
/*
|
|
* share maps: we special case it (handled by
|
|
* uvm_map_sharemapcopy)
|
|
*/
|
|
|
|
if (UVM_ET_ISMAP(old_entry)) { /* share map? */
|
|
uvm_map_sharemapcopy(old_map, old_entry,
|
|
new_map);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* not a share map. allocate new_entry, adjust
|
|
* reference counts. (note that new references
|
|
* are read-only).
|
|
*/
|
|
|
|
new_entry = uvm_mapent_alloc(new_map);
|
|
/* old_entry -> new_entry */
|
|
uvm_mapent_copy(old_entry, new_entry);
|
|
|
|
if (new_entry->aref.ar_amap)
|
|
amap_ref(new_entry, 0);
|
|
|
|
if (new_entry->object.uvm_obj &&
|
|
new_entry->object.uvm_obj->pgops->pgo_reference)
|
|
new_entry->object.uvm_obj->pgops->pgo_reference
|
|
(new_entry->object.uvm_obj);
|
|
|
|
/* new pmap has nothing wired in it */
|
|
new_entry->wired_count = 0;
|
|
|
|
new_entry->etype |=
|
|
(UVM_ET_COPYONWRITE|UVM_ET_NEEDSCOPY);
|
|
uvm_map_entry_link(new_map, new_map->header.prev,
|
|
new_entry);
|
|
|
|
/*
|
|
* the new entry will need an amap. it will either
|
|
* need to be copied from the old entry or created
|
|
* from scratch (if the old entry does not have an
|
|
* amap). can we defer this process until later
|
|
* (by setting "needs_copy") or do we need to copy
|
|
* the amap now?
|
|
*
|
|
* we must copy the amap now if any of the following
|
|
* conditions hold:
|
|
* 1. the old entry has an amap and that amap is
|
|
* being shared. this means that the old (parent)
|
|
* process is sharing the amap with another
|
|
* process. if we do not clear needs_copy here
|
|
* we will end up in a situation where both the
|
|
* parent and child process are refering to the
|
|
* same amap with "needs_copy" set. if the
|
|
* parent write-faults, the fault routine will
|
|
* clear "needs_copy" in the parent by allocating
|
|
* a new amap. this is wrong because the
|
|
* parent is supposed to be sharing the old amap
|
|
* and the new amap will break that.
|
|
*
|
|
* 2. if the old entry has an amap and a non-zero
|
|
* wire count then we are going to have to call
|
|
* amap_cow_now to avoid page faults in the
|
|
* parent process. since amap_cow_now requires
|
|
* "needs_copy" to be clear we might as well
|
|
* clear it here as well.
|
|
*
|
|
*/
|
|
|
|
if (old_entry->aref.ar_amap != NULL) {
|
|
|
|
if ((old_entry->aref.ar_amap->am_flags &
|
|
AMAP_SHARED) != 0 ||
|
|
old_entry->wired_count != 0) {
|
|
|
|
amap_copy(new_map, new_entry, M_WAITOK, FALSE,
|
|
0, 0);
|
|
/* XXXCDC: M_WAITOK ... ok? */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* if the parent's entry is wired down, then the
|
|
* parent process does not want page faults on
|
|
* access to that memory. this means that we
|
|
* cannot do copy-on-write because we can't write
|
|
* protect the old entry. in this case we
|
|
* resolve all copy-on-write faults now, using
|
|
* amap_cow_now. note that we have already
|
|
* allocated any needed amap (above).
|
|
*/
|
|
|
|
if (old_entry->wired_count != 0) {
|
|
|
|
/*
|
|
* resolve all copy-on-write faults now
|
|
* (note that there is nothing to do if
|
|
* the old mapping does not have an amap).
|
|
* XXX: is it worthwhile to bother with pmap_copy
|
|
* in this case?
|
|
*/
|
|
if (old_entry->aref.ar_amap)
|
|
amap_cow_now(new_map, new_entry);
|
|
|
|
} else {
|
|
|
|
/*
|
|
* setup mappings to trigger copy-on-write faults
|
|
* we must write-protect the parent if it has
|
|
* an amap and it is not already "needs_copy"...
|
|
* if it is already "needs_copy" then the parent
|
|
* has already been write-protected by a previous
|
|
* fork operation.
|
|
*
|
|
* if we do not write-protect the parent, then
|
|
* we must be sure to write-protect the child
|
|
* after the pmap_copy() operation.
|
|
*
|
|
* XXX: pmap_copy should have some way of telling
|
|
* us that it didn't do anything so we can avoid
|
|
* calling pmap_protect needlessly.
|
|
*/
|
|
|
|
if (old_entry->aref.ar_amap) {
|
|
|
|
if (!UVM_ET_ISNEEDSCOPY(old_entry)) {
|
|
if (old_entry->max_protection & VM_PROT_WRITE) {
|
|
pmap_protect(old_map->pmap,
|
|
old_entry->start,
|
|
old_entry->end,
|
|
old_entry->protection &
|
|
~VM_PROT_WRITE);
|
|
}
|
|
old_entry->etype |= UVM_ET_NEEDSCOPY;
|
|
}
|
|
|
|
/*
|
|
* parent must now be write-protected
|
|
*/
|
|
protect_child = FALSE;
|
|
} else {
|
|
|
|
/*
|
|
* we only need to protect the child if the
|
|
* parent has write access.
|
|
*/
|
|
if (old_entry->max_protection & VM_PROT_WRITE)
|
|
protect_child = TRUE;
|
|
else
|
|
protect_child = FALSE;
|
|
|
|
}
|
|
|
|
/*
|
|
* copy the mappings
|
|
* XXX: need a way to tell if this does anything
|
|
*/
|
|
|
|
pmap_copy(new_pmap, old_map->pmap,
|
|
new_entry->start,
|
|
(old_entry->end - old_entry->start),
|
|
old_entry->start);
|
|
|
|
/*
|
|
* protect the child's mappings if necessary
|
|
*/
|
|
if (protect_child) {
|
|
pmap_protect(new_pmap, new_entry->start,
|
|
new_entry->end,
|
|
new_entry->protection &
|
|
~VM_PROT_WRITE);
|
|
}
|
|
|
|
}
|
|
break;
|
|
} /* end of switch statement */
|
|
old_entry = old_entry->next;
|
|
}
|
|
|
|
new_map->size = old_map->size;
|
|
vm_map_unlock(old_map);
|
|
|
|
#if (defined(i386) || defined(pc532)) && !defined(PMAP_NEW)
|
|
/*
|
|
* allocate zero fill area in the new vmspace's map for user
|
|
* page tables for ports that have old style pmaps that keep
|
|
* user page tables in the top part of the process' address
|
|
* space.
|
|
*
|
|
* XXXCDC: this should go away once all pmaps are fixed
|
|
*/
|
|
{
|
|
vaddr_t addr = VM_MAXUSER_ADDRESS;
|
|
if (uvm_map(new_map, &addr, VM_MAX_ADDRESS - addr, NULL,
|
|
UVM_UNKNOWN_OFFSET, UVM_MAPFLAG(UVM_PROT_ALL,
|
|
UVM_PROT_ALL, UVM_INH_NONE, UVM_ADV_NORMAL,
|
|
UVM_FLAG_FIXED|UVM_FLAG_COPYONW)) != KERN_SUCCESS)
|
|
panic("vm_allocate of PT page area failed");
|
|
}
|
|
#endif
|
|
|
|
#ifdef SYSVSHM
|
|
if (vm1->vm_shm)
|
|
shmfork(vm1, vm2);
|
|
#endif
|
|
|
|
UVMHIST_LOG(maphist,"<- done",0,0,0,0);
|
|
return(vm2);
|
|
}
|
|
|
|
|
|
/*
|
|
* uvm_map_sharemapcopy: handle the copying of a share map during a
|
|
* fork. this is a helper function for uvmspace_fork. it is called
|
|
* when we are doing a fork and we have encountered a map entry which
|
|
* has two attributes: [1] its inherit code is VM_INHERIT_COPY, and
|
|
* [2] it points to a share map (i.e. is_a_map is true). in this case
|
|
* we must traverse the area of the share map pointed to by the
|
|
* old_entry and make private copies of the map entries in the share
|
|
* map. this is somewhat similar to what happens in the non-share map
|
|
* case in fork, but it has to handle multiple map entries which may
|
|
* not be the proper size. it was seperated out into its own function
|
|
* in order to make the main body of the fork code easier to read and
|
|
* understand!
|
|
*
|
|
* main_entry->offset = starting VA in share map for our mapping
|
|
*
|
|
* => main map is locked by caller.
|
|
* => we lock share map.
|
|
* => new map isn't in use yet (still being set up for the first time).
|
|
*/
|
|
|
|
void
|
|
uvm_map_sharemapcopy(main_map, main_entry, new_map)
|
|
vm_map_t main_map, new_map;
|
|
vm_map_entry_t main_entry;
|
|
{
|
|
vm_map_t share_map = main_entry->object.share_map;
|
|
vm_map_entry_t share_entry, new_entry;
|
|
vaddr_t shend = main_entry->offset +
|
|
(main_entry->end - main_entry->start);
|
|
int refs;
|
|
|
|
/*
|
|
* lock share map. find first map entry of interest. clip if needed.
|
|
*/
|
|
|
|
vm_map_lock(share_map);
|
|
if (uvm_map_lookup_entry(share_map, main_entry->offset, &share_entry))
|
|
UVM_MAP_CLIP_START(share_map, share_entry, main_entry->offset);
|
|
|
|
while (share_entry != &share_map->header &&
|
|
share_entry->start < shend) {
|
|
|
|
/*
|
|
* at this point we have a map entry that we need to make a
|
|
* copy of.
|
|
*/
|
|
|
|
/* may need to clip? */
|
|
UVM_MAP_CLIP_END(share_map, share_entry, shend);
|
|
new_entry = uvm_mapent_alloc(new_map);
|
|
|
|
/* share_entry -> new_entry */
|
|
uvm_mapent_copy(share_entry, new_entry);
|
|
|
|
/* convert share map addresses back to main map addresses */
|
|
new_entry->start = main_entry->start +
|
|
(new_entry->start - main_entry->offset);
|
|
new_entry->end = main_entry->start +
|
|
(new_entry->end - main_entry->offset);
|
|
|
|
/* gain references */
|
|
if (new_entry->aref.ar_amap) {
|
|
amap_ref(new_entry, 0);
|
|
}
|
|
if (new_entry->object.uvm_obj &&
|
|
new_entry->object.uvm_obj->pgops->pgo_reference)
|
|
new_entry->object.uvm_obj->
|
|
pgops->pgo_reference(new_entry->object.uvm_obj);
|
|
|
|
/* init rest of new entry and insert at end of new map */
|
|
new_entry->wired_count = 0;
|
|
new_entry->etype |= (UVM_ET_COPYONWRITE|UVM_ET_NEEDSCOPY);
|
|
uvm_map_entry_link(new_map, new_map->header.prev, new_entry);
|
|
|
|
/*
|
|
* don't bother trying to defer the copy in the share map case
|
|
*/
|
|
/* XXXCDC: WAITOK? */
|
|
amap_copy(new_map, new_entry, M_WAITOK, FALSE, 0, 0);
|
|
|
|
/* just like non-share case: can't COW wired memory */
|
|
if (share_entry->wired_count != 0 &&
|
|
UVM_ET_ISCOPYONWRITE(share_entry)) {
|
|
amap_cow_now(new_map, new_entry);
|
|
} else {
|
|
|
|
/* just like non-share case */
|
|
if (UVM_ET_ISCOPYONWRITE(share_entry)) {
|
|
|
|
if (!UVM_ET_ISNEEDSCOPY(share_entry)) {
|
|
|
|
/*
|
|
* must write protect pages. if we
|
|
* have the sole reference to the share
|
|
* map we can use good old pmap_protect.
|
|
* if we don't, then we have to use
|
|
* pmap_page_protect. note that the VA
|
|
* new_entry->start (starting entry of
|
|
* this segment of the share map in
|
|
* child process) is the same virtual
|
|
* address it is mapped in in the parent
|
|
* (thus we can mix main_map and
|
|
* new_entry in the pmap_protect call
|
|
* below).
|
|
*/
|
|
|
|
simple_lock(&share_map->ref_lock);
|
|
refs = share_map->ref_count;
|
|
simple_unlock(&share_map->ref_lock);
|
|
if (refs == 1) {
|
|
pmap_protect(main_map->pmap,
|
|
new_entry->start,
|
|
new_entry->end,
|
|
share_entry->protection &
|
|
~VM_PROT_WRITE);
|
|
} else {
|
|
if (share_entry->aref.ar_amap) {
|
|
simple_lock(
|
|
&share_entry->aref.ar_amap->am_l);
|
|
amap_share_protect(share_entry,
|
|
share_entry->protection &
|
|
~VM_PROT_WRITE);
|
|
simple_unlock(
|
|
&share_entry->aref.ar_amap->am_l);
|
|
}
|
|
if (share_entry->object.uvm_obj)
|
|
{
|
|
#ifdef DIAGNOSTIC
|
|
if (!share_entry->object.uvm_obj->pgops->
|
|
pgo_shareprot)
|
|
panic("fork: share_entry with no prot function");
|
|
#endif
|
|
simple_lock(
|
|
&share_entry->object.uvm_obj->vmobjlock);
|
|
share_entry->object.uvm_obj->pgops->
|
|
pgo_shareprot(share_entry,
|
|
share_entry->protection & ~VM_PROT_WRITE);
|
|
simple_unlock(
|
|
&share_entry->object.uvm_obj->vmobjlock);
|
|
}
|
|
}
|
|
share_entry->etype |= UVM_ET_NEEDSCOPY;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* now copy the mappings: note address are the same
|
|
* in both main_map and new_map
|
|
*/
|
|
pmap_copy(new_map->pmap, main_map->pmap,
|
|
new_entry->start,
|
|
(new_entry->end - new_entry->start),
|
|
new_entry->start);
|
|
|
|
/* just like non-share case */
|
|
if (!UVM_ET_ISCOPYONWRITE(share_entry)) {
|
|
pmap_protect(new_map->pmap, new_entry->start,
|
|
new_entry->end,
|
|
new_entry->protection & ~VM_PROT_WRITE);
|
|
}
|
|
}
|
|
|
|
/* next entry in share map, please */
|
|
share_entry = share_entry->next;
|
|
|
|
}
|
|
/* done! */
|
|
}
|
|
|
|
#if defined(DDB)
|
|
|
|
/*
|
|
* DDB hooks
|
|
*/
|
|
|
|
/*
|
|
* uvm_map_print: print out a map
|
|
*/
|
|
|
|
void
|
|
uvm_map_print(map, full)
|
|
vm_map_t map;
|
|
boolean_t full;
|
|
{
|
|
|
|
uvm_map_printit(map, full, printf);
|
|
}
|
|
|
|
/*
|
|
* uvm_map_printit: actually prints the map
|
|
*/
|
|
|
|
void
|
|
uvm_map_printit(map, full, pr)
|
|
vm_map_t map;
|
|
boolean_t full;
|
|
void (*pr) __P((const char *, ...));
|
|
{
|
|
vm_map_entry_t entry;
|
|
|
|
(*pr)("MAP %p: [0x%lx->0x%lx]\n", map, map->min_offset,map->max_offset);
|
|
(*pr)("\t#ent=%d, sz=%d, ref=%d, main=%c, version=%d\n",
|
|
map->nentries, map->size, map->ref_count,
|
|
(map->is_main_map) ? 'T' : 'F', map->timestamp);
|
|
#ifdef pmap_resident_count
|
|
(*pr)("\tpmap=%p(resident=%d)\n", map->pmap,
|
|
pmap_resident_count(map->pmap));
|
|
#else
|
|
/* XXXCDC: this should be required ... */
|
|
(*pr)("\tpmap=%p(resident=<<NOT SUPPORTED!!!>>)\n", map->pmap);
|
|
#endif
|
|
if (!full)
|
|
return;
|
|
for (entry = map->header.next; entry != &map->header;
|
|
entry = entry->next) {
|
|
(*pr)(" - %p: 0x%lx->0x%lx: obj=%p/0x%x, amap=%p/%d\n",
|
|
entry, entry->start, entry->end, entry->object.uvm_obj,
|
|
entry->offset, entry->aref.ar_amap, entry->aref.ar_slotoff);
|
|
(*pr)(
|
|
"\tmap=%c, submap=%c, cow=%c, nc=%c, prot(max)=%d/%d, inh=%d, wc=%d, adv=%d\n",
|
|
(entry->etype & UVM_ET_MAP) ? 'T' : 'F',
|
|
(entry->etype & UVM_ET_SUBMAP) ? 'T' : 'F',
|
|
(entry->etype & UVM_ET_COPYONWRITE) ? 'T' : 'F',
|
|
(entry->etype & UVM_ET_NEEDSCOPY) ? 'T' : 'F',
|
|
entry->protection, entry->max_protection,
|
|
entry->inheritance, entry->wired_count, entry->advice);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* uvm_object_print: print out an object
|
|
*/
|
|
|
|
void
|
|
uvm_object_print(uobj, full)
|
|
struct uvm_object *uobj;
|
|
boolean_t full;
|
|
{
|
|
|
|
uvm_object_printit(uobj, full, printf);
|
|
}
|
|
|
|
/*
|
|
* uvm_object_printit: actually prints the object
|
|
*/
|
|
|
|
void
|
|
uvm_object_printit(uobj, full, pr)
|
|
struct uvm_object *uobj;
|
|
boolean_t full;
|
|
void (*pr) __P((const char *, ...));
|
|
{
|
|
struct vm_page *pg;
|
|
int cnt = 0;
|
|
|
|
(*pr)("OBJECT %p: pgops=%p, npages=%d, ", uobj, uobj->pgops,
|
|
uobj->uo_npages);
|
|
if (uobj->uo_refs == UVM_OBJ_KERN)
|
|
(*pr)("refs=<SYSTEM>\n");
|
|
else
|
|
(*pr)("refs=%d\n", uobj->uo_refs);
|
|
|
|
if (!full) return;
|
|
(*pr)(" PAGES <pg,offset>:\n ");
|
|
for (pg = uobj->memq.tqh_first ; pg ; pg = pg->listq.tqe_next, cnt++) {
|
|
(*pr)("<%p,0x%lx> ", pg, pg->offset);
|
|
if ((cnt % 3) == 2) (*pr)("\n ");
|
|
}
|
|
if ((cnt % 3) != 2) (*pr)("\n");
|
|
}
|
|
|
|
/*
|
|
* uvm_page_print: print out a page
|
|
*/
|
|
|
|
void
|
|
uvm_page_print(pg, full)
|
|
struct vm_page *pg;
|
|
boolean_t full;
|
|
{
|
|
|
|
uvm_page_printit(pg, full, printf);
|
|
}
|
|
|
|
/*
|
|
* uvm_page_printit: actually print the page
|
|
*/
|
|
|
|
void
|
|
uvm_page_printit(pg, full, pr)
|
|
struct vm_page *pg;
|
|
boolean_t full;
|
|
void (*pr) __P((const char *, ...));
|
|
{
|
|
struct vm_page *lcv;
|
|
struct uvm_object *uobj;
|
|
struct pglist *pgl;
|
|
|
|
(*pr)("PAGE %p:\n", pg);
|
|
(*pr)(" flags=0x%x, pqflags=0x%x, vers=%d, wire_count=%d, pa=0x%lx\n",
|
|
pg->flags, pg->pqflags, pg->version, pg->wire_count, (long)pg->phys_addr);
|
|
(*pr)(" uobject=%p, uanon=%p, offset=0x%lx loan_count=%d\n",
|
|
pg->uobject, pg->uanon, pg->offset, pg->loan_count);
|
|
#if defined(UVM_PAGE_TRKOWN)
|
|
if (pg->flags & PG_BUSY)
|
|
(*pr)(" owning process = %d, tag=%s\n",
|
|
pg->owner, pg->owner_tag);
|
|
else
|
|
(*pr)(" page not busy, no owner\n");
|
|
#else
|
|
(*pr)(" [page ownership tracking disabled]\n");
|
|
#endif
|
|
|
|
if (!full)
|
|
return;
|
|
|
|
/* cross-verify object/anon */
|
|
if ((pg->pqflags & PQ_FREE) == 0) {
|
|
if (pg->pqflags & PQ_ANON) {
|
|
if (pg->uanon == NULL || pg->uanon->u.an_page != pg)
|
|
(*pr)(" >>> ANON DOES NOT POINT HERE <<< (%p)\n",
|
|
(pg->uanon) ? pg->uanon->u.an_page : NULL);
|
|
else
|
|
(*pr)(" anon backpointer is OK\n");
|
|
} else {
|
|
uobj = pg->uobject;
|
|
if (uobj) {
|
|
(*pr)(" checking object list\n");
|
|
for (lcv = uobj->memq.tqh_first ; lcv ;
|
|
lcv = lcv->listq.tqe_next) {
|
|
if (lcv == pg) break;
|
|
}
|
|
if (lcv)
|
|
(*pr)(" page found on object list\n");
|
|
else
|
|
(*pr)(" >>> PAGE NOT FOUND ON OBJECT LIST! <<<\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
/* cross-verify page queue */
|
|
if (pg->pqflags & PQ_FREE)
|
|
pgl = &uvm.page_free[uvm_page_lookup_freelist(pg)];
|
|
else if (pg->pqflags & PQ_INACTIVE)
|
|
pgl = (pg->pqflags & PQ_SWAPBACKED) ?
|
|
&uvm.page_inactive_swp : &uvm.page_inactive_obj;
|
|
else if (pg->pqflags & PQ_ACTIVE)
|
|
pgl = &uvm.page_active;
|
|
else
|
|
pgl = NULL;
|
|
|
|
if (pgl) {
|
|
(*pr)(" checking pageq list\n");
|
|
for (lcv = pgl->tqh_first ; lcv ; lcv = lcv->pageq.tqe_next) {
|
|
if (lcv == pg) break;
|
|
}
|
|
if (lcv)
|
|
(*pr)(" page found on pageq list\n");
|
|
else
|
|
(*pr)(" >>> PAGE NOT FOUND ON PAGEQ LIST! <<<\n");
|
|
}
|
|
}
|
|
#endif
|