bcca5847d5
other "system" header files. Also help the deprecation of lockmgr.h by making it a sub-include of sys/lock.h and removing sys/lockmgr.h form kernel .c files. Sort sys/*.h includes where possible in affected files. OK'ed by: bde (with reservations)
495 lines
14 KiB
C
495 lines
14 KiB
C
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_kern.c 8.3 (Berkeley) 1/12/94
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $FreeBSD$
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*/
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/*
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* Kernel memory management.
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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/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pageout.h>
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#include <vm/vm_extern.h>
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vm_map_t kernel_map=0;
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vm_map_t kmem_map=0;
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vm_map_t exec_map=0;
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vm_map_t clean_map=0;
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vm_map_t buffer_map=0;
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vm_map_t mb_map=0;
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int mb_map_full=0;
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/*
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* kmem_alloc_pageable:
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*
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* Allocate pageable memory to the kernel's address map.
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* "map" must be kernel_map or a submap of kernel_map.
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*/
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vm_offset_t
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kmem_alloc_pageable(map, size)
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vm_map_t map;
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vm_size_t size;
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{
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vm_offset_t addr;
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int result;
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size = round_page(size);
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addr = vm_map_min(map);
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result = vm_map_find(map, NULL, (vm_offset_t) 0,
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&addr, size, TRUE, VM_PROT_ALL, VM_PROT_ALL, 0);
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if (result != KERN_SUCCESS) {
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return (0);
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}
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return (addr);
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}
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/*
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* kmem_alloc_nofault:
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*
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* Same as kmem_alloc_pageable, except that it create a nofault entry.
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*/
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vm_offset_t
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kmem_alloc_nofault(map, size)
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vm_map_t map;
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vm_size_t size;
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{
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vm_offset_t addr;
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int result;
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size = round_page(size);
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addr = vm_map_min(map);
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result = vm_map_find(map, NULL, (vm_offset_t) 0,
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&addr, size, TRUE, VM_PROT_ALL, VM_PROT_ALL, MAP_NOFAULT);
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if (result != KERN_SUCCESS) {
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return (0);
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}
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return (addr);
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}
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/*
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* Allocate wired-down memory in the kernel's address map
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* or a submap.
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*/
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vm_offset_t
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kmem_alloc(map, size)
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vm_map_t map;
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vm_size_t size;
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{
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vm_offset_t addr;
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vm_offset_t offset;
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vm_offset_t i;
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mtx_assert(&Giant, MA_OWNED);
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size = round_page(size);
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/*
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* Use the kernel object for wired-down kernel pages. Assume that no
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* region of the kernel object is referenced more than once.
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*/
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/*
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* Locate sufficient space in the map. This will give us the final
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* virtual address for the new memory, and thus will tell us the
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* offset within the kernel map.
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*/
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vm_map_lock(map);
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if (vm_map_findspace(map, vm_map_min(map), size, &addr)) {
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vm_map_unlock(map);
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return (0);
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}
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offset = addr - VM_MIN_KERNEL_ADDRESS;
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vm_object_reference(kernel_object);
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vm_map_insert(map, kernel_object, offset, addr, addr + size,
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VM_PROT_ALL, VM_PROT_ALL, 0);
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vm_map_unlock(map);
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/*
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* Guarantee that there are pages already in this object before
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* calling vm_map_pageable. This is to prevent the following
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* scenario:
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*
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* 1) Threads have swapped out, so that there is a pager for the
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* kernel_object. 2) The kmsg zone is empty, and so we are
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* kmem_allocing a new page for it. 3) vm_map_pageable calls vm_fault;
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* there is no page, but there is a pager, so we call
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* pager_data_request. But the kmsg zone is empty, so we must
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* kmem_alloc. 4) goto 1 5) Even if the kmsg zone is not empty: when
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* we get the data back from the pager, it will be (very stale)
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* non-zero data. kmem_alloc is defined to return zero-filled memory.
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*
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* We're intentionally not activating the pages we allocate to prevent a
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* race with page-out. vm_map_pageable will wire the pages.
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*/
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for (i = 0; i < size; i += PAGE_SIZE) {
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vm_page_t mem;
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mem = vm_page_grab(kernel_object, OFF_TO_IDX(offset + i),
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VM_ALLOC_ZERO | VM_ALLOC_RETRY);
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if ((mem->flags & PG_ZERO) == 0)
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vm_page_zero_fill(mem);
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mem->valid = VM_PAGE_BITS_ALL;
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vm_page_flag_clear(mem, PG_ZERO);
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vm_page_wakeup(mem);
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}
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/*
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* And finally, mark the data as non-pageable.
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*/
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(void) vm_map_pageable(map, (vm_offset_t) addr, addr + size, FALSE);
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return (addr);
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}
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/*
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* kmem_free:
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*
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* Release a region of kernel virtual memory allocated
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* with kmem_alloc, and return the physical pages
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* associated with that region.
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*
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* This routine may not block on kernel maps.
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*/
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void
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kmem_free(map, addr, size)
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vm_map_t map;
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vm_offset_t addr;
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vm_size_t size;
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{
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mtx_assert(&Giant, MA_OWNED);
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(void) vm_map_remove(map, trunc_page(addr), round_page(addr + size));
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}
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/*
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* kmem_suballoc:
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*
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* Allocates a map to manage a subrange
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* of the kernel virtual address space.
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*
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* Arguments are as follows:
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*
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* parent Map to take range from
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* min, max Returned endpoints of map
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* size Size of range to find
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*/
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vm_map_t
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kmem_suballoc(parent, min, max, size)
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vm_map_t parent;
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vm_offset_t *min, *max;
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vm_size_t size;
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{
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int ret;
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vm_map_t result;
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size = round_page(size);
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*min = (vm_offset_t) vm_map_min(parent);
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ret = vm_map_find(parent, NULL, (vm_offset_t) 0,
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min, size, TRUE, VM_PROT_ALL, VM_PROT_ALL, 0);
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if (ret != KERN_SUCCESS) {
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printf("kmem_suballoc: bad status return of %d.\n", ret);
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panic("kmem_suballoc");
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}
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*max = *min + size;
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pmap_reference(vm_map_pmap(parent));
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result = vm_map_create(vm_map_pmap(parent), *min, *max);
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if (result == NULL)
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panic("kmem_suballoc: cannot create submap");
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if (vm_map_submap(parent, *min, *max, result) != KERN_SUCCESS)
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panic("kmem_suballoc: unable to change range to submap");
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return (result);
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}
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/*
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* kmem_malloc:
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*
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* Allocate wired-down memory in the kernel's address map for the higher
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* level kernel memory allocator (kern/kern_malloc.c). We cannot use
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* kmem_alloc() because we may need to allocate memory at interrupt
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* level where we cannot block (canwait == FALSE).
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*
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* This routine has its own private kernel submap (kmem_map) and object
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* (kmem_object). This, combined with the fact that only malloc uses
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* this routine, ensures that we will never block in map or object waits.
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*
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* Note that this still only works in a uni-processor environment and
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* when called at splhigh().
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*
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* We don't worry about expanding the map (adding entries) since entries
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* for wired maps are statically allocated.
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*
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* NOTE: This routine is not supposed to block if M_NOWAIT is set, but
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* I have not verified that it actually does not block.
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*/
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vm_offset_t
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kmem_malloc(map, size, flags)
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vm_map_t map;
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vm_size_t size;
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int flags;
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{
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vm_offset_t offset, i;
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vm_map_entry_t entry;
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vm_offset_t addr;
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vm_page_t m;
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if (map != kmem_map && map != mb_map)
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panic("kmem_malloc: map != {kmem,mb}_map");
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size = round_page(size);
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addr = vm_map_min(map);
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/*
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* Locate sufficient space in the map. This will give us the final
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* virtual address for the new memory, and thus will tell us the
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* offset within the kernel map.
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*/
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vm_map_lock(map);
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if (vm_map_findspace(map, vm_map_min(map), size, &addr)) {
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vm_map_unlock(map);
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if (map == mb_map) {
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mb_map_full = TRUE;
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printf("Out of mbuf clusters - adjust NMBCLUSTERS or increase maxusers!\n");
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return (0);
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}
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if ((flags & M_NOWAIT) == 0)
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panic("kmem_malloc(%ld): kmem_map too small: %ld total allocated",
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(long)size, (long)map->size);
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return (0);
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}
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offset = addr - VM_MIN_KERNEL_ADDRESS;
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vm_object_reference(kmem_object);
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vm_map_insert(map, kmem_object, offset, addr, addr + size,
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VM_PROT_ALL, VM_PROT_ALL, 0);
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for (i = 0; i < size; i += PAGE_SIZE) {
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/*
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* Note: if M_NOWAIT specified alone, allocate from
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* interrupt-safe queues only (just the free list). If
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* M_ASLEEP or M_USE_RESERVE is also specified, we can also
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* allocate from the cache. Neither of the latter two
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* flags may be specified from an interrupt since interrupts
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* are not allowed to mess with the cache queue.
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*/
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retry:
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m = vm_page_alloc(kmem_object, OFF_TO_IDX(offset + i),
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((flags & (M_NOWAIT|M_ASLEEP|M_USE_RESERVE)) == M_NOWAIT) ?
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VM_ALLOC_INTERRUPT :
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VM_ALLOC_SYSTEM);
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/*
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* Ran out of space, free everything up and return. Don't need
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* to lock page queues here as we know that the pages we got
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* aren't on any queues.
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*/
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if (m == NULL) {
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if ((flags & M_NOWAIT) == 0) {
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vm_map_unlock(map);
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VM_WAIT;
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vm_map_lock(map);
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goto retry;
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}
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vm_map_delete(map, addr, addr + size);
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vm_map_unlock(map);
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if (flags & M_ASLEEP) {
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VM_AWAIT;
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}
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return (0);
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}
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vm_page_flag_clear(m, PG_ZERO);
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m->valid = VM_PAGE_BITS_ALL;
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}
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/*
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* Mark map entry as non-pageable. Assert: vm_map_insert() will never
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* be able to extend the previous entry so there will be a new entry
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* exactly corresponding to this address range and it will have
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* wired_count == 0.
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*/
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if (!vm_map_lookup_entry(map, addr, &entry) ||
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entry->start != addr || entry->end != addr + size ||
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entry->wired_count != 0)
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panic("kmem_malloc: entry not found or misaligned");
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entry->wired_count = 1;
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vm_map_simplify_entry(map, entry);
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/*
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* Loop thru pages, entering them in the pmap. (We cannot add them to
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* the wired count without wrapping the vm_page_queue_lock in
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* splimp...)
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*/
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for (i = 0; i < size; i += PAGE_SIZE) {
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m = vm_page_lookup(kmem_object, OFF_TO_IDX(offset + i));
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vm_page_wire(m);
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vm_page_wakeup(m);
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/*
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* Because this is kernel_pmap, this call will not block.
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*/
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pmap_enter(kernel_pmap, addr + i, m, VM_PROT_ALL, 1);
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vm_page_flag_set(m, PG_MAPPED | PG_WRITEABLE | PG_REFERENCED);
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}
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vm_map_unlock(map);
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return (addr);
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}
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/*
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* kmem_alloc_wait:
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*
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* Allocates pageable memory from a sub-map of the kernel. If the submap
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* has no room, the caller sleeps waiting for more memory in the submap.
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*
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* This routine may block.
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*/
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vm_offset_t
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kmem_alloc_wait(map, size)
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vm_map_t map;
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vm_size_t size;
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{
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vm_offset_t addr;
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size = round_page(size);
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for (;;) {
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/*
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* To make this work for more than one map, use the map's lock
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* to lock out sleepers/wakers.
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*/
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vm_map_lock(map);
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if (vm_map_findspace(map, vm_map_min(map), size, &addr) == 0)
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break;
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/* no space now; see if we can ever get space */
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if (vm_map_max(map) - vm_map_min(map) < size) {
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vm_map_unlock(map);
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return (0);
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}
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vm_map_unlock(map);
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tsleep(map, PVM, "kmaw", 0);
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}
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vm_map_insert(map, NULL, (vm_offset_t) 0, addr, addr + size, VM_PROT_ALL, VM_PROT_ALL, 0);
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vm_map_unlock(map);
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return (addr);
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}
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/*
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* kmem_free_wakeup:
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*
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* Returns memory to a submap of the kernel, and wakes up any processes
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* waiting for memory in that map.
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*/
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void
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kmem_free_wakeup(map, addr, size)
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vm_map_t map;
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vm_offset_t addr;
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vm_size_t size;
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{
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vm_map_lock(map);
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(void) vm_map_delete(map, trunc_page(addr), round_page(addr + size));
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wakeup(map);
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vm_map_unlock(map);
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}
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/*
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* kmem_init:
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*
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* Create the kernel map; insert a mapping covering kernel text,
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* data, bss, and all space allocated thus far (`boostrap' data). The
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* new map will thus map the range between VM_MIN_KERNEL_ADDRESS and
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* `start' as allocated, and the range between `start' and `end' as free.
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*/
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void
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kmem_init(start, end)
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vm_offset_t start, end;
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{
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vm_map_t m;
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m = vm_map_create(kernel_pmap, VM_MIN_KERNEL_ADDRESS, end);
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vm_map_lock(m);
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/* N.B.: cannot use kgdb to debug, starting with this assignment ... */
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kernel_map = m;
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kernel_map->system_map = 1;
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(void) vm_map_insert(m, NULL, (vm_offset_t) 0,
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VM_MIN_KERNEL_ADDRESS, start, VM_PROT_ALL, VM_PROT_ALL, 0);
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/* ... and ending with the completion of the above `insert' */
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vm_map_unlock(m);
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}
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