787 lines
21 KiB
C
787 lines
21 KiB
C
/* $NetBSD: uvm_km.c,v 1.56 2002/03/07 20:15:32 thorpej Exp $ */
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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_kern.c 8.3 (Berkeley) 1/12/94
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* from: Id: uvm_km.c,v 1.1.2.14 1998/02/06 05:19:27 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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/*
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* uvm_km.c: handle kernel memory allocation and management
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*/
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/*
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* overview of kernel memory management:
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*
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* the kernel virtual address space is mapped by "kernel_map." kernel_map
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* starts at VM_MIN_KERNEL_ADDRESS and goes to VM_MAX_KERNEL_ADDRESS.
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* note that VM_MIN_KERNEL_ADDRESS is equal to vm_map_min(kernel_map).
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*
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* the kernel_map has several "submaps." submaps can only appear in
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* the kernel_map (user processes can't use them). submaps "take over"
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* the management of a sub-range of the kernel's address space. submaps
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* are typically allocated at boot time and are never released. kernel
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* virtual address space that is mapped by a submap is locked by the
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* submap's lock -- not the kernel_map's lock.
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*
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* thus, the useful feature of submaps is that they allow us to break
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* up the locking and protection of the kernel address space into smaller
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* chunks.
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*
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* the vm system has several standard kernel submaps, including:
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* kmem_map => contains only wired kernel memory for the kernel
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* malloc. *** access to kmem_map must be protected
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* by splvm() because we are allowed to call malloc()
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* at interrupt time ***
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* mb_map => memory for large mbufs, *** protected by splvm ***
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* pager_map => used to map "buf" structures into kernel space
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* exec_map => used during exec to handle exec args
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* etc...
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*
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* the kernel allocates its private memory out of special uvm_objects whose
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* reference count is set to UVM_OBJ_KERN (thus indicating that the objects
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* are "special" and never die). all kernel objects should be thought of
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* as large, fixed-sized, sparsely populated uvm_objects. each kernel
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* object is equal to the size of kernel virtual address space (i.e. the
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* value "VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS").
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*
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* most kernel private memory lives in kernel_object. the only exception
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* to this is for memory that belongs to submaps that must be protected
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* by splvm(). pages in these submaps are not assigned to an object.
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*
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* note that just because a kernel object spans the entire kernel virutal
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* address space doesn't mean that it has to be mapped into the entire space.
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* large chunks of a kernel object's space go unused either because
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* that area of kernel VM is unmapped, or there is some other type of
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* object mapped into that range (e.g. a vnode). for submap's kernel
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* objects, the only part of the object that can ever be populated is the
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* offsets that are managed by the submap.
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*
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* note that the "offset" in a kernel object is always the kernel virtual
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* address minus the VM_MIN_KERNEL_ADDRESS (aka vm_map_min(kernel_map)).
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* example:
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* suppose VM_MIN_KERNEL_ADDRESS is 0xf8000000 and the kernel does a
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* uvm_km_alloc(kernel_map, PAGE_SIZE) [allocate 1 wired down page in the
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* kernel map]. if uvm_km_alloc returns virtual address 0xf8235000,
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* then that means that the page at offset 0x235000 in kernel_object is
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* mapped at 0xf8235000.
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*
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* kernel object have one other special property: when the kernel virtual
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* memory mapping them is unmapped, the backing memory in the object is
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* freed right away. this is done with the uvm_km_pgremove() function.
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* this has to be done because there is no backing store for kernel pages
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* and no need to save them after they are no longer referenced.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: uvm_km.c,v 1.56 2002/03/07 20:15:32 thorpej Exp $");
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#include "opt_uvmhist.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <uvm/uvm.h>
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/*
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* global data structures
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*/
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struct vm_map *kernel_map = NULL;
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/*
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* local data structues
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*/
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static struct vm_map kernel_map_store;
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/*
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* uvm_km_init: init kernel maps and objects to reflect reality (i.e.
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* KVM already allocated for text, data, bss, and static data structures).
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*
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* => KVM is defined by VM_MIN_KERNEL_ADDRESS/VM_MAX_KERNEL_ADDRESS.
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* we assume that [min -> start] has already been allocated and that
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* "end" is the end.
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*/
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void
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uvm_km_init(start, end)
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vaddr_t start, end;
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{
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vaddr_t base = VM_MIN_KERNEL_ADDRESS;
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/*
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* next, init kernel memory objects.
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*/
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/* kernel_object: for pageable anonymous kernel memory */
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uao_init();
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uvm.kernel_object = uao_create(VM_MAX_KERNEL_ADDRESS -
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VM_MIN_KERNEL_ADDRESS, UAO_FLAG_KERNOBJ);
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/*
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* init the map and reserve any space that might already
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* have been allocated kernel space before installing.
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*/
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uvm_map_setup(&kernel_map_store, base, end, VM_MAP_PAGEABLE);
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kernel_map_store.pmap = pmap_kernel();
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if (start != base &&
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uvm_map(&kernel_map_store, &base, start - base, NULL,
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UVM_UNKNOWN_OFFSET, 0,
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UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_NONE,
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UVM_ADV_RANDOM, UVM_FLAG_FIXED)) != 0)
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panic("uvm_km_init: could not reserve space for kernel");
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/*
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* install!
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*/
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kernel_map = &kernel_map_store;
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}
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/*
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* uvm_km_suballoc: allocate a submap in the kernel map. once a submap
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* is allocated all references to that area of VM must go through it. this
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* allows the locking of VAs in kernel_map to be broken up into regions.
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*
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* => if `fixed' is true, *min specifies where the region described
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* by the submap must start
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* => if submap is non NULL we use that as the submap, otherwise we
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* alloc a new map
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*/
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struct vm_map *
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uvm_km_suballoc(map, min, max, size, flags, fixed, submap)
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struct vm_map *map;
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vaddr_t *min, *max; /* IN/OUT, OUT */
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vsize_t size;
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int flags;
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boolean_t fixed;
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struct vm_map *submap;
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{
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int mapflags = UVM_FLAG_NOMERGE | (fixed ? UVM_FLAG_FIXED : 0);
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size = round_page(size); /* round up to pagesize */
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/*
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* first allocate a blank spot in the parent map
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*/
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if (uvm_map(map, min, size, NULL, UVM_UNKNOWN_OFFSET, 0,
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UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_NONE,
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UVM_ADV_RANDOM, mapflags)) != 0) {
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panic("uvm_km_suballoc: unable to allocate space in parent map");
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}
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/*
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* set VM bounds (min is filled in by uvm_map)
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*/
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*max = *min + size;
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/*
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* add references to pmap and create or init the submap
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*/
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pmap_reference(vm_map_pmap(map));
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if (submap == NULL) {
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submap = uvm_map_create(vm_map_pmap(map), *min, *max, flags);
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if (submap == NULL)
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panic("uvm_km_suballoc: unable to create submap");
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} else {
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uvm_map_setup(submap, *min, *max, flags);
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submap->pmap = vm_map_pmap(map);
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}
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/*
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* now let uvm_map_submap plug in it...
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*/
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if (uvm_map_submap(map, *min, *max, submap) != 0)
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panic("uvm_km_suballoc: submap allocation failed");
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return(submap);
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}
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/*
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* uvm_km_pgremove: remove pages from a kernel uvm_object.
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*
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* => when you unmap a part of anonymous kernel memory you want to toss
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* the pages right away. (this gets called from uvm_unmap_...).
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*/
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void
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uvm_km_pgremove(uobj, start, end)
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struct uvm_object *uobj;
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vaddr_t start, end;
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{
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struct vm_page *pg;
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voff_t curoff, nextoff;
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int swpgonlydelta = 0;
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UVMHIST_FUNC("uvm_km_pgremove"); UVMHIST_CALLED(maphist);
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KASSERT(uobj->pgops == &aobj_pager);
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simple_lock(&uobj->vmobjlock);
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for (curoff = start; curoff < end; curoff = nextoff) {
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nextoff = curoff + PAGE_SIZE;
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pg = uvm_pagelookup(uobj, curoff);
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if (pg != NULL && pg->flags & PG_BUSY) {
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pg->flags |= PG_WANTED;
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UVM_UNLOCK_AND_WAIT(pg, &uobj->vmobjlock, 0,
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"km_pgrm", 0);
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simple_lock(&uobj->vmobjlock);
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nextoff = curoff;
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continue;
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}
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/*
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* free the swap slot, then the page.
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*/
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if (pg == NULL &&
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uao_find_swslot(uobj, curoff >> PAGE_SHIFT) != 0) {
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swpgonlydelta++;
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}
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uao_dropswap(uobj, curoff >> PAGE_SHIFT);
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if (pg != NULL) {
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uvm_lock_pageq();
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uvm_pagefree(pg);
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uvm_unlock_pageq();
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}
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}
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simple_unlock(&uobj->vmobjlock);
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if (swpgonlydelta > 0) {
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simple_lock(&uvm.swap_data_lock);
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KASSERT(uvmexp.swpgonly >= swpgonlydelta);
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uvmexp.swpgonly -= swpgonlydelta;
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simple_unlock(&uvm.swap_data_lock);
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}
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}
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/*
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* uvm_km_pgremove_intrsafe: like uvm_km_pgremove(), but for "intrsafe"
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* maps
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*
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* => when you unmap a part of anonymous kernel memory you want to toss
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* the pages right away. (this is called from uvm_unmap_...).
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* => none of the pages will ever be busy, and none of them will ever
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* be on the active or inactive queues (because they have no object).
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*/
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void
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uvm_km_pgremove_intrsafe(start, end)
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vaddr_t start, end;
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{
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struct vm_page *pg;
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paddr_t pa;
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UVMHIST_FUNC("uvm_km_pgremove_intrsafe"); UVMHIST_CALLED(maphist);
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for (; start < end; start += PAGE_SIZE) {
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if (!pmap_extract(pmap_kernel(), start, &pa)) {
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continue;
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}
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pg = PHYS_TO_VM_PAGE(pa);
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KASSERT(pg);
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KASSERT(pg->uobject == NULL && pg->uanon == NULL);
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uvm_pagefree(pg);
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}
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}
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/*
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* uvm_km_kmemalloc: lower level kernel memory allocator for malloc()
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*
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* => we map wired memory into the specified map using the obj passed in
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* => NOTE: we can return NULL even if we can wait if there is not enough
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* free VM space in the map... caller should be prepared to handle
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* this case.
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* => we return KVA of memory allocated
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* => flags: NOWAIT, VALLOC - just allocate VA, TRYLOCK - fail if we can't
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* lock the map
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*/
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vaddr_t
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uvm_km_kmemalloc(map, obj, size, flags)
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struct vm_map *map;
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struct uvm_object *obj;
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vsize_t size;
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int flags;
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{
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vaddr_t kva, loopva;
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vaddr_t offset;
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vsize_t loopsize;
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struct vm_page *pg;
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UVMHIST_FUNC("uvm_km_kmemalloc"); UVMHIST_CALLED(maphist);
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UVMHIST_LOG(maphist," (map=0x%x, obj=0x%x, size=0x%x, flags=%d)",
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map, obj, size, flags);
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KASSERT(vm_map_pmap(map) == pmap_kernel());
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/*
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* setup for call
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*/
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size = round_page(size);
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kva = vm_map_min(map); /* hint */
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/*
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* allocate some virtual space
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*/
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if (__predict_false(uvm_map(map, &kva, size, obj, UVM_UNKNOWN_OFFSET,
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0, UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_NONE,
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UVM_ADV_RANDOM, (flags & UVM_KMF_TRYLOCK)))
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!= 0)) {
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UVMHIST_LOG(maphist, "<- done (no VM)",0,0,0,0);
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return(0);
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}
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/*
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* if all we wanted was VA, return now
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*/
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if (flags & UVM_KMF_VALLOC) {
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UVMHIST_LOG(maphist,"<- done valloc (kva=0x%x)", kva,0,0,0);
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return(kva);
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}
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/*
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* recover object offset from virtual address
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*/
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offset = kva - vm_map_min(kernel_map);
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UVMHIST_LOG(maphist, " kva=0x%x, offset=0x%x", kva, offset,0,0);
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/*
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* now allocate and map in the memory... note that we are the only ones
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* whom should ever get a handle on this area of VM.
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*/
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loopva = kva;
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loopsize = size;
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while (loopsize) {
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if (obj) {
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simple_lock(&obj->vmobjlock);
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}
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pg = uvm_pagealloc(obj, offset, NULL, UVM_PGA_USERESERVE);
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if (__predict_true(pg != NULL)) {
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pg->flags &= ~PG_BUSY; /* new page */
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UVM_PAGE_OWN(pg, NULL);
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}
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if (obj) {
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simple_unlock(&obj->vmobjlock);
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}
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/*
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* out of memory?
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*/
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if (__predict_false(pg == NULL)) {
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if (flags & UVM_KMF_NOWAIT) {
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/* free everything! */
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uvm_unmap(map, kva, kva + size);
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return(0);
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} else {
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uvm_wait("km_getwait2"); /* sleep here */
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continue;
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}
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}
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/*
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* map it in
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*/
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if (obj == NULL) {
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pmap_kenter_pa(loopva, VM_PAGE_TO_PHYS(pg),
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VM_PROT_ALL);
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} else {
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pmap_enter(map->pmap, loopva, VM_PAGE_TO_PHYS(pg),
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UVM_PROT_ALL,
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PMAP_WIRED | VM_PROT_READ | VM_PROT_WRITE);
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}
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loopva += PAGE_SIZE;
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offset += PAGE_SIZE;
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loopsize -= PAGE_SIZE;
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}
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pmap_update(pmap_kernel());
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UVMHIST_LOG(maphist,"<- done (kva=0x%x)", kva,0,0,0);
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return(kva);
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}
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/*
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* uvm_km_free: free an area of kernel memory
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*/
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void
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uvm_km_free(map, addr, size)
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struct vm_map *map;
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vaddr_t addr;
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vsize_t size;
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{
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uvm_unmap(map, trunc_page(addr), round_page(addr+size));
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}
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/*
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* uvm_km_free_wakeup: free an area of kernel memory and wake up
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* anyone waiting for vm space.
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*
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* => XXX: "wanted" bit + unlock&wait on other end?
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*/
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void
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uvm_km_free_wakeup(map, addr, size)
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struct vm_map *map;
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vaddr_t addr;
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vsize_t size;
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{
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struct vm_map_entry *dead_entries;
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vm_map_lock(map);
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uvm_unmap_remove(map, trunc_page(addr), round_page(addr + size),
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&dead_entries);
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wakeup(map);
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vm_map_unlock(map);
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if (dead_entries != NULL)
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uvm_unmap_detach(dead_entries, 0);
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}
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/*
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* uvm_km_alloc1: allocate wired down memory in the kernel map.
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*
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* => we can sleep if needed
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*/
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vaddr_t
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uvm_km_alloc1(map, size, zeroit)
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struct vm_map *map;
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vsize_t size;
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boolean_t zeroit;
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{
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vaddr_t kva, loopva, offset;
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struct vm_page *pg;
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UVMHIST_FUNC("uvm_km_alloc1"); UVMHIST_CALLED(maphist);
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UVMHIST_LOG(maphist,"(map=0x%x, size=0x%x)", map, size,0,0);
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KASSERT(vm_map_pmap(map) == pmap_kernel());
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size = round_page(size);
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kva = vm_map_min(map); /* hint */
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/*
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* allocate some virtual space
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*/
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if (__predict_false(uvm_map(map, &kva, size, uvm.kernel_object,
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UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL,
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UVM_INH_NONE, UVM_ADV_RANDOM,
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0)) != 0)) {
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UVMHIST_LOG(maphist,"<- done (no VM)",0,0,0,0);
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return(0);
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}
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/*
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* recover object offset from virtual address
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*/
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offset = kva - vm_map_min(kernel_map);
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UVMHIST_LOG(maphist," kva=0x%x, offset=0x%x", kva, offset,0,0);
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/*
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* now allocate the memory.
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*/
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loopva = kva;
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while (size) {
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simple_lock(&uvm.kernel_object->vmobjlock);
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KASSERT(uvm_pagelookup(uvm.kernel_object, offset) == NULL);
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pg = uvm_pagealloc(uvm.kernel_object, offset, NULL, 0);
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if (pg) {
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pg->flags &= ~PG_BUSY;
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UVM_PAGE_OWN(pg, NULL);
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}
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simple_unlock(&uvm.kernel_object->vmobjlock);
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if (pg == NULL) {
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uvm_wait("km_alloc1w");
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continue;
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}
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pmap_enter(map->pmap, loopva, VM_PAGE_TO_PHYS(pg),
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UVM_PROT_ALL, PMAP_WIRED | VM_PROT_READ | VM_PROT_WRITE);
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loopva += PAGE_SIZE;
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offset += PAGE_SIZE;
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size -= PAGE_SIZE;
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}
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pmap_update(map->pmap);
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/*
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* zero on request (note that "size" is now zero due to the above loop
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* so we need to subtract kva from loopva to reconstruct the size).
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*/
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if (zeroit)
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memset((caddr_t)kva, 0, loopva - kva);
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UVMHIST_LOG(maphist,"<- done (kva=0x%x)", kva,0,0,0);
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return(kva);
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}
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/*
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* uvm_km_valloc: allocate zero-fill memory in the kernel's address space
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*
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* => memory is not allocated until fault time
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*/
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vaddr_t
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uvm_km_valloc(map, size)
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struct vm_map *map;
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vsize_t size;
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{
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return(uvm_km_valloc_align(map, size, 0));
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}
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vaddr_t
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uvm_km_valloc_align(map, size, align)
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struct vm_map *map;
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vsize_t size;
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vsize_t align;
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{
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vaddr_t kva;
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UVMHIST_FUNC("uvm_km_valloc"); UVMHIST_CALLED(maphist);
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UVMHIST_LOG(maphist, "(map=0x%x, size=0x%x)", map, size, 0,0);
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KASSERT(vm_map_pmap(map) == pmap_kernel());
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size = round_page(size);
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kva = vm_map_min(map); /* hint */
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/*
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* allocate some virtual space. will be demand filled by kernel_object.
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*/
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if (__predict_false(uvm_map(map, &kva, size, uvm.kernel_object,
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UVM_UNKNOWN_OFFSET, align, UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL,
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UVM_INH_NONE, UVM_ADV_RANDOM,
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0)) != 0)) {
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UVMHIST_LOG(maphist, "<- done (no VM)", 0,0,0,0);
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return(0);
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}
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UVMHIST_LOG(maphist, "<- done (kva=0x%x)", kva,0,0,0);
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return(kva);
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}
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/*
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* uvm_km_valloc_wait: allocate zero-fill memory in the kernel's address space
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*
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* => memory is not allocated until fault time
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* => if no room in map, wait for space to free, unless requested size
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* is larger than map (in which case we return 0)
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*/
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vaddr_t
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uvm_km_valloc_prefer_wait(map, size, prefer)
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struct vm_map *map;
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vsize_t size;
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voff_t prefer;
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{
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vaddr_t kva;
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UVMHIST_FUNC("uvm_km_valloc_prefer_wait"); UVMHIST_CALLED(maphist);
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UVMHIST_LOG(maphist, "(map=0x%x, size=0x%x)", map, size, 0,0);
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KASSERT(vm_map_pmap(map) == pmap_kernel());
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size = round_page(size);
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if (size > vm_map_max(map) - vm_map_min(map))
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return(0);
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for (;;) {
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kva = vm_map_min(map); /* hint */
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/*
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* allocate some virtual space. will be demand filled
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* by kernel_object.
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*/
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if (__predict_true(uvm_map(map, &kva, size, uvm.kernel_object,
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prefer, 0, UVM_MAPFLAG(UVM_PROT_ALL,
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UVM_PROT_ALL, UVM_INH_NONE, UVM_ADV_RANDOM, 0))
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== 0)) {
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UVMHIST_LOG(maphist,"<- done (kva=0x%x)", kva,0,0,0);
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return(kva);
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}
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/*
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* failed. sleep for a while (on map)
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*/
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UVMHIST_LOG(maphist,"<<<sleeping>>>",0,0,0,0);
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tsleep((caddr_t)map, PVM, "vallocwait", 0);
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}
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/*NOTREACHED*/
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}
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vaddr_t
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uvm_km_valloc_wait(map, size)
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struct vm_map *map;
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vsize_t size;
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{
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return uvm_km_valloc_prefer_wait(map, size, UVM_UNKNOWN_OFFSET);
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}
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/* Sanity; must specify both or none. */
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#if (defined(PMAP_MAP_POOLPAGE) || defined(PMAP_UNMAP_POOLPAGE)) && \
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(!defined(PMAP_MAP_POOLPAGE) || !defined(PMAP_UNMAP_POOLPAGE))
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#error Must specify MAP and UNMAP together.
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#endif
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/*
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* uvm_km_alloc_poolpage: allocate a page for the pool allocator
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*
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* => if the pmap specifies an alternate mapping method, we use it.
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*/
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/* ARGSUSED */
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vaddr_t
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uvm_km_alloc_poolpage1(map, obj, waitok)
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struct vm_map *map;
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struct uvm_object *obj;
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boolean_t waitok;
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{
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#if defined(PMAP_MAP_POOLPAGE)
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struct vm_page *pg;
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vaddr_t va;
|
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again:
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pg = uvm_pagealloc(NULL, 0, NULL, UVM_PGA_USERESERVE);
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if (__predict_false(pg == NULL)) {
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if (waitok) {
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uvm_wait("plpg");
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goto again;
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} else
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return (0);
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}
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va = PMAP_MAP_POOLPAGE(VM_PAGE_TO_PHYS(pg));
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if (__predict_false(va == 0))
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uvm_pagefree(pg);
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return (va);
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#else
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vaddr_t va;
|
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int s;
|
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/*
|
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* NOTE: We may be called with a map that doens't require splvm
|
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* protection (e.g. kernel_map). However, it does not hurt to
|
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* go to splvm in this case (since unprocted maps will never be
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* accessed in interrupt context).
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*
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* XXX We may want to consider changing the interface to this
|
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* XXX function.
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*/
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s = splvm();
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va = uvm_km_kmemalloc(map, obj, PAGE_SIZE, waitok ? 0 : UVM_KMF_NOWAIT);
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splx(s);
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return (va);
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#endif /* PMAP_MAP_POOLPAGE */
|
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}
|
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|
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/*
|
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* uvm_km_free_poolpage: free a previously allocated pool page
|
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*
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* => if the pmap specifies an alternate unmapping method, we use it.
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*/
|
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/* ARGSUSED */
|
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void
|
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uvm_km_free_poolpage1(map, addr)
|
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struct vm_map *map;
|
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vaddr_t addr;
|
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{
|
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#if defined(PMAP_UNMAP_POOLPAGE)
|
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paddr_t pa;
|
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|
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pa = PMAP_UNMAP_POOLPAGE(addr);
|
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uvm_pagefree(PHYS_TO_VM_PAGE(pa));
|
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#else
|
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int s;
|
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|
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/*
|
|
* NOTE: We may be called with a map that doens't require splvm
|
|
* protection (e.g. kernel_map). However, it does not hurt to
|
|
* go to splvm in this case (since unprocted maps will never be
|
|
* accessed in interrupt context).
|
|
*
|
|
* XXX We may want to consider changing the interface to this
|
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* XXX function.
|
|
*/
|
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|
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s = splvm();
|
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uvm_km_free(map, addr, PAGE_SIZE);
|
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splx(s);
|
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#endif /* PMAP_UNMAP_POOLPAGE */
|
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}
|