1/* $OpenBSD: uvm_km.h,v 1.15 2017/05/11 00:42:05 dlg Exp $ */
2/* $NetBSD: uvm_km.h,v 1.9 1999/06/21 17:25:11 thorpej Exp $ */
3
4/*
5 * Copyright (c) 1997 Charles D. Cranor and Washington University.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * from: Id: uvm_km.h,v 1.1.2.2 1997/12/30 12:03:15 mrg Exp
29 */
30
31#ifndef _UVM_UVM_KM_H_
32#define _UVM_UVM_KM_H_
33
34/*
35 * uvm_km.h
36 */
37
38#ifdef _KERNEL
39
40#include <sys/mutex.h>
41
42/*
43 * prototypes
44 */
45
46void uvm_km_init(vaddr_t, vaddr_t, vaddr_t);
47void uvm_km_page_init(void);
48void uvm_km_page_lateinit(void);
49void uvm_km_pgremove(struct uvm_object *, vaddr_t, vaddr_t);
50void uvm_km_pgremove_intrsafe(vaddr_t, vaddr_t);
51
52#if !defined(__HAVE_PMAP_DIRECT)
53
54#define UVM_KM_PAGES_LOWAT_MAX (2048)
55#define UVM_KM_PAGES_HIWAT_MAX (4 * UVM_KM_PAGES_LOWAT_MAX)
56
57struct uvm_km_free_page {
58 struct uvm_km_free_page *next;
59};
60struct uvm_km_pages {
61 struct mutex mtx;
62
63 /* Low and high water mark for addresses. */
64 int lowat;
65 int hiwat;
66
67 /* Kernel address pool. */
68 int free;
69 vaddr_t page[UVM_KM_PAGES_HIWAT_MAX];
70
71 struct uvm_km_free_page *freelist;
72 int freelistlen;
73
74 struct proc *km_proc;
75};
76
77extern struct uvm_km_pages uvm_km_pages;
78#endif /* _HAVE_PMAP_DIRECT */
79
80#endif /* _KERNEL */
81
82#endif /* _UVM_UVM_KM_H_ */