vmparam.h revision 1.14 
1/*	$NetBSD: vmparam.h,v 1.14 2010/11/06 15:42:49 uebayasi Exp $	*/
2
3/*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/*
30 * Machine dependent constants for Sun2
31 *
32 * The Sun2 has limited total kernel virtual space (14MB) and
33 * can not use main memory for page tables.  (All active PTEs
34 * must be installed in special translation RAM in the MMU).
35 * Therefore, parameters that would normally configure the
36 * size of various page tables are irrelevant.  Only things
37 * that consume portions of kernel virtual (KV) space matter,
38 * and those things should be chosen to conserve KV space.
39 */
40
41/*
42 * The Sun2 has 2K pages.  Override PAGE_* to be compile-time constants.
43 */
44#define	PAGE_SHIFT	11
45#define	PAGE_SIZE	(1 << PAGE_SHIFT)
46#define	PAGE_MASK	(PAGE_SIZE - 1)
47
48/*
49 * We definitely need a small pager map.
50 */
51#define	PAGER_MAP_DEFAULT_SIZE (1 * 1024 * 1024)
52
53/*
54 * USRSTACK is the top (end) of the user stack.
55 */
56#define	USRSTACK	0x1000000	/* High end of user stack */
57
58/*
59 * Virtual memory related constants, all in bytes.
60 * The Sun2 has only 16 MB of user-virtual space,
61 * so we need to be conservative with these limits.
62 */
63#ifndef MAXTSIZ
64#define	MAXTSIZ		(5*1024*1024)		/* max text size */
65#endif
66#ifndef DFLDSIZ
67#define	DFLDSIZ		(4*1024*1024)		/* initial data size limit */
68#endif
69#ifndef MAXDSIZ
70#define	MAXDSIZ		(6*1024*1024)		/* max data size */
71#endif
72#ifndef	DFLSSIZ
73#define	DFLSSIZ		(512*1024)		/* initial stack size limit */
74#endif
75#ifndef	MAXSSIZ
76#define	MAXSSIZ		(4*1024*1024)		/* max stack size */
77#endif
78
79/*
80 * PTEs for mapping user space into the kernel for phyio operations.
81 * The actual limitation for physio requests will be the DVMA space,
82 * and that is fixed by hardware design at 256K.  We could make the
83 * physio map larger than that, but it would not buy us much.
84 */
85#ifndef USRIOSIZE
86#define USRIOSIZE	128		/* 256K */
87#endif
88
89/*
90 * Mach-derived constants:
91 */
92
93/* user/kernel map constants */
94#define VM_MIN_ADDRESS		((vaddr_t)0)
95#define VM_MAX_ADDRESS		((vaddr_t)USRSTACK)
96#define VM_MAXUSER_ADDRESS	((vaddr_t)USRSTACK)
97#define VM_MIN_KERNEL_ADDRESS	((vaddr_t)KERNBASE)
98#define VM_MAX_KERNEL_ADDRESS	((vaddr_t)KERN_END)
99
100/* virtual sizes (bytes) for various kernel submaps */
101#define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
102
103#define VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
104
105#define	VM_NFREELIST		1
106#define	VM_FREELIST_DEFAULT	0
107
108#ifdef	_LKM
109#undef	KERNBASE
110extern	char KERNBASE[];
111#endif	/* _LKM */
112
113/* This is needed by some LKMs. */
114#define VM_PHYSSEG_MAX		4
115