vmparam3.h revision 1.31 
1/*	$NetBSD: vmparam3.h,v 1.31 2002/12/10 05:14:35 thorpej Exp $	*/
2
3/*
4 * Copyright (c) 1994 Gordon W. Ross
5 * Copyright (c) 1993 Adam Glass
6 * Copyright (c) 1988 University of Utah.
7 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * the Systems Programming Group of the University of Utah Computer
12 * Science Department.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 *    notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 *    notice, this list of conditions and the following disclaimer in the
21 *    documentation and/or other materials provided with the distribution.
22 * 3. All advertising materials mentioning features or use of this software
23 *    must display the following acknowledgement:
24 *	This product includes software developed by the University of
25 *	California, Berkeley and its contributors.
26 * 4. Neither the name of the University nor the names of its contributors
27 *    may be used to endorse or promote products derived from this software
28 *    without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 *
42 *	from: Utah $Hdr: vmparam.h 1.16 91/01/18$
43 *	from: @(#)vmparam.h	7.3 (Berkeley) 5/7/91
44 *	vmparam.h,v 1.2 1993/05/22 07:58:38 cgd Exp
45 */
46
47/*
48 * Machine dependent constants for Sun3
49 *
50 * The Sun3 has limited total kernel virtual space (32MB) and
51 * can not use main memory for page tables.  (All active PTEs
52 * must be installed in special translation RAM in the MMU).
53 * Therefore, parameters that would normally configure the
54 * size of various page tables are irrelevant.  Only things
55 * that consume portions of kernel virtual (KV) space matter,
56 * and those things should be chosen to conserve KV space.
57 */
58
59/*
60 * USRSTACK is the top (end) of the user stack.
61 */
62#define	USRSTACK	KERNBASE	/* High end of user stack */
63
64/*
65 * Virtual memory related constants, all in bytes.
66 * The Sun3 has only 224 MB of user-virtual space,
67 * so we need to be conservative with these limits.
68 */
69#ifndef MAXTSIZ
70#define	MAXTSIZ		(8*1024*1024)		/* max text size */
71#endif
72#ifndef DFLDSIZ
73#define	DFLDSIZ		(16*1024*1024)		/* initial data size limit */
74#endif
75#ifndef MAXDSIZ
76#define	MAXDSIZ		(32*1024*1024)		/* max data size */
77#endif
78#ifndef	DFLSSIZ
79#define	DFLSSIZ		(512*1024)		/* initial stack size limit */
80#endif
81#ifndef	MAXSSIZ
82#define	MAXSSIZ		MAXDSIZ			/* max stack size */
83#endif
84
85/*
86 * PTEs for mapping user space into the kernel for phyio operations.
87 * The actual limitation for physio requests will be the DVMA space,
88 * and that is fixed by hardware design at 1MB.  We could make the
89 * physio map larger than that, but it would not buy us much.
90 */
91#ifndef USRIOSIZE
92#define USRIOSIZE	128		/* 1 MB */
93#endif
94
95/*
96 * PTEs for system V style shared memory.
97 * This is basically slop for kmempt which we actually allocate (malloc) from.
98 */
99#ifndef SHMMAXPGS
100#define SHMMAXPGS	512 	/* 4 MB */
101#endif
102
103#define	PAGER_MAP_SIZE (4 * 1024 * 1024)
104