vmparam.h revision 1.20 
1/*	$NetBSD: vmparam.h,v 1.20 1999/04/26 22:46:47 thorpej Exp $ */
2
3/*
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
10 *
11 * All advertising materials mentioning features or use of this software
12 * must display the following acknowledgement:
13 *	This product includes software developed by the University of
14 *	California, Lawrence Berkeley Laboratory.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 *    notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 *    notice, this list of conditions and the following disclaimer in the
23 *    documentation and/or other materials provided with the distribution.
24 * 3. All advertising materials mentioning features or use of this software
25 *    must display the following acknowledgement:
26 *	This product includes software developed by the University of
27 *	California, Berkeley and its contributors.
28 * 4. Neither the name of the University nor the names of its contributors
29 *    may be used to endorse or promote products derived from this software
30 *    without specific prior written permission.
31 *
32 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
35 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 * SUCH DAMAGE.
43 *
44 *	@(#)vmparam.h	8.1 (Berkeley) 6/11/93
45 */
46
47/*
48 * Machine dependent constants for Sun-4c SPARC
49 */
50
51/*
52 * USRTEXT is the start of the user text/data space, while USRSTACK
53 * is the top (end) of the user stack.
54 */
55#define	USRTEXT		0x2000			/* Start of user text */
56#define	USRSTACK	KERNBASE		/* Start of user stack */
57
58/*
59 * Virtual memory related constants, all in bytes
60 */
61#ifndef MAXTSIZ
62#define	MAXTSIZ		(64*1024*1024)		/* max text size */
63#endif
64#ifndef DFLDSIZ
65#define	DFLDSIZ		(64*1024*1024)		/* initial data size limit */
66#endif
67#ifndef MAXDSIZ
68#define	MAXDSIZ		(256*1024*1024)		/* max data size */
69#endif
70#ifndef	DFLSSIZ
71#define	DFLSSIZ		(512*1024)		/* initial stack size limit */
72#endif
73#ifndef	MAXSSIZ
74#define	MAXSSIZ		MAXDSIZ			/* max stack size */
75#endif
76
77/*
78 * Size of shared memory map
79 */
80#ifndef SHMMAXPGS
81#define SHMMAXPGS	1024
82#endif
83
84/*
85 * The time for a process to be blocked before being very swappable.
86 * This is a number of seconds which the system takes as being a non-trivial
87 * amount of real time.  You probably shouldn't change this;
88 * it is used in subtle ways (fractions and multiples of it are, that is, like
89 * half of a ``long time'', almost a long time, etc.)
90 * It is related to human patience and other factors which don't really
91 * change over time.
92 */
93#define	MAXSLP 		20
94
95/*
96 * A swapped in process is given a small amount of core without being bothered
97 * by the page replacement algorithm.  Basically this says that if you are
98 * swapped in you deserve some resources.  We protect the last SAFERSS
99 * pages against paging and will just swap you out rather than paging you.
100 * Note that each process has at least UPAGES+CLSIZE pages which are not
101 * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
102 * number just means a swapped in process is given around 25k bytes.
103 * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
104 * so we loan each swapped in process memory worth 100$, or just admit
105 * that we don't consider it worthwhile and swap it out to disk which costs
106 * $30/mb or about $0.75.
107 * Update: memory prices have changed recently (9/96). At the current
108 * value of $6 per megabyte, we lend each swapped in process memory worth
109 * $0.15, or just admit that we don't consider it worthwhile and swap it out
110 * to disk which costs $0.20/MB, or just under half a cent.
111 */
112#define	SAFERSS		4		/* nominal ``small'' resident set size
113					   protected against replacement */
114
115/*
116 * Mach derived constants
117 */
118
119/*
120 * User/kernel map constants.  Note that sparc/vaddrs.h defines the
121 * IO space virtual base, which must be the same as VM_MAX_KERNEL_ADDRESS:
122 * tread with care.
123 */
124#define VM_MIN_ADDRESS		((vaddr_t)0)
125#define VM_MAX_ADDRESS		((vaddr_t)KERNBASE)
126#define VM_MAXUSER_ADDRESS	((vaddr_t)KERNBASE)
127#define VM_MIN_KERNEL_ADDRESS	((vaddr_t)KERNBASE)
128#define VM_MAX_KERNEL_ADDRESS	((vaddr_t)0xfe000000)
129
130/* virtual sizes (bytes) for various kernel submaps */
131#define VM_KMEM_SIZE		(NKMEMCLUSTERS*CLBYTES)
132
133#define MACHINE_NEW_NONCONTIG
134
135#define VM_PHYSSEG_MAX		32       /* up to 32 segments */
136#define VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
137#define VM_PHYSSEG_NOADD		/* can't add RAM after vm_mem_init */
138
139#define	VM_NFREELIST		1
140#define	VM_FREELIST_DEFAULT	0
141
142/*
143 * pmap specific data stored in the vm_physmem[] array
144 */
145struct pmap_physseg {
146	/* NULL */
147};
148