vmparam.h revision 24696 
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 * Copyright (c) 1994 John S. Dyson
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 *	from: @(#)vmparam.h	5.9 (Berkeley) 5/12/91
39 *	$Id: vmparam.h,v 1.24 1997/02/22 09:35:23 peter Exp $
40 */
41
42
43#ifndef _MACHINE_VMPARAM_H_
44#define _MACHINE_VMPARAM_H_ 1
45
46/*
47 * Machine dependent constants for 386.
48 */
49
50#define VM_PROT_READ_IS_EXEC	/* if you can read -- then you can exec */
51
52/*
53 * Virtual memory related constants, all in bytes
54 */
55#define	MAXTSIZ		(16UL*1024*1024)	/* max text size */
56#ifndef DFLDSIZ
57#define	DFLDSIZ		(64UL*1024*1024)	/* initial data size limit */
58#endif
59#ifndef MAXDSIZ
60#define	MAXDSIZ		(128UL*1024*1024)	/* max data size */
61#endif
62#ifndef	DFLSSIZ
63#define	DFLSSIZ		(8UL*1024*1024)		/* initial stack size limit */
64#endif
65#ifndef	MAXSSIZ
66#define	MAXSSIZ		(64UL*1024*1024)	/* max stack size */
67#endif
68#ifndef SGROWSIZ
69#define SGROWSIZ	(128UL*1024)		/* amount to grow stack */
70#endif
71
72#define USRTEXT		(1*PAGE_SIZE)		/* base of user text XXX bogus */
73
74/*
75 * Size of the Shared Memory Pages page table.
76 */
77#ifndef	SHMMAXPGS
78#define	SHMMAXPGS	1024		/* XXX until we have more kmap space */
79#endif
80
81/*
82 * The time for a process to be blocked before being very swappable.
83 * This is a number of seconds which the system takes as being a non-trivial
84 * amount of real time.  You probably shouldn't change this;
85 * it is used in subtle ways (fractions and multiples of it are, that is, like
86 * half of a ``long time'', almost a long time, etc.)
87 * It is related to human patience and other factors which don't really
88 * change over time.
89 */
90#define	MAXSLP 		20
91
92
93/*
94 * Virtual addresses of things.  Derived from the page directory and
95 * page table indexes from pmap.h for precision.
96 * Because of the page that is both a PD and PT, it looks a little
97 * messy at times, but hey, we'll do anything to save a page :-)
98 */
99
100#define VM_MAX_KERNEL_ADDRESS	VADDR(KPTDI+NKPDE, 0)
101#define VM_MIN_KERNEL_ADDRESS	VADDR(PTDPTDI, PTDPTDI)
102
103#define	KERNBASE		VADDR(KPTDI, 0)
104
105#define KPT_MAX_ADDRESS		VADDR(PTDPTDI, KPTDI+NKPT)
106#define KPT_MIN_ADDRESS		VADDR(PTDPTDI, KPTDI)
107
108#define UPT_MAX_ADDRESS		VADDR(PTDPTDI, PTDPTDI)
109#define UPT_MIN_ADDRESS		VADDR(PTDPTDI, 0)
110
111#define VM_MAXUSER_ADDRESS	VADDR(UMAXPTDI, UMAXPTEOFF)
112
113#define USRSTACK		VM_MAXUSER_ADDRESS
114
115#define VM_MAX_ADDRESS		VADDR(PTDPTDI, PTDPTDI)
116#define VM_MIN_ADDRESS		((vm_offset_t)0)
117
118/* virtual sizes (bytes) for various kernel submaps */
119#define VM_KMEM_SIZE		(32 * 1024 * 1024)
120
121#endif /* _MACHINE_VMPARAM_H_ */
122