xref: /freebsd/sys/i386/include/vmparam.h (revision 61afd5bb22d787b0641523e7b9b95c964d669bd5)
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 1.21 1996/05/02 14:20:07 phk 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(KSTKPTDI, KSTKPTEOFF)
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