vmparam.h revision 1.2 
1/*	$NetBSD: vmparam.h,v 1.2 2000/02/11 19:25:16 thorpej Exp $	*/
2
3/*
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1982, 1986, 1990, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 *    must display the following acknowledgement:
22 *	This product includes software developed by the University of
23 *	California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 * from: Utah $Hdr: vmparam.h 1.16 91/01/18$
41 *
42 *	@(#)vmparam.h	8.2 (Berkeley) 4/19/94
43 */
44
45#ifndef _MACHINE_VMPARAM_H_
46#define _MACHINE_VMPARAM_H_
47
48/*
49 * USRTEXT is the start of the user text/data space, while USRSTACK
50 * is the top (end) of the user stack.
51 */
52#define USRTEXT		8192
53#define USRSTACK	VM_MAXUSER_ADDRESS
54
55/*
56 * Virtual memory related constants, all in bytes
57 */
58#ifndef MAXTSIZ
59#define MAXTSIZ		(8*1024*1024)		/* max text size */
60#endif
61#ifndef DFLDSIZ
62#define DFLDSIZ		(16*1024*1024)		/* initial data size limit */
63#endif
64#ifndef MAXDSIZ
65#define MAXDSIZ		(64*1024*1024)		/* max data size */
66#endif
67#ifndef	DFLSSIZ
68#define DFLSSIZ		(512*1024)		/* initial stack size limit */
69#endif
70#ifndef	MAXSSIZ
71#define MAXSSIZ		MAXDSIZ			/* max stack size */
72#endif
73
74/*
75 * Sizes of the system and user portions of the system page table.
76 */
77/* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
78#define SYSPTSIZE	(2 * NPTEPG)	/* 8mb */
79#define USRPTSIZE 	(1 * NPTEPG)	/* 4mb */
80
81/*
82 * PTEs for mapping user space into the kernel for phyio operations.
83 * One page is enough to handle 4Mb of simultaneous raw IO operations.
84 */
85#ifndef USRIOSIZE
86#define USRIOSIZE	(1 * NPTEPG)	/* 4mb */
87#endif
88
89/*
90 * PTEs for system V style shared memory.
91 * This is basically slop for kmempt which we actually allocate (malloc) from.
92 */
93#ifndef SHMMAXPGS
94#define SHMMAXPGS	1024		/* 8mb */
95#endif
96
97/*
98 * The time for a process to be blocked before being very swappable.
99 * This is a number of seconds which the system takes as being a non-trivial
100 * amount of real time.  You probably shouldn't change this;
101 * it is used in subtle ways (fractions and multiples of it are, that is, like
102 * half of a ``long time'', almost a long time, etc.)
103 * It is related to human patience and other factors which don't really
104 * change over time.
105 */
106#define MAXSLP 		20
107
108/* user/kernel map constants */
109#define VM_MIN_ADDRESS		((vaddr_t)0)
110#define VM_MAXUSER_ADDRESS	((vaddr_t)0xFFFC0000)
111#define VM_MAX_ADDRESS		((vaddr_t)0xFFFC0000)
112#define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
113#define VM_MAX_KERNEL_ADDRESS	((vaddr_t)(0-NBPG))
114
115/* virtual sizes (bytes) for various kernel submaps */
116#define VM_MBUF_SIZE		(NMBCLUSTERS*MCLBYTES)
117#define VM_PHYS_SIZE		(USRIOSIZE*NBPG)
118
119/* # of kernel PT pages (initial only, can grow dynamically) */
120#define VM_KERNEL_PT_PAGES	((vsize_t)2)		/* XXX: SYSPTSIZE */
121
122/*
123 * Constants which control the way the VM system deals with memory segments.
124 * Only one physical contigous memory segment.
125 */
126#define VM_PHYSSEG_MAX		1
127#define VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
128#define VM_PHYSSEG_NOADD
129
130#define VM_NFREELIST		1
131#define VM_FREELIST_DEFAULT	0
132
133/*
134 * pmap-specific data stored in the vm_physmem[] array.
135 */
136struct pmap_physseg {
137	struct pv_entry *pvent;		/* pv table for this seg */
138	char *attrs;			/* page attributes for this seg */
139};
140
141#endif /* _MACHINE_VMPARAM_H_ */
142