1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*	Copyright (c) 1988 AT&T	*/
22/*	  All Rights Reserved  	*/
23/*
24 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28#ifndef _SYS_VM_MACHPARAM_H
29#define	_SYS_VM_MACHPARAM_H
30
31#pragma ident	"%Z%%M%	%I%	%E% SMI"
32
33#ifdef	__cplusplus
34extern "C" {
35#endif
36
37/*
38 * Machine dependent constants for PC.
39 */
40
41/*
42 * USRTEXT is the start of the user text/data space.
43 */
44#define	USRTEXT		USRSTACK
45
46/*
47 * Virtual memory related constants for UNIX resource control, all in bytes.
48 * The default stack size (initial stack size limit) keeps the stack from
49 * taking more than 2 page directory entries in addition to the part of
50 * the page directory entry which also maps the initial text and data,
51 * and makes the default slightly bigger than the 8MB on SPARC.
52 */
53#ifdef __amd64
54/*
55 * On amd64, the stack grows down from just below KERNELBASE (see the
56 * definition of USERLIMIT in i86pc/sys/machparam.h). Theoretically,
57 * it could grow down to the top of the VA hole (0xffff800000000000),
58 * giving it a possible maximum of about 125T. For an amd64 xpv
59 * kernel, all user VA space is below the VA hole. The theoretical
60 * maximum for the stack is about the same, although it can't grow
61 * to quite that size, since it would clash with the heap.
62 *
63 * Pick an upper limit that will work in both cases: 32T.
64 *
65 * For 32bit processes, the stack is below the text segment.
66 */
67#define	MAXSSIZ		(32ULL * 1024ULL * 1024ULL * 1024ULL * 1024ULL)
68#else
69#define	MAXSSIZ		(USRSTACK - 1024*1024)
70#endif /* __amd64 */
71#define	DFLSSIZ		(8*1024*1024 + ((USRSTACK) & 0x3FFFFF))
72
73/*
74 * The following are limits beyond which the hard or soft limits for stack
75 * and data cannot be increased. These may be viewed as fundamental
76 * characteristics of the system. Note: a bug in SVVS requires that the
77 * default hard limit be increasable, so the default hard limit must be
78 * less than these physical limits.
79 */
80#define	DSIZE_LIMIT	(USERLIMIT-USRTEXT)	/* physical data limit */
81#define	SSIZE_LIMIT	(USRSTACK)		/* physical stack limit */
82
83/*
84 * Size of the kernel segkmem system pte table.  This virtual
85 * space is controlled by the resource map "kernelmap".
86 */
87#define	SYSPTSIZE	((61*1024*1024) / MMU_PAGESIZE)
88
89/*
90 * Size of the ethernet addressable kernel segkmem system pte table.
91 * This virtual space is controlled by the resource map "ekernelmap".
92 * The ethernet interfaces in some sun machines can address only
93 * the upper 16 Megabytes of memory.  Since the ethernet
94 * driver kmem_allocs its memory, we bias all kmem_allocs
95 * to try ekernelmap first and if it fails try kernelmap.
96 * Folks that allocate directly out of kernelmap, above,
97 * get memory that is non-ethernet addressable.
98 */
99#define	E_SYSPTSIZE	(0x2000000 / MMU_PAGESIZE)
100
101/*
102 * The virtual address space to be used by the seg_map segment
103 * driver for fast kernel mappings.
104 */
105#if defined(__i386)
106#define	SEGMAPDEFAULT	(16 * 1024 * 1024)
107#define	SEGMAPMAX	(128 * 1024 * 1024)
108#else
109#define	SEGMAPDEFAULT	(64 * 1024 * 1024)
110#endif
111
112/*
113 * The time for a process to be blocked before being very swappable.
114 * This is a number of seconds which the system takes as being a non-trivial
115 * amount of real time. You probably shouldn't change this;
116 * it is used in subtle ways (fractions and multiples of it are, that is, like
117 * half of a ``long time'', almost a long time, etc.)
118 * It is related to human patience and other factors which don't really
119 * change over time.
120 */
121#define	MAXSLP 		20
122
123/*
124 * A swapped in process is given a small amount of core without being bothered
125 * by the page replacement algorithm. Basically this says that if you are
126 * swapped in you deserve some resources. We protect the last SAFERSS
127 * pages against paging and will just swap you out rather than paging you.
128 * Note that each process has at least UPAGES pages which are not
129 * paged anyways so this number just means a swapped in process is
130 * given around 32k bytes.
131 */
132/*
133 * nominal ``small'' resident set size
134 * protected against replacement
135 */
136#define	SAFERSS		3
137
138/*
139 * DISKRPM is used to estimate the number of paging i/o operations
140 * which one can expect from a single disk controller.
141 *
142 * XXX - The system doesn't account for multiple swap devices.
143 */
144#define	DISKRPM		60
145
146/*
147 * The maximum value for handspreadpages which is the the distance
148 * between the two clock hands in pages.
149 */
150#define	MAXHANDSPREADPAGES	((64 * 1024 * 1024) / PAGESIZE)
151
152/*
153 * Paged text files that are less than PGTHRESH bytes
154 * may be "prefaulted in" instead of demand paged.
155 */
156#define	PGTHRESH	(280 * 1024)
157
158#ifdef	__cplusplus
159}
160#endif
161
162#endif	/* _SYS_VM_MACHPARAM_H */
163