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 #ifdef __cplusplus
32 extern "C" {
33 #endif
34
35 /*
36 * Machine dependent constants for PC.
37 */
38
39 /*
40 * USRTEXT is the start of the user text/data space.
41 */
42 #define USRTEXT USRSTACK
43
44 /*
45 * Virtual memory related constants for UNIX resource control, all in bytes.
46 * The default stack size (initial stack size limit) keeps the stack from
47 * taking more than 2 page directory entries in addition to the part of
48 * the page directory entry which also maps the initial text and data,
49 * and makes the default slightly bigger than the 8MB on SPARC.
50 */
51 #ifdef __amd64
52 /*
53 * On amd64, the stack grows down from just below KERNELBASE (see the
54 * definition of USERLIMIT in i86pc/sys/machparam.h). Theoretically,
55 * it could grow down to the top of the VA hole (0xffff800000000000),
56 * giving it a possible maximum of about 125T. For an amd64 xpv
57 * kernel, all user VA space is below the VA hole. The theoretical
58 * maximum for the stack is about the same, although it can't grow
59 * to quite that size, since it would clash with the heap.
60 *
61 * Pick an upper limit that will work in both cases: 32T.
62 *
63 * For 32bit processes, the stack is below the text segment.
64 */
65 #define MAXSSIZ (32ULL * 1024ULL * 1024ULL * 1024ULL * 1024ULL)
66 #else
67 #define MAXSSIZ (USRSTACK - 1024*1024)
68 #endif /* __amd64 */
69 #define DFLSSIZ (8*1024*1024 + ((USRSTACK) & 0x3FFFFF))
70
71 /*
72 * Size of the kernel segkmem system pte table. This virtual
73 * space is controlled by the resource map "kernelmap".
74 */
75 #define SYSPTSIZE ((61*1024*1024) / MMU_PAGESIZE)
76
77 /*
78 * Size of the ethernet addressable kernel segkmem system pte table.
79 * This virtual space is controlled by the resource map "ekernelmap".
80 * The ethernet interfaces in some sun machines can address only
81 * the upper 16 Megabytes of memory. Since the ethernet
82 * driver kmem_allocs its memory, we bias all kmem_allocs
83 * to try ekernelmap first and if it fails try kernelmap.
84 * Folks that allocate directly out of kernelmap, above,
85 * get memory that is non-ethernet addressable.
86 */
87 #define E_SYSPTSIZE (0x2000000 / MMU_PAGESIZE)
88
89 /*
90 * The virtual address space to be used by the seg_map segment
91 * driver for fast kernel mappings.
92 */
93 #if defined(__i386)
94 #define SEGMAPDEFAULT (16 * 1024 * 1024)
95 #define SEGMAPMAX (128 * 1024 * 1024)
96 #else
97 #define SEGMAPDEFAULT (64 * 1024 * 1024)
98 #endif
99
100 /*
101 * The time for a process to be blocked before being very swappable.
102 * This is a number of seconds which the system takes as being a non-trivial
103 * amount of real time. You probably shouldn't change this;
104 * it is used in subtle ways (fractions and multiples of it are, that is, like
105 * half of a ``long time'', almost a long time, etc.)
106 * It is related to human patience and other factors which don't really
107 * change over time.
108 */
109 #define MAXSLP 20
110
111 /*
112 * A swapped in process is given a small amount of core without being bothered
113 * by the page replacement algorithm. Basically this says that if you are
114 * swapped in you deserve some resources. We protect the last SAFERSS
115 * pages against paging and will just swap you out rather than paging you.
116 * Note that each process has at least UPAGES pages which are not
117 * paged anyways so this number just means a swapped in process is
118 * given around 32k bytes.
119 */
120 /*
121 * nominal ``small'' resident set size
122 * protected against replacement
123 */
124 #define SAFERSS 3
125
126 /*
127 * DISKRPM is used to estimate the number of paging i/o operations
128 * which one can expect from a single disk controller.
129 *
130 * XXX - The system doesn't account for multiple swap devices.
131 */
132 #define DISKRPM 60
133
134 /*
135 * The maximum value for handspreadpages which is the the distance
136 * between the two clock hands in pages.
137 */
138 #define MAXHANDSPREADPAGES ((64 * 1024 * 1024) / PAGESIZE)
139
140 /*
141 * Paged text files that are less than PGTHRESH bytes
142 * may be "prefaulted in" instead of demand paged.
143 */
144 #define PGTHRESH (280 * 1024)
145
146 #ifdef __cplusplus
147 }
148 #endif
149
150 #endif /* _SYS_VM_MACHPARAM_H */