2 * Copyright (c) 1990 The Regents of the University of California.
4 * Copyright (c) 1994 John S. Dyson
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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38 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
39 * $FreeBSD: src/sys/i386/include/vmparam.h,v 1.32.2.1 2000/04/02 08:47:01 peter Exp $
40 * $DragonFly: src/sys/platform/pc32/include/vmparam.h,v 1.7 2006/05/20 02:42:06 dillon Exp $
44 #ifndef _MACHINE_VMPARAM_H_
45 #define _MACHINE_VMPARAM_H_
48 * Machine dependent constants for 386.
51 #define VM_PROT_READ_IS_EXEC /* if you can read -- then you can exec */
54 * Virtual memory related constants, all in bytes
56 #define MAXTSIZ (128UL*1024*1024) /* max text size */
58 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
61 #define MAXDSIZ (512UL*1024*1024) /* max data size */
64 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
67 #define MAXSSIZ (64UL*1024*1024) /* max stack size */
70 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
73 #define USRTEXT (1*PAGE_SIZE) /* base of user text XXX bogus */
76 * The time for a process to be blocked before being very swappable.
77 * This is a number of seconds which the system takes as being a non-trivial
78 * amount of real time. You probably shouldn't change this;
79 * it is used in subtle ways (fractions and multiples of it are, that is, like
80 * half of a ``long time'', almost a long time, etc.)
81 * It is related to human patience and other factors which don't really
88 * Virtual addresses of things. Derived from the page directory and
89 * page table indexes from pmap.h for precision.
90 * Because of the page that is both a PD and PT, it looks a little
91 * messy at times, but hey, we'll do anything to save a page :-)
94 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1)
95 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI)
97 #define KERNBASE VADDR(KPTDI, 0)
99 #define KPT_MAX_ADDRESS VADDR(PTDPTDI, KPTDI+NKPT)
100 #define KPT_MIN_ADDRESS VADDR(PTDPTDI, KPTDI)
102 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
103 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
105 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0)
107 #define USRSTACK VM_MAXUSER_ADDRESS
109 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
110 #define VM_MIN_ADDRESS ((vm_offset_t)0)
112 /* initial pagein size of beginning of executable file */
113 #ifndef VM_INITIAL_PAGEIN
114 #define VM_INITIAL_PAGEIN 16
117 #endif /* _MACHINE_VMPARAM_H_ */