2 * Copyright (c) 1988 University of Utah.
3 * Copyright (c) 1992, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
8 * Science Department and Ralph Campbell.
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 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * from: Utah $Hdr: vmparam.h 1.16 91/01/18$
36 * @(#)vmparam.h 8.2 (Berkeley) 4/22/94
41 #ifndef _MACHINE_VMPARAM_H_
42 #define _MACHINE_VMPARAM_H_
45 * USRSTACK is the top (end) of the user stack. Immediately above the user
46 * stack resides the syscall gateway page.
48 #define USRSTACK VM_MAX_ADDRESS
51 * Virtual memory related constants, all in bytes
54 #define MAXTSIZ (1<<30) /* max text size (1G) */
57 #define DFLDSIZ (1<<27) /* initial data size (128M) */
60 #define MAXDSIZ (1<<30) /* max data size (1G) */
63 #define DFLSSIZ (1<<21) /* initial stack size (2M) */
66 #define MAXSSIZ (1<<28) /* max stack size (256M) */
69 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
73 * The time for a process to be blocked before being very swappable.
74 * This is a number of seconds which the system takes as being a non-trivial
75 * amount of real time. You probably shouldn't change this;
76 * it is used in subtle ways (fractions and multiples of it are, that is, like
77 * half of a ``long time'', almost a long time, etc.)
78 * It is related to human patience and other factors which don't really
84 * We need region 7 virtual addresses for pagetables.
86 #define UMA_MD_SMALL_ALLOC
89 * The physical address space is sparsely populated.
91 #define VM_PHYSSEG_SPARSE
94 * The number of PHYSSEG entries is equal to the number of phys_avail
97 #define VM_PHYSSEG_MAX 49
100 * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
101 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
102 * the pool from which physical pages for small UMA objects are
105 #define VM_NFREEPOOL 3
106 #define VM_FREEPOOL_CACHE 2
107 #define VM_FREEPOOL_DEFAULT 0
108 #define VM_FREEPOOL_DIRECT 1
111 * Create one free page list.
113 #define VM_NFREELIST 1
114 #define VM_FREELIST_DEFAULT 0
117 * An allocation size of 256MB is supported in order to optimize the
118 * use of the identity mappings in region 7 by UMA.
120 #define VM_NFREEORDER 16
123 * Disable superpage reservations.
125 #ifndef VM_NRESERVLEVEL
126 #define VM_NRESERVLEVEL 0
130 * Manipulating region bits of an address.
132 #define IA64_RR_BASE(n) (((u_int64_t) (n)) << 61)
133 #define IA64_RR_MASK(x) ((x) & ((1L << 61) - 1))
135 #define IA64_PHYS_TO_RR7(x) ((x) | IA64_RR_BASE(7))
138 * Page size of the identity mappings in region 7.
140 #ifndef LOG2_ID_PAGE_SIZE
141 #define LOG2_ID_PAGE_SIZE 28 /* 256M */
144 #define IA64_ID_PAGE_SHIFT (LOG2_ID_PAGE_SIZE)
145 #define IA64_ID_PAGE_SIZE (1<<(LOG2_ID_PAGE_SIZE))
146 #define IA64_ID_PAGE_MASK (IA64_ID_PAGE_SIZE-1)
148 #define IA64_BACKINGSTORE IA64_RR_BASE(4)
151 * Mach derived constants
154 /* user/kernel map constants */
155 #define VM_MIN_ADDRESS 0
156 #define VM_MAX_ADDRESS IA64_RR_BASE(5)
157 #define VM_GATEWAY_SIZE PAGE_SIZE
158 #define VM_MAXUSER_ADDRESS (VM_MAX_ADDRESS + VM_GATEWAY_SIZE)
159 #define VM_MIN_KERNEL_ADDRESS VM_MAXUSER_ADDRESS
160 #define VM_MAX_KERNEL_ADDRESS (IA64_RR_BASE(6) - 1)
162 #define KERNBASE VM_MAX_ADDRESS
164 /* virtual sizes (bytes) for various kernel submaps */
166 #define VM_KMEM_SIZE (12 * 1024 * 1024)
170 * How many physical pages per KVA page allocated.
171 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
172 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
173 * is the total KVA space allocated for kmem_map.
175 #ifndef VM_KMEM_SIZE_SCALE
176 #define VM_KMEM_SIZE_SCALE (4) /* XXX 8192 byte pages */
179 /* initial pagein size of beginning of executable file */
180 #ifndef VM_INITIAL_PAGEIN
181 #define VM_INITIAL_PAGEIN 16
184 #endif /* !_MACHINE_VMPARAM_H_ */