2 /* From: NetBSD: vmparam.h,v 1.6 1997/09/23 23:23:23 mjacob Exp */
3 #ifndef _MACHINE_VMPARAM_H
4 #define _MACHINE_VMPARAM_H
6 * Copyright (c) 1988 University of Utah.
7 * Copyright (c) 1992, 1993
8 * The Regents of the University of California. All rights reserved.
10 * This code is derived from software contributed to Berkeley by
11 * the Systems Programming Group of the University of Utah Computer
12 * Science Department and Ralph Campbell.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
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
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * from: Utah $Hdr: vmparam.h 1.16 91/01/18$
40 * @(#)vmparam.h 8.2 (Berkeley) 4/22/94
44 * Machine dependent constants for ia64.
47 * USRSTACK is the top (end) of the user stack. Immediately above the user
48 * stack resides the syscall gateway page.
50 #define USRSTACK VM_MAX_ADDRESS
53 * Virtual memory related constants, all in bytes
56 #define MAXTSIZ (1<<30) /* max text size (1G) */
59 #define DFLDSIZ (1<<27) /* initial data size (128M) */
62 #define MAXDSIZ (1<<30) /* max data size (1G) */
65 #define DFLSSIZ (1<<21) /* initial stack size (2M) */
68 #define MAXSSIZ (1<<28) /* max stack size (256M) */
71 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
75 * Boundary at which to place first MAPMEM segment if not explicitly
76 * specified. Should be a power of two. This allows some slop for
77 * the data segment to grow underneath the first mapped segment.
79 #define MMSEG 0x200000
82 * The size of the clock loop.
84 #define LOOPPAGES (maxfree - firstfree)
87 * The time for a process to be blocked before being very swappable.
88 * This is a number of seconds which the system takes as being a non-trivial
89 * amount of real time. You probably shouldn't change this;
90 * it is used in subtle ways (fractions and multiples of it are, that is, like
91 * half of a ``long time'', almost a long time, etc.)
92 * It is related to human patience and other factors which don't really
98 * A swapped in process is given a small amount of core without being bothered
99 * by the page replacement algorithm. Basically this says that if you are
100 * swapped in you deserve some resources. We protect the last SAFERSS
101 * pages against paging and will just swap you out rather than paging you.
102 * Note that each process has at least UPAGES pages which are not
103 * paged anyways, in addition to SAFERSS.
105 #define SAFERSS 10 /* nominal ``small'' resident set size
106 protected against replacement */
109 * We need region 7 virtual addresses for pagetables.
111 #define UMA_MD_SMALL_ALLOC
114 * The physical address space is sparsely populated.
116 #define VM_PHYSSEG_SPARSE
119 * The number of PHYSSEG entries is equal to the number of phys_avail
122 #define VM_PHYSSEG_MAX 49
125 * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
126 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
127 * the pool from which physical pages for small UMA objects are
130 #define VM_NFREEPOOL 3
131 #define VM_FREEPOOL_CACHE 2
132 #define VM_FREEPOOL_DEFAULT 0
133 #define VM_FREEPOOL_DIRECT 1
136 * Create one free page list.
138 #define VM_NFREELIST 1
139 #define VM_FREELIST_DEFAULT 0
142 * An allocation size of 256MB is supported in order to optimize the
143 * use of the identity mappings in region 7 by UMA.
145 #define VM_NFREEORDER 16
148 * Disable superpage reservations.
150 #ifndef VM_NRESERVLEVEL
151 #define VM_NRESERVLEVEL 0
155 * Manipulating region bits of an address.
157 #define IA64_RR_BASE(n) (((u_int64_t) (n)) << 61)
158 #define IA64_RR_MASK(x) ((x) & ((1L << 61) - 1))
160 #define IA64_PHYS_TO_RR6(x) ((x) | IA64_RR_BASE(6))
161 #define IA64_PHYS_TO_RR7(x) ((x) | IA64_RR_BASE(7))
164 * Page size of the identity mappings in region 7.
166 #ifndef LOG2_ID_PAGE_SIZE
167 #define LOG2_ID_PAGE_SIZE 28 /* 256M */
170 #define IA64_ID_PAGE_SHIFT (LOG2_ID_PAGE_SIZE)
171 #define IA64_ID_PAGE_SIZE (1<<(LOG2_ID_PAGE_SIZE))
172 #define IA64_ID_PAGE_MASK (IA64_ID_PAGE_SIZE-1)
174 #define IA64_BACKINGSTORE IA64_RR_BASE(4)
177 * Mach derived constants
180 /* user/kernel map constants */
181 #define VM_MIN_ADDRESS 0
182 #define VM_MAX_ADDRESS IA64_RR_BASE(5)
183 #define VM_GATEWAY_SIZE PAGE_SIZE
184 #define VM_MAXUSER_ADDRESS (VM_MAX_ADDRESS + VM_GATEWAY_SIZE)
185 #define VM_MIN_KERNEL_ADDRESS VM_MAXUSER_ADDRESS
186 #define VM_MAX_KERNEL_ADDRESS (IA64_RR_BASE(6) - 1)
188 #define KERNBASE VM_MAX_ADDRESS
190 /* virtual sizes (bytes) for various kernel submaps */
192 #define VM_KMEM_SIZE (12 * 1024 * 1024)
196 * How many physical pages per KVA page allocated.
197 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
198 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
199 * is the total KVA space allocated for kmem_map.
201 #ifndef VM_KMEM_SIZE_SCALE
202 #define VM_KMEM_SIZE_SCALE (4) /* XXX 8192 byte pages */
205 /* initial pagein size of beginning of executable file */
206 #ifndef VM_INITIAL_PAGEIN
207 #define VM_INITIAL_PAGEIN 16
210 #endif /* !_MACHINE_VMPARAM_H */