1 /* $OpenBSD: vmparam.h,v 1.2 1998/09/15 10:50:12 pefo Exp $ */
2 /* $NetBSD: vmparam.h,v 1.5 1994/10/26 21:10:10 cgd Exp $ */
5 * Copyright (c) 1988 University of Utah.
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
9 * This code is derived from software contributed to Berkeley by
10 * the Systems Programming Group of the University of Utah Computer
11 * Science Department and Ralph Campbell.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * from: Utah Hdr: vmparam.h 1.16 91/01/18
38 * @(#)vmparam.h 8.2 (Berkeley) 4/22/94
39 * JNPR: vmparam.h,v 1.3.2.1 2007/09/10 06:01:28 girish
43 #ifndef _MACHINE_VMPARAM_H_
44 #define _MACHINE_VMPARAM_H_
47 * Machine dependent constants mips processors.
50 * USRTEXT is the start of the user text/data space, while USRSTACK
51 * is the top (end) of the user stack.
53 #define USRTEXT (1*PAGE_SIZE)
56 * Virtual memory related constants, all in bytes
59 #define MAXTSIZ (128UL*1024*1024) /* max text size */
62 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
65 #define MAXDSIZ (1*1024UL*1024*1024) /* max data size */
68 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
71 #define MAXSSIZ (64UL*1024*1024) /* max stack size */
74 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
78 * The time for a process to be blocked before being very swappable.
79 * This is a number of seconds which the system takes as being a non-trivial
80 * amount of real time. You probably shouldn't change this;
81 * it is used in subtle ways (fractions and multiples of it are, that is, like
82 * half of a ``long time'', almost a long time, etc.)
83 * It is related to human patience and other factors which don't really
89 * Mach derived constants
92 /* user/kernel map constants */
93 #define VM_MIN_ADDRESS ((vm_offset_t)0x00000000)
94 #define VM_MAX_ADDRESS ((vm_offset_t)(intptr_t)(int32_t)0xffffffff)
96 #define VM_MINUSER_ADDRESS ((vm_offset_t)0x00000000)
97 #define VM_MAX_MMAP_ADDR VM_MAXUSER_ADDRESS
100 #define VM_MAXUSER_ADDRESS (VM_MINUSER_ADDRESS + (NPDEPG * NBSEG))
101 #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0xc000000000000000)
102 #define VM_MAX_KERNEL_ADDRESS (VM_MIN_KERNEL_ADDRESS + (NPDEPG * NBSEG))
104 #define VM_MAXUSER_ADDRESS ((vm_offset_t)0x80000000)
105 #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0xC0000000)
106 #define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xFFFFC000)
109 #define KERNBASE ((vm_offset_t)(intptr_t)(int32_t)0x80000000)
111 * USRSTACK needs to start a little below 0x8000000 because the R8000
112 * and some QED CPUs perform some virtual address checks before the
113 * offset is calculated.
115 #define USRSTACK (VM_MAXUSER_ADDRESS - PAGE_SIZE)
118 * Only one memory domain.
125 * Disable superpage reservations. (not sure if this is right
126 * I copied it from ARM)
128 #ifndef VM_NRESERVLEVEL
129 #define VM_NRESERVLEVEL 0
132 /* virtual sizes (bytes) for various kernel submaps */
134 #define VM_KMEM_SIZE (12 * 1024 * 1024)
138 * How many physical pages per KVA page allocated.
139 * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
140 * is the total KVA space allocated for kmem_map.
142 #ifndef VM_KMEM_SIZE_SCALE
143 #define VM_KMEM_SIZE_SCALE (3)
147 * Ceiling on amount of kmem_map kva space.
149 #ifndef VM_KMEM_SIZE_MAX
150 #define VM_KMEM_SIZE_MAX (200 * 1024 * 1024)
153 /* initial pagein size of beginning of executable file */
154 #ifndef VM_INITIAL_PAGEIN
155 #define VM_INITIAL_PAGEIN 16
159 * max number of non-contig chunks of physical RAM you can have
161 #define VM_PHYSSEG_MAX 32
164 * The physical address space is sparsely populated.
166 #define VM_PHYSSEG_SPARSE
169 * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
170 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
171 * the pool from which physical pages for small UMA objects are
174 #define VM_NFREEPOOL 3
175 #define VM_FREEPOOL_CACHE 2
176 #define VM_FREEPOOL_DEFAULT 0
177 #define VM_FREEPOOL_DIRECT 1
180 * we support 2 free lists:
182 * - DEFAULT for direct mapped (KSEG0) pages.
183 * Note: This usage of DEFAULT may be misleading because we use
184 * DEFAULT for allocating direct mapped pages. The normal page
185 * allocations use HIGHMEM if available, and then DEFAULT.
186 * - HIGHMEM for other pages
189 #define VM_NFREELIST 1
190 #define VM_FREELIST_DEFAULT 0
191 #define VM_FREELIST_DIRECT VM_FREELIST_DEFAULT
193 #define VM_NFREELIST 2
194 #define VM_FREELIST_DEFAULT 1
195 #define VM_FREELIST_HIGHMEM 0
196 #define VM_FREELIST_DIRECT VM_FREELIST_DEFAULT
197 #define VM_HIGHMEM_ADDRESS ((vm_paddr_t)0x20000000)
201 * The largest allocation size is 1MB.
203 #define VM_NFREEORDER 9
205 #endif /* !_MACHINE_VMPARAM_H_ */