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 * 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
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
39 #ifndef _MACHINE_VMPARAM_H_
40 #define _MACHINE_VMPARAM_H_ 1
43 * Machine dependent constants for 386.
47 * Virtual memory related constants, all in bytes
49 #define MAXTSIZ (128UL*1024*1024) /* max text size */
51 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
54 #define MAXDSIZ (512UL*1024*1024) /* max data size */
57 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
60 #define MAXSSIZ (64UL*1024*1024) /* max stack size */
63 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
67 * Choose between DENSE and SPARSE based on whether lower execution time or
68 * lower kernel address space consumption is desired. Under PAE, kernel
69 * address space is often in short supply.
72 #define VM_PHYSSEG_SPARSE
74 #define VM_PHYSSEG_DENSE
78 * The number of PHYSSEG entries must be one greater than the number
79 * of phys_avail entries because the phys_avail entry that spans the
80 * largest physical address that is accessible by ISA DMA is split
81 * into two PHYSSEG entries.
83 #define VM_PHYSSEG_MAX 17
86 * Create one free page pool. Since the i386 kernel virtual address
87 * space does not include a mapping onto the machine's entire physical
88 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
89 * pool, VM_FREEPOOL_DEFAULT.
91 #define VM_NFREEPOOL 1
92 #define VM_FREEPOOL_DEFAULT 0
93 #define VM_FREEPOOL_DIRECT 0
96 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
97 * pages that are above the largest physical address that is
98 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
99 * that are below that address.
101 #define VM_NFREELIST 2
102 #define VM_FREELIST_DEFAULT 0
103 #define VM_FREELIST_ISADMA 1
106 * The largest allocation size is 2MB under PAE and 4MB otherwise.
109 #define VM_NFREEORDER 10
111 #define VM_NFREEORDER 11
115 * Enable superpage reservations: 1 level.
117 #ifndef VM_NRESERVLEVEL
118 #define VM_NRESERVLEVEL 1
122 * Level 0 reservations consist of 512 pages when PAE pagetables are
123 * used, and 1024 pages otherwise.
125 #ifndef VM_LEVEL_0_ORDER
126 #if defined(PAE) || defined(PAE_TABLES)
127 #define VM_LEVEL_0_ORDER 9
129 #define VM_LEVEL_0_ORDER 10
134 * Kernel physical load address.
137 #define KERNLOAD (1 << PDRSHIFT)
138 #endif /* !defined(KERNLOAD) */
141 * Virtual addresses of things. Derived from the page directory and
142 * page table indexes from pmap.h for precision.
143 * Because of the page that is both a PD and PT, it looks a little
144 * messy at times, but hey, we'll do anything to save a page :-)
147 #define VM_MAX_KERNEL_ADDRESS VADDR(KPTDI+NKPDE-1, NPTEPG-1)
149 #define VM_MIN_KERNEL_ADDRESS VADDR(PTDPTDI, PTDPTDI)
151 #define KERNBASE VADDR(KPTDI, 0)
153 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
154 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
156 #define VM_MAXUSER_ADDRESS VADDR(PTDPTDI, 0)
158 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
159 #define USRSTACK SHAREDPAGE
161 #define VM_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
162 #define VM_MIN_ADDRESS ((vm_offset_t)0)
165 * How many physical pages per kmem arena virtual page.
167 #ifndef VM_KMEM_SIZE_SCALE
168 #define VM_KMEM_SIZE_SCALE (3)
172 * Optional floor (in bytes) on the size of the kmem arena.
174 #ifndef VM_KMEM_SIZE_MIN
175 #define VM_KMEM_SIZE_MIN (12 * 1024 * 1024)
179 * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
180 * kernel map rounded to the nearest multiple of the superpage size.
182 #ifndef VM_KMEM_SIZE_MAX
183 #define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \
184 VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT)
187 /* initial pagein size of beginning of executable file */
188 #ifndef VM_INITIAL_PAGEIN
189 #define VM_INITIAL_PAGEIN 16
192 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
194 #ifndef VM_MAX_AUTOTUNE_MAXUSERS
195 #define VM_MAX_AUTOTUNE_MAXUSERS 384
201 #define SFBUF_PROCESS_PAGE
203 #endif /* _MACHINE_VMPARAM_H_ */