xref: /freebsd/sys/i386/include/vmparam.h (revision 6472ac3d8a86336899b6cfb789a4cd9897e3fab5)
1 /*-
2  * Copyright (c) 1990 The Regents of the University of California.
3  * All rights reserved.
4  * Copyright (c) 1994 John S. Dyson
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to Berkeley by
8  * William Jolitz.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
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.
21  *
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
32  * SUCH DAMAGE.
33  *
34  *	from: @(#)vmparam.h	5.9 (Berkeley) 5/12/91
35  * $FreeBSD$
36  */
37 
38 
39 #ifndef _MACHINE_VMPARAM_H_
40 #define _MACHINE_VMPARAM_H_ 1
41 
42 /*
43  * Machine dependent constants for 386.
44  */
45 
46 /*
47  * Virtual memory related constants, all in bytes
48  */
49 #define	MAXTSIZ		(128UL*1024*1024)	/* max text size */
50 #ifndef DFLDSIZ
51 #define	DFLDSIZ		(128UL*1024*1024)	/* initial data size limit */
52 #endif
53 #ifndef MAXDSIZ
54 #define	MAXDSIZ		(512UL*1024*1024)	/* max data size */
55 #endif
56 #ifndef	DFLSSIZ
57 #define	DFLSSIZ		(8UL*1024*1024)		/* initial stack size limit */
58 #endif
59 #ifndef	MAXSSIZ
60 #define	MAXSSIZ		(64UL*1024*1024)	/* max stack size */
61 #endif
62 #ifndef SGROWSIZ
63 #define SGROWSIZ	(128UL*1024)		/* amount to grow stack */
64 #endif
65 
66 /*
67  * The physical address space is densely populated.
68  */
69 #define	VM_PHYSSEG_DENSE
70 
71 /*
72  * The number of PHYSSEG entries must be one greater than the number
73  * of phys_avail entries because the phys_avail entry that spans the
74  * largest physical address that is accessible by ISA DMA is split
75  * into two PHYSSEG entries.
76  */
77 #define	VM_PHYSSEG_MAX		17
78 
79 /*
80  * Create two free page pools.  Since the i386 kernel virtual address
81  * space does not include a mapping onto the machine's entire physical
82  * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
83  * pool, VM_FREEPOOL_DEFAULT.
84  */
85 #define	VM_NFREEPOOL		2
86 #define	VM_FREEPOOL_CACHE	1
87 #define	VM_FREEPOOL_DEFAULT	0
88 #define	VM_FREEPOOL_DIRECT	0
89 
90 /*
91  * Create two free page lists: VM_FREELIST_DEFAULT is for physical
92  * pages that are above the largest physical address that is
93  * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
94  * that are below that address.
95  */
96 #define	VM_NFREELIST		2
97 #define	VM_FREELIST_DEFAULT	0
98 #define	VM_FREELIST_ISADMA	1
99 
100 /*
101  * The largest allocation size is 2MB under PAE and 4MB otherwise.
102  */
103 #ifdef PAE
104 #define	VM_NFREEORDER		10
105 #else
106 #define	VM_NFREEORDER		11
107 #endif
108 
109 /*
110  * Only one memory domain.
111  */
112 #ifndef VM_NDOMAIN
113 #define	VM_NDOMAIN		1
114 #endif
115 
116 /*
117  * Enable superpage reservations: 1 level.
118  */
119 #ifndef	VM_NRESERVLEVEL
120 #define	VM_NRESERVLEVEL		1
121 #endif
122 
123 /*
124  * Level 0 reservations consist of 512 pages under PAE and 1024 pages
125  * otherwise.
126  */
127 #ifndef	VM_LEVEL_0_ORDER
128 #ifdef PAE
129 #define	VM_LEVEL_0_ORDER	9
130 #else
131 #define	VM_LEVEL_0_ORDER	10
132 #endif
133 #endif
134 
135 /*
136  * Kernel physical load address.
137  */
138 #ifndef KERNLOAD
139 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST)
140 #define	KERNLOAD		0
141 #else
142 #define	KERNLOAD		(1 << PDRSHIFT)
143 #endif
144 #endif /* !defined(KERNLOAD) */
145 
146 /*
147  * Virtual addresses of things.  Derived from the page directory and
148  * page table indexes from pmap.h for precision.
149  * Because of the page that is both a PD and PT, it looks a little
150  * messy at times, but hey, we'll do anything to save a page :-)
151  */
152 
153 #ifdef XEN
154 #define VM_MAX_KERNEL_ADDRESS	HYPERVISOR_VIRT_START
155 #else
156 #define VM_MAX_KERNEL_ADDRESS	VADDR(KPTDI+NKPDE-1, NPTEPG-1)
157 #endif
158 
159 #define VM_MIN_KERNEL_ADDRESS	VADDR(PTDPTDI, PTDPTDI)
160 
161 #define	KERNBASE		VADDR(KPTDI, 0)
162 
163 #define UPT_MAX_ADDRESS		VADDR(PTDPTDI, PTDPTDI)
164 #define UPT_MIN_ADDRESS		VADDR(PTDPTDI, 0)
165 
166 #define VM_MAXUSER_ADDRESS	VADDR(PTDPTDI, 0)
167 
168 #define USRSTACK		VM_MAXUSER_ADDRESS
169 
170 #define VM_MAX_ADDRESS		VADDR(PTDPTDI, PTDPTDI)
171 #define VM_MIN_ADDRESS		((vm_offset_t)0)
172 
173 /* virtual sizes (bytes) for various kernel submaps */
174 #ifndef VM_KMEM_SIZE
175 #define VM_KMEM_SIZE		(12 * 1024 * 1024)
176 #endif
177 
178 /*
179  * How many physical pages per KVA page allocated.
180  * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
181  *     VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
182  * is the total KVA space allocated for kmem_map.
183  */
184 #ifndef VM_KMEM_SIZE_SCALE
185 #define	VM_KMEM_SIZE_SCALE	(3)
186 #endif
187 
188 /*
189  * Ceiling on amount of kmem_map kva space.
190  */
191 #ifndef VM_KMEM_SIZE_MAX
192 #define	VM_KMEM_SIZE_MAX	((VM_MAX_KERNEL_ADDRESS - \
193     VM_MIN_KERNEL_ADDRESS) * 2 / 5)
194 #endif
195 
196 /* initial pagein size of beginning of executable file */
197 #ifndef VM_INITIAL_PAGEIN
198 #define	VM_INITIAL_PAGEIN	16
199 #endif
200 
201 #define	ZERO_REGION_SIZE	(64 * 1024)	/* 64KB */
202 
203 #endif /* _MACHINE_VMPARAM_H_ */
204