2 * Copyright (c) 1990 The Regents of the University of California.
4 * Copyright (c) 1994 John S. Dyson
6 * Copyright (c) 2003 Peter Wemm
9 * This code is derived from software contributed to Berkeley by
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
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18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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40 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
45 #ifndef _MACHINE_VMPARAM_H_
46 #define _MACHINE_VMPARAM_H_ 1
49 * Machine dependent constants for AMD64.
53 * Virtual memory related constants, all in bytes
55 #define MAXTSIZ (128UL*1024*1024) /* max text size */
57 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
60 #define MAXDSIZ (32768UL*1024*1024) /* max data size */
63 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
66 #define MAXSSIZ (512UL*1024*1024) /* max stack size */
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 provide a machine specific single page allocator through the use
85 * of the direct mapped segment. This uses 2MB pages for reduced
88 #define UMA_MD_SMALL_ALLOC
91 * Virtual addresses of things. Derived from the page directory and
92 * page table indexes from pmap.h for precision.
94 * 0x0000000000000000 - 0x00007fffffffffff user map
95 * 0x0000800000000000 - 0xffff7fffffffffff does not exist (hole)
96 * 0xffff800000000000 - 0xffff804020100fff recursive page table (512GB slot)
97 * 0xffff804020101000 - 0xfffffeffffffffff unused
98 * 0xffffff0000000000 - 0xffffff7fffffffff 512GB direct map mappings
99 * 0xffffff8000000000 - 0xffffffff7fffffff unused (510GB)
100 * 0xffffffff80000000 - 0xffffffffffffffff 2GB kernel map
102 * Within the kernel map:
103 * 0xffffffff80000000 KERNBASE
106 #define VM_MAX_KERNEL_ADDRESS KVADDR(KPML4I, NPDPEPG-1, NKPDE-1, NPTEPG-1)
107 #define VM_MIN_KERNEL_ADDRESS KVADDR(KPML4I, KPDPI, 0, 0)
109 #define DMAP_MIN_ADDRESS KVADDR(DMPML4I, 0, 0, 0)
110 #define DMAP_MAX_ADDRESS KVADDR(DMPML4I+1, 0, 0, 0)
112 #define KERNBASE KVADDR(KPML4I, KPDPI, 0, 0)
114 #define UPT_MAX_ADDRESS KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
115 #define UPT_MIN_ADDRESS KVADDR(PML4PML4I, 0, 0, 0)
117 #define VM_MAXUSER_ADDRESS UVADDR(NUPML4E, 0, 0, 0)
119 #define USRSTACK VM_MAXUSER_ADDRESS
121 #define VM_MAX_ADDRESS UPT_MAX_ADDRESS
122 #define VM_MIN_ADDRESS (0)
124 #define PHYS_TO_DMAP(x) ((x) | DMAP_MIN_ADDRESS)
125 #define DMAP_TO_PHYS(x) ((x) & ~DMAP_MIN_ADDRESS)
127 /* virtual sizes (bytes) for various kernel submaps */
129 #define VM_KMEM_SIZE (12 * 1024 * 1024)
133 * How many physical pages per KVA page allocated.
134 * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
135 * is the total KVA space allocated for kmem_map.
137 #ifndef VM_KMEM_SIZE_SCALE
138 #define VM_KMEM_SIZE_SCALE (3)
142 * Ceiling on amount of kmem_map kva space.
144 #ifndef VM_KMEM_SIZE_MAX
145 #define VM_KMEM_SIZE_MAX (400 * 1024 * 1024)
148 /* initial pagein size of beginning of executable file */
149 #ifndef VM_INITIAL_PAGEIN
150 #define VM_INITIAL_PAGEIN 16
153 #endif /* _MACHINE_VMPARAM_H_ */