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.
17 * 2. Redistributions in binary form must reproduce the above copyright
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.
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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 * The physical address space is densely populated.
93 #define VM_PHYSSEG_DENSE
96 * The number of PHYSSEG entries must be one greater than the number
97 * of phys_avail entries because the phys_avail entry that spans the
98 * largest physical address that is accessible by ISA DMA is split
99 * into two PHYSSEG entries.
101 #define VM_PHYSSEG_MAX 31
104 * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
105 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
106 * the pool from which physical pages for page tables and small UMA
107 * objects are allocated.
109 #define VM_NFREEPOOL 3
110 #define VM_FREEPOOL_CACHE 2
111 #define VM_FREEPOOL_DEFAULT 0
112 #define VM_FREEPOOL_DIRECT 1
115 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
116 * pages that are above the largest physical address that is
117 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
118 * that are below that address.
120 #define VM_NFREELIST 2
121 #define VM_FREELIST_DEFAULT 0
122 #define VM_FREELIST_ISADMA 1
125 * An allocation size of 16MB is supported in order to optimize the
126 * use of the direct map by UMA. Specifically, a cache line contains
127 * at most 8 PDEs, collectively mapping 16MB of physical memory. By
128 * reducing the number of distinct 16MB "pages" that are used by UMA,
129 * the physical memory allocator reduces the likelihood of both 2MB
130 * page TLB misses and cache misses caused by 2MB page TLB misses.
132 #define VM_NFREEORDER 13
135 * Enable superpage reservations: 1 level.
137 #ifndef VM_NRESERVLEVEL
138 #define VM_NRESERVLEVEL 1
142 * Level 0 reservations consist of 512 pages.
144 #ifndef VM_LEVEL_0_ORDER
145 #define VM_LEVEL_0_ORDER 9
149 * Virtual addresses of things. Derived from the page directory and
150 * page table indexes from pmap.h for precision.
152 * 0x0000000000000000 - 0x00007fffffffffff user map
153 * 0x0000800000000000 - 0xffff7fffffffffff does not exist (hole)
154 * 0xffff800000000000 - 0xffff804020100fff recursive page table (512GB slot)
155 * 0xffff804020101000 - 0xfffffeffffffffff unused
156 * 0xffffff0000000000 - 0xffffff7fffffffff 512GB direct map mappings
157 * 0xffffff8000000000 - 0xffffffffffffffff 512GB kernel map
159 * Within the kernel map:
161 * 0xffffffff80000000 KERNBASE
164 #define VM_MAX_KERNEL_ADDRESS KVADDR(KPML4I, NPDPEPG-1, NPDEPG-1, NPTEPG-1)
165 #define VM_MIN_KERNEL_ADDRESS KVADDR(KPML4I, NPDPEPG-512, 0, 0)
167 #define DMAP_MIN_ADDRESS KVADDR(DMPML4I, 0, 0, 0)
168 #define DMAP_MAX_ADDRESS KVADDR(DMPML4I+1, 0, 0, 0)
170 #define KERNBASE KVADDR(KPML4I, KPDPI, 0, 0)
172 #define UPT_MAX_ADDRESS KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
173 #define UPT_MIN_ADDRESS KVADDR(PML4PML4I, 0, 0, 0)
175 #define VM_MAXUSER_ADDRESS UVADDR(NUPML4E, 0, 0, 0)
177 #define USRSTACK VM_MAXUSER_ADDRESS
179 #define VM_MAX_ADDRESS UPT_MAX_ADDRESS
180 #define VM_MIN_ADDRESS (0)
182 #define PHYS_TO_DMAP(x) ((x) | DMAP_MIN_ADDRESS)
183 #define DMAP_TO_PHYS(x) ((x) & ~DMAP_MIN_ADDRESS)
185 /* virtual sizes (bytes) for various kernel submaps */
187 #define VM_KMEM_SIZE (12 * 1024 * 1024)
191 * How many physical pages per KVA page allocated.
192 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
193 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
194 * is the total KVA space allocated for kmem_map.
196 #ifndef VM_KMEM_SIZE_SCALE
197 #define VM_KMEM_SIZE_SCALE (1)
201 * Ceiling on amount of kmem_map kva space.
203 #ifndef VM_KMEM_SIZE_MAX
204 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
205 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
208 /* initial pagein size of beginning of executable file */
209 #ifndef VM_INITIAL_PAGEIN
210 #define VM_INITIAL_PAGEIN 16
213 #endif /* _MACHINE_VMPARAM_H_ */