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.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 (32768UL*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 * We provide a machine specific single page allocator through the use
74 * of the direct mapped segment. This uses 2MB pages for reduced
77 #define UMA_MD_SMALL_ALLOC
80 * The physical address space is densely populated.
82 #define VM_PHYSSEG_DENSE
85 * The number of PHYSSEG entries must be one greater than the number
86 * of phys_avail entries because the phys_avail entry that spans the
87 * largest physical address that is accessible by ISA DMA is split
88 * into two PHYSSEG entries.
90 #define VM_PHYSSEG_MAX 31
93 * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
94 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
95 * the pool from which physical pages for page tables and small UMA
96 * objects are allocated.
98 #define VM_NFREEPOOL 3
99 #define VM_FREEPOOL_CACHE 2
100 #define VM_FREEPOOL_DEFAULT 0
101 #define VM_FREEPOOL_DIRECT 1
104 * Create two free page lists: VM_FREELIST_DEFAULT is for physical
105 * pages that are above the largest physical address that is
106 * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
107 * that are below that address.
109 #define VM_NFREELIST 2
110 #define VM_FREELIST_DEFAULT 0
111 #define VM_FREELIST_ISADMA 1
114 * An allocation size of 16MB is supported in order to optimize the
115 * use of the direct map by UMA. Specifically, a cache line contains
116 * at most 8 PDEs, collectively mapping 16MB of physical memory. By
117 * reducing the number of distinct 16MB "pages" that are used by UMA,
118 * the physical memory allocator reduces the likelihood of both 2MB
119 * page TLB misses and cache misses caused by 2MB page TLB misses.
121 #define VM_NFREEORDER 13
124 * Enable superpage reservations: 1 level.
126 #ifndef VM_NRESERVLEVEL
127 #define VM_NRESERVLEVEL 1
131 * Level 0 reservations consist of 512 pages.
133 #ifndef VM_LEVEL_0_ORDER
134 #define VM_LEVEL_0_ORDER 9
138 #define PA_LOCK_COUNT 256
142 * Virtual addresses of things. Derived from the page directory and
143 * page table indexes from pmap.h for precision.
145 * 0x0000000000000000 - 0x00007fffffffffff user map
146 * 0x0000800000000000 - 0xffff7fffffffffff does not exist (hole)
147 * 0xffff800000000000 - 0xffff804020100fff recursive page table (512GB slot)
148 * 0xffff804020101000 - 0xfffff7ffffffffff unused
149 * 0xfffff80000000000 - 0xfffffbffffffffff 4TB direct map
150 * 0xfffffc0000000000 - 0xfffffdffffffffff unused
151 * 0xfffffe0000000000 - 0xffffffffffffffff 2TB kernel map
153 * Within the kernel map:
155 * 0xffffffff80000000 KERNBASE
158 #define VM_MIN_KERNEL_ADDRESS KVADDR(KPML4BASE, 0, 0, 0)
159 #define VM_MAX_KERNEL_ADDRESS KVADDR(KPML4BASE + NKPML4E - 1, \
160 NPDPEPG-1, NPDEPG-1, NPTEPG-1)
162 #define DMAP_MIN_ADDRESS KVADDR(DMPML4I, 0, 0, 0)
163 #define DMAP_MAX_ADDRESS KVADDR(DMPML4I + NDMPML4E, 0, 0, 0)
165 #define KERNBASE KVADDR(KPML4I, KPDPI, 0, 0)
167 #define UPT_MAX_ADDRESS KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
168 #define UPT_MIN_ADDRESS KVADDR(PML4PML4I, 0, 0, 0)
170 #define VM_MAXUSER_ADDRESS UVADDR(NUPML4E, 0, 0, 0)
172 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
173 #define USRSTACK SHAREDPAGE
175 #define VM_MAX_ADDRESS UPT_MAX_ADDRESS
176 #define VM_MIN_ADDRESS (0)
178 #define PHYS_TO_DMAP(x) ((x) | DMAP_MIN_ADDRESS)
179 #define DMAP_TO_PHYS(x) ((x) & ~DMAP_MIN_ADDRESS)
181 /* virtual sizes (bytes) for various kernel submaps */
183 #define VM_KMEM_SIZE (12 * 1024 * 1024)
187 * How many physical pages per KVA page allocated.
188 * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
189 * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
190 * is the total KVA space allocated for kmem_map.
192 #ifndef VM_KMEM_SIZE_SCALE
193 #define VM_KMEM_SIZE_SCALE (1)
197 * Ceiling on amount of kmem_map kva space.
199 #ifndef VM_KMEM_SIZE_MAX
200 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
201 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
204 /* initial pagein size of beginning of executable file */
205 #ifndef VM_INITIAL_PAGEIN
206 #define VM_INITIAL_PAGEIN 16
209 #define ZERO_REGION_SIZE (2 * 1024 * 1024) /* 2MB */
211 #endif /* _MACHINE_VMPARAM_H_ */