2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright (c) 1990 The Regents of the University of California.
6 * Copyright (c) 1994 John S. Dyson
8 * Copyright (c) 2003 Peter Wemm
11 * This code is derived from software contributed to Berkeley by
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15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
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23 * must display the following acknowledgement:
24 * This product includes software developed by the University of
25 * California, Berkeley and its contributors.
26 * 4. Neither the name of the University nor the names of its contributors
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30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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42 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
46 #ifndef _MACHINE_VMPARAM_H_
47 #define _MACHINE_VMPARAM_H_ 1
50 * Machine dependent constants for AMD64.
54 * Virtual memory related constants, all in bytes
56 #define MAXTSIZ (32768UL*1024*1024) /* max text size */
58 #define DFLDSIZ (32768UL*1024*1024) /* initial data size limit */
61 #define MAXDSIZ (32768UL*1024*1024) /* max data size */
64 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
67 #define MAXSSIZ (512UL*1024*1024) /* max stack size */
70 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
74 * We provide a machine specific single page allocator through the use
75 * of the direct mapped segment. This uses 2MB pages for reduced
78 #define UMA_MD_SMALL_ALLOC
81 * The physical address space is densely populated.
83 #define VM_PHYSSEG_DENSE
86 * The number of PHYSSEG entries must be one greater than the number
87 * of phys_avail entries because the phys_avail entry that spans the
88 * largest physical address that is accessible by ISA DMA is split
89 * into two PHYSSEG entries.
91 #define VM_PHYSSEG_MAX 63
94 * Create two free page pools: VM_FREEPOOL_DEFAULT is the default pool
95 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
96 * the pool from which physical pages for page tables and small UMA
97 * objects are allocated.
99 #define VM_NFREEPOOL 2
100 #define VM_FREEPOOL_DEFAULT 0
101 #define VM_FREEPOOL_DIRECT 1
104 * Create up to three free page lists: VM_FREELIST_DMA32 is for physical pages
105 * that have physical addresses below 4G but are not accessible by ISA DMA,
106 * and VM_FREELIST_ISADMA is for physical pages that are accessible by ISA
109 #define VM_NFREELIST 3
110 #define VM_FREELIST_DEFAULT 0
111 #define VM_FREELIST_DMA32 1
112 #define VM_FREELIST_LOWMEM 2
114 #define VM_LOWMEM_BOUNDARY (16 << 20) /* 16MB ISA DMA limit */
117 * Create the DMA32 free list only if the number of physical pages above
118 * physical address 4G is at least 16M, which amounts to 64GB of physical
121 #define VM_DMA32_NPAGES_THRESHOLD 16777216
124 * An allocation size of 16MB is supported in order to optimize the
125 * use of the direct map by UMA. Specifically, a cache line contains
126 * at most 8 PDEs, collectively mapping 16MB of physical memory. By
127 * reducing the number of distinct 16MB "pages" that are used by UMA,
128 * the physical memory allocator reduces the likelihood of both 2MB
129 * page TLB misses and cache misses caused by 2MB page TLB misses.
131 #define VM_NFREEORDER 13
134 * Enable superpage reservations: 1 level.
136 #ifndef VM_NRESERVLEVEL
137 #define VM_NRESERVLEVEL 1
141 * Level 0 reservations consist of 512 pages.
143 #ifndef VM_LEVEL_0_ORDER
144 #define VM_LEVEL_0_ORDER 9
148 #define PA_LOCK_COUNT 256
152 * Virtual addresses of things. Derived from the page directory and
153 * page table indexes from pmap.h for precision.
155 * 0x0000000000000000 - 0x00007fffffffffff user map
156 * 0x0000800000000000 - 0xffff7fffffffffff does not exist (hole)
157 * 0xffff800000000000 - 0xffff804020100fff recursive page table (512GB slot)
158 * 0xffff804020100fff - 0xffff807fffffffff unused
159 * 0xffff808000000000 - 0xffff847fffffffff large map (can be tuned up)
160 * 0xffff848000000000 - 0xfffff7ffffffffff unused (large map extends there)
161 * 0xfffff80000000000 - 0xfffffbffffffffff 4TB direct map
162 * 0xfffffc0000000000 - 0xfffffdffffffffff unused
163 * 0xfffffe0000000000 - 0xffffffffffffffff 2TB kernel map
165 * Within the kernel map:
167 * 0xfffffe0000000000 vm_page_array
168 * 0xffffffff80000000 KERNBASE
171 #define VM_MIN_KERNEL_ADDRESS KV4ADDR(KPML4BASE, 0, 0, 0)
172 #define VM_MAX_KERNEL_ADDRESS KV4ADDR(KPML4BASE + NKPML4E - 1, \
173 NPDPEPG-1, NPDEPG-1, NPTEPG-1)
175 #define DMAP_MIN_ADDRESS KV4ADDR(DMPML4I, 0, 0, 0)
176 #define DMAP_MAX_ADDRESS KV4ADDR(DMPML4I + NDMPML4E, 0, 0, 0)
178 #define LARGEMAP_MIN_ADDRESS KV4ADDR(LMSPML4I, 0, 0, 0)
179 #define LARGEMAP_MAX_ADDRESS KV4ADDR(LMEPML4I + 1, 0, 0, 0)
181 #define KERNBASE KV4ADDR(KPML4I, KPDPI, 0, 0)
183 #define UPT_MAX_ADDRESS KV4ADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
184 #define UPT_MIN_ADDRESS KV4ADDR(PML4PML4I, 0, 0, 0)
186 #define VM_MAXUSER_ADDRESS_LA57 UVADDR(NUPML5E, 0, 0, 0, 0)
187 #define VM_MAXUSER_ADDRESS_LA48 UVADDR(0, NUP4ML4E, 0, 0, 0)
188 #define VM_MAXUSER_ADDRESS VM_MAXUSER_ADDRESS_LA57
190 #define SHAREDPAGE_LA57 (VM_MAXUSER_ADDRESS_LA57 - PAGE_SIZE)
191 #define SHAREDPAGE_LA48 (VM_MAXUSER_ADDRESS_LA48 - PAGE_SIZE)
192 #define USRSTACK_LA57 SHAREDPAGE_LA57
193 #define USRSTACK_LA48 SHAREDPAGE_LA48
194 #define USRSTACK USRSTACK_LA48
195 #define PS_STRINGS_LA57 (USRSTACK_LA57 - sizeof(struct ps_strings))
196 #define PS_STRINGS_LA48 (USRSTACK_LA48 - sizeof(struct ps_strings))
198 #define VM_MAX_ADDRESS UPT_MAX_ADDRESS
199 #define VM_MIN_ADDRESS (0)
202 * XXX Allowing dmaplimit == 0 is a temporary workaround for vt(4) efifb's
203 * early use of PHYS_TO_DMAP before the mapping is actually setup. This works
204 * because the result is not actually accessed until later, but the early
205 * vt fb startup needs to be reworked.
207 #define PMAP_HAS_DMAP 1
208 #define PHYS_TO_DMAP(x) ({ \
209 KASSERT(dmaplimit == 0 || (x) < dmaplimit, \
210 ("physical address %#jx not covered by the DMAP", \
212 (x) | DMAP_MIN_ADDRESS; })
214 #define DMAP_TO_PHYS(x) ({ \
215 KASSERT((x) < (DMAP_MIN_ADDRESS + dmaplimit) && \
216 (x) >= DMAP_MIN_ADDRESS, \
217 ("virtual address %#jx not covered by the DMAP", \
219 (x) & ~DMAP_MIN_ADDRESS; })
222 * amd64 maps the page array into KVA so that it can be more easily
223 * allocated on the correct memory domains.
225 #define PMAP_HAS_PAGE_ARRAY 1
228 * How many physical pages per kmem arena virtual page.
230 #ifndef VM_KMEM_SIZE_SCALE
231 #define VM_KMEM_SIZE_SCALE (1)
235 * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
238 #ifndef VM_KMEM_SIZE_MAX
239 #define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
240 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
243 /* initial pagein size of beginning of executable file */
244 #ifndef VM_INITIAL_PAGEIN
245 #define VM_INITIAL_PAGEIN 16
248 #define ZERO_REGION_SIZE (2 * 1024 * 1024) /* 2MB */
251 * Use a fairly large batch size since we expect amd64 systems to have lots of
254 #define VM_BATCHQUEUE_SIZE 31
257 * Need a page dump array for minidump.
259 #define MINIDUMP_PAGE_TRACKING 1
261 #endif /* _MACHINE_VMPARAM_H_ */