master
1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 * Copyright (c) 1994 John S. Dyson
7 * All rights reserved.
8 * Copyright (c) 2003 Peter Wemm
9 * All rights reserved.
10 *
11 * This code is derived from software contributed to Berkeley by
12 * William Jolitz.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. All advertising materials mentioning features or use of this software
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
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 *
42 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
43 */
44
45#ifdef __i386__
46#include <i386/vmparam.h>
47#else /* !__i386__ */
48
49#ifndef _MACHINE_VMPARAM_H_
50#define _MACHINE_VMPARAM_H_ 1
51
52/*
53 * Machine dependent constants for AMD64.
54 */
55
56/*
57 * Virtual memory related constants, all in bytes
58 */
59#define MAXTSIZ (32768UL*1024*1024) /* max text size */
60#ifndef DFLDSIZ
61#define DFLDSIZ (32768UL*1024*1024) /* initial data size limit */
62#endif
63#ifndef MAXDSIZ
64#define MAXDSIZ (32768UL*1024*1024) /* max data size */
65#endif
66#ifndef DFLSSIZ
67#define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
68#endif
69#ifndef MAXSSIZ
70#define MAXSSIZ (512UL*1024*1024) /* max stack size */
71#endif
72#ifndef SGROWSIZ
73#define SGROWSIZ (128UL*1024) /* amount to grow stack */
74#endif
75
76/*
77 * We provide a machine specific single page allocator through the use
78 * of the direct mapped segment. This uses 2MB pages for reduced
79 * TLB pressure.
80 */
81#if !defined(KASAN) && !defined(KMSAN)
82#define UMA_MD_SMALL_ALLOC
83#endif
84
85/*
86 * The physical address space is densely populated.
87 */
88#define VM_PHYSSEG_DENSE
89
90/*
91 * The number of PHYSSEG entries must be one greater than the number
92 * of phys_avail entries because the phys_avail entry that spans the
93 * largest physical address that is accessible by ISA DMA is split
94 * into two PHYSSEG entries.
95 */
96#define VM_PHYSSEG_MAX 63
97
98/*
99 * Create two free page pools: VM_FREEPOOL_DEFAULT is the default pool
100 * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
101 * the pool from which physical pages for page tables and small UMA
102 * objects are allocated.
103 */
104#define VM_NFREEPOOL 2
105#define VM_FREEPOOL_DEFAULT 0
106#define VM_FREEPOOL_DIRECT 1
107
108/*
109 * Create up to three free page lists: VM_FREELIST_DMA32 is for physical pages
110 * that have physical addresses below 4G but are not accessible by ISA DMA,
111 * and VM_FREELIST_ISADMA is for physical pages that are accessible by ISA
112 * DMA.
113 */
114#define VM_NFREELIST 3
115#define VM_FREELIST_DEFAULT 0
116#define VM_FREELIST_DMA32 1
117#define VM_FREELIST_LOWMEM 2
118
119#define VM_LOWMEM_BOUNDARY (16 << 20) /* 16MB ISA DMA limit */
120
121/*
122 * Create the DMA32 free list only if the number of physical pages above
123 * physical address 4G is at least 16M, which amounts to 64GB of physical
124 * memory.
125 */
126#define VM_DMA32_NPAGES_THRESHOLD 16777216
127
128/*
129 * An allocation size of 16MB is supported in order to optimize the
130 * use of the direct map by UMA. Specifically, a cache line contains
131 * at most 8 PDEs, collectively mapping 16MB of physical memory. By
132 * reducing the number of distinct 16MB "pages" that are used by UMA,
133 * the physical memory allocator reduces the likelihood of both 2MB
134 * page TLB misses and cache misses caused by 2MB page TLB misses.
135 */
136#define VM_NFREEORDER 13
137
138/*
139 * Enable superpage reservations: 1 level.
140 */
141#ifndef VM_NRESERVLEVEL
142#define VM_NRESERVLEVEL 1
143#endif
144
145/*
146 * Level 0 reservations consist of 512 pages.
147 */
148#ifndef VM_LEVEL_0_ORDER
149#define VM_LEVEL_0_ORDER 9
150#endif
151
152#ifdef SMP
153#define PA_LOCK_COUNT 256
154#endif
155
156/*
157 * Kernel physical load address for non-UEFI boot and for legacy UEFI loader.
158 * Newer UEFI loader loads kernel anywhere below 4G, with memory allocated
159 * by boot services.
160 * Needs to be aligned at 2MB superpage boundary.
161 */
162#ifndef KERNLOAD
163#define KERNLOAD 0x200000
164#endif
165
166/*
167 * Virtual addresses of things. Derived from the page directory and
168 * page table indexes from pmap.h for precision.
169 *
170 * 0x0000000000000000 - 0x00007fffffffffff user map
171 * 0x0000800000000000 - 0xffff7fffffffffff does not exist (hole)
172 * 0xffff800000000000 - 0xffff804020100fff recursive page table (512GB slot)
173 * 0xffff804020100fff - 0xffff807fffffffff unused
174 * 0xffff808000000000 - 0xffff847fffffffff large map (can be tuned up)
175 * 0xffff848000000000 - 0xfffff77fffffffff unused (large map extends there)
176 * 0xfffff60000000000 - 0xfffff7ffffffffff 2TB KMSAN origin map, optional
177 * 0xfffff78000000000 - 0xfffff7bfffffffff 512GB KASAN shadow map, optional
178 * 0xfffff80000000000 - 0xfffffbffffffffff 4TB direct map
179 * 0xfffffc0000000000 - 0xfffffdffffffffff 2TB KMSAN shadow map, optional
180 * 0xfffffe0000000000 - 0xffffffffffffffff 2TB kernel map
181 *
182 * Within the kernel map:
183 *
184 * 0xfffffe0000000000 vm_page_array
185 * 0xffffffff80000000 KERNBASE
186 */
187
188#define VM_MIN_KERNEL_ADDRESS KV4ADDR(KPML4BASE, 0, 0, 0)
189#define VM_MAX_KERNEL_ADDRESS KV4ADDR(KPML4BASE + NKPML4E - 1, \
190 NPDPEPG-1, NPDEPG-1, NPTEPG-1)
191
192#define DMAP_MIN_ADDRESS KV4ADDR(DMPML4I, 0, 0, 0)
193#define DMAP_MAX_ADDRESS KV4ADDR(DMPML4I + NDMPML4E, 0, 0, 0)
194
195#define KASAN_MIN_ADDRESS KV4ADDR(KASANPML4I, 0, 0, 0)
196#define KASAN_MAX_ADDRESS KV4ADDR(KASANPML4I + NKASANPML4E, 0, 0, 0)
197
198#define KMSAN_SHAD_MIN_ADDRESS KV4ADDR(KMSANSHADPML4I, 0, 0, 0)
199#define KMSAN_SHAD_MAX_ADDRESS KV4ADDR(KMSANSHADPML4I + NKMSANSHADPML4E, \
200 0, 0, 0)
201
202#define KMSAN_ORIG_MIN_ADDRESS KV4ADDR(KMSANORIGPML4I, 0, 0, 0)
203#define KMSAN_ORIG_MAX_ADDRESS KV4ADDR(KMSANORIGPML4I + NKMSANORIGPML4E, \
204 0, 0, 0)
205
206#define LARGEMAP_MIN_ADDRESS KV4ADDR(LMSPML4I, 0, 0, 0)
207#define LARGEMAP_MAX_ADDRESS KV4ADDR(LMEPML4I + 1, 0, 0, 0)
208
209/*
210 * Formally kernel mapping starts at KERNBASE, but kernel linker
211 * script leaves first PDE reserved. For legacy BIOS boot, kernel is
212 * loaded at KERNLOAD = 2M, and initial kernel page table maps
213 * physical memory from zero to KERNend starting at KERNBASE.
214 *
215 * KERNSTART is where the first actual kernel page is mapped, after
216 * the compatibility mapping.
217 */
218#define KERNBASE KV4ADDR(KPML4I, KPDPI, 0, 0)
219#define KERNSTART (KERNBASE + NBPDR)
220
221#define UPT_MAX_ADDRESS KV4ADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
222#define UPT_MIN_ADDRESS KV4ADDR(PML4PML4I, 0, 0, 0)
223
224#define VM_MAXUSER_ADDRESS_LA57 UVADDR(NUPML5E, 0, 0, 0, 0)
225#define VM_MAXUSER_ADDRESS_LA48 UVADDR(0, NUP4ML4E, 0, 0, 0)
226#define VM_MAXUSER_ADDRESS VM_MAXUSER_ADDRESS_LA57
227
228#define SHAREDPAGE_LA57 (VM_MAXUSER_ADDRESS_LA57 - PAGE_SIZE)
229#define SHAREDPAGE_LA48 (VM_MAXUSER_ADDRESS_LA48 - PAGE_SIZE)
230#define USRSTACK_LA57 SHAREDPAGE_LA57
231#define USRSTACK_LA48 SHAREDPAGE_LA48
232#define USRSTACK USRSTACK_LA48
233#define PS_STRINGS_LA57 (USRSTACK_LA57 - sizeof(struct ps_strings))
234#define PS_STRINGS_LA48 (USRSTACK_LA48 - sizeof(struct ps_strings))
235
236#define VM_MAX_ADDRESS UPT_MAX_ADDRESS
237#define VM_MIN_ADDRESS (0)
238
239/*
240 * XXX Allowing dmaplimit == 0 is a temporary workaround for vt(4) efifb's
241 * early use of PHYS_TO_DMAP before the mapping is actually setup. This works
242 * because the result is not actually accessed until later, but the early
243 * vt fb startup needs to be reworked.
244 */
245#define PHYS_IN_DMAP(pa) (dmaplimit == 0 || (pa) < dmaplimit)
246#define VIRT_IN_DMAP(va) ((va) >= DMAP_MIN_ADDRESS && \
247 (va) < (DMAP_MIN_ADDRESS + dmaplimit))
248
249#define PMAP_HAS_DMAP 1
250#define PHYS_TO_DMAP(x) ({ \
251 KASSERT(PHYS_IN_DMAP(x), \
252 ("physical address %#jx not covered by the DMAP", \
253 (uintmax_t)x)); \
254 (x) | DMAP_MIN_ADDRESS; })
255
256#define DMAP_TO_PHYS(x) ({ \
257 KASSERT(VIRT_IN_DMAP(x), \
258 ("virtual address %#jx not covered by the DMAP", \
259 (uintmax_t)x)); \
260 (x) & ~DMAP_MIN_ADDRESS; })
261
262/*
263 * amd64 maps the page array into KVA so that it can be more easily
264 * allocated on the correct memory domains.
265 */
266#define PMAP_HAS_PAGE_ARRAY 1
267
268/*
269 * How many physical pages per kmem arena virtual page.
270 */
271#ifndef VM_KMEM_SIZE_SCALE
272#define VM_KMEM_SIZE_SCALE (1)
273#endif
274
275/*
276 * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
277 * kernel map.
278 */
279#ifndef VM_KMEM_SIZE_MAX
280#define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
281 VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
282#endif
283
284/* initial pagein size of beginning of executable file */
285#ifndef VM_INITIAL_PAGEIN
286#define VM_INITIAL_PAGEIN 16
287#endif
288
289#define ZERO_REGION_SIZE (2 * 1024 * 1024) /* 2MB */
290
291/*
292 * The pmap can create non-transparent large page mappings.
293 */
294#define PMAP_HAS_LARGEPAGES 1
295
296/*
297 * Need a page dump array for minidump.
298 */
299#define MINIDUMP_PAGE_TRACKING 1
300
301#endif /* _MACHINE_VMPARAM_H_ */
302
303#endif /* __i386__ */