1 /*-
2 * SPDX-License-Identifier: BSD-3-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 *
9 * This code is derived from software contributed to Berkeley by
10 * William Jolitz.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
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. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
37 * $FreeBSD$
38 */
39
40 #ifndef _MACHINE_VMPARAM_H_
41 #define _MACHINE_VMPARAM_H_ 1
42
43 /*
44 * Machine dependent constants for 386.
45 */
46
47 /*
48 * Virtual memory related constants, all in bytes
49 */
50 #define MAXTSIZ (128UL*1024*1024) /* max text size */
51 #ifndef DFLDSIZ
52 #define DFLDSIZ (128UL*1024*1024) /* initial data size limit */
53 #endif
54 #ifndef MAXDSIZ
55 #define MAXDSIZ (512UL*1024*1024) /* max data size */
56 #endif
57 #ifndef DFLSSIZ
58 #define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
59 #endif
60 #ifndef MAXSSIZ
61 #define MAXSSIZ (64UL*1024*1024) /* max stack size */
62 #endif
63 #ifndef SGROWSIZ
64 #define SGROWSIZ (128UL*1024) /* amount to grow stack */
65 #endif
66
67 /*
68 * Choose between DENSE and SPARSE based on whether lower execution time or
69 * lower kernel address space consumption is desired. Under PAE, kernel
70 * address space is often in short supply.
71 */
72 #ifdef PAE
73 #define VM_PHYSSEG_SPARSE
74 #else
75 #define VM_PHYSSEG_DENSE
76 #endif
77
78 /*
79 * The number of PHYSSEG entries must be one greater than the number
80 * of phys_avail entries because the phys_avail entry that spans the
81 * largest physical address that is accessible by ISA DMA is split
82 * into two PHYSSEG entries.
83 */
84 #define VM_PHYSSEG_MAX 17
85
86 /*
87 * Create one free page pool. Since the i386 kernel virtual address
88 * space does not include a mapping onto the machine's entire physical
89 * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
90 * pool, VM_FREEPOOL_DEFAULT.
91 */
92 #define VM_NFREEPOOL 1
93 #define VM_FREEPOOL_DEFAULT 0
94 #define VM_FREEPOOL_DIRECT 0
95
96 /*
97 * Create up to three free page lists: VM_FREELIST_DMA32 is for physical pages
98 * that have physical addresses below 4G but are not accessible by ISA DMA,
99 * and VM_FREELIST_ISADMA is for physical pages that are accessible by ISA
100 * DMA.
101 */
102 #define VM_NFREELIST 3
103 #define VM_FREELIST_DEFAULT 0
104 #define VM_FREELIST_DMA32 1
105 #define VM_FREELIST_LOWMEM 2
106
107 #define VM_LOWMEM_BOUNDARY (16 << 20) /* 16MB ISA DMA limit */
108
109 /*
110 * Always create DMA32 freelist if there is any memory above 4G.
111 * Bounce dma is extremely fragile and simultaneously intensively
112 * used.
113 */
114 #define VM_DMA32_NPAGES_THRESHOLD 1
115
116 /*
117 * The largest allocation size is 2MB under PAE and 4MB otherwise.
118 */
119 #define VM_NFREEORDER_PAE 10
120 #define VM_NFREEORDER_NOPAE 11
121 #define VM_NFREEORDER_MAX VM_NFREEORDER_NOPAE
122 #define VM_NFREEORDER i386_pmap_VM_NFREEORDER
123
124 /*
125 * Enable superpage reservations: 1 level.
126 */
127 #ifndef VM_NRESERVLEVEL
128 #define VM_NRESERVLEVEL 1
129 #endif
130
131 /*
132 * Level 0 reservations consist of 512 pages when PAE pagetables are
133 * used, and 1024 pages otherwise.
134 */
135 #ifndef VM_LEVEL_0_ORDER
136 #define VM_LEVEL_0_ORDER_PAE 9
137 #define VM_LEVEL_0_ORDER_NOPAE 10
138 #define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER_NOPAE
139 #define VM_LEVEL_0_ORDER i386_pmap_VM_LEVEL_0_ORDER
140 #else
141 #define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER
142 #endif
143
144 /*
145 * Kernel physical load address.
146 */
147 #ifndef KERNLOAD
148 #define KERNLOAD (8 * 1024 * 1024)
149 #endif /* !defined(KERNLOAD) */
150
151 /*
152 * Virtual addresses of things. Derived from the page directory and
153 * page table indexes from pmap.h for precision.
154 * Because of the page that is both a PD and PT, it looks a little
155 * messy at times, but hey, we'll do anything to save a page :-)
156 */
157
158 #define VM_MAX_KERNEL_ADDRESS (0xffffffffU - 16 * 1024 * 1024 + 1)
159
160 #define VM_MIN_KERNEL_ADDRESS 0
161
162 #define KERNBASE KERNLOAD
163
164 #define UPT_MAX_ADDRESS VADDR(PTDPTDI, PTDPTDI)
165 #define UPT_MIN_ADDRESS VADDR(PTDPTDI, 0)
166
167 #define VM_MAXUSER_ADDRESS (0xffffffff - 4 * 1024 * 1024 + 1)
168
169 #define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
170 #define USRSTACK SHAREDPAGE
171
172 #define VM_MAX_ADDRESS VADDR(PTDPTDI, 0)
173 #define VM_MIN_ADDRESS ((vm_offset_t)0)
174
175 #define PMAP_TRM_MIN_ADDRESS VM_MAXUSER_ADDRESS
176 #define PMAP_TRM_MAX_ADDRESS 0xffffffff
177
178 #define PMAP_MAP_LOW (4 * 1024 * 1024)
179
180 /*
181 * KVA layout. The unit of the system allocation is single PDE, which
182 * represents NBPDR bytes, aligned to NBPDR. NBPDR is 4M for non-PAE
183 * page tables, and 2M for PAE, so PAE mode requires twice as many PTDs
184 * to create the same memory map as non-PAE.
185 *
186 * 0x00000000 - 0x003fffff Transient identity map of low memory (0-4M),
187 * normally disabled to catch NULL derefs.
188 * 0x00400000 - 0x007fffff Fixed mapping of the low memory (4-8M).
189 * 0x00800000 - 0xffbfffff KERNBASE (VA) == KERNLOAD (PA), kernel
190 * text + data and all kernel maps. Managed
191 * by MI VM.
192 * 0xffc00000 - 0xffdfffff Recursive kernel page table mapping, pointed
193 * to by PTmap. PTD[] recursively points
194 * into PTmap.
195 * 0xffe00000 - 0xffffffff Kernel/User mode shared PDE, contains GDT,
196 * IDT, TSS, LDT, trampoline code and stacks.
197 * Managed by pmap_trm_alloc().
198 */
199
200 /*
201 * How many physical pages per kmem arena virtual page.
202 */
203 #ifndef VM_KMEM_SIZE_SCALE
204 #define VM_KMEM_SIZE_SCALE (1)
205 #endif
206
207 /*
208 * Optional floor (in bytes) on the size of the kmem arena.
209 */
210 #ifndef VM_KMEM_SIZE_MIN
211 #define VM_KMEM_SIZE_MIN (12 * 1024 * 1024)
212 #endif
213
214 /*
215 * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
216 * kernel map rounded to the nearest multiple of the superpage size.
217 */
218 #ifndef VM_KMEM_SIZE_MAX
219 #define VM_KMEM_SIZE_MAX (((((VM_MAX_KERNEL_ADDRESS - \
220 VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT)
221 #endif
222
223 /* initial pagein size of beginning of executable file */
224 #ifndef VM_INITIAL_PAGEIN
225 #define VM_INITIAL_PAGEIN 16
226 #endif
227
228 #define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
229
230 #ifndef VM_MAX_AUTOTUNE_MAXUSERS
231 #define VM_MAX_AUTOTUNE_MAXUSERS 384
232 #endif
233
234 #define SFBUF
235 #define SFBUF_MAP
236 #define SFBUF_CPUSET
237 #define SFBUF_PROCESS_PAGE
238
239 #define PMAP_HAS_DMAP 0
240 #define PHYS_TO_DMAP(x) ({ panic("No direct map exists"); 0; })
241 #define DMAP_TO_PHYS(x) ({ panic("No direct map exists"); 0; })
242
243 /*
244 * No non-transparent large page support in the pmap.
245 */
246 #define PMAP_HAS_LARGEPAGES 0
247
248 /*
249 * Need a page dump array for minidump.
250 */
251 #define MINIDUMP_PAGE_TRACKING 1
252
253 #endif /* _MACHINE_VMPARAM_H_ */
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